[ARM] 5388/1: Add hwcap bits for VFPv3 and VFPv3D16

The VFPv3D16 is a VFPv3 CPU configuration where only 16 double registers
are present, as the VFPv2 configuration. This patch adds the
corresponding hwcap bits so that applications or debuggers have more
information about the supported features.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/include/asm/hwcap.h b/arch/arm/include/asm/hwcap.h
index bda489f..f7bd52b 100644 (file)
--- a/arch/arm/include/asm/hwcap.h
+++ b/arch/arm/include/asm/hwcap.h
@@ -17,6 +17,8 @@
 #define HWCAP_CRUNCH   1024
 #define HWCAP_THUMBEE  2048
 #define HWCAP_NEON     4096
+#define HWCAP_VFPv3    8192
+#define HWCAP_VFPv3D16 16384
 
 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
 /*

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 7049815..645ec74 100644 (file)
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -779,6 +779,8 @@ static const char *hwcap_str[] = {
        "crunch",
        "thumbee",
        "neon",
+       "vfpv3",
+       "vfpv3d16",
        NULL
 };
 

diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index 7e12390..75457b3 100644 (file)
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -476,6 +476,18 @@ static int __init vfp_init(void)
                 * in place; report VFP support to userspace.
                 */
                elf_hwcap |= HWCAP_VFP;
+#ifdef CONFIG_VFPv3
+               if (VFP_arch >= 3) {
+                       elf_hwcap |= HWCAP_VFPv3;
+
+                       /*
+                        * Check for VFPv3 D16. CPUs in this configuration
+                        * only have 16 x 64bit registers.
+                        */
+                       if (((fmrx(MVFR0) & MVFR0_A_SIMD_MASK)) == 1)
+                               elf_hwcap |= HWCAP_VFPv3D16;
+               }
+#endif
 #ifdef CONFIG_NEON
                /*
                 * Check for the presence of the Advanced SIMD