-#include <libc/string.h>
-#include <lunaix/mm/page.h>
-#include <lunaix/mm/pmm.h>
-#include <lunaix/mm/vmm.h>
-#include <lunaix/assert.h>
#include <hal/cpu.h>
+#include <klibc/string.h>
+#include <lunaix/mm/vmm.h>
+#include <lunaix/spike.h>
+
+#include <stdbool.h>
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_map_internal(pid_t pid,
+ uint32_t l1_inx,
+ uint32_t l2_inx,
+ uintptr_t pa,
+ pt_attr attr,
+ int forced)
+{
+ 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[l1_inx]) {
- uint8_t* new_l1pt_pa = pmm_alloc_page();
+ 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;
}
- 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, 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[l2_inx] = NEW_L2_ENTRY(attr, pa);
+ l2pt->entry[l2_inx] = NEW_L2_ENTRY(attr, pa);
return 1;
}
void*
-vmm_map_page(void* va, void* pa, pt_attr tattr)
+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)
+ 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;
+ 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）
- ptd_t l1pte = l1pt[l1_index];
- pt_t* l2pt = (pt_t*)L2_VADDR(l1_index);
+ 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[l1_index];
- l2pt = (pt_t*)L2_VADDR(l1_index);
+ 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 (l2pt && !l2pt[l2_index]) {
- l2pt[l2_index] = NEW_L2_ENTRY(tattr, pa);
+ 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++;
return NULL;
}
- if (!__vmm_map_internal(l1_index, l2_index, pa, tattr)) {
+ if (!__vmm_map_internal(pid, l1_index, l2_index, (uintptr_t)pa, tattr, false)) {
return NULL;
}
}
void*
-vmm_fmap_page(void* va, void* pa, pt_attr tattr) {
+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)
+ 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(l1_index, l2_index, pa, tattr)) {
+ if (!__vmm_map_internal(pid, l1_index, l2_index, (uintptr_t)pa, tattr, true)) {
return NULL;
}
cpu_invplg(va);
- return (void*)V_ADDR(l1_index, l2_index, PG_OFFSET(va));
+ return va;
}
void*
-vmm_alloc_page(void* vpn, pt_attr tattr)
+vmm_alloc_page(pid_t pid, void* vpn, void** pa, pt_attr tattr, pp_attr_t pattr)
{
- void* pp = pmm_alloc_page();
- void* result = vmm_map_page(vpn, pp, tattr);
+ void* pp = pmm_alloc_page(pid, pattr);
+ void* result = vmm_map_page(pid, vpn, pp, tattr);
if (!result) {
- pmm_free_page(pp);
+ pmm_free_page(pp, pid);
}
+ pa ? (*pa = pp) : 0;
return result;
}
-void
-vmm_unmap_page(void* va)
+int
+vmm_alloc_pages(pid_t pid, void* va, size_t sz, pt_attr tattr, pp_attr_t pattr)
{
- assert(((uintptr_t)va & 0xFFFU) == 0)
+ 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);
uint32_t l2_index = L2_INDEX(va);
- ptd_t* l1pt = (ptd_t*)L1_BASE_VADDR;
- ptd_t l1pte = l1pt[l1_index];
+ // prevent unmap of recursive mapping region
+ if (l1_index == 1023) {
+ return;
+ }
+
+ 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_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);
}
- l2pt[l2_index] = 0;
+ cpu_invplg(va);
+ l2pt->entry[l2_index] = PTE_NULL;
}
}
+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)
+ assert(((uintptr_t)va & 0xFFFU) == 0);
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;
- ptd_t l1pte = l1pt[l1_index];
+ 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) {
- pt_t l2pte = ((pt_t*)L2_VADDR(l1_index))[l2_index];
+ x86_pte_t* l2pte =
+ &((x86_page_table*)L2_VADDR(l1_index))->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.flags = PG_ENTRY_FLAGS(*l2pte);
+ mapping.pa = PG_ENTRY_ADDR(*l2pte);
mapping.pn = mapping.pa >> PG_SIZE_BITS;
+ mapping.pte = l2pte;
}
}
}
void*
-vmm_v2p(void* va) {
- return vmm_lookup(va).pa;
+vmm_v2p(void* va)
+{
+ 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;
+}
+
+void*
+vmm_unmount_pd() {
+ x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
+ l1pt->entry[(PD_MOUNT >> 22)] = 0;
}
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff