diff options
Diffstat (limited to 'include/asm-alpha/fpu.h')
| -rw-r--r-- | include/asm-alpha/fpu.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/include/asm-alpha/fpu.h b/include/asm-alpha/fpu.h index 25148b14b..ab9b28f6e 100644 --- a/include/asm-alpha/fpu.h +++ b/include/asm-alpha/fpu.h @@ -81,4 +81,38 @@ ieee_swcr_to_fpcr(unsigned long sw) return fp; } +#ifdef __KERNEL__ + +/* The following two functions don't need trapb/excb instructions + around the mf_fpcr/mt_fpcr instructions because (a) the kernel + never generates arithmetic faults and (b) call_pal instructions + are implied trap barriers. */ + +static inline unsigned long rdfpcr(void) +{ + unsigned long tmp, ret; + __asm__ ("stt $f0,%0\n\t" + "mf_fpcr $f0\n\t" + "stt $f0,%1\n\t" + "ldt $f0,%0" + : "=m"(tmp), "=m"(ret)); + return ret; +} + +static inline void wrfpcr(unsigned long val) +{ + unsigned long tmp; + __asm__ __volatile__ ( + "stt $f0,%0\n\t" + "ldt $f0,%1\n\t" + "mt_fpcr $f0\n\t" + "ldt $f0,%0" + : "=m"(tmp) : "m"(val)); +} + +extern unsigned long alpha_read_fp_reg (unsigned long reg); +extern void alpha_write_fp_reg (unsigned long reg, unsigned long val); + +#endif /* __KERNEL__ */ + #endif /* __ASM_ALPHA_FPU_H */ |