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powerpc: Factor do_feature_fixup calls 

32 and 64-bit do a similar set of calls early on, we move it all to
a single common function to make the boot code more readable.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2016-07-05 15:03:41 +10:00 committed by Michael Ellerman
parent b9c13fe32f
commit 9402c68461
5 changed files with 37 additions and 30 deletions
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4
arch/powerpc/include/asm/feature-fixups.h
View File

@ -184,4 +184,8 @@ label##3: \
FTR_ENTRY_OFFSET label##1b-label##3b; \
.popsection;
#ifndef __ASSEMBLY__
void apply_feature_fixups(void);
#endif
#endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */

1
arch/powerpc/include/asm/synch.h
View File

@ -13,7 +13,6 @@
extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup;
extern void do_lwsync_fixups(unsigned long value, void *fixup_start,
void *fixup_end);
extern void do_final_fixups(void);
static inline void eieio(void)
{

17
arch/powerpc/kernel/setup_32.c
View File

@ -70,7 +70,6 @@ int ucache_bsize;
notrace unsigned long __init early_init(unsigned long dt_ptr)
{
unsigned long offset = reloc_offset();
struct cpu_spec *spec;
/* First zero the BSS -- use memset_io, some platforms don't have
* caches on yet */
@ -81,21 +80,9 @@ notrace unsigned long __init early_init(unsigned long dt_ptr)
* Identify the CPU type and fix up code sections
* that depend on which cpu we have.
*/
spec = identify_cpu(offset, mfspr(SPRN_PVR));
identify_cpu(offset, mfspr(SPRN_PVR));
do_feature_fixups(spec->cpu_features,
PTRRELOC(&__start___ftr_fixup),
PTRRELOC(&__stop___ftr_fixup));
do_feature_fixups(spec->mmu_features,
PTRRELOC(&__start___mmu_ftr_fixup),
PTRRELOC(&__stop___mmu_ftr_fixup));
do_lwsync_fixups(spec->cpu_features,
PTRRELOC(&__start___lwsync_fixup),
PTRRELOC(&__stop___lwsync_fixup));
do_final_fixups();
apply_feature_fixups();
return KERNELBASE + offset;
}

13
arch/powerpc/kernel/setup_64.c
View File

@ -467,18 +467,7 @@ void __init setup_system(void)
{
DBG(" -> setup_system()\n");
/* Apply the CPUs-specific and firmware specific fixups to kernel
* text (nop out sections not relevant to this CPU or this firmware)
*/
do_feature_fixups(cur_cpu_spec->cpu_features,
&__start___ftr_fixup, &__stop___ftr_fixup);
do_feature_fixups(cur_cpu_spec->mmu_features,
&__start___mmu_ftr_fixup, &__stop___mmu_ftr_fixup);
do_feature_fixups(powerpc_firmware_features,
&__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
do_lwsync_fixups(cur_cpu_spec->cpu_features,
&__start___lwsync_fixup, &__stop___lwsync_fixup);
do_final_fixups();
apply_feature_fixups();
/*
* Unflatten the device-tree passed by prom_init or kexec

32
arch/powerpc/lib/feature-fixups.c
View File

@ -20,7 +20,8 @@
#include <asm/code-patching.h>
#include <asm/page.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/firmware.h>
struct fixup_entry {
unsigned long mask;
@ -130,7 +131,7 @@ void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)
}
}
void do_final_fixups(void)
static void do_final_fixups(void)
{
#if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE)
int *src, *dest;
@ -151,6 +152,33 @@ void do_final_fixups(void)
#endif
}
void apply_feature_fixups(void)
{
struct cpu_spec *spec = *PTRRELOC(&cur_cpu_spec);
/*
* Apply the CPU-specific and firmware specific fixups to kernel text
* (nop out sections not relevant to this CPU or this firmware).
*/
do_feature_fixups(spec->cpu_features,
PTRRELOC(&__start___ftr_fixup),
PTRRELOC(&__stop___ftr_fixup));
do_feature_fixups(spec->mmu_features,
PTRRELOC(&__start___mmu_ftr_fixup),
PTRRELOC(&__stop___mmu_ftr_fixup));
do_lwsync_fixups(spec->cpu_features,
PTRRELOC(&__start___lwsync_fixup),
PTRRELOC(&__stop___lwsync_fixup));
#ifdef CONFIG_PPC64
do_feature_fixups(powerpc_firmware_features,
&__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
#endif
do_final_fixups();
}
#ifdef CONFIG_FTR_FIXUP_SELFTEST
#define check(x) \