misc.h

  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 */
 57extern char _head[], _end[];
 58
 59/* misc.c */
 60extern memptr free_mem_ptr;
 61extern memptr free_mem_end_ptr;
 62extern int spurious_nmi_count;
 63void *malloc(int size);
 64void free(void *where);
 65void __putstr(const char *s);
 66void __puthex(unsigned long value);
 67void __putdec(unsigned long value);
 68#define error_putstr(__x)  __putstr(__x)
 69#define error_puthex(__x)  __puthex(__x)
 70#define error_putdec(__x)  __putdec(__x)
 71
 72#ifdef CONFIG_X86_VERBOSE_BOOTUP
 73
 74#define debug_putstr(__x)  __putstr(__x)
 75#define debug_puthex(__x)  __puthex(__x)
 76#define debug_putaddr(__x) { \
 77		debug_putstr(#__x ": 0x"); \
 78		debug_puthex((unsigned long)(__x)); \
 79		debug_putstr("\n"); \
 80	}
 81
 82#else
 83
 84static inline void debug_putstr(const char *s)
 85{ }
 86static inline void debug_puthex(unsigned long value)
 87{ }
 88#define debug_putaddr(x) /* */
 89
 90#endif
 91
 92/* cmdline.c */
 93int cmdline_find_option(const char *option, char *buffer, int bufsize);
 94int cmdline_find_option_bool(const char *option);
 95
 96struct mem_vector {
 97	u64 start;
 98	u64 size;
 99};
100
101#ifdef CONFIG_RANDOMIZE_BASE
102/* kaslr.c */
103void choose_random_location(unsigned long input,
104			    unsigned long input_size,
105			    unsigned long *output,
106			    unsigned long output_size,
107			    unsigned long *virt_addr);
108#else
109static inline void choose_random_location(unsigned long input,
110					  unsigned long input_size,
111					  unsigned long *output,
112					  unsigned long output_size,
113					  unsigned long *virt_addr)
114{
115}
116#endif
117
118/* cpuflags.c */
119bool has_cpuflag(int flag);
120
121#ifdef CONFIG_X86_64
122extern int set_page_decrypted(unsigned long address);
123extern int set_page_encrypted(unsigned long address);
124extern int set_page_non_present(unsigned long address);
125extern unsigned char _pgtable[];
126#endif
127
128#ifdef CONFIG_EARLY_PRINTK
129/* early_serial_console.c */
130extern int early_serial_base;
131void console_init(void);
132#else
133static const int early_serial_base;
134static inline void console_init(void)
135{ }
136#endif
137
138#ifdef CONFIG_AMD_MEM_ENCRYPT
139struct es_em_ctxt;
140struct insn;
141
142void sev_enable(struct boot_params *bp);
143void snp_check_features(void);
144void sev_es_shutdown_ghcb(void);
145extern bool sev_es_check_ghcb_fault(unsigned long address);
146void snp_set_page_private(unsigned long paddr);
147void snp_set_page_shared(unsigned long paddr);
148void sev_prep_identity_maps(unsigned long top_level_pgt);
149
150enum es_result vc_decode_insn(struct es_em_ctxt *ctxt);
151bool insn_has_rep_prefix(struct insn *insn);
152void sev_insn_decode_init(void);
153bool early_setup_ghcb(void);
154#else
155static inline void snp_check_features(void) { }
156static inline void sev_es_shutdown_ghcb(void) { }
157static inline bool sev_es_check_ghcb_fault(unsigned long address)
158{
159	return false;
160}
161static inline void snp_set_page_private(unsigned long paddr) { }
162static inline void snp_set_page_shared(unsigned long paddr) { }
163static inline void sev_prep_identity_maps(unsigned long top_level_pgt) { }
164#endif
165
166/* acpi.c */
167#ifdef CONFIG_ACPI
168acpi_physical_address get_rsdp_addr(void);
169#else
170static inline acpi_physical_address get_rsdp_addr(void) { return 0; }
171#endif
172
173#if defined(CONFIG_RANDOMIZE_BASE) && defined(CONFIG_MEMORY_HOTREMOVE) && defined(CONFIG_ACPI)
174extern struct mem_vector immovable_mem[MAX_NUMNODES*2];
175int count_immovable_mem_regions(void);
176#else
177static inline int count_immovable_mem_regions(void) { return 0; }
178#endif
179
180/* ident_map_64.c */
181extern unsigned int __pgtable_l5_enabled, pgdir_shift, ptrs_per_p4d;
182extern void kernel_add_identity_map(unsigned long start, unsigned long end);
183
184/* Used by PAGE_KERN* macros: */
185extern pteval_t __default_kernel_pte_mask;
186
187/* idt_64.c */
188extern gate_desc boot_idt[BOOT_IDT_ENTRIES];
189extern struct desc_ptr boot_idt_desc;
190
191#ifdef CONFIG_X86_64
192void cleanup_exception_handling(void);
193#else
194static inline void cleanup_exception_handling(void) { }
195#endif
196
197/* IDT Entry Points */
198void boot_page_fault(void);
199void boot_nmi_trap(void);
200void boot_stage1_vc(void);
201void boot_stage2_vc(void);
202
203unsigned long sev_verify_cbit(unsigned long cr3);
204
205enum 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 */
213enum efi_type efi_get_type(struct boot_params *bp);
214unsigned long efi_get_system_table(struct boot_params *bp);
215int efi_get_conf_table(struct boot_params *bp, unsigned long *cfg_tbl_pa,
216		       unsigned int *cfg_tbl_len);
217unsigned 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
222static inline enum efi_type efi_get_type(struct boot_params *bp)
223{
224	return EFI_TYPE_NONE;
225}
226
227static inline unsigned long efi_get_system_table(struct boot_params *bp)
228{
229	return 0;
230}
231
232static 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
239static 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
249bool init_unaccepted_memory(void);
250#else
251static inline bool init_unaccepted_memory(void) { return false; }
252#endif
253
254/* Defined in EFI stub */
255extern struct efi_unaccepted_memory *unaccepted_table;
256void accept_memory(phys_addr_t start, unsigned long size);
257
258#endif /* BOOT_COMPRESSED_MISC_H */