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| author | Aurelien Jarno <aurelien@aurel32.net> | 2015-06-13 00:45:50 +0200 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2015-06-17 12:40:51 +0200 |
| commit | d7ce6b7a0ba4328a286d09d96395a8fc2fd6943c (patch) | |
| tree | 2145aa83f031c2f1c79d01df396d353801474edc /target-s390x/mem_helper.c | |
| parent | 2e83c496261c799b0fe6b8e18ac80cdc0a5c97ce (diff) | |
| download | qemu-d7ce6b7a0ba4328a286d09d96395a8fc2fd6943c.zip qemu-d7ce6b7a0ba4328a286d09d96395a8fc2fd6943c.tar.gz qemu-d7ce6b7a0ba4328a286d09d96395a8fc2fd6943c.tar.bz2 | |
target-s390x: function to adjust the length wrt page boundary
This patch adds a function to adjust the length of a transfer so that
it doesn't cross a page boundary in softmmu mode. It does nothing in
user mode.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-s390x/mem_helper.c')
| -rw-r--r-- | target-s390x/mem_helper.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/target-s390x/mem_helper.c b/target-s390x/mem_helper.c index b4e5d44..b8d3a5f 100644 --- a/target-s390x/mem_helper.c +++ b/target-s390x/mem_helper.c @@ -54,6 +54,17 @@ void tlb_fill(CPUState *cs, target_ulong addr, int is_write, int mmu_idx, #define HELPER_LOG(x...) #endif +/* Reduce the length so that addr + len doesn't cross a page boundary. */ +static inline uint64_t adj_len_to_page(uint64_t len, uint64_t addr) +{ +#ifndef CONFIG_USER_ONLY + if ((addr & ~TARGET_PAGE_MASK) + len - 1 >= TARGET_PAGE_SIZE) { + return -addr & ~TARGET_PAGE_MASK; + } +#endif + return len; +} + #ifndef CONFIG_USER_ONLY static void mvc_fast_memset(CPUS390XState *env, uint32_t l, uint64_t dest, uint8_t byte) |