diff options
| author | Guo Ren <guoren@linux.alibaba.com> | 2021-01-04 04:37:07 +0100 |
|---|---|---|
| committer | Guo Ren <guoren@linux.alibaba.com> | 2021-01-12 02:52:41 +0100 |
| commit | 87f3248cdb9aeac35129cb4337ce541a945cb35c (patch) | |
| tree | e5bf46123eb160c318adaad9bdb9e490e714a109 /arch/csky/abiv2/inc | |
| parent | csky: mm: abort uaccess retries upon fatal signal (diff) | |
| download | linux-87f3248cdb9aeac35129cb4337ce541a945cb35c.tar.xz linux-87f3248cdb9aeac35129cb4337ce541a945cb35c.zip | |
csky: Reconstruct VDSO framework
Reconstruct vdso framework to support future vsyscall,
vgettimeofday features. These are very important features to reduce
system calls into the kernel for performance improvement.
The patch is reference RISC-V's
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/csky/abiv2/inc')
| -rw-r--r-- | arch/csky/abiv2/inc/abi/vdso.h | 20 |
1 files changed, 3 insertions, 17 deletions
diff --git a/arch/csky/abiv2/inc/abi/vdso.h b/arch/csky/abiv2/inc/abi/vdso.h index b60d4a070326..40fd10d893ff 100644 --- a/arch/csky/abiv2/inc/abi/vdso.h +++ b/arch/csky/abiv2/inc/abi/vdso.h @@ -3,21 +3,7 @@ #ifndef __ABI_CSKY_VDSO_H #define __ABI_CSKY_VDSO_H -#include <linux/uaccess.h> +/* movi r7, 173 */ +#define SET_SYSCALL_ID .long 0x008bea07 -static inline int setup_vdso_page(unsigned short *ptr) -{ - int err = 0; - - /* movi r7, 173 */ - err |= __put_user(0xea07, ptr); - err |= __put_user(0x008b, ptr+1); - - /* trap 0 */ - err |= __put_user(0xc000, ptr+2); - err |= __put_user(0x2020, ptr+3); - - return err; -} - -#endif /* __ABI_CSKY_STRING_H */ +#endif /* __ABI_CSKY_VDSO_H */ |