diff options
| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2009-02-26 19:11:51 +0000 |
|---|---|---|
| committer | Thomas Schwinge <tschwinge@gnu.org> | 2009-06-18 00:27:22 +0200 |
| commit | e227045b06d62ee7d2fbab9d5ade9030ff43170b (patch) | |
| tree | ad24520c0298d58bd62f0e2776875bce20cb398f /i386 | |
| parent | 7a89d69cb22bb897100c9acc3d3bde0d36f60a98 (diff) | |
2009-02-26 Samuel Thibault <samuel.thibault@ens-lyon.org>
* i386/i386/prog_reg.h (invlpg_linear): Rename macro into...
(invlpg_linear_range): ... this.
(invlpg_linear): New macro.
* i386/intel/pmap.c (INVALIDATE_TLB): Call invlpg_linear instead
of flush_tlb when e - S is compile-time known to be PAGE_SIZE,
instead of run-time known to be less than 32 * PAGE_SIZE.
Diffstat (limited to 'i386')
| -rw-r--r-- | i386/i386/proc_reg.h | 11 | ||||
| -rw-r--r-- | i386/intel/pmap.c | 9 |
2 files changed, 16 insertions, 4 deletions
diff --git a/i386/i386/proc_reg.h b/i386/i386/proc_reg.h index 11a21cf..d9f32bc 100644 --- a/i386/i386/proc_reg.h +++ b/i386/i386/proc_reg.h @@ -142,7 +142,16 @@ set_eflags(unsigned eflags) asm volatile("invlpg (%0)" : : "r" (addr)); \ }) -#define invlpg_linear(start, end) \ +#define invlpg_linear(start) \ + ({ \ + asm volatile( \ + "movw %w1,%%es\n" \ + "\tinvlpg %%es:(%0)\n" \ + "\tmovw %w2,%%es" \ + :: "r" (start), "q" (LINEAR_DS), "q" (KERNEL_DS)); \ + }) + +#define invlpg_linear_range(start, end) \ ({ \ register unsigned long var = trunc_page(start); \ asm volatile( \ diff --git a/i386/intel/pmap.c b/i386/intel/pmap.c index d46f645..d57df92 100644 --- a/i386/intel/pmap.c +++ b/i386/intel/pmap.c @@ -332,11 +332,14 @@ lock_data_t pmap_system_lock; #define MAX_TBIS_SIZE 32 /* > this -> TBIA */ /* XXX */ #if 0 +/* It is hard to know when a TLB flush becomes less expensive than a bunch of + * invlpgs. But it surely is more expensive than just one invlpg. */ #define INVALIDATE_TLB(s, e) { \ - if (((e) - (s)) > 32 * PAGE_SIZE) \ - flush_tlb(); \ + if (__builtin_constant_p((e) - (s)) + && (e) - (s) == PAGE_SIZE) + invlpg_linear(s); \ else \ - invlpg_linear(s, e); \ + flush_tlb(); \ } #else #define INVALIDATE_TLB(s, e) flush_tlb() |