mirror of
https://github.com/yourtion/30dayMakeOS.git
synced 2026-02-03 01:53:24 +08:00
整理memory.c
This commit is contained in:
Yourtion
@@ -1,5 +1,5 @@
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OBJS_BOOTPACK = bootpack.obj naskfunc.obj hankaku.obj graphic.obj dsctbl.obj \
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int.obj fifo.obj keyboard.obj mouse.obj
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int.obj fifo.obj keyboard.obj mouse.obj memory.obj
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TOOLPATH = ../z_tools/
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INCPATH = ../z_tools/haribote/
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@@ -3,24 +3,6 @@
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#include "bootpack.h"
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#include <stdio.h>
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#define MEMMAN_FREES 4090 /* 大约是32KB*/
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struct FREEINFO { /* 可用信息 */
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unsigned int addr, size;
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};
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struct MEMMAN { /* 内存管理 */
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int frees, maxfrees, lostsize, losts;
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struct FREEINFO free[MEMMAN_FREES];
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};
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unsigned int memtest(unsigned int start, unsigned int end);
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void memman_init(struct MEMMAN *man);
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unsigned int memman_total(struct MEMMAN *man);
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unsigned int memman_alloc(struct MEMMAN *man, unsigned int size);
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int memman_free(struct MEMMAN *man, unsigned int addr, unsigned int size);
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#define MEMMAN_ADDR 0x003c0000
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void HariMain(void)
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{
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struct BOOTINFO *binfo = (struct BOOTINFO *) ADR_BOOTINFO;
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@@ -111,146 +93,4 @@ void HariMain(void)
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}
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}
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}
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}
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#define EFLAGS_AC_BIT 0x00040000
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#define CR0_CACHE_DISABLE 0x60000000
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unsigned int memtest(unsigned int start, unsigned int end)
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{
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char flg486 = 0;
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unsigned int eflg, cr0, i;
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/* 确认CPU是386还是486以上的 */
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eflg = io_load_eflags();
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eflg |= EFLAGS_AC_BIT; /* AC-bit = 1 */
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io_store_eflags(eflg);
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eflg = io_load_eflags();
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if ((eflg & EFLAGS_AC_BIT) != 0) {
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/* 如果是386，即使设定AC=1，AC的值还会自动回到0 */
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flg486 = 1;
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}
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eflg &= ~EFLAGS_AC_BIT; /* AC-bit = 0 */
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io_store_eflags(eflg);
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if (flg486 != 0) {
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cr0 = load_cr0();
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cr0 |= CR0_CACHE_DISABLE; /* 禁止缓存 */
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store_cr0(cr0);
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}
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i = memtest_sub(start, end);
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if (flg486 != 0) {
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cr0 = load_cr0();
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cr0 &= ~CR0_CACHE_DISABLE; /* 允许缓存 */
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store_cr0(cr0);
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}
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return i;
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}
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void memman_init(struct MEMMAN *man){
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man->frees = 0; /* 可用信息数目 */
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man->maxfrees = 0; /* 用于观察可用状况：frees的最大值 */
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man->lostsize = 0; /* 释放失败的内存的大小总和 */
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man->losts = 0; /* 释放失败次数 */
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return;
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}
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unsigned int memman_total(struct MEMMAN *man)
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/* 报告空余内存大小的合计 */
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{
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unsigned int i, t = 0;
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for (i = 0; i < man->frees; i++) {
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t += man->free[i].size;
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}
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return t;
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}
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unsigned int memman_alloc(struct MEMMAN *man, unsigned int size)
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/* 分配 */
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{
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unsigned int i, a;
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for (i = 0; i < man->frees; i++) {
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if (man->free[i].size >= size) {
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/* 找到了足够大的内存 */
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a = man->free[i].addr;
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man->free[i].addr += size;
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man->free[i].size -= size;
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if (man->free[i].size == 0) {
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/* 如果free[i]变成了0，就减掉一条可用信息 */
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man->frees--;
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for (; i < man->frees; i++) {
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man->free[i] = man->free[i + 1]; /* 代入结构体 */
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}
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}
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return a;
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}
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}
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return 0; /* 没有可用空间 */
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}
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int memman_free(struct MEMMAN *man, unsigned int addr, unsigned int size)
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/* 释放 */
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{
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int i, j;
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/* 为便于归纳内存，将free[]按照addr的顺序排列 */
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/* 所以，先决定应该放在哪里 */
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for (i = 0; i < man->frees; i++) {
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if (man->free[i].addr > addr) {
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break;
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}
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}
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/* free[i - 1].addr < addr < free[i].addr */
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if (i > 0) {
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/* 前面有可用内存 */
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if (man->free[i - 1].addr + man->free[i - 1].size == addr) {
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/* 可以与前面的可用内存归纳到一起 */
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man->free[i - 1].size += size;
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if (i < man->frees) {
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/* 后面也有 */
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if (addr + size == man->free[i].addr) {
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/* 也可以与后面的可用内存归纳到一起 */
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man->free[i - 1].size += man->free[i].size;
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/* man->free[i]删除 */
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/* free[i]变成0后归纳到前面去 */
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man->frees--;
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for (; i < man->frees; i++) {
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man->free[i] = man->free[i + 1]; /* 结构体赋值 */
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}
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}
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}
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return 0; /* 成功完成 */
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}
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}
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/* 不能与前面的可用空间归纳到一起 */
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if (i < man->frees) {
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/* 后面还有 */
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if (addr + size == man->free[i].addr) {
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/* 可以与后面的内容归纳到一起 */
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man->free[i].addr = addr;
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man->free[i].size += size;
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return 0; /* 成功完成 */
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}
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}
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/* 既不能与前面归纳到一起，也不能与后面归纳到一起 */
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if (man->frees < MEMMAN_FREES) {
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/* free[i]之后的，向后移动，腾出一点可用空间 */
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for (j = man->frees; j > i; j--) {
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man->free[j] = man->free[j - 1];
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}
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man->frees++;
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if (man->maxfrees < man->frees) {
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man->maxfrees = man->frees; /* 更新最大值 */
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}
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man->free[i].addr = addr;
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man->free[i].size = size;
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return 0; /* 成功完成 */
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}
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/* 不能往后移动 */
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man->losts++;
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man->lostsize += size;
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return -1; /* 失败 */
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}
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}
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@@ -116,3 +116,21 @@ void inthandler2c(int *esp);
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void enable_mouse(struct MOUSE_DEC *mdec);
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int mouse_decode(struct MOUSE_DEC *mdec, unsigned char dat);
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extern struct FIFO8 mousefifo;
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/* memory.c */
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#define MEMMAN_FREES 4090 /* 大约是32KB*/
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#define MEMMAN_ADDR 0x003c0000
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struct FREEINFO { /* 可用信息 */
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unsigned int addr, size;
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};
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struct MEMMAN { /* 内存管理 */
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int frees, maxfrees, lostsize, losts;
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struct FREEINFO free[MEMMAN_FREES];
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};
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unsigned int memtest(unsigned int start, unsigned int end);
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void memman_init(struct MEMMAN *man);
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unsigned int memman_total(struct MEMMAN *man);
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unsigned int memman_alloc(struct MEMMAN *man, unsigned int size);
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int memman_free(struct MEMMAN *man, unsigned int addr, unsigned int size);
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145
10_day/memory.c
Normal file
145
10_day/memory.c
Normal file
@@ -0,0 +1,145 @@
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/* 内存管理 */
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#include "bootpack.h"
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#define EFLAGS_AC_BIT 0x00040000
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#define CR0_CACHE_DISABLE 0x60000000
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unsigned int memtest(unsigned int start, unsigned int end)
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{
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char flg486 = 0;
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unsigned int eflg, cr0, i;
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/* 确认CPU是386还是486以上的 */
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eflg = io_load_eflags();
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eflg |= EFLAGS_AC_BIT; /* AC-bit = 1 */
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io_store_eflags(eflg);
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eflg = io_load_eflags();
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if ((eflg & EFLAGS_AC_BIT) != 0) {
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/* 如果是386，即使设定AC=1，AC的值还会自动回到0 */
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flg486 = 1;
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}
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eflg &= ~EFLAGS_AC_BIT; /* AC-bit = 0 */
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io_store_eflags(eflg);
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if (flg486 != 0) {
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cr0 = load_cr0();
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cr0 |= CR0_CACHE_DISABLE; /* 禁止缓存 */
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store_cr0(cr0);
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}
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i = memtest_sub(start, end);
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if (flg486 != 0) {
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cr0 = load_cr0();
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cr0 &= ~CR0_CACHE_DISABLE; /* 允许缓存 */
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store_cr0(cr0);
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}
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return i;
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}
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void memman_init(struct MEMMAN *man){
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man->frees = 0; /* 可用信息数目 */
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man->maxfrees = 0; /* 用于观察可用状况：frees的最大值 */
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man->lostsize = 0; /* 释放失败的内存的大小总和 */
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man->losts = 0; /* 释放失败次数 */
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return;
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}
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unsigned int memman_total(struct MEMMAN *man)
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/* 报告空余内存大小的合计 */
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{
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unsigned int i, t = 0;
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for (i = 0; i < man->frees; i++) {
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t += man->free[i].size;
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}
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return t;
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}
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unsigned int memman_alloc(struct MEMMAN *man, unsigned int size)
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/* 分配 */
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{
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unsigned int i, a;
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for (i = 0; i < man->frees; i++) {
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if (man->free[i].size >= size) {
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/* 找到了足够大的内存 */
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a = man->free[i].addr;
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man->free[i].addr += size;
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man->free[i].size -= size;
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if (man->free[i].size == 0) {
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/* 如果free[i]变成了0，就减掉一条可用信息 */
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man->frees--;
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for (; i < man->frees; i++) {
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man->free[i] = man->free[i + 1]; /* 代入结构体 */
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}
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}
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return a;
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}
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}
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return 0; /* 没有可用空间 */
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}
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int memman_free(struct MEMMAN *man, unsigned int addr, unsigned int size)
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/* 释放 */
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{
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int i, j;
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/* 为便于归纳内存，将free[]按照addr的顺序排列 */
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/* 所以，先决定应该放在哪里 */
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for (i = 0; i < man->frees; i++) {
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if (man->free[i].addr > addr) {
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break;
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}
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}
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/* free[i - 1].addr < addr < free[i].addr */
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if (i > 0) {
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/* 前面有可用内存 */
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if (man->free[i - 1].addr + man->free[i - 1].size == addr) {
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/* 可以与前面的可用内存归纳到一起 */
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man->free[i - 1].size += size;
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if (i < man->frees) {
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/* 后面也有 */
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if (addr + size == man->free[i].addr) {
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/* 也可以与后面的可用内存归纳到一起 */
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man->free[i - 1].size += man->free[i].size;
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/* man->free[i]删除 */
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/* free[i]变成0后归纳到前面去 */
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man->frees--;
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for (; i < man->frees; i++) {
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man->free[i] = man->free[i + 1]; /* 结构体赋值 */
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}
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}
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}
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return 0; /* 成功完成 */
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}
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}
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/* 不能与前面的可用空间归纳到一起 */
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if (i < man->frees) {
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/* 后面还有 */
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if (addr + size == man->free[i].addr) {
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/* 可以与后面的内容归纳到一起 */
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man->free[i].addr = addr;
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man->free[i].size += size;
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return 0; /* 成功完成 */
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}
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}
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/* 既不能与前面归纳到一起，也不能与后面归纳到一起 */
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if (man->frees < MEMMAN_FREES) {
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/* free[i]之后的，向后移动，腾出一点可用空间 */
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for (j = man->frees; j > i; j--) {
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man->free[j] = man->free[j - 1];
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}
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man->frees++;
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if (man->maxfrees < man->frees) {
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man->maxfrees = man->frees; /* 更新最大值 */
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}
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man->free[i].addr = addr;
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man->free[i].size = size;
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return 0; /* 成功完成 */
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}
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/* 不能往后移动 */
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man->losts++;
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man->lostsize += size;
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return -1; /* 失败 */
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}
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