-#include <libc/string.h>
+#include <klibc/string.h>
#include <lunaix/mm/page.h>
-#include <lunaix/mm/pmm.h>
-#include <lunaix/mm/vmm.h>
-#include <lunaix/assert.h>
-#include <hal/cpu.h>
+#include <lunaix/spike.h>
+#include <lunaix/syslog.h>
-void
-vmm_init()
-{
- // TODO: something here?
-}
-
-ptd_t*
-vmm_init_pd()
-{
- ptd_t* dir = pmm_alloc_page();
- for (size_t i = 0; i < PG_MAX_ENTRIES; i++) {
- dir[i] = 0;
- }
-
- // 递归映射，方便我们在软件层面进行查表地址转换
- dir[PG_MAX_ENTRIES - 1] = NEW_L1_ENTRY(T_SELF_REF_PERM, dir);
-
- return dir;
-}
-
-int
-__vmm_map_internal(uint32_t l1_inx, uint32_t l2_inx, uintptr_t pa, pt_attr attr) {
- ptd_t* l1pt = (ptd_t*)L1_BASE_VADDR;
- pt_t* l2pt = (pt_t*)L2_VADDR(l1_inx);
-
- // See if attr make sense
- assert(attr <= 128);
-
- if(!l1pt[l1_inx]) {
- uint8_t* new_l1pt_pa = pmm_alloc_page();
+#include <asm/cpu.h>
+#include <asm/mm_defs.h>
- // 物理内存已满！
- if (!new_l1pt_pa) {
- return 0;
- }
+LOG_MODULE("VM")
- l1pt[l1_inx] = NEW_L1_ENTRY(attr, new_l1pt_pa);
- memset((void*)L2_VADDR(l1_inx), 0, PM_PAGE_SIZE);
- }
-
- l2pt[l2_inx] = NEW_L2_ENTRY(attr, pa);
-
- return 1;
-}
-
-void*
-vmm_map_page(void* va, void* pa, pt_attr tattr)
+pte_t
+vmm_tryptep(pte_t* ptep, size_t lvl_size)
{
- // 显然，对空指针进行映射没有意义。
- if (!pa || !va) {
- return NULL;
- }
-
- assert(((uintptr_t)va & 0xFFFU) == 0)
- assert(((uintptr_t)pa & 0xFFFU) == 0)
-
- uint32_t l1_index = L1_INDEX(va);
- uint32_t l2_index = L2_INDEX(va);
- ptd_t* l1pt = (ptd_t*)L1_BASE_VADDR;
-
- // 在页表与页目录中找到一个可用的空位进行映射（位于va或其附近）
- ptd_t l1pte = l1pt[l1_index];
- pt_t* l2pt = (pt_t*)L2_VADDR(l1_index);
- while (l1pte && l1_index < PG_MAX_ENTRIES) {
- if (l2_index == PG_MAX_ENTRIES) {
- l1_index++;
- l2_index = 0;
- l1pte = l1pt[l1_index];
- l2pt = (pt_t*)L2_VADDR(l1_index);
- }
- // 页表有空位，只需要开辟一个新的 PTE (Level 2)
- if (l2pt && !l2pt[l2_index]) {
- l2pt[l2_index] = NEW_L2_ENTRY(tattr, pa);
- return (void*)V_ADDR(l1_index, l2_index, PG_OFFSET(va));
- }
- l2_index++;
- }
-
- // 页目录与所有页表已满！
- if (l1_index > PG_MAX_ENTRIES) {
- return NULL;
- }
-
- if (!__vmm_map_internal(l1_index, l2_index, pa, tattr)) {
- return NULL;
- }
-
- return (void*)V_ADDR(l1_index, l2_index, PG_OFFSET(va));
+ ptr_t va = ptep_va(ptep, lvl_size);
+ pte_t* _ptep = mkl0tep(ptep);
+ pte_t pte;
+
+ if (pte_isnull(pte = *_ptep) || _ptep == ptep)
+ return pte;
+
+#if LnT_ENABLED(1)
+ _ptep = getl1tep(_ptep, va);
+ if (_ptep == ptep || pte_isnull(pte = *_ptep))
+ return pte;
+#endif
+#if LnT_ENABLED(2)
+ _ptep = getl2tep(_ptep, va);
+ if (_ptep == ptep || pte_isnull(pte = *_ptep))
+ return pte;
+#endif
+#if LnT_ENABLED(3)
+ _ptep = getl3tep(_ptep, va);
+ if (_ptep == ptep || pte_isnull(pte = *_ptep))
+ return pte;
+#endif
+ _ptep = getlftep(_ptep, va);
+ return *_ptep;
}
-void*
-vmm_fmap_page(void* va, void* pa, pt_attr tattr) {
- if (!pa || !va) {
- return NULL;
- }
-
- assert(((uintptr_t)va & 0xFFFU) == 0)
- assert(((uintptr_t)pa & 0xFFFU) == 0)
-
- uint32_t l1_index = L1_INDEX(va);
- uint32_t l2_index = L2_INDEX(va);
-
- if (!__vmm_map_internal(l1_index, l2_index, pa, tattr)) {
- return NULL;
- }
-
- cpu_invplg(va);
+ptr_t
+vms_mount(ptr_t mnt, ptr_t vms_root)
+{
+ assert(vms_root);
- return (void*)V_ADDR(l1_index, l2_index, PG_OFFSET(va));
+ pte_t* ptep = mkl0tep_va(VMS_SELF, mnt);
+ set_pte(ptep, mkpte(vms_root, KERNEL_PGTAB));
+ tlb_flush_kernel(mnt);
+ return mnt;
}
-void*
-vmm_alloc_page(void* vpn, pt_attr tattr)
+ptr_t
+vms_unmount(ptr_t mnt)
{
- void* pp = pmm_alloc_page();
- void* result = vmm_map_page(vpn, pp, tattr);
- if (!result) {
- pmm_free_page(pp);
- }
- return result;
+ pte_t* ptep = mkl0tep_va(VMS_SELF, mnt);
+ set_pte(ptep, null_pte);
+ tlb_flush_kernel(mnt);
+ return mnt;
}
+
void
-vmm_unmap_page(void* va)
+ptep_alloc_hierarchy(pte_t* ptep, ptr_t va, pte_attr_t prot)
{
- assert(((uintptr_t)va & 0xFFFU) == 0)
-
- uint32_t l1_index = L1_INDEX(va);
- uint32_t l2_index = L2_INDEX(va);
- ptd_t* l1pt = (ptd_t*)L1_BASE_VADDR;
-
- ptd_t l1pte = l1pt[l1_index];
-
- if (l1pte) {
- pt_t* l2pt = (pt_t*)L2_VADDR(l1_index);
- uint32_t l2pte = l2pt[l2_index];
- if (IS_CACHED(l2pte) && pmm_free_page((void*)l2pte)) {
- cpu_invplg(va);
- }
- l2pt[l2_index] = 0;
+ pte_t* _ptep;
+
+ _ptep = mkl0tep(ptep);
+ if (_ptep == ptep) {
+ return;
}
-}
-v_mapping
-vmm_lookup(void* va)
-{
- assert(((uintptr_t)va & 0xFFFU) == 0)
-
- uint32_t l1_index = L1_INDEX(va);
- uint32_t l2_index = L2_INDEX(va);
- uint32_t po = PG_OFFSET(va);
- ptd_t* l1pt = (ptd_t*)L1_BASE_VADDR;
-
- ptd_t l1pte = l1pt[l1_index];
+ _ptep = mkl1t(_ptep, va, prot);
+ if (_ptep == ptep) {
+ return;
+ }
- v_mapping mapping = { .flags = 0, .pa = 0, .pn = 0 };
- if (l1pte) {
- pt_t l2pte = ((pt_t*)L2_VADDR(l1_index))[l2_index];
- if (l2pte) {
- uintptr_t ppn = l2pte >> PG_SIZE_BITS;
- mapping.flags = PG_ENTRY_FLAGS(l2pte);
- mapping.pa = PG_ENTRY_ADDR(l2pte);
- mapping.pn = mapping.pa >> PG_SIZE_BITS;
- }
+ _ptep = mkl2t(_ptep, va, prot);
+ if (_ptep == ptep) {
+ return;
}
- return mapping;
-}
+ _ptep = mkl3t(_ptep, va, prot);
+ if (_ptep == ptep) {
+ return;
+ }
-void*
-vmm_v2p(void* va) {
- return vmm_lookup(va).pa;
+ _ptep = mklft(_ptep, va, prot);
+ assert(_ptep == ptep);
}
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff