From: acevest <zhaoyanbai@126.com>
Date: Wed, 17 May 2023 14:55:44 +0000 (+0800)
Subject: get_npd -> get_npde; get_npt -> get_npte
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zpipe.c?a=commitdiff_plain;h=f04eda4c1e59288baf27dd1ac6ad5cea260edae6;p=kernel.git

get_npd -> get_npde; get_npt -> get_npte
---

diff --git a/include/page.h b/include/page.h
index daa3dfe..50b7c2a 100644
--- a/include/page.h
+++ b/include/page.h
@@ -17,6 +17,19 @@
 #ifndef _PAGE_H
 #define _PAGE_H
 
+/*
+
+| CR0的PG | CR4的PAE | CR4的PSE | PDE的PS | 页面规模 | 物理地址规模 |
+| ------- | -------- | -------- | ------- | -------- | ------------ |
+| 0       | ×       | ×       | ×      | ―      | 禁止分页 |
+| 1       | 0        | 0        | ×      | 4KB      | 32位        |
+| 1       | 0        | 1        | 0       | 4KB      | 32位        |
+| 1       | 0        | 1        | 1       | 4MB      | 32位        |
+| 1       | 1        | ×       | 0       | 4KB      | 36位        |
+| 1       | 1        | ×       | 1       | 2MB      | 36位        |
+
+*/
+
 #define PAGE_P 0x1   // 在内存中
 #define PAGE_WR 0x2  // 表示可读写
 #define PAGE_US 0x4  // 用户级
@@ -31,8 +44,8 @@
 #ifndef ASM
 #include <bits.h>
 #include <types.h>
-#define get_npd(addr) (((u32)(addr)) >> 22)
-#define get_npt(addr) ((((u32)(addr)) >> 12) & 0x3FF)
+#define get_npde(addr) (((u32)(addr)) >> 22)
+#define get_npte(addr) ((((u32)(addr)) >> 12) & 0x3FF)
 
 #include <list.h>
 
diff --git a/mm/mm.c b/mm/mm.c
index 0e7c1f2..1626bb6 100644
--- a/mm/mm.c
+++ b/mm/mm.c
@@ -31,11 +31,11 @@ pte_t __initdata init_pgt[PTECNT_PER_PAGE * BOOT_INIT_PAGETBL_CNT] __attribute__
 void set_page_shared(void *x) {
     unsigned long addr = (unsigned long)x;
     addr = PAGE_ALIGN(addr);
-    unsigned int npd = get_npd(addr);
+    unsigned int npd = get_npde(addr);
     init_pgd[npd] |= PAGE_US;
 
     pte_t *pte = pa2va(init_pgd[npd] & PAGE_MASK);
-    pte[get_npt(addr)] |= PAGE_US;
+    pte[get_npte(addr)] |= PAGE_US;
 }
 
 void init_paging() {
@@ -59,7 +59,7 @@ void init_paging() {
 
             memset((void *)pgtb_addr, 0, PAGE_SIZE);
 
-            init_pgd[get_npd(page_addr)] = (pde_t)((unsigned long)va2pa(pgtb_addr) | PAGE_P | PAGE_WR);
+            init_pgd[get_npde(page_addr)] = (pde_t)((unsigned long)va2pa(pgtb_addr) | PAGE_P | PAGE_WR);
         }
 
         pte = ((pte_t *)pgtb_addr) + ti;
@@ -67,7 +67,7 @@ void init_paging() {
     }
 
     // paging for kernel space
-    unsigned long delta = get_npd(PAGE_OFFSET);
+    unsigned long delta = get_npde(PAGE_OFFSET);
     for (i = delta; i < PDECNT_PER_PAGE; ++i) {
         init_pgd[i] = init_pgd[i - delta];
         init_pgd[i - delta] = 0;
@@ -75,14 +75,14 @@ void init_paging() {
 
     // 接下来为显存建立页映射
     unsigned long vram_phys_addr = system.vbe_phys_addr;
-    for (int pde_inx = 0; pde_inx < get_npd(VRAM_VADDR_SIZE); pde_inx++) {
+    for (int pde_inx = 0; pde_inx < get_npde(VRAM_VADDR_SIZE); pde_inx++) {
         pgtb_addr = (unsigned long *)(alloc_from_bootmem(PAGE_SIZE, "vrampaging"));
         if (0 == pgtb_addr) {
             panic("no pages for paging...");
         }
         // 后续要初始化，所以此处不用memset
         // memset((void *)pgtb_addr, 0, PAGE_SIZE);
-        init_pgd[get_npd(VRAM_VADDR_BASE) + pde_inx] = (pde_t)((unsigned long)va2pa(pgtb_addr) | PAGE_P | PAGE_WR);
+        init_pgd[get_npde(VRAM_VADDR_BASE) + pde_inx] = (pde_t)((unsigned long)va2pa(pgtb_addr) | PAGE_P | PAGE_WR);
 
         for (int pte_inx = 0; pte_inx < PTECNT_PER_PAGE; pte_inx++) {
             pgtb_addr[pte_inx] = vram_phys_addr | PAGE_P | PAGE_WR;
diff --git a/mm/page.c b/mm/page.c
index 4a9f54e..6ac0e51 100644
--- a/mm/page.c
+++ b/mm/page.c
@@ -24,8 +24,8 @@ void do_no_page(void *addr) {
     unsigned long page = alloc_one_page(0);
     assert(page != 0);
 
-    int npde = get_npd(addr);
-    int npte = get_npt(addr);
+    int npde = get_npde(addr);
+    int npte = get_npte(addr);
 
     if (page_dir[npde] == 0) {
         page_tbl = (pte_t *)alloc_one_page(0);
@@ -48,8 +48,8 @@ void do_wp_page(void *addr) {
         panic("%s invalid addr", __func__);
     }
 
-    int npde = get_npd(addr);
-    int npte = get_npt(addr);
+    int npde = get_npde(addr);
+    int npte = get_npte(addr);
 
     pde_t *page_dir = (pde_t *)pa2va(current->cr3);
     pte_t *page_tbl = pa2va(PAGE_ALIGN(page_dir[npde]));