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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-01-17 15:35:37 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-02-02 21:23:28 +0000
commit7db44c75a241c18d03e82540c5b825216d4c668b (patch)
treeed60c9c5b8f894742ff5cfee278e542f5d8818b6 /arch/arm/kernel/entry-header.S
parentc786282e6dd18fe2ff43ab44411085dc40e7fbc5 (diff)
downloadop-kernel-dev-7db44c75a241c18d03e82540c5b825216d4c668b.zip
op-kernel-dev-7db44c75a241c18d03e82540c5b825216d4c668b.tar.gz
ARM: v6k: select clear exclusive code seqences according to V6 variants
If CONFIG_CPU_V6 is enabled, then the kernel must support ARMv6 CPUs which don't have the V6K extensions implemented. Always use the dummy store-exclusive method to ensure that the exclusive monitors are cleared. If CONFIG_CPU_V6 is not set, but CONFIG_CPU_32v6K is enabled, then we have the K extensions available on all CPUs we're building support for, so we can use the new clear-exclusive instruction. Acked-by: Tony Lindgren <tony@atomide.com> Tested-by: Sourav Poddar <sourav.poddar@ti.com> Tested-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/entry-header.S')
-rw-r--r--arch/arm/kernel/entry-header.S14
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S
index ae94649..051166c 100644
--- a/arch/arm/kernel/entry-header.S
+++ b/arch/arm/kernel/entry-header.S
@@ -76,13 +76,13 @@
#ifndef CONFIG_THUMB2_KERNEL
.macro svc_exit, rpsr
msr spsr_cxsf, \rpsr
-#if defined(CONFIG_CPU_32v6K)
- clrex @ clear the exclusive monitor
- ldmia sp, {r0 - pc}^ @ load r0 - pc, cpsr
-#elif defined (CONFIG_CPU_V6)
+#if defined(CONFIG_CPU_V6)
ldr r0, [sp]
strex r1, r2, [sp] @ clear the exclusive monitor
ldmib sp, {r1 - pc}^ @ load r1 - pc, cpsr
+#elif defined(CONFIG_CPU_32v6K)
+ clrex @ clear the exclusive monitor
+ ldmia sp, {r0 - pc}^ @ load r0 - pc, cpsr
#else
ldmia sp, {r0 - pc}^ @ load r0 - pc, cpsr
#endif
@@ -92,10 +92,10 @@
ldr r1, [sp, #\offset + S_PSR] @ get calling cpsr
ldr lr, [sp, #\offset + S_PC]! @ get pc
msr spsr_cxsf, r1 @ save in spsr_svc
-#if defined(CONFIG_CPU_32v6K)
- clrex @ clear the exclusive monitor
-#elif defined (CONFIG_CPU_V6)
+#if defined(CONFIG_CPU_V6)
strex r1, r2, [sp] @ clear the exclusive monitor
+#elif defined(CONFIG_CPU_32v6K)
+ clrex @ clear the exclusive monitor
#endif
.if \fast
ldmdb sp, {r1 - lr}^ @ get calling r1 - lr
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