aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc
diff options
context:
space:
mode:
authorMichael Ellerman <michael@ellerman.id.au>2008-06-24 11:32:21 +1000
committerPaul Mackerras <paulus@samba.org>2008-07-01 11:28:18 +1000
commitaaddd3eacaeaef3503035750b3f21ac2bfe97cbf (patch)
tree2bac0bedc2185edec916679d218e1c8b89276453 /arch/powerpc
parent73f38fe1b563a9d23ffacbda7b51decf41b0c49c (diff)
powerpc: Move code patching code into arch/powerpc/lib/code-patching.c
We currently have a few routines for patching code in asm/system.h, because they didn't fit anywhere else. I'd like to clean them up a little and add some more, so first move them into a dedicated C file - they don't need to be inlined. While we're moving the code, drop create_function_call(), it's intended caller never got merged and will be replaced in future with something different. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/crash_dump.c1
-rw-r--r--arch/powerpc/lib/Makefile2
-rw-r--r--arch/powerpc/lib/code-patching.c33
-rw-r--r--arch/powerpc/platforms/86xx/mpc86xx_smp.c1
-rw-r--r--arch/powerpc/platforms/powermac/smp.c1
5 files changed, 38 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c
index 9ee3c5278db..35b9a668b0e 100644
--- a/arch/powerpc/kernel/crash_dump.c
+++ b/arch/powerpc/kernel/crash_dump.c
@@ -14,6 +14,7 @@
#include <linux/crash_dump.h>
#include <linux/bootmem.h>
#include <linux/lmb.h>
+#include <asm/code-patching.h>
#include <asm/kdump.h>
#include <asm/prom.h>
#include <asm/firmware.h>
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index e522b06cc42..e7f7042b9f6 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -24,3 +24,5 @@ obj-$(CONFIG_SMP) += locks.o
endif
obj-$(CONFIG_PPC_LIB_RHEAP) += rheap.o
+
+obj-y += code-patching.o
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
new file mode 100644
index 00000000000..7afae88ed1d
--- /dev/null
+++ b/arch/powerpc/lib/code-patching.c
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2008 Michael Ellerman, IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <asm/code-patching.h>
+
+
+void create_instruction(unsigned long addr, unsigned int instr)
+{
+ unsigned int *p;
+ p = (unsigned int *)addr;
+ *p = instr;
+ asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r" (p));
+}
+
+void create_branch(unsigned long addr, unsigned long target, int flags)
+{
+ unsigned int instruction;
+
+ if (! (flags & BRANCH_ABSOLUTE))
+ target = target - addr;
+
+ /* Mask out the flags and target, so they don't step on each other. */
+ instruction = 0x48000000 | (flags & 0x3) | (target & 0x03FFFFFC);
+
+ create_instruction(addr, instruction);
+}
diff --git a/arch/powerpc/platforms/86xx/mpc86xx_smp.c b/arch/powerpc/platforms/86xx/mpc86xx_smp.c
index ba55b0ff0f7..63f55853cd6 100644
--- a/arch/powerpc/platforms/86xx/mpc86xx_smp.c
+++ b/arch/powerpc/platforms/86xx/mpc86xx_smp.c
@@ -15,6 +15,7 @@
#include <linux/init.h>
#include <linux/delay.h>
+#include <asm/code-patching.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pci-bridge.h>
diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c
index cb2d894541c..bf202f7eadf 100644
--- a/arch/powerpc/platforms/powermac/smp.c
+++ b/arch/powerpc/platforms/powermac/smp.c
@@ -36,6 +36,7 @@
#include <asm/ptrace.h>
#include <asm/atomic.h>
+#include <asm/code-patching.h>
#include <asm/irq.h>
#include <asm/page.h>
#include <asm/pgtable.h>