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authorTony Lindgren <tony@atomide.com>2010-07-01 13:41:05 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-07-09 14:41:34 +0100
commit5aaf254409f8d58229107b59507a8235b715a960 (patch)
tree30b3a289808a34a1db28a0eb6d92bc160be3bc0c /arch
parente513f8bf240d34bd6e732ba2f74df9ab84686ce6 (diff)
ARM: 6203/1: Make VFPv3 usable on ARMv6
MVFR0 and MVFR1 are only available starting with ARM1136 r1p0 release according to "B.5 VFP changes" in DDI0211F_arm1136_r1p0_trm.pdf. This is also when TLS register got added, so we can use HAS_TLS also to test for MVFR0 and MVFR1. Otherwise VFPFMRX and VFPFMXR access fails and we get: Internal error: Oops - undefined instruction: 0 [#1] PC is at no_old_VFP_process+0x8/0x3c LR is at __und_svc+0x48/0x80 ... Signed-off-by: Tony Lindgren <tony@atomide.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/include/asm/vfpmacros.h18
-rw-r--r--arch/arm/vfp/vfpmodule.c10
2 files changed, 25 insertions, 3 deletions
diff --git a/arch/arm/include/asm/vfpmacros.h b/arch/arm/include/asm/vfpmacros.h
index 422f3cc204a..3d5fc41ae8d 100644
--- a/arch/arm/include/asm/vfpmacros.h
+++ b/arch/arm/include/asm/vfpmacros.h
@@ -3,6 +3,8 @@
*
* Assembler-only file containing VFP macros and register definitions.
*/
+#include <asm/hwcap.h>
+
#include "vfp.h"
@ Macros to allow building with old toolkits (with no VFP support)
@@ -22,12 +24,20 @@
LDC p11, cr0, [\base],#32*4 @ FLDMIAD \base!, {d0-d15}
#endif
#ifdef CONFIG_VFPv3
+#if __LINUX_ARM_ARCH__ <= 6
+ ldr \tmp, =elf_hwcap @ may not have MVFR regs
+ ldr \tmp, [\tmp, #0]
+ tst \tmp, #HWCAP_VFPv3D16
+ ldceq p11, cr0, [\base],#32*4 @ FLDMIAD \base!, {d16-d31}
+ addne \base, \base, #32*4 @ step over unused register space
+#else
VFPFMRX \tmp, MVFR0 @ Media and VFP Feature Register 0
and \tmp, \tmp, #MVFR0_A_SIMD_MASK @ A_SIMD field
cmp \tmp, #2 @ 32 x 64bit registers?
ldceql p11, cr0, [\base],#32*4 @ FLDMIAD \base!, {d16-d31}
addne \base, \base, #32*4 @ step over unused register space
#endif
+#endif
.endm
@ write all the working registers out of the VFP
@@ -38,10 +48,18 @@
STC p11, cr0, [\base],#32*4 @ FSTMIAD \base!, {d0-d15}
#endif
#ifdef CONFIG_VFPv3
+#if __LINUX_ARM_ARCH__ <= 6
+ ldr \tmp, =elf_hwcap @ may not have MVFR regs
+ ldr \tmp, [\tmp, #0]
+ tst \tmp, #HWCAP_VFPv3D16
+ stceq p11, cr0, [\base],#32*4 @ FSTMIAD \base!, {d16-d31}
+ addne \base, \base, #32*4 @ step over unused register space
+#else
VFPFMRX \tmp, MVFR0 @ Media and VFP Feature Register 0
and \tmp, \tmp, #MVFR0_A_SIMD_MASK @ A_SIMD field
cmp \tmp, #2 @ 32 x 64bit registers?
stceql p11, cr0, [\base],#32*4 @ FSTMIAD \base!, {d16-d31}
addne \base, \base, #32*4 @ step over unused register space
#endif
+#endif
.endm
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index 315a540c7ce..8063a322c79 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -15,6 +15,7 @@
#include <linux/sched.h>
#include <linux/init.h>
+#include <asm/cputype.h>
#include <asm/thread_notify.h>
#include <asm/vfp.h>
@@ -549,10 +550,13 @@ static int __init vfp_init(void)
/*
* Check for the presence of the Advanced SIMD
* load/store instructions, integer and single
- * precision floating point operations.
+ * precision floating point operations. Only check
+ * for NEON if the hardware has the MVFR registers.
*/
- if ((fmrx(MVFR1) & 0x000fff00) == 0x00011100)
- elf_hwcap |= HWCAP_NEON;
+ if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
+ if ((fmrx(MVFR1) & 0x000fff00) == 0x00011100)
+ elf_hwcap |= HWCAP_NEON;
+ }
#endif
}
return 0;