cache.c
3.73 KB
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/*
* Copyright (C) 2004-2006 Atmel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/highmem.h>
#include <linux/unistd.h>
#include <asm/cacheflush.h>
#include <asm/cachectl.h>
#include <asm/processor.h>
#include <asm/uaccess.h>
#include <asm/syscalls.h>
/*
* If you attempt to flush anything more than this, you need superuser
* privileges. The value is completely arbitrary.
*/
#define CACHEFLUSH_MAX_LEN 1024
void invalidate_dcache_region(void *start, size_t size)
{
unsigned long v, begin, end, linesz, mask;
linesz = boot_cpu_data.dcache.linesz;
mask = linesz - 1;
/* when first and/or last cachelines are shared, flush them
* instead of invalidating ... never discard valid data!
*/
begin = (unsigned long)start;
end = begin + size;
if (begin & mask) {
flush_dcache_line(start);
begin += linesz;
}
if (end & mask) {
flush_dcache_line((void *)end);
end &= ~mask;
}
/* remaining cachelines only need invalidation */
for (v = begin; v < end; v += linesz)
invalidate_dcache_line((void *)v);
flush_write_buffer();
}
void clean_dcache_region(void *start, size_t size)
{
unsigned long v, begin, end, linesz;
linesz = boot_cpu_data.dcache.linesz;
begin = (unsigned long)start & ~(linesz - 1);
end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
for (v = begin; v < end; v += linesz)
clean_dcache_line((void *)v);
flush_write_buffer();
}
void flush_dcache_region(void *start, size_t size)
{
unsigned long v, begin, end, linesz;
linesz = boot_cpu_data.dcache.linesz;
begin = (unsigned long)start & ~(linesz - 1);
end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
for (v = begin; v < end; v += linesz)
flush_dcache_line((void *)v);
flush_write_buffer();
}
void invalidate_icache_region(void *start, size_t size)
{
unsigned long v, begin, end, linesz;
linesz = boot_cpu_data.icache.linesz;
begin = (unsigned long)start & ~(linesz - 1);
end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
for (v = begin; v < end; v += linesz)
invalidate_icache_line((void *)v);
}
static inline void __flush_icache_range(unsigned long start, unsigned long end)
{
unsigned long v, linesz;
linesz = boot_cpu_data.dcache.linesz;
for (v = start; v < end; v += linesz) {
clean_dcache_line((void *)v);
invalidate_icache_line((void *)v);
}
flush_write_buffer();
}
/*
* This one is called after a module has been loaded.
*/
void flush_icache_range(unsigned long start, unsigned long end)
{
unsigned long linesz;
linesz = boot_cpu_data.dcache.linesz;
__flush_icache_range(start & ~(linesz - 1),
(end + linesz - 1) & ~(linesz - 1));
}
/*
* This one is called from __do_fault() and do_swap_page().
*/
void flush_icache_page(struct vm_area_struct *vma, struct page *page)
{
if (vma->vm_flags & VM_EXEC) {
void *v = page_address(page);
__flush_icache_range((unsigned long)v, (unsigned long)v + PAGE_SIZE);
}
}
asmlinkage int sys_cacheflush(int operation, void __user *addr, size_t len)
{
int ret;
if (len > CACHEFLUSH_MAX_LEN) {
ret = -EPERM;
if (!capable(CAP_SYS_ADMIN))
goto out;
}
ret = -EFAULT;
if (!access_ok(VERIFY_WRITE, addr, len))
goto out;
switch (operation) {
case CACHE_IFLUSH:
flush_icache_range((unsigned long)addr,
(unsigned long)addr + len);
ret = 0;
break;
default:
ret = -EINVAL;
}
out:
return ret;
}
void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
unsigned long vaddr, void *dst, const void *src,
unsigned long len)
{
memcpy(dst, src, len);
if (vma->vm_flags & VM_EXEC)
flush_icache_range((unsigned long)dst,
(unsigned long)dst + len);
}