diff options
Diffstat (limited to 'arch/arc/kernel/fpu.c')
| -rw-r--r-- | arch/arc/kernel/fpu.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/arch/arc/kernel/fpu.c b/arch/arc/kernel/fpu.c index 07e22b563fbb..ec640219d989 100644 --- a/arch/arc/kernel/fpu.c +++ b/arch/arc/kernel/fpu.c @@ -6,7 +6,9 @@ */ #include <linux/sched.h> -#include <asm/switch_to.h> +#include <asm/fpu.h> + +#ifdef CONFIG_ISA_ARCOMPACT /* * To save/restore FPU regs, simplest scheme would use LR/SR insns. @@ -50,3 +52,31 @@ void fpu_save_restore(struct task_struct *prev, struct task_struct *next) : "r" (zero), "r" (*(readfrom + 3)), "r" (*(readfrom + 2)) ); } + +#else + +void fpu_init_task(struct pt_regs *regs) +{ + const unsigned int fwe = 0x80000000; + + /* default rounding mode */ + write_aux_reg(ARC_REG_FPU_CTRL, 0x100); + + /* Initialize to zero: setting requires FWE be set */ + write_aux_reg(ARC_REG_FPU_STATUS, fwe); +} + +void fpu_save_restore(struct task_struct *prev, struct task_struct *next) +{ + struct arc_fpu *save = &prev->thread.fpu; + struct arc_fpu *restore = &next->thread.fpu; + const unsigned int fwe = 0x80000000; + + save->ctrl = read_aux_reg(ARC_REG_FPU_CTRL); + save->status = read_aux_reg(ARC_REG_FPU_STATUS); + + write_aux_reg(ARC_REG_FPU_CTRL, restore->ctrl); + write_aux_reg(ARC_REG_FPU_STATUS, (fwe | restore->status)); +} + +#endif |