feat: No more kernel page table switching upon interrupt.

[lunaix-os.git] / lunaix-os / includes / lunaix / mm / page.h

diff --git a/lunaix-os/includes/lunaix/mm/page.h b/lunaix-os/includes/lunaix/mm/page.h
index 29232580b6afeca0fb4e8a45da68f1bc1ace96cc..35a1b471e96b37f48c360c93fcddfc7ecdbfe465 100644 (file)
--- a/lunaix-os/includes/lunaix/mm/page.h
+++ b/lunaix-os/includes/lunaix/mm/page.h
@@ -1,20 +1,26 @@
 #ifndef __LUNAIX_PAGE_H
 #define __LUNAIX_PAGE_H
 #include <stdint.h>
-#include <lunaix/constants.h>
+#include <lunaix/common.h>
+
+#define PG_SIZE_BITS                12
+#define PG_SIZE                     (1 << PG_SIZE_BITS)
+#define PG_INDEX_BITS               10
 
 #define PG_MAX_ENTRIES              1024U
 #define PG_LAST_TABLE               PG_MAX_ENTRIES - 1
 #define PG_FIRST_TABLE              0
 
+#define PTE_NULL                    0
+
 #define P2V(paddr)          ((uintptr_t)(paddr)  +  HIGHER_HLF_BASE)
 #define V2P(vaddr)          ((uintptr_t)(vaddr)  -  HIGHER_HLF_BASE)
 
 #define PG_ALIGN(addr)      ((uintptr_t)(addr)   & 0xFFFFF000UL)
 
-#define PD_INDEX(vaddr)     (((uintptr_t)(vaddr) & 0xFFC00000UL) >> 22)
-#define PT_INDEX(vaddr)     (((uintptr_t)(vaddr) & 0x003FF000UL) >> 12)
-#define PG_OFFSET(vaddr)    ((uintptr_t)(vaddr)  & 0x00000FFFUL)
+#define L1_INDEX(vaddr)     (uint32_t)(((uintptr_t)(vaddr) & 0xFFC00000UL) >> 22)
+#define L2_INDEX(vaddr)     (uint32_t)(((uintptr_t)(vaddr) & 0x003FF000UL) >> 12)
+#define PG_OFFSET(vaddr)    (uint32_t)((uintptr_t)(vaddr)  & 0x00000FFFUL)
 
 #define GET_PT_ADDR(pde)    PG_ALIGN(pde)
 #define GET_PG_ADDR(pte)    PG_ALIGN(pte)
@@ -27,36 +33,80 @@
 #define PG_PRESENT              (0x1)
 #define PG_WRITE                (0x1 << 1)
 #define PG_ALLOW_USER           (0x1 << 2)
-#define PG_WRITE_THROUGHT       (1 << 3)
+#define PG_WRITE_THROUGH       (1 << 3)
 #define PG_DISABLE_CACHE        (1 << 4)
 #define PG_PDE_4MB              (1 << 7)
 
-#define PDE(flags, pt_addr)     (PG_ALIGN(pt_addr) | ((flags) & 0xfff))
-#define PTE(flags, pg_addr)     (PG_ALIGN(pg_addr) | ((flags) & 0xfff))
+#define NEW_L1_ENTRY(flags, pt_addr)     (PG_ALIGN(pt_addr) | (((flags) | PG_WRITE_THROUGH) & 0xfff))
+#define NEW_L2_ENTRY(flags, pg_addr)     (PG_ALIGN(pg_addr) | ((flags) & 0xfff))
 
 #define V_ADDR(pd, pt, offset)  ((pd) << 22 | (pt) << 12 | (offset))
 #define P_ADDR(ppn, offset)     ((ppn << 12) | (offset))
 
-// 用于对PD进行循环映射，因为我们可能需要对PD进行频繁操作，我们在这里禁用TLB缓存
+#define PG_ENTRY_FLAGS(entry)   ((entry) & 0xFFFU)
+#define PG_ENTRY_ADDR(entry)   ((entry) & ~0xFFFU)
+
+#define HAS_FLAGS(entry, flags)             ((PG_ENTRY_FLAGS(entry) & (flags)) == flags)
+#define CONTAINS_FLAGS(entry, flags)        (PG_ENTRY_FLAGS(entry) & (flags))
+
 #define PG_PREM_R              PG_PRESENT
 #define PG_PREM_RW             PG_PRESENT | PG_WRITE
 #define PG_PREM_UR             PG_PRESENT | PG_ALLOW_USER
 #define PG_PREM_URW            PG_PRESENT | PG_WRITE | PG_ALLOW_USER
-#define T_SELF_REF_PERM        PG_PREM_RW | PG_DISABLE_CACHE
+
+// 用于对PD进行循环映射，因为我们可能需要对PD进行频繁操作，我们在这里禁用TLB缓存
+#define T_SELF_REF_PERM        PG_PREM_RW | PG_DISABLE_CACHE | PG_WRITE_THROUGH
 
 
 // 页目录的虚拟基地址，可以用来访问到各个PDE
-#define PTD_BASE_VADDR                0xFFFFF000U
+#define L1_BASE_VADDR                0xFFFFF000U
 
 // 页表的虚拟基地址，可以用来访问到各个PTE
-#define PT_BASE_VADDR                 0xFFC00000U
+#define L2_BASE_VADDR                 0xFFC00000U
 
 // 用来获取特定的页表的虚拟地址
-#define PT_VADDR(pd_offset)           (PT_BASE_VADDR | (pd_offset << 12))
+#define L2_VADDR(pd_offset)           (L2_BASE_VADDR | (pd_offset << 12))
 
 typedef unsigned long ptd_t;
 typedef unsigned long pt_t;
 typedef unsigned int pt_attr;
-
+typedef uint32_t x86_pte_t;
+
+/**
+ * @brief 虚拟映射属性
+ * 
+ */
+typedef struct {
+    // 物理页码（如果不存在映射，则为0）
+    uint32_t pn;
+    // 物理页地址（如果不存在映射，则为0）
+    uintptr_t pa;
+    // 映射的flags
+    uint16_t flags;
+    // PTE地址
+    x86_pte_t *pte;
+} v_mapping;
+
+typedef struct
+{
+    x86_pte_t entry[PG_MAX_ENTRIES];
+} __attribute__((packed)) x86_page_table;
+
+
+extern void __pg_mount_point;
+
+/* 四个页挂载点，两个页目录挂载点： 用于临时创建&编辑页表 */
+
+#define PD_MOUNT_1          0xAFC00000
+#define PD_MOUNT_2          0xAF800000
+#define PG_MOUNT_BASE       0xAF7FF000
+#define PG_MOUNT_1          (PG_MOUNT_BASE)
+#define PG_MOUNT_2          (PG_MOUNT_BASE - 0x1000)
+#define PG_MOUNT_3          (PG_MOUNT_BASE - 0x2000)
+#define PG_MOUNT_4          (PG_MOUNT_BASE - 0x3000)
+#define PD_REFERENCED       L2_BASE_VADDR
+
+#define CURPROC_PTE(vpn)     (&((x86_page_table*)(PD_MOUNT_1 | (((vpn) & 0xffc00) << 2)))->entry[(vpn) & 0x3ff])
+#define PTE_MOUNTED(mnt, vpn)     (((x86_page_table*)((mnt) | (((vpn) & 0xffc00) << 2)))->entry[(vpn) & 0x3ff])
 
 #endif /* __LUNAIX_PAGE_H */