refactor: use a more decent physical memory map

[lunaix-os.git] / lunaix-os / kernel / mm / vmm.c

diff --git a/lunaix-os/kernel/mm/vmm.c b/lunaix-os/kernel/mm/vmm.c
index 6e134fd0e2ec4da15a1590fe0ccb971cde1a3d8e..4cfb1a68bc40d1a912f951b3ef2256dcff4dd4e9 100644 (file)
--- a/lunaix-os/kernel/mm/vmm.c
+++ b/lunaix-os/kernel/mm/vmm.c
@@ -1,8 +1,11 @@
-#include <hal/cpu.h>
 #include <klibc/string.h>
 #include <lunaix/mm/pmm.h>
 #include <lunaix/mm/vmm.h>
 #include <lunaix/spike.h>
+#include <lunaix/syslog.h>
+#include <sys/cpu.h>
+
+LOG_MODULE("VMM")
 
 void
 vmm_init()
@@ -26,24 +29,22 @@ vmm_init_pd()
 }
 
 int
-vmm_set_mapping(uintptr_t mnt,
-                uintptr_t va,
-                uintptr_t pa,
-                pt_attr attr,
-                int options)
+vmm_set_mapping(ptr_t mnt, ptr_t va, ptr_t pa, pt_attr attr, int options)
 {
-    assert((uintptr_t)va % PG_SIZE == 0);
+    assert((ptr_t)va % PG_SIZE == 0);
 
-    uintptr_t l1_inx = L1_INDEX(va);
-    uintptr_t l2_inx = L2_INDEX(va);
+    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);
 
-    if (!l1pt->entry[l1_inx]) {
-        x86_page_table* new_l1pt_pa = pmm_alloc_page(KERNEL_PID, PP_FGPERSIST);
+    x86_pte_t* l1pte = &l1pt->entry[l1_inx];
+    if (!*l1pte) {
+        x86_page_table* new_l1pt_pa =
+          (x86_page_table*)pmm_alloc_page(KERNEL_PID, PP_FGPERSIST);
 
         // 物理内存已满！
         if (!new_l1pt_pa) {
@@ -51,19 +52,25 @@ vmm_set_mapping(uintptr_t mnt,
         }
 
         // This must be writable
-        l1pt->entry[l1_inx] =
-          NEW_L1_ENTRY(attr | PG_WRITE | PG_PRESENT, new_l1pt_pa);
+        *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;
         }
     }
 
-    if (mnt == PD_REFERENCED) {
-        cpu_invplg(va);
+    if (mnt == VMS_SELF) {
+        cpu_flush_page(va);
     }
 
     if ((options & VMAP_NOMAP)) {
@@ -74,13 +81,13 @@ vmm_set_mapping(uintptr_t mnt,
     return 1;
 }
 
-uintptr_t
-vmm_del_mapping(uintptr_t mnt, uintptr_t va)
+ptr_t
+vmm_del_mapping(ptr_t mnt, ptr_t va)
 {
-    assert(((uintptr_t)va & 0xFFFU) == 0);
+    assert(((ptr_t)va & 0xFFFU) == 0);
 
-    uint32_t l1_index = L1_INDEX(va);
-    uint32_t l2_index = L2_INDEX(va);
+    u32_t l1_index = L1_INDEX(va);
+    u32_t l2_index = L2_INDEX(va);
 
     // prevent unmap of recursive mapping region
     if (l1_index == 1023) {
@@ -95,7 +102,7 @@ vmm_del_mapping(uintptr_t mnt, uintptr_t va)
         x86_page_table* l2pt = (x86_page_table*)(mnt | (l1_index << 12));
         x86_pte_t l2pte = l2pt->entry[l2_index];
 
-        cpu_invplg(va);
+        cpu_flush_page(va);
         l2pt->entry[l2_index] = PTE_NULL;
 
         return PG_ENTRY_ADDR(l2pte);
@@ -105,17 +112,24 @@ vmm_del_mapping(uintptr_t mnt, uintptr_t va)
 }
 
 int
-vmm_lookup(uintptr_t va, v_mapping* mapping)
+vmm_lookup(ptr_t va, v_mapping* mapping)
 {
-    uint32_t l1_index = L1_INDEX(va);
-    uint32_t l2_index = L2_INDEX(va);
+    return vmm_lookupat(VMS_SELF, va, mapping);
+}
 
-    x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
+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*)L2_VADDR(l1_index))->entry[l2_index];
+          &((x86_page_table*)(mnt | (l1_index << 12)))->entry[l2_index];
+
         if (l2pte) {
             mapping->flags = PG_ENTRY_FLAGS(*l2pte);
             mapping->pa = PG_ENTRY_ADDR(*l2pte);
@@ -125,14 +139,15 @@ vmm_lookup(uintptr_t va, v_mapping* mapping)
             return 1;
         }
     }
+
     return 0;
 }
 
-void*
-vmm_v2p(void* va)
+ptr_t
+vmm_v2p(ptr_t va)
 {
-    uint32_t l1_index = L1_INDEX(va);
-    uint32_t l2_index = L2_INDEX(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];
@@ -140,26 +155,48 @@ vmm_v2p(void* va)
     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);
+            return PG_ENTRY_ADDR(*l2pte) | ((ptr_t)va & 0xfff);
         }
     }
     return 0;
 }
 
-void*
-vmm_mount_pd(uintptr_t mnt, void* pde)
+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];
+
+        if (l2pte) {
+            return PG_ENTRY_ADDR(*l2pte) | ((ptr_t)va & 0xfff);
+        }
+    }
+    return 0;
+}
+
+ptr_t
+vmm_mount_pd(ptr_t mnt, ptr_t 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);
+    cpu_flush_page(mnt);
     return mnt;
 }
 
-void*
-vmm_unmount_pd(uintptr_t mnt)
+ptr_t
+vmm_unmount_pd(ptr_t mnt)
 {
     x86_page_table* l1pt = (x86_page_table*)L1_BASE_VADDR;
     l1pt->entry[(mnt >> 22)] = 0;
-    cpu_invplg(mnt);
+    cpu_flush_page(mnt);
+    return mnt;
 }
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