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/* 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 */