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authorKumar Gala <galak@kernel.crashing.org>2007-09-13 01:44:20 -0500
committerKumar Gala <galak@kernel.crashing.org>2007-09-14 08:53:30 -0500
commit5e14d21e3f28a4181dacff0336040e30942f4921 (patch)
treeebaa8217d5af80e15116960641a0bf87a8b5d717
parentd8f1324a5063c833862328ceafabc53ac3cc4f71 (diff)
[POWERPC] Add cpu feature for SPE handling
Make it so that SPE support can be determined at runtime. This is similiar to how we handle AltiVec. This allows us to have SPE support built in and work on processors with and without SPE. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
-rw-r--r--arch/powerpc/kernel/cputable.c23
-rw-r--r--arch/powerpc/kernel/entry_32.S4
-rw-r--r--arch/powerpc/kernel/process.c15
-rw-r--r--arch/powerpc/kernel/ptrace.c6
-rw-r--r--include/asm-powerpc/cputable.h26
5 files changed, 46 insertions, 28 deletions
diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
index 5873073c904..8eb8087383e 100644
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -68,15 +68,6 @@ extern void __restore_cpu_ppc970(void);
#define COMMON_USER_BOOKE (PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU | \
PPC_FEATURE_BOOKE)
-/* We only set the spe features if the kernel was compiled with
- * spe support
- */
-#ifdef CONFIG_SPE
-#define PPC_FEATURE_SPE_COMP PPC_FEATURE_HAS_SPE
-#else
-#define PPC_FEATURE_SPE_COMP 0
-#endif
-
static struct cpu_spec cpu_specs[] = {
#ifdef CONFIG_PPC64
{ /* Power3 */
@@ -1261,8 +1252,8 @@ static struct cpu_spec cpu_specs[] = {
/* xxx - galak: add CPU_FTR_MAYBE_CAN_DOZE */
.cpu_features = CPU_FTRS_E200,
.cpu_user_features = COMMON_USER_BOOKE |
- PPC_FEATURE_SPE_COMP |
- PPC_FEATURE_HAS_EFP_SINGLE |
+ PPC_FEATURE_HAS_SPE_COMP |
+ PPC_FEATURE_HAS_EFP_SINGLE_COMP |
PPC_FEATURE_UNIFIED_CACHE,
.dcache_bsize = 32,
.platform = "ppc5554",
@@ -1274,8 +1265,8 @@ static struct cpu_spec cpu_specs[] = {
/* xxx - galak: add CPU_FTR_MAYBE_CAN_DOZE */
.cpu_features = CPU_FTRS_E500,
.cpu_user_features = COMMON_USER_BOOKE |
- PPC_FEATURE_SPE_COMP |
- PPC_FEATURE_HAS_EFP_SINGLE,
+ PPC_FEATURE_HAS_SPE_COMP |
+ PPC_FEATURE_HAS_EFP_SINGLE_COMP,
.icache_bsize = 32,
.dcache_bsize = 32,
.num_pmcs = 4,
@@ -1290,9 +1281,9 @@ static struct cpu_spec cpu_specs[] = {
/* xxx - galak: add CPU_FTR_MAYBE_CAN_DOZE */
.cpu_features = CPU_FTRS_E500_2,
.cpu_user_features = COMMON_USER_BOOKE |
- PPC_FEATURE_SPE_COMP |
- PPC_FEATURE_HAS_EFP_SINGLE |
- PPC_FEATURE_HAS_EFP_DOUBLE,
+ PPC_FEATURE_HAS_SPE_COMP |
+ PPC_FEATURE_HAS_EFP_SINGLE_COMP |
+ PPC_FEATURE_HAS_EFP_DOUBLE_COMP,
.icache_bsize = 32,
.dcache_bsize = 32,
.num_pmcs = 4,
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 4074c0b3145..21d889e63e8 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -504,9 +504,11 @@ BEGIN_FTR_SECTION
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif /* CONFIG_ALTIVEC */
#ifdef CONFIG_SPE
+BEGIN_FTR_SECTION
oris r0,r0,MSR_SPE@h /* Disable SPE */
mfspr r12,SPRN_SPEFSCR /* save spefscr register value */
stw r12,THREAD+THREAD_SPEFSCR(r2)
+END_FTR_SECTION_IFSET(CPU_FTR_SPE)
#endif /* CONFIG_SPE */
and. r0,r0,r11 /* FP or altivec or SPE enabled? */
beq+ 1f
@@ -542,8 +544,10 @@ BEGIN_FTR_SECTION
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif /* CONFIG_ALTIVEC */
#ifdef CONFIG_SPE
+BEGIN_FTR_SECTION
lwz r0,THREAD+THREAD_SPEFSCR(r2)
mtspr SPRN_SPEFSCR,r0 /* restore SPEFSCR reg */
+END_FTR_SECTION_IFSET(CPU_FTR_SPE)
#endif /* CONFIG_SPE */
lwz r0,_CCR(r1)
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index e477c9d0498..57c589c3414 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -669,9 +669,13 @@ int set_fpexc_mode(struct task_struct *tsk, unsigned int val)
* mode (asyn, precise, disabled) for 'Classic' FP. */
if (val & PR_FP_EXC_SW_ENABLE) {
#ifdef CONFIG_SPE
- tsk->thread.fpexc_mode = val &
- (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT);
- return 0;
+ if (cpu_has_feature(CPU_FTR_SPE)) {
+ tsk->thread.fpexc_mode = val &
+ (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT);
+ return 0;
+ } else {
+ return -EINVAL;
+ }
#else
return -EINVAL;
#endif
@@ -697,7 +701,10 @@ int get_fpexc_mode(struct task_struct *tsk, unsigned long adr)
if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE)
#ifdef CONFIG_SPE
- val = tsk->thread.fpexc_mode;
+ if (cpu_has_feature(CPU_FTR_SPE))
+ val = tsk->thread.fpexc_mode;
+ else
+ return -EINVAL;
#else
return -EINVAL;
#endif
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 8a177bd9eab..fb8866e0e35 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -576,8 +576,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
#ifdef CONFIG_SPE
case PTRACE_GETEVRREGS:
/* Get the child spe register state. */
- if (child->thread.regs->msr & MSR_SPE)
- giveup_spe(child);
+ flush_spe_to_thread(child);
ret = get_evrregs((unsigned long __user *)data, child);
break;
@@ -585,8 +584,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
/* Set the child spe register state. */
/* this is to clear the MSR_SPE bit to force a reload
* of register state from memory */
- if (child->thread.regs->msr & MSR_SPE)
- giveup_spe(child);
+ flush_spe_to_thread(child);
ret = set_evrregs(child, (unsigned long __user *)data);
break;
#endif
diff --git a/include/asm-powerpc/cputable.h b/include/asm-powerpc/cputable.h
index 3dc8e2dfca8..f62cffd56c0 100644
--- a/include/asm-powerpc/cputable.h
+++ b/include/asm-powerpc/cputable.h
@@ -136,6 +136,7 @@ extern void do_feature_fixups(unsigned long value, void *fixup_start,
#define CPU_FTR_REAL_LE ASM_CONST(0x0000000000400000)
#define CPU_FTR_FPU_UNAVAILABLE ASM_CONST(0x0000000000800000)
#define CPU_FTR_UNIFIED_ID_CACHE ASM_CONST(0x0000000001000000)
+#define CPU_FTR_SPE ASM_CONST(0x0000000002000000)
/*
* Add the 64-bit processor unique features in the top half of the word;
@@ -180,6 +181,21 @@ extern void do_feature_fixups(unsigned long value, void *fixup_start,
#define PPC_FEATURE_HAS_ALTIVEC_COMP 0
#endif
+/* We only set the spe features if the kernel was compiled with spe
+ * support
+ */
+#ifdef CONFIG_SPE
+#define CPU_FTR_SPE_COMP CPU_FTR_SPE
+#define PPC_FEATURE_HAS_SPE_COMP PPC_FEATURE_HAS_SPE
+#define PPC_FEATURE_HAS_EFP_SINGLE_COMP PPC_FEATURE_HAS_EFP_SINGLE
+#define PPC_FEATURE_HAS_EFP_DOUBLE_COMP PPC_FEATURE_HAS_EFP_DOUBLE
+#else
+#define CPU_FTR_SPE_COMP 0
+#define PPC_FEATURE_HAS_SPE_COMP 0
+#define PPC_FEATURE_HAS_EFP_SINGLE_COMP 0
+#define PPC_FEATURE_HAS_EFP_DOUBLE_COMP 0
+#endif
+
/* We need to mark all pages as being coherent if we're SMP or we
* have a 74[45]x and an MPC107 host bridge. Also 83xx requires
* it for PCI "streaming/prefetch" to work properly.
@@ -310,10 +326,12 @@ extern void do_feature_fixups(unsigned long value, void *fixup_start,
#define CPU_FTRS_8XX (CPU_FTR_USE_TB)
#define CPU_FTRS_40X (CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN)
#define CPU_FTRS_44X (CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN)
-#define CPU_FTRS_E200 (CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN | \
- CPU_FTR_COHERENT_ICACHE | CPU_FTR_UNIFIED_ID_CACHE)
-#define CPU_FTRS_E500 (CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN)
-#define CPU_FTRS_E500_2 (CPU_FTR_USE_TB | \
+#define CPU_FTRS_E200 (CPU_FTR_USE_TB | CPU_FTR_SPE_COMP | \
+ CPU_FTR_NODSISRALIGN | CPU_FTR_COHERENT_ICACHE | \
+ CPU_FTR_UNIFIED_ID_CACHE)
+#define CPU_FTRS_E500 (CPU_FTR_USE_TB | CPU_FTR_SPE_COMP | \
+ CPU_FTR_NODSISRALIGN)
+#define CPU_FTRS_E500_2 (CPU_FTR_USE_TB | CPU_FTR_SPE_COMP | \
CPU_FTR_BIG_PHYS | CPU_FTR_NODSISRALIGN)
#define CPU_FTRS_GENERIC_32 (CPU_FTR_COMMON | CPU_FTR_NODSISRALIGN)