Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 438 insertions, 0 deletions

diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h
new file mode 100644
index 000000000000..888fd8908467
--- /dev/null
+++ b/include/asm-mips/system.h
@@ -0,0 +1,438 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle
+ * Copyright (C) 1996 by Paul M. Antoine
+ * Copyright (C) 1999 Silicon Graphics
+ * Kevin D. Kissell, kevink@mips.org and Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 2000 MIPS Technologies, Inc.
+ */
+#ifndef _ASM_SYSTEM_H
+#define _ASM_SYSTEM_H
+
+#include <linux/config.h>
+#include <linux/types.h>
+
+#include <asm/addrspace.h>
+#include <asm/cpu-features.h>
+#include <asm/ptrace.h>
+#include <asm/war.h>
+#include <asm/interrupt.h>
+
+/*
+ * read_barrier_depends - Flush all pending reads that subsequents reads
+ * depend on.
+ *
+ * No data-dependent reads from memory-like regions are ever reordered
+ * over this barrier.  All reads preceding this primitive are guaranteed
+ * to access memory (but not necessarily other CPUs' caches) before any
+ * reads following this primitive that depend on the data return by
+ * any of the preceding reads.  This primitive is much lighter weight than
+ * rmb() on most CPUs, and is never heavier weight than is
+ * rmb().
+ *
+ * These ordering constraints are respected by both the local CPU
+ * and the compiler.
+ *
+ * Ordering is not guaranteed by anything other than these primitives,
+ * not even by data dependencies.  See the documentation for
+ * memory_barrier() for examples and URLs to more information.
+ *
+ * For example, the following code would force ordering (the initial
+ * value of "a" is zero, "b" is one, and "p" is "&a"):
+ *
+ * <programlisting>
+ *	CPU 0				CPU 1
+ *
+ *	b = 2;
+ *	memory_barrier();
+ *	p = &b;				q = p;
+ *					read_barrier_depends();
+ *					d = *q;
+ * </programlisting>
+ *
+ * because the read of "*q" depends on the read of "p" and these
+ * two reads are separated by a read_barrier_depends().  However,
+ * the following code, with the same initial values for "a" and "b":
+ *
+ * <programlisting>
+ *	CPU 0				CPU 1
+ *
+ *	a = 2;
+ *	memory_barrier();
+ *	b = 3;				y = b;
+ *					read_barrier_depends();
+ *					x = a;
+ * </programlisting>
+ *
+ * does not enforce ordering, since there is no data dependency between
+ * the read of "a" and the read of "b".  Therefore, on some CPUs, such
+ * as Alpha, "y" could be set to 3 and "x" to 0.  Use rmb()
+ * in cases like thiswhere there are no data dependencies.
+ */
+
+#define read_barrier_depends()	do { } while(0)
+
+#ifdef CONFIG_CPU_HAS_SYNC
+#define __sync()				\
+	__asm__ __volatile__(			\
+		".set	push\n\t"		\
+		".set	noreorder\n\t"		\
+		".set	mips2\n\t"		\
+		"sync\n\t"			\
+		".set	pop"			\
+		: /* no output */		\
+		: /* no input */		\
+		: "memory")
+#else
+#define __sync()	do { } while(0)
+#endif
+
+#define __fast_iob()				\
+	__asm__ __volatile__(			\
+		".set	push\n\t"		\
+		".set	noreorder\n\t"		\
+		"lw	$0,%0\n\t"		\
+		"nop\n\t"			\
+		".set	pop"			\
+		: /* no output */		\
+		: "m" (*(int *)CKSEG1)		\
+		: "memory")
+
+#define fast_wmb()	__sync()
+#define fast_rmb()	__sync()
+#define fast_mb()	__sync()
+#define fast_iob()				\
+	do {					\
+		__sync();			\
+		__fast_iob();			\
+	} while (0)
+
+#ifdef CONFIG_CPU_HAS_WB
+
+#include <asm/wbflush.h>
+
+#define wmb()		fast_wmb()
+#define rmb()		fast_rmb()
+#define mb()		wbflush()
+#define iob()		wbflush()
+
+#else /* !CONFIG_CPU_HAS_WB */
+
+#define wmb()		fast_wmb()
+#define rmb()		fast_rmb()
+#define mb()		fast_mb()
+#define iob()		fast_iob()
+
+#endif /* !CONFIG_CPU_HAS_WB */
+
+#ifdef CONFIG_SMP
+#define smp_mb()	mb()
+#define smp_rmb()	rmb()
+#define smp_wmb()	wmb()
+#define smp_read_barrier_depends()	read_barrier_depends()
+#else
+#define smp_mb()	barrier()
+#define smp_rmb()	barrier()
+#define smp_wmb()	barrier()
+#define smp_read_barrier_depends()	do { } while(0)
+#endif
+
+#define set_mb(var, value) \
+do { var = value; mb(); } while (0)
+
+#define set_wmb(var, value) \
+do { var = value; wmb(); } while (0)
+
+/*
+ * switch_to(n) should switch tasks to task nr n, first
+ * checking that n isn't the current task, in which case it does nothing.
+ */
+extern asmlinkage void *resume(void *last, void *next, void *next_ti);
+
+struct task_struct;
+
+#define switch_to(prev,next,last) \
+do { \
+	(last) = resume(prev, next, next->thread_info); \
+} while(0)
+
+#define ROT_IN_PIECES							\
+	"	.set	noreorder	\n"				\
+	"	.set	reorder		\n"
+
+static inline unsigned long __xchg_u32(volatile int * m, unsigned int val)
+{
+	__u32 retval;
+
+	if (cpu_has_llsc && R10000_LLSC_WAR) {
+		unsigned long dummy;
+
+		__asm__ __volatile__(
+		"1:	ll	%0, %3			# xchg_u32	\n"
+		"	move	%2, %z4					\n"
+		"	sc	%2, %1					\n"
+		"	beqzl	%2, 1b					\n"
+		ROT_IN_PIECES
+#ifdef CONFIG_SMP
+		"	sync						\n"
+#endif
+		: "=&r" (retval), "=m" (*m), "=&r" (dummy)
+		: "R" (*m), "Jr" (val)
+		: "memory");
+	} else if (cpu_has_llsc) {
+		unsigned long dummy;
+
+		__asm__ __volatile__(
+		"1:	ll	%0, %3			# xchg_u32	\n"
+		"	move	%2, %z4					\n"
+		"	sc	%2, %1					\n"
+		"	beqz	%2, 1b					\n"
+#ifdef CONFIG_SMP
+		"	sync						\n"
+#endif
+		: "=&r" (retval), "=m" (*m), "=&r" (dummy)
+		: "R" (*m), "Jr" (val)
+		: "memory");
+	} else {
+		unsigned long flags;
+
+		local_irq_save(flags);
+		retval = *m;
+		*m = val;
+		local_irq_restore(flags);	/* implies memory barrier  */
+	}
+
+	return retval;
+}
+
+#ifdef CONFIG_MIPS64
+static inline __u64 __xchg_u64(volatile __u64 * m, __u64 val)
+{
+	__u64 retval;
+
+	if (cpu_has_llsc && R10000_LLSC_WAR) {
+		unsigned long dummy;
+
+		__asm__ __volatile__(
+		"1:	lld	%0, %3			# xchg_u64	\n"
+		"	move	%2, %z4					\n"
+		"	scd	%2, %1					\n"
+		"	beqzl	%2, 1b					\n"
+		ROT_IN_PIECES
+#ifdef CONFIG_SMP
+		"	sync						\n"
+#endif
+		: "=&r" (retval), "=m" (*m), "=&r" (dummy)
+		: "R" (*m), "Jr" (val)
+		: "memory");
+	} else if (cpu_has_llsc) {
+		unsigned long dummy;
+
+		__asm__ __volatile__(
+		"1:	lld	%0, %3			# xchg_u64	\n"
+		"	move	%2, %z4					\n"
+		"	scd	%2, %1					\n"
+		"	beqz	%2, 1b					\n"
+#ifdef CONFIG_SMP
+		"	sync						\n"
+#endif
+		: "=&r" (retval), "=m" (*m), "=&r" (dummy)
+		: "R" (*m), "Jr" (val)
+		: "memory");
+	} else {
+		unsigned long flags;
+
+		local_irq_save(flags);
+		retval = *m;
+		*m = val;
+		local_irq_restore(flags);	/* implies memory barrier  */
+	}
+
+	return retval;
+}
+#else
+extern __u64 __xchg_u64_unsupported_on_32bit_kernels(volatile __u64 * m, __u64 val);
+#define __xchg_u64 __xchg_u64_unsupported_on_32bit_kernels
+#endif
+
+/* This function doesn't exist, so you'll get a linker error
+   if something tries to do an invalid xchg().  */
+extern void __xchg_called_with_bad_pointer(void);
+
+static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
+{
+	switch (size) {
+		case 4:
+			return __xchg_u32(ptr, x);
+		case 8:
+			return __xchg_u64(ptr, x);
+	}
+	__xchg_called_with_bad_pointer();
+	return x;
+}
+
+#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
+#define tas(ptr) (xchg((ptr),1))
+
+#define __HAVE_ARCH_CMPXCHG 1
+
+static inline unsigned long __cmpxchg_u32(volatile int * m, unsigned long old,
+	unsigned long new)
+{
+	__u32 retval;
+
+	if (cpu_has_llsc && R10000_LLSC_WAR) {
+		__asm__ __volatile__(
+		"	.set	noat					\n"
+		"1:	ll	%0, %2			# __cmpxchg_u32	\n"
+		"	bne	%0, %z3, 2f				\n"
+		"	move	$1, %z4					\n"
+		"	sc	$1, %1					\n"
+		"	beqzl	$1, 1b					\n"
+		ROT_IN_PIECES
+#ifdef CONFIG_SMP
+		"	sync						\n"
+#endif
+		"2:							\n"
+		"	.set	at					\n"
+		: "=&r" (retval), "=m" (*m)
+		: "R" (*m), "Jr" (old), "Jr" (new)
+		: "memory");
+	} else if (cpu_has_llsc) {
+		__asm__ __volatile__(
+		"	.set	noat					\n"
+		"1:	ll	%0, %2			# __cmpxchg_u32	\n"
+		"	bne	%0, %z3, 2f				\n"
+		"	move	$1, %z4					\n"
+		"	sc	$1, %1					\n"
+		"	beqz	$1, 1b					\n"
+#ifdef CONFIG_SMP
+		"	sync						\n"
+#endif
+		"2:							\n"
+		"	.set	at					\n"
+		: "=&r" (retval), "=m" (*m)
+		: "R" (*m), "Jr" (old), "Jr" (new)
+		: "memory");
+	} else {
+		unsigned long flags;
+
+		local_irq_save(flags);
+		retval = *m;
+		if (retval == old)
+			*m = new;
+		local_irq_restore(flags);	/* implies memory barrier  */
+	}
+
+	return retval;
+}
+
+#ifdef CONFIG_MIPS64
+static inline unsigned long __cmpxchg_u64(volatile int * m, unsigned long old,
+	unsigned long new)
+{
+	__u64 retval;
+
+	if (cpu_has_llsc) {
+		__asm__ __volatile__(
+		"	.set	noat					\n"
+		"1:	lld	%0, %2			# __cmpxchg_u64	\n"
+		"	bne	%0, %z3, 2f				\n"
+		"	move	$1, %z4					\n"
+		"	scd	$1, %1					\n"
+		"	beqzl	$1, 1b					\n"
+		ROT_IN_PIECES
+#ifdef CONFIG_SMP
+		"	sync						\n"
+#endif
+		"2:							\n"
+		"	.set	at					\n"
+		: "=&r" (retval), "=m" (*m)
+		: "R" (*m), "Jr" (old), "Jr" (new)
+		: "memory");
+	} else if (cpu_has_llsc) {
+		__asm__ __volatile__(
+		"	.set	noat					\n"
+		"1:	lld	%0, %2			# __cmpxchg_u64	\n"
+		"	bne	%0, %z3, 2f				\n"
+		"	move	$1, %z4					\n"
+		"	scd	$1, %1					\n"
+		"	beqz	$1, 1b					\n"
+#ifdef CONFIG_SMP
+		"	sync						\n"
+#endif
+		"2:							\n"
+		"	.set	at					\n"
+		: "=&r" (retval), "=m" (*m)
+		: "R" (*m), "Jr" (old), "Jr" (new)
+		: "memory");
+	} else {
+		unsigned long flags;
+
+		local_irq_save(flags);
+		retval = *m;
+		if (retval == old)
+			*m = new;
+		local_irq_restore(flags);	/* implies memory barrier  */
+	}
+
+	return retval;
+}
+#else
+extern unsigned long __cmpxchg_u64_unsupported_on_32bit_kernels(
+	volatile int * m, unsigned long old, unsigned long new);
+#define __cmpxchg_u64 __cmpxchg_u64_unsupported_on_32bit_kernels
+#endif
+
+/* This function doesn't exist, so you'll get a linker error
+   if something tries to do an invalid cmpxchg().  */
+extern void __cmpxchg_called_with_bad_pointer(void);
+
+static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
+	unsigned long new, int size)
+{
+	switch (size) {
+	case 4:
+		return __cmpxchg_u32(ptr, old, new);
+	case 8:
+		return __cmpxchg_u64(ptr, old, new);
+	}
+	__cmpxchg_called_with_bad_pointer();
+	return old;
+}
+
+#define cmpxchg(ptr,old,new) ((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(old), (unsigned long)(new),sizeof(*(ptr))))
+
+extern void *set_except_vector(int n, void *addr);
+extern void per_cpu_trap_init(void);
+
+extern NORET_TYPE void __die(const char *, struct pt_regs *, const char *file,
+	const char *func, unsigned long line);
+extern void __die_if_kernel(const char *, struct pt_regs *, const char *file,
+	const char *func, unsigned long line);
+
+#define die(msg, regs)							\
+	__die(msg, regs, __FILE__ ":", __FUNCTION__, __LINE__)
+#define die_if_kernel(msg, regs)					\
+	__die_if_kernel(msg, regs, __FILE__ ":", __FUNCTION__, __LINE__)
+
+extern int stop_a_enabled;
+
+/*
+ * Taken from include/asm-ia64/system.h; prevents deadlock on SMP
+ * systems.
+ */
+#define prepare_arch_switch(rq, next)		\
+do {						\
+	spin_lock(&(next)->switch_lock);	\
+	spin_unlock(&(rq)->lock);		\
+} while (0)
+#define finish_arch_switch(rq, prev)	spin_unlock_irq(&(prev)->switch_lock)
+#define task_running(rq, p) 		((rq)->curr == (p) || spin_is_locked(&(p)->switch_lock))
+
+#define arch_align_stack(x) (x)
+
+#endif /* _ASM_SYSTEM_H */