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pmm: Protect page 0 of physical memory

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This commit is contained in:
mintsuki 2021-04-15 03:44:25 +02:00
parent 8eda1e014a
commit 06315dd809
1 changed files with 21 additions and 3 deletions
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24
stage23/mm/pmm.s2.c
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@ -216,7 +216,18 @@ void init_memmap(void) {
panic("Memory map exhausted.");
}
memmap[memmap_entries++] = e820_map[i];
memmap[memmap_entries] = e820_map[i];
if (memmap[memmap_entries].base < 0x1000) {
if (memmap[memmap_entries].base + memmap[memmap_entries].length <= 0x1000) {
continue;
}
memmap[memmap_entries].length -= 0x1000 - memmap[memmap_entries].base;
memmap[memmap_entries].base = 0x1000;
}
memmap_entries++;
}
// Allocate bootloader itself
@ -226,8 +237,6 @@ void init_memmap(void) {
sanitise_entries(false);
allocations_disallowed = false;
print_memmap(memmap, memmap_entries);
}
#endif
@ -286,6 +295,15 @@ void init_memmap(void) {
memmap[memmap_entries].base = entry->PhysicalStart;
memmap[memmap_entries].length = entry->NumberOfPages * 4096;
if (memmap[memmap_entries].base < 0x1000) {
if (memmap[memmap_entries].base + memmap[memmap_entries].length <= 0x1000) {
continue;
}
memmap[memmap_entries].length -= 0x1000 - memmap[memmap_entries].base;
memmap[memmap_entries].base = 0x1000;
}
memmap_entries++;
}