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authorRich Felker <dalias@libc.org>2016-02-15 18:32:31 +0000
committerRich Felker <dalias@libc.org>2016-06-08 00:35:57 +0000
commit6209cbba382159be3ba014edaa681afad95c1b1c (patch)
tree561bfc37faed20f8b46bf3f87a5889436770daf5
parent3ce5077d6e6d553649c0a38fc83c043c7b1d5beb (diff)
downloadlinux-sh-6209cbba382159be3ba014edaa681afad95c1b1c.tar.gz
sh: SMP support for SH2 entry.S
The SH2 version of entry.S uses global variables, which need to be cpu-local in order to work with SMP. For ease of access from asm, simply use arrays indexed by cpu number, and require the availability of an address (mmio register or properly setup per-cpu memory) from which the current cpu's index can be read. Signed-off-by: Rich Felker <dalias@libc.org>
-rw-r--r--arch/sh/kernel/cpu/sh2/entry.S50
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh2/entry.S b/arch/sh/kernel/cpu/sh2/entry.S
index 16bde0efaca3..1ee0a6e774c6 100644
--- a/arch/sh/kernel/cpu/sh2/entry.S
+++ b/arch/sh/kernel/cpu/sh2/entry.S
@@ -47,6 +47,13 @@ ENTRY(exception_handler)
mov.l r3,@-sp
cli
mov.l $cpu_mode,r2
+#ifdef CONFIG_SMP
+ mov.l $cpuid,r3
+ mov.l @r3,r3
+ mov.l @r3,r3
+ shll2 r3
+ add r3,r2
+#endif
mov.l @r2,r0
mov.l @(5*4,r15),r3 ! previous SR
or r0,r3 ! set MD
@@ -57,6 +64,13 @@ ENTRY(exception_handler)
mov.l __md_bit,r0
mov.l r0,@r2 ! enter kernel mode
mov.l $current_thread_info,r2
+#ifdef CONFIG_SMP
+ mov.l $cpuid,r0
+ mov.l @r0,r0
+ mov.l @r0,r0
+ shll2 r0
+ add r0,r2
+#endif
mov.l @r2,r2
mov #(THREAD_SIZE >> 8),r0
shll8 r0
@@ -265,6 +279,13 @@ restore_all:
lds.l @r0+,macl
mov r15,r0
mov.l $cpu_mode,r2
+#ifdef CONFIG_SMP
+ mov.l $cpuid,r3
+ mov.l @r3,r3
+ mov.l @r3,r3
+ shll2 r3
+ add r3,r2
+#endif
mov #OFF_SR,r3
mov.l @(r0,r3),r1
mov.l __md_bit,r3
@@ -281,6 +302,13 @@ restore_all:
mov.l r1,@r2 ! set pc
get_current_thread_info r0, r1
mov.l $current_thread_info,r1
+#ifdef CONFIG_SMP
+ mov.l $cpuid,r3
+ mov.l @r3,r3
+ mov.l @r3,r3
+ shll2 r3
+ add r3,r1
+#endif
mov.l r0,@r1
mov.l @r15+,r0
mov.l @r15+,r1
@@ -308,19 +336,41 @@ $current_thread_info:
.long __current_thread_info
$cpu_mode:
.long __cpu_mode
+#ifdef CONFIG_SMP
+$cpuid:
+ .long sh2_cpuid_addr
+#endif
! common exception handler
#include "../../entry-common.S"
+
+#ifdef CONFIG_NR_CPUS
+#define NR_CPUS CONFIG_NR_CPUS
+#else
+#define NR_CPUS 1
+#endif
.data
! cpu operation mode
! bit30 = MD (compatible SH3/4)
__cpu_mode:
+ .rept NR_CPUS
.long 0x40000000
+ .endr
+
+#ifdef CONFIG_SMP
+.global sh2_cpuid_addr
+sh2_cpuid_addr:
+ .long dummy_cpuid
+dummy_cpuid:
+ .long 0
+#endif
.section .bss
__current_thread_info:
+ .rept NR_CPUS
.long 0
+ .endr
ENTRY(exception_handling_table)
.space 4*32