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authorMichael Ellerman <mpe@ellerman.id.au>2014-07-10 12:29:19 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-07-28 14:10:22 +1000
commit376af5947c0e441ccbf98f0212d4ffbf171528f6 (patch)
tree8d80f48caea9448257de40a2a9c7279cc80e60b0 /arch/powerpc/include
parent468a33028edd62549ad3c4dcbc23dd0311c67832 (diff)
downloadop-kernel-dev-376af5947c0e441ccbf98f0212d4ffbf171528f6.zip
op-kernel-dev-376af5947c0e441ccbf98f0212d4ffbf171528f6.tar.gz
powerpc: Remove STAB code
Old cpus didn't have a Segment Lookaside Buffer (SLB), instead they had a Segment Table (STAB). Now that we've dropped support for those cpus, we can remove the STAB support entirely. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include')
-rw-r--r--arch/powerpc/include/asm/mmu-hash64.h22
-rw-r--r--arch/powerpc/include/asm/mmu_context.h3
-rw-r--r--arch/powerpc/include/asm/paca.h4
-rw-r--r--arch/powerpc/include/asm/reg.h2
4 files changed, 1 insertions, 30 deletions
diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h
index c2b4dcf..d765144 100644
--- a/arch/powerpc/include/asm/mmu-hash64.h
+++ b/arch/powerpc/include/asm/mmu-hash64.h
@@ -25,26 +25,6 @@
#include <asm/processor.h>
/*
- * Segment table
- */
-
-#define STE_ESID_V 0x80
-#define STE_ESID_KS 0x20
-#define STE_ESID_KP 0x10
-#define STE_ESID_N 0x08
-
-#define STE_VSID_SHIFT 12
-
-/* Location of cpu0's segment table */
-#define STAB0_PAGE 0x8
-#define STAB0_OFFSET (STAB0_PAGE << 12)
-#define STAB0_PHYS_ADDR (STAB0_OFFSET + PHYSICAL_START)
-
-#ifndef __ASSEMBLY__
-extern char initial_stab[];
-#endif /* ! __ASSEMBLY */
-
-/*
* SLB
*/
@@ -370,10 +350,8 @@ extern void hpte_init_lpar(void);
extern void hpte_init_beat(void);
extern void hpte_init_beat_v3(void);
-extern void stabs_alloc(void);
extern void slb_initialize(void);
extern void slb_flush_and_rebolt(void);
-extern void stab_initialize(unsigned long stab);
extern void slb_vmalloc_update(void);
extern void slb_set_size(u16 size);
diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
index b467530..f5690e2 100644
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -18,7 +18,6 @@ extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
extern void destroy_context(struct mm_struct *mm);
extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next);
-extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
extern void set_context(unsigned long id, pgd_t *pgd);
@@ -79,8 +78,6 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
#ifdef CONFIG_PPC_STD_MMU_64
if (mmu_has_feature(MMU_FTR_SLB))
switch_slb(tsk, next);
- else
- switch_stab(tsk, next);
#else
/* Out of line for now */
switch_mmu_context(prev, next);
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
index bb0bd25..5abde4e 100644
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h
@@ -78,10 +78,6 @@ struct paca_struct {
u64 kernel_toc; /* Kernel TOC address */
u64 kernelbase; /* Base address of kernel */
u64 kernel_msr; /* MSR while running in kernel */
-#ifdef CONFIG_PPC_STD_MMU_64
- u64 stab_real; /* Absolute address of segment table */
- u64 stab_addr; /* Virtual address of segment table */
-#endif /* CONFIG_PPC_STD_MMU_64 */
void *emergency_sp; /* pointer to emergency stack */
u64 data_offset; /* per cpu data offset */
s16 hw_cpu_id; /* Physical processor number */
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index bffd89d..f7b97b8 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -254,7 +254,7 @@
#define DSISR_PROTFAULT 0x08000000 /* protection fault */
#define DSISR_ISSTORE 0x02000000 /* access was a store */
#define DSISR_DABRMATCH 0x00400000 /* hit data breakpoint */
-#define DSISR_NOSEGMENT 0x00200000 /* STAB/SLB miss */
+#define DSISR_NOSEGMENT 0x00200000 /* SLB miss */
#define DSISR_KEYFAULT 0x00200000 /* Key fault */
#define SPRN_TBRL 0x10C /* Time Base Read Lower Register (user, R/O) */
#define SPRN_TBRU 0x10D /* Time Base Read Upper Register (user, R/O) */
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