270 lines
6.8 KiB
C
270 lines
6.8 KiB
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.
|
||
|
|
*
|
||
|
|
* 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__ (" 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);
|
||
|
|
|
||
|
|
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(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_dcache(start, end);
|
||
|
|
__flush_icache(start, end);
|
||
|
|
}
|
||
|
|
|
||
|
|
void flush_dcache_range(unsigned long start, unsigned long end)
|
||
|
|
{
|
||
|
|
__flush_dcache(start, end);
|
||
|
|
__flush_icache(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_dcache(start, end);
|
||
|
|
__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 address_space *mapping, struct page *page)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Writeback any data associated with the kernel mapping of this
|
||
|
|
* page. This ensures that data in the physical page is mutually
|
||
|
|
* coherent with the kernels mapping.
|
||
|
|
*/
|
||
|
|
unsigned long start = (unsigned long)page_address(page);
|
||
|
|
|
||
|
|
__flush_dcache(start, start + PAGE_SIZE);
|
||
|
|
}
|
||
|
|
|
||
|
|
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 {
|
||
|
|
__flush_dcache_page(mapping, page);
|
||
|
|
if (mapping) {
|
||
|
|
unsigned long start = (unsigned long)page_address(page);
|
||
|
|
flush_aliases(mapping, page);
|
||
|
|
flush_icache_range(start, start + PAGE_SIZE);
|
||
|
|
}
|
||
|
|
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;
|
||
|
|
struct address_space *mapping;
|
||
|
|
|
||
|
|
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;
|
||
|
|
|
||
|
|
mapping = page_mapping(page);
|
||
|
|
if (!test_and_set_bit(PG_dcache_clean, &page->flags))
|
||
|
|
__flush_dcache_page(mapping, page);
|
||
|
|
|
||
|
|
if(mapping)
|
||
|
|
{
|
||
|
|
flush_aliases(mapping, page);
|
||
|
|
if (vma->vm_flags & VM_EXEC)
|
||
|
|
flush_icache_page(vma, page);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
|
||
|
|
struct page *to)
|
||
|
|
{
|
||
|
|
__flush_dcache(vaddr, vaddr + PAGE_SIZE);
|
||
|
|
__flush_icache(vaddr, vaddr + PAGE_SIZE);
|
||
|
|
copy_page(vto, vfrom);
|
||
|
|
__flush_dcache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
|
||
|
|
__flush_icache((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);
|
||
|
|
__flush_icache(vaddr, vaddr + PAGE_SIZE);
|
||
|
|
clear_page(addr);
|
||
|
|
__flush_dcache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
|
||
|
|
__flush_icache((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);
|
||
|
|
}
|