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vmm: rename DESTROY_FLAGS_NOSYNC and force hhdm mappings to use VMM_FLAGS_EXACT

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Matheus
2023-05-29 07:50:59 -03:00
parent 6761ca494b
commit 85dc9cffdf
2 changed files with 10 additions and 8 deletions
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kernel-src/include/kernel/vmm.h
+3
View File
@@ -19,6 +19,8 @@
#define VMM_ACTION_WRITE 2
#define VMM_ACTION_EXEC 4
#define VMM_DESTROY_FLAGS_NOSYNC 1
typedef struct {
vnode_t *node;
uintmax_t offset;
@@ -92,6 +94,7 @@ static inline int mmuflagstovnodeflags(mmuflags_t mmuflags) {
return flags;
}
void vmm_destroycontext(vmmcontext_t *context, int destroyrangeflags);
vmmcontext_t *vmm_fork(vmmcontext_t *oldcontext);
void *vmm_map(void *addr, size_t size, int flags, mmuflags_t mmuflags, void *private);
void vmm_unmap(void *addr, size_t size, int flags);
kernel-src/mm/vmm.c
+7 -8
View File
@@ -195,8 +195,6 @@ static void insertrange(vmmspace_t *space, vmmrange_t *newrange) {
}
}
#define DESTROY_FLAGS_NOSYNC 1
static void destroyrange(vmmcontext_t *context, vmmrange_t *range, uintmax_t _offset, size_t size, int flags) {
uintmax_t top = _offset + size;
__assert(!(range->flags & VMM_FLAGS_COPY)); // TODO unimplemented
@@ -207,7 +205,7 @@ static void destroyrange(vmmcontext_t *context, vmmrange_t *range, uintmax_t _of
if (physical == NULL)
continue;
if ((range->flags & VMM_FLAGS_FILE) && (range->flags & VMM_FLAGS_SHARED) && (flags & DESTROY_FLAGS_NOSYNC) == 0) {
if ((range->flags & VMM_FLAGS_FILE) && (range->flags & VMM_FLAGS_SHARED) && (flags & VMM_DESTROY_FLAGS_NOSYNC) == 0) {
VOP_LOCK(range->vnode);
__assert(VOP_MUNMAP(range->vnode, vaddr, range->offset + offset, mmuflagstovnodeflags(range->mmuflags), NULL) == 0); // XXX pass cred struct
VOP_UNLOCK(range->vnode);
@@ -532,7 +530,7 @@ vmmcontext_t *vmm_fork(vmmcontext_t *oldcontext) {
return newcontext;
error:
spinlock_release(&oldcontext->space.lock);
vmm_destroycontext(newcontext, DESTROY_FLAGS_NOSYNC);
vmm_destroycontext(newcontext, VMM_DESTROY_FLAGS_NOSYNC);
return NULL;
}
@@ -575,12 +573,13 @@ void vmm_init() {
for (uint64_t i = 0; i < pmm_liminemap.response->entry_count; ++i) {
struct limine_memmap_entry *e = pmm_liminemap.response->entries[i];
__assert(vmm_map(MAKE_HHDM(e->base), e->length, 0, ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_NOEXEC, NULL));
mmuflags_t mmuflags = ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_NOEXEC;
__assert(vmm_map(MAKE_HHDM(e->base), e->length, VMM_FLAGS_EXACT, mmuflags, NULL));
}
__assert(vmm_map(&_text_start, (uintptr_t)&_text_end - (uintptr_t)&_text_start, 0, ARCH_MMU_FLAGS_READ, NULL));
__assert(vmm_map(&_rodata_start, (uintptr_t)&_rodata_end - (uintptr_t)&_rodata_start, 0, ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_NOEXEC, NULL));
__assert(vmm_map(&_data_start, (uintptr_t)&_data_end - (uintptr_t)&_data_start, 0, ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_NOEXEC, NULL));
__assert(vmm_map(&_text_start, (uintptr_t)&_text_end - (uintptr_t)&_text_start, VMM_FLAGS_EXACT, ARCH_MMU_FLAGS_READ, NULL));
__assert(vmm_map(&_rodata_start, (uintptr_t)&_rodata_end - (uintptr_t)&_rodata_start, VMM_FLAGS_EXACT, ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_NOEXEC, NULL));
__assert(vmm_map(&_data_start, (uintptr_t)&_data_end - (uintptr_t)&_data_start, VMM_FLAGS_EXACT, ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_NOEXEC, NULL));
// null page
vmm_map(MAKE_HHDM(NULL), PAGE_SIZE, VMM_FLAGS_EXACT, ARCH_MMU_FLAGS_NOEXEC, NULL);