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vmm: page fault handling

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Matheus
2023-04-16 21:58:00 -03:00
parent 61ad248b72
commit 57d8dd3ae3
3 changed files with 78 additions and 1 deletions
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kernel-src/arch/x86-64/mmu.c
+21
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@@ -3,6 +3,8 @@
#include <kernel/pmm.h>
#include <string.h>
#include <logging.h>
#include <kernel/interrupt.h>
#include <kernel/vmm.h>
#define ADDRMASK (uint64_t)0x7ffffffffffff000
#define PTMASK (uint64_t)0b111111111000000000000
@@ -186,6 +188,24 @@ static volatile struct limine_kernel_address_request kaddrreq = {
.revision = 0
};
#define ERROR_PRESENT 1
#define ERROR_WRITE 2
#define ERROR_FETCH 16
static void pfisr(isr_t *self, context_t *ctx) {
int vmmerror = 0;
if (ctx->error & ERROR_PRESENT)
vmmerror |= VMM_ACTION_READ;
if (ctx->error & ERROR_WRITE)
vmmerror |= VMM_ACTION_WRITE;
if (ctx->error & ERROR_FETCH)
vmmerror |= VMM_ACTION_EXEC;
__assert(vmm_pagefault((void *)ctx->cr2, ctx->cs == 8, vmmerror));
}
void arch_mmu_init() {
template = pmm_alloc(1, PMM_SECTION_DEFAULT);
__assert(template);
@@ -226,4 +246,5 @@ void arch_mmu_init() {
}
arch_mmu_switch(FROM_HHDM(template));
interrupt_register(14, pfisr, NULL, 0); // FIXME still haven't decided if priorities grow up or down. should be max priority
}