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 /* 23 * Boot stub deals with identity mappings, physical and virtual addresses are 24 * the same, so override these defines. 25 * 26 * <asm/page.h> will not define them if they are already defined. 27 */ 28 #define __pa(x) ((unsigned long)(x)) 29 #define __va(x) ((void *)((unsigned long)(x))) 30 31 #include <linux/linkage.h> 32 #include <linux/screen_info.h> 33 #include <linux/elf.h> 34 #include <asm/page.h> 35 #include <asm/boot.h> 36 #include <asm/bootparam.h> 37 #include <asm/desc_defs.h> 38 39 #include "tdx.h" 40 41 #define BOOT_CTYPE_H 42 #include <linux/acpi.h> 43 44 #define BOOT_BOOT_H 45 #include "../ctype.h" 46 #include "../io.h" 47 48 #include "efi.h" 49 50 #ifdef CONFIG_X86_64 51 #define memptr long 52 #else 53 #define memptr unsigned 54 #endif 55 56 /* boot/compressed/vmlinux start and end markers */ 57 extern char _head[], _end[]; 58 59 /* misc.c */ 60 extern memptr free_mem_ptr; 61 extern memptr free_mem_end_ptr; 62 void *malloc(int size); 63 void free(void *where); 64 extern struct boot_params *boot_params; 65 void __putstr(const char *s); 66 void __puthex(unsigned long value); 67 #define error_putstr(__x) __putstr(__x) 68 #define error_puthex(__x) __puthex(__x) 69 70 #ifdef CONFIG_X86_VERBOSE_BOOTUP 71 72 #define debug_putstr(__x) __putstr(__x) 73 #define debug_puthex(__x) __puthex(__x) 74 #define debug_putaddr(__x) { \ 75 debug_putstr(#__x ": 0x"); \ 76 debug_puthex((unsigned long)(__x)); \ 77 debug_putstr("\n"); \ 78 } 79 80 #else 81 82 static inline void debug_putstr(const char *s) 83 { } 84 static inline void debug_puthex(unsigned long value) 85 { } 86 #define debug_putaddr(x) /* */ 87 88 #endif 89 90 /* cmdline.c */ 91 int cmdline_find_option(const char *option, char *buffer, int bufsize); 92 int cmdline_find_option_bool(const char *option); 93 94 struct mem_vector { 95 u64 start; 96 u64 size; 97 }; 98 99 #ifdef CONFIG_RANDOMIZE_BASE 100 /* kaslr.c */ 101 void choose_random_location(unsigned long input, 102 unsigned long input_size, 103 unsigned long *output, 104 unsigned long output_size, 105 unsigned long *virt_addr); 106 #else 107 static inline void choose_random_location(unsigned long input, 108 unsigned long input_size, 109 unsigned long *output, 110 unsigned long output_size, 111 unsigned long *virt_addr) 112 { 113 } 114 #endif 115 116 /* cpuflags.c */ 117 bool has_cpuflag(int flag); 118 119 #ifdef CONFIG_X86_64 120 extern int set_page_decrypted(unsigned long address); 121 extern int set_page_encrypted(unsigned long address); 122 extern int set_page_non_present(unsigned long address); 123 extern unsigned char _pgtable[]; 124 #endif 125 126 #ifdef CONFIG_EARLY_PRINTK 127 /* early_serial_console.c */ 128 extern int early_serial_base; 129 void console_init(void); 130 #else 131 static const int early_serial_base; 132 static inline void console_init(void) 133 { } 134 #endif 135 136 #ifdef CONFIG_AMD_MEM_ENCRYPT 137 void sev_enable(struct boot_params *bp); 138 void snp_check_features(void); 139 void sev_es_shutdown_ghcb(void); 140 extern bool sev_es_check_ghcb_fault(unsigned long address); 141 void snp_set_page_private(unsigned long paddr); 142 void snp_set_page_shared(unsigned long paddr); 143 void sev_prep_identity_maps(unsigned long top_level_pgt); 144 #else 145 static inline void sev_enable(struct boot_params *bp) 146 { 147 /* 148 * bp->cc_blob_address should only be set by boot/compressed kernel. 149 * Initialize it to 0 unconditionally (thus here in this stub too) to 150 * ensure that uninitialized values from buggy bootloaders aren't 151 * propagated. 152 */ 153 if (bp) 154 bp->cc_blob_address = 0; 155 } 156 static inline void snp_check_features(void) { } 157 static inline void sev_es_shutdown_ghcb(void) { } 158 static inline bool sev_es_check_ghcb_fault(unsigned long address) 159 { 160 return false; 161 } 162 static inline void snp_set_page_private(unsigned long paddr) { } 163 static inline void snp_set_page_shared(unsigned long paddr) { } 164 static inline void sev_prep_identity_maps(unsigned long top_level_pgt) { } 165 #endif 166 167 /* acpi.c */ 168 #ifdef CONFIG_ACPI 169 acpi_physical_address get_rsdp_addr(void); 170 #else 171 static inline acpi_physical_address get_rsdp_addr(void) { return 0; } 172 #endif 173 174 #if defined(CONFIG_RANDOMIZE_BASE) && defined(CONFIG_MEMORY_HOTREMOVE) && defined(CONFIG_ACPI) 175 extern struct mem_vector immovable_mem[MAX_NUMNODES*2]; 176 int count_immovable_mem_regions(void); 177 #else 178 static inline int count_immovable_mem_regions(void) { return 0; } 179 #endif 180 181 /* ident_map_64.c */ 182 extern unsigned int __pgtable_l5_enabled, pgdir_shift, ptrs_per_p4d; 183 extern void kernel_add_identity_map(unsigned long start, unsigned long end); 184 185 /* Used by PAGE_KERN* macros: */ 186 extern pteval_t __default_kernel_pte_mask; 187 188 /* idt_64.c */ 189 extern gate_desc boot_idt[BOOT_IDT_ENTRIES]; 190 extern struct desc_ptr boot_idt_desc; 191 192 #ifdef CONFIG_X86_64 193 void cleanup_exception_handling(void); 194 #else 195 static inline void cleanup_exception_handling(void) { } 196 #endif 197 198 /* IDT Entry Points */ 199 void boot_page_fault(void); 200 void boot_stage1_vc(void); 201 void boot_stage2_vc(void); 202 203 unsigned long sev_verify_cbit(unsigned long cr3); 204 205 enum efi_type { 206 EFI_TYPE_64, 207 EFI_TYPE_32, 208 EFI_TYPE_NONE, 209 }; 210 211 #ifdef CONFIG_EFI 212 /* helpers for early EFI config table access */ 213 enum efi_type efi_get_type(struct boot_params *bp); 214 unsigned long efi_get_system_table(struct boot_params *bp); 215 int efi_get_conf_table(struct boot_params *bp, unsigned long *cfg_tbl_pa, 216 unsigned int *cfg_tbl_len); 217 unsigned long efi_find_vendor_table(struct boot_params *bp, 218 unsigned long cfg_tbl_pa, 219 unsigned int cfg_tbl_len, 220 efi_guid_t guid); 221 #else 222 static inline enum efi_type efi_get_type(struct boot_params *bp) 223 { 224 return EFI_TYPE_NONE; 225 } 226 227 static inline unsigned long efi_get_system_table(struct boot_params *bp) 228 { 229 return 0; 230 } 231 232 static inline int efi_get_conf_table(struct boot_params *bp, 233 unsigned long *cfg_tbl_pa, 234 unsigned int *cfg_tbl_len) 235 { 236 return -ENOENT; 237 } 238 239 static inline unsigned long efi_find_vendor_table(struct boot_params *bp, 240 unsigned long cfg_tbl_pa, 241 unsigned int cfg_tbl_len, 242 efi_guid_t guid) 243 { 244 return 0; 245 } 246 #endif /* CONFIG_EFI */ 247 248 #ifdef CONFIG_UNACCEPTED_MEMORY 249 bool init_unaccepted_memory(void); 250 #else 251 static inline bool init_unaccepted_memory(void) { return false; } 252 #endif 253 254 /* Defined in EFI stub */ 255 extern struct efi_unaccepted_memory *unaccepted_table; 256 void accept_memory(phys_addr_t start, phys_addr_t end); 257 258 #endif /* BOOT_COMPRESSED_MISC_H */ 259