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vmm: some work towards page locking

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Matheus
2026-02-12 16:25:35 -03:00
parent 3e2a64be5d
commit b3d5bf5586
6 changed files with 56 additions and 7 deletions
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kernel-src/mm/vmm.c
+47 -3
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@@ -694,7 +694,43 @@ bool vmm_pagefault(void *addr, bool user, int actions) {
return status;
}
void *vmm_getphysical(void *addr, bool hold) {
/*
static int lock_page(vmmspace_t *space, void *vaddr) {
vmmrange_t *range = getrange(space, vaddr);
if (!range)
return ENOENT;
void *mapped_address = arch_mmu_getphysical(current_vmm_context()->pagetable, vaddr);
bool present = arch_mmu_ispresent(current_vmm_context()->pagetable, vaddr);
bool writable = arch_mmu_iswritable(current_vmm_context()->pagetable, vaddr);
bool file_mapping = range->flags & VMM_FLAGS_FILE;
bool private = (range->flags & VMM_FLAGS_SHARED) == 0 || file_mapping == false;
void *real_phys;
// TODO anon with refcount == 1 can go into another cas
// TODO read-only permission checking for DMA
// TODO shared anonymous mappings are not handled properly by the kernel
if (present && writable == false && private)) {
// CoW cases (private mapping)
real_phys = pmm_allocpage(PMM_SECTION_DEFAULT);
if (real_phys == NULL)
return ENOMEM;
memcpy(MAKE_HHDM(real_phys), MAKE_HHDM(mapped_address), PAGE_SIZE);
arch_mmu_remap(current_vmm_context()->pagetable, real_phys, vaddr, range->mmuflags);
arch_mmu_invalidate_range(vaddr, PAGE_SIZE);
if (file_mapping == false || vfs_iscacheable(range->vnode))
pmm_release(mapped_address);
} else if (present == false && private) {
// not present private mapping case
real_phys = pmm_allocpage(PMM_SECTION_DEFAULT);
if (real_phys == NULL)
}
}
*/
void *vmm_getphysical(void *addr, int flags) {
void *aligned_addr = (void *)ROUND_DOWN((uintptr_t)addr, PAGE_SIZE);
vmmspace_t *space = getspace(aligned_addr);
@@ -703,11 +739,19 @@ void *vmm_getphysical(void *addr, bool hold) {
MUTEX_ACQUIRE(&space->lock);
void *physical = arch_mmu_getphysical(current_vmm_context()->pagetable, aligned_addr);
void *physical;
/*
if ((flags & VMM_GET_PHYSICAL_FLAGS_LOCK) && lock_page(space, aligned_addrr)) {
physical = NULL;
goto leave;
}*/
if (hold)
physical = arch_mmu_getphysical(current_vmm_context()->pagetable, aligned_addr);
if (flags & VMM_GET_PHYSICAL_FLAGS_HOLD)
pmm_hold(physical);
leave:
MUTEX_RELEASE(&space->lock);
return physical + ((uintptr_t)addr - (uintptr_t)aligned_addr);
}