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vmm: fix unmap

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Matheus
2023-07-11 23:01:35 -03:00
parent 1b7fb2b852
commit 255255af25
1 changed files with 13 additions and 12 deletions
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kernel-src/mm/vmm.c
+13 -12
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@@ -205,13 +205,13 @@ static void insertrange(vmmspace_t *space, vmmrange_t *newrange) {
}
static void destroyrange(vmmcontext_t *context, vmmrange_t *range, uintmax_t _offset, size_t size, int flags) {
static void destroyrange(vmmrange_t *range, uintmax_t _offset, size_t size, int flags) {
uintmax_t top = _offset + size;
__assert(!(range->flags & VMM_FLAGS_COPY)); // TODO unimplemented
for (uintmax_t offset = _offset; offset < top; offset += PAGE_SIZE) {
void *vaddr = (void *)((uintptr_t)range->start + offset);
void *physical = arch_mmu_getphysical(context->pagetable, vaddr);
void *physical = arch_mmu_getphysical(_cpu()->vmmctx->pagetable, vaddr);
if (physical == NULL)
continue;
@@ -223,7 +223,7 @@ static void destroyrange(vmmcontext_t *context, vmmrange_t *range, uintmax_t _of
__assert(VOP_MUNMAP(range->vnode, vaddr, range->offset + offset, mmuflagstovnodeflags(range->mmuflags) | (range->flags & VMM_FLAGS_SHARED ? V_FFLAGS_SHARED : 0), cred) == 0);
} else {
pmm_free(physical, 1);
arch_mmu_unmap(context->pagetable, vaddr);
arch_mmu_unmap(_cpu()->vmmctx->pagetable, vaddr);
}
}
@@ -231,11 +231,9 @@ static void destroyrange(vmmcontext_t *context, vmmrange_t *range, uintmax_t _of
VOP_RELEASE(range->vnode);
}
static void unmap(vmmcontext_t *context, void *address, size_t size) {
static void unmap(vmmspace_t *space, void *address, size_t size) {
void *top = (void *)((uintptr_t)address + size);
vmmspace_t *space = &context->space;
vmmrange_t *range = space->ranges;
while (range) {
__assert(range != space->ranges || range->prev == NULL);
void *rangetop = RANGE_TOP(range);
@@ -249,14 +247,14 @@ static void unmap(vmmcontext_t *context, void *address, size_t size) {
if (range->next)
range->next->prev = range->prev;
destroyrange(context, range, 0, range->size, 0);
destroyrange(range, 0, range->size, 0);
freerange(range);
} else if (address > range->start && top < rangetop) { // split
vmmrange_t *new = allocrange();
__assert(new); // XXX deal with this better
*new = *range;
destroyrange(context, range, (uintptr_t)address - (uintptr_t)range->start, size, 0);
destroyrange(range, (uintptr_t)address - (uintptr_t)range->start, size, 0);
new->start = top;
new->size = (uintptr_t)rangetop - (uintptr_t)new->start;
@@ -271,7 +269,7 @@ static void unmap(vmmcontext_t *context, void *address, size_t size) {
}
} else if (top > range->start && range->start >= address) { // partially unmap from start
size_t difference = (uintptr_t)top - (uintptr_t)range->start;
destroyrange(context, range, 0, difference, 0);
destroyrange(range, 0, difference, 0);
range->start = (void *)((uintptr_t)range->start + difference);
range->size -= difference;
@@ -280,7 +278,7 @@ static void unmap(vmmcontext_t *context, void *address, size_t size) {
} else if (address < rangetop && rangetop <= top){ // partially unmap from end
size_t difference = (uintptr_t)rangetop - (uintptr_t)address;
range->size -= difference;
destroyrange(context, range, range->size, difference, 0);
destroyrange(range, range->size, difference, 0);
}
range = range->next;
@@ -403,6 +401,10 @@ void *vmm_map(void *addr, volatile size_t size, int flags, mmuflags_t mmuflags,
// allocate to virtual memory
for (uintmax_t i = 0; i < size; i += PAGE_SIZE) {
void *allocated = pmm_alloc(1, PMM_SECTION_DEFAULT);
if (allocated == NULL) {
retaddr = NULL;
goto cleanup;
}
if (arch_mmu_map(_cpu()->vmmctx->pagetable, allocated, (void *)((uintptr_t)start + i), mmuflags) == false) {
for (uintmax_t j = 0; j < size; j += PAGE_SIZE) {
@@ -448,8 +450,7 @@ void vmm_unmap(void *addr, size_t size, int flags) {
return;
spinlock_acquire(&space->lock);
unmap(_cpu()->vmmctx, addr, size);
unmap(space, addr, size);
spinlock_release(&space->lock);
}