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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/mm/vmm.c
+52 -1
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@@ -4,6 +4,7 @@
#include <util.h>
#include <arch/cpu.h>
#include <limine.h>
#include <string.h>
#define RANGE_TOP(x) (void *)((uintptr_t)x->start + x->size)
@@ -161,6 +162,55 @@ static void insertrange(vmmspace_t *space, vmmrange_t *newrange) {
newrange->next = NULL;
}
bool vmm_pagefault(void *addr, bool user, int actions) {
if (user == false)
return false;
addr = (void *)ROUND_DOWN((uintptr_t)addr, PAGE_SIZE);
vmmspace_t *space = getspace(addr);
if (space == NULL || (space == &kernelspace && user))
return false;
// TODO lock
vmmrange_t *range = getrange(space, addr);
bool status = false;
if (range == NULL)
goto cleanup;
// check if valid
int invalidactions = 0;
if ((range->mmuflags & ARCH_MMU_FLAG_READ) == 0)
invalidactions |= VMM_ACTION_READ;
if ((range->mmuflags & ARCH_MMU_FLAG_WRITE) == 0)
invalidactions |= VMM_ACTION_WRITE;
if ((range->mmuflags & ARCH_MMU_FLAG_NOEXEC))
invalidactions |= VMM_ACTION_EXEC;
if (invalidactions & actions)
goto cleanup;
// TODO file/CoW
void *paddr = pmm_alloc(1, PMM_SECTION_DEFAULT);
__assert(paddr); // XXX handle these better than an assert once there are signals and such
__assert(arch_mmu_map(_cpu()->vmmctx->pagetable, paddr, addr, range->mmuflags));
memset(addr, 0, PAGE_SIZE);
status = true;
cleanup:
// TODO unlock
return status;
}
void *vmm_map(void *addr, volatile size_t size, int flags, mmuflags_t mmuflags, void *private) {
addr = (void *)ROUND_DOWN((uintptr_t)addr, PAGE_SIZE);
if (flags & VMM_FLAGS_PAGESIZE)
@@ -220,6 +270,7 @@ void *vmm_map(void *addr, volatile size_t size, int flags, mmuflags_t mmuflags,
goto cleanup;
}
memset(MAKE_HHDM(allocated), 0, PAGE_SIZE);
}
}
@@ -250,7 +301,7 @@ static void printspace(vmmspace_t *space) {
printf("vmm: ranges:\n");
vmmrange_t *range = space->ranges;
while (range) {
printf("vmm: address %p size %p flags %p\n", range->start, range->size, range->flags);
printf("vmm: address %p size %lx flags %x\n", range->start, range->size, range->flags);
range = range->next;
}
}