summaryrefslogtreecommitdiffstats
path: root/arch/nios2/mm
diff options
context:
space:
mode:
Diffstat (limited to 'arch/nios2/mm')
-rw-r--r--arch/nios2/mm/Makefile14
-rw-r--r--arch/nios2/mm/cacheflush.c271
-rw-r--r--arch/nios2/mm/dma-mapping.c186
-rw-r--r--arch/nios2/mm/extable.c25
-rw-r--r--arch/nios2/mm/fault.c251
-rw-r--r--arch/nios2/mm/init.c142
-rw-r--r--arch/nios2/mm/ioremap.c187
-rw-r--r--arch/nios2/mm/mmu_context.c116
-rw-r--r--arch/nios2/mm/pgtable.c74
-rw-r--r--arch/nios2/mm/tlb.c275
-rw-r--r--arch/nios2/mm/uaccess.c163
11 files changed, 1704 insertions, 0 deletions
diff --git a/arch/nios2/mm/Makefile b/arch/nios2/mm/Makefile
new file mode 100644
index 000000000000..3cbd0840873c
--- /dev/null
+++ b/arch/nios2/mm/Makefile
@@ -0,0 +1,14 @@
+#
+# Makefile for the Nios2-specific parts of the memory manager.
+#
+
+obj-y += cacheflush.o
+obj-y += dma-mapping.o
+obj-y += extable.o
+obj-y += fault.o
+obj-y += init.o
+obj-y += ioremap.o
+obj-y += mmu_context.o
+obj-y += pgtable.o
+obj-y += tlb.o
+obj-y += uaccess.o
diff --git a/arch/nios2/mm/cacheflush.c b/arch/nios2/mm/cacheflush.c
new file mode 100644
index 000000000000..2ae482b42669
--- /dev/null
+++ b/arch/nios2/mm/cacheflush.c
@@ -0,0 +1,271 @@
+/*
+ * 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) 2009, Wind River Systems Inc
+ * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ */
+
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+
+#include <asm/cacheflush.h>
+#include <asm/cpuinfo.h>
+
+static void __flush_dcache(unsigned long start, unsigned long end)
+{
+ unsigned long addr;
+
+ start &= ~(cpuinfo.dcache_line_size - 1);
+ end += (cpuinfo.dcache_line_size - 1);
+ end &= ~(cpuinfo.dcache_line_size - 1);
+
+ if (end > start + cpuinfo.dcache_size)
+ end = start + cpuinfo.dcache_size;
+
+ for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
+ __asm__ __volatile__ (" flushda 0(%0)\n"
+ : /* Outputs */
+ : /* Inputs */ "r"(addr)
+ /* : No clobber */);
+ }
+}
+
+static void __flush_dcache_all(unsigned long start, unsigned long end)
+{
+ unsigned long addr;
+
+ start &= ~(cpuinfo.dcache_line_size - 1);
+ end += (cpuinfo.dcache_line_size - 1);
+ end &= ~(cpuinfo.dcache_line_size - 1);
+
+ if (end > start + cpuinfo.dcache_size)
+ end = start + cpuinfo.dcache_size;
+
+ for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
+ __asm__ __volatile__ (" flushd 0(%0)\n"
+ : /* Outputs */
+ : /* Inputs */ "r"(addr)
+ /* : No clobber */);
+ }
+}
+
+static void __invalidate_dcache(unsigned long start, unsigned long end)
+{
+ unsigned long addr;
+
+ start &= ~(cpuinfo.dcache_line_size - 1);
+ end += (cpuinfo.dcache_line_size - 1);
+ end &= ~(cpuinfo.dcache_line_size - 1);
+
+ if (end > start + cpuinfo.dcache_size)
+ end = start + cpuinfo.dcache_size;
+
+ for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
+ __asm__ __volatile__ (" initda 0(%0)\n"
+ : /* Outputs */
+ : /* Inputs */ "r"(addr)
+ /* : No clobber */);
+ }
+}
+
+static void __flush_icache(unsigned long start, unsigned long end)
+{
+ unsigned long addr;
+
+ start &= ~(cpuinfo.icache_line_size - 1);
+ end += (cpuinfo.icache_line_size - 1);
+ end &= ~(cpuinfo.icache_line_size - 1);
+
+ if (end > start + cpuinfo.icache_size)
+ end = start + cpuinfo.icache_size;
+
+ for (addr = start; addr < end; addr += cpuinfo.icache_line_size) {
+ __asm__ __volatile__ (" flushi %0\n"
+ : /* Outputs */
+ : /* Inputs */ "r"(addr)
+ /* : No clobber */);
+ }
+ __asm__ __volatile(" flushp\n");
+}
+
+static void flush_aliases(struct address_space *mapping, struct page *page)
+{
+ struct mm_struct *mm = current->active_mm;
+ struct vm_area_struct *mpnt;
+ pgoff_t pgoff;
+
+ pgoff = page->index;
+
+ flush_dcache_mmap_lock(mapping);
+ vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
+ unsigned long offset;
+
+ if (mpnt->vm_mm != mm)
+ continue;
+ if (!(mpnt->vm_flags & VM_MAYSHARE))
+ continue;
+
+ offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
+ flush_cache_page(mpnt, mpnt->vm_start + offset,
+ page_to_pfn(page));
+ }
+ flush_dcache_mmap_unlock(mapping);
+}
+
+void flush_cache_all(void)
+{
+ __flush_dcache_all(0, cpuinfo.dcache_size);
+ __flush_icache(0, cpuinfo.icache_size);
+}
+
+void flush_cache_mm(struct mm_struct *mm)
+{
+ flush_cache_all();
+}
+
+void flush_cache_dup_mm(struct mm_struct *mm)
+{
+ flush_cache_all();
+}
+
+void flush_icache_range(unsigned long start, unsigned long end)
+{
+ __flush_icache(start, end);
+}
+
+void flush_dcache_range(unsigned long start, unsigned long end)
+{
+ __flush_dcache(start, end);
+}
+EXPORT_SYMBOL(flush_dcache_range);
+
+void invalidate_dcache_range(unsigned long start, unsigned long end)
+{
+ __invalidate_dcache(start, end);
+}
+EXPORT_SYMBOL(invalidate_dcache_range);
+
+void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ __flush_dcache(start, end);
+ if (vma == NULL || (vma->vm_flags & VM_EXEC))
+ __flush_icache(start, end);
+}
+
+void flush_icache_page(struct vm_area_struct *vma, struct page *page)
+{
+ unsigned long start = (unsigned long) page_address(page);
+ unsigned long end = start + PAGE_SIZE;
+
+ __flush_icache(start, end);
+}
+
+void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
+ unsigned long pfn)
+{
+ unsigned long start = vmaddr;
+ unsigned long end = start + PAGE_SIZE;
+
+ __flush_dcache(start, end);
+ if (vma->vm_flags & VM_EXEC)
+ __flush_icache(start, end);
+}
+
+void flush_dcache_page(struct page *page)
+{
+ struct address_space *mapping;
+
+ /*
+ * The zero page is never written to, so never has any dirty
+ * cache lines, and therefore never needs to be flushed.
+ */
+ if (page == ZERO_PAGE(0))
+ return;
+
+ mapping = page_mapping(page);
+
+ /* Flush this page if there are aliases. */
+ if (mapping && !mapping_mapped(mapping)) {
+ clear_bit(PG_dcache_clean, &page->flags);
+ } else {
+ unsigned long start = (unsigned long)page_address(page);
+
+ __flush_dcache_all(start, start + PAGE_SIZE);
+ if (mapping)
+ flush_aliases(mapping, page);
+ set_bit(PG_dcache_clean, &page->flags);
+ }
+}
+EXPORT_SYMBOL(flush_dcache_page);
+
+void update_mmu_cache(struct vm_area_struct *vma,
+ unsigned long address, pte_t *pte)
+{
+ unsigned long pfn = pte_pfn(*pte);
+ struct page *page;
+
+ if (!pfn_valid(pfn))
+ return;
+
+ /*
+ * The zero page is never written to, so never has any dirty
+ * cache lines, and therefore never needs to be flushed.
+ */
+ page = pfn_to_page(pfn);
+ if (page == ZERO_PAGE(0))
+ return;
+
+ if (!PageReserved(page) &&
+ !test_and_set_bit(PG_dcache_clean, &page->flags)) {
+ unsigned long start = page_to_virt(page);
+ struct address_space *mapping;
+
+ __flush_dcache(start, start + PAGE_SIZE);
+
+ mapping = page_mapping(page);
+ if (mapping)
+ flush_aliases(mapping, page);
+ }
+}
+
+void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
+ struct page *to)
+{
+ __flush_dcache(vaddr, vaddr + PAGE_SIZE);
+ copy_page(vto, vfrom);
+ __flush_dcache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
+}
+
+void clear_user_page(void *addr, unsigned long vaddr, struct page *page)
+{
+ __flush_dcache(vaddr, vaddr + PAGE_SIZE);
+ clear_page(addr);
+ __flush_dcache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
+}
+
+void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
+ unsigned long user_vaddr,
+ void *dst, void *src, int len)
+{
+ flush_cache_page(vma, user_vaddr, page_to_pfn(page));
+ memcpy(dst, src, len);
+ __flush_dcache((unsigned long)src, (unsigned long)src + len);
+ if (vma->vm_flags & VM_EXEC)
+ __flush_icache((unsigned long)src, (unsigned long)src + len);
+}
+
+void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
+ unsigned long user_vaddr,
+ void *dst, void *src, int len)
+{
+ flush_cache_page(vma, user_vaddr, page_to_pfn(page));
+ memcpy(dst, src, len);
+ __flush_dcache((unsigned long)dst, (unsigned long)dst + len);
+ if (vma->vm_flags & VM_EXEC)
+ __flush_icache((unsigned long)dst, (unsigned long)dst + len);
+}
diff --git a/arch/nios2/mm/dma-mapping.c b/arch/nios2/mm/dma-mapping.c
new file mode 100644
index 000000000000..ac5da7594f0b
--- /dev/null
+++ b/arch/nios2/mm/dma-mapping.c
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2009 Wind River Systems Inc
+ * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ *
+ * Based on DMA code from MIPS.
+ *
+ * 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.
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/export.h>
+#include <linux/string.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/cache.h>
+#include <asm/cacheflush.h>
+
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp)
+{
+ void *ret;
+
+ /* ignore region specifiers */
+ gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
+
+ /* optimized page clearing */
+ gfp |= __GFP_ZERO;
+
+ if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
+ gfp |= GFP_DMA;
+
+ ret = (void *) __get_free_pages(gfp, get_order(size));
+ if (ret != NULL) {
+ *dma_handle = virt_to_phys(ret);
+ flush_dcache_range((unsigned long) ret,
+ (unsigned long) ret + size);
+ ret = UNCAC_ADDR(ret);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(dma_alloc_coherent);
+
+void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle)
+{
+ unsigned long addr = (unsigned long) CAC_ADDR((unsigned long) vaddr);
+
+ free_pages(addr, get_order(size));
+}
+EXPORT_SYMBOL(dma_free_coherent);
+
+int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction direction)
+{
+ int i;
+
+ BUG_ON(!valid_dma_direction(direction));
+
+ for_each_sg(sg, sg, nents, i) {
+ void *addr;
+
+ addr = sg_virt(sg);
+ if (addr) {
+ __dma_sync_for_device(addr, sg->length, direction);
+ sg->dma_address = sg_phys(sg);
+ }
+ }
+
+ return nents;
+}
+EXPORT_SYMBOL(dma_map_sg);
+
+dma_addr_t dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction direction)
+{
+ void *addr;
+
+ BUG_ON(!valid_dma_direction(direction));
+
+ addr = page_address(page) + offset;
+ __dma_sync_for_device(addr, size, direction);
+
+ return page_to_phys(page) + offset;
+}
+EXPORT_SYMBOL(dma_map_page);
+
+void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
+ enum dma_data_direction direction)
+{
+ BUG_ON(!valid_dma_direction(direction));
+
+ __dma_sync_for_cpu(phys_to_virt(dma_address), size, direction);
+}
+EXPORT_SYMBOL(dma_unmap_page);
+
+void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
+ enum dma_data_direction direction)
+{
+ void *addr;
+ int i;
+
+ BUG_ON(!valid_dma_direction(direction));
+
+ if (direction == DMA_TO_DEVICE)
+ return;
+
+ for_each_sg(sg, sg, nhwentries, i) {
+ addr = sg_virt(sg);
+ if (addr)
+ __dma_sync_for_cpu(addr, sg->length, direction);
+ }
+}
+EXPORT_SYMBOL(dma_unmap_sg);
+
+void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
+ size_t size, enum dma_data_direction direction)
+{
+ BUG_ON(!valid_dma_direction(direction));
+
+ __dma_sync_for_cpu(phys_to_virt(dma_handle), size, direction);
+}
+EXPORT_SYMBOL(dma_sync_single_for_cpu);
+
+void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
+ size_t size, enum dma_data_direction direction)
+{
+ BUG_ON(!valid_dma_direction(direction));
+
+ __dma_sync_for_device(phys_to_virt(dma_handle), size, direction);
+}
+EXPORT_SYMBOL(dma_sync_single_for_device);
+
+void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
+ unsigned long offset, size_t size,
+ enum dma_data_direction direction)
+{
+ BUG_ON(!valid_dma_direction(direction));
+
+ __dma_sync_for_cpu(phys_to_virt(dma_handle), size, direction);
+}
+EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
+
+void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
+ unsigned long offset, size_t size,
+ enum dma_data_direction direction)
+{
+ BUG_ON(!valid_dma_direction(direction));
+
+ __dma_sync_for_device(phys_to_virt(dma_handle), size, direction);
+}
+EXPORT_SYMBOL(dma_sync_single_range_for_device);
+
+void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
+ enum dma_data_direction direction)
+{
+ int i;
+
+ BUG_ON(!valid_dma_direction(direction));
+
+ /* Make sure that gcc doesn't leave the empty loop body. */
+ for_each_sg(sg, sg, nelems, i)
+ __dma_sync_for_cpu(sg_virt(sg), sg->length, direction);
+}
+EXPORT_SYMBOL(dma_sync_sg_for_cpu);
+
+void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
+ int nelems, enum dma_data_direction direction)
+{
+ int i;
+
+ BUG_ON(!valid_dma_direction(direction));
+
+ /* Make sure that gcc doesn't leave the empty loop body. */
+ for_each_sg(sg, sg, nelems, i)
+ __dma_sync_for_device(sg_virt(sg), sg->length, direction);
+
+}
+EXPORT_SYMBOL(dma_sync_sg_for_device);
diff --git a/arch/nios2/mm/extable.c b/arch/nios2/mm/extable.c
new file mode 100644
index 000000000000..4d2fc5a589d0
--- /dev/null
+++ b/arch/nios2/mm/extable.c
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2010, Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2009, Wind River Systems Inc
+ * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/uaccess.h>
+
+int fixup_exception(struct pt_regs *regs)
+{
+ const struct exception_table_entry *fixup;
+
+ fixup = search_exception_tables(regs->ea);
+ if (fixup) {
+ regs->ea = fixup->fixup;
+ return 1;
+ }
+
+ return 0;
+}
diff --git a/arch/nios2/mm/fault.c b/arch/nios2/mm/fault.c
new file mode 100644
index 000000000000..15a0bb5fc06d
--- /dev/null
+++ b/arch/nios2/mm/fault.c
@@ -0,0 +1,251 @@
+/*
+ * Copyright (C) 2009 Wind River Systems Inc
+ * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ *
+ * based on arch/mips/mm/fault.c which is:
+ *
+ * Copyright (C) 1995-2000 Ralf Baechle
+ *
+ * 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.
+ */
+
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/ptrace.h>
+
+#include <asm/mmu_context.h>
+#include <asm/traps.h>
+
+#define EXC_SUPERV_INSN_ACCESS 9 /* Supervisor only instruction address */
+#define EXC_SUPERV_DATA_ACCESS 11 /* Supervisor only data address */
+#define EXC_X_PROTECTION_FAULT 13 /* TLB permission violation (x) */
+#define EXC_R_PROTECTION_FAULT 14 /* TLB permission violation (r) */
+#define EXC_W_PROTECTION_FAULT 15 /* TLB permission violation (w) */
+
+/*
+ * This routine handles page faults. It determines the address,
+ * and the problem, and then passes it off to one of the appropriate
+ * routines.
+ */
+asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long cause,
+ unsigned long address)
+{
+ struct vm_area_struct *vma = NULL;
+ struct task_struct *tsk = current;
+ struct mm_struct *mm = tsk->mm;
+ int code = SEGV_MAPERR;
+ int fault;
+ unsigned int flags = 0;
+
+ cause >>= 2;
+
+ /* Restart the instruction */
+ regs->ea -= 4;
+
+ /*
+ * We fault-in kernel-space virtual memory on-demand. The
+ * 'reference' page table is init_mm.pgd.
+ *
+ * NOTE! We MUST NOT take any locks for this case. We may
+ * be in an interrupt or a critical region, and should
+ * only copy the information from the master page table,
+ * nothing more.
+ */
+ if (unlikely(address >= VMALLOC_START && address <= VMALLOC_END)) {
+ if (user_mode(regs))
+ goto bad_area_nosemaphore;
+ else
+ goto vmalloc_fault;
+ }
+
+ if (unlikely(address >= TASK_SIZE))
+ goto bad_area_nosemaphore;
+
+ /*
+ * If we're in an interrupt or have no user
+ * context, we must not take the fault..
+ */
+ if (in_atomic() || !mm)
+ goto bad_area_nosemaphore;
+
+ if (user_mode(regs))
+ flags |= FAULT_FLAG_USER;
+
+ if (!down_read_trylock(&mm->mmap_sem)) {
+ if (!user_mode(regs) && !search_exception_tables(regs->ea))
+ goto bad_area_nosemaphore;
+ down_read(&mm->mmap_sem);
+ }
+
+ vma = find_vma(mm, address);
+ if (!vma)
+ goto bad_area;
+ if (vma->vm_start <= address)
+ goto good_area;
+ if (!(vma->vm_flags & VM_GROWSDOWN))
+ goto bad_area;
+ if (expand_stack(vma, address))
+ goto bad_area;
+/*
+ * Ok, we have a good vm_area for this memory access, so
+ * we can handle it..
+ */
+good_area:
+ code = SEGV_ACCERR;
+
+ switch (cause) {
+ case EXC_SUPERV_INSN_ACCESS:
+ goto bad_area;
+ case EXC_SUPERV_DATA_ACCESS:
+ goto bad_area;
+ case EXC_X_PROTECTION_FAULT:
+ if (!(vma->vm_flags & VM_EXEC))
+ goto bad_area;
+ break;
+ case EXC_R_PROTECTION_FAULT:
+ if (!(vma->vm_flags & VM_READ))
+ goto bad_area;
+ break;
+ case EXC_W_PROTECTION_FAULT:
+ if (!(vma->vm_flags & VM_WRITE))
+ goto bad_area;
+ flags = FAULT_FLAG_WRITE;
+ break;
+ }
+
+survive:
+ /*
+ * If for any reason at all we couldn't handle the fault,
+ * make sure we exit gracefully rather than endlessly redo
+ * the fault.
+ */
+ fault = handle_mm_fault(mm, vma, address, flags);
+ if (unlikely(fault & VM_FAULT_ERROR)) {
+ if (fault & VM_FAULT_OOM)
+ goto out_of_memory;
+ else if (fault & VM_FAULT_SIGBUS)
+ goto do_sigbus;
+ BUG();
+ }
+ if (fault & VM_FAULT_MAJOR)
+ tsk->maj_flt++;
+ else
+ tsk->min_flt++;
+
+ up_read(&mm->mmap_sem);
+ return;
+
+/*
+ * Something tried to access memory that isn't in our memory map..
+ * Fix it, but check if it's kernel or user first..
+ */
+bad_area:
+ up_read(&mm->mmap_sem);
+
+bad_area_nosemaphore:
+ /* User mode accesses just cause a SIGSEGV */
+ if (user_mode(regs)) {
+ pr_alert("%s: unhandled page fault (%d) at 0x%08lx, "
+ "cause %ld\n", current->comm, SIGSEGV, address, cause);
+ show_regs(regs);
+ _exception(SIGSEGV, regs, code, address);
+ return;
+ }
+
+no_context:
+ /* Are we prepared to handle this kernel fault? */
+ if (fixup_exception(regs))
+ return;
+
+ /*
+ * Oops. The kernel tried to access some bad page. We'll have to
+ * terminate things with extreme prejudice.
+ */
+ bust_spinlocks(1);
+
+ pr_alert("Unable to handle kernel %s at virtual address %08lx",
+ address < PAGE_SIZE ? "NULL pointer dereference" :
+ "paging request", address);
+ pr_alert("ea = %08lx, ra = %08lx, cause = %ld\n", regs->ea, regs->ra,
+ cause);
+ panic("Oops");
+ return;
+
+/*
+ * We ran out of memory, or some other thing happened to us that made
+ * us unable to handle the page fault gracefully.
+ */
+out_of_memory:
+ up_read(&mm->mmap_sem);
+ if (is_global_init(tsk)) {
+ yield();
+ down_read(&mm->mmap_sem);
+ goto survive;
+ }
+ if (!user_mode(regs))
+ goto no_context;
+ pagefault_out_of_memory();
+ return;
+
+do_sigbus:
+ up_read(&mm->mmap_sem);
+
+ /* Kernel mode? Handle exceptions or die */
+ if (!user_mode(regs))
+ goto no_context;
+
+ _exception(SIGBUS, regs, BUS_ADRERR, address);
+ return;
+
+vmalloc_fault:
+ {
+ /*
+ * Synchronize this task's top level page-table
+ * with the 'reference' page table.
+ *
+ * Do _not_ use "tsk" here. We might be inside
+ * an interrupt in the middle of a task switch..
+ */
+ int offset = pgd_index(address);
+ pgd_t *pgd, *pgd_k;
+ pud_t *pud, *pud_k;
+ pmd_t *pmd, *pmd_k;
+ pte_t *pte_k;
+
+ pgd = pgd_current + offset;
+ pgd_k = init_mm.pgd + offset;
+
+ if (!pgd_present(*pgd_k))
+ goto no_context;
+ set_pgd(pgd, *pgd_k);
+
+ pud = pud_offset(pgd, address);
+ pud_k = pud_offset(pgd_k, address);
+ if (!pud_present(*pud_k))
+ goto no_context;
+ pmd = pmd_offset(pud, address);
+ pmd_k = pmd_offset(pud_k, address);
+ if (!pmd_present(*pmd_k))
+ goto no_context;
+ set_pmd(pmd, *pmd_k);
+
+ pte_k = pte_offset_kernel(pmd_k, address);
+ if (!pte_present(*pte_k))
+ goto no_context;
+
+ flush_tlb_one(address);
+ return;
+ }
+}
diff --git a/arch/nios2/mm/init.c b/arch/nios2/mm/init.c
new file mode 100644
index 000000000000..e75c75d249d6
--- /dev/null
+++ b/arch/nios2/mm/init.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2013 Altera Corporation
+ * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2009 Wind River Systems Inc
+ * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ * Copyright (C) 2004 Microtronix Datacom Ltd
+ *
+ * based on arch/m68k/mm/init.c
+ *
+ * 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.
+ */
+
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/pagemap.h>
+#include <linux/bootmem.h>
+#include <linux/slab.h>
+#include <linux/binfmts.h>
+
+#include <asm/setup.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/sections.h>
+#include <asm/tlb.h>
+#include <asm/mmu_context.h>
+#include <asm/cpuinfo.h>
+#include <asm/processor.h>
+
+pgd_t *pgd_current;
+
+/*
+ * paging_init() continues the virtual memory environment setup which
+ * was begun by the code in arch/head.S.
+ * The parameters are pointers to where to stick the starting and ending
+ * addresses of available kernel virtual memory.
+ */
+void __init paging_init(void)
+{
+ unsigned long zones_size[MAX_NR_ZONES];
+
+ memset(zones_size, 0, sizeof(zones_size));
+
+ pagetable_init();
+ pgd_current = swapper_pg_dir;
+
+ zones_size[ZONE_NORMAL] = max_mapnr;
+
+ /* pass the memory from the bootmem allocator to the main allocator */
+ free_area_init(zones_size);
+
+ flush_dcache_range((unsigned long)empty_zero_page,
+ (unsigned long)empty_zero_page + PAGE_SIZE);
+}
+
+void __init mem_init(void)
+{
+ unsigned long end_mem = memory_end; /* this must not include
+ kernel stack at top */
+
+ pr_debug("mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
+
+ end_mem &= PAGE_MASK;
+ high_memory = __va(end_mem);
+
+ /* this will put all memory onto the freelists */
+ free_all_bootmem();
+ mem_init_print_info(NULL);
+}
+
+void __init mmu_init(void)
+{
+ flush_tlb_all();
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void __init free_initrd_mem(unsigned long start, unsigned long end)
+{
+ free_reserved_area((void *)start, (void *)end, -1, "initrd");
+}
+#endif
+
+void __init_refok free_initmem(void)
+{
+ free_initmem_default(-1);
+}
+
+#define __page_aligned(order) __aligned(PAGE_SIZE << (order))
+pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
+pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
+static struct page *kuser_page[1];
+
+static int alloc_kuser_page(void)
+{
+ extern char __kuser_helper_start[], __kuser_helper_end[];
+ int kuser_sz = __kuser_helper_end - __kuser_helper_start;
+ unsigned long vpage;
+
+ vpage = get_zeroed_page(GFP_ATOMIC);
+ if (!vpage)
+ return -ENOMEM;
+
+ /* Copy kuser helpers */
+ memcpy((void *)vpage, __kuser_helper_start, kuser_sz);
+
+ flush_icache_range(vpage, vpage + KUSER_SIZE);
+ kuser_page[0] = virt_to_page(vpage);
+
+ return 0;
+}
+arch_initcall(alloc_kuser_page);
+
+int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+{
+ struct mm_struct *mm = current->mm;
+ int ret;
+
+ down_write(&mm->mmap_sem);
+
+ /* Map kuser helpers to user space address */
+ ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
+ VM_READ | VM_EXEC | VM_MAYREAD |
+ VM_MAYEXEC, kuser_page);
+
+ up_write(&mm->mmap_sem);
+
+ return ret;
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+ return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
+}
diff --git a/arch/nios2/mm/ioremap.c b/arch/nios2/mm/ioremap.c
new file mode 100644
index 000000000000..3a28177a01eb
--- /dev/null
+++ b/arch/nios2/mm/ioremap.c
@@ -0,0 +1,187 @@
+/*
+ * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2009 Wind River Systems Inc
+ * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ * Copyright (C) 2004 Microtronix Datacom Ltd.
+ *
+ * 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.
+ */
+
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/io.h>
+
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+
+static inline void remap_area_pte(pte_t *pte, unsigned long address,
+ unsigned long size, unsigned long phys_addr,
+ unsigned long flags)
+{
+ unsigned long end;
+ unsigned long pfn;
+ pgprot_t pgprot = __pgprot(_PAGE_GLOBAL | _PAGE_PRESENT | _PAGE_READ
+ | _PAGE_WRITE | flags);
+
+ address &= ~PMD_MASK;
+ end = address + size;
+ if (end > PMD_SIZE)
+ end = PMD_SIZE;
+ if (address >= end)
+ BUG();
+ pfn = PFN_DOWN(phys_addr);
+ do {
+ if (!pte_none(*pte)) {
+ pr_err("remap_area_pte: page already exists\n");
+ BUG();
+ }
+ set_pte(pte, pfn_pte(pfn, pgprot));
+ address += PAGE_SIZE;
+ pfn++;
+ pte++;
+ } while (address && (address < end));
+}
+
+static inline int remap_area_pmd(pmd_t *pmd, unsigned long address,
+ unsigned long size, unsigned long phys_addr,
+ unsigned long flags)
+{
+ unsigned long end;
+
+ address &= ~PGDIR_MASK;
+ end = address + size;
+ if (end > PGDIR_SIZE)
+ end = PGDIR_SIZE;
+ phys_addr -= address;
+ if (address >= end)
+ BUG();
+ do {
+ pte_t *pte = pte_alloc_kernel(pmd, address);
+
+ if (!pte)
+ return -ENOMEM;
+ remap_area_pte(pte, address, end - address, address + phys_addr,
+ flags);
+ address = (address + PMD_SIZE) & PMD_MASK;
+ pmd++;
+ } while (address && (address < end));
+ return 0;
+}
+
+static int remap_area_pages(unsigned long address, unsigned long phys_addr,
+ unsigned long size, unsigned long flags)
+{
+ int error;
+ pgd_t *dir;
+ unsigned long end = address + size;
+
+ phys_addr -= address;
+ dir = pgd_offset(&init_mm, address);
+ flush_cache_all();
+ if (address >= end)
+ BUG();
+ do {
+ pud_t *pud;
+ pmd_t *pmd;
+
+ error = -ENOMEM;
+ pud = pud_alloc(&init_mm, dir, address);
+ if (!pud)
+ break;
+ pmd = pmd_alloc(&init_mm, pud, address);
+ if (!pmd)
+ break;
+ if (remap_area_pmd(pmd, address, end - address,
+ phys_addr + address, flags))
+ break;
+ error = 0;
+ address = (address + PGDIR_SIZE) & PGDIR_MASK;
+ dir++;
+ } while (address && (address < end));
+ flush_tlb_all();
+ return error;
+}
+
+#define IS_MAPPABLE_UNCACHEABLE(addr) (addr < 0x20000000UL)
+
+/*
+ * Map some physical address range into the kernel address space.
+ */
+void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
+ unsigned long cacheflag)
+{
+ struct vm_struct *area;
+ unsigned long offset;
+ unsigned long last_addr;
+ void *addr;
+
+ /* Don't allow wraparound or zero size */
+ last_addr = phys_addr + size - 1;
+
+ if (!size || last_addr < phys_addr)
+ return NULL;
+
+ /* Don't allow anybody to remap normal RAM that we're using */
+ if (phys_addr > PHYS_OFFSET && phys_addr < virt_to_phys(high_memory)) {
+ char *t_addr, *t_end;
+ struct page *page;
+
+ t_addr = __va(phys_addr);
+ t_end = t_addr + (size - 1);
+ for (page = virt_to_page(t_addr);
+ page <= virt_to_page(t_end); page++)
+ if (!PageReserved(page))
+ return NULL;
+ }
+
+ /*
+ * Map uncached objects in the low part of address space to
+ * CONFIG_NIOS2_IO_REGION_BASE
+ */
+ if (IS_MAPPABLE_UNCACHEABLE(phys_addr) &&
+ IS_MAPPABLE_UNCACHEABLE(last_addr) &&
+ !(cacheflag & _PAGE_CACHED))
+ return (void __iomem *)(CONFIG_NIOS2_IO_REGION_BASE + phys_addr);
+
+ /* Mappings have to be page-aligned */
+ offset = phys_addr & ~PAGE_MASK;
+ phys_addr &= PAGE_MASK;
+ size = PAGE_ALIGN(last_addr + 1) - phys_addr;
+
+ /* Ok, go for it */
+ area = get_vm_area(size, VM_IOREMAP);
+ if (!area)
+ return NULL;
+ addr = area->addr;
+ if (remap_area_pages((unsigned long) addr, phys_addr, size,
+ cacheflag)) {
+ vunmap(addr);
+ return NULL;
+ }
+ return (void __iomem *) (offset + (char *)addr);
+}
+EXPORT_SYMBOL(__ioremap);
+
+/*
+ * __iounmap unmaps nearly everything, so be careful
+ * it doesn't free currently pointer/page tables anymore but it
+ * wasn't used anyway and might be added later.
+ */
+void __iounmap(void __iomem *addr)
+{
+ struct vm_struct *p;
+
+ if ((unsigned long) addr > CONFIG_NIOS2_IO_REGION_BASE)
+ return;
+
+ p = remove_vm_area((void *) (PAGE_MASK & (unsigned long __force) addr));
+ if (!p)
+ pr_err("iounmap: bad address %p\n", addr);
+ kfree(p);
+}
+EXPORT_SYMBOL(__iounmap);
diff --git a/arch/nios2/mm/mmu_context.c b/arch/nios2/mm/mmu_context.c
new file mode 100644
index 000000000000..45d6b9c58d67
--- /dev/null
+++ b/arch/nios2/mm/mmu_context.c
@@ -0,0 +1,116 @@
+/*
+ * MMU context handling.
+ *
+ * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2009 Wind River Systems Inc
+ * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ *
+ * 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.
+ */
+
+#include <linux/mm.h>
+
+#include <asm/cpuinfo.h>
+#include <asm/mmu_context.h>
+#include <asm/tlb.h>
+
+/* The pids position and mask in context */
+#define PID_SHIFT 0
+#define PID_BITS (cpuinfo.tlb_pid_num_bits)
+#define PID_MASK ((1UL << PID_BITS) - 1)
+
+/* The versions position and mask in context */
+#define VERSION_BITS (32 - PID_BITS)
+#define VERSION_SHIFT (PID_SHIFT + PID_BITS)
+#define VERSION_MASK ((1UL << VERSION_BITS) - 1)
+
+/* Return the version part of a context */
+#define CTX_VERSION(c) (((c) >> VERSION_SHIFT) & VERSION_MASK)
+
+/* Return the pid part of a context */
+#define CTX_PID(c) (((c) >> PID_SHIFT) & PID_MASK)
+
+/* Value of the first context (version 1, pid 0) */
+#define FIRST_CTX ((1UL << VERSION_SHIFT) | (0 << PID_SHIFT))
+
+static mm_context_t next_mmu_context;
+
+/*
+ * Initialize MMU context management stuff.
+ */
+void __init mmu_context_init(void)
+{
+ /* We need to set this here because the value depends on runtime data
+ * from cpuinfo */
+ next_mmu_context = FIRST_CTX;
+}
+
+/*
+ * Set new context (pid), keep way
+ */
+static void set_context(mm_context_t context)
+{
+ set_mmu_pid(CTX_PID(context));
+}
+
+static mm_context_t get_new_context(void)
+{
+ /* Return the next pid */
+ next_mmu_context += (1UL << PID_SHIFT);
+
+ /* If the pid field wraps around we increase the version and
+ * flush the tlb */
+ if (unlikely(CTX_PID(next_mmu_context) == 0)) {
+ /* Version is incremented since the pid increment above
+ * overflows info version */
+ flush_cache_all();
+ flush_tlb_all();
+ }
+
+ /* If the version wraps we start over with the first generation, we do
+ * not need to flush the tlb here since it's always done above */
+ if (unlikely(CTX_VERSION(next_mmu_context) == 0))
+ next_mmu_context = FIRST_CTX;
+
+ return next_mmu_context;
+}
+
+void switch_mm(struct mm_struct *prev, struct mm_struct *next,
+ struct task_struct *tsk)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ /* If the process context we are swapping in has a different context
+ * generation then we have it should get a new generation/pid */
+ if (unlikely(CTX_VERSION(next->context) !=
+ CTX_VERSION(next_mmu_context)))
+ next->context = get_new_context();
+
+ /* Save the current pgd so the fast tlb handler can find it */
+ pgd_current = next->pgd;
+
+ /* Set the current context */
+ set_context(next->context);
+
+ local_irq_restore(flags);
+}
+
+/*
+ * After we have set current->mm to a new value, this activates
+ * the context for the new mm so we see the new mappings.
+ */
+void activate_mm(struct mm_struct *prev, struct mm_struct *next)
+{
+ next->context = get_new_context();
+ set_context(next->context);
+ pgd_current = next->pgd;
+}
+
+unsigned long get_pid_from_context(mm_context_t *context)
+{
+ return CTX_PID((*context));
+}
diff --git a/arch/nios2/mm/pgtable.c b/arch/nios2/mm/pgtable.c
new file mode 100644
index 000000000000..61e24a25f71a
--- /dev/null
+++ b/arch/nios2/mm/pgtable.c
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2009 Wind River Systems Inc
+ * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ *
+ * 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.
+ */
+
+#include <linux/mm.h>
+#include <linux/sched.h>
+
+#include <asm/pgtable.h>
+#include <asm/cpuinfo.h>
+
+/* pteaddr:
+ * ptbase | vpn* | zero
+ * 31-22 | 21-2 | 1-0
+ *
+ * *vpn is preserved on double fault
+ *
+ * tlbacc:
+ * IG |*flags| pfn
+ * 31-25|24-20 | 19-0
+ *
+ * *crwxg
+ *
+ * tlbmisc:
+ * resv |way |rd | we|pid |dbl|bad|perm|d
+ * 31-24 |23-20 |19 | 20|17-4|3 |2 |1 |0
+ *
+ */
+
+/*
+ * Initialize a new pgd / pmd table with invalid pointers.
+ */
+static void pgd_init(pgd_t *pgd)
+{
+ unsigned long *p = (unsigned long *) pgd;
+ int i;
+
+ for (i = 0; i < USER_PTRS_PER_PGD; i += 8) {
+ p[i + 0] = (unsigned long) invalid_pte_table;
+ p[i + 1] = (unsigned long) invalid_pte_table;
+ p[i + 2] = (unsigned long) invalid_pte_table;
+ p[i + 3] = (unsigned long) invalid_pte_table;
+ p[i + 4] = (unsigned long) invalid_pte_table;
+ p[i + 5] = (unsigned long) invalid_pte_table;
+ p[i + 6] = (unsigned long) invalid_pte_table;
+ p[i + 7] = (unsigned long) invalid_pte_table;
+ }
+}
+
+pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+ pgd_t *ret, *init;
+
+ ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
+ if (ret) {
+ init = pgd_offset(&init_mm, 0UL);
+ pgd_init(ret);
+ memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
+ (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
+ }
+
+ return ret;
+}
+
+void __init pagetable_init(void)
+{
+ /* Initialize the entire pgd. */
+ pgd_init(swapper_pg_dir);
+ pgd_init(swapper_pg_dir + USER_PTRS_PER_PGD);
+}
diff --git a/arch/nios2/mm/tlb.c b/arch/nios2/mm/tlb.c
new file mode 100644
index 000000000000..cf10326aab1c
--- /dev/null
+++ b/arch/nios2/mm/tlb.c
@@ -0,0 +1,275 @@
+/*
+ * Nios2 TLB handling
+ *
+ * Copyright (C) 2009, Wind River Systems Inc
+ * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+
+#include <asm/tlb.h>
+#include <asm/mmu_context.h>
+#include <asm/pgtable.h>
+#include <asm/cpuinfo.h>
+
+#define TLB_INDEX_MASK \
+ ((((1UL << (cpuinfo.tlb_ptr_sz - cpuinfo.tlb_num_ways_log2))) - 1) \
+ << PAGE_SHIFT)
+
+/* Used as illegal PHYS_ADDR for TLB mappings
+ */
+#define MAX_PHYS_ADDR 0
+
+static void get_misc_and_pid(unsigned long *misc, unsigned long *pid)
+{
+ *misc = RDCTL(CTL_TLBMISC);
+ *misc &= (TLBMISC_PID | TLBMISC_WAY);
+ *pid = *misc & TLBMISC_PID;
+}
+
+/*
+ * All entries common to a mm share an asid. To effectively flush these
+ * entries, we just bump the asid.
+ */
+void flush_tlb_mm(struct mm_struct *mm)
+{
+ if (current->mm == mm)
+ flush_tlb_all();
+ else
+ memset(&mm->context, 0, sizeof(mm_context_t));
+}
+
+/*
+ * This one is only used for pages with the global bit set so we don't care
+ * much about the ASID.
+ */
+void flush_tlb_one_pid(unsigned long addr, unsigned long mmu_pid)
+{
+ unsigned int way;
+ unsigned long org_misc, pid_misc;
+
+ pr_debug("Flush tlb-entry for vaddr=%#lx\n", addr);
+
+ /* remember pid/way until we return. */
+ get_misc_and_pid(&org_misc, &pid_misc);
+
+ WRCTL(CTL_PTEADDR, (addr >> PAGE_SHIFT) << 2);
+
+ for (way = 0; way < cpuinfo.tlb_num_ways; way++) {
+ unsigned long pteaddr;
+ unsigned long tlbmisc;
+ unsigned long pid;
+
+ tlbmisc = pid_misc | TLBMISC_RD | (way << TLBMISC_WAY_SHIFT);
+ WRCTL(CTL_TLBMISC, tlbmisc);
+ pteaddr = RDCTL(CTL_PTEADDR);
+ tlbmisc = RDCTL(CTL_TLBMISC);
+ pid = (tlbmisc >> TLBMISC_PID_SHIFT) & TLBMISC_PID_MASK;
+ if (((((pteaddr >> 2) & 0xfffff)) == (addr >> PAGE_SHIFT)) &&
+ pid == mmu_pid) {
+ unsigned long vaddr = CONFIG_NIOS2_IO_REGION_BASE +
+ ((PAGE_SIZE * cpuinfo.tlb_num_lines) * way) +
+ (addr & TLB_INDEX_MASK);
+ pr_debug("Flush entry by writing %#lx way=%dl pid=%ld\n",
+ vaddr, way, (pid_misc >> TLBMISC_PID_SHIFT));
+
+ WRCTL(CTL_PTEADDR, (vaddr >> 12) << 2);
+ tlbmisc = pid_misc | TLBMISC_WE |
+ (way << TLBMISC_WAY_SHIFT);
+ WRCTL(CTL_TLBMISC, tlbmisc);
+ WRCTL(CTL_TLBACC, (MAX_PHYS_ADDR >> PAGE_SHIFT));
+ }
+ }
+
+ WRCTL(CTL_TLBMISC, org_misc);
+}
+
+void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ unsigned long mmu_pid = get_pid_from_context(&vma->vm_mm->context);
+
+ while (start < end) {
+ flush_tlb_one_pid(start, mmu_pid);
+ start += PAGE_SIZE;
+ }
+}
+
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ while (start < end) {
+ flush_tlb_one(start);
+ start += PAGE_SIZE;
+ }
+}
+
+/*
+ * This one is only used for pages with the global bit set so we don't care
+ * much about the ASID.
+ */
+void flush_tlb_one(unsigned long addr)
+{
+ unsigned int way;
+ unsigned long org_misc, pid_misc;
+
+ pr_debug("Flush tlb-entry for vaddr=%#lx\n", addr);
+
+ /* remember pid/way until we return. */
+ get_misc_and_pid(&org_misc, &pid_misc);
+
+ WRCTL(CTL_PTEADDR, (addr >> PAGE_SHIFT) << 2);
+
+ for (way = 0; way < cpuinfo.tlb_num_ways; way++) {
+ unsigned long pteaddr;
+ unsigned long tlbmisc;
+
+ tlbmisc = pid_misc | TLBMISC_RD | (way << TLBMISC_WAY_SHIFT);
+ WRCTL(CTL_TLBMISC, tlbmisc);
+ pteaddr = RDCTL(CTL_PTEADDR);
+ tlbmisc = RDCTL(CTL_TLBMISC);
+
+ if ((((pteaddr >> 2) & 0xfffff)) == (addr >> PAGE_SHIFT)) {
+ unsigned long vaddr = CONFIG_NIOS2_IO_REGION_BASE +
+ ((PAGE_SIZE * cpuinfo.tlb_num_lines) * way) +
+ (addr & TLB_INDEX_MASK);
+
+ pr_debug("Flush entry by writing %#lx way=%dl pid=%ld\n",
+ vaddr, way, (pid_misc >> TLBMISC_PID_SHIFT));
+
+ tlbmisc = pid_misc | TLBMISC_WE |
+ (way << TLBMISC_WAY_SHIFT);
+ WRCTL(CTL_PTEADDR, (vaddr >> 12) << 2);
+ WRCTL(CTL_TLBMISC, tlbmisc);
+ WRCTL(CTL_TLBACC, (MAX_PHYS_ADDR >> PAGE_SHIFT));
+ }
+ }
+
+ WRCTL(CTL_TLBMISC, org_misc);
+}
+
+void dump_tlb_line(unsigned long line)
+{
+ unsigned int way;
+ unsigned long org_misc;
+
+ pr_debug("dump tlb-entries for line=%#lx (addr %08lx)\n", line,
+ line << (PAGE_SHIFT + cpuinfo.tlb_num_ways_log2));
+
+ /* remember pid/way until we return */
+ org_misc = (RDCTL(CTL_TLBMISC) & (TLBMISC_PID | TLBMISC_WAY));
+
+ WRCTL(CTL_PTEADDR, line << 2);
+
+ for (way = 0; way < cpuinfo.tlb_num_ways; way++) {
+ unsigned long pteaddr;
+ unsigned long tlbmisc;
+ unsigned long tlbacc;
+
+ WRCTL(CTL_TLBMISC, TLBMISC_RD | (way << TLBMISC_WAY_SHIFT));
+ pteaddr = RDCTL(CTL_PTEADDR);
+ tlbmisc = RDCTL(CTL_TLBMISC);
+ tlbacc = RDCTL(CTL_TLBACC);
+
+ if ((tlbacc << PAGE_SHIFT) != (MAX_PHYS_ADDR & PAGE_MASK)) {
+ pr_debug("-- way:%02x vpn:0x%08lx phys:0x%08lx pid:0x%02lx flags:%c%c%c%c%c\n",
+ way,
+ (pteaddr << (PAGE_SHIFT-2)),
+ (tlbacc << PAGE_SHIFT),
+ ((tlbmisc >> TLBMISC_PID_SHIFT) &
+ TLBMISC_PID_MASK),
+ (tlbacc & _PAGE_READ ? 'r' : '-'),
+ (tlbacc & _PAGE_WRITE ? 'w' : '-'),
+ (tlbacc & _PAGE_EXEC ? 'x' : '-'),
+ (tlbacc & _PAGE_GLOBAL ? 'g' : '-'),
+ (tlbacc & _PAGE_CACHED ? 'c' : '-'));
+ }
+ }
+
+ WRCTL(CTL_TLBMISC, org_misc);
+}
+
+void dump_tlb(void)
+{
+ unsigned int i;
+
+ for (i = 0; i < cpuinfo.tlb_num_lines; i++)
+ dump_tlb_line(i);
+}
+
+void flush_tlb_pid(unsigned long pid)
+{
+ unsigned int line;
+ unsigned int way;
+ unsigned long org_misc, pid_misc;
+
+ /* remember pid/way until we return */
+ get_misc_and_pid(&org_misc, &pid_misc);
+
+ for (line = 0; line < cpuinfo.tlb_num_lines; line++) {
+ WRCTL(CTL_PTEADDR, line << 2);
+
+ for (way = 0; way < cpuinfo.tlb_num_ways; way++) {
+ unsigned long pteaddr;
+ unsigned long tlbmisc;
+ unsigned long tlbacc;
+
+ tlbmisc = pid_misc | TLBMISC_RD |
+ (way << TLBMISC_WAY_SHIFT);
+ WRCTL(CTL_TLBMISC, tlbmisc);
+ pteaddr = RDCTL(CTL_PTEADDR);
+ tlbmisc = RDCTL(CTL_TLBMISC);
+ tlbacc = RDCTL(CTL_TLBACC);
+
+ if (((tlbmisc>>TLBMISC_PID_SHIFT) & TLBMISC_PID_MASK)
+ == pid) {
+ tlbmisc = pid_misc | TLBMISC_WE |
+ (way << TLBMISC_WAY_SHIFT);
+ WRCTL(CTL_TLBMISC, tlbmisc);
+ WRCTL(CTL_TLBACC,
+ (MAX_PHYS_ADDR >> PAGE_SHIFT));
+ }
+ }
+
+ WRCTL(CTL_TLBMISC, org_misc);
+ }
+}
+
+void flush_tlb_all(void)
+{
+ int i;
+ unsigned long vaddr = CONFIG_NIOS2_IO_REGION_BASE;
+ unsigned int way;
+ unsigned long org_misc, pid_misc, tlbmisc;
+
+ /* remember pid/way until we return */
+ get_misc_and_pid(&org_misc, &pid_misc);
+ pid_misc |= TLBMISC_WE;
+
+ /* Map each TLB entry to physcal address 0 with no-access and a
+ bad ptbase */
+ for (way = 0; way < cpuinfo.tlb_num_ways; way++) {
+ tlbmisc = pid_misc | (way << TLBMISC_WAY_SHIFT);
+ for (i = 0; i < cpuinfo.tlb_num_lines; i++) {
+ WRCTL(CTL_PTEADDR, ((vaddr) >> PAGE_SHIFT) << 2);
+ WRCTL(CTL_TLBMISC, tlbmisc);
+ WRCTL(CTL_TLBACC, (MAX_PHYS_ADDR >> PAGE_SHIFT));
+ vaddr += 1UL << 12;
+ }
+ }
+
+ /* restore pid/way */
+ WRCTL(CTL_TLBMISC, org_misc);
+}
+
+void set_mmu_pid(unsigned long pid)
+{
+ WRCTL(CTL_TLBMISC, (RDCTL(CTL_TLBMISC) & TLBMISC_WAY) |
+ ((pid & TLBMISC_PID_MASK) << TLBMISC_PID_SHIFT));
+}
diff --git a/arch/nios2/mm/uaccess.c b/arch/nios2/mm/uaccess.c
new file mode 100644
index 000000000000..7663e156ff4f
--- /dev/null
+++ b/arch/nios2/mm/uaccess.c
@@ -0,0 +1,163 @@
+/*
+ * 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) 2009, Wind River Systems Inc
+ * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ */
+
+#include <linux/export.h>
+#include <linux/uaccess.h>
+
+asm(".global __copy_from_user\n"
+ " .type __copy_from_user, @function\n"
+ "__copy_from_user:\n"
+ " movi r2,7\n"
+ " mov r3,r4\n"
+ " bge r2,r6,1f\n"
+ " xor r2,r4,r5\n"
+ " andi r2,r2,3\n"
+ " movi r7,3\n"
+ " beq r2,zero,4f\n"
+ "1: addi r6,r6,-1\n"
+ " movi r2,-1\n"
+ " beq r6,r2,3f\n"
+ " mov r7,r2\n"
+ "2: ldbu r2,0(r5)\n"
+ " addi r6,r6,-1\n"
+ " addi r5,r5,1\n"
+ " stb r2,0(r3)\n"
+ " addi r3,r3,1\n"
+ " bne r6,r7,2b\n"
+ "3:\n"
+ " addi r2,r6,1\n"
+ " ret\n"
+ "13:mov r2,r6\n"
+ " ret\n"
+ "4: andi r2,r4,1\n"
+ " cmpeq r2,r2,zero\n"
+ " beq r2,zero,7f\n"
+ "5: andi r2,r3,2\n"
+ " beq r2,zero,6f\n"
+ "9: ldhu r2,0(r5)\n"
+ " addi r6,r6,-2\n"
+ " addi r5,r5,2\n"
+ " sth r2,0(r3)\n"
+ " addi r3,r3,2\n"
+ "6: bge r7,r6,1b\n"
+ "10:ldw r2,0(r5)\n"
+ " addi r6,r6,-4\n"
+ " addi r5,r5,4\n"
+ " stw r2,0(r3)\n"
+ " addi r3,r3,4\n"
+ " br 6b\n"
+ "7: ldbu r2,0(r5)\n"
+ " addi r6,r6,-1\n"
+ " addi r5,r5,1\n"
+ " addi r3,r4,1\n"
+ " stb r2,0(r4)\n"
+ " br 5b\n"
+ ".section __ex_table,\"a\"\n"
+ ".word 2b,3b\n"
+ ".word 9b,13b\n"
+ ".word 10b,13b\n"
+ ".word 7b,13b\n"
+ ".previous\n"
+ );
+EXPORT_SYMBOL(__copy_from_user);
+
+asm(
+ " .global __copy_to_user\n"
+ " .type __copy_to_user, @function\n"
+ "__copy_to_user:\n"
+ " movi r2,7\n"
+ " mov r3,r4\n"
+ " bge r2,r6,1f\n"
+ " xor r2,r4,r5\n"
+ " andi r2,r2,3\n"
+ " movi r7,3\n"
+ " beq r2,zero,4f\n"
+ /* Bail if we try to copy zero bytes */
+ "1: addi r6,r6,-1\n"
+ " movi r2,-1\n"
+ " beq r6,r2,3f\n"
+ /* Copy byte by byte for small copies and if src^dst != 0 */
+ " mov r7,r2\n"
+ "2: ldbu r2,0(r5)\n"
+ " addi r5,r5,1\n"
+ "9: stb r2,0(r3)\n"
+ " addi r6,r6,-1\n"
+ " addi r3,r3,1\n"
+ " bne r6,r7,2b\n"
+ "3: addi r2,r6,1\n"
+ " ret\n"
+ "13:mov r2,r6\n"
+ " ret\n"
+ /* If 'to' is an odd address byte copy */
+ "4: andi r2,r4,1\n"
+ " cmpeq r2,r2,zero\n"
+ " beq r2,zero,7f\n"
+ /* If 'to' is not divideable by four copy halfwords */
+ "5: andi r2,r3,2\n"
+ " beq r2,zero,6f\n"
+ " ldhu r2,0(r5)\n"
+ " addi r5,r5,2\n"
+ "10:sth r2,0(r3)\n"
+ " addi r6,r6,-2\n"
+ " addi r3,r3,2\n"
+ /* Copy words */
+ "6: bge r7,r6,1b\n"
+ " ldw r2,0(r5)\n"
+ " addi r5,r5,4\n"
+ "11:stw r2,0(r3)\n"
+ " addi r6,r6,-4\n"
+ " addi r3,r3,4\n"
+ " br 6b\n"
+ /* Copy remaining bytes */
+ "7: ldbu r2,0(r5)\n"
+ " addi r5,r5,1\n"
+ " addi r3,r4,1\n"
+ "12: stb r2,0(r4)\n"
+ " addi r6,r6,-1\n"
+ " br 5b\n"
+ ".section __ex_table,\"a\"\n"
+ ".word 9b,3b\n"
+ ".word 10b,13b\n"
+ ".word 11b,13b\n"
+ ".word 12b,13b\n"
+ ".previous\n");
+EXPORT_SYMBOL(__copy_to_user);
+
+long strncpy_from_user(char *__to, const char __user *__from, long __len)
+{
+ int l = strnlen_user(__from, __len);
+ int is_zt = 1;
+
+ if (l > __len) {
+ is_zt = 0;
+ l = __len;
+ }
+
+ if (l == 0 || copy_from_user(__to, __from, l))
+ return -EFAULT;
+
+ if (is_zt)
+ l--;
+ return l;
+}
+
+long strnlen_user(const char __user *s, long n)
+{
+ long i;
+
+ for (i = 0; i < n; i++) {
+ char c;
+
+ if (get_user(c, s + i) == -EFAULT)
+ return 0;
+ if (c == 0)
+ return i + 1;
+ }
+ return n + 1;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 21:32:39 +0000