diff options
Diffstat (limited to 'arch/arm/vfp/vfpmodule.c')
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 43 |
1 files changed, 18 insertions, 25 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 7f3f59fcaa2..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> @@ -428,26 +429,6 @@ static void vfp_pm_init(void) static inline void vfp_pm_init(void) { } #endif /* CONFIG_PM */ -/* - * Synchronise the hardware VFP state of a thread other than current with the - * saved one. This function is used by the ptrace mechanism. - */ -#ifdef CONFIG_SMP -void vfp_sync_hwstate(struct thread_info *thread) -{ -} - -void vfp_flush_hwstate(struct thread_info *thread) -{ - /* - * On SMP systems, the VFP state is automatically saved at every - * context switch. We mark the thread VFP state as belonging to a - * non-existent CPU so that the saved one will be reloaded when - * needed. - */ - thread->vfpstate.hard.cpu = NR_CPUS; -} -#else void vfp_sync_hwstate(struct thread_info *thread) { unsigned int cpu = get_cpu(); @@ -490,9 +471,18 @@ void vfp_flush_hwstate(struct thread_info *thread) last_VFP_context[cpu] = NULL; } +#ifdef CONFIG_SMP + /* + * For SMP we still have to take care of the case where the thread + * migrates to another CPU and then back to the original CPU on which + * the last VFP user is still the same thread. Mark the thread VFP + * state as belonging to a non-existent CPU so that the saved one will + * be reloaded in the above case. + */ + thread->vfpstate.hard.cpu = NR_CPUS; +#endif put_cpu(); } -#endif #include <linux/smp.h> @@ -545,7 +535,7 @@ static int __init vfp_init(void) */ elf_hwcap |= HWCAP_VFP; #ifdef CONFIG_VFPv3 - if (VFP_arch >= 3) { + if (VFP_arch >= 2) { elf_hwcap |= HWCAP_VFPv3; /* @@ -560,10 +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; |