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yaml
---
r: 101720
b: refs/heads/master
c: 51c52e8
h: refs/heads/master
v: v3
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Michael Ellerman authored and Paul Mackerras committed Jul 1, 2008
1 parent bae5839 commit ea622c0
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Showing 4 changed files with 58 additions and 37 deletions.
2 changes: 1 addition & 1 deletion [refs]
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: b7bcda631e87eb3466d0baa9885650ba7d7ed89d
refs/heads/master: 51c52e86694f19e84600a40f6156889feafd8ae9
36 changes: 0 additions & 36 deletions trunk/arch/powerpc/kernel/cputable.c
Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,6 @@
#include <linux/module.h>

#include <asm/oprofile_impl.h>
#include <asm/code-patching.h>
#include <asm/cputable.h>
#include <asm/prom.h> /* for PTRRELOC on ARCH=ppc */

Expand Down Expand Up @@ -1638,38 +1637,3 @@ struct cpu_spec * __init identify_cpu(unsigned long offset, unsigned int pvr)
BUG();
return NULL;
}

void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end)
{
struct fixup_entry {
unsigned long mask;
unsigned long value;
long start_off;
long end_off;
} *fcur, *fend;

fcur = fixup_start;
fend = fixup_end;

for (; fcur < fend; fcur++) {
unsigned int *pstart, *pend, *p;

if ((value & fcur->mask) == fcur->value)
continue;

/* These PTRRELOCs will disappear once the new scheme for
* modules and vdso is implemented
*/
pstart = ((unsigned int *)fcur) + (fcur->start_off / 4);
pend = ((unsigned int *)fcur) + (fcur->end_off / 4);

for (p = pstart; p < pend; p++) {
*p = PPC_NOP_INSTR;
asm volatile ("dcbst 0, %0" : : "r" (p));
}
asm volatile ("sync" : : : "memory");
for (p = pstart; p < pend; p++)
asm volatile ("icbi 0,%0" : : "r" (p));
asm volatile ("sync; isync" : : : "memory");
}
}
1 change: 1 addition & 0 deletions trunk/arch/powerpc/lib/Makefile
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Expand Up @@ -26,3 +26,4 @@ endif
obj-$(CONFIG_PPC_LIB_RHEAP) += rheap.o

obj-y += code-patching.o
obj-y += feature-fixups.o
56 changes: 56 additions & 0 deletions trunk/arch/powerpc/lib/feature-fixups.c
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@@ -0,0 +1,56 @@
/*
* Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
*
* Modifications for ppc64:
* Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
*
* 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/cputable.h>
#include <asm/code-patching.h>


struct fixup_entry {
unsigned long mask;
unsigned long value;
long start_off;
long end_off;
};

static void patch_feature_section(unsigned long value, struct fixup_entry *fcur)
{
unsigned int *pstart, *pend, *p;

if ((value & fcur->mask) == fcur->value)
return;

pstart = ((unsigned int *)fcur) + (fcur->start_off / 4);
pend = ((unsigned int *)fcur) + (fcur->end_off / 4);

for (p = pstart; p < pend; p++) {
*p = PPC_NOP_INSTR;
asm volatile ("dcbst 0, %0" : : "r" (p));
}
asm volatile ("sync" : : : "memory");
for (p = pstart; p < pend; p++)
asm volatile ("icbi 0,%0" : : "r" (p));
asm volatile ("sync; isync" : : : "memory");
}

void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end)
{
struct fixup_entry *fcur, *fend;

fcur = fixup_start;
fend = fixup_end;

for (; fcur < fend; fcur++)
patch_feature_section(value, fcur);
}

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