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powerpc/fsl-booke: Move loadcam_entry back to asm code to fix SMP ftrace 

When we build with ftrace enabled its possible that loadcam_entry would
have used the stack pointer (even though the code doesn't need it).  We
call loadcam_entry in __secondary_start before the stack is setup.  To
ensure that loadcam_entry doesn't use the stack pointer the easiest
solution is to just have it in asm code.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Kumar Gala 2010-05-13 14:38:21 -05:00
parent 78e2e68a2b
commit 78f622377f
4 changed files with 47 additions and 22 deletions
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8
arch/powerpc/kernel/asm-offsets.c
View File

@ -448,6 +448,14 @@ int main(void)
DEFINE(PGD_T_LOG2, PGD_T_LOG2);
DEFINE(PTE_T_LOG2, PTE_T_LOG2);
#endif
#ifdef CONFIG_FSL_BOOKE
DEFINE(TLBCAM_SIZE, sizeof(struct tlbcam));
DEFINE(TLBCAM_MAS0, offsetof(struct tlbcam, MAS0));
DEFINE(TLBCAM_MAS1, offsetof(struct tlbcam, MAS1));
DEFINE(TLBCAM_MAS2, offsetof(struct tlbcam, MAS2));
DEFINE(TLBCAM_MAS3, offsetof(struct tlbcam, MAS3));
DEFINE(TLBCAM_MAS7, offsetof(struct tlbcam, MAS7));
#endif
#ifdef CONFIG_KVM_EXIT_TIMING
DEFINE(VCPU_TIMING_EXIT_TBU, offsetof(struct kvm_vcpu,

25
arch/powerpc/mm/fsl_booke_mmu.c
View File

@ -2,7 +2,7 @@
* Modifications by Kumar Gala (galak@kernel.crashing.org) to support
* E500 Book E processors.
*
* Copyright 2004 Freescale Semiconductor, Inc
* Copyright 2004,2010 Freescale Semiconductor, Inc.
*
* This file contains the routines for initializing the MMU
* on the 4xx series of chips.
@ -56,19 +56,13 @@
unsigned int tlbcam_index;
#define NUM_TLBCAMS (64)
#if defined(CONFIG_LOWMEM_CAM_NUM_BOOL) && (CONFIG_LOWMEM_CAM_NUM >= NUM_TLBCAMS)
#error "LOWMEM_CAM_NUM must be less than NUM_TLBCAMS"
#endif
struct tlbcam {
u32 MAS0;
u32 MAS1;
unsigned long MAS2;
u32 MAS3;
u32 MAS7;
} TLBCAM[NUM_TLBCAMS];
#define NUM_TLBCAMS (64)
struct tlbcam TLBCAM[NUM_TLBCAMS];
struct tlbcamrange {
unsigned long start;
@ -109,19 +103,6 @@ unsigned long p_mapped_by_tlbcam(phys_addr_t pa)
return 0;
}
void loadcam_entry(int idx)
{
mtspr(SPRN_MAS0, TLBCAM[idx].MAS0);
mtspr(SPRN_MAS1, TLBCAM[idx].MAS1);
mtspr(SPRN_MAS2, TLBCAM[idx].MAS2);
mtspr(SPRN_MAS3, TLBCAM[idx].MAS3);
if (mmu_has_feature(MMU_FTR_BIG_PHYS))
mtspr(SPRN_MAS7, TLBCAM[idx].MAS7);
asm volatile("isync;tlbwe;isync" : : : "memory");
}
/*
* Set up one of the I/D BAT (block address translation) register pairs.
* The parameters are not checked; in particular size must be a power

8
arch/powerpc/mm/mmu_decl.h
View File

@ -144,7 +144,15 @@ extern unsigned long mmu_mapin_ram(unsigned long top);
extern void MMU_init_hw(void);
extern unsigned long mmu_mapin_ram(unsigned long top);
extern void adjust_total_lowmem(void);
extern void loadcam_entry(unsigned int index);
struct tlbcam {
u32 MAS0;
u32 MAS1;
unsigned long MAS2;
u32 MAS3;
u32 MAS7;
};
#elif defined(CONFIG_PPC32)
/* anything 32-bit except 4xx or 8xx */
extern void MMU_init_hw(void);

28
arch/powerpc/mm/tlb_nohash_low.S
View File

@ -365,3 +365,31 @@ _GLOBAL(set_context)
#else
#error Unsupported processor type !
#endif
#if defined(CONFIG_FSL_BOOKE)
/*
* extern void loadcam_entry(unsigned int index)
*
* Load TLBCAM[index] entry in to the L2 CAM MMU
*/
_GLOBAL(loadcam_entry)
LOAD_REG_ADDR(r4, TLBCAM)
mulli r5,r3,TLBCAM_SIZE
add r3,r5,r4
lwz r4,TLBCAM_MAS0(r3)
mtspr SPRN_MAS0,r4
lwz r4,TLBCAM_MAS1(r3)
mtspr SPRN_MAS1,r4
PPC_LL r4,TLBCAM_MAS2(r3)
mtspr SPRN_MAS2,r4
lwz r4,TLBCAM_MAS3(r3)
mtspr SPRN_MAS3,r4
BEGIN_MMU_FTR_SECTION
lwz r4,TLBCAM_MAS7(r3)
mtspr SPRN_MAS7,r4
END_MMU_FTR_SECTION_IFSET(MMU_FTR_BIG_PHYS)
isync
tlbwe
isync
blr
#endif