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/* 44 * Used by decompressor's startup_32() to allocate page tables for identity 45 * mapping of the 4G of RAM in 4-level paging mode: 46 * - 1 level4 table; 47 * - 1 level3 table; 48 * - 4 level2 table that maps everything with 2M pages; 49 * 50 * The additional level5 table needed for 5-level paging is allocated from 51 * trampoline_32bit memory. 52 */ 53# define BOOT_INIT_PGT_SIZE (6*4096) 54 55/* 56 * Total number of page tables kernel_add_identity_map() can allocate, 57 * including page tables consumed by startup_32(). 58 * 59 * Worst-case scenario: 60 * - 5-level paging needs 1 level5 table; 61 * - KASLR needs to map kernel, boot_params, cmdline and randomized kernel, 62 * assuming all of them cross 256T boundary: 63 * + 4*2 level4 table; 64 * + 4*2 level3 table; 65 * + 4*2 level2 table; 66 * - X86_VERBOSE_BOOTUP needs to map the first 2M (video RAM): 67 * + 1 level4 table; 68 * + 1 level3 table; 69 * + 1 level2 table; 70 * Total: 28 tables 71 * 72 * Add 4 spare table in case decompressor touches anything beyond what is 73 * accounted above. Warn if it happens. 74 */ 75# define BOOT_PGT_SIZE_WARN (28*4096) 76# define BOOT_PGT_SIZE (32*4096) 77 78#else /* !CONFIG_X86_64 */ 79# define BOOT_STACK_SIZE 0x1000 80#endif 81 82#ifndef __ASSEMBLY__ 83extern unsigned int output_len; 84extern const unsigned long kernel_text_size; 85extern const unsigned long kernel_total_size; 86 87unsigned long decompress_kernel(unsigned char *outbuf, unsigned long virt_addr, 88 void (*error)(char *x)); 89 90extern struct boot_params *boot_params_ptr; 91#endif 92 93#endif /* _ASM_X86_BOOT_H */ 94