swh:1:snp:77163734605b0ec556b01d897b7bb4a7e30d46b6
Tip revision: 979570e02981d4a8fc20b3cc8fd651856c98ee9d authored by Linus Torvalds on 24 September 2012, 01:10:57 UTC
Linux 3.6-rc7
Linux 3.6-rc7
Tip revision: 979570e
locks.S
/*
* 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_try_spin_on_wlock:
andcc %g2, 0xff, %g0
be,a ___rw_read_try
ldstub [%g1 + 3], %g2
xnorcc %g2, 0x0, %o0 /* if g2 is ~0, set o0 to 0 and bugger off */
bne,a ___rw_read_enter_spin_on_wlock
ld [%g1], %g2
retl
mov %g4, %o7
___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_read_try
___rw_read_try:
orcc %g2, 0x0, %g0
bne ___rw_read_try_spin_on_wlock
ld [%g1], %g2
add %g2, 1, %g2
st %g2, [%g1]
set 1, %o1
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