linux/arch/x86/include/asm/boot.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_BOOT_H
   3#define _ASM_X86_BOOT_H
   4
   5
   6#include <asm/pgtable_types.h>
   7#include <uapi/asm/boot.h>
   8
   9/* Physical address where kernel should be loaded. */
  10#define LOAD_PHYSICAL_ADDR ((CONFIG_PHYSICAL_START \
  11                                + (CONFIG_PHYSICAL_ALIGN - 1)) \
  12                                & ~(CONFIG_PHYSICAL_ALIGN - 1))
  13
  14/* Minimum kernel alignment, as a power of two */
  15#ifdef CONFIG_X86_64
  16# define MIN_KERNEL_ALIGN_LG2   PMD_SHIFT
  17#else
  18# define MIN_KERNEL_ALIGN_LG2   (PAGE_SHIFT + THREAD_SIZE_ORDER)
  19#endif
  20#define MIN_KERNEL_ALIGN        (_AC(1, UL) << MIN_KERNEL_ALIGN_LG2)
  21
  22#if (CONFIG_PHYSICAL_ALIGN & (CONFIG_PHYSICAL_ALIGN-1)) || \
  23        (CONFIG_PHYSICAL_ALIGN < MIN_KERNEL_ALIGN)
  24# error "Invalid value for CONFIG_PHYSICAL_ALIGN"
  25#endif
  26
  27#if defined(CONFIG_KERNEL_BZIP2)
  28# define BOOT_HEAP_SIZE         0x400000
  29#elif defined(CONFIG_KERNEL_ZSTD)
  30/*
  31 * Zstd needs to allocate the ZSTD_DCtx in order to decompress the kernel.
  32 * The ZSTD_DCtx is ~160KB, so set the heap size to 192KB because it is a
  33 * round number and to allow some slack.
  34 */
  35# define BOOT_HEAP_SIZE          0x30000
  36#else
  37# define BOOT_HEAP_SIZE          0x10000
  38#endif
  39
  40#ifdef CONFIG_X86_64
  41# define BOOT_STACK_SIZE        0x4000
  42
  43# define BOOT_INIT_PGT_SIZE     (6*4096)
  44# ifdef CONFIG_RANDOMIZE_BASE
  45/*
  46 * Assuming all cross the 512GB boundary:
  47 * 1 page for level4
  48 * (2+2)*4 pages for kernel, param, cmd_line, and randomized kernel
  49 * 2 pages for first 2M (video RAM: CONFIG_X86_VERBOSE_BOOTUP).
  50 * Total is 19 pages.
  51 */
  52#  ifdef CONFIG_X86_VERBOSE_BOOTUP
  53#   define BOOT_PGT_SIZE        (19*4096)
  54#  else /* !CONFIG_X86_VERBOSE_BOOTUP */
  55#   define BOOT_PGT_SIZE        (17*4096)
  56#  endif
  57# else /* !CONFIG_RANDOMIZE_BASE */
  58#  define BOOT_PGT_SIZE         BOOT_INIT_PGT_SIZE
  59# endif
  60
  61#else /* !CONFIG_X86_64 */
  62# define BOOT_STACK_SIZE        0x1000
  63#endif
  64
  65#endif /* _ASM_X86_BOOT_H */
  66