-#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>
-#include <lunaix/assert.h>
-#include <hal/cpu.h>
+#include <lunaix/spike.h>
+#include <lunaix/syslog.h>
+
+LOG_MODULE("VMM")
void
vmm_init()
{
- // TODO: something here?
+ // XXX: something here?
}
-ptd_t*
+x86_page_table*
vmm_init_pd()
{
- ptd_t* dir = pmm_alloc_page();
+ 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[i] = 0;
+ dir->entry[i] = PTE_NULL;
}
// 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);
+ dir->entry[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);
+vmm_set_mapping(uintptr_t mnt,
+ uintptr_t va,
+ uintptr_t pa,
+ pt_attr attr,
+ int options)
+{
+ 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[l1_inx]) {
- uint8_t* new_l1pt_pa = pmm_alloc_page();
+ if (!l1pt->entry[l1_inx]) {
+ x86_page_table* new_l1pt_pa = pmm_alloc_page(KERNEL_PID, PP_FGPERSIST);
// 物理内存已满！
if (!new_l1pt_pa) {
return 0;
}
- l1pt[l1_inx] = NEW_L1_ENTRY(attr, new_l1pt_pa);
- memset((void*)L2_VADDR(l1_inx), 0, PM_PAGE_SIZE);
- }
+ // This must be writable
+ l1pt->entry[l1_inx] =
+ NEW_L1_ENTRY(attr | PG_WRITE | PG_PRESENT, new_l1pt_pa);
- l2pt[l2_inx] = NEW_L2_ENTRY(attr, pa);
+ // make sure our new l2 table is visible to CPU
+ cpu_invplg(l2pt);
- return 1;
-}
-
-void*
-vmm_map_page(void* va, void* pa, pt_attr tattr)
-{
- // 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));
+ memset((void*)l2pt, 0, PG_SIZE);
+ } else {
+ x86_pte_t pte = l2pt->entry[l2_inx];
+ if (pte && (options & VMAP_IGNORE)) {
+ return 1;
}
- l2_index++;
}
- // 页目录与所有页表已满！
- if (l1_index > PG_MAX_ENTRIES) {
- return NULL;
+ if (mnt == VMS_SELF) {
+ cpu_invplg(va);
}
- if (!__vmm_map_internal(l1_index, l2_index, pa, tattr)) {
- return NULL;
+ if ((options & VMAP_NOMAP)) {
+ return 1;
}
- return (void*)V_ADDR(l1_index, l2_index, PG_OFFSET(va));
+ l2pt->entry[l2_inx] = NEW_L2_ENTRY(attr, pa);
+ return 1;
}
-void*
-vmm_fmap_page(void* va, void* pa, pt_attr tattr) {
- if (!pa || !va) {
- return NULL;
+uintptr_t
+vmm_del_mapping(uintptr_t mnt, uintptr_t va)
+{
+ assert(((uintptr_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(((uintptr_t)va & 0xFFFU) == 0)
- assert(((uintptr_t)pa & 0xFFFU) == 0)
+ x86_page_table* l1pt = (x86_page_table*)(mnt | (1023 << 12));
+
+ 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];
- uint32_t l1_index = L1_INDEX(va);
- uint32_t l2_index = L2_INDEX(va);
+ cpu_invplg(va);
+ l2pt->entry[l2_index] = PTE_NULL;
- if (!__vmm_map_internal(l1_index, l2_index, pa, tattr)) {
- return NULL;
+ return PG_ENTRY_ADDR(l2pte);
}
- cpu_invplg(va);
+ return 0;
+}
- return (void*)V_ADDR(l1_index, l2_index, PG_OFFSET(va));
+int
+vmm_lookup(uintptr_t va, v_mapping* mapping)
+{
+ return vmm_lookupat(VMS_SELF, va, mapping);
}
-void*
-vmm_alloc_page(void* vpn, pt_attr tattr)
+int
+vmm_lookupat(ptr_t mnt, uintptr_t va, v_mapping* mapping)
{
- void* pp = pmm_alloc_page();
- void* result = vmm_map_page(vpn, pp, tattr);
- if (!result) {
- pmm_free_page(pp);
+ 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;
+ }
}
- return result;
+ return 0;
}
-void
-vmm_unmap_page(void* va)
+void*
+vmm_v2p(void* va)
{
- 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;
+ u32_t l1_index = L1_INDEX(va);
+ u32_t l2_index = L2_INDEX(va);
- ptd_t l1pte = l1pt[l1_index];
+ x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
+ x86_pte_t l1pte = l1pt->entry[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);
+ x86_pte_t* l2pte =
+ &((x86_page_table*)L2_VADDR(l1_index))->entry[l2_index];
+ if (l2pte) {
+ return PG_ENTRY_ADDR(*l2pte) | ((uintptr_t)va & 0xfff);
}
- l2pt[l2_index] = 0;
}
+ return 0;
}
-v_mapping
-vmm_lookup(void* va)
+void*
+vmm_v2pat(ptr_t mnt, void* va)
{
- assert(((uintptr_t)va & 0xFFFU) == 0)
+ u32_t l1_index = L1_INDEX(va);
+ u32_t l2_index = L2_INDEX(va);
- 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;
+ x86_page_table* l1pt = (x86_page_table*)(mnt | 1023 << 12);
+ x86_pte_t l1pte = l1pt->entry[l1_index];
- ptd_t l1pte = l1pt[l1_index];
-
- v_mapping mapping = { .flags = 0, .pa = 0, .pn = 0 };
if (l1pte) {
- pt_t l2pte = ((pt_t*)L2_VADDR(l1_index))[l2_index];
+ x86_pte_t* l2pte =
+ &((x86_page_table*)(mnt | (l1_index << 12)))->entry[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;
+ return PG_ENTRY_ADDR(*l2pte) | ((uintptr_t)va & 0xfff);
}
}
+ return 0;
+}
- return mapping;
+void*
+vmm_mount_pd(uintptr_t mnt, void* pde)
+{
+ 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;
}
void*
-vmm_v2p(void* va) {
- return vmm_lookup(va).pa;
+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