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target-s390x: function to adjust the length wrt page boundary

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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>
This commit is contained in:
Aurelien Jarno 2015-06-13 00:45:50 +02:00 committed by Alexander Graf
parent 2e83c49626
commit d7ce6b7a0b
1 changed files with 11 additions and 0 deletions
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11
target-s390x/mem_helper.c
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@ -54,6 +54,17 @@ void tlb_fill(CPUState *cs, target_ulong addr, int is_write, int mmu_idx,
#define HELPER_LOG(x...) #define HELPER_LOG(x...)
#endif #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 #ifndef CONFIG_USER_ONLY
static void mvc_fast_memset(CPUS390XState *env, uint32_t l, uint64_t dest, static void mvc_fast_memset(CPUS390XState *env, uint32_t l, uint64_t dest,
uint8_t byte) uint8_t byte)