-#include <hal/cpu.h>
#include <klibc/string.h>
-#include <lunaix/mm/vmm.h>
+#include <lunaix/mm/page.h>
#include <lunaix/spike.h>
+#include <lunaix/syslog.h>
-#include <stdbool.h>
+#include <sys/cpu.h>
+#include <sys/mm/mm_defs.h>
+
+LOG_MODULE("VM")
void
vmm_init()
// XXX: something here?
}
-x86_page_table*
-vmm_init_pd()
-{
- 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;
- }
-
- // 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;
-}
-
-int
-__vmm_map_internal(pid_t pid,
- uint32_t l1_inx,
- uint32_t l2_inx,
- uintptr_t pa,
- pt_attr attr,
- int forced)
+pte_t
+vmm_tryptep(pte_t* ptep, size_t lvl_size)
{
- x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
- x86_page_table* l2pt = (x86_page_table*)L2_VADDR(l1_inx);
-
- // See if attr make sense
- assert(attr <= 128);
-
- if (!l1pt->entry[l1_inx]) {
- x86_page_table* new_l1pt_pa = pmm_alloc_page(pid, PP_FGPERSIST);
-
- // 物理内存已满！
- if (!new_l1pt_pa) {
- return 0;
- }
-
- // This must be writable
- l1pt->entry[l1_inx] = NEW_L1_ENTRY(attr | PG_WRITE, new_l1pt_pa);
- memset((void*)L2_VADDR(l1_inx), 0, PG_SIZE);
- }
-
- x86_pte_t l2pte = l2pt->entry[l2_inx];
- if (l2pte) {
- if (!forced) {
- return 0;
- }
- }
-
- if ((HAS_FLAGS(attr, PG_PRESENT))) {
- // add one on reference count, regardless of existence.
- pmm_ref_page(pid, pa);
- }
-
- l2pt->entry[l2_inx] = NEW_L2_ENTRY(attr, pa);
-
- return 1;
+ 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_map_page(pid_t pid, void* va, void* pa, 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;
- }
-
- assert(((uintptr_t)va & 0xFFFU) == 0) assert(((uintptr_t)pa & 0xFFFU) == 0);
+ assert(vms_root);
- uint32_t l1_index = L1_INDEX(va);
- uint32_t l2_index = L2_INDEX(va);
- x86_page_table* l1pt = (x86_page_table*)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）
- x86_pte_t l1pte = l1pt->entry[l1_index];
- x86_page_table* l2pt = (x86_page_table*)L2_VADDR(l1_index);
- while (l1pte && l1_index < PG_MAX_ENTRIES) {
- if (l2_index == PG_MAX_ENTRIES) {
- l1_index++;
- l2_index = 0;
- l1pte = l1pt->entry[l1_index];
- l2pt = (x86_page_table*)L2_VADDR(l1_index);
- }
- // 页表有空位，只需要开辟一个新的 PTE (Level 2)
- if (__vmm_map_internal(pid, l1_index, l2_index, pa, tattr, false)) {
- 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(pid, l1_index, l2_index, (uintptr_t)pa, tattr, false)) {
- return NULL;
- }
-
- 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_DATA));
+ tlb_flush_kernel(mnt);
+ return mnt;
}
-void*
-vmm_fmap_page(pid_t pid, void* va, void* pa, pt_attr tattr)
+ptr_t
+vms_unmount(ptr_t mnt)
{
- 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(pid, l1_index, l2_index, (uintptr_t)pa, tattr, true)) {
- return NULL;
- }
-
- cpu_invplg(va);
-
- return va;
+ pte_t* ptep = mkl0tep_va(VMS_SELF, mnt);
+ set_pte(ptep, null_pte);
+ tlb_flush_kernel(mnt);
+ return mnt;
}
-void*
-vmm_alloc_page(pid_t pid, void* vpn, void** pa, pt_attr tattr, pp_attr_t pattr)
-{
- void* pp = pmm_alloc_page(pid, pattr);
- void* result = vmm_map_page(pid, vpn, pp, tattr);
- if (!result) {
- pmm_free_page(pp, pid);
- }
- pa ? (*pa = pp) : 0;
- return result;
-}
-int
-vmm_alloc_pages(pid_t pid, void* va, size_t sz, pt_attr tattr, pp_attr_t pattr)
+void
+ptep_alloc_hierarchy(pte_t* ptep, ptr_t va, pte_attr_t prot)
{
- assert((uintptr_t)va % PG_SIZE == 0) assert(sz % PG_SIZE == 0);
-
- void* va_ = va;
- for (size_t i = 0; i < (sz >> PG_SIZE_BITS); i++, va_ += PG_SIZE) {
- void* pp = pmm_alloc_page(pid, pattr);
- uint32_t l1_index = L1_INDEX(va_);
- uint32_t l2_index = L2_INDEX(va_);
- if (!pp || !__vmm_map_internal(
- pid,
- l1_index, l2_index, (uintptr_t)pp, tattr, false)) {
- // if one failed, release previous allocated pages.
- va_ = va;
- for (size_t j = 0; j < i; j++, va_ += PG_SIZE) {
- vmm_unmap_page(pid, va_);
- }
-
- return false;
- }
- }
-
- return true;
-}
-
-int
-vmm_set_mapping(pid_t pid, void* va, void* pa, pt_attr attr) {
- assert(((uintptr_t)va & 0xFFFU) == 0);
-
- uint32_t l1_index = L1_INDEX(va);
- uint32_t l2_index = L2_INDEX(va);
-
- // prevent map of recursive mapping region
- if (l1_index == 1023) {
- return 0;
- }
+ pte_t* _ptep;
- __vmm_map_internal(pid, l1_index, l2_index, (uintptr_t)pa, attr, false);
- return 1;
-}
-
-void
-__vmm_unmap_internal(pid_t pid, void* va, int free_ppage) {
- assert(((uintptr_t)va & 0xFFFU) == 0);
-
- uint32_t l1_index = L1_INDEX(va);
- uint32_t l2_index = L2_INDEX(va);
-
- // prevent unmap of recursive mapping region
- if (l1_index == 1023) {
+ _ptep = mkl0tep(ptep);
+ if (_ptep == ptep) {
return;
}
- x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
-
- x86_pte_t l1pte = l1pt->entry[l1_index];
-
- if (l1pte) {
- x86_page_table* l2pt = (x86_page_table*)L2_VADDR(l1_index);
- x86_pte_t l2pte = l2pt->entry[l2_index];
- if (IS_CACHED(l2pte) && free_ppage) {
- pmm_free_page(pid, (void*)l2pte);
- }
- cpu_invplg(va);
- l2pt->entry[l2_index] = PTE_NULL;
+ _ptep = mkl1t(_ptep, va, prot);
+ if (_ptep == ptep) {
+ return;
}
-}
-void
-vmm_unset_mapping(void* va) {
- __vmm_unmap_internal(0, va, false);
-}
-
-void
-vmm_unmap_page(pid_t pid, void* va)
-{
- __vmm_unmap_internal(pid, va, true);
-}
-
-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);
-
- x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
- x86_pte_t l1pte = l1pt->entry[l1_index];
-
- v_mapping mapping = { .flags = 0, .pa = 0, .pn = 0 };
- 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;
- }
+ _ptep = mkl2t(_ptep, va, prot);
+ if (_ptep == ptep) {
+ return;
}
- return mapping;
-}
-
-void*
-vmm_v2p(void* va)
-{
- return (void*)vmm_lookup(va).pa;
-}
-
-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(PG_PREM_RW, pde);
- return mnt;
-}
+ _ptep = mkl3t(_ptep, va, prot);
+ if (_ptep == ptep) {
+ return;
+ }
-void*
-vmm_unmount_pd(uintptr_t mnt) {
- x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
- l1pt->entry[(mnt >> 22)] = 0;
+ _ptep = mklft(_ptep, va, prot);
+ assert(_ptep == ptep);
}
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff