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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/x86/include/asm/boot.h | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/x86/include/asm/boot.h')
-rw-r--r-- | arch/x86/include/asm/boot.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/arch/x86/include/asm/boot.h b/arch/x86/include/asm/boot.h new file mode 100644 index 000000000..215d37f7d --- /dev/null +++ b/arch/x86/include/asm/boot.h @@ -0,0 +1,82 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_BOOT_H +#define _ASM_X86_BOOT_H + + +#include <asm/pgtable_types.h> +#include <uapi/asm/boot.h> + +/* Physical address where kernel should be loaded. */ +#define LOAD_PHYSICAL_ADDR ((CONFIG_PHYSICAL_START \ + + (CONFIG_PHYSICAL_ALIGN - 1)) \ + & ~(CONFIG_PHYSICAL_ALIGN - 1)) + +/* Minimum kernel alignment, as a power of two */ +#ifdef CONFIG_X86_64 +# define MIN_KERNEL_ALIGN_LG2 PMD_SHIFT +#else +# define MIN_KERNEL_ALIGN_LG2 (PAGE_SHIFT + THREAD_SIZE_ORDER) +#endif +#define MIN_KERNEL_ALIGN (_AC(1, UL) << MIN_KERNEL_ALIGN_LG2) + +#if (CONFIG_PHYSICAL_ALIGN & (CONFIG_PHYSICAL_ALIGN-1)) || \ + (CONFIG_PHYSICAL_ALIGN < MIN_KERNEL_ALIGN) +# error "Invalid value for CONFIG_PHYSICAL_ALIGN" +#endif + +#if defined(CONFIG_KERNEL_BZIP2) +# define BOOT_HEAP_SIZE 0x400000 +#elif defined(CONFIG_KERNEL_ZSTD) +/* + * Zstd needs to allocate the ZSTD_DCtx in order to decompress the kernel. + * The ZSTD_DCtx is ~160KB, so set the heap size to 192KB because it is a + * round number and to allow some slack. + */ +# define BOOT_HEAP_SIZE 0x30000 +#else +# define BOOT_HEAP_SIZE 0x10000 +#endif + +#ifdef CONFIG_X86_64 +# define BOOT_STACK_SIZE 0x4000 + +/* + * Used by decompressor's startup_32() to allocate page tables for identity + * mapping of the 4G of RAM in 4-level paging mode: + * - 1 level4 table; + * - 1 level3 table; + * - 4 level2 table that maps everything with 2M pages; + * + * The additional level5 table needed for 5-level paging is allocated from + * trampoline_32bit memory. + */ +# define BOOT_INIT_PGT_SIZE (6*4096) + +/* + * Total number of page tables kernel_add_identity_map() can allocate, + * including page tables consumed by startup_32(). + * + * Worst-case scenario: + * - 5-level paging needs 1 level5 table; + * - KASLR needs to map kernel, boot_params, cmdline and randomized kernel, + * assuming all of them cross 256T boundary: + * + 4*2 level4 table; + * + 4*2 level3 table; + * + 4*2 level2 table; + * - X86_VERBOSE_BOOTUP needs to map the first 2M (video RAM): + * + 1 level4 table; + * + 1 level3 table; + * + 1 level2 table; + * Total: 28 tables + * + * Add 4 spare table in case decompressor touches anything beyond what is + * accounted above. Warn if it happens. + */ +# define BOOT_PGT_SIZE_WARN (28*4096) +# define BOOT_PGT_SIZE (32*4096) + +#else /* !CONFIG_X86_64 */ +# define BOOT_STACK_SIZE 0x1000 +#endif + +#endif /* _ASM_X86_BOOT_H */ |