sys_ppc.s

来自「abstract rtos」· S 代码 · 共 54 行

#define _ASMLANGUAGE
#include <vxWorks.h>
#include <asm.h>
#include <regs.h>    

    .file "sys_ppc.s"
    .text

    .align  2
    .globl sys_get_cur_sp
sys_get_cur_sp:
    mr         r3,r1
    blr
    


    .align 2
    .globl ppc_get_time
ppc_get_time:

loop:
    mftbu      r7   #load from TBU
    mftb       r5   #load from TBL
    mftbu      r6   #load from TBU
    cmpw       r7,r6 
    bne        loop #loop if carry occurred
    stw        r5,0(r3)
    stw        r7,0(r4)
    blr

    .type ppc_get_time,@function
    .size ppc_get_time,.-ppc_get_time

    .align 2
    .globl atom_fetch_and_store
atom_fetch_and_store:
loop_2:
    lwarx  r5,0,r3   #load and reserve
    stwcx. r4,0,r3   #store new value
    bne-    loop_2
    mr     r3,r5
    blr

    .type atom_fetch_and_store,@function
    .size atom_fetch_and_store,.-atom_fetch_and_store