sh: CPU flags in AT_HWCAP in ELF auxvt.

Encode processor flags in AT_HWCAP in the ELF auxiliary vector.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

4 files changed, 27 insertions, 18 deletions

diff --git a/arch/sh/kernel/cpu/sh4/probe.c b/arch/sh/kernel/cpu/sh4/probe.c
index 6e8a2b5268e8..0e65aa6ddcaa 100644
--- a/arch/sh/kernel/cpu/sh4/probe.c
+++ b/arch/sh/kernel/cpu/sh4/probe.c
@@ -76,6 +76,7 @@ int __init detect_cpu_and_cache_system(void)
                 cpu_data->type = CPU_SH73180;
                 cpu_data->icache.ways = 4;
                 cpu_data->dcache.ways = 4;
+                cpu_data->flags |= CPU_HAS_LLSC;
                 break;
         case 0x2001:
         case 0x2004:
@@ -83,7 +84,7 @@ int __init detect_cpu_and_cache_system(void)
                 cpu_data->icache.ways = 4;
                 cpu_data->dcache.ways = 4;
 
-                cpu_data->flags |= CPU_HAS_FPU;
+                cpu_data->flags |= CPU_HAS_FPU | CPU_HAS_LLSC;
                 break;
         case 0x2006:
         case 0x200A:
@@ -95,13 +96,15 @@ int __init detect_cpu_and_cache_system(void)
                 cpu_data->icache.ways = 4;
                 cpu_data->dcache.ways = 4;
 
-                cpu_data->flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER;
+                cpu_data->flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
+                                   CPU_HAS_LLSC;
                 break;
         case 0x3000:
         case 0x3003:
                 cpu_data->type = CPU_SH7343;
                 cpu_data->icache.ways = 4;
                 cpu_data->dcache.ways = 4;
+                cpu_data->flags |= CPU_HAS_LLSC;
                 break;
         case 0x8000:
                 cpu_data->type = CPU_ST40RA;
@@ -180,4 +183,3 @@ int __init detect_cpu_and_cache_system(void)
 
         return 0;
 }
-
diff --git a/include/asm-sh/cpu-features.h b/include/asm-sh/cpu-features.h
new file mode 100644
index 000000000000..e398947ec01d
--- /dev/null
+++ b/include/asm-sh/cpu-features.h
@@ -0,0 +1,15 @@
+#ifndef __ASM_SH_CPU_FEATURES_H
+#define __ASM_SH_CPU_FEATURES_H
+
+/*
+ * Processor flags
+ */
+#define CPU_HAS_FPU             0x0001  /* Hardware FPU support */
+#define CPU_HAS_P2_FLUSH_BUG    0x0002  /* Need to flush the cache in P2 area */
+#define CPU_HAS_MMU_PAGE_ASSOC  0x0004  /* SH3: TLB way selection bit support */
+#define CPU_HAS_DSP             0x0008  /* SH-DSP: DSP support */
+#define CPU_HAS_PERF_COUNTER    0x0010  /* Hardware performance counters */
+#define CPU_HAS_PTEA            0x0020  /* PTEA register */
+#define CPU_HAS_LLSC            0x0040  /* movli.l/movco.l */
+
+#endif /* __ASM_SH_CPU_FEATURES_H */
diff --git a/include/asm-sh/elf.h b/include/asm-sh/elf.h
index 1b63dfeea4f2..cc8e5e767345 100644
--- a/include/asm-sh/elf.h
+++ b/include/asm-sh/elf.h
@@ -1,6 +1,11 @@
 #ifndef __ASM_SH_ELF_H
 #define __ASM_SH_ELF_H
 
+#include <asm/processor.h>
+#include <asm/auxvec.h>
+#include <asm/ptrace.h>
+#include <asm/user.h>
+
 /* SH relocation types  */
 #define R_SH_NONE               0
 #define R_SH_DIR32              1
@@ -46,9 +51,6 @@
  * ELF register definitions..
  */
 
-#include <asm/ptrace.h>
-#include <asm/user.h>
-
 typedef unsigned long elf_greg_t;
 
 #define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))
@@ -91,7 +93,7 @@ typedef struct user_fpu_struct elf_fpregset_t;
    instruction set this CPU supports.  This could be done in user space,
    but it's not easy, and we've already done it here.  */
 
-#define ELF_HWCAP       (0)
+#define ELF_HWCAP       (boot_cpu_data.flags)
 
 /* This yields a string that ld.so will use to load implementation
    specific libraries for optimization.  This is more specific in
diff --git a/include/asm-sh/processor.h b/include/asm-sh/processor.h
index 3b3ef4f2bf31..bdd472705546 100644
--- a/include/asm-sh/processor.h
+++ b/include/asm-sh/processor.h
@@ -14,6 +14,7 @@
 #include <asm/types.h>
 #include <asm/cache.h>
 #include <asm/ptrace.h>
+#include <asm/cpu-features.h>
 
 /*
  * Default implementation of macro that returns current
@@ -127,17 +128,6 @@ union sh_fpu_union {
         struct sh_fpu_soft_struct soft;
 };
 
-/*
- * Processor flags
- */
-
-#define CPU_HAS_FPU             0x0001  /* Hardware FPU support */
-#define CPU_HAS_P2_FLUSH_BUG    0x0002  /* Need to flush the cache in P2 area */
-#define CPU_HAS_MMU_PAGE_ASSOC  0x0004  /* SH3: TLB way selection bit support */
-#define CPU_HAS_DSP             0x0008  /* SH-DSP: DSP support */
-#define CPU_HAS_PERF_COUNTER    0x0010  /* Hardware performance counters */
-#define CPU_HAS_PTEA            0x0020  /* PTEA register */
-
 struct thread_struct {
         unsigned long sp;
         unsigned long pc;