diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2018-06-26 17:50:41 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2018-06-26 17:50:41 +0100 |
| commit | 55df6fcf5476b44bc1b95554e686ab3e91d725c5 (patch) | |
| tree | fb36681917f253625bae410f6538a7f1a562a4ad /include | |
| parent | d29183d3c0174e248b31bb2ee58b889f7baa3cfe (diff) | |
tcg: Support MMU protection regions smaller than TARGET_PAGE_SIZE
Add support for MMU protection regions that are smaller than
TARGET_PAGE_SIZE. We do this by marking the TLB entry for those
pages with a flag TLB_RECHECK. This flag causes us to always
take the slow-path for accesses. In the slow path we can then
special case them to always call tlb_fill() again, so we have
the correct information for the exact address being accessed.
This change allows us to handle reading and writing from small
regions; we cannot deal with execution from the small region.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180620130619.11362-2-peter.maydell@linaro.org
Diffstat (limited to 'include')
| -rw-r--r-- | include/exec/cpu-all.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h index 7fa726b8e3..7338f57062 100644 --- a/include/exec/cpu-all.h +++ b/include/exec/cpu-all.h @@ -330,11 +330,14 @@ CPUArchState *cpu_copy(CPUArchState *env); #define TLB_NOTDIRTY (1 << (TARGET_PAGE_BITS - 2)) /* Set if TLB entry is an IO callback. */ #define TLB_MMIO (1 << (TARGET_PAGE_BITS - 3)) +/* Set if TLB entry must have MMU lookup repeated for every access */ +#define TLB_RECHECK (1 << (TARGET_PAGE_BITS - 4)) /* Use this mask to check interception with an alignment mask * in a TCG backend. */ -#define TLB_FLAGS_MASK (TLB_INVALID_MASK | TLB_NOTDIRTY | TLB_MMIO) +#define TLB_FLAGS_MASK (TLB_INVALID_MASK | TLB_NOTDIRTY | TLB_MMIO \ + | TLB_RECHECK) void dump_exec_info(FILE *f, fprintf_function cpu_fprintf); void dump_opcount_info(FILE *f, fprintf_function cpu_fprintf); |