linux/include/asm-alpha/cacheflush.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

75 lines
2.5 KiB
C

#ifndef _ALPHA_CACHEFLUSH_H
#define _ALPHA_CACHEFLUSH_H
#include <linux/config.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 */