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| author | Heiko Carstens <hca@linux.ibm.com> | 2024-02-03 13:45:08 +0300 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2024-02-16 16:30:15 +0300 |
| commit | 918c7cad66509c2170e38a088550fb4a525e0878 (patch) | |
| tree | 5a8cc80c61382b65d2499b8462e6c897602feb17 /arch/s390/include/asm/fpu.h | |
| parent | 3a5866a001e83e1aa143fc0aeba0248247483962 (diff) | |
| download | linux-918c7cad66509c2170e38a088550fb4a525e0878.tar.xz | |
s390/fpu: convert __kernel_fpu_begin()/__kernel_fpu_end() to C
Convert the rather large __kernel_fpu_begin()/__kernel_fpu_end() inline
assemblies to C. The C variant is much more readable, and this also allows
to get rid of the non-obvious usage of KERNEL_VXR_* constants within the
inline assemblies. E.g. "tmll %[m],6" correlates with the two bits set in
KERNEL_VXR_LOW. If the corresponding defines would be changed, the inline
assembles would break in a subtle way.
Therefore convert to C, use the proper defines, and allow the compiler to
generate code using the (hopefully) most efficient instructions.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/fpu.h')
| -rw-r--r-- | arch/s390/include/asm/fpu.h | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/arch/s390/include/asm/fpu.h b/arch/s390/include/asm/fpu.h index 6a0a23a28ce8..be85c28cdcde 100644 --- a/arch/s390/include/asm/fpu.h +++ b/arch/s390/include/asm/fpu.h @@ -61,11 +61,19 @@ void save_fpu_regs(void); void load_fpu_regs(void); void __load_fpu_regs(void); -#define KERNEL_FPC 1 -#define KERNEL_VXR_V0V7 2 -#define KERNEL_VXR_V8V15 4 -#define KERNEL_VXR_V16V23 8 -#define KERNEL_VXR_V24V31 16 +enum { + KERNEL_FPC_BIT = 0, + KERNEL_VXR_V0V7_BIT, + KERNEL_VXR_V8V15_BIT, + KERNEL_VXR_V16V23_BIT, + KERNEL_VXR_V24V31_BIT, +}; + +#define KERNEL_FPC BIT(KERNEL_FPC_BIT) +#define KERNEL_VXR_V0V7 BIT(KERNEL_VXR_V0V7_BIT) +#define KERNEL_VXR_V8V15 BIT(KERNEL_VXR_V8V15_BIT) +#define KERNEL_VXR_V16V23 BIT(KERNEL_VXR_V16V23_BIT) +#define KERNEL_VXR_V24V31 BIT(KERNEL_VXR_V24V31_BIT) #define KERNEL_VXR_LOW (KERNEL_VXR_V0V7 | KERNEL_VXR_V8V15) #define KERNEL_VXR_MID (KERNEL_VXR_V8V15 | KERNEL_VXR_V16V23) |