mirror of
https://github.com/torvalds/linux.git
synced 2024-10-31 17:21:49 +00:00
74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
|
#ifndef _ALPHA_CACHEFLUSH_H
|
||
|
|
#define _ALPHA_CACHEFLUSH_H
|
||
|
|
|
||
|
|
#include <linux/mm.h>
|
||
|
|
|
||
|
|
/* Caches aren't brain-dead on the Alpha. */
|
||
|
|
#define flush_cache_all() do { } while (0)
|
||
|
|
#define flush_cache_mm(mm) do { } while (0)
|
||
|
|
#define flush_cache_range(vma, start, end) do { } while (0)
|
||
|
|
#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
|
||
|
|
#define flush_dcache_page(page) do { } while (0)
|
||
|
|
#define flush_dcache_mmap_lock(mapping) do { } while (0)
|
||
|
|
#define flush_dcache_mmap_unlock(mapping) do { } while (0)
|
||
|
|
#define flush_cache_vmap(start, end) do { } while (0)
|
||
|
|
#define flush_cache_vunmap(start, end) do { } while (0)
|
||
|
|
|
||
|
|
/* Note that the following two definitions are _highly_ dependent
|
||
|
|
on the contexts in which they are used in the kernel. I personally
|
||
|
|
think it is criminal how loosely defined these macros are. */
|
||
|
|
|
||
|
|
/* We need to flush the kernel's icache after loading modules. The
|
||
|
|
only other use of this macro is in load_aout_interp which is not
|
||
|
|
used on Alpha.
|
||
|
|
|
||
|
|
Note that this definition should *not* be used for userspace
|
||
|
|
icache flushing. While functional, it is _way_ overkill. The
|
||
|
|
icache is tagged with ASNs and it suffices to allocate a new ASN
|
||
|
|
for the process. */
|
||
|
|
#ifndef CONFIG_SMP
|
||
|
|
#define flush_icache_range(start, end) imb()
|
||
|
|
#else
|
||
|
|
#define flush_icache_range(start, end) smp_imb()
|
||
|
|
extern void smp_imb(void);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* We need to flush the userspace icache after setting breakpoints in
|
||
|
|
ptrace.
|
||
|
|
|
||
|
|
Instead of indiscriminately using imb, take advantage of the fact
|
||
|
|
that icache entries are tagged with the ASN and load a new mm context. */
|
||
|
|
/* ??? Ought to use this in arch/alpha/kernel/signal.c too. */
|
||
|
|
|
||
|
|
#ifndef CONFIG_SMP
|
||
|
|
extern void __load_new_mm_context(struct mm_struct *);
|
||
|
|
static inline void
|
||
|
|
flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
|
||
|
|
unsigned long addr, int len)
|
||
|
|
{
|
||
|
|
if (vma->vm_flags & VM_EXEC) {
|
||
|
|
struct mm_struct *mm = vma->vm_mm;
|
||
|
|
if (current->active_mm == mm)
|
||
|
|
__load_new_mm_context(mm);
|
||
|
|
else
|
||
|
|
mm->context[smp_processor_id()] = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
extern void flush_icache_user_range(struct vm_area_struct *vma,
|
||
|
|
struct page *page, unsigned long addr, int len);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* This is used only in do_no_page and do_swap_page. */
|
||
|
|
#define flush_icache_page(vma, page) \
|
||
|
|
flush_icache_user_range((vma), (page), 0, 0)
|
||
|
|
|
||
|
|
#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
|
||
|
|
do { memcpy(dst, src, len); \
|
||
|
|
flush_icache_user_range(vma, page, vaddr, len); \
|
||
|
|
} while (0)
|
||
|
|
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
|
||
|
|
memcpy(dst, src, len)
|
||
|
|
|
||
|
|
#endif /* _ALPHA_CACHEFLUSH_H */
|