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Merge pull request #542 from sandrine-bailleux-arm/km/pt-zero

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Initialize all translation table entries
This commit is contained in:
danh-arm 2016-03-11 04:45:32 +00:00
commit a25648e079
1 changed files with 16 additions and 3 deletions
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19
lib/aarch64/xlat_tables.c
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@ -52,7 +52,17 @@
#define debug_print(...) ((void)0)
#endif
CASSERT(ADDR_SPACE_SIZE > 0, assert_valid_addr_space_size);
#define IS_POWER_OF_TWO(x) (((x) & ((x) - 1)) == 0)
/*
* The virtual address space size must be a power of two (as set in TCR.T0SZ).
* As we start the initial lookup at level 1, it must also be between 2 GB and
* 512 GB (with the virtual address size therefore 31 to 39 bits). See section
* D4.2.5 in the ARMv8-A Architecture Reference Manual (DDI 0487A.i) for more
* information.
*/
CASSERT(ADDR_SPACE_SIZE >= (1ull << 31) && ADDR_SPACE_SIZE <= (1ull << 39) &&
IS_POWER_OF_TWO(ADDR_SPACE_SIZE), assert_valid_addr_space_size);
#define UNSET_DESC ~0ul
@ -229,7 +239,10 @@ static mmap_region_t *init_xlation_table(mmap_region_t *mm,
do {
unsigned long desc = UNSET_DESC;
if (mm->base_va + mm->size <= base_va) {
if (!mm->size) {
/* Done mapping regions; finish zeroing the table */
desc = INVALID_DESC;
} else if (mm->base_va + mm->size <= base_va) {
/* Area now after the region so skip it */
++mm;
continue;
@ -267,7 +280,7 @@ static mmap_region_t *init_xlation_table(mmap_region_t *mm,
*table++ = desc;
base_va += level_size;
} while (mm->size && (base_va & level_index_mask));
} while ((base_va & level_index_mask) && (base_va < ADDR_SPACE_SIZE));
return mm;
}