mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 20:42:39 +00:00
ec8c0446b6
Virtually index, physically tagged cache architectures can get away without cache flushing when forking. This patch adds a new cache flushing function flush_cache_dup_mm(struct mm_struct *) which for the moment I've implemented to do the same thing on all architectures except on MIPS where it's a no-op. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
#ifndef _M68K_CACHEFLUSH_H
|
|
#define _M68K_CACHEFLUSH_H
|
|
|
|
#include <linux/mm.h>
|
|
|
|
/* cache code */
|
|
#define FLUSH_I_AND_D (0x00000808)
|
|
#define FLUSH_I (0x00000008)
|
|
|
|
/*
|
|
* Cache handling functions
|
|
*/
|
|
|
|
static inline void flush_icache(void)
|
|
{
|
|
if (CPU_IS_040_OR_060)
|
|
asm volatile ( "nop\n"
|
|
" .chip 68040\n"
|
|
" cpusha %bc\n"
|
|
" .chip 68k");
|
|
else {
|
|
unsigned long tmp;
|
|
asm volatile ( "movec %%cacr,%0\n"
|
|
" or.w %1,%0\n"
|
|
" movec %0,%%cacr"
|
|
: "=&d" (tmp)
|
|
: "id" (FLUSH_I));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* invalidate the cache for the specified memory range.
|
|
* It starts at the physical address specified for
|
|
* the given number of bytes.
|
|
*/
|
|
extern void cache_clear(unsigned long paddr, int len);
|
|
/*
|
|
* push any dirty cache in the specified memory range.
|
|
* It starts at the physical address specified for
|
|
* the given number of bytes.
|
|
*/
|
|
extern void cache_push(unsigned long paddr, int len);
|
|
|
|
/*
|
|
* push and invalidate pages in the specified user virtual
|
|
* memory range.
|
|
*/
|
|
extern void cache_push_v(unsigned long vaddr, int len);
|
|
|
|
/* This is needed whenever the virtual mapping of the current
|
|
process changes. */
|
|
#define __flush_cache_all() \
|
|
({ \
|
|
if (CPU_IS_040_OR_060) \
|
|
__asm__ __volatile__("nop\n\t" \
|
|
".chip 68040\n\t" \
|
|
"cpusha %dc\n\t" \
|
|
".chip 68k"); \
|
|
else { \
|
|
unsigned long _tmp; \
|
|
__asm__ __volatile__("movec %%cacr,%0\n\t" \
|
|
"orw %1,%0\n\t" \
|
|
"movec %0,%%cacr" \
|
|
: "=&d" (_tmp) \
|
|
: "di" (FLUSH_I_AND_D)); \
|
|
} \
|
|
})
|
|
|
|
#define __flush_cache_030() \
|
|
({ \
|
|
if (CPU_IS_020_OR_030) { \
|
|
unsigned long _tmp; \
|
|
__asm__ __volatile__("movec %%cacr,%0\n\t" \
|
|
"orw %1,%0\n\t" \
|
|
"movec %0,%%cacr" \
|
|
: "=&d" (_tmp) \
|
|
: "di" (FLUSH_I_AND_D)); \
|
|
} \
|
|
})
|
|
|
|
#define flush_cache_all() __flush_cache_all()
|
|
|
|
#define flush_cache_vmap(start, end) flush_cache_all()
|
|
#define flush_cache_vunmap(start, end) flush_cache_all()
|
|
|
|
static inline void flush_cache_mm(struct mm_struct *mm)
|
|
{
|
|
if (mm == current->mm)
|
|
__flush_cache_030();
|
|
}
|
|
|
|
#define flush_cache_dup_mm(mm) flush_cache_mm(mm)
|
|
|
|
/* flush_cache_range/flush_cache_page must be macros to avoid
|
|
a dependency on linux/mm.h, which includes this file... */
|
|
static inline void flush_cache_range(struct vm_area_struct *vma,
|
|
unsigned long start,
|
|
unsigned long end)
|
|
{
|
|
if (vma->vm_mm == current->mm)
|
|
__flush_cache_030();
|
|
}
|
|
|
|
static inline void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
|
|
{
|
|
if (vma->vm_mm == current->mm)
|
|
__flush_cache_030();
|
|
}
|
|
|
|
|
|
/* Push the page at kernel virtual address and clear the icache */
|
|
/* RZ: use cpush %bc instead of cpush %dc, cinv %ic */
|
|
static inline void __flush_page_to_ram(void *vaddr)
|
|
{
|
|
if (CPU_IS_040_OR_060) {
|
|
__asm__ __volatile__("nop\n\t"
|
|
".chip 68040\n\t"
|
|
"cpushp %%bc,(%0)\n\t"
|
|
".chip 68k"
|
|
: : "a" (__pa(vaddr)));
|
|
} else {
|
|
unsigned long _tmp;
|
|
__asm__ __volatile__("movec %%cacr,%0\n\t"
|
|
"orw %1,%0\n\t"
|
|
"movec %0,%%cacr"
|
|
: "=&d" (_tmp)
|
|
: "di" (FLUSH_I));
|
|
}
|
|
}
|
|
|
|
#define flush_dcache_page(page) __flush_page_to_ram(page_address(page))
|
|
#define flush_dcache_mmap_lock(mapping) do { } while (0)
|
|
#define flush_dcache_mmap_unlock(mapping) do { } while (0)
|
|
#define flush_icache_page(vma, page) __flush_page_to_ram(page_address(page))
|
|
|
|
extern void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
|
|
unsigned long addr, int len);
|
|
extern void flush_icache_range(unsigned long address, unsigned long endaddr);
|
|
|
|
static inline void copy_to_user_page(struct vm_area_struct *vma,
|
|
struct page *page, unsigned long vaddr,
|
|
void *dst, void *src, int len)
|
|
{
|
|
flush_cache_page(vma, vaddr, page_to_pfn(page));
|
|
memcpy(dst, src, len);
|
|
flush_icache_user_range(vma, page, vaddr, len);
|
|
}
|
|
static inline void copy_from_user_page(struct vm_area_struct *vma,
|
|
struct page *page, unsigned long vaddr,
|
|
void *dst, void *src, int len)
|
|
{
|
|
flush_cache_page(vma, vaddr, page_to_pfn(page));
|
|
memcpy(dst, src, len);
|
|
}
|
|
|
|
#endif /* _M68K_CACHEFLUSH_H */
|