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| author | Guo Ren <guoren@linux.alibaba.com> | 2022-04-18 21:01:54 +0800 |
|---|---|---|
| committer | Guo Ren <guoren@linux.alibaba.com> | 2022-07-30 11:12:03 -0400 |
| commit | 4e8bb4ba5a558159ffbfa7e60322a1c151c3903c (patch) | |
| tree | c7dd06510ade6d45e5d67799ada379795d489437 /arch/csky/include | |
| parent | 01ab4649ef5a377074d2ad4bf2ba6d2270d2807b (diff) | |
| download | linux-4e8bb4ba5a558159ffbfa7e60322a1c151c3903c.tar.gz linux-4e8bb4ba5a558159ffbfa7e60322a1c151c3903c.tar.bz2 linux-4e8bb4ba5a558159ffbfa7e60322a1c151c3903c.zip | |
csky: Add jump-label implementation
Add jump-label implementation for static branch
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Diffstat (limited to 'arch/csky/include')
| -rw-r--r-- | arch/csky/include/asm/jump_label.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/csky/include/asm/jump_label.h b/arch/csky/include/asm/jump_label.h new file mode 100644 index 000000000000..d488ba6084bc --- /dev/null +++ b/arch/csky/include/asm/jump_label.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef __ASM_CSKY_JUMP_LABEL_H +#define __ASM_CSKY_JUMP_LABEL_H + +#ifndef __ASSEMBLY__ + +#include <linux/types.h> + +#define JUMP_LABEL_NOP_SIZE 4 + +static __always_inline bool arch_static_branch(struct static_key *key, + bool branch) +{ + asm_volatile_goto( + "1: nop32 \n" + " .pushsection __jump_table, \"aw\" \n" + " .align 2 \n" + " .long 1b - ., %l[label] - . \n" + " .long %0 - . \n" + " .popsection \n" + : : "i"(&((char *)key)[branch]) : : label); + + return false; +label: + return true; +} + +static __always_inline bool arch_static_branch_jump(struct static_key *key, + bool branch) +{ + asm_volatile_goto( + "1: bsr32 %l[label] \n" + " .pushsection __jump_table, \"aw\" \n" + " .align 2 \n" + " .long 1b - ., %l[label] - . \n" + " .long %0 - . \n" + " .popsection \n" + : : "i"(&((char *)key)[branch]) : : label); + + return false; +label: + return true; +} + +#endif /* __ASSEMBLY__ */ +#endif /* __ASM_CSKY_JUMP_LABEL_H */ |