mirror of
https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-08 22:36:48 +00:00
20 lines
580 B
C
20 lines
580 B
C
#pragma once
|
||
#include <common/glib.h>
|
||
|
||
#pragma GCC push_options
|
||
#pragma GCC optimize("O0")
|
||
struct process_control_block;
|
||
// 获取当前的pcb
|
||
static __always_inline struct process_control_block *get_current_pcb()
|
||
{
|
||
struct process_control_block *current = NULL;
|
||
// 利用了当前pcb和栈空间总大小为32k大小对齐，将rsp低15位清空，即可获得pcb的起始地址
|
||
barrier();
|
||
__asm__ __volatile__("andq %%rsp, %0 \n\t"
|
||
: "=r"(current)
|
||
: "0"(~32767UL));
|
||
barrier();
|
||
return current;
|
||
};
|
||
#define current_pcb get_current_pcb()
|
||
#pragma GCC pop_options |