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🆕 内核堆内存调整函数

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This commit is contained in:
fslongjin
2022-05-06 15:29:42 +08:00
parent b7437b24d7
commit 78a219b715
5 changed files with 72 additions and 9 deletions
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28
kernel/mm/mm.c
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@ -3,6 +3,7 @@
#include "../common/printk.h"
#include "../common/kprint.h"
#include "../driver/multiboot2/multiboot2.h"
#include <process/process.h>
ul Total_Memory = 0;
ul total_2M_pages = 0;
@ -14,7 +15,8 @@ void mm_init()
memory_management_struct.kernel_code_start = (ul)&_text;
memory_management_struct.kernel_code_end = (ul)&_etext;
memory_management_struct.kernel_data_end = (ul)&_edata;
memory_management_struct.kernel_end = (ul)&_end;
memory_management_struct.rodata_end = (ul)&_erodata;
memory_management_struct.start_brk = (ul)&_end;
struct multiboot_mmap_entry_t mb2_mem_info[512];
int count;
@ -63,7 +65,7 @@ void mm_init()
ul max_addr = memory_management_struct.e820[memory_management_struct.len_e820].BaseAddr + memory_management_struct.e820[memory_management_struct.len_e820].Length;
// 初始化mms的bitmap
// bmp的指针指向截止位置的4k对齐的上边界（防止修改了别的数据）
memory_management_struct.bmp = (unsigned long *)((memory_management_struct.kernel_end + PAGE_4K_SIZE - 1) & PAGE_4K_MASK);
memory_management_struct.bmp = (unsigned long *)((memory_management_struct.start_brk + PAGE_4K_SIZE - 1) & PAGE_4K_MASK);
memory_management_struct.bits_size = max_addr >> PAGE_2M_SHIFT; // 物理地址空间的最大页面数
memory_management_struct.bmp_len = (((unsigned long)(max_addr >> PAGE_2M_SHIFT) + sizeof(unsigned long) * 8 - 1) / 8) & (~(sizeof(unsigned long) - 1)); // bmp由多少个unsigned long变量组成
@ -665,4 +667,26 @@ void mm_map_proc_page_table(ul proc_page_table_addr, bool is_phys, ul virt_addr_
}
flush_tlb();
}
/**
* @brief 调整堆区域的大小（暂时只能增加堆区域）
*
* @todo 缩小堆区域
* @param old_brk_end_addr 原本的堆内存区域的结束地址
* @param offset 新的地址相对于原地址的偏移量
* @return uint64_t
*/
uint64_t mm_do_brk(uint64_t old_brk_end_addr, int64_t offset)
{
// 暂不支持缩小堆内存
if(offset <0)
return old_brk_end_addr;
uint64_t end_addr = old_brk_end_addr + offset;
for (uint64_t i = old_brk_end_addr; i < end_addr; i += PAGE_2M_SIZE)
mm_map_proc_page_table(current_pcb->mm->pgd, true, i, alloc_pages(ZONE_NORMAL, 1, PAGE_PGT_MAPPED), PAGE_2M_SIZE, PAGE_USER_PAGE, true);
current_pcb->mm->brk_end = end_addr;
return end_addr;
}