1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef BOOT_COMPRESSED_MISC_H 3 #define BOOT_COMPRESSED_MISC_H 4 5 /* 6 * Special hack: we have to be careful, because no indirections are allowed here, 7 * and paravirt_ops is a kind of one. As it will only run in baremetal anyway, 8 * we just keep it from happening. (This list needs to be extended when new 9 * paravirt and debugging variants are added.) 10 */ 11 #undef CONFIG_PARAVIRT 12 #undef CONFIG_PARAVIRT_XXL 13 #undef CONFIG_PARAVIRT_SPINLOCKS 14 #undef CONFIG_KASAN 15 #undef CONFIG_KASAN_GENERIC 16 17 #define __NO_FORTIFY 18 19 /* cpu_feature_enabled() cannot be used this early */ 20 #define USE_EARLY_PGTABLE_L5 21 22 #include <linux/linkage.h> 23 #include <linux/screen_info.h> 24 #include <linux/elf.h> 25 #include <asm/page.h> 26 #include <asm/boot.h> 27 #include <asm/bootparam.h> 28 #include <asm/desc_defs.h> 29 30 #include "tdx.h" 31 32 #define BOOT_CTYPE_H 33 #include <linux/acpi.h> 34 35 #define BOOT_BOOT_H 36 #include "../ctype.h" 37 #include "../io.h" 38 39 #include "efi.h" 40 41 #ifdef CONFIG_X86_64 42 #define memptr long 43 #else 44 #define memptr unsigned 45 #endif 46 47 /* boot/compressed/vmlinux start and end markers */ 48 extern char _head[], _end[]; 49 50 /* misc.c */ 51 extern memptr free_mem_ptr; 52 extern memptr free_mem_end_ptr; 53 void *malloc(int size); 54 void free(void *where); 55 extern struct boot_params *boot_params; 56 void __putstr(const char *s); 57 void __puthex(unsigned long value); 58 #define error_putstr(__x) __putstr(__x) 59 #define error_puthex(__x) __puthex(__x) 60 61 #ifdef CONFIG_X86_VERBOSE_BOOTUP 62 63 #define debug_putstr(__x) __putstr(__x) 64 #define debug_puthex(__x) __puthex(__x) 65 #define debug_putaddr(__x) { \ 66 debug_putstr(#__x ": 0x"); \ 67 debug_puthex((unsigned long)(__x)); \ 68 debug_putstr("\n"); \ 69 } 70 71 #else 72 73 static inline void debug_putstr(const char *s) 74 { } 75 static inline void debug_puthex(unsigned long value) 76 { } 77 #define debug_putaddr(x) /* */ 78 79 #endif 80 81 /* cmdline.c */ 82 int cmdline_find_option(const char *option, char *buffer, int bufsize); 83 int cmdline_find_option_bool(const char *option); 84 85 struct mem_vector { 86 u64 start; 87 u64 size; 88 }; 89 90 #ifdef CONFIG_RANDOMIZE_BASE 91 /* kaslr.c */ 92 void choose_random_location(unsigned long input, 93 unsigned long input_size, 94 unsigned long *output, 95 unsigned long output_size, 96 unsigned long *virt_addr); 97 #else 98 static inline void choose_random_location(unsigned long input, 99 unsigned long input_size, 100 unsigned long *output, 101 unsigned long output_size, 102 unsigned long *virt_addr) 103 { 104 } 105 #endif 106 107 /* cpuflags.c */ 108 bool has_cpuflag(int flag); 109 110 #ifdef CONFIG_X86_64 111 extern int set_page_decrypted(unsigned long address); 112 extern int set_page_encrypted(unsigned long address); 113 extern int set_page_non_present(unsigned long address); 114 extern unsigned char _pgtable[]; 115 #endif 116 117 #ifdef CONFIG_EARLY_PRINTK 118 /* early_serial_console.c */ 119 extern int early_serial_base; 120 void console_init(void); 121 #else 122 static const int early_serial_base; 123 static inline void console_init(void) 124 { } 125 #endif 126 127 #ifdef CONFIG_AMD_MEM_ENCRYPT 128 void sev_enable(struct boot_params *bp); 129 void snp_check_features(void); 130 void sev_es_shutdown_ghcb(void); 131 extern bool sev_es_check_ghcb_fault(unsigned long address); 132 void snp_set_page_private(unsigned long paddr); 133 void snp_set_page_shared(unsigned long paddr); 134 void sev_prep_identity_maps(unsigned long top_level_pgt); 135 #else 136 static inline void sev_enable(struct boot_params *bp) 137 { 138 /* 139 * bp->cc_blob_address should only be set by boot/compressed kernel. 140 * Initialize it to 0 unconditionally (thus here in this stub too) to 141 * ensure that uninitialized values from buggy bootloaders aren't 142 * propagated. 143 */ 144 if (bp) 145 bp->cc_blob_address = 0; 146 } 147 static inline void snp_check_features(void) { } 148 static inline void sev_es_shutdown_ghcb(void) { } 149 static inline bool sev_es_check_ghcb_fault(unsigned long address) 150 { 151 return false; 152 } 153 static inline void snp_set_page_private(unsigned long paddr) { } 154 static inline void snp_set_page_shared(unsigned long paddr) { } 155 static inline void sev_prep_identity_maps(unsigned long top_level_pgt) { } 156 #endif 157 158 /* acpi.c */ 159 #ifdef CONFIG_ACPI 160 acpi_physical_address get_rsdp_addr(void); 161 #else 162 static inline acpi_physical_address get_rsdp_addr(void) { return 0; } 163 #endif 164 165 #if defined(CONFIG_RANDOMIZE_BASE) && defined(CONFIG_MEMORY_HOTREMOVE) && defined(CONFIG_ACPI) 166 extern struct mem_vector immovable_mem[MAX_NUMNODES*2]; 167 int count_immovable_mem_regions(void); 168 #else 169 static inline int count_immovable_mem_regions(void) { return 0; } 170 #endif 171 172 /* ident_map_64.c */ 173 #ifdef CONFIG_X86_5LEVEL 174 extern unsigned int __pgtable_l5_enabled, pgdir_shift, ptrs_per_p4d; 175 #endif 176 extern void kernel_add_identity_map(unsigned long start, unsigned long end); 177 178 /* Used by PAGE_KERN* macros: */ 179 extern pteval_t __default_kernel_pte_mask; 180 181 /* idt_64.c */ 182 extern gate_desc boot_idt[BOOT_IDT_ENTRIES]; 183 extern struct desc_ptr boot_idt_desc; 184 185 #ifdef CONFIG_X86_64 186 void cleanup_exception_handling(void); 187 #else 188 static inline void cleanup_exception_handling(void) { } 189 #endif 190 191 /* IDT Entry Points */ 192 void boot_page_fault(void); 193 void boot_stage1_vc(void); 194 void boot_stage2_vc(void); 195 196 unsigned long sev_verify_cbit(unsigned long cr3); 197 198 enum efi_type { 199 EFI_TYPE_64, 200 EFI_TYPE_32, 201 EFI_TYPE_NONE, 202 }; 203 204 #ifdef CONFIG_EFI 205 /* helpers for early EFI config table access */ 206 enum efi_type efi_get_type(struct boot_params *bp); 207 unsigned long efi_get_system_table(struct boot_params *bp); 208 int efi_get_conf_table(struct boot_params *bp, unsigned long *cfg_tbl_pa, 209 unsigned int *cfg_tbl_len); 210 unsigned long efi_find_vendor_table(struct boot_params *bp, 211 unsigned long cfg_tbl_pa, 212 unsigned int cfg_tbl_len, 213 efi_guid_t guid); 214 #else 215 static inline enum efi_type efi_get_type(struct boot_params *bp) 216 { 217 return EFI_TYPE_NONE; 218 } 219 220 static inline unsigned long efi_get_system_table(struct boot_params *bp) 221 { 222 return 0; 223 } 224 225 static inline int efi_get_conf_table(struct boot_params *bp, 226 unsigned long *cfg_tbl_pa, 227 unsigned int *cfg_tbl_len) 228 { 229 return -ENOENT; 230 } 231 232 static inline unsigned long efi_find_vendor_table(struct boot_params *bp, 233 unsigned long cfg_tbl_pa, 234 unsigned int cfg_tbl_len, 235 efi_guid_t guid) 236 { 237 return 0; 238 } 239 #endif /* CONFIG_EFI */ 240 241 #endif /* BOOT_COMPRESSED_MISC_H */ 242