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doc: 内存管理api

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fslongjin
2022-07-27 00:09:19 +08:00
parent 5c9e03236d
commit 1b4f812fe4
6 changed files with 231 additions and 11 deletions
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2
kernel/mm/mm.c
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@ -372,8 +372,6 @@ struct Page *alloc_pages(unsigned int zone_select, int num, ul flags)
}
}
kBUG("Cannot alloc page, ZONE=%d\tnums=%d, total_2M_pages=%d", zone_select, num, total_2M_pages);
while (1)
;
return NULL;
}

4
kernel/mm/mm.h
View File

@ -58,10 +58,10 @@
// 页面在页表中已被映射 mapped=1 unmapped=0
#define PAGE_PGT_MAPPED (1 << 0)
// 内核初始化程序的页 init-code=1 normal-code/data=0
// 内核初始化所占用的页 init-code=1 normal-code/data=0
#define PAGE_KERNEL_INIT (1 << 1)
// 1=设备寄存器映射的内存 0=物理内存
// 1=设备MMIO映射的内存 0=物理内存
#define PAGE_DEVICE (1 << 2)
// 内核层页 kernel=1 memory=0

11
kernel/mm/slab.c
View File

@ -1,6 +1,5 @@
#include "slab.h"
#include <common/compiler.h>
struct slab kmalloc_cache_group[16] =
{
@ -396,7 +395,7 @@ ul slab_init()
page_init(page, PAGE_KERNEL_INIT | PAGE_KERNEL | PAGE_PGT_MAPPED);
}
//kdebug("2.memory_management_struct.bmp:%#018lx\tzone_struct->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);
// kdebug("2.memory_management_struct.bmp:%#018lx\tzone_struct->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);
// 为slab内存池对象分配内存空间
ul *virt = NULL;
@ -417,7 +416,7 @@ ul slab_init()
kmalloc_cache_group[i].cache_pool_entry->vaddr = virt;
}
//kdebug("3.memory_management_struct.bmp:%#018lx\tzone_struct->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);
// kdebug("3.memory_management_struct.bmp:%#018lx\tzone_struct->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("SLAB initialized successfully!");
@ -550,7 +549,7 @@ void *kmalloc(unsigned long size, unsigned long flags)
struct slab_obj *slab_obj_ptr = kmalloc_cache_group[index].cache_pool_entry;
//kdebug("count_total_free=%d", kmalloc_cache_group[index].count_total_free);
// kdebug("count_total_free=%d", kmalloc_cache_group[index].count_total_free);
// 内存池没有可用的内存对象，需要进行扩容
if (kmalloc_cache_group[index].count_total_free == 0)
@ -617,6 +616,8 @@ void *kmalloc(unsigned long size, unsigned long flags)
*/
unsigned long kfree(void *address)
{
if (unlikely(address == NULL))
return 0;
struct slab_obj *slab_obj_ptr = NULL;
// 将线性地址按照2M物理页对齐, 获得所在物理页的起始线性地址