threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
63 lines
1.7 KiB
ArmAsm
63 lines
1.7 KiB
ArmAsm
/* atomic-ops.S: kernel atomic operations
|
|
*
|
|
* For an explanation of how atomic ops work in this arch, see:
|
|
* Documentation/frv/atomic-ops.txt
|
|
*
|
|
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <asm/spr-regs.h>
|
|
|
|
.text
|
|
.balign 4
|
|
|
|
###############################################################################
|
|
#
|
|
# uint32_t __xchg_32(uint32_t i, uint32_t *v)
|
|
#
|
|
###############################################################################
|
|
.globl __xchg_32
|
|
.type __xchg_32,@function
|
|
__xchg_32:
|
|
or.p gr8,gr8,gr10
|
|
0:
|
|
orcc gr0,gr0,gr0,icc3 /* set ICC3.Z */
|
|
ckeq icc3,cc7
|
|
ld.p @(gr9,gr0),gr8 /* LD.P/ORCR must be atomic */
|
|
orcr cc7,cc7,cc3 /* set CC3 to true */
|
|
cst.p gr10,@(gr9,gr0) ,cc3,#1
|
|
corcc gr29,gr29,gr0 ,cc3,#1 /* clear ICC3.Z if store happens */
|
|
beq icc3,#0,0b
|
|
bralr
|
|
|
|
.size __xchg_32, .-__xchg_32
|
|
|
|
###############################################################################
|
|
#
|
|
# uint32_t __cmpxchg_32(uint32_t *v, uint32_t test, uint32_t new)
|
|
#
|
|
###############################################################################
|
|
.globl __cmpxchg_32
|
|
.type __cmpxchg_32,@function
|
|
__cmpxchg_32:
|
|
or.p gr8,gr8,gr11
|
|
0:
|
|
orcc gr0,gr0,gr0,icc3
|
|
ckeq icc3,cc7
|
|
ld.p @(gr11,gr0),gr8
|
|
orcr cc7,cc7,cc3
|
|
subcc gr8,gr9,gr7,icc0
|
|
bnelr icc0,#0
|
|
cst.p gr10,@(gr11,gr0) ,cc3,#1
|
|
corcc gr29,gr29,gr0 ,cc3,#1
|
|
beq icc3,#0,0b
|
|
bralr
|
|
|
|
.size __cmpxchg_32, .-__cmpxchg_32
|