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🔧 对物理页的管理功能进行了一些调整

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This commit is contained in:
fslongjin 2022-02-28 22:26:15 +08:00
parent 7d8f89622d
commit be1c838ff0
4 changed files with 235 additions and 106 deletions
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74
kernel/main.c
View File

@ -14,7 +14,6 @@
#include "syscall/syscall.h" #include "syscall/syscall.h"
unsigned int *FR_address = (unsigned int *)0xb8000; //帧缓存区的地址 unsigned int *FR_address = (unsigned int *)0xb8000; //帧缓存区的地址
// char fxsave_region[512] __attribute__((aligned(16)));
struct memory_desc memory_management_struct = {{0}, 0}; struct memory_desc memory_management_struct = {{0}, 0};
// struct Global_Memory_Descriptor memory_management_struct = {{0}, 0}; // struct Global_Memory_Descriptor memory_management_struct = {{0}, 0};
@ -39,26 +38,52 @@ void show_welcome()
} }
// 测试内存管理单元 // 测试内存管理单元
/*
void test_mm() void test_mm()
{ {
kinfo("Testing memory management unit..."); kinfo("Testing memory management unit...");
//printk("bmp[0]:%#018x\tbmp[1]%#018lx\n", *memory_management_struct.bmp, *(memory_management_struct.bmp + 1)); struct Page *page = NULL;
kinfo("Try to allocate 64 memory pages."); page = alloc_pages(ZONE_NORMAL, 63, 0);
struct Page *page = alloc_pages(ZONE_NORMAL, 64, PAGE_PGT_MAPPED | PAGE_ACTIVE | PAGE_KERNEL); page = alloc_pages(ZONE_NORMAL, 63, 0);
for (int i = 0; i <= 65; ++i) printk_color(ORANGE, BLACK, "4.memory_management_struct.bmp:%#018lx\tmemory_management_struct.bmp+1:%#018lx\tmemory_management_struct.bmp+2:%#018lx\tzone_struct->count_pages_using:%d\tzone_struct->count_pages_free:%d\n", *memory_management_struct.bmp, *(memory_management_struct.bmp + 1), *(memory_management_struct.bmp + 2), memory_management_struct.zones_struct->count_pages_using, memory_management_struct.zones_struct->count_pages_free);
for (int i = 80; i <= 85; ++i)
{ {
printk("page%d\tattr:%#018lx\tphys_addr:%#018lx\t", i, page->attr, page->addr_phys); printk_color(INDIGO, BLACK, "page%03d attr:%#018lx address:%#018lx\t", i, (memory_management_struct.pages_struct + i)->attr, (memory_management_struct.pages_struct + i)->addr_phys);
++page; i++;
if (((i + 1) % 2) == 0) printk_color(INDIGO, BLACK, "page%03d attr:%#018lx address:%#018lx\n", i, (memory_management_struct.pages_struct + i)->attr, (memory_management_struct.pages_struct + i)->addr_phys);
printk("\n");
} }
for (int i = 140; i <= 145; i++)
{
printk_color(INDIGO, BLACK, "page%03d attr:%#018lx address:%#018lx\t", i, (memory_management_struct.pages_struct + i)->attr, (memory_management_struct.pages_struct + i)->addr_phys);
i++;
printk_color(INDIGO, BLACK, "page%03d attr:%#018lx address:%#018lx\n", i, (memory_management_struct.pages_struct + i)->attr, (memory_management_struct.pages_struct + i)->addr_phys);
}
printk("bmp[0]:%#018x\tbmp[1]%#018lx\n", *(memory_management_struct.bmp), *(memory_management_struct.bmp + 1)); free_pages(page, 1);
printk_color(ORANGE, BLACK, "5.memory_management_struct.bmp:%#018lx\tmemory_management_struct.bmp+1:%#018lx\tmemory_management_struct.bmp+2:%#018lx\tzone_struct->count_pages_using:%d\tzone_struct->count_pages_free:%d\n", *memory_management_struct.bmp, *(memory_management_struct.bmp + 1), *(memory_management_struct.bmp + 2), memory_management_struct.zones_struct->count_pages_using, memory_management_struct.zones_struct->count_pages_free);
for (int i = 75; i <= 85; i++)
{
printk_color(INDIGO, BLACK, "page%03d attr:%#018lx address:%#018lx\t", i, (memory_management_struct.pages_struct + i)->attr, (memory_management_struct.pages_struct + i)->addr_phys);
i++;
printk_color(INDIGO, BLACK, "page%03d attr:%#018lx address:%#018lx\n", i, (memory_management_struct.pages_struct + i)->attr, (memory_management_struct.pages_struct + i)->addr_phys);
}
page = alloc_pages(ZONE_UNMAPPED_IN_PGT, 63, 0);
printk_color(ORANGE, BLACK, "6.memory_management_struct.bmp:%#018lx\tmemory_management_struct.bmp+1:%#018lx\tzone_struct->count_pages_using:%d\tzone_struct->count_pages_free:%d\n", *(memory_management_struct.bmp + (page->addr_phys >> PAGE_2M_SHIFT >> 6)), *(memory_management_struct.bmp + 1 + (page->addr_phys >> PAGE_2M_SHIFT >> 6)), (memory_management_struct.zones_struct + ZONE_UNMAPPED_INDEX)->count_pages_using, (memory_management_struct.zones_struct + ZONE_UNMAPPED_INDEX)->count_pages_free);
free_pages(page, 1);
printk_color(ORANGE, BLACK, "7.memory_management_struct.bmp:%#018lx\tmemory_management_struct.bmp+1:%#018lx\tzone_struct->count_pages_using:%d\tzone_struct->count_pages_free:%d\n", *(memory_management_struct.bmp + (page->addr_phys >> PAGE_2M_SHIFT >> 6)), *(memory_management_struct.bmp + 1 + (page->addr_phys >> PAGE_2M_SHIFT >> 6)), (memory_management_struct.zones_struct + ZONE_UNMAPPED_INDEX)->count_pages_using, (memory_management_struct.zones_struct + ZONE_UNMAPPED_INDEX)->count_pages_free);
test_slab();
kinfo("Memory management module test completed!");
} }
*/
void test_slab() void test_slab()
{ {
@ -84,25 +109,23 @@ void test_slab()
} }
// 测试自动扩容 // 测试自动扩容
kmalloc(kmalloc_cache_group[15].size, 0); void *ptrs[7];
kmalloc(kmalloc_cache_group[15].size, 0); for (int i = 0; i < 7; ++i)
kmalloc(kmalloc_cache_group[15].size, 0); ptrs[i] = kmalloc(kmalloc_cache_group[15].size, 0);
kmalloc(kmalloc_cache_group[15].size, 0);
kmalloc(kmalloc_cache_group[15].size, 0);
kmalloc(kmalloc_cache_group[15].size, 0);
kmalloc(kmalloc_cache_group[15].size, 0);
struct slab_obj *slab_obj_ptr = kmalloc_cache_group[15].cache_pool_entry; struct slab_obj *slab_obj_ptr = kmalloc_cache_group[15].cache_pool_entry;
int count=0; int count = 0;
do do
{ {
kdebug("bmp(%d): addr=%#018lx\t value=%#018lx", count, slab_obj_ptr->bmp, *slab_obj_ptr->bmp); kdebug("bmp(%d): addr=%#018lx\t value=%#018lx", count, slab_obj_ptr->bmp, *slab_obj_ptr->bmp);
slab_obj_ptr = container_of(list_next(&slab_obj_ptr->list), struct slab_obj, list); slab_obj_ptr = container_of(list_next(&slab_obj_ptr->list), struct slab_obj, list);
++count; ++count;
} while (slab_obj_ptr != kmalloc_cache_group[15].cache_pool_entry); } while (slab_obj_ptr != kmalloc_cache_group[15].cache_pool_entry);
for (int i = 0; i < 7; ++i)
kfree(ptrs[i]);
kinfo("SLAB test completed!"); kinfo("SLAB test completed!");
} }
// 初始化系统各模块 // 初始化系统各模块
@ -133,9 +156,10 @@ void system_initialize()
cpu_init(); cpu_init();
test_slab(); // test_slab();
// 再初始化进程模块。顺序不能调转 test_mm();
// process_init(); // 再初始化进程模块。顺序不能调转
// process_init();
} }
//操作系统内核从这里开始执行 //操作系统内核从这里开始执行

196
kernel/mm/mm.c
View File

@ -141,33 +141,30 @@ void mm_init()
memory_management_struct.pages_struct->zone = memory_management_struct.zones_struct; memory_management_struct.pages_struct->zone = memory_management_struct.zones_struct;
memory_management_struct.pages_struct->addr_phys = 0UL; memory_management_struct.pages_struct->addr_phys = 0UL;
memory_management_struct.pages_struct->attr = 0; set_page_attr(memory_management_struct.pages_struct, PAGE_PGT_MAPPED | PAGE_KERNEL_INIT | PAGE_KERNEL);
memory_management_struct.pages_struct->ref_counts = 0; memory_management_struct.pages_struct->ref_counts = 1;
memory_management_struct.pages_struct->age = 0; memory_management_struct.pages_struct->age = 0;
// 将第0页的标志位给置上
//*(memory_management_struct.bmp) |= 1UL;
// 计算zone结构体的总长度（按照64位对齐） // 计算zone结构体的总长度（按照64位对齐）
memory_management_struct.zones_struct_len = (memory_management_struct.count_zones * sizeof(struct Zone) + sizeof(ul) - 1) & (~(sizeof(ul) - 1)); memory_management_struct.zones_struct_len = (memory_management_struct.count_zones * sizeof(struct Zone) + sizeof(ul) - 1) & (~(sizeof(ul) - 1));
/* ZONE_DMA_INDEX = 0;
printk_color(ORANGE, BLACK, "bmp:%#18lx, bmp_len:%#18lx, bits_size:%#18lx\n", memory_management_struct.bmp, memory_management_struct.bmp_len, memory_management_struct.bits_size); ZONE_NORMAL_INDEX = 0;
ZONE_UNMAPPED_INDEX = 0;
printk_color(ORANGE, BLACK, "pages_struct:%#18lx, count_pages:%#18lx, pages_struct_len:%#18lx\n", memory_management_struct.pages_struct, memory_management_struct.count_pages, memory_management_struct.pages_struct_len); for (int i = 0; i < memory_management_struct.count_zones; ++i)
printk_color(ORANGE, BLACK, "zones_struct:%#18lx, count_zones:%#18lx, zones_struct_len:%#18lx\n", memory_management_struct.zones_struct, memory_management_struct.count_zones, memory_management_struct.zones_struct_len);
*/
ZONE_DMA_INDEX = 0; // need rewrite in the future
ZONE_NORMAL_INDEX = 0; // need rewrite in the future
for (int i = 0; i < memory_management_struct.count_zones; ++i) // need rewrite in the future
{ {
struct Zone *z = memory_management_struct.zones_struct + i; struct Zone *z = memory_management_struct.zones_struct + i;
// printk_color(ORANGE, BLACK, "zone_addr_start:%#18lx, zone_addr_end:%#18lx, zone_length:%#18lx, pages_group:%#18lx, count_pages:%#18lx\n", // printk_color(ORANGE, BLACK, "zone_addr_start:%#18lx, zone_addr_end:%#18lx, zone_length:%#18lx, pages_group:%#18lx, count_pages:%#18lx\n",
// z->zone_addr_start, z->zone_addr_end, z->zone_length, z->pages_group, z->count_pages); // z->zone_addr_start, z->zone_addr_end, z->zone_length, z->pages_group, z->count_pages);
// 1GB以上的内存空间不做映射 // 1GB以上的内存空间不做映射
if (z->zone_addr_start == 0x100000000) if (z->zone_addr_start >= 0x100000000 && (!ZONE_UNMAPPED_INDEX))
ZONE_UNMAPED_INDEX = i; ZONE_UNMAPPED_INDEX = i;
} }
kdebug("ZONE_DMA_INDEX=%d\tZONE_NORMAL_INDEX=%d\tZONE_UNMAPPED_INDEX=%d", ZONE_DMA_INDEX, ZONE_NORMAL_INDEX, ZONE_UNMAPPED_INDEX);
// 设置内存页管理结构的地址，预留了一段空间，防止内存越界。 // 设置内存页管理结构的地址，预留了一段空间，防止内存越界。
memory_management_struct.end_of_struct = (ul)((ul)memory_management_struct.zones_struct + memory_management_struct.zones_struct_len + sizeof(long) * 32) & (~(sizeof(long) - 1)); memory_management_struct.end_of_struct = (ul)((ul)memory_management_struct.zones_struct + memory_management_struct.zones_struct_len + sizeof(long) * 32) & (~(sizeof(long) - 1));
@ -177,16 +174,31 @@ void mm_init()
// 初始化内存管理单元结构所占的物理页的结构体 // 初始化内存管理单元结构所占的物理页的结构体
ul mms_max_page = (virt_2_phys(memory_management_struct.end_of_struct) >> PAGE_2M_SHIFT); // 内存管理单元所占据的序号最大的物理页 ul mms_max_page = (virt_2_phys(memory_management_struct.end_of_struct) >> PAGE_2M_SHIFT); // 内存管理单元所占据的序号最大的物理页
printk("mms_max_page=%ld\n", mms_max_page); kdebug("mms_max_page=%ld", mms_max_page);
for (ul j = 0; j <= mms_max_page; ++j)
struct Page *tmp_page = NULL;
ul page_num;
// 第0个page已经在上方配置
for (ul j = 1; j <= mms_max_page; ++j)
{ {
page_init(memory_management_struct.pages_struct + j, PAGE_PGT_MAPPED | PAGE_KERNEL | PAGE_KERNEL_INIT | PAGE_ACTIVE); tmp_page = memory_management_struct.pages_struct + j;
page_init(tmp_page, PAGE_PGT_MAPPED | PAGE_KERNEL | PAGE_KERNEL_INIT);
page_num = tmp_page->addr_phys >> PAGE_2M_SHIFT;
*(memory_management_struct.bmp + (page_num >> 6)) |= (1UL << (page_num % 64));
++tmp_page->zone->count_pages_using;
--tmp_page->zone->count_pages_free;
} }
global_CR3 = get_CR3(); global_CR3 = get_CR3();
flush_tlb(); flush_tlb();
kdebug("global_CR3\t:%#018lx", global_CR3);
kdebug("*global_CR3\t:%#018lx", *phys_2_virt(global_CR3) & (~0xff));
kdebug("**global_CR3\t:%#018lx", *phys_2_virt(*phys_2_virt(global_CR3) & (~0xff)) & (~0xff));
kdebug("1.memory_management_struct.bmp:%#018lx\tzone->count_pages_using:%d\tzone_struct->count_pages_free:%d", *memory_management_struct.bmp, memory_management_struct.zones_struct->count_pages_using, memory_management_struct.zones_struct->count_pages_free);
kinfo("Memory management unit initialize complete!"); kinfo("Memory management unit initialize complete!");
// 初始化slab内存池 // 初始化slab内存池
@ -198,12 +210,21 @@ void mm_init()
* *
* @param page 内存页结构体 * @param page 内存页结构体
* @param flags 标志位 * @param flags 标志位
* 对于新页面： 初始化struct page * 本函数只负责初始化内存页，允许对同一页面进行多次初始化
* 对于当前页面属性/flags中含有引用属性或共享属性时，则只增加struct page和struct zone的被引用计数。否则就只是添加页表属性，并置位bmp的相应位。 * 而维护计数器及置位bmp标志位的功能，应当在分配页面的时候手动完成
* @return unsigned long * @return unsigned long
*/ */
unsigned long page_init(struct Page *page, ul flags) unsigned long page_init(struct Page *page, ul flags)
{ {
page->attr |= flags;
// 若页面的引用计数为0或是共享页，增加引用计数
if ((!page->ref_counts) || (page->attr & PAGE_SHARED))
{
++page->ref_counts;
++page->zone->total_pages_link;
}
return 0;
/*
// 全新的页面 // 全新的页面
if (!page->attr) if (!page->attr)
{ {
@ -231,37 +252,48 @@ unsigned long page_init(struct Page *page, ul flags)
page->attr |= flags; page->attr |= flags;
} }
return 0; return 0;
*/
} }
/** /**
* @brief 从已初始化的页结构中搜索符合申请条件的、连续num个struct page * @brief 从已初始化的页结构中搜索符合申请条件的、连续num个struct page
* *
* @param zone_select 选择内存区域, 可选项：dma, mapped in pgt(normal), unmapped in pgt * @param zone_select 选择内存区域, 可选项：dma, mapped in pgt(normal), unmapped in pgt
* @param num 需要申请的连续内存页的数量 num<=64 * @param num 需要申请的连续内存页的数量 num<64
* @param flags 将页面属性设置成flag * @param flags 将页面属性设置成flag
* @return struct Page* * @return struct Page*
*/ */
struct Page *alloc_pages(unsigned int zone_select, int num, ul flags) struct Page *alloc_pages(unsigned int zone_select, int num, ul flags)
{ {
ul zone_start = 0, zone_end = 0; ul zone_start = 0, zone_end = 0;
if (num >= 64 && num <= 0)
{
kerror("alloc_pages(): num is invalid.");
return NULL;
}
ul attr = flags;
switch (zone_select) switch (zone_select)
{ {
case ZONE_DMA: case ZONE_DMA:
// DMA区域 // DMA区域
zone_start = 0; zone_start = 0;
zone_end = ZONE_DMA_INDEX; zone_end = ZONE_DMA_INDEX;
attr |= PAGE_PGT_MAPPED;
break; break;
case ZONE_NORMAL: case ZONE_NORMAL:
zone_start = ZONE_DMA_INDEX; zone_start = ZONE_DMA_INDEX;
zone_end = ZONE_NORMAL_INDEX; zone_end = ZONE_NORMAL_INDEX;
attr |= PAGE_PGT_MAPPED;
break; break;
case ZONE_UNMAPPED_IN_PGT: case ZONE_UNMAPPED_IN_PGT:
zone_start = ZONE_NORMAL_INDEX; zone_start = ZONE_NORMAL_INDEX;
zone_end = ZONE_UNMAPED_INDEX; zone_end = ZONE_UNMAPPED_INDEX;
attr = 0;
break; break;
default: default:
kwarn("In alloc_pages: param: zone_select incorrect."); kerror("In alloc_pages: param: zone_select incorrect.");
// 返回空 // 返回空
return NULL; return NULL;
break; break;
@ -274,30 +306,36 @@ struct Page *alloc_pages(unsigned int zone_select, int num, ul flags)
struct Zone *z = memory_management_struct.zones_struct + i; struct Zone *z = memory_management_struct.zones_struct + i;
// 区域对应的起止页号以及区域拥有的页面数 // 区域对应的起止页号
ul page_start = (z->zone_addr_start >> PAGE_2M_SHIFT); ul page_start = (z->zone_addr_start >> PAGE_2M_SHIFT);
ul page_end = (z->zone_addr_end >> PAGE_2M_SHIFT); ul page_end = (z->zone_addr_end >> PAGE_2M_SHIFT);
ul page_num = (z->zone_length >> PAGE_2M_SHIFT);
ul tmp = 64 - page_start % 64; ul tmp = 64 - page_start % 64;
for (ul j = page_start; j <= page_end; j += ((j % 64) ? tmp : 64)) for (ul j = page_start; j < page_end; j += ((j % 64) ? tmp : 64))
{ {
// 按照bmp中的每一个元素进行查找 // 按照bmp中的每一个元素进行查找
// 先将p定位到bmp的起始元素 // 先将p定位到bmp的起始元素
ul *p = memory_management_struct.bmp + (j >> 6); ul *p = memory_management_struct.bmp + (j >> 6);
ul shift = j % 64; ul shift = j % 64;
ul tmp_num = ((1UL << num) - 1);
for (ul k = shift; k < 64 - shift; ++k) for (ul k = shift; k < 64; ++k)
{ {
// 寻找连续num个空页 // 寻找连续num个空页
if (!(((*p >> k) | (*(p + 1) << (64 - k))) & (num == 64 ? 0xffffffffffffffffUL : ((1UL << num) - 1)))) if (!((k ? ((*p >> k) | (*(p + 1) << (64 - k))) : *p) & tmp_num))
{ {
ul start_page_num = j + k - shift; // 计算得到要开始获取的内存页的页号（书上的公式有问题，这个是改过之后的版本） ul start_page_num = j + k - shift; // 计算得到要开始获取的内存页的页号
for (ul l = 0; l < num; ++l) for (ul l = 0; l < num; ++l)
{ {
struct Page *x = memory_management_struct.pages_struct + start_page_num + l; struct Page *x = memory_management_struct.pages_struct + start_page_num + l;
page_init(x, flags);
// 分配页面，手动配置属性及计数器
// 置位bmp
*(memory_management_struct.bmp + ((x->addr_phys >> PAGE_2M_SHIFT) >> 6)) |= (1UL << (x->addr_phys >> PAGE_2M_SHIFT) % 64);
++z->count_pages_using;
--z->count_pages_free;
x->attr = attr;
} }
// 成功分配了页面，返回第一个页面的指针 // 成功分配了页面，返回第一个页面的指针
// printk("start page num=%d\n",start_page_num); // printk("start page num=%d\n",start_page_num);
@ -309,44 +347,94 @@ struct Page *alloc_pages(unsigned int zone_select, int num, ul flags)
return NULL; return NULL;
} }
/**
* @brief 清除页面的引用计数， 计数为0时清空除页表已映射以外的所有属性
*
* @param p 物理页结构体
* @return unsigned long
*/
unsigned long page_clean(struct Page *p) unsigned long page_clean(struct Page *p)
{ {
if (!p->attr) --p->ref_counts;
p->attr = 0; --p->zone->total_pages_link;
else if ((p->attr & PAGE_REFERENCED) || (p->attr & PAGE_K_SHARE_TO_U))
{
// 被引用的页或内核共享给用户态的页
--p->ref_counts;
--p->zone->total_pages_link;
// 当引用为0时 // 若引用计数为空，则清空除PAGE_PGT_MAPPED以外的所有属性
if (!p->ref_counts) if (!p->ref_counts)
{ {
p->attr = 0; p->attr &= PAGE_PGT_MAPPED;
--p->zone->count_pages_using; }
++p->zone->count_pages_free; return 0;
} }
/**
* @brief Get the page's attr
*
* @param page 内存页结构体
* @return ul 属性
*/
ul get_page_attr(struct Page *page)
{
if (page == NULL)
{
kBUG("get_page_attr(): page == NULL");
return EPAGE_NULL;
}
else
return page->attr;
}
/**
* @brief Set the page's attr
*
* @param page 内存页结构体
* @param flags 属性
* @return ul 错误码
*/
ul set_page_attr(struct Page *page, ul flags)
{
if (page == NULL)
{
kBUG("get_page_attr(): page == NULL");
return EPAGE_NULL;
} }
else else
{ {
// 将bmp复位 page->attr = flags;
*(memory_management_struct.bmp + ((p->addr_phys >> PAGE_2M_SHIFT) >> 6)) &= ~(1UL << ((p->addr_phys >> PAGE_2M_SHIFT) % 64)); return 0;
p->attr = 0;
p->ref_counts = 0;
--p->zone->count_pages_using;
++p->zone->count_pages_free;
--p->zone->total_pages_link;
} }
} }
/** /**
* @brief 释放连续number个内存页 * @brief 释放连续number个内存页
* *
* @param page 第一个要被释放的页面的结构体 * @param page 第一个要被释放的页面的结构体
* @param number 要释放的内存页数量 number<64 * @param number 要释放的内存页数量 number<64
*/ */
void free_pages(struct Page *page, int number) void free_pages(struct Page *page, int number)
{ {
// @todo: 释放连续number个内存页 if (page == NULL)
{
kerror("free_pages() page is invalid.");
return;
}
if (number >= 64 || number <= 0)
{
kerror("free_pages(): number %d is invalid.", number);
return;
}
ul page_num;
for (int i = 0; i < number; ++i, ++page)
{
page_num = page->addr_phys >> PAGE_2M_SHIFT;
// 复位bmp
*(memory_management_struct.bmp + (page_num >> 6)) &= ~(1UL << (page_num % 64));
// 更新计数器
--page->zone->count_pages_using;
++page->zone->count_pages_free;
page->attr = 0;
}
return;
} }

69
kernel/mm/mm.h
View File

@ -43,26 +43,26 @@
#define ZONE_UNMAPPED_IN_PGT (1 << 2) #define ZONE_UNMAPPED_IN_PGT (1 << 2)
// ===== 页面属性 ===== // ===== 页面属性 =====
// 页面在页表中已被映射 // 页面在页表中已被映射 mapped=1 unmapped=0
#define PAGE_PGT_MAPPED (1 << 0) #define PAGE_PGT_MAPPED (1 << 0)
// 内核初始化程序的页
// 内核初始化程序的页 init-code=1 normal-code/data=0
#define PAGE_KERNEL_INIT (1 << 1) #define PAGE_KERNEL_INIT (1 << 1)
// 引用的页
#define PAGE_REFERENCED (1 << 2) // 1=设备寄存器映射的内存 0=物理内存
// 脏页 #define PAGE_DEVICE (1 << 2)
#define PAGE_DIRTY (1 << 3)
// 使用中的页 // 内核层页 kernel=1 memory=0
#define PAGE_ACTIVE (1 << 4) #define PAGE_KERNEL (1 << 3)
// 过时的页
#define PAGE_UP_TO_DATE (1 << 5) // 共享的页 shared=1 single-use=0
// 设备对应的页 #define PAGE_SHARED (1<<4)
#define PAGE_DEVICE (1 << 6)
// 内核层页
#define PAGE_KERNEL (1 << 7)
// 内核共享给用户态程序的页面 // ===== 错误码定义 ====
#define PAGE_K_SHARE_TO_U (1 << 8) // 物理页结构体为空
// slab内存分配器的页 #define EPAGE_NULL 1
#define PAGE_SLAB (1 << 9)
/** /**
* @brief 刷新TLB的宏定义 * @brief 刷新TLB的宏定义
@ -169,7 +169,7 @@ extern char _end;
int ZONE_DMA_INDEX = 0; int ZONE_DMA_INDEX = 0;
int ZONE_NORMAL_INDEX = 0; // low 1GB RAM ,was mapped in pagetable int ZONE_NORMAL_INDEX = 0; // low 1GB RAM ,was mapped in pagetable
int ZONE_UNMAPED_INDEX = 0; // above 1GB RAM,unmapped in pagetable int ZONE_UNMAPPED_INDEX = 0; // above 1GB RAM,unmapped in pagetable
ul *global_CR3 = NULL; ul *global_CR3 = NULL;
@ -181,8 +181,8 @@ void mm_init();
* *
* @param page 内存页结构体 * @param page 内存页结构体
* @param flags 标志位 * @param flags 标志位
* 对于新页面： 初始化struct page * 本函数只负责初始化内存页，允许对同一页面进行多次初始化
* 对于当前页面属性/flags中含有引用属性或共享属性时，则只增加struct page和struct zone的被引用计数。否则就只是添加页表属性，并置位bmp的相应位。 * 而维护计数器及置位bmp标志位的功能，应当在分配页面的时候手动完成
* @return unsigned long * @return unsigned long
*/ */
unsigned long page_init(struct Page *page, ul flags); unsigned long page_init(struct Page *page, ul flags);
@ -205,17 +205,17 @@ unsigned long *get_CR3()
* @brief 从已初始化的页结构中搜索符合申请条件的、连续num个struct page * @brief 从已初始化的页结构中搜索符合申请条件的、连续num个struct page
* *
* @param zone_select 选择内存区域, 可选项：dma, mapped in pgt(normal), unmapped in pgt * @param zone_select 选择内存区域, 可选项：dma, mapped in pgt(normal), unmapped in pgt
* @param num 需要申请的内存页的数量 num<=64 * @param num 需要申请的内存页的数量 num<64
* @param flags 将页面属性设置成flag * @param flags 将页面属性设置成flag
* @return struct Page* * @return struct Page*
*/ */
struct Page *alloc_pages(unsigned int zone_select, int num, ul flags); struct Page *alloc_pages(unsigned int zone_select, int num, ul flags);
/** /**
* @brief 释放内存页 * @brief 清除页面的引用计数， 计数为0时清空除页表已映射以外的所有属性
* *
* @param page 内存页结构体 * @param p 物理页结构体
* @return unsigned long * @return unsigned long
*/ */
unsigned long page_clean(struct Page *page); unsigned long page_clean(struct Page *page);
@ -227,6 +227,23 @@ unsigned long page_clean(struct Page *page);
*/ */
void free_pages(struct Page *page, int number); void free_pages(struct Page *page, int number);
/**
* @brief Get the page's attr
*
* @param page 内存页结构体
* @return ul 属性
*/
ul get_page_attr(struct Page* page);
/**
* @brief Set the page's attr
*
* @param page 内存页结构体
* @param flags 属性
* @return ul 错误码
*/
ul set_page_attr(struct Page* page, ul flags);
/** /**
* @brief 内存页表结构体 * @brief 内存页表结构体
* *

2
kernel/process/process.c
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@ -233,7 +233,7 @@ unsigned long do_fork(struct pt_regs *regs, unsigned long clone_flags, unsigned
struct process_control_block *tsk = NULL; struct process_control_block *tsk = NULL;
// 获取一个物理页并在这个物理页内初始化pcb // 获取一个物理页并在这个物理页内初始化pcb
struct Page *pp = alloc_pages(ZONE_NORMAL, 1, PAGE_PGT_MAPPED | PAGE_ACTIVE | PAGE_KERNEL); struct Page *pp = alloc_pages(ZONE_NORMAL, 1, PAGE_PGT_MAPPED | PAGE_KERNEL);
tsk = (struct process_control_block *)phys_2_virt(pp->addr_phys); tsk = (struct process_control_block *)phys_2_virt(pp->addr_phys);