mirror of https://gitee.com/openkylin/linux.git
73 lines
1.6 KiB
ArmAsm
73 lines
1.6 KiB
ArmAsm
/* $Id: locks.S,v 1.16 2000/02/26 11:02:47 anton Exp $
|
|
* locks.S: SMP low-level lock primitives on Sparc.
|
|
*
|
|
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
|
|
* Copyright (C) 1998 Anton Blanchard (anton@progsoc.uts.edu.au)
|
|
* Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
|
|
*/
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <asm/psr.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/spinlock.h>
|
|
|
|
.text
|
|
.align 4
|
|
|
|
/* Read/writer locks, as usual this is overly clever to make it
|
|
* as fast as possible.
|
|
*/
|
|
|
|
/* caches... */
|
|
___rw_read_enter_spin_on_wlock:
|
|
orcc %g2, 0x0, %g0
|
|
be,a ___rw_read_enter
|
|
ldstub [%g1 + 3], %g2
|
|
b ___rw_read_enter_spin_on_wlock
|
|
ldub [%g1 + 3], %g2
|
|
___rw_read_exit_spin_on_wlock:
|
|
orcc %g2, 0x0, %g0
|
|
be,a ___rw_read_exit
|
|
ldstub [%g1 + 3], %g2
|
|
b ___rw_read_exit_spin_on_wlock
|
|
ldub [%g1 + 3], %g2
|
|
___rw_write_enter_spin_on_wlock:
|
|
orcc %g2, 0x0, %g0
|
|
be,a ___rw_write_enter
|
|
ldstub [%g1 + 3], %g2
|
|
b ___rw_write_enter_spin_on_wlock
|
|
ld [%g1], %g2
|
|
|
|
.globl ___rw_read_enter
|
|
___rw_read_enter:
|
|
orcc %g2, 0x0, %g0
|
|
bne,a ___rw_read_enter_spin_on_wlock
|
|
ldub [%g1 + 3], %g2
|
|
ld [%g1], %g2
|
|
add %g2, 1, %g2
|
|
st %g2, [%g1]
|
|
retl
|
|
mov %g4, %o7
|
|
|
|
.globl ___rw_read_exit
|
|
___rw_read_exit:
|
|
orcc %g2, 0x0, %g0
|
|
bne,a ___rw_read_exit_spin_on_wlock
|
|
ldub [%g1 + 3], %g2
|
|
ld [%g1], %g2
|
|
sub %g2, 0x1ff, %g2
|
|
st %g2, [%g1]
|
|
retl
|
|
mov %g4, %o7
|
|
|
|
.globl ___rw_write_enter
|
|
___rw_write_enter:
|
|
orcc %g2, 0x0, %g0
|
|
bne ___rw_write_enter_spin_on_wlock
|
|
ld [%g1], %g2
|
|
andncc %g2, 0xff, %g0
|
|
bne,a ___rw_write_enter_spin_on_wlock
|
|
stb %g0, [%g1 + 3]
|
|
retl
|
|
mov %g4, %o7
|