-#include <libc/string.h>
-#include <lunaix/mm/page.h>
+#include <hal/cpu.h>
+#include <klibc/string.h>
#include <lunaix/mm/pmm.h>
#include <lunaix/mm/vmm.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);
-}
-
-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
-}
+#include <lunaix/spike.h>
void
vmm_init()
{
- // TODO: something here?
+ // XXX: something here?
}
-ptd_t*
+x86_page_table*
vmm_init_pd()
{
- ptd_t* dir = pmm_alloc_page();
- for (size_t i = 0; i < 1024; i++) {
- dir[i] = 0;
+ x86_page_table* dir =
+ (x86_page_table*)pmm_alloc_page(KERNEL_PID, PP_FGPERSIST);
+ for (size_t i = 0; i < PG_MAX_ENTRIES; i++) {
+ dir->entry[i] = PTE_NULL;
}
- // 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);
+ // 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);
return dir;
}
-void*
-vmm_map_page(void* va, void* pa, pt_attr dattr, pt_attr tattr)
+int
+vmm_set_mapping(uintptr_t mnt,
+ uintptr_t va,
+ uintptr_t pa,
+ pt_attr attr,
+ int options)
{
- // 显然，对空指针进行映射没有意义。
- if (!pa || !va) {
- return NULL;
- }
+ assert((uintptr_t)va % PG_SIZE == 0);
+
+ uintptr_t l1_inx = L1_INDEX(va);
+ uintptr_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);
+
+ if (!l1pt->entry[l1_inx]) {
+ x86_page_table* new_l1pt_pa = pmm_alloc_page(KERNEL_PID, PP_FGPERSIST);
- 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);
+ // 物理内存已满！
+ if (!new_l1pt_pa) {
+ return 0;
}
- // 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));
+
+ // This must be writable
+ l1pt->entry[l1_inx] = NEW_L1_ENTRY(attr | PG_WRITE, new_l1pt_pa);
+ memset((void*)l2pt, 0, PG_SIZE);
+ } else {
+ x86_pte_t pte = l2pt->entry[l2_inx];
+ if (pte && (options & VMAP_IGNORE)) {
+ return 1;
}
- pt_offset++;
}
- // 页目录与所有页表已满！
- if (pd_offset > 1024) {
- return NULL;
+ if (mnt == PD_REFERENCED) {
+ cpu_invplg(va);
+ }
+
+ if ((options & VMAP_NOMAP)) {
+ return 1;
}
- // 页目录有空位，需要开辟一个新的 PDE
- uint8_t* new_pt_pa = pmm_alloc_page();
+ l2pt->entry[l2_inx] = NEW_L2_ENTRY(attr, pa);
+ return 1;
+}
+
+uintptr_t
+vmm_del_mapping(uintptr_t mnt, uintptr_t va)
+{
+ assert(((uintptr_t)va & 0xFFFU) == 0);
+
+ uint32_t l1_index = L1_INDEX(va);
+ uint32_t l2_index = L2_INDEX(va);
- // 物理内存已满！
- if (!new_pt_pa) {
- return NULL;
+ // prevent unmap of recursive mapping region
+ if (l1_index == 1023) {
+ return 0;
}
- ptd[pd_offset] = PDE(dattr, new_pt_pa);
+ x86_page_table* l1pt = (x86_page_table*)(mnt | (1023 << 12));
- memset((void*)PT_VADDR(pd_offset), 0, PM_PAGE_SIZE);
- pt[pt_offset] = PTE(tattr, pa);
+ x86_pte_t l1pte = l1pt->entry[l1_index];
- return (void*)V_ADDR(pd_offset, pt_offset, PG_OFFSET(va));
-}
+ if (l1pte) {
+ x86_page_table* l2pt = (x86_page_table*)(mnt | (l1_index << 12));
+ x86_pte_t l2pte = l2pt->entry[l2_index];
-void*
-vmm_alloc_page(void* vpn, pt_attr dattr, pt_attr tattr)
-{
- void* pp = pmm_alloc_page();
- void* result = vmm_map_page(vpn, pp, dattr, tattr);
- if (!result) {
- pmm_free_page(pp);
+ cpu_invplg(va);
+ l2pt->entry[l2_index] = PTE_NULL;
+
+ return PG_ENTRY_ADDR(l2pte);
}
- return result;
+
+ return 0;
}
-void
-vmm_unmap_page(void* vpn)
+int
+vmm_lookup(uintptr_t va, v_mapping* mapping)
{
- 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];
-
- 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
+ uint32_t l1_index = L1_INDEX(va);
+ uint32_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) {
+ 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;
}
- pt[pt_offset] = 0;
}
+ return 0;
}
void*
-vmm_v2p(void* va)
+vmm_mount_pd(uintptr_t mnt, void* pde)
{
- 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;
-
- 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);
- }
- }
+ x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
+ l1pt->entry[(mnt >> 22)] = NEW_L1_ENTRY(T_SELF_REF_PERM, pde);
+ cpu_invplg(mnt);
+ return mnt;
+}
- return NULL;
+void*
+vmm_unmount_pd(uintptr_t mnt)
+{
+ x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
+ l1pt->entry[(mnt >> 22)] = 0;
+ cpu_invplg(mnt);
}
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff