arch/x86/include/asm/boot.h

   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 */