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map kernel pdpts at arch_mmu_init()

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Matheus
2022-07-24 20:46:59 -03:00
parent 607b82ed6c
commit 7cb207d0c3
1 changed files with 14 additions and 2 deletions
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src/arch/x86_64/mmu.c
+14 -2
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@@ -9,7 +9,7 @@
#include <string.h> #include <string.h>
#include <arch/cls.h> #include <arch/cls.h>
static volatile struct limine_kernel_address_request kaddrreq = { volatile struct limine_kernel_address_request kaddrreq = {
.id = LIMINE_KERNEL_ADDRESS_REQUEST, .id = LIMINE_KERNEL_ADDRESS_REQUEST,
.revision = 0 .revision = 0
}; };
@@ -101,8 +101,20 @@ void arch_mmu_init(){
arch_mmu_tableptr context; arch_mmu_tableptr context;
context = pmm_alloc(1); context = pmm_alloc(1);
memset(context, 0, PAGE_SIZE);
if(!context) _panic ("Out of memory", 0); if(!context) _panic ("Out of memory", 0);
memset(context, 0, PAGE_SIZE);
// make sure to have all the kernel memory point to something so they
// can be all equal
for(size_t i = 256; i < 512; ++i){
void* addr = pmm_alloc(1);
if(!addr) _panic("Out of memory", 0);
memset(addr, 0, PAGE_SIZE);
size_t entry;
changeentry(&entry, addr, ARCH_MMU_MAP_READ | ARCH_MMU_MAP_WRITE | ARCH_MMU_MAP_NOEXEC);
context[i] = entry;
}
// TODO use big pages (huge pages if processor supports it) for this // TODO use big pages (huge pages if processor supports it) for this