#include <sys/cpu.h>
#include <sys/mm/mm_defs.h>
-LOG_MODULE("VMM")
+LOG_MODULE("VM")
void
vmm_init()
// XXX: something here?
}
-x86_page_table*
-vmm_init_pd()
+pte_t
+vmm_alloc_page(pte_t* ptep, pte_t pte)
{
- x86_page_table* dir =
- (x86_page_table*)pmm_alloc_page(PP_FGPERSIST);
- for (size_t i = 0; i < PG_MAX_ENTRIES; i++) {
- dir->entry[i] = PTE_NULL;
+ ptr_t pa = pmm_alloc_page(PP_FGPERSIST);
+ if (!pa) {
+ return null_pte;
}
- // 递归映射，方便我们在软件层面进行查表地址转换
- dir->entry[PG_MAX_ENTRIES - 1] = NEW_L1_ENTRY(T_SELF_REF_PERM, dir);
+ pte = pte_setpaddr(pte, pa);
+ pte = pte_mkloaded(pte);
+ set_pte(ptep, pte);
- return dir;
+ mount_page(PG_MOUNT_1, pa);
+ memset((void*)PG_MOUNT_1, 0, LFT_SIZE);
+ unmount_page(PG_MOUNT_1);
+
+ cpu_flush_page((ptr_t)ptep);
+
+ return pte;
}
int
-vmm_set_mapping(ptr_t mnt, ptr_t va, ptr_t pa, pt_attr attr, int options)
+vmm_set_mapping(ptr_t mnt, ptr_t va, ptr_t pa, pte_attr_t prot)
{
- assert((ptr_t)va % PG_SIZE == 0);
-
- ptr_t l1_inx = L1_INDEX(va);
- ptr_t l2_inx = L2_INDEX(va);
- x86_page_table* l1pt = (x86_page_table*)(mnt | (1023 << 12));
- x86_page_table* l2pt = (x86_page_table*)(mnt | (l1_inx << 12));
-
- // See if attr make sense
- assert(attr <= 128);
-
- x86_pte_t* l1pte = &l1pt->entry[l1_inx];
- if (!*l1pte) {
- x86_page_table* new_l1pt_pa =
- (x86_page_table*)pmm_alloc_page(PP_FGPERSIST);
-
- // 物理内存已满！
- if (!new_l1pt_pa) {
- return 0;
- }
-
- // This must be writable
- *l1pte = NEW_L1_ENTRY(attr | PG_WRITE | PG_PRESENT, new_l1pt_pa);
-
- // make sure our new l2 table is visible to CPU
- cpu_flush_page((ptr_t)l2pt);
-
- memset((void*)l2pt, 0, PG_SIZE);
- } else {
- if ((attr & PG_ALLOW_USER) && !(*l1pte & PG_ALLOW_USER)) {
- *l1pte |= PG_ALLOW_USER;
- }
-
- x86_pte_t pte = l2pt->entry[l2_inx];
- if (pte && (options & VMAP_IGNORE)) {
- return 1;
- }
- }
+ assert(!va_offset(va));
- if (mnt == VMS_SELF) {
- cpu_flush_page(va);
- }
+ pte_t* ptep = mkptep_va(mnt, va);
+ pte_t pte = mkpte(pa, prot);
- if ((options & VMAP_NOMAP)) {
- return 1;
- }
+ set_pte(ptep, pte);
- if (!(options & VMAP_GUARDPAGE)) {
- l2pt->entry[l2_inx] = NEW_L2_ENTRY(attr, pa);
- } else {
- l2pt->entry[l2_inx] = MEMGUARD;
- }
-
return 1;
}
ptr_t
vmm_del_mapping(ptr_t mnt, ptr_t va)
{
- assert(((ptr_t)va & 0xFFFU) == 0);
-
- u32_t l1_index = L1_INDEX(va);
- u32_t l2_index = L2_INDEX(va);
-
- // prevent unmap of recursive mapping region
- if (l1_index == 1023) {
- return 0;
- }
+ assert(!va_offset(va));
- x86_page_table* l1pt = (x86_page_table*)(mnt | (1023 << 12));
+ pte_t* ptep = mkptep_va(mnt, va);
- x86_pte_t l1pte = l1pt->entry[l1_index];
-
- if (l1pte) {
- x86_page_table* l2pt = (x86_page_table*)(mnt | (l1_index << 12));
- x86_pte_t l2pte = l2pt->entry[l2_index];
-
- cpu_flush_page(va);
- l2pt->entry[l2_index] = PTE_NULL;
-
- return PG_ENTRY_ADDR(l2pte);
- }
-
- return 0;
-}
-
-int
-vmm_lookup(ptr_t va, v_mapping* mapping)
-{
- return vmm_lookupat(VMS_SELF, va, mapping);
-}
+ pte_t old = *ptep;
-int
-vmm_lookupat(ptr_t mnt, ptr_t va, v_mapping* mapping)
-{
- u32_t l1_index = L1_INDEX(va);
- u32_t l2_index = L2_INDEX(va);
-
- x86_page_table* l1pt = (x86_page_table*)(mnt | 1023 << 12);
- x86_pte_t l1pte = l1pt->entry[l1_index];
-
- if (l1pte) {
- x86_pte_t* l2pte =
- &((x86_page_table*)(mnt | (l1_index << 12)))->entry[l2_index];
-
- if (l2pte) {
- mapping->flags = PG_ENTRY_FLAGS(*l2pte);
- mapping->pa = PG_ENTRY_ADDR(*l2pte);
- mapping->pn = mapping->pa >> PG_SIZE_BITS;
- mapping->pte = l2pte;
- mapping->va = va;
- return 1;
- }
- }
+ set_pte(ptep, null_pte);
- return 0;
+ return pte_paddr(old);
}
-ptr_t
-vmm_v2p(ptr_t va)
+pte_t
+vmm_tryptep(pte_t* ptep, size_t lvl_size)
{
- u32_t l1_index = L1_INDEX(va);
- u32_t l2_index = L2_INDEX(va);
-
- x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
- x86_pte_t l1pte = l1pt->entry[l1_index];
-
- if (l1pte) {
- x86_pte_t* l2pte =
- &((x86_page_table*)L2_VADDR(l1_index))->entry[l2_index];
-
- if (l2pte) {
- return PG_ENTRY_ADDR(*l2pte) | ((ptr_t)va & 0xfff);
- }
- }
- return 0;
+ 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;
}
ptr_t
vmm_v2pat(ptr_t mnt, ptr_t va)
{
- u32_t l1_index = L1_INDEX(va);
- u32_t l2_index = L2_INDEX(va);
-
- x86_page_table* l1pt = (x86_page_table*)(mnt | 1023 << 12);
- x86_pte_t l1pte = l1pt->entry[l1_index];
-
- if (l1pte) {
- x86_pte_t* l2pte =
- &((x86_page_table*)(mnt | (l1_index << 12)))->entry[l2_index];
+ ptr_t va_off = va_offset(va);
+ pte_t* ptep = mkptep_va(mnt, va);
- if (l2pte) {
- return PG_ENTRY_ADDR(*l2pte) | ((ptr_t)va & 0xfff);
- }
- }
- return 0;
+ return pte_paddr(pte_at(ptep)) + va_off;
}
ptr_t
-vmm_mount_pd(ptr_t mnt, ptr_t pde)
+vms_mount(ptr_t mnt, ptr_t vms_root)
{
- assert(pde);
+ assert(vms_root);
- x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
- l1pt->entry[(mnt >> 22)] = NEW_L1_ENTRY(T_SELF_REF_PERM, pde);
+ pte_t* ptep = mkl0tep_va(VMS_SELF, mnt);
+ set_pte(ptep, mkpte(vms_root, KERNEL_DATA));
cpu_flush_page(mnt);
return mnt;
}
ptr_t
-vmm_unmount_pd(ptr_t mnt)
+vms_unmount(ptr_t mnt)
{
- x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
- l1pt->entry[(mnt >> 22)] = 0;
+ pte_t* ptep = mkl0tep_va(VMS_SELF, mnt);
+ set_pte(ptep, null_pte);
cpu_flush_page(mnt);
return mnt;
}
-ptr_t
-vmm_dup_page(ptr_t pa)
+
+void
+ptep_alloc_hierarchy(pte_t* ptep, ptr_t va, pte_attr_t prot)
{
- ptr_t new_ppg = pmm_alloc_page(0);
- vmm_set_mapping(VMS_SELF, PG_MOUNT_3, new_ppg, PG_PREM_RW, VMAP_NULL);
- vmm_set_mapping(VMS_SELF, PG_MOUNT_4, pa, PG_PREM_RW, VMAP_NULL);
+ pte_t* _ptep;
+
+ _ptep = mkl0tep(ptep);
+ if (_ptep == ptep) {
+ return;
+ }
- asm volatile("movl %1, %%edi\n"
- "movl %2, %%esi\n"
- "rep movsl\n" ::"c"(1024),
- "r"(PG_MOUNT_3),
- "r"(PG_MOUNT_4)
- : "memory", "%edi", "%esi");
+ _ptep = mkl1t(_ptep, va, prot);
+ if (_ptep == ptep) {
+ return;
+ }
- vmm_del_mapping(VMS_SELF, PG_MOUNT_3);
- vmm_del_mapping(VMS_SELF, PG_MOUNT_4);
+ _ptep = mkl2t(_ptep, va, prot);
+ if (_ptep == ptep) {
+ return;
+ }
+
+ _ptep = mkl3t(_ptep, va, prot);
+ if (_ptep == ptep) {
+ return;
+ }
- return new_ppg;
+ _ptep = mklft(_ptep, va, prot);
+ assert(_ptep == ptep);
}
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff