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pmm: Sanitise away usable entry parts below 0x1000

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This commit is contained in:
mintsuki 2021-10-31 21:25:13 +01:00
parent 7619908d1a
commit b5eea0cc60
1 changed files with 11 additions and 1 deletions
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12
stage23/mm/pmm.s2.c
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@ -167,12 +167,22 @@ static void sanitise_entries(struct e820_entry_t *m, size_t *_count, bool align_
}
}
// Remove 0 length usable entries
// Remove 0 length usable entries and usable entries below 0x1000
for (size_t i = 0; i < count; i++) {
if (m[i].type != MEMMAP_USABLE)
continue;
if (m[i].base < 0x1000) {
if (m[i].base + m[i].length <= 0x1000) {
goto del_mm1;
}
m[i].length -= 0x1000 - m[i].base;
m[i].base = 0x1000;
}
if (m[i].length == 0) {
del_mm1:
// Eradicate from memmap
for (size_t j = i + 1; j < count; j++) {
m[j - 1] = m[j];