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| author | David Gibson <david@gibson.dropbear.id.au> | 2013-03-12 00:31:42 +0000 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2013-03-22 15:28:52 +0100 |
| commit | b344074642e58fc83635c38105f38b85fc086666 (patch) | |
| tree | b337d95844b19839e37d7dba706657e92731b2e3 /target-ppc/mmu-hash32.c | |
| parent | 57d0a39d98b0d0e4712e736084667bcb5aed3474 (diff) | |
| download | qemu-b344074642e58fc83635c38105f38b85fc086666.zip qemu-b344074642e58fc83635c38105f38b85fc086666.tar.gz qemu-b344074642e58fc83635c38105f38b85fc086666.tar.bz2 | |
mmu-hash*: Clean up PTE flags update
Currently the ppc_hash{32,64}_pte_update_flags() helper functions update a
PTE's referenced and changed bits as necessary to reflect the access. It
is somewhat long winded, though. This patch open codes them in their
(single) callers, in a simpler way.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-ppc/mmu-hash32.c')
| -rw-r--r-- | target-ppc/mmu-hash32.c | 39 |
1 files changed, 12 insertions, 27 deletions
diff --git a/target-ppc/mmu-hash32.c b/target-ppc/mmu-hash32.c index 6581d0f..314b7d1 100644 --- a/target-ppc/mmu-hash32.c +++ b/target-ppc/mmu-hash32.c @@ -274,31 +274,6 @@ static int ppc_hash32_direct_store(CPUPPCState *env, target_ulong sr, } } -static int ppc_hash32_pte_update_flags(struct mmu_ctx_hash32 *ctx, uint32_t *pte1p, - int ret, int rwx) -{ - int store = 0; - - /* Update page flags */ - if (!(*pte1p & HPTE32_R_R)) { - /* Update accessed flag */ - *pte1p |= HPTE32_R_R; - store = 1; - } - if (!(*pte1p & HPTE32_R_C)) { - if (rwx == 1 && ret == 0) { - /* Update changed flag */ - *pte1p |= HPTE32_R_C; - store = 1; - } else { - /* Force page fault for first write access */ - ctx->prot &= ~PAGE_WRITE; - } - } - - return store; -} - hwaddr get_pteg_offset32(CPUPPCState *env, hwaddr hash) { return (hash * HASH_PTEG_SIZE_32) & env->htab_mask; @@ -374,6 +349,7 @@ static int ppc_hash32_translate(CPUPPCState *env, struct mmu_ctx_hash32 *ctx, target_ulong sr; hwaddr pte_offset; ppc_hash_pte32_t pte; + uint32_t new_pte1; const int need_prot[] = {PAGE_READ, PAGE_WRITE, PAGE_EXEC}; assert((rwx == 0) || (rwx == 1) || (rwx == 2)); @@ -432,8 +408,17 @@ static int ppc_hash32_translate(CPUPPCState *env, struct mmu_ctx_hash32 *ctx, /* 8. Update PTE referenced and changed bits if necessary */ - if (ppc_hash32_pte_update_flags(ctx, &pte.pte1, 0, rwx) == 1) { - ppc_hash32_store_hpte1(env, pte_offset, pte.pte1); + new_pte1 = pte.pte1 | HPTE32_R_R; /* set referenced bit */ + if (rwx == 1) { + new_pte1 |= HPTE32_R_C; /* set changed (dirty) bit */ + } else { + /* Treat the page as read-only for now, so that a later write + * will pass through this function again to set the C bit */ + ctx->prot &= ~PAGE_WRITE; + } + + if (new_pte1 != pte.pte1) { + ppc_hash32_store_hpte1(env, pte_offset, new_pte1); } /* Keep the matching PTE informations */ |