[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>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index 7e1239041b39..75457b30d813 100644
--- 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