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🆕 内核堆内存调整函数

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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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27
kernel/syscall/syscall.c
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@ -344,6 +344,33 @@ uint64_t sys_vfork(struct pt_regs *regs)
return do_fork(regs, CLONE_VM | CLONE_FS | CLONE_SIGNAL, regs->rsp, 0);
}
/**
* @brief 堆内存调整
*
* @param arg0 新的堆区域的结束地址
* @return uint64_t 调整后的堆区域的结束地址
*/
uint64_t sys_brk(struct pt_regs *regs)
{
uint64_t new_brk = PAGE_2M_ALIGN(regs->r8);
kdebug("sys_brk input= %#010lx bytes, new_brk= %#010lx bytes current->end_brk=%#018lx", regs->r8, new_brk, current_pcb->mm->brk_end);
if (new_brk == 0)
return current_pcb->mm->brk_start;
if(new_brk > current_pcb->addr_limit) // 堆地址空间超过限制
return -EADDRNOTAVAIL;
if (new_brk < current_pcb->mm->brk_end) // todo: 释放堆内存空间
return 0;
new_brk = mm_do_brk(current_pcb->mm->brk_end, new_brk - current_pcb->mm->brk_end); // 扩展堆内存空间
current_pcb->mm->brk_end = new_brk;
return new_brk;
}
ul sys_ahci_end_req(struct pt_regs *regs)
{
ahci_end_request();