mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-26 17:40:27 +00:00
7e94b090fe
This implements a simple bootloader that is capable of loading ELF64 kernel images. It does this by using QEMU/GRUB to load the kernel image from disk and pass it to our bootloader as a Multiboot module. The bootloader then parses the ELF image and sets it up appropriately. The kernel's entry point is a C++ function with architecture-native code. Co-authored-by: Liav A <liavalb@gmail.com>
117 lines
2.6 KiB
C
117 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#ifdef __i386__
|
|
# define AK_ARCH_I386 1
|
|
#endif
|
|
|
|
#ifdef __x86_64__
|
|
# define AK_ARCH_X86_64 1
|
|
#endif
|
|
|
|
#if defined(__APPLE__) && defined(__MACH__)
|
|
# define AK_OS_MACOS
|
|
# define AK_OS_BSD_GENERIC
|
|
#endif
|
|
|
|
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
|
|
# define AK_OS_BSD_GENERIC
|
|
#endif
|
|
|
|
#define ARCH(arch) (defined(AK_ARCH_##arch) && AK_ARCH_##arch)
|
|
|
|
#if !defined(__clang__)
|
|
# define AK_HAS_CONDITIONALLY_TRIVIAL
|
|
#endif
|
|
|
|
#ifdef ALWAYS_INLINE
|
|
# undef ALWAYS_INLINE
|
|
#endif
|
|
#define ALWAYS_INLINE __attribute__((always_inline)) inline
|
|
|
|
#ifdef NEVER_INLINE
|
|
# undef NEVER_INLINE
|
|
#endif
|
|
#define NEVER_INLINE __attribute__((noinline))
|
|
|
|
#ifdef FLATTEN
|
|
# undef FLATTEN
|
|
#endif
|
|
#define FLATTEN __attribute__((flatten))
|
|
|
|
#ifdef RETURNS_NONNULL
|
|
# undef RETURNS_NONNULL
|
|
#endif
|
|
#define RETURNS_NONNULL __attribute__((returns_nonnull))
|
|
|
|
#ifdef NO_SANITIZE_ADDRESS
|
|
# undef NO_SANITIZE_ADDRESS
|
|
#endif
|
|
#define NO_SANITIZE_ADDRESS __attribute__((no_sanitize_address))
|
|
|
|
#ifdef NAKED
|
|
# undef NAKED
|
|
#endif
|
|
#define NAKED __attribute__((naked))
|
|
|
|
#ifdef DISALLOW
|
|
# undef DISALLOW
|
|
#endif
|
|
#ifdef __clang__
|
|
# define DISALLOW(message) __attribute__((diagnose_if(1, message, "error")))
|
|
#else
|
|
# define DISALLOW(message) __attribute__((error(message)))
|
|
#endif
|
|
|
|
// GCC doesn't have __has_feature but clang does
|
|
#ifndef __has_feature
|
|
# define __has_feature(...) 0
|
|
#endif
|
|
|
|
#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
|
|
# define HAS_ADDRESS_SANITIZER
|
|
# define ASAN_POISON_MEMORY_REGION(addr, size) __asan_poison_memory_region(addr, size)
|
|
# define ASAN_UNPOISON_MEMORY_REGION(addr, size) __asan_unpoison_memory_region(addr, size)
|
|
#else
|
|
# define ASAN_POISON_MEMORY_REGION(addr, size)
|
|
# define ASAN_UNPOISON_MEMORY_REGION(addr, size)
|
|
#endif
|
|
|
|
#ifndef __serenity__
|
|
# include <unistd.h>
|
|
# undef PAGE_SIZE
|
|
# define PAGE_SIZE sysconf(_SC_PAGESIZE)
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
ALWAYS_INLINE int count_trailing_zeroes_32(unsigned int val)
|
|
{
|
|
# if defined(__GNUC__) || defined(__clang__)
|
|
return __builtin_ctz(val);
|
|
# else
|
|
for (u8 i = 0; i < 32; ++i) {
|
|
if ((val >> i) & 1) {
|
|
return i;
|
|
}
|
|
}
|
|
return 0;
|
|
# endif
|
|
}
|
|
|
|
ALWAYS_INLINE int count_trailing_zeroes_32_safe(unsigned int val)
|
|
{
|
|
if (val == 0)
|
|
return 32;
|
|
return count_trailing_zeroes_32(val);
|
|
}
|
|
#endif
|
|
|
|
#ifdef AK_OS_BSD_GENERIC
|
|
# define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC
|
|
# define CLOCK_REALTIME_COARSE CLOCK_REALTIME
|
|
#endif
|