diff options
Diffstat (limited to 'arch/sparc/lib/locks.S')
| -rw-r--r-- | arch/sparc/lib/locks.S | 44 |
1 files changed, 21 insertions, 23 deletions
diff --git a/arch/sparc/lib/locks.S b/arch/sparc/lib/locks.S index 8d634704f..102541b18 100644 --- a/arch/sparc/lib/locks.S +++ b/arch/sparc/lib/locks.S @@ -1,7 +1,9 @@ -/* $Id: locks.S,v 1.13 1998/07/30 11:29:28 davem Exp $ +/* $Id: locks.S,v 1.15 1998/10/14 09:18:55 jj 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/cprefix.h> @@ -43,52 +45,48 @@ ___rw_read_enter_spin_on_wlock: 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 - ldub [%g1 + 3], %g2 + 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 -1: - ldstub [%g1 + 2], %g7 - orcc %g7, 0x0, %g0 - bne 1b - ldsh [%g1], %g2 + ld [%g1], %g2 add %g2, 1, %g2 - sth %g2, [%g1] - sth %g0, [%g1 + 2] + st %g2, [%g1] retl mov %g4, %o7 - /* We must be careful here to not blow away wlock. */ .globl ___rw_read_exit -___rw_read_exit_spin: - ldstub [%g1 + 2], %g2 ___rw_read_exit: orcc %g2, 0x0, %g0 - bne ___rw_read_exit_spin - ldsh [%g1], %g7 - sub %g7, 1, %g7 - sth %g7, [%g1] - stb %g0, [%g1 + 2] + 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,a ___rw_write_enter_spin_on_wlock - ldub [%g1 + 3], %g2 - ld [%g1], %g2 -1: - andncc %g2, 0xff, %g0 - bne,a 1b + 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 |