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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2007-01-02 23:40:30 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-01-02 23:40:30 +0000 |
| commit | 8e140362f71ed801c69c5df63a68fc2cd07da3a9 (patch) | |
| tree | 336c6391cba17d825964ae6a8e19bb5676c9dc59 | |
| parent | 1c9d3df5e88ad7db23f5b22f4341c39722a904a4 (diff) | |
| download | lwn-8e140362f71ed801c69c5df63a68fc2cd07da3a9.tar.gz lwn-8e140362f71ed801c69c5df63a68fc2cd07da3a9.zip | |
[ARM] Fix VFP initialisation issue for SMP systems
When we install the handlers for context switching, we must enable
VFP on all CPU cores, otherwise undefined (and random) effects
occur.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index e26cc1f59948..490d9d18a7d1 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -264,6 +264,18 @@ void VFP9_bounce(u32 trigger, u32 fpexc, struct pt_regs *regs) vfp_raise_exceptions(exceptions, trigger, orig_fpscr, regs); } +static void vfp_enable(void *unused) +{ + u32 access = get_copro_access(); + + /* + * Enable full access to VFP (cp10 and cp11) + */ + set_copro_access(access | CPACC_FULL(10) | CPACC_FULL(11)); +} + +#include <linux/smp.h> + /* * VFP support code initialisation. */ @@ -288,6 +300,7 @@ static int __init vfp_init(void) * we just need to read the VFPSID register. */ vfpsid = fmrx(FPSID); + barrier(); printk(KERN_INFO "VFP support v0.3: "); if (VFP_arch) { @@ -301,6 +314,8 @@ static int __init vfp_init(void) } else if (vfpsid & FPSID_NODOUBLE) { printk("no double precision support\n"); } else { + smp_call_function(vfp_enable, NULL, 1, 1); + VFP_arch = (vfpsid & FPSID_ARCH_MASK) >> FPSID_ARCH_BIT; /* Extract the architecture version */ printk("implementor %02x architecture %d part %02x variant %x rev %x\n", (vfpsid & FPSID_IMPLEMENTER_MASK) >> FPSID_IMPLEMENTER_BIT, |