X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/0cf90cca0c924622f3fee8d2a3fafa8238363dc6..bffa3430fbbaaad29bec0b5bee9c1f0bfc7fd068:/lunaix-os/kernel/mm/vmm.c diff --git a/lunaix-os/kernel/mm/vmm.c b/lunaix-os/kernel/mm/vmm.c index 8f67bd2..24fa422 100644 --- a/lunaix-os/kernel/mm/vmm.c +++ b/lunaix-os/kernel/mm/vmm.c @@ -1,11 +1,12 @@ -#include #include -#include -#include +#include #include #include -LOG_MODULE("VMM") +#include +#include + +LOG_MODULE("VM") void vmm_init() @@ -13,184 +14,81 @@ vmm_init() // XXX: something here? } -x86_page_table* -vmm_init_pd() +pte_t +vmm_tryptep(pte_t* ptep, size_t lvl_size) { - 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; + 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; } -int -vmm_set_mapping(uintptr_t mnt, - uintptr_t va, - uintptr_t pa, - pt_attr attr, - int options) +ptr_t +vms_mount(ptr_t mnt, ptr_t vms_root) { - 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); - - // 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 | PG_PRESENT, new_l1pt_pa); - - // make sure our new l2 table is visible to CPU - cpu_invplg(l2pt); - - memset((void*)l2pt, 0, PG_SIZE); - } else { - x86_pte_t pte = l2pt->entry[l2_inx]; - if (pte && (options & VMAP_IGNORE)) { - return 1; - } - } + assert(vms_root); - if (mnt == VMS_SELF) { - cpu_invplg(va); - } - - if ((options & VMAP_NOMAP)) { - return 1; - } - - l2pt->entry[l2_inx] = NEW_L2_ENTRY(attr, pa); - return 1; + pte_t* ptep = mkl0tep_va(VMS_SELF, mnt); + set_pte(ptep, mkpte(vms_root, KERNEL_PGTAB)); + tlb_flush_kernel(mnt); + return mnt; } -uintptr_t -vmm_del_mapping(uintptr_t mnt, uintptr_t va) +ptr_t +vms_unmount(ptr_t mnt) { - 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; - } - - 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]; - - cpu_invplg(va); - l2pt->entry[l2_index] = PTE_NULL; - - return PG_ENTRY_ADDR(l2pte); - } - - return 0; + pte_t* ptep = mkl0tep_va(VMS_SELF, mnt); + set_pte(ptep, null_pte); + tlb_flush_kernel(mnt); + return mnt; } -int -vmm_lookup(uintptr_t va, v_mapping* mapping) -{ - return vmm_lookupat(VMS_SELF, va, mapping); -} -int -vmm_lookupat(ptr_t mnt, uintptr_t va, v_mapping* mapping) +void +ptep_alloc_hierarchy(pte_t* ptep, ptr_t va, pte_attr_t prot) { - 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; - } + pte_t* _ptep; + + _ptep = mkl0tep(ptep); + if (_ptep == ptep) { + return; } - return 0; -} - -void* -vmm_v2p(void* va) -{ - 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) | ((uintptr_t)va & 0xfff); - } + _ptep = mkl1t(_ptep, va, prot); + if (_ptep == ptep) { + return; } - return 0; -} - -void* -vmm_v2pat(ptr_t mnt, void* 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]; - if (l2pte) { - return PG_ENTRY_ADDR(*l2pte) | ((uintptr_t)va & 0xfff); - } + _ptep = mkl2t(_ptep, va, prot); + if (_ptep == ptep) { + return; } - return 0; -} -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; -} + _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; - cpu_invplg(mnt); + _ptep = mklft(_ptep, va, prot); + assert(_ptep == ptep); } \ No newline at end of file