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powerpc: Split out do_feature_fixups() from cputable.c

Browse source 
The logic to patch CPU feature sections lives in cputable.c, but these days
it's used for CPU features as well as firmware features.  Move it into
it's own file for neatness and as preparation for some additions.

While we're moving the code, we pull the loop body logic into a separate
routine, and remove a comment which doesn't apply anymore.

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>
This commit is contained in:
Michael Ellerman 2008-06-24 11:32:36 +10:00 committed by Paul Mackerras
parent b7bcda631e
commit 51c52e8669
3 changed files with 57 additions and 36 deletions
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36
arch/powerpc/kernel/cputable.c
View file

@ -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 */
@ -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
arch/powerpc/lib/Makefile
View file

@ -26,3 +26,4 @@ endif
obj-$(CONFIG_PPC_LIB_RHEAP) += rheap.o
obj-y += code-patching.o
obj-y += feature-fixups.o

56
arch/powerpc/lib/feature-fixups.c Normal file
View file

@ -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);
}