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authorDan Williams <dan.j.williams@intel.com>2007-02-16 16:16:32 -0500
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-02-17 10:04:29 -0500
commitf80dff9da07d81da16e3b842118d47b9febf9c01 (patch)
treeea2da17c5af516c241b3ea3b4dd4fa47d9d86769 /arch/arm/kernel/entry-common.S
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/kernel/entry-common.S')
-rw-r--r--arch/arm/kernel/entry-common.S7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 6f5e7c50d42f..c589dc3ecd1a 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -9,6 +9,7 @@
9 */ 9 */
10 10
11#include <asm/unistd.h> 11#include <asm/unistd.h>
12#include <asm/arch/entry-macro.S>
12 13
13#include "entry-header.S" 14#include "entry-header.S"
14 15
@@ -25,6 +26,9 @@ ret_fast_syscall:
25 tst r1, #_TIF_WORK_MASK 26 tst r1, #_TIF_WORK_MASK
26 bne fast_work_pending 27 bne fast_work_pending
27 28
29 /* perform architecture specific actions before user return */
30 arch_ret_to_user r1, lr
31
28 @ fast_restore_user_regs 32 @ fast_restore_user_regs
29 ldr r1, [sp, #S_OFF + S_PSR] @ get calling cpsr 33 ldr r1, [sp, #S_OFF + S_PSR] @ get calling cpsr
30 ldr lr, [sp, #S_OFF + S_PC]! @ get pc 34 ldr lr, [sp, #S_OFF + S_PC]! @ get pc
@@ -61,6 +65,9 @@ ret_slow_syscall:
61 tst r1, #_TIF_WORK_MASK 65 tst r1, #_TIF_WORK_MASK
62 bne work_pending 66 bne work_pending
63no_work_pending: 67no_work_pending:
68 /* perform architecture specific actions before user return */
69 arch_ret_to_user r1, lr
70
64 @ slow_restore_user_regs 71 @ slow_restore_user_regs
65 ldr r1, [sp, #S_PSR] @ get calling cpsr 72 ldr r1, [sp, #S_PSR] @ get calling cpsr
66 ldr lr, [sp, #S_PC]! @ get pc 73 ldr lr, [sp, #S_PC]! @ get pc