X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/965940833071025bf0d386f4a9c70a5258453dbd..69777bdcab284335651a8002e2896f3862fa423d:/lunaix-os/kernel/mm/vmm.c diff --git a/lunaix-os/kernel/mm/vmm.c b/lunaix-os/kernel/mm/vmm.c index 5e09e9d..6b497b8 100644 --- a/lunaix-os/kernel/mm/vmm.c +++ b/lunaix-os/kernel/mm/vmm.c @@ -7,7 +7,7 @@ #include #include -LOG_MODULE("VMM") +LOG_MODULE("VM") void vmm_init() @@ -15,217 +15,138 @@ vmm_init() // XXX: something here? } -x86_page_table* -vmm_init_pd() +pte_t +vmm_alloc_page(pte_t* ptep, pte_t pte) { - x86_page_table* dir = - (x86_page_table*)pmm_alloc_page(PP_FGPERSIST); - for (size_t i = 0; i < PG_MAX_ENTRIES; i++) { - dir->entry[i] = PTE_NULL; + ptr_t pa = pmm_alloc_page(PP_FGPERSIST); + if (!pa) { + return null_pte; } - // 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); + pte = pte_setpaddr(pte, pa); + pte = pte_mkloaded(pte); + set_pte(ptep, pte); - return dir; + mount_page(PG_MOUNT_1, pa); + memset((void*)PG_MOUNT_1, 0, LFT_SIZE); + unmount_page(PG_MOUNT_1); + + cpu_flush_page((ptr_t)ptep); + + return pte; } int -vmm_set_mapping(ptr_t mnt, ptr_t va, ptr_t pa, pt_attr attr, int options) +vmm_set_mapping(ptr_t mnt, ptr_t va, ptr_t pa, pte_attr_t prot) { - assert((ptr_t)va % PG_SIZE == 0); - - ptr_t l1_inx = L1_INDEX(va); - ptr_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); - - x86_pte_t* l1pte = &l1pt->entry[l1_inx]; - if (!*l1pte) { - x86_page_table* new_l1pt_pa = - (x86_page_table*)pmm_alloc_page(PP_FGPERSIST); - - // 物理内存已满！ - if (!new_l1pt_pa) { - return 0; - } - - // This must be writable - *l1pte = NEW_L1_ENTRY(attr | PG_WRITE | PG_PRESENT, new_l1pt_pa); - - // make sure our new l2 table is visible to CPU - cpu_flush_page((ptr_t)l2pt); - - memset((void*)l2pt, 0, PG_SIZE); - } else { - if ((attr & PG_ALLOW_USER) && !(*l1pte & PG_ALLOW_USER)) { - *l1pte |= PG_ALLOW_USER; - } - - x86_pte_t pte = l2pt->entry[l2_inx]; - if (pte && (options & VMAP_IGNORE)) { - return 1; - } - } + assert(!va_offset(va)); - if (mnt == VMS_SELF) { - cpu_flush_page(va); - } + pte_t* ptep = mkptep_va(mnt, va); + pte_t pte = mkpte(pa, prot); - if ((options & VMAP_NOMAP)) { - return 1; - } + set_pte(ptep, pte); - if (!(options & VMAP_GUARDPAGE)) { - l2pt->entry[l2_inx] = NEW_L2_ENTRY(attr, pa); - } else { - l2pt->entry[l2_inx] = MEMGUARD; - } - return 1; } ptr_t vmm_del_mapping(ptr_t mnt, ptr_t va) { - assert(((ptr_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(!va_offset(va)); - x86_page_table* l1pt = (x86_page_table*)(mnt | (1023 << 12)); + pte_t* ptep = mkptep_va(mnt, va); - 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_flush_page(va); - l2pt->entry[l2_index] = PTE_NULL; - - return PG_ENTRY_ADDR(l2pte); - } - - return 0; -} - -int -vmm_lookup(ptr_t va, v_mapping* mapping) -{ - return vmm_lookupat(VMS_SELF, va, mapping); -} + pte_t old = *ptep; -int -vmm_lookupat(ptr_t mnt, ptr_t va, v_mapping* mapping) -{ - 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; - } - } + set_pte(ptep, null_pte); - return 0; + return pte_paddr(old); } -ptr_t -vmm_v2p(ptr_t va) +pte_t +vmm_tryptep(pte_t* ptep, size_t lvl_size) { - 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) | ((ptr_t)va & 0xfff); - } - } - return 0; + 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; } ptr_t vmm_v2pat(ptr_t mnt, ptr_t 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]; + ptr_t va_off = va_offset(va); + pte_t* ptep = mkptep_va(mnt, va); - if (l2pte) { - return PG_ENTRY_ADDR(*l2pte) | ((ptr_t)va & 0xfff); - } - } - return 0; + return pte_paddr(pte_at(ptep)) + va_off; } ptr_t -vmm_mount_pd(ptr_t mnt, ptr_t pde) +vms_mount(ptr_t mnt, ptr_t vms_root) { - assert(pde); + assert(vms_root); - x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR; - l1pt->entry[(mnt >> 22)] = NEW_L1_ENTRY(T_SELF_REF_PERM, pde); + pte_t* ptep = mkl0tep_va(VMS_SELF, mnt); + set_pte(ptep, mkpte(vms_root, KERNEL_DATA)); cpu_flush_page(mnt); return mnt; } ptr_t -vmm_unmount_pd(ptr_t mnt) +vms_unmount(ptr_t mnt) { - x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR; - l1pt->entry[(mnt >> 22)] = 0; + pte_t* ptep = mkl0tep_va(VMS_SELF, mnt); + set_pte(ptep, null_pte); cpu_flush_page(mnt); return mnt; } -ptr_t -vmm_dup_page(ptr_t pa) + +void +ptep_alloc_hierarchy(pte_t* ptep, ptr_t va, pte_attr_t prot) { - ptr_t new_ppg = pmm_alloc_page(0); - vmm_set_mapping(VMS_SELF, PG_MOUNT_3, new_ppg, PG_PREM_RW, VMAP_NULL); - vmm_set_mapping(VMS_SELF, PG_MOUNT_4, pa, PG_PREM_RW, VMAP_NULL); + pte_t* _ptep; + + _ptep = mkl0tep(ptep); + if (_ptep == ptep) { + return; + } - asm volatile("movl %1, %%edi\n" - "movl %2, %%esi\n" - "rep movsl\n" ::"c"(1024), - "r"(PG_MOUNT_3), - "r"(PG_MOUNT_4) - : "memory", "%edi", "%esi"); + _ptep = mkl1t(_ptep, va, prot); + if (_ptep == ptep) { + return; + } - vmm_del_mapping(VMS_SELF, PG_MOUNT_3); - vmm_del_mapping(VMS_SELF, PG_MOUNT_4); + _ptep = mkl2t(_ptep, va, prot); + if (_ptep == ptep) { + return; + } + + _ptep = mkl3t(_ptep, va, prot); + if (_ptep == ptep) { + return; + } - return new_ppg; + _ptep = mklft(_ptep, va, prot); + assert(_ptep == ptep); } \ No newline at end of file