From 00fc82f17cff9295387d516384ecdc443acb1b22 Mon Sep 17 00:00:00 2001 From: Bradley Morgan Date: Sat, 3 Oct 2026 18:57:38 +0000 Subject: tashaboot: arm64 bringup, semihosting payload loader consoles on the pl011 the dtb points at, walks the memory node and chosen, loads an arm64 kernel Image over semihosting and jumps to it with the documented register state. string functions, printf and libfdt are vendored from lk (lk2nd) and u-boot so the libc surface is the one those projects already proved. built and booted on qemu virt, payload exits clean through semihosting. --- include/endian.h | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 include/endian.h (limited to 'include/endian.h') diff --git a/include/endian.h b/include/endian.h new file mode 100644 index 0000000..42f880c --- /dev/null +++ b/include/endian.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * endian.h - byte order swaps. arm64 and ppc64le are both little + * endian, so the macros compile to nothing there, but the big endian + * fallbacks stay so a BE target builds without a rewrite. + * + * Copyright (C) 2026 Bradley Morgan + */ + +#ifndef __ENDIAN_H +#define __ENDIAN_H + +#include + +static inline uint16_t __swap16(uint16_t x) +{ + return (uint16_t)((x << 8) | (x >> 8)); +} + +static inline uint32_t __swap32(uint32_t x) +{ + return ((x << 24) | + ((x & 0xff00) << 8) | + ((x & 0xff0000) >> 8) | + (x >> 24)); +} + +static inline uint64_t __swap64(uint64_t x) +{ + return ((uint64_t)__swap32((uint32_t)x) << 32) | + __swap32((uint32_t)(x >> 32)); +} + +#if defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ + +#define le16_to_cpu(x) __swap16(x) +#define le32_to_cpu(x) __swap32(x) +#define le64_to_cpu(x) __swap64(x) +#define cpu_to_le16(x) __swap16(x) +#define cpu_to_le32(x) __swap32(x) +#define cpu_to_le64(x) __swap64(x) + +#else + +#define le16_to_cpu(x) (x) +#define le32_to_cpu(x) (x) +#define le64_to_cpu(x) (x) +#define cpu_to_le16(x) (x) +#define cpu_to_le32(x) (x) +#define cpu_to_le64(x) (x) + +#endif + +#endif -- cgit v1.2.3