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sh: TLB miss fast-path optimizations.

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Handle simple TLB miss faults which can be resolved completely
from the page table in assembler.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Stuart Menefy
2006-11-24 11:42:24 +09:00
committed by Paul Mundt
parent 9daa0c257d
commit 9b3a53ab76
6 changed files with 204 additions and 117 deletions
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6
include/asm-sh/pgtable.h
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@@ -43,12 +43,12 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
/* PGD bits */
#define PGDIR_SHIFT (PTE_SHIFT + PTE_BITS)
#define PGDIR_BITS (32 - PGDIR_SHIFT)
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_SIZE (1 << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
/* Entries per level */
#define PTRS_PER_PTE (1UL << PTE_BITS)
#define PTRS_PER_PGD (1UL << PGDIR_BITS)
#define PTRS_PER_PTE (1 << PTE_BITS)
#define PTRS_PER_PGD (1 << PGDIR_BITS)
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0