Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/riscv/include/asm/cpufeature-macros.h
26471 views
1
/* SPDX-License-Identifier: GPL-2.0-only */

2
/*

3
 * Copyright 2022-2024 Rivos, Inc

4
 */

5


6
#ifndef _ASM_CPUFEATURE_MACROS_H

7
#define _ASM_CPUFEATURE_MACROS_H

8


9
#include <asm/hwcap.h>

10
#include <asm/alternative-macros.h>

11


12
#define STANDARD_EXT		0

13


14
bool __riscv_isa_extension_available(const unsigned long *isa_bitmap, unsigned int bit);

15
#define riscv_isa_extension_available(isa_bitmap, ext)	\

16
	__riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_##ext)

17


18
static __always_inline bool __riscv_has_extension_likely(const unsigned long vendor,

19
							 const unsigned long ext)

20
{

21
	asm goto(ALTERNATIVE("j	%l[l_no]", "nop", %[vendor], %[ext], 1)

22
	:

23
	: [vendor] "i" (vendor), [ext] "i" (ext)

24
	:

25
	: l_no);

26


27
	return true;

28
l_no:

29
	return false;

30
}

31


32
static __always_inline bool __riscv_has_extension_unlikely(const unsigned long vendor,

33
							   const unsigned long ext)

34
{

35
	asm goto(ALTERNATIVE("nop", "j	%l[l_yes]", %[vendor], %[ext], 1)

36
	:

37
	: [vendor] "i" (vendor), [ext] "i" (ext)

38
	:

39
	: l_yes);

40


41
	return false;

42
l_yes:

43
	return true;

44
}

45


46
static __always_inline bool riscv_has_extension_unlikely(const unsigned long ext)

47
{

48
	compiletime_assert(ext < RISCV_ISA_EXT_MAX, "ext must be < RISCV_ISA_EXT_MAX");

49


50
	if (IS_ENABLED(CONFIG_RISCV_ALTERNATIVE))

51
		return __riscv_has_extension_unlikely(STANDARD_EXT, ext);

52


53
	return __riscv_isa_extension_available(NULL, ext);

54
}

55


56
static __always_inline bool riscv_has_extension_likely(const unsigned long ext)

57
{

58
	compiletime_assert(ext < RISCV_ISA_EXT_MAX, "ext must be < RISCV_ISA_EXT_MAX");

59


60
	if (IS_ENABLED(CONFIG_RISCV_ALTERNATIVE))

61
		return __riscv_has_extension_likely(STANDARD_EXT, ext);

62


63
	return __riscv_isa_extension_available(NULL, ext);

64
}

65


66
#endif /* _ASM_CPUFEATURE_MACROS_H */

67


68