diff options
| author | Guo Ren <guoren@linux.alibaba.com> | 2021-01-04 06:37:07 +0300 |
|---|---|---|
| committer | Guo Ren <guoren@linux.alibaba.com> | 2021-01-12 04:52:41 +0300 |
| commit | 87f3248cdb9aeac35129cb4337ce541a945cb35c (patch) | |
| tree | e5bf46123eb160c318adaad9bdb9e490e714a109 /arch/csky/abiv1 | |
| parent | e26db7ad9c319496bcbe6043d9d4e1d1da3ec613 (diff) | |
| download | linux-87f3248cdb9aeac35129cb4337ce541a945cb35c.tar.xz | |
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/abiv1')
| -rw-r--r-- | arch/csky/abiv1/inc/abi/vdso.h | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/arch/csky/abiv1/inc/abi/vdso.h b/arch/csky/abiv1/inc/abi/vdso.h index 14352f524f1d..9e6d0a2fdd2b 100644 --- a/arch/csky/abiv1/inc/abi/vdso.h +++ b/arch/csky/abiv1/inc/abi/vdso.h @@ -1,17 +1,9 @@ /* SPDX-License-Identifier: GPL-2.0 */ -#include <linux/uaccess.h> +#ifndef __ABI_CSKY_VDSO_H +#define __ABI_CSKY_VDSO_H -static inline int setup_vdso_page(unsigned short *ptr) -{ - int err = 0; +/* movi r1, 127; addi r1, (139 - 127) */ +#define SET_SYSCALL_ID .long 0x20b167f1 - /* movi r1, 127 */ - err |= __put_user(0x67f1, ptr + 0); - /* addi r1, (139 - 127) */ - err |= __put_user(0x20b1, ptr + 1); - /* trap 0 */ - err |= __put_user(0x0008, ptr + 2); - - return err; -} +#endif /* __ABI_CSKY_VDSO_H */ |