-#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/spike.h>
+#include <lunaix/syslog.h>
-// TODO: Move these nasty inline asm stuff into hal
-// These should be arch dependent
-ptd_t*
-get_pd()
-{
- ptd_t* pd;
-#ifdef __ARCH_IA32
- __asm__("movl %%cr3, %0\n"
- "andl $0xfffff000, %0"
- : "=r"(pd));
-#endif
- return (ptd_t*)P2V(pd);
-}
+#include <sys/cpu.h>
+#include <sys/mm/mm_defs.h>
-void
-set_pd(ptd_t* pd)
-{
-#ifdef __ARCH_IA32
- __asm__("movl %0, %%eax\n"
- "andl $0xfffff000, %%eax\n"
- "movl %%eax, %%cr3\n"
- :
- : "r"(pd));
-#endif
-}
+LOG_MODULE("VM")
void
vmm_init()
{
- // TODO: something here?
+ // XXX: something here?
}
-ptd_t*
-vmm_init_pd()
+pte_t
+vmm_tryptep(pte_t* ptep, size_t lvl_size)
{
- ptd_t* dir = pmm_alloc_page();
- for (size_t i = 0; i < 1024; i++) {
- dir[i] = 0;
- }
+ ptr_t va = ptep_va(ptep, lvl_size);
+ pte_t* _ptep = mkl0tep(ptep);
+ pte_t pte;
- // 自己映射自己，方便我们在软件层面进行查表地址转换
- dir[1023] = PDE(T_SELF_REF_PERM, dir);
+ if (pte_isnull(pte = *_ptep) || _ptep == ptep)
+ return pte;
- return dir;
+#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_map_page(void* va, void* pa, pt_attr dattr, pt_attr tattr)
+ptr_t
+vms_mount(ptr_t mnt, ptr_t vms_root)
{
- // 显然，对空指针进行映射没有意义。
- if (!pa || !va) {
- return NULL;
- }
-
- uintptr_t pd_offset = PD_INDEX(va);
- uintptr_t pt_offset = PT_INDEX(va);
- ptd_t* ptd = (ptd_t*)PTD_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 pde = ptd[pd_offset];
- pt_t* pt = (pt_t*)PT_VADDR(pd_offset);
- while (pde && pd_offset < 1024) {
- if (pt_offset == 1024) {
- pd_offset++;
- pt_offset = 0;
- pde = ptd[pd_offset];
- pt = (pt_t*)PT_VADDR(pd_offset);
- }
- // 页表有空位，只需要开辟一个新的 PTE
- if (pt && !pt[pt_offset]) {
- pt[pt_offset] = PTE(tattr, pa);
- return (void*)V_ADDR(pd_offset, pt_offset, PG_OFFSET(va));
- }
- pt_offset++;
- }
+ assert(vms_root);
- // 页目录与所有页表已满！
- if (pd_offset > 1024) {
- return NULL;
- }
-
- // 页目录有空位，需要开辟一个新的 PDE
- uint8_t* new_pt_pa = pmm_alloc_page();
-
- // 物理内存已满！
- if (!new_pt_pa) {
- return NULL;
- }
-
- ptd[pd_offset] = PDE(dattr, new_pt_pa);
-
- memset((void*)PT_VADDR(pd_offset), 0, PM_PAGE_SIZE);
- pt[pt_offset] = PTE(tattr, pa);
-
- return (void*)V_ADDR(pd_offset, pt_offset, 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 dattr, pt_attr tattr)
+ptr_t
+vms_unmount(ptr_t mnt)
{
- void* pp = pmm_alloc_page();
- void* result = vmm_map_page(vpn, pp, dattr, 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* vpn)
+ptep_alloc_hierarchy(pte_t* ptep, ptr_t va, pte_attr_t prot)
{
- uintptr_t pd_offset = PD_INDEX(vpn);
- uintptr_t pt_offset = PT_INDEX(vpn);
- ptd_t* self_pde = (ptd_t*)PTD_BASE_VADDR;
-
- ptd_t pde = self_pde[pd_offset];
+ pte_t* _ptep;
+
+ _ptep = mkl0tep(ptep);
+ if (_ptep == ptep) {
+ return;
+ }
- if (pde) {
- pt_t* pt = (pt_t*)PT_VADDR(pd_offset);
- uint32_t pte = pt[pt_offset];
- if (IS_CACHED(pte) && pmm_free_page((void*)pte)) {
-// 刷新TLB
-#ifdef __ARCH_IA32
- __asm__("invlpg (%0)" ::"r"((uintptr_t)vpn) : "memory");
-#endif
- }
- pt[pt_offset] = 0;
+ _ptep = mkl1t(_ptep, va, prot);
+ if (_ptep == ptep) {
+ return;
}
-}
-void*
-vmm_v2p(void* va)
-{
- uintptr_t pd_offset = PD_INDEX(va);
- uintptr_t pt_offset = PT_INDEX(va);
- uintptr_t po = PG_OFFSET(va);
- ptd_t* self_pde = (ptd_t*)PTD_BASE_VADDR;
+ _ptep = mkl2t(_ptep, va, prot);
+ if (_ptep == ptep) {
+ return;
+ }
- ptd_t pde = self_pde[pd_offset];
- if (pde) {
- pt_t pte = ((pt_t*)PT_VADDR(pd_offset))[pt_offset];
- if (pte) {
- uintptr_t ppn = pte >> 12;
- return (void*)P_ADDR(ppn, po);
- }
+ _ptep = mkl3t(_ptep, va, prot);
+ if (_ptep == ptep) {
+ return;
}
- return NULL;
+ _ptep = mklft(_ptep, va, prot);
+ assert(_ptep == ptep);
}
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff