From fc00c656c96528112d05cf0edf8631bd5eaea446 Mon Sep 17 00:00:00 2001 From: Kacper Date: Sun, 7 Dec 2025 20:10:31 +0100 Subject: Add build system scaffolding and libc headers --- include/arch/x86_64/linux/const.h | 53 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 include/arch/x86_64/linux/const.h (limited to 'include/arch/x86_64/linux/const.h') diff --git a/include/arch/x86_64/linux/const.h b/include/arch/x86_64/linux/const.h new file mode 100644 index 00000000..f1694e63 --- /dev/null +++ b/include/arch/x86_64/linux/const.h @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* const.h: Macros for dealing with constants. */ + +#ifndef _LINUX_CONST_H +#define _LINUX_CONST_H + +/* Some constant macros are used in both assembler and + * C code. Therefore we cannot annotate them always with + * 'UL' and other type specifiers unilaterally. We + * use the following macros to deal with this. + * + * Similarly, _AT() will cast an expression with a type in C, but + * leave it unchanged in asm. + */ + +#ifdef __ASSEMBLY__ +#define _AC(X, Y) X +#define _AT(T, X) X +#else +#define __AC(X, Y) (X##Y) +#define _AC(X, Y) __AC(X, Y) +#define _AT(T, X) ((T)(X)) +#endif + +#define _UL(x) (_AC(x, UL)) +#define _ULL(x) (_AC(x, ULL)) + +#define _BITUL(x) (_UL(1) << (x)) +#define _BITULL(x) (_ULL(1) << (x)) + +#if !defined(__ASSEMBLY__) +/* + * Missing __asm__ support + * + * __BIT128() would not work in the __asm__ code, as it shifts an + * 'unsigned __int128' data type as direct representation of + * 128 bit constants is not supported in the gcc compiler, as + * they get silently truncated. + * + * TODO: Please revisit this implementation when gcc compiler + * starts representing 128 bit constants directly like long + * and unsigned long etc. Subsequently drop the comment for + * GENMASK_U128() which would then start supporting __asm__ code. + */ +#define _BIT128(x) ((unsigned __int128)(1) << (x)) +#endif + +#define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (__typeof__(x))(a) - 1) +#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) + +#define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) + +#endif /* _LINUX_CONST_H */ -- cgit v1.2.3