#include <hal/cpu.h>
#include <klibc/string.h>
+#include <lunaix/mm/pmm.h>
#include <lunaix/mm/vmm.h>
#include <lunaix/spike.h>
-#include <stdbool.h>
-
void
vmm_init()
{
x86_page_table*
vmm_init_pd()
{
- x86_page_table* dir = (x86_page_table*)pmm_alloc_page(KERNEL_PID, PP_FGPERSIST);
+ 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;
}
}
int
-__vmm_map_internal(pid_t pid,
- uint32_t l1_inx,
- uint32_t l2_inx,
- uintptr_t pa,
- pt_attr attr,
- int forced)
+vmm_set_mapping(uintptr_t mnt,
+ uintptr_t va,
+ uintptr_t pa,
+ pt_attr attr,
+ int options)
{
- x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
- x86_page_table* l2pt = (x86_page_table*)L2_VADDR(l1_inx);
+ 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(pid, PP_FGPERSIST);
+ x86_page_table* new_l1pt_pa = pmm_alloc_page(KERNEL_PID, PP_FGPERSIST);
// 物理内存已满！
if (!new_l1pt_pa) {
}
// 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);
+ l1pt->entry[l1_inx] =
+ NEW_L1_ENTRY(attr | PG_WRITE | PG_PRESENT, 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;
+ }
}
- x86_pte_t l2pte = l2pt->entry[l2_inx];
- if (l2pte) {
- if (!forced) {
- return 0;
- }
+ if (mnt == PD_REFERENCED) {
+ cpu_invplg(va);
}
- if ((HAS_FLAGS(attr, PG_PRESENT))) {
- // add one on reference count, regardless of existence.
- pmm_ref_page(pid, pa);
+ if ((options & VMAP_NOMAP)) {
+ return 1;
}
l2pt->entry[l2_inx] = NEW_L2_ENTRY(attr, pa);
-
return 1;
}
-void*
-vmm_map_page(pid_t pid, 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);
- 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));
-}
-
-void*
-vmm_fmap_page(pid_t pid, void* va, void* pa, pt_attr tattr)
-{
- 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;
-}
-
-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)
+uintptr_t
+vmm_del_mapping(uintptr_t mnt, uintptr_t va)
{
- 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;
- }
-
- __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);
// prevent unmap of recursive mapping region
if (l1_index == 1023) {
- return;
+ return 0;
}
- x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
+ 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*)L2_VADDR(l1_index);
+ x86_page_table* l2pt = (x86_page_table*)(mnt | (l1_index << 12));
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;
+
+ return PG_ENTRY_ADDR(l2pte);
}
-}
-void
-vmm_unset_mapping(void* va) {
- __vmm_unmap_internal(0, va, false);
+ return 0;
}
-void
-vmm_unmap_page(pid_t pid, void* va)
-{
- __vmm_unmap_internal(pid, va, true);
-}
-
-v_mapping
-vmm_lookup(void* va)
+int
+vmm_lookup(uintptr_t va, v_mapping* mapping)
{
- 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;
+ 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 mapping;
+ return 0;
}
void*
-vmm_v2p(void* va)
+vmm_mount_pd(uintptr_t mnt, void* pde)
{
- return (void*)vmm_lookup(va).pa;
-}
-
-void*
-vmm_mount_pd(void* pde) {
x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
- l1pt->entry[(PD_MOUNT >> 22)] = NEW_L1_ENTRY(PG_PREM_RW, pde);
- return PD_MOUNT;
+ l1pt->entry[(mnt >> 22)] = NEW_L1_ENTRY(T_SELF_REF_PERM, pde);
+ cpu_invplg(mnt);
+ return mnt;
}
void*
-vmm_unmount_pd() {
+vmm_unmount_pd(uintptr_t mnt)
+{
x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
- l1pt->entry[(PD_MOUNT >> 22)] = 0;
+ l1pt->entry[(mnt >> 22)] = 0;
+ cpu_invplg(mnt);
}
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff