diff options
| -rw-r--r-- | accel/tcg/user-exec.c | 7 | ||||
| -rw-r--r-- | include/exec/cpu-all.h | 12 |
2 files changed, 19 insertions, 0 deletions
diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c index d95b875a6a..ab684a3ea2 100644 --- a/accel/tcg/user-exec.c +++ b/accel/tcg/user-exec.c @@ -598,6 +598,13 @@ int page_check_range(target_ulong start, target_ulong len, int flags) return ret; } +bool page_check_range_empty(target_ulong start, target_ulong last) +{ + assert(last >= start); + assert_memory_lock(); + return pageflags_find(start, last) == NULL; +} + void page_protect(tb_page_addr_t address) { PageFlagsNode *p; diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h index 472fe9ad9c..94f828b109 100644 --- a/include/exec/cpu-all.h +++ b/include/exec/cpu-all.h @@ -225,6 +225,18 @@ void page_reset_target_data(target_ulong start, target_ulong last); int page_check_range(target_ulong start, target_ulong len, int flags); /** + * page_check_range_empty: + * @start: first byte of range + * @last: last byte of range + * Context: holding mmap lock + * + * Return true if the entire range [@start, @last] is unmapped. + * The memory lock must be held so that the caller will can ensure + * the result stays true until a new mapping can be installed. + */ +bool page_check_range_empty(target_ulong start, target_ulong last); + +/** * page_get_target_data(address) * @address: guest virtual address * |