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 sev_enable(struct boot_params *bp)
156{
157 /*
158 * bp->cc_blob_address should only be set by boot/compressed kernel.
159 * Initialize it to 0 unconditionally (thus here in this stub too) to
160 * ensure that uninitialized values from buggy bootloaders aren't
161 * propagated.
162 */
163 if (bp)
164 bp->cc_blob_address = 0;
165}
166static inline void snp_check_features(void) { }
167static inline void sev_es_shutdown_ghcb(void) { }
168static inline bool sev_es_check_ghcb_fault(unsigned long address)
169{
170 return false;
171}
172static inline void snp_set_page_private(unsigned long paddr) { }
173static inline void snp_set_page_shared(unsigned long paddr) { }
174static inline void sev_prep_identity_maps(unsigned long top_level_pgt) { }
175#endif
176
177/* acpi.c */
178#ifdef CONFIG_ACPI
179acpi_physical_address get_rsdp_addr(void);
180#else
181static inline acpi_physical_address get_rsdp_addr(void) { return 0; }
182#endif
183
184#if defined(CONFIG_RANDOMIZE_BASE) && defined(CONFIG_MEMORY_HOTREMOVE) && defined(CONFIG_ACPI)
185extern struct mem_vector immovable_mem[MAX_NUMNODES*2];
186int count_immovable_mem_regions(void);
187#else
188static inline int count_immovable_mem_regions(void) { return 0; }
189#endif
190
191/* ident_map_64.c */
192extern unsigned int __pgtable_l5_enabled, pgdir_shift, ptrs_per_p4d;
193extern void kernel_add_identity_map(unsigned long start, unsigned long end);
194
195/* Used by PAGE_KERN* macros: */
196extern pteval_t __default_kernel_pte_mask;
197
198/* idt_64.c */
199extern gate_desc boot_idt[BOOT_IDT_ENTRIES];
200extern struct desc_ptr boot_idt_desc;
201
202#ifdef CONFIG_X86_64
203void cleanup_exception_handling(void);
204#else
205static inline void cleanup_exception_handling(void) { }
206#endif
207
208/* IDT Entry Points */
209void boot_page_fault(void);
210void boot_nmi_trap(void);
211void boot_stage1_vc(void);
212void boot_stage2_vc(void);
213
214unsigned long sev_verify_cbit(unsigned long cr3);
215
216enum efi_type {
217 EFI_TYPE_64,
218 EFI_TYPE_32,
219 EFI_TYPE_NONE,
220};
221
222#ifdef CONFIG_EFI
223/* helpers for early EFI config table access */
224enum efi_type efi_get_type(struct boot_params *bp);
225unsigned long efi_get_system_table(struct boot_params *bp);
226int efi_get_conf_table(struct boot_params *bp, unsigned long *cfg_tbl_pa,
227 unsigned int *cfg_tbl_len);
228unsigned long efi_find_vendor_table(struct boot_params *bp,
229 unsigned long cfg_tbl_pa,
230 unsigned int cfg_tbl_len,
231 efi_guid_t guid);
232#else
233static inline enum efi_type efi_get_type(struct boot_params *bp)
234{
235 return EFI_TYPE_NONE;
236}
237
238static inline unsigned long efi_get_system_table(struct boot_params *bp)
239{
240 return 0;
241}
242
243static inline int efi_get_conf_table(struct boot_params *bp,
244 unsigned long *cfg_tbl_pa,
245 unsigned int *cfg_tbl_len)
246{
247 return -ENOENT;
248}
249
250static inline unsigned long efi_find_vendor_table(struct boot_params *bp,
251 unsigned long cfg_tbl_pa,
252 unsigned int cfg_tbl_len,
253 efi_guid_t guid)
254{
255 return 0;
256}
257#endif /* CONFIG_EFI */
258
259#ifdef CONFIG_UNACCEPTED_MEMORY
260bool init_unaccepted_memory(void);
261#else
262static inline bool init_unaccepted_memory(void) { return false; }
263#endif
264
265/* Defined in EFI stub */
266extern struct efi_unaccepted_memory *unaccepted_table;
267void accept_memory(phys_addr_t start, unsigned long size);
268
269#endif /* BOOT_COMPRESSED_MISC_H */
270

source code of linux/arch/x86/boot/compressed/misc.h