docs: move ia64 architecture docs under Documentation/arch/

Architecture-specific documentation is being moved into Documentation/arch/
as a way of cleaning up the top-level documentation directory and making
the docs hierarchy more closely match the source hierarchy.  Move
Documentation/ia64 into arch/ and fix all in-tree references.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>

10 files changed, 0 insertions, 2274 deletions

diff --git a/Documentation/ia64/aliasing.rst b/Documentation/ia64/aliasing.rst
deleted file mode 100644
index 36a1e1d4842b..000000000000
--- a/Documentation/ia64/aliasing.rst
+++ /dev/null
@@ -1,246 +0,0 @@
-==================================
-Memory Attribute Aliasing on IA-64
-==================================
-
-Bjorn Helgaas <bjorn.helgaas@hp.com>
-
-May 4, 2006
-
-
-Memory Attributes
-=================
-
-    Itanium supports several attributes for virtual memory references.
-    The attribute is part of the virtual translation, i.e., it is
-    contained in the TLB entry.  The ones of most interest to the Linux
-    kernel are:
-
-	==		======================
-        WB		Write-back (cacheable)
-	UC		Uncacheable
-	WC		Write-coalescing
-	==		======================
-
-    System memory typically uses the WB attribute.  The UC attribute is
-    used for memory-mapped I/O devices.  The WC attribute is uncacheable
-    like UC is, but writes may be delayed and combined to increase
-    performance for things like frame buffers.
-
-    The Itanium architecture requires that we avoid accessing the same
-    page with both a cacheable mapping and an uncacheable mapping[1].
-
-    The design of the chipset determines which attributes are supported
-    on which regions of the address space.  For example, some chipsets
-    support either WB or UC access to main memory, while others support
-    only WB access.
-
-Memory Map
-==========
-
-    Platform firmware describes the physical memory map and the
-    supported attributes for each region.  At boot-time, the kernel uses
-    the EFI GetMemoryMap() interface.  ACPI can also describe memory
-    devices and the attributes they support, but Linux/ia64 currently
-    doesn't use this information.
-
-    The kernel uses the efi_memmap table returned from GetMemoryMap() to
-    learn the attributes supported by each region of physical address
-    space.  Unfortunately, this table does not completely describe the
-    address space because some machines omit some or all of the MMIO
-    regions from the map.
-
-    The kernel maintains another table, kern_memmap, which describes the
-    memory Linux is actually using and the attribute for each region.
-    This contains only system memory; it does not contain MMIO space.
-
-    The kern_memmap table typically contains only a subset of the system
-    memory described by the efi_memmap.  Linux/ia64 can't use all memory
-    in the system because of constraints imposed by the identity mapping
-    scheme.
-
-    The efi_memmap table is preserved unmodified because the original
-    boot-time information is required for kexec.
-
-Kernel Identity Mappings
-========================
-
-    Linux/ia64 identity mappings are done with large pages, currently
-    either 16MB or 64MB, referred to as "granules."  Cacheable mappings
-    are speculative[2], so the processor can read any location in the
-    page at any time, independent of the programmer's intentions.  This
-    means that to avoid attribute aliasing, Linux can create a cacheable
-    identity mapping only when the entire granule supports cacheable
-    access.
-
-    Therefore, kern_memmap contains only full granule-sized regions that
-    can referenced safely by an identity mapping.
-
-    Uncacheable mappings are not speculative, so the processor will
-    generate UC accesses only to locations explicitly referenced by
-    software.  This allows UC identity mappings to cover granules that
-    are only partially populated, or populated with a combination of UC
-    and WB regions.
-
-User Mappings
-=============
-
-    User mappings are typically done with 16K or 64K pages.  The smaller
-    page size allows more flexibility because only 16K or 64K has to be
-    homogeneous with respect to memory attributes.
-
-Potential Attribute Aliasing Cases
-==================================
-
-    There are several ways the kernel creates new mappings:
-
-mmap of /dev/mem
-----------------
-
-	This uses remap_pfn_range(), which creates user mappings.  These
-	mappings may be either WB or UC.  If the region being mapped
-	happens to be in kern_memmap, meaning that it may also be mapped
-	by a kernel identity mapping, the user mapping must use the same
-	attribute as the kernel mapping.
-
-	If the region is not in kern_memmap, the user mapping should use
-	an attribute reported as being supported in the EFI memory map.
-
-	Since the EFI memory map does not describe MMIO on some
-	machines, this should use an uncacheable mapping as a fallback.
-
-mmap of /sys/class/pci_bus/.../legacy_mem
------------------------------------------
-
-	This is very similar to mmap of /dev/mem, except that legacy_mem
-	only allows mmap of the one megabyte "legacy MMIO" area for a
-	specific PCI bus.  Typically this is the first megabyte of
-	physical address space, but it may be different on machines with
-	several VGA devices.
-
-	"X" uses this to access VGA frame buffers.  Using legacy_mem
-	rather than /dev/mem allows multiple instances of X to talk to
-	different VGA cards.
-
-	The /dev/mem mmap constraints apply.
-
-mmap of /proc/bus/pci/.../??.?
-------------------------------
-
-	This is an MMIO mmap of PCI functions, which additionally may or
-	may not be requested as using the WC attribute.
-
-	If WC is requested, and the region in kern_memmap is either WC
-	or UC, and the EFI memory map designates the region as WC, then
-	the WC mapping is allowed.
-
-	Otherwise, the user mapping must use the same attribute as the
-	kernel mapping.
-
-read/write of /dev/mem
-----------------------
-
-	This uses copy_from_user(), which implicitly uses a kernel
-	identity mapping.  This is obviously safe for things in
-	kern_memmap.
-
-	There may be corner cases of things that are not in kern_memmap,
-	but could be accessed this way.  For example, registers in MMIO
-	space are not in kern_memmap, but could be accessed with a UC
-	mapping.  This would not cause attribute aliasing.  But
-	registers typically can be accessed only with four-byte or
-	eight-byte accesses, and the copy_from_user() path doesn't allow
-	any control over the access size, so this would be dangerous.
-
-ioremap()
----------
-
-	This returns a mapping for use inside the kernel.
-
-	If the region is in kern_memmap, we should use the attribute
-	specified there.
-
-	If the EFI memory map reports that the entire granule supports
-	WB, we should use that (granules that are partially reserved
-	or occupied by firmware do not appear in kern_memmap).
-
-	If the granule contains non-WB memory, but we can cover the
-	region safely with kernel page table mappings, we can use
-	ioremap_page_range() as most other architectures do.
-
-	Failing all of the above, we have to fall back to a UC mapping.
-
-Past Problem Cases
-==================
-
-mmap of various MMIO regions from /dev/mem by "X" on Intel platforms
---------------------------------------------------------------------
-
-      The EFI memory map may not report these MMIO regions.
-
-      These must be allowed so that X will work.  This means that
-      when the EFI memory map is incomplete, every /dev/mem mmap must
-      succeed.  It may create either WB or UC user mappings, depending
-      on whether the region is in kern_memmap or the EFI memory map.
-
-mmap of 0x0-0x9FFFF /dev/mem by "hwinfo" on HP sx1000 with VGA enabled
-----------------------------------------------------------------------
-
-      The EFI memory map reports the following attributes:
-
-        =============== ======= ==================
-        0x00000-0x9FFFF WB only
-        0xA0000-0xBFFFF UC only (VGA frame buffer)
-        0xC0000-0xFFFFF WB only
-        =============== ======= ==================
-
-      This mmap is done with user pages, not kernel identity mappings,
-      so it is safe to use WB mappings.
-
-      The kernel VGA driver may ioremap the VGA frame buffer at 0xA0000,
-      which uses a granule-sized UC mapping.  This granule will cover some
-      WB-only memory, but since UC is non-speculative, the processor will
-      never generate an uncacheable reference to the WB-only areas unless
-      the driver explicitly touches them.
-
-mmap of 0x0-0xFFFFF legacy_mem by "X"
--------------------------------------
-
-      If the EFI memory map reports that the entire range supports the
-      same attributes, we can allow the mmap (and we will prefer WB if
-      supported, as is the case with HP sx[12]000 machines with VGA
-      disabled).
-
-      If EFI reports the range as partly WB and partly UC (as on sx[12]000
-      machines with VGA enabled), we must fail the mmap because there's no
-      safe attribute to use.
-
-      If EFI reports some of the range but not all (as on Intel firmware
-      that doesn't report the VGA frame buffer at all), we should fail the
-      mmap and force the user to map just the specific region of interest.
-
-mmap of 0xA0000-0xBFFFF legacy_mem by "X" on HP sx1000 with VGA disabled
-------------------------------------------------------------------------
-
-      The EFI memory map reports the following attributes::
-
-        0x00000-0xFFFFF WB only (no VGA MMIO hole)
-
-      This is a special case of the previous case, and the mmap should
-      fail for the same reason as above.
-
-read of /sys/devices/.../rom
-----------------------------
-
-      For VGA devices, this may cause an ioremap() of 0xC0000.  This
-      used to be done with a UC mapping, because the VGA frame buffer
-      at 0xA0000 prevents use of a WB granule.  The UC mapping causes
-      an MCA on HP sx[12]000 chipsets.
-
-      We should use WB page table mappings to avoid covering the VGA
-      frame buffer.
-
-Notes
-=====
-
-    [1] SDM rev 2.2, vol 2, sec 4.4.1.
-    [2] SDM rev 2.2, vol 2, sec 4.4.6.
diff --git a/Documentation/ia64/efirtc.rst b/Documentation/ia64/efirtc.rst
deleted file mode 100644
index fd8328408301..000000000000
--- a/Documentation/ia64/efirtc.rst
+++ /dev/null
@@ -1,144 +0,0 @@
-==========================
-EFI Real Time Clock driver
-==========================
-
-S. Eranian <eranian@hpl.hp.com>
-
-March 2000
-
-1. Introduction
-===============
-
-This document describes the efirtc.c driver has provided for
-the IA-64 platform.
-
-The purpose of this driver is to supply an API for kernel and user applications
-to get access to the Time Service offered by EFI version 0.92.
-
-EFI provides 4 calls one can make once the OS is booted: GetTime(),
-SetTime(), GetWakeupTime(), SetWakeupTime() which are all supported by this
-driver. We describe those calls as well the design of the driver in the
-following sections.
-
-2. Design Decisions
-===================
-
-The original ideas was to provide a very simple driver to get access to,
-at first, the time of day service. This is required in order to access, in a
-portable way, the CMOS clock. A program like /sbin/hwclock uses such a clock
-to initialize the system view of the time during boot.
-
-Because we wanted to minimize the impact on existing user-level apps using
-the CMOS clock, we decided to expose an API that was very similar to the one
-used today with the legacy RTC driver (driver/char/rtc.c). However, because
-EFI provides a simpler services, not all ioctl() are available. Also
-new ioctl()s have been introduced for things that EFI provides but not the
-legacy.
-
-EFI uses a slightly different way of representing the time, noticeably
-the reference date is different. Year is the using the full 4-digit format.
-The Epoch is January 1st 1998. For backward compatibility reasons we don't
-expose this new way of representing time. Instead we use something very
-similar to the struct tm, i.e. struct rtc_time, as used by hwclock.
-One of the reasons for doing it this way is to allow for EFI to still evolve
-without necessarily impacting any of the user applications. The decoupling
-enables flexibility and permits writing wrapper code is ncase things change.
-
-The driver exposes two interfaces, one via the device file and a set of
-ioctl()s. The other is read-only via the /proc filesystem.
-
-As of today we don't offer a /proc/sys interface.
-
-To allow for a uniform interface between the legacy RTC and EFI time service,
-we have created the include/linux/rtc.h header file to contain only the
-"public" API of the two drivers.  The specifics of the legacy RTC are still
-in include/linux/mc146818rtc.h.
-
-
-3. Time of day service
-======================
-
-The part of the driver gives access to the time of day service of EFI.
-Two ioctl()s, compatible with the legacy RTC calls:
-
-	Read the CMOS clock::
-
-		ioctl(d, RTC_RD_TIME, &rtc);
-
-	Write the CMOS clock::
-
-		ioctl(d, RTC_SET_TIME, &rtc);
-
-The rtc is a pointer to a data structure defined in rtc.h which is close
-to a struct tm::
-
-  struct rtc_time {
-          int tm_sec;
-          int tm_min;
-          int tm_hour;
-          int tm_mday;
-          int tm_mon;
-          int tm_year;
-          int tm_wday;
-          int tm_yday;
-          int tm_isdst;
-  };
-
-The driver takes care of converting back an forth between the EFI time and
-this format.
-
-Those two ioctl()s can be exercised with the hwclock command:
-
-For reading::
-
-	# /sbin/hwclock --show
-	Mon Mar  6 15:32:32 2000  -0.910248 seconds
-
-For setting::
-
-	# /sbin/hwclock --systohc
-
-Root privileges are required to be able to set the time of day.
-
-4. Wakeup Alarm service
-=======================
-
-EFI provides an API by which one can program when a machine should wakeup,
-i.e. reboot. This is very different from the alarm provided by the legacy
-RTC which is some kind of interval timer alarm. For this reason we don't use
-the same ioctl()s to get access to the service. Instead we have
-introduced 2 news ioctl()s to the interface of an RTC.
-
-We have added 2 new ioctl()s that are specific to the EFI driver:
-
-	Read the current state of the alarm::
-
-		ioctl(d, RTC_WKALM_RD, &wkt)
-
-	Set the alarm or change its status::
-
-		ioctl(d, RTC_WKALM_SET, &wkt)
-
-The wkt structure encapsulates a struct rtc_time + 2 extra fields to get
-status information::
-
-  struct rtc_wkalrm {
-
-          unsigned char enabled; /* =1 if alarm is enabled */
-          unsigned char pending; /* =1 if alarm is pending  */
-
-          struct rtc_time time;
-  }
-
-As of today, none of the existing user-level apps supports this feature.
-However writing such a program should be hard by simply using those two
-ioctl().
-
-Root privileges are required to be able to set the alarm.
-
-5. References
-=============
-
-Checkout the following Web site for more information on EFI:
-
-http://developer.intel.com/technology/efi/
diff --git a/Documentation/ia64/err_inject.rst b/Documentation/ia64/err_inject.rst
deleted file mode 100644
index 900f71e93a29..000000000000
--- a/Documentation/ia64/err_inject.rst
+++ /dev/null
@@ -1,1067 +0,0 @@
-========================================
-IPF Machine Check (MC) error inject tool
-========================================
-
-IPF Machine Check (MC) error inject tool is used to inject MC
-errors from Linux. The tool is a test bed for IPF MC work flow including
-hardware correctable error handling, OS recoverable error handling, MC
-event logging, etc.
-
-The tool includes two parts: a kernel driver and a user application
-sample. The driver provides interface to PAL to inject error
-and query error injection capabilities. The driver code is in
-arch/ia64/kernel/err_inject.c. The application sample (shown below)
-provides a combination of various errors and calls the driver's interface
-(sysfs interface) to inject errors or query error injection capabilities.
-
-The tool can be used to test Intel IPF machine MC handling capabilities.
-It's especially useful for people who can not access hardware MC injection
-tool to inject error. It's also very useful to integrate with other
-software test suits to do stressful testing on IPF.
-
-Below is a sample application as part of the whole tool. The sample
-can be used as a working test tool. Or it can be expanded to include
-more features. It also can be a integrated into a library or other user
-application to have more thorough test.
-
-The sample application takes err.conf as error configuration input. GCC
-compiles the code. After you install err_inject driver, you can run
-this sample application to inject errors.
-
-Errata: Itanium 2 Processors Specification Update lists some errata against
-the pal_mc_error_inject PAL procedure. The following err.conf has been tested
-on latest Montecito PAL.
-
-err.conf::
-
-  #This is configuration file for err_inject_tool.
-  #The format of the each line is:
-  #cpu, loop, interval, err_type_info, err_struct_info, err_data_buffer
-  #where
-  #	cpu: logical cpu number the error will be inject in.
-  #	loop: times the error will be injected.
-  #	interval: In second. every so often one error is injected.
-  #	err_type_info, err_struct_info: PAL parameters.
-  #
-  #Note: All values are hex w/o or w/ 0x prefix.
-
-
-  #On cpu2, inject only total 0x10 errors, interval 5 seconds
-  #corrected, data cache, hier-2, physical addr(assigned by tool code).
-  #working on Montecito latest PAL.
-  2, 10, 5, 4101, 95
-
-  #On cpu4, inject and consume total 0x10 errors, interval 5 seconds
-  #corrected, data cache, hier-2, physical addr(assigned by tool code).
-  #working on Montecito latest PAL.
-  4, 10, 5, 4109, 95
-
-  #On cpu15, inject and consume total 0x10 errors, interval 5 seconds
-  #recoverable, DTR0, hier-2.
-  #working on Montecito latest PAL.
-  0xf, 0x10, 5, 4249, 15
-
-The sample application source code:
-
-err_injection_tool.c::
-
-  /*
-   * This program is free software; you can redistribute it and/or modify
-   * it under the terms of the GNU General Public License as published by
-   * the Free Software Foundation; either version 2 of the License, or
-   * (at your option) any later version.
-   *
-   * This program is distributed in the hope that it will be useful, but
-   * WITHOUT ANY WARRANTY; without even the implied warranty of
-   * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
-   * NON INFRINGEMENT.  See the GNU General Public License for more
-   * details.
-   *
-   * You should have received a copy of the GNU General Public License
-   * along with this program; if not, write to the Free Software
-   * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-   *
-   * Copyright (C) 2006 Intel Co
-   *	Fenghua Yu <fenghua.yu@intel.com>
-   *
-   */
-  #include <sys/types.h>
-  #include <sys/stat.h>
-  #include <fcntl.h>
-  #include <stdio.h>
-  #include <sched.h>
-  #include <unistd.h>
-  #include <stdlib.h>
-  #include <stdarg.h>
-  #include <string.h>
-  #include <errno.h>
-  #include <time.h>
-  #include <sys/ipc.h>
-  #include <sys/sem.h>
-  #include <sys/wait.h>
-  #include <sys/mman.h>
-  #include <sys/shm.h>
-
-  #define MAX_FN_SIZE 		256
-  #define MAX_BUF_SIZE 		256
-  #define DATA_BUF_SIZE 		256
-  #define NR_CPUS 		512
-  #define MAX_TASK_NUM		2048
-  #define MIN_INTERVAL		5	// seconds
-  #define	ERR_DATA_BUFFER_SIZE 	3	// Three 8-byte.
-  #define PARA_FIELD_NUM		5
-  #define MASK_SIZE		(NR_CPUS/64)
-  #define PATH_FORMAT "/sys/devices/system/cpu/cpu%d/err_inject/"
-
-  int sched_setaffinity(pid_t pid, unsigned int len, unsigned long *mask);
-
-  int verbose;
-  #define vbprintf if (verbose) printf
-
-  int log_info(int cpu, const char *fmt, ...)
-  {
-	FILE *log;
-	char fn[MAX_FN_SIZE];
-	char buf[MAX_BUF_SIZE];
-	va_list args;
-
-	sprintf(fn, "%d.log", cpu);
-	log=fopen(fn, "a+");
-	if (log==NULL) {
-		perror("Error open:");
-		return -1;
-	}
-
-	va_start(args, fmt);
-	vprintf(fmt, args);
-	memset(buf, 0, MAX_BUF_SIZE);
-	vsprintf(buf, fmt, args);
-	va_end(args);
-
-	fwrite(buf, sizeof(buf), 1, log);
-	fclose(log);
-
-	return 0;
-  }
-
-  typedef unsigned long u64;
-  typedef unsigned int  u32;
-
-  typedef union err_type_info_u {
-	struct {
-		u64	mode		: 3,	/* 0-2 */
-			err_inj		: 3,	/* 3-5 */
-			err_sev		: 2,	/* 6-7 */
-			err_struct	: 5,	/* 8-12 */
-			struct_hier	: 3,	/* 13-15 */
-			reserved	: 48;	/* 16-63 */
-	} err_type_info_u;
-	u64	err_type_info;
-  } err_type_info_t;
-
-  typedef union err_struct_info_u {
-	struct {
-		u64	siv		: 1,	/* 0	 */
-			c_t		: 2,	/* 1-2	 */
-			cl_p		: 3,	/* 3-5	 */
-			cl_id		: 3,	/* 6-8	 */
-			cl_dp		: 1,	/* 9	 */
-			reserved1	: 22,	/* 10-31 */
-			tiv		: 1,	/* 32	 */
-			trigger		: 4,	/* 33-36 */
-			trigger_pl 	: 3,	/* 37-39 */
-			reserved2 	: 24;	/* 40-63 */
-	} err_struct_info_cache;
-	struct {
-		u64	siv		: 1,	/* 0	 */
-			tt		: 2,	/* 1-2	 */
-			tc_tr		: 2,	/* 3-4	 */
-			tr_slot		: 8,	/* 5-12	 */
-			reserved1	: 19,	/* 13-31 */
-			tiv		: 1,	/* 32	 */
-			trigger		: 4,	/* 33-36 */
-			trigger_pl 	: 3,	/* 37-39 */
-			reserved2 	: 24;	/* 40-63 */
-	} err_struct_info_tlb;
-	struct {
-		u64	siv		: 1,	/* 0	 */
-			regfile_id	: 4,	/* 1-4	 */
-			reg_num		: 7,	/* 5-11	 */
-			reserved1	: 20,	/* 12-31 */
-			tiv		: 1,	/* 32	 */
-			trigger		: 4,	/* 33-36 */
-			trigger_pl 	: 3,	/* 37-39 */
-			reserved2 	: 24;	/* 40-63 */
-	} err_struct_info_register;
-	struct {
-		u64	reserved;
-	} err_struct_info_bus_processor_interconnect;
-	u64	err_struct_info;
-  } err_struct_info_t;
-
-  typedef union err_data_buffer_u {
-	struct {
-		u64	trigger_addr;		/* 0-63		*/
-		u64	inj_addr;		/* 64-127 	*/
-		u64	way		: 5,	/* 128-132	*/
-			index		: 20,	/* 133-152	*/
-					: 39;	/* 153-191	*/
-	} err_data_buffer_cache;
-	struct {
-		u64	trigger_addr;		/* 0-63		*/
-		u64	inj_addr;		/* 64-127 	*/
-		u64	way		: 5,	/* 128-132	*/
-			index		: 20,	/* 133-152	*/
-			reserved	: 39;	/* 153-191	*/
-	} err_data_buffer_tlb;
-	struct {
-		u64	trigger_addr;		/* 0-63		*/
-	} err_data_buffer_register;
-	struct {
-		u64	reserved;		/* 0-63		*/
-	} err_data_buffer_bus_processor_interconnect;
-	u64 err_data_buffer[ERR_DATA_BUFFER_SIZE];
-  } err_data_buffer_t;
-
-  typedef union capabilities_u {
-	struct {
-		u64	i		: 1,
-			d		: 1,
-			rv		: 1,
-			tag		: 1,
-			data		: 1,
-			mesi		: 1,
-			dp		: 1,
-			reserved1	: 3,
-			pa		: 1,
-			va		: 1,
-			wi		: 1,
-			reserved2	: 20,
-			trigger		: 1,
-			trigger_pl	: 1,
-			reserved3	: 30;
-	} capabilities_cache;
-	struct {
-		u64	d		: 1,
-			i		: 1,
-			rv		: 1,
-			tc		: 1,
-			tr		: 1,
-			reserved1	: 27,
-			trigger		: 1,
-			trigger_pl	: 1,
-			reserved2	: 30;
-	} capabilities_tlb;
-	struct {
-		u64	gr_b0		: 1,
-			gr_b1		: 1,
-			fr		: 1,
-			br		: 1,
-			pr		: 1,
-			ar		: 1,
-			cr		: 1,
-			rr		: 1,
-			pkr		: 1,
-			dbr		: 1,
-			ibr		: 1,
-			pmc		: 1,
-			pmd		: 1,
-			reserved1	: 3,
-			regnum		: 1,
-			reserved2	: 15,
-			trigger		: 1,
-			trigger_pl	: 1,
-			reserved3	: 30;
-	} capabilities_register;
-	struct {
-		u64	reserved;
-	} capabilities_bus_processor_interconnect;
-  } capabilities_t;
-
-  typedef struct resources_s {
-	u64	ibr0		: 1,
-		ibr2		: 1,
-		ibr4		: 1,
-		ibr6		: 1,
-		dbr0		: 1,
-		dbr2		: 1,
-		dbr4		: 1,
-		dbr6		: 1,
-		reserved	: 48;
-  } resources_t;
-
-
-  long get_page_size(void)
-  {
-	long page_size=sysconf(_SC_PAGESIZE);
-	return page_size;
-  }
-
-  #define PAGE_SIZE (get_page_size()==-1?0x4000:get_page_size())
-  #define SHM_SIZE (2*PAGE_SIZE*NR_CPUS)
-  #define SHM_VA 0x2000000100000000
-
-  int shmid;
-  void *shmaddr;
-
-  int create_shm(void)
-  {
-	key_t key;
-	char fn[MAX_FN_SIZE];
-
-	/* cpu0 is always existing */
-	sprintf(fn, PATH_FORMAT, 0);
-	if ((key = ftok(fn, 's')) == -1) {
-		perror("ftok");
-		return -1;
-	}
-
-	shmid = shmget(key, SHM_SIZE, 0644 | IPC_CREAT);
-	if (shmid == -1) {
-		if (errno==EEXIST) {
-			shmid = shmget(key, SHM_SIZE, 0);
-			if (shmid == -1) {
-				perror("shmget");
-				return -1;
-			}
-		}
-		else {
-			perror("shmget");
-			return -1;
-		}
-	}
-	vbprintf("shmid=%d", shmid);
-
-	/* connect to the segment: */
-	shmaddr = shmat(shmid, (void *)SHM_VA, 0);
-	if (shmaddr == (void*)-1) {
-		perror("shmat");
-		return -1;
-	}
-
-	memset(shmaddr, 0, SHM_SIZE);
-	mlock(shmaddr, SHM_SIZE);
-
-	return 0;
-  }
-
-  int free_shm()
-  {
-	munlock(shmaddr, SHM_SIZE);
-          shmdt(shmaddr);
-	semctl(shmid, 0, IPC_RMID);
-
-	return 0;
-  }
-
-  #ifdef _SEM_SEMUN_UNDEFINED
-  union semun
-  {
-	int val;
-	struct semid_ds *buf;
-	unsigned short int *array;
-	struct seminfo *__buf;
-  };
-  #endif
-
-  u32 mode=1; /* 1: physical mode; 2: virtual mode. */
-  int one_lock=1;
-  key_t key[NR_CPUS];
-  int semid[NR_CPUS];
-
-  int create_sem(int cpu)
-  {
-	union semun arg;
-	char fn[MAX_FN_SIZE];
-	int sid;
-
-	sprintf(fn, PATH_FORMAT, cpu);
-	sprintf(fn, "%s/%s", fn, "err_type_info");
-	if ((key[cpu] = ftok(fn, 'e')) == -1) {
-		perror("ftok");
-		return -1;
-	}
-
-	if (semid[cpu]!=0)
-		return 0;
-
-	/* clear old semaphore */
-	if ((sid = semget(key[cpu], 1, 0)) != -1)
-		semctl(sid, 0, IPC_RMID);
-
-	/* get one semaphore */
-	if ((semid[cpu] = semget(key[cpu], 1, IPC_CREAT | IPC_EXCL)) == -1) {
-		perror("semget");
-		printf("Please remove semaphore with key=0x%lx, then run the tool.\n",
-			(u64)key[cpu]);
-		return -1;
-	}
-
-	vbprintf("semid[%d]=0x%lx, key[%d]=%lx\n",cpu,(u64)semid[cpu],cpu,
-		(u64)key[cpu]);
-	/* initialize the semaphore to 1: */
-	arg.val = 1;
-	if (semctl(semid[cpu], 0, SETVAL, arg) == -1) {
-		perror("semctl");
-		return -1;
-	}
-
-	return 0;
-  }
-
-  static int lock(int cpu)
-  {
-	struct sembuf lock;
-
-	lock.sem_num = cpu;
-	lock.sem_op = 1;
-	semop(semid[cpu], &lock, 1);
-
-          return 0;
-  }
-
-  static int unlock(int cpu)
-  {
-	struct sembuf unlock;
-
-	unlock.sem_num = cpu;
-	unlock.sem_op = -1;
-	semop(semid[cpu], &unlock, 1);
-
-          return 0;
-  }
-
-  void free_sem(int cpu)
-  {
-	semctl(semid[cpu], 0, IPC_RMID);
-  }
-
-  int wr_multi(char *fn, unsigned long *data, int size)
-  {
-	int fd;
-	char buf[MAX_BUF_SIZE];
-	int ret;
-
-	if (size==1)
-		sprintf(buf, "%lx", *data);
-	else if (size==3)
-		sprintf(buf, "%lx,%lx,%lx", data[0], data[1], data[2]);
-	else {
-		fprintf(stderr,"write to file with wrong size!\n");
-		return -1;
-	}
-
-	fd=open(fn, O_RDWR);
-	if (!fd) {
-		perror("Error:");
-		return -1;
-	}
-	ret=write(fd, buf, sizeof(buf));
-	close(fd);
-	return ret;
-  }
-
-  int wr(char *fn, unsigned long data)
-  {
-	return wr_multi(fn, &data, 1);
-  }
-
-  int rd(char *fn, unsigned long *data)
-  {
-	int fd;
-	char buf[MAX_BUF_SIZE];
-
-	fd=open(fn, O_RDONLY);
-	if (fd<0) {
-		perror("Error:");
-		return -1;
-	}
-	read(fd, buf, MAX_BUF_SIZE);
-	*data=strtoul(buf, NULL, 16);
-	close(fd);
-	return 0;
-  }
-
-  int rd_status(char *path, int *status)
-  {
-	char fn[MAX_FN_SIZE];
-	sprintf(fn, "%s/status", path);
-	if (rd(fn, (u64*)status)<0) {
-		perror("status reading error.\n");
-		return -1;
-	}
-
-	return 0;
-  }
-
-  int rd_capabilities(char *path, u64 *capabilities)
-  {
-	char fn[MAX_FN_SIZE];
-	sprintf(fn, "%s/capabilities", path);
-	if (rd(fn, capabilities)<0) {
-		perror("capabilities reading error.\n");
-		return -1;
-	}
-
-	return 0;
-  }
-
-  int rd_all(char *path)
-  {
-	unsigned long err_type_info, err_struct_info, err_data_buffer;
-	int status;
-	unsigned long capabilities, resources;
-	char fn[MAX_FN_SIZE];
-
-	sprintf(fn, "%s/err_type_info", path);
-	if (rd(fn, &err_type_info)<0) {
-		perror("err_type_info reading error.\n");
-		return -1;
-	}
-	printf("err_type_info=%lx\n", err_type_info);
-
-	sprintf(fn, "%s/err_struct_info", path);
-	if (rd(fn, &err_struct_info)<0) {
-		perror("err_struct_info reading error.\n");
-		return -1;
-	}
-	printf("err_struct_info=%lx\n", err_struct_info);
-
-	sprintf(fn, "%s/err_data_buffer", path);
-	if (rd(fn, &err_data_buffer)<0) {
-		perror("err_data_buffer reading error.\n");
-		return -1;
-	}
-	printf("err_data_buffer=%lx\n", err_data_buffer);
-
-	sprintf(fn, "%s/status", path);
-	if (rd("status", (u64*)&status)<0) {
-		perror("status reading error.\n");
-		return -1;
-	}
-	printf("status=%d\n", status);
-
-	sprintf(fn, "%s/capabilities", path);
-	if (rd(fn,&capabilities)<0) {
-		perror("capabilities reading error.\n");
-		return -1;
-	}
-	printf("capabilities=%lx\n", capabilities);
-
-	sprintf(fn, "%s/resources", path);
-	if (rd(fn, &resources)<0) {
-		perror("resources reading error.\n");
-		return -1;
-	}
-	printf("resources=%lx\n", resources);
-
-	return 0;
-  }
-
-  int query_capabilities(char *path, err_type_info_t err_type_info,
-			u64 *capabilities)
-  {
-	char fn[MAX_FN_SIZE];
-	err_struct_info_t err_struct_info;
-	err_data_buffer_t err_data_buffer;
-
-	err_struct_info.err_struct_info=0;
-	memset(err_data_buffer.err_data_buffer, -1, ERR_DATA_BUFFER_SIZE*8);
-
-	sprintf(fn, "%s/err_type_info", path);
-	wr(fn, err_type_info.err_type_info);
-	sprintf(fn, "%s/err_struct_info", path);
-	wr(fn, 0x0);
-	sprintf(fn, "%s/err_data_buffer", path);
-	wr_multi(fn, err_data_buffer.err_data_buffer, ERR_DATA_BUFFER_SIZE);
-
-	// Fire pal_mc_error_inject procedure.
-	sprintf(fn, "%s/call_start", path);
-	wr(fn, mode);
-
-	if (rd_capabilities(path, capabilities)<0)
-		return -1;
-
-	return 0;
-  }
-
-  int query_all_capabilities()
-  {
-	int status;
-	err_type_info_t err_type_info;
-	int err_sev, err_struct, struct_hier;
-	int cap=0;
-	u64 capabilities;
-	char path[MAX_FN_SIZE];
-
-	err_type_info.err_type_info=0;			// Initial
-	err_type_info.err_type_info_u.mode=0;		// Query mode;
-	err_type_info.err_type_info_u.err_inj=0;
-
-	printf("All capabilities implemented in pal_mc_error_inject:\n");
-	sprintf(path, PATH_FORMAT ,0);
-	for (err_sev=0;err_sev<3;err_sev++)
-		for (err_struct=0;err_struct<5;err_struct++)
-			for (struct_hier=0;struct_hier<5;struct_hier++)
-	{
-		status=-1;
-		capabilities=0;
-		err_type_info.err_type_info_u.err_sev=err_sev;
-		err_type_info.err_type_info_u.err_struct=err_struct;
-		err_type_info.err_type_info_u.struct_hier=struct_hier;
-
-		if (query_capabilities(path, err_type_info, &capabilities)<0)
-			continue;
-
-		if (rd_status(path, &status)<0)
-			continue;
-
-		if (status==0) {
-			cap=1;
-			printf("For err_sev=%d, err_struct=%d, struct_hier=%d: ",
-				err_sev, err_struct, struct_hier);
-			printf("capabilities 0x%lx\n", capabilities);
-		}
-	}
-	if (!cap) {
-		printf("No capabilities supported.\n");
-		return 0;
-	}
-
-	return 0;
-  }
-
-  int err_inject(int cpu, char *path, err_type_info_t err_type_info,
-		err_struct_info_t err_struct_info,
-		err_data_buffer_t err_data_buffer)
-  {
-	int status;
-	char fn[MAX_FN_SIZE];
-
-	log_info(cpu, "err_type_info=%lx, err_struct_info=%lx, ",
-		err_type_info.err_type_info,
-		err_struct_info.err_struct_info);
-	log_info(cpu,"err_data_buffer=[%lx,%lx,%lx]\n",
-		err_data_buffer.err_data_buffer[0],
-		err_data_buffer.err_data_buffer[1],
-		err_data_buffer.err_data_buffer[2]);
-	sprintf(fn, "%s/err_type_info", path);
-	wr(fn, err_type_info.err_type_info);
-	sprintf(fn, "%s/err_struct_info", path);
-	wr(fn, err_struct_info.err_struct_info);
-	sprintf(fn, "%s/err_data_buffer", path);
-	wr_multi(fn, err_data_buffer.err_data_buffer, ERR_DATA_BUFFER_SIZE);
-
-	// Fire pal_mc_error_inject procedure.
-	sprintf(fn, "%s/call_start", path);
-	wr(fn,mode);
-
-	if (rd_status(path, &status)<0) {
-		vbprintf("fail: read status\n");
-		return -100;
-	}
-
-	if (status!=0) {
-		log_info(cpu, "fail: status=%d\n", status);
-		return status;
-	}
-
-	return status;
-  }
-
-  static int construct_data_buf(char *path, err_type_info_t err_type_info,
-		err_struct_info_t err_struct_info,
-		err_data_buffer_t *err_data_buffer,
-		void *va1)
-  {
-	char fn[MAX_FN_SIZE];
-	u64 virt_addr=0, phys_addr=0;
-
-	vbprintf("va1=%lx\n", (u64)va1);
-	memset(&err_data_buffer->err_data_buffer_cache, 0, ERR_DATA_BUFFER_SIZE*8);
-
-	switch (err_type_info.err_type_info_u.err_struct) {
-		case 1: // Cache
-			switch (err_struct_info.err_struct_info_cache.cl_id) {
-				case 1: //Virtual addr
-					err_data_buffer->err_data_buffer_cache.inj_addr=(u64)va1;
-					break;
-				case 2: //Phys addr
-					sprintf(fn, "%s/virtual_to_phys", path);
-					virt_addr=(u64)va1;
-					if (wr(fn,virt_addr)<0)
-						return -1;
-					rd(fn, &phys_addr);
-					err_data_buffer->err_data_buffer_cache.inj_addr=phys_addr;
-					break;
-				default:
-					printf("Not supported cl_id\n");
-					break;
-			}
-			break;
-		case 2: //  TLB
-			break;
-		case 3: //  Register file
-			break;
-		case 4: //  Bus/system interconnect
-		default:
-			printf("Not supported err_struct\n");
-			break;
-	}
-
-	return 0;
-  }
-
-  typedef struct {
-	u64 cpu;
-	u64 loop;
-	u64 interval;
-	u64 err_type_info;
-	u64 err_struct_info;
-	u64 err_data_buffer[ERR_DATA_BUFFER_SIZE];
-  } parameters_t;
-
-  parameters_t line_para;
-  int para;
-
-  static int empty_data_buffer(u64 *err_data_buffer)
-  {
-	int empty=1;
-	int i;
-
-	for (i=0;i<ERR_DATA_BUFFER_SIZE; i++)
-	   if (err_data_buffer[i]!=-1)
-		empty=0;
-
-	return empty;
-  }
-
-  int err_inj()
-  {
-	err_type_info_t err_type_info;
-	err_struct_info_t err_struct_info;
-	err_data_buffer_t err_data_buffer;
-	int count;
-	FILE *fp;
-	unsigned long cpu, loop, interval, err_type_info_conf, err_struct_info_conf;
-	u64 err_data_buffer_conf[ERR_DATA_BUFFER_SIZE];
-	int num;
-	int i;
-	char path[MAX_FN_SIZE];
-	parameters_t parameters[MAX_TASK_NUM]={};
-	pid_t child_pid[MAX_TASK_NUM];
-	time_t current_time;
-	int status;
-
-	if (!para) {
-	    fp=fopen("err.conf", "r");
-	    if (fp==NULL) {
-		perror("Error open err.conf");
-		return -1;
-	    }
-
-	    num=0;
-	    while (!feof(fp)) {
-		char buf[256];
-		memset(buf,0,256);
-		fgets(buf, 256, fp);
-		count=sscanf(buf, "%lx, %lx, %lx, %lx, %lx, %lx, %lx, %lx\n",
-				&cpu, &loop, &interval,&err_type_info_conf,
-				&err_struct_info_conf,
-				&err_data_buffer_conf[0],
-				&err_data_buffer_conf[1],
-				&err_data_buffer_conf[2]);
-		if (count!=PARA_FIELD_NUM+3) {
-			err_data_buffer_conf[0]=-1;
-			err_data_buffer_conf[1]=-1;
-			err_data_buffer_conf[2]=-1;
-			count=sscanf(buf, "%lx, %lx, %lx, %lx, %lx\n",
-				&cpu, &loop, &interval,&err_type_info_conf,
-				&err_struct_info_conf);
-			if (count!=PARA_FIELD_NUM)
-				continue;
-		}
-
-		parameters[num].cpu=cpu;
-		parameters[num].loop=loop;
-		parameters[num].interval= interval>MIN_INTERVAL
-					  ?interval:MIN_INTERVAL;
-		parameters[num].err_type_info=err_type_info_conf;
-		parameters[num].err_struct_info=err_struct_info_conf;
-		memcpy(parameters[num++].err_data_buffer,
-			err_data_buffer_conf,ERR_DATA_BUFFER_SIZE*8) ;
-
-		if (num>=MAX_TASK_NUM)
-			break;
-	    }
-	}
-	else {
-		parameters[0].cpu=line_para.cpu;
-		parameters[0].loop=line_para.loop;
-		parameters[0].interval= line_para.interval>MIN_INTERVAL
-					  ?line_para.interval:MIN_INTERVAL;
-		parameters[0].err_type_info=line_para.err_type_info;
-		parameters[0].err_struct_info=line_para.err_struct_info;
-		memcpy(parameters[0].err_data_buffer,
-			line_para.err_data_buffer,ERR_DATA_BUFFER_SIZE*8) ;
-
-		num=1;
-	}
-
-	/* Create semaphore: If one_lock, one semaphore for all processors.
-	   Otherwise, one semaphore for each processor. */
-	if (one_lock) {
-		if (create_sem(0)) {
-			printf("Can not create semaphore...exit\n");
-			free_sem(0);
-			return -1;
-		}
-	}
-	else {
-		for (i=0;i<num;i++) {
-		   if (create_sem(parameters[i].cpu)) {
-			printf("Can not create semaphore for cpu%d...exit\n",i);
-			free_sem(parameters[num].cpu);
-			return -1;
-		   }
-		}
-	}
-
-	/* Create a shm segment which will be used to inject/consume errors on.*/
-	if (create_shm()==-1) {
-		printf("Error to create shm...exit\n");
-		return -1;
-	}
-
-	for (i=0;i<num;i++) {
-		pid_t pid;
-
-		current_time=time(NULL);
-		log_info(parameters[i].cpu, "\nBegine at %s", ctime(&current_time));
-		log_info(parameters[i].cpu, "Configurations:\n");
-		log_info(parameters[i].cpu,"On cpu%ld: loop=%lx, interval=%lx(s)",
-			parameters[i].cpu,
-			parameters[i].loop,
-			parameters[i].interval);
-		log_info(parameters[i].cpu," err_type_info=%lx,err_struct_info=%lx\n",
-			parameters[i].err_type_info,
-			parameters[i].err_struct_info);
-
-		sprintf(path, PATH_FORMAT, (int)parameters[i].cpu);
-		err_type_info.err_type_info=parameters[i].err_type_info;
-		err_struct_info.err_struct_info=parameters[i].err_struct_info;
-		memcpy(err_data_buffer.err_data_buffer,
-			parameters[i].err_data_buffer,
-			ERR_DATA_BUFFER_SIZE*8);
-
-		pid=fork();
-		if (pid==0) {
-			unsigned long mask[MASK_SIZE];
-			int j, k;
-
-			void *va1, *va2;
-
-			/* Allocate two memory areas va1 and va2 in shm */
-			va1=shmaddr+parameters[i].cpu*PAGE_SIZE;
-			va2=shmaddr+parameters[i].cpu*PAGE_SIZE+PAGE_SIZE;
-
-			vbprintf("va1=%lx, va2=%lx\n", (u64)va1, (u64)va2);
-			memset(va1, 0x1, PAGE_SIZE);
-			memset(va2, 0x2, PAGE_SIZE);
-
-			if (empty_data_buffer(err_data_buffer.err_data_buffer))
-				/* If not specified yet, construct data buffer
-				 * with va1
-				 */
-				construct_data_buf(path, err_type_info,
-					err_struct_info, &err_data_buffer,va1);
-
-			for (j=0;j<MASK_SIZE;j++)
-				mask[j]=0;
-
-			cpu=parameters[i].cpu;
-			k = cpu%64;
-			j = cpu/64;
-			mask[j] = 1UL << k;
-
-			if (sched_setaffinity(0, MASK_SIZE*8, mask)==-1) {
-				perror("Error sched_setaffinity:");
-				return -1;
-			}
-
-			for (j=0; j<parameters[i].loop; j++) {
-				log_info(parameters[i].cpu,"Injection ");
-				log_info(parameters[i].cpu,"on cpu%ld: #%d/%ld ",
-
-					parameters[i].cpu,j+1, parameters[i].loop);
-
-				/* Hold the lock */
-				if (one_lock)
-					lock(0);
-				else
-				/* Hold lock on this cpu */
-					lock(parameters[i].cpu);
-
-				if ((status=err_inject(parameters[i].cpu,
-					   path, err_type_info,
-					   err_struct_info, err_data_buffer))
-					   ==0) {
-					/* consume the error for "inject only"*/
-					memcpy(va2, va1, PAGE_SIZE);
-					memcpy(va1, va2, PAGE_SIZE);
-					log_info(parameters[i].cpu,
-						"successful\n");
-				}
-				else {
-					log_info(parameters[i].cpu,"fail:");
-					log_info(parameters[i].cpu,
-						"status=%d\n", status);
-					unlock(parameters[i].cpu);
-					break;
-				}
-				if (one_lock)
-				/* Release the lock */
-					unlock(0);
-				/* Release lock on this cpu */
-				else
-					unlock(parameters[i].cpu);
-
-				if (j < parameters[i].loop-1)
-					sleep(parameters[i].interval);
-			}
-			current_time=time(NULL);
-			log_info(parameters[i].cpu, "Done at %s", ctime(&current_time));
-			return 0;
-		}
-		else if (pid<0) {
-			perror("Error fork:");
-			continue;
-		}
-		child_pid[i]=pid;
-	}
-	for (i=0;i<num;i++)
-		waitpid(child_pid[i], NULL, 0);
-
-	if (one_lock)
-		free_sem(0);
-	else
-		for (i=0;i<num;i++)
-			free_sem(parameters[i].cpu);
-
-	printf("All done.\n");
-
-	return 0;
-  }
-
-  void help()
-  {
-	printf("err_inject_tool:\n");
-	printf("\t-q: query all capabilities. default: off\n");
-	printf("\t-m: procedure mode. 1: physical 2: virtual. default: 1\n");
-	printf("\t-i: inject errors. default: off\n");
-	printf("\t-l: one lock per cpu. default: one lock for all\n");
-	printf("\t-e: error parameters:\n");
-	printf("\t\tcpu,loop,interval,err_type_info,err_struct_info[,err_data_buffer[0],err_data_buffer[1],err_data_buffer[2]]\n");
-	printf("\t\t   cpu: logical cpu number the error will be inject in.\n");
-	printf("\t\t   loop: times the error will be injected.\n");
-	printf("\t\t   interval: In second. every so often one error is injected.\n");
-	printf("\t\t   err_type_info, err_struct_info: PAL parameters.\n");
-	printf("\t\t   err_data_buffer: PAL parameter. Optional. If not present,\n");
-	printf("\t\t                    it's constructed by tool automatically. Be\n");
-	printf("\t\t                    careful to provide err_data_buffer and make\n");
-	printf("\t\t                    sure it's working with the environment.\n");
-	printf("\t    Note:no space between error parameters.\n");
-	printf("\t    default: Take error parameters from err.conf instead of command line.\n");
-	printf("\t-v: verbose. default: off\n");
-	printf("\t-h: help\n\n");
-	printf("The tool will take err.conf file as ");
-	printf("input to inject single or multiple errors ");
-	printf("on one or multiple cpus in parallel.\n");
-  }
-
-  int main(int argc, char **argv)
-  {
-	char c;
-	int do_err_inj=0;
-	int do_query_all=0;
-	int count;
-	u32 m;
-
-	/* Default one lock for all cpu's */
-	one_lock=1;
-	while ((c = getopt(argc, argv, "m:iqvhle:")) != EOF)
-		switch (c) {
-			case 'm':	/* Procedure mode. 1: phys 2: virt */
-				count=sscanf(optarg, "%x", &m);
-				if (count!=1 || (m!=1 && m!=2)) {
-					printf("Wrong mode number.\n");
-					help();
-					return -1;
-				}
-				mode=m;
-				break;
-			case 'i':	/* Inject errors */
-				do_err_inj=1;
-				break;
-			case 'q':	/* Query */
-				do_query_all=1;
-				break;
-			case 'v':	/* Verbose */
-				verbose=1;
-				break;
-			case 'l':	/* One lock per cpu */
-				one_lock=0;
-				break;
-			case 'e':	/* error arguments */
-				/* Take parameters:
-				 * #cpu, loop, interval, err_type_info, err_struct_info[, err_data_buffer]
-				 * err_data_buffer is optional. Recommend not to specify
-				 * err_data_buffer. Better to use tool to generate it.
-				 */
-				count=sscanf(optarg,
-					"%lx, %lx, %lx, %lx, %lx, %lx, %lx, %lx\n",
-					&line_para.cpu,
-					&line_para.loop,
-					&line_para.interval,
-					&line_para.err_type_info,
-					&line_para.err_struct_info,
-					&line_para.err_data_buffer[0],
-					&line_para.err_data_buffer[1],
-					&line_para.err_data_buffer[2]);
-				if (count!=PARA_FIELD_NUM+3) {
-				    line_para.err_data_buffer[0]=-1,
-				    line_para.err_data_buffer[1]=-1,
-				    line_para.err_data_buffer[2]=-1;
-				    count=sscanf(optarg, "%lx, %lx, %lx, %lx, %lx\n",
-						&line_para.cpu,
-						&line_para.loop,
-						&line_para.interval,
-						&line_para.err_type_info,
-						&line_para.err_struct_info);
-				    if (count!=PARA_FIELD_NUM) {
-					printf("Wrong error arguments.\n");
-					help();
-					return -1;
-				    }
-				}
-				para=1;
-				break;
-			continue;
-				break;
-			case 'h':
-				help();
-				return 0;
-			default:
-				break;
-		}
-
-	if (do_query_all)
-		query_all_capabilities();
-	if (do_err_inj)
-		err_inj();
-
-	if (!do_query_all &&  !do_err_inj)
-		help();
-
-	return 0;
-  }
diff --git a/Documentation/ia64/features.rst b/Documentation/ia64/features.rst
deleted file mode 100644
index d7226fdcf5f8..000000000000
--- a/Documentation/ia64/features.rst
+++ /dev/null
@@ -1,3 +0,0 @@
-.. SPDX-License-Identifier: GPL-2.0
-
-.. kernel-feat:: $srctree/Documentation/features ia64
diff --git a/Documentation/ia64/fsys.rst b/Documentation/ia64/fsys.rst
deleted file mode 100644
index a702d2cc94b6..000000000000
--- a/Documentation/ia64/fsys.rst
+++ /dev/null
@@ -1,303 +0,0 @@
-===================================
-Light-weight System Calls for IA-64
-===================================
-
-		        Started: 13-Jan-2003
-
-		    Last update: 27-Sep-2003
-
-	              David Mosberger-Tang
-		      <davidm@hpl.hp.com>
-
-Using the "epc" instruction effectively introduces a new mode of
-execution to the ia64 linux kernel.  We call this mode the
-"fsys-mode".  To recap, the normal states of execution are:
-
-  - kernel mode:
-	Both the register stack and the memory stack have been
-	switched over to kernel memory.  The user-level state is saved
-	in a pt-regs structure at the top of the kernel memory stack.
-
-  - user mode:
-	Both the register stack and the kernel stack are in
-	user memory.  The user-level state is contained in the
-	CPU registers.
-
-  - bank 0 interruption-handling mode:
-	This is the non-interruptible state which all
-	interruption-handlers start execution in.  The user-level
-	state remains in the CPU registers and some kernel state may
-	be stored in bank 0 of registers r16-r31.
-
-In contrast, fsys-mode has the following special properties:
-
-  - execution is at privilege level 0 (most-privileged)
-
-  - CPU registers may contain a mixture of user-level and kernel-level
-    state (it is the responsibility of the kernel to ensure that no
-    security-sensitive kernel-level state is leaked back to
-    user-level)
-
-  - execution is interruptible and preemptible (an fsys-mode handler
-    can disable interrupts and avoid all other interruption-sources
-    to avoid preemption)
-
-  - neither the memory-stack nor the register-stack can be trusted while
-    in fsys-mode (they point to the user-level stacks, which may
-    be invalid, or completely bogus addresses)
-
-In summary, fsys-mode is much more similar to running in user-mode
-than it is to running in kernel-mode.  Of course, given that the
-privilege level is at level 0, this means that fsys-mode requires some
-care (see below).
-
-
-How to tell fsys-mode
-=====================
-
-Linux operates in fsys-mode when (a) the privilege level is 0 (most
-privileged) and (b) the stacks have NOT been switched to kernel memory
-yet.  For convenience, the header file <asm-ia64/ptrace.h> provides
-three macros::
-
-	user_mode(regs)
-	user_stack(task,regs)
-	fsys_mode(task,regs)
-
-The "regs" argument is a pointer to a pt_regs structure.  The "task"
-argument is a pointer to the task structure to which the "regs"
-pointer belongs to.  user_mode() returns TRUE if the CPU state pointed
-to by "regs" was executing in user mode (privilege level 3).
-user_stack() returns TRUE if the state pointed to by "regs" was
-executing on the user-level stack(s).  Finally, fsys_mode() returns
-TRUE if the CPU state pointed to by "regs" was executing in fsys-mode.
-The fsys_mode() macro is equivalent to the expression::
-
-	!user_mode(regs) && user_stack(task,regs)
-
-How to write an fsyscall handler
-================================
-
-The file arch/ia64/kernel/fsys.S contains a table of fsyscall-handlers
-(fsyscall_table).  This table contains one entry for each system call.
-By default, a system call is handled by fsys_fallback_syscall().  This
-routine takes care of entering (full) kernel mode and calling the
-normal Linux system call handler.  For performance-critical system
-calls, it is possible to write a hand-tuned fsyscall_handler.  For
-example, fsys.S contains fsys_getpid(), which is a hand-tuned version
-of the getpid() system call.
-
-The entry and exit-state of an fsyscall handler is as follows:
-
-Machine state on entry to fsyscall handler
-------------------------------------------
-
-  ========= ===============================================================
-  r10	    0
-  r11	    saved ar.pfs (a user-level value)
-  r15	    system call number
-  r16	    "current" task pointer (in normal kernel-mode, this is in r13)
-  r32-r39   system call arguments
-  b6	    return address (a user-level value)
-  ar.pfs    previous frame-state (a user-level value)
-  PSR.be    cleared to zero (i.e., little-endian byte order is in effect)
-  -         all other registers may contain values passed in from user-mode
-  ========= ===============================================================
-
-Required machine state on exit to fsyscall handler
---------------------------------------------------
-
-  ========= ===========================================================
-  r11	    saved ar.pfs (as passed into the fsyscall handler)
-  r15	    system call number (as passed into the fsyscall handler)
-  r32-r39   system call arguments (as passed into the fsyscall handler)
-  b6	    return address (as passed into the fsyscall handler)
-  ar.pfs    previous frame-state (as passed into the fsyscall handler)
-  ========= ===========================================================
-
-Fsyscall handlers can execute with very little overhead, but with that
-speed comes a set of restrictions:
-
- * Fsyscall-handlers MUST check for any pending work in the flags
-   member of the thread-info structure and if any of the
-   TIF_ALLWORK_MASK flags are set, the handler needs to fall back on
-   doing a full system call (by calling fsys_fallback_syscall).
-
- * Fsyscall-handlers MUST preserve incoming arguments (r32-r39, r11,
-   r15, b6, and ar.pfs) because they will be needed in case of a
-   system call restart.  Of course, all "preserved" registers also
-   must be preserved, in accordance to the normal calling conventions.
-
- * Fsyscall-handlers MUST check argument registers for containing a
-   NaT value before using them in any way that could trigger a
-   NaT-consumption fault.  If a system call argument is found to
-   contain a NaT value, an fsyscall-handler may return immediately
-   with r8=EINVAL, r10=-1.
-
- * Fsyscall-handlers MUST NOT use the "alloc" instruction or perform
-   any other operation that would trigger mandatory RSE
-   (register-stack engine) traffic.
-
- * Fsyscall-handlers MUST NOT write to any stacked registers because
-   it is not safe to assume that user-level called a handler with the
-   proper number of arguments.
-
- * Fsyscall-handlers need to be careful when accessing per-CPU variables:
-   unless proper safe-guards are taken (e.g., interruptions are avoided),
-   execution may be pre-empted and resumed on another CPU at any given
-   time.
-
- * Fsyscall-handlers must be careful not to leak sensitive kernel'
-   information back to user-level.  In particular, before returning to
-   user-level, care needs to be taken to clear any scratch registers
-   that could contain sensitive information (note that the current
-   task pointer is not considered sensitive: it's already exposed
-   through ar.k6).
-
- * Fsyscall-handlers MUST NOT access user-memory without first
-   validating access-permission (this can be done typically via
-   probe.r.fault and/or probe.w.fault) and without guarding against
-   memory access exceptions (this can be done with the EX() macros
-   defined by asmmacro.h).
-
-The above restrictions may seem draconian, but remember that it's
-possible to trade off some of the restrictions by paying a slightly
-higher overhead.  For example, if an fsyscall-handler could benefit
-from the shadow register bank, it could temporarily disable PSR.i and
-PSR.ic, switch to bank 0 (bsw.0) and then use the shadow registers as
-needed.  In other words, following the above rules yields extremely
-fast system call execution (while fully preserving system call
-semantics), but there is also a lot of flexibility in handling more
-complicated cases.
-
-Signal handling
-===============
-
-The delivery of (asynchronous) signals must be delayed until fsys-mode
-is exited.  This is accomplished with the help of the lower-privilege
-transfer trap: arch/ia64/kernel/process.c:do_notify_resume_user()
-checks whether the interrupted task was in fsys-mode and, if so, sets
-PSR.lp and returns immediately.  When fsys-mode is exited via the
-"br.ret" instruction that lowers the privilege level, a trap will
-occur.  The trap handler clears PSR.lp again and returns immediately.
-The kernel exit path then checks for and delivers any pending signals.
-
-PSR Handling
-============
-
-The "epc" instruction doesn't change the contents of PSR at all.  This
-is in contrast to a regular interruption, which clears almost all
-bits.  Because of that, some care needs to be taken to ensure things
-work as expected.  The following discussion describes how each PSR bit
-is handled.
-
-======= =======================================================================
-PSR.be	Cleared when entering fsys-mode.  A srlz.d instruction is used
-	to ensure the CPU is in little-endian mode before the first
-	load/store instruction is executed.  PSR.be is normally NOT
-	restored upon return from an fsys-mode handler.  In other
-	words, user-level code must not rely on PSR.be being preserved
-	across a system call.
-PSR.up	Unchanged.
-PSR.ac	Unchanged.
-PSR.mfl Unchanged.  Note: fsys-mode handlers must not write-registers!
-PSR.mfh	Unchanged.  Note: fsys-mode handlers must not write-registers!
-PSR.ic	Unchanged.  Note: fsys-mode handlers can clear the bit, if needed.
-PSR.i	Unchanged.  Note: fsys-mode handlers can clear the bit, if needed.
-PSR.pk	Unchanged.
-PSR.dt	Unchanged.
-PSR.dfl	Unchanged.  Note: fsys-mode handlers must not write-registers!
-PSR.dfh	Unchanged.  Note: fsys-mode handlers must not write-registers!
-PSR.sp	Unchanged.
-PSR.pp	Unchanged.
-PSR.di	Unchanged.
-PSR.si	Unchanged.
-PSR.db	Unchanged.  The kernel prevents user-level from setting a hardware
-	breakpoint that triggers at any privilege level other than
-	3 (user-mode).
-PSR.lp	Unchanged.
-PSR.tb	Lazy redirect.  If a taken-branch trap occurs while in
-	fsys-mode, the trap-handler modifies the saved machine state
-	such that execution resumes in the gate page at
-	syscall_via_break(), with privilege level 3.  Note: the
-	taken branch would occur on the branch invoking the
-	fsyscall-handler, at which point, by definition, a syscall
-	restart is still safe.  If the system call number is invalid,
-	the fsys-mode handler will return directly to user-level.  This
-	return will trigger a taken-branch trap, but since the trap is
-	taken _after_ restoring the privilege level, the CPU has already
-	left fsys-mode, so no special treatment is needed.
-PSR.rt	Unchanged.
-PSR.cpl	Cleared to 0.
-PSR.is	Unchanged (guaranteed to be 0 on entry to the gate page).
-PSR.mc	Unchanged.
-PSR.it	Unchanged (guaranteed to be 1).
-PSR.id	Unchanged.  Note: the ia64 linux kernel never sets this bit.
-PSR.da	Unchanged.  Note: the ia64 linux kernel never sets this bit.
-PSR.dd	Unchanged.  Note: the ia64 linux kernel never sets this bit.
-PSR.ss	Lazy redirect.  If set, "epc" will cause a Single Step Trap to
-	be taken.  The trap handler then modifies the saved machine
-	state such that execution resumes in the gate page at
-	syscall_via_break(), with privilege level 3.
-PSR.ri	Unchanged.
-PSR.ed	Unchanged.  Note: This bit could only have an effect if an fsys-mode
-	handler performed a speculative load that gets NaTted.  If so, this
-	would be the normal & expected behavior, so no special treatment is
-	needed.
-PSR.bn	Unchanged.  Note: fsys-mode handlers may clear the bit, if needed.
-	Doing so requires clearing PSR.i and PSR.ic as well.
-PSR.ia	Unchanged.  Note: the ia64 linux kernel never sets this bit.
-======= =======================================================================
-
-Using fast system calls
-=======================
-
-To use fast system calls, userspace applications need simply call
-__kernel_syscall_via_epc().  For example
-
--- example fgettimeofday() call --
-
--- fgettimeofday.S --
-
-::
-
-  #include <asm/asmmacro.h>
-
-  GLOBAL_ENTRY(fgettimeofday)
-  .prologue
-  .save ar.pfs, r11
-  mov r11 = ar.pfs
-  .body
-
-  mov r2 = 0xa000000000020660;;  // gate address
-			       // found by inspection of System.map for the
-			       // __kernel_syscall_via_epc() function.  See
-			       // below for how to do this for real.
-
-  mov b7 = r2
-  mov r15 = 1087		       // gettimeofday syscall
-  ;;
-  br.call.sptk.many b6 = b7
-  ;;
-
-  .restore sp
-
-  mov ar.pfs = r11
-  br.ret.sptk.many rp;;	      // return to caller
-  END(fgettimeofday)
-
--- end fgettimeofday.S --
-
-In reality, getting the gate address is accomplished by two extra
-values passed via the ELF auxiliary vector (include/asm-ia64/elf.h)
-
- * AT_SYSINFO : is the address of __kernel_syscall_via_epc()
- * AT_SYSINFO_EHDR : is the address of the kernel gate ELF DSO
-
-The ELF DSO is a pre-linked library that is mapped in by the kernel at
-the gate page.  It is a proper ELF shared object so, with a dynamic
-loader that recognises the library, you should be able to make calls to
-the exported functions within it as with any other shared library.
-AT_SYSINFO points into the kernel DSO at the
-__kernel_syscall_via_epc() function for historical reasons (it was
-used before the kernel DSO) and as a convenience.
diff --git a/Documentation/ia64/ia64.rst b/Documentation/ia64/ia64.rst
deleted file mode 100644
index b725019a9492..000000000000
--- a/Documentation/ia64/ia64.rst
+++ /dev/null
@@ -1,49 +0,0 @@
-===========================================
-Linux kernel release for the IA-64 Platform
-===========================================
-
-   These are the release notes for Linux since version 2.4 for IA-64
-   platform.  This document provides information specific to IA-64
-   ONLY, to get additional information about the Linux kernel also
-   read the original Linux README provided with the kernel.
-
-Installing the Kernel
-=====================
-
- - IA-64 kernel installation is the same as the other platforms, see
-   original README for details.
-
-
-Software Requirements
-=====================
-
-   Compiling and running this kernel requires an IA-64 compliant GCC
-   compiler.  And various software packages also compiled with an
-   IA-64 compliant GCC compiler.
-
-
-Configuring the Kernel
-======================
-
-   Configuration is the same, see original README for details.
-
-
-Compiling the Kernel:
-
- - Compiling this kernel doesn't differ from other platform so read
-   the original README for details BUT make sure you have an IA-64
-   compliant GCC compiler.
-
-IA-64 Specifics
-===============
-
- - General issues:
-
-    * Hardly any performance tuning has been done. Obvious targets
-      include the library routines (IP checksum, etc.). Less
-      obvious targets include making sure we don't flush the TLB
-      needlessly, etc.
-
-    * SMP locks cleanup/optimization
-
-    * IA32 support.  Currently experimental.  It mostly works.
diff --git a/Documentation/ia64/index.rst b/Documentation/ia64/index.rst
deleted file mode 100644
index 761f2154dfa2..000000000000
--- a/Documentation/ia64/index.rst
+++ /dev/null
@@ -1,19 +0,0 @@
-.. SPDX-License-Identifier: GPL-2.0
-
-==================
-IA-64 Architecture
-==================
-
-.. toctree::
-   :maxdepth: 1
-
-   ia64
-   aliasing
-   efirtc
-   err_inject
-   fsys
-   irq-redir
-   mca
-   serial
-
-   features
diff --git a/Documentation/ia64/irq-redir.rst b/Documentation/ia64/irq-redir.rst
deleted file mode 100644
index 6bbbbe4f73ef..000000000000
--- a/Documentation/ia64/irq-redir.rst
+++ /dev/null
@@ -1,80 +0,0 @@
-==============================
-IRQ affinity on IA64 platforms
-==============================
-
-07.01.2002, Erich Focht <efocht@ess.nec.de>
-
-
-By writing to /proc/irq/IRQ#/smp_affinity the interrupt routing can be
-controlled. The behavior on IA64 platforms is slightly different from
-that described in Documentation/core-api/irq/irq-affinity.rst for i386 systems.
-
-Because of the usage of SAPIC mode and physical destination mode the
-IRQ target is one particular CPU and cannot be a mask of several
-CPUs. Only the first non-zero bit is taken into account.
-
-
-Usage examples
-==============
-
-The target CPU has to be specified as a hexadecimal CPU mask. The
-first non-zero bit is the selected CPU. This format has been kept for
-compatibility reasons with i386.
-
-Set the delivery mode of interrupt 41 to fixed and route the
-interrupts to CPU #3 (logical CPU number) (2^3=0x08)::
-
-     echo "8" >/proc/irq/41/smp_affinity
-
-Set the default route for IRQ number 41 to CPU 6 in lowest priority
-delivery mode (redirectable)::
-
-     echo "r 40" >/proc/irq/41/smp_affinity
-
-The output of the command::
-
-     cat /proc/irq/IRQ#/smp_affinity
-
-gives the target CPU mask for the specified interrupt vector. If the CPU
-mask is preceded by the character "r", the interrupt is redirectable
-(i.e. lowest priority mode routing is used), otherwise its route is
-fixed.
-
-
-
-Initialization and default behavior
-===================================
-
-If the platform features IRQ redirection (info provided by SAL) all
-IO-SAPIC interrupts are initialized with CPU#0 as their default target
-and the routing is the so called "lowest priority mode" (actually
-fixed SAPIC mode with hint). The XTP chipset registers are used as hints
-for the IRQ routing. Currently in Linux XTP registers can have three
-values:
-
-	- minimal for an idle task,
-	- normal if any other task runs,
-	- maximal if the CPU is going to be switched off.
-
-The IRQ is routed to the CPU with lowest XTP register value, the
-search begins at the default CPU. Therefore most of the interrupts
-will be handled by CPU #0.
-
-If the platform doesn't feature interrupt redirection IOSAPIC fixed
-routing is used. The target CPUs are distributed in a round robin
-manner. IRQs will be routed only to the selected target CPUs. Check
-with::
-
-        cat /proc/interrupts
-
-
-
-Comments
-========
-
-On large (multi-node) systems it is recommended to route the IRQs to
-the node to which the corresponding device is connected.
-For systems like the NEC AzusA we get IRQ node-affinity for free. This
-is because usually the chipsets on each node redirect the interrupts
-only to their own CPUs (as they cannot see the XTP registers on the
-other nodes).
diff --git a/Documentation/ia64/mca.rst b/Documentation/ia64/mca.rst
deleted file mode 100644
index 08270bba44a4..000000000000
--- a/Documentation/ia64/mca.rst
+++ /dev/null
@@ -1,198 +0,0 @@
-=============================================================
-An ad-hoc collection of notes on IA64 MCA and INIT processing
-=============================================================
-
-Feel free to update it with notes about any area that is not clear.
-
----
-
-MCA/INIT are completely asynchronous.  They can occur at any time, when
-the OS is in any state.  Including when one of the cpus is already
-holding a spinlock.  Trying to get any lock from MCA/INIT state is
-asking for deadlock.  Also the state of structures that are protected
-by locks is indeterminate, including linked lists.
-
----
-
-The complicated ia64 MCA process.  All of this is mandated by Intel's
-specification for ia64 SAL, error recovery and unwind, it is not as
-if we have a choice here.
-
-* MCA occurs on one cpu, usually due to a double bit memory error.
-  This is the monarch cpu.
-
-* SAL sends an MCA rendezvous interrupt (which is a normal interrupt)
-  to all the other cpus, the slaves.
-
-* Slave cpus that receive the MCA interrupt call down into SAL, they
-  end up spinning disabled while the MCA is being serviced.
-
-* If any slave cpu was already spinning disabled when the MCA occurred
-  then it cannot service the MCA interrupt.  SAL waits ~20 seconds then
-  sends an unmaskable INIT event to the slave cpus that have not
-  already rendezvoused.
-
-* Because MCA/INIT can be delivered at any time, including when the cpu
-  is down in PAL in physical mode, the registers at the time of the
-  event are _completely_ undefined.  In particular the MCA/INIT
-  handlers cannot rely on the thread pointer, PAL physical mode can
-  (and does) modify TP.  It is allowed to do that as long as it resets
-  TP on return.  However MCA/INIT events expose us to these PAL
-  internal TP changes.  Hence curr_task().
-
-* If an MCA/INIT event occurs while the kernel was running (not user
-  space) and the kernel has called PAL then the MCA/INIT handler cannot
-  assume that the kernel stack is in a fit state to be used.  Mainly
-  because PAL may or may not maintain the stack pointer internally.
-  Because the MCA/INIT handlers cannot trust the kernel stack, they
-  have to use their own, per-cpu stacks.  The MCA/INIT stacks are
-  preformatted with just enough task state to let the relevant handlers
-  do their job.
-
-* Unlike most other architectures, the ia64 struct task is embedded in
-  the kernel stack[1].  So switching to a new kernel stack means that
-  we switch to a new task as well.  Because various bits of the kernel
-  assume that current points into the struct task, switching to a new
-  stack also means a new value for current.
-
-* Once all slaves have rendezvoused and are spinning disabled, the
-  monarch is entered.  The monarch now tries to diagnose the problem
-  and decide if it can recover or not.
-
-* Part of the monarch's job is to look at the state of all the other
-  tasks.  The only way to do that on ia64 is to call the unwinder,
-  as mandated by Intel.
-
-* The starting point for the unwind depends on whether a task is
-  running or not.  That is, whether it is on a cpu or is blocked.  The
-  monarch has to determine whether or not a task is on a cpu before it
-  knows how to start unwinding it.  The tasks that received an MCA or
-  INIT event are no longer running, they have been converted to blocked
-  tasks.  But (and its a big but), the cpus that received the MCA
-  rendezvous interrupt are still running on their normal kernel stacks!
-
-* To distinguish between these two cases, the monarch must know which
-  tasks are on a cpu and which are not.  Hence each slave cpu that
-  switches to an MCA/INIT stack, registers its new stack using
-  set_curr_task(), so the monarch can tell that the _original_ task is
-  no longer running on that cpu.  That gives us a decent chance of
-  getting a valid backtrace of the _original_ task.
-
-* MCA/INIT can be nested, to a depth of 2 on any cpu.  In the case of a
-  nested error, we want diagnostics on the MCA/INIT handler that
-  failed, not on the task that was originally running.  Again this
-  requires set_curr_task() so the MCA/INIT handlers can register their
-  own stack as running on that cpu.  Then a recursive error gets a
-  trace of the failing handler's "task".
-
-[1]
-    My (Keith Owens) original design called for ia64 to separate its
-    struct task and the kernel stacks.  Then the MCA/INIT data would be
-    chained stacks like i386 interrupt stacks.  But that required
-    radical surgery on the rest of ia64, plus extra hard wired TLB
-    entries with its associated performance degradation.  David
-    Mosberger vetoed that approach.  Which meant that separate kernel
-    stacks meant separate "tasks" for the MCA/INIT handlers.
-
----
-
-INIT is less complicated than MCA.  Pressing the nmi button or using
-the equivalent command on the management console sends INIT to all
-cpus.  SAL picks one of the cpus as the monarch and the rest are
-slaves.  All the OS INIT handlers are entered at approximately the same
-time.  The OS monarch prints the state of all tasks and returns, after
-which the slaves return and the system resumes.
-
-At least that is what is supposed to happen.  Alas there are broken
-versions of SAL out there.  Some drive all the cpus as monarchs.  Some
-drive them all as slaves.  Some drive one cpu as monarch, wait for that
-cpu to return from the OS then drive the rest as slaves.  Some versions
-of SAL cannot even cope with returning from the OS, they spin inside
-SAL on resume.  The OS INIT code has workarounds for some of these
-broken SAL symptoms, but some simply cannot be fixed from the OS side.
-
----
-
-The scheduler hooks used by ia64 (curr_task, set_curr_task) are layer
-violations.  Unfortunately MCA/INIT start off as massive layer
-violations (can occur at _any_ time) and they build from there.
-
-At least ia64 makes an attempt at recovering from hardware errors, but
-it is a difficult problem because of the asynchronous nature of these
-errors.  When processing an unmaskable interrupt we sometimes need
-special code to cope with our inability to take any locks.
-
----
-
-How is ia64 MCA/INIT different from x86 NMI?
-
-* x86 NMI typically gets delivered to one cpu.  MCA/INIT gets sent to
-  all cpus.
-
-* x86 NMI cannot be nested.  MCA/INIT can be nested, to a depth of 2
-  per cpu.
-
-* x86 has a separate struct task which points to one of multiple kernel
-  stacks.  ia64 has the struct task embedded in the single kernel
-  stack, so switching stack means switching task.
-
-* x86 does not call the BIOS so the NMI handler does not have to worry
-  about any registers having changed.  MCA/INIT can occur while the cpu
-  is in PAL in physical mode, with undefined registers and an undefined
-  kernel stack.
-
-* i386 backtrace is not very sensitive to whether a process is running
-  or not.  ia64 unwind is very, very sensitive to whether a process is
-  running or not.
-
----
-
-What happens when MCA/INIT is delivered what a cpu is running user
-space code?
-
-The user mode registers are stored in the RSE area of the MCA/INIT on
-entry to the OS and are restored from there on return to SAL, so user
-mode registers are preserved across a recoverable MCA/INIT.  Since the
-OS has no idea what unwind data is available for the user space stack,
-MCA/INIT never tries to backtrace user space.  Which means that the OS
-does not bother making the user space process look like a blocked task,
-i.e. the OS does not copy pt_regs and switch_stack to the user space
-stack.  Also the OS has no idea how big the user space RSE and memory
-stacks are, which makes it too risky to copy the saved state to a user
-mode stack.
-
----
-
-How do we get a backtrace on the tasks that were running when MCA/INIT
-was delivered?
-
-mca.c:::ia64_mca_modify_original_stack().  That identifies and
-verifies the original kernel stack, copies the dirty registers from
-the MCA/INIT stack's RSE to the original stack's RSE, copies the
-skeleton struct pt_regs and switch_stack to the original stack, fills
-in the skeleton structures from the PAL minstate area and updates the
-original stack's thread.ksp.  That makes the original stack look
-exactly like any other blocked task, i.e. it now appears to be
-sleeping.  To get a backtrace, just start with thread.ksp for the
-original task and unwind like any other sleeping task.
-
----
-
-How do we identify the tasks that were running when MCA/INIT was
-delivered?
-
-If the previous task has been verified and converted to a blocked
-state, then sos->prev_task on the MCA/INIT stack is updated to point to
-the previous task.  You can look at that field in dumps or debuggers.
-To help distinguish between the handler and the original tasks,
-handlers have _TIF_MCA_INIT set in thread_info.flags.
-
-The sos data is always in the MCA/INIT handler stack, at offset
-MCA_SOS_OFFSET.  You can get that value from mca_asm.h or calculate it
-as KERNEL_STACK_SIZE - sizeof(struct pt_regs) - sizeof(struct
-ia64_sal_os_state), with 16 byte alignment for all structures.
-
-Also the comm field of the MCA/INIT task is modified to include the pid
-of the original task, for humans to use.  For example, a comm field of
-'MCA 12159' means that pid 12159 was running when the MCA was
-delivered.
diff --git a/Documentation/ia64/serial.rst b/Documentation/ia64/serial.rst
deleted file mode 100644
index 1de70c305a79..000000000000
--- a/Documentation/ia64/serial.rst
+++ /dev/null
@@ -1,165 +0,0 @@
-==============
-Serial Devices
-==============
-
-Serial Device Naming
-====================
-
-    As of 2.6.10, serial devices on ia64 are named based on the
-    order of ACPI and PCI enumeration.  The first device in the
-    ACPI namespace (if any) becomes /dev/ttyS0, the second becomes
-    /dev/ttyS1, etc., and PCI devices are named sequentially
-    starting after the ACPI devices.
-
-    Prior to 2.6.10, there were confusing exceptions to this:
-
-	- Firmware on some machines (mostly from HP) provides an HCDP
-	  table[1] that tells the kernel about devices that can be used
-	  as a serial console.  If the user specified "console=ttyS0"
-	  or the EFI ConOut path contained only UART devices, the
-	  kernel registered the device described by the HCDP as
-	  /dev/ttyS0.
-
-	- If there was no HCDP, we assumed there were UARTs at the
-	  legacy COM port addresses (I/O ports 0x3f8 and 0x2f8), so
-	  the kernel registered those as /dev/ttyS0 and /dev/ttyS1.
-
-    Any additional ACPI or PCI devices were registered sequentially
-    after /dev/ttyS0 as they were discovered.
-
-    With an HCDP, device names changed depending on EFI configuration
-    and "console=" arguments.  Without an HCDP, device names didn't
-    change, but we registered devices that might not really exist.
-
-    For example, an HP rx1600 with a single built-in serial port
-    (described in the ACPI namespace) plus an MP[2] (a PCI device) has
-    these ports:
-
-      ==========  ==========     ============    ============   =======
-      Type        MMIO           pre-2.6.10      pre-2.6.10     2.6.10+
-		  address
-				 (EFI console    (EFI console
-                                 on builtin)     on MP port)
-      ==========  ==========     ============    ============   =======
-      builtin     0xff5e0000        ttyS0           ttyS1         ttyS0
-      MP UPS      0xf8031000        ttyS1           ttyS2         ttyS1
-      MP Console  0xf8030000        ttyS2           ttyS0         ttyS2
-      MP 2        0xf8030010        ttyS3           ttyS3         ttyS3
-      MP 3        0xf8030038        ttyS4           ttyS4         ttyS4
-      ==========  ==========     ============    ============   =======
-
-Console Selection
-=================
-
-    EFI knows what your console devices are, but it doesn't tell the
-    kernel quite enough to actually locate them.  The DIG64 HCDP
-    table[1] does tell the kernel where potential serial console
-    devices are, but not all firmware supplies it.  Also, EFI supports
-    multiple simultaneous consoles and doesn't tell the kernel which
-    should be the "primary" one.
-
-    So how do you tell Linux which console device to use?
-
-	- If your firmware supplies the HCDP, it is simplest to
-	  configure EFI with a single device (either a UART or a VGA
-	  card) as the console.  Then you don't need to tell Linux
-	  anything; the kernel will automatically use the EFI console.
-
-	  (This works only in 2.6.6 or later; prior to that you had
-	  to specify "console=ttyS0" to get a serial console.)
-
-	- Without an HCDP, Linux defaults to a VGA console unless you
-	  specify a "console=" argument.
-
-    NOTE: Don't assume that a serial console device will be /dev/ttyS0.
-    It might be ttyS1, ttyS2, etc.  Make sure you have the appropriate
-    entries in /etc/inittab (for getty) and /etc/securetty (to allow
-    root login).
-
-Early Serial Console
-====================
-
-    The kernel can't start using a serial console until it knows where
-    the device lives.  Normally this happens when the driver enumerates
-    all the serial devices, which can happen a minute or more after the
-    kernel starts booting.
-
-    2.6.10 and later kernels have an "early uart" driver that works
-    very early in the boot process.  The kernel will automatically use
-    this if the user supplies an argument like "console=uart,io,0x3f8",
-    or if the EFI console path contains only a UART device and the
-    firmware supplies an HCDP.
-
-Troubleshooting Serial Console Problems
-=======================================
-
-    No kernel output after elilo prints "Uncompressing Linux... done":
-
-	- You specified "console=ttyS0" but Linux changed the device
-	  to which ttyS0 refers.  Configure exactly one EFI console
-	  device[3] and remove the "console=" option.
-
-	- The EFI console path contains both a VGA device and a UART.
-	  EFI and elilo use both, but Linux defaults to VGA.  Remove
-	  the VGA device from the EFI console path[3].
-
-	- Multiple UARTs selected as EFI console devices.  EFI and
-	  elilo use all selected devices, but Linux uses only one.
-	  Make sure only one UART is selected in the EFI console
-	  path[3].
-
-	- You're connected to an HP MP port[2] but have a non-MP UART
-	  selected as EFI console device.  EFI uses the MP as a
-	  console device even when it isn't explicitly selected.
-	  Either move the console cable to the non-MP UART, or change
-	  the EFI console path[3] to the MP UART.
-
-    Long pause (60+ seconds) between "Uncompressing Linux... done" and
-    start of kernel output:
-
-	- No early console because you used "console=ttyS<n>".  Remove
-	  the "console=" option if your firmware supplies an HCDP.
-
-	- If you don't have an HCDP, the kernel doesn't know where
-	  your console lives until the driver discovers serial
-	  devices.  Use "console=uart,io,0x3f8" (or appropriate
-	  address for your machine).
-
-    Kernel and init script output works fine, but no "login:" prompt:
-
-	- Add getty entry to /etc/inittab for console tty.  Look for
-	  the "Adding console on ttyS<n>" message that tells you which
-	  device is the console.
-
-    "login:" prompt, but can't login as root:
-
-	- Add entry to /etc/securetty for console tty.
-
-    No ACPI serial devices found in 2.6.17 or later:
-
-	- Turn on CONFIG_PNP and CONFIG_PNPACPI.  Prior to 2.6.17, ACPI
-	  serial devices were discovered by 8250_acpi.  In 2.6.17,
-	  8250_acpi was replaced by the combination of 8250_pnp and
-	  CONFIG_PNPACPI.
-
-
-
-[1]
-    http://www.dig64.org/specifications/agreement
-    The table was originally defined as the "HCDP" for "Headless
-    Console/Debug Port."  The current version is the "PCDP" for
-    "Primary Console and Debug Port Devices."
-
-[2]
-    The HP MP (management processor) is a PCI device that provides
-    several UARTs.  One of the UARTs is often used as a console; the
-    EFI Boot Manager identifies it as "Acpi(HWP0002,700)/Pci(...)/Uart".
-    The external connection is usually a 25-pin connector, and a
-    special dongle converts that to three 9-pin connectors, one of
-    which is labelled "Console."
-
-[3]
-    EFI console devices are configured using the EFI Boot Manager
-    "Boot option maintenance" menu.  You may have to interrupt the
-    boot sequence to use this menu, and you will have to reset the
-    box after changing console configuration.