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authorDan Williams <dan.j.williams@intel.com>2007-02-16 22:16:32 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-02-17 15:04:29 +0000
commitf80dff9da07d81da16e3b842118d47b9febf9c01 (patch)
treeea2da17c5af516c241b3ea3b4dd4fa47d9d86769 /arch/arm
parent588ef7693574cfbcb228f48d5478c2b39a9b0c9f (diff)
[ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user
get_irqnr_preamble allows machines to take some action before entering the get_irqnr_and_base loop. On iop we enable cp6 access. arch_ret_to_user is added to the userspace return path to allow individual architectures to take actions, like disabling coprocessor access, before the final return to userspace. Per Nicolas Pitre's note, there is no need to cp_wait on the return to user as the latency to return is sufficient. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/kernel/entry-armv.S1
-rw-r--r--arch/arm/kernel/entry-common.S7
2 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index cc10a093a54..d645897652c 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -27,6 +27,7 @@
* Interrupt handling. Preserves r7, r8, r9
*/
.macro irq_handler
+ get_irqnr_preamble r5, lr
1: get_irqnr_and_base r0, r6, r5, lr
movne r1, sp
@
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 6f5e7c50d42..c589dc3ecd1 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -9,6 +9,7 @@
*/
#include <asm/unistd.h>
+#include <asm/arch/entry-macro.S>
#include "entry-header.S"
@@ -25,6 +26,9 @@ ret_fast_syscall:
tst r1, #_TIF_WORK_MASK
bne fast_work_pending
+ /* perform architecture specific actions before user return */
+ arch_ret_to_user r1, lr
+
@ fast_restore_user_regs
ldr r1, [sp, #S_OFF + S_PSR] @ get calling cpsr
ldr lr, [sp, #S_OFF + S_PC]! @ get pc
@@ -61,6 +65,9 @@ ret_slow_syscall:
tst r1, #_TIF_WORK_MASK
bne work_pending
no_work_pending:
+ /* perform architecture specific actions before user return */
+ arch_ret_to_user r1, lr
+
@ slow_restore_user_regs
ldr r1, [sp, #S_PSR] @ get calling cpsr
ldr lr, [sp, #S_PC]! @ get pc