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080c3747
编写于
2月 11, 2013
作者:
V
Vineet Gupta
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
ARC: [optim] Cache "current" in Register r25
Signed-off-by:
N
Vineet Gupta
<
vgupta@synopsys.com
>
上级
8872e9e5
变更
9
隐藏空白更改
内联
并排
Showing
9 changed file
with
120 addition
and
1 deletion
+120
-1
arch/arc/Kconfig
arch/arc/Kconfig
+7
-0
arch/arc/Makefile
arch/arc/Makefile
+9
-0
arch/arc/include/asm/Kbuild
arch/arc/include/asm/Kbuild
+0
-1
arch/arc/include/asm/current.h
arch/arc/include/asm/current.h
+32
-0
arch/arc/include/asm/entry.h
arch/arc/include/asm/entry.h
+45
-0
arch/arc/include/asm/processor.h
arch/arc/include/asm/processor.h
+3
-0
arch/arc/kernel/asm-offsets.c
arch/arc/kernel/asm-offsets.c
+3
-0
arch/arc/kernel/ctx_sw.c
arch/arc/kernel/ctx_sw.c
+7
-0
arch/arc/kernel/entry.S
arch/arc/kernel/entry.S
+14
-0
未找到文件。
arch/arc/Kconfig
浏览文件 @
080c3747
...
...
@@ -264,6 +264,13 @@ config LINUX_LINK_BASE
endmenu # "Platform Board Configuration"
config ARC_CURR_IN_REG
bool "Dedicate Register r25 for current_task pointer"
default y
help
This reserved Register R25 to point to Current Task in
kernel mode. This saves memory access for each such access
config ARC_STACK_NONEXEC
bool "Make stack non-executable"
default n
...
...
arch/arc/Makefile
浏览文件 @
080c3747
...
...
@@ -20,6 +20,15 @@ export PLATFORM
cflags-y
+=
-Iarch
/arc/plat-
$(PLATFORM)
/include
cflags-y
+=
-mA7
-fno-common
-pipe
-fno-builtin
-D__linux__
ifdef
CONFIG_ARC_CURR_IN_REG
# For a global register defintion, make sure it gets passed to every file
# We had a customer reported bug where some code built in kernel was NOT using
# any kernel headers, and missing the r25 global register
# Can't do unconditionally (like above) because of recursive include issues
# due to <linux/thread_info.h>
LINUXINCLUDE
+=
-include
${src}
/arch/arc/include/asm/current.h
endif
atleast_gcc44
:=
$(
call
cc-ifversion,
-gt
, 0402, y
)
cflags-$(atleast_gcc44)
+=
-fsection-anchors
...
...
arch/arc/include/asm/Kbuild
浏览文件 @
080c3747
...
...
@@ -11,7 +11,6 @@ generic-y += bugs.h
generic-y += bitsperlong.h
generic-y += clkdev.h
generic-y += cputime.h
generic-y += current.h
generic-y += device.h
generic-y += div64.h
generic-y += emergency-restart.h
...
...
arch/arc/include/asm/current.h
0 → 100644
浏览文件 @
080c3747
/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Vineetg: May 16th, 2008
* - Current macro is now implemented as "global register" r25
*/
#ifndef _ASM_ARC_CURRENT_H
#define _ASM_ARC_CURRENT_H
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#ifdef CONFIG_ARC_CURR_IN_REG
register
struct
task_struct
*
curr_arc
asm
(
"r25"
);
#define current (curr_arc)
#else
#include <asm-generic/current.h>
#endif
/* ! CONFIG_ARC_CURR_IN_REG */
#endif
/* ! __ASSEMBLY__ */
#endif
/* __KERNEL__ */
#endif
/* _ASM_ARC_CURRENT_H */
arch/arc/include/asm/entry.h
浏览文件 @
080c3747
...
...
@@ -13,6 +13,8 @@
* was being "CLEARED" rather then "SET". Actually "SET" clears ZOL context
*
* Vineetg: May 5th 2008
* -Modified CALLEE_REG save/restore macros to handle the fact that
* r25 contains the kernel current task ptr
* - Defined Stack Switching Macro to be reused in all intr/excp hdlrs
* - Shaved off 11 instructions from RESTORE_ALL_INT1 by using the
* address Write back load ld.ab instead of seperate ld/add instn
...
...
@@ -28,6 +30,7 @@
#include <asm/asm-offsets.h>
#include <asm/arcregs.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
/* For VMALLOC_START */
#include <asm/thread_info.h>
/* For THREAD_SIZE */
/* Note on the LD/ST addr modes with addr reg wback
...
...
@@ -106,7 +109,14 @@
st
.
a
r22
,
[
sp
,
-
4
]
st
.
a
r23
,
[
sp
,
-
4
]
st
.
a
r24
,
[
sp
,
-
4
]
#ifdef CONFIG_ARC_CURR_IN_REG
;
Retrieve
orig
r25
and
save
it
on
stack
ld
r12
,
[
r25
,
TASK_THREAD
+
THREAD_USER_R25
]
st
.
a
r12
,
[
sp
,
-
4
]
#else
st
.
a
r25
,
[
sp
,
-
4
]
#endif
/* move up by 1 word to "create" callee_regs->"stack_place_holder" */
sub
sp
,
sp
,
4
...
...
@@ -131,8 +141,12 @@
st
.
a
r22
,
[
sp
,
-
4
]
st
.
a
r23
,
[
sp
,
-
4
]
st
.
a
r24
,
[
sp
,
-
4
]
#ifdef CONFIG_ARC_CURR_IN_REG
sub
sp
,
sp
,
8
#else
st
.
a
r25
,
[
sp
,
-
4
]
sub
sp
,
sp
,
4
#endif
.
endm
/*--------------------------------------------------------------
...
...
@@ -148,8 +162,14 @@
*-------------------------------------------------------------*/
.
macro
RESTORE_CALLEE_SAVED_KERNEL
#ifdef CONFIG_ARC_CURR_IN_REG
add
sp
,
sp
,
8
/* skip callee_reg gutter and user r25 placeholder */
#else
add
sp
,
sp
,
4
/* skip "callee_regs->stack_place_holder" */
ld
.
ab
r25
,
[
sp
,
4
]
#endif
ld
.
ab
r24
,
[
sp
,
4
]
ld
.
ab
r23
,
[
sp
,
4
]
ld
.
ab
r22
,
[
sp
,
4
]
...
...
@@ -235,6 +255,7 @@
*
* Entry : r9 contains pre-IRQ/exception/trap status32
* Exit : SP is set to kernel mode stack pointer
* If CURR_IN_REG, r25 set to "current" task pointer
* Clobbers: r9
*-------------------------------------------------------------*/
...
...
@@ -259,6 +280,16 @@
GET_CURR_TASK_ON_CPU
r9
#ifdef CONFIG_ARC_CURR_IN_REG
/* If current task pointer cached in r25, time to
* -safekeep USER r25 in task->thread_struct->user_r25
* -load r25 with current task ptr
*/
st
.
as
r25
,
[
r9
,
(
TASK_THREAD
+
THREAD_USER_R25
)
/
4
]
mov
r25
,
r9
#endif
/* With current tsk in r9, get it's kernel mode stack base */
GET_TSK_STACK_BASE
r9
,
r9
...
...
@@ -519,17 +550,31 @@
.
macro
SET_CURR_TASK_ON_CPU
tsk
,
tmp
st
\
tsk
,
[
@
_current_task
]
#ifdef CONFIG_ARC_CURR_IN_REG
mov
r25
,
\
tsk
#endif
.
endm
/* ------------------------------------------------------------------
* Get the ptr to some field of Current Task at @off in task struct
* -Uses r25 for Current task ptr if that is enabled
*/
#ifdef CONFIG_ARC_CURR_IN_REG
.
macro
GET_CURR_TASK_FIELD_PTR
off
,
reg
add
\
reg
,
r25
,
\
off
.
endm
#else
.
macro
GET_CURR_TASK_FIELD_PTR
off
,
reg
GET_CURR_TASK_ON_CPU
\
reg
add
\
reg
,
\
reg
,
\
off
.
endm
#endif
/* CONFIG_ARC_CURR_IN_REG */
#endif
/* __ASSEMBLY__ */
#endif
/* __ASM_ARC_ENTRY_H */
arch/arc/include/asm/processor.h
浏览文件 @
080c3747
...
...
@@ -29,6 +29,9 @@ struct thread_struct {
unsigned
long
callee_reg
;
/* pointer to callee regs */
unsigned
long
fault_address
;
/* dbls as brkpt holder as well */
unsigned
long
cause_code
;
/* Exception Cause Code (ECR) */
#ifdef CONFIG_ARC_CURR_IN_REG
unsigned
long
user_r25
;
#endif
#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
struct
arc_fpu
fpu
;
#endif
...
...
arch/arc/kernel/asm-offsets.c
浏览文件 @
080c3747
...
...
@@ -24,6 +24,9 @@ int main(void)
DEFINE
(
THREAD_KSP
,
offsetof
(
struct
thread_struct
,
ksp
));
DEFINE
(
THREAD_CALLEE_REG
,
offsetof
(
struct
thread_struct
,
callee_reg
));
#ifdef CONFIG_ARC_CURR_IN_REG
DEFINE
(
THREAD_USER_R25
,
offsetof
(
struct
thread_struct
,
user_r25
));
#endif
DEFINE
(
THREAD_FAULT_ADDR
,
offsetof
(
struct
thread_struct
,
fault_address
));
...
...
arch/arc/kernel/ctx_sw.c
浏览文件 @
080c3747
...
...
@@ -24,6 +24,9 @@ __switch_to(struct task_struct *prev_task, struct task_struct *next_task)
unsigned
int
prev
=
(
unsigned
int
)
prev_task
;
unsigned
int
next
=
(
unsigned
int
)
next_task
;
int
num_words_to_skip
=
1
;
#ifdef CONFIG_ARC_CURR_IN_REG
num_words_to_skip
++
;
#endif
__asm__
__volatile__
(
/* FP/BLINK save generated by gcc (standard function prologue */
...
...
@@ -39,7 +42,9 @@ __switch_to(struct task_struct *prev_task, struct task_struct *next_task)
"st.a r22, [sp, -4]
\n\t
"
"st.a r23, [sp, -4]
\n\t
"
"st.a r24, [sp, -4]
\n\t
"
#ifndef CONFIG_ARC_CURR_IN_REG
"st.a r25, [sp, -4]
\n\t
"
#endif
"sub sp, sp, %4
\n\t
"
/* create gutter at top */
/* set ksp of outgoing task in tsk->thread.ksp */
...
...
@@ -62,7 +67,9 @@ __switch_to(struct task_struct *prev_task, struct task_struct *next_task)
"add sp, sp, %4
\n\t
"
/* skip gutter at top */
#ifndef CONFIG_ARC_CURR_IN_REG
"ld.ab r25, [sp, 4]
\n\t
"
#endif
"ld.ab r24, [sp, 4]
\n\t
"
"ld.ab r23, [sp, 4]
\n\t
"
"ld.ab r22, [sp, 4]
\n\t
"
...
...
arch/arc/kernel/entry.S
浏览文件 @
080c3747
...
...
@@ -32,6 +32,9 @@
*
was
being
"CLEARED"
rather
then
"SET"
.
Since
it
is
Loop
INHIBIT
Bit
,
*
setting
it
and
not
clearing
it
clears
ZOL
context
*
*
Vineetg
:
May
16
th
,
2008
*
-
r25
now
contains
the
Current
Task
when
in
kernel
*
*
Vineetg
:
Dec
22
,
2007
*
Minor
Surgery
of
Low
Level
ISR
to
make
it
SMP
safe
*
-
MMU_SCRATCH0
Reg
used
for
freeing
up
r9
in
Level
1
ISR
...
...
@@ -535,6 +538,17 @@ restore_regs :
; XXX can this be optimised out
IRQ_DISABLE_SAVE
r9
,
r10
;@r10 has prisitine (pre-disable) copy
#ifdef CONFIG_ARC_CURR_IN_REG
; Restore User R25
; Earlier this used to be only for returning to user mode
; However with 2 levels of IRQ this can also happen even if
; in kernel mode
ld
r9
,
[
sp
,
PT_sp
]
brhs
r9
,
VMALLOC_START
,
8
f
RESTORE_USER_R25
8
:
#endif
; Restore REG File. In case multiple Events outstanding,
; use the same priorty as rtie: EXCPN, L2 IRQ, L1 IRQ, None
; Note that we use realtime STATUS32 (not pt_regs->status32) to
...
...
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