tjh.dev
Linux kernel mirror (for testing)
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linux
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 */
48extern char _head[], _end[];
49
50/* misc.c */
51extern memptr free_mem_ptr;
52extern memptr free_mem_end_ptr;
53void *malloc(int size);
54void free(void *where);
55extern struct boot_params *boot_params;
56void __putstr(const char *s);
57void __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
73static inline void debug_putstr(const char *s)
74{ }
75static inline void debug_puthex(unsigned long value)
76{ }
77#define debug_putaddr(x) /* */
78
79#endif
80
81/* cmdline.c */
82int cmdline_find_option(const char *option, char *buffer, int bufsize);
83int cmdline_find_option_bool(const char *option);
84
85struct mem_vector {
86 u64 start;
87 u64 size;
88};
89
90#ifdef CONFIG_RANDOMIZE_BASE
91/* kaslr.c */
92void 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
98static 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 */
108bool has_cpuflag(int flag);
109
110#ifdef CONFIG_X86_64
111extern int set_page_decrypted(unsigned long address);
112extern int set_page_encrypted(unsigned long address);
113extern int set_page_non_present(unsigned long address);
114extern unsigned char _pgtable[];
115#endif
116
117#ifdef CONFIG_EARLY_PRINTK
118/* early_serial_console.c */
119extern int early_serial_base;
120void console_init(void);
121#else
122static const int early_serial_base;
123static inline void console_init(void)
124{ }
125#endif
126
127#ifdef CONFIG_AMD_MEM_ENCRYPT
128void sev_enable(struct boot_params *bp);
129void sev_es_shutdown_ghcb(void);
130extern bool sev_es_check_ghcb_fault(unsigned long address);
131void snp_set_page_private(unsigned long paddr);
132void snp_set_page_shared(unsigned long paddr);
133void sev_prep_identity_maps(unsigned long top_level_pgt);
134#else
135static inline void sev_enable(struct boot_params *bp)
136{
137 /*
138 * bp->cc_blob_address should only be set by boot/compressed kernel.
139 * Initialize it to 0 unconditionally (thus here in this stub too) to
140 * ensure that uninitialized values from buggy bootloaders aren't
141 * propagated.
142 */
143 if (bp)
144 bp->cc_blob_address = 0;
145}
146static inline void sev_es_shutdown_ghcb(void) { }
147static inline bool sev_es_check_ghcb_fault(unsigned long address)
148{
149 return false;
150}
151static inline void snp_set_page_private(unsigned long paddr) { }
152static inline void snp_set_page_shared(unsigned long paddr) { }
153static inline void sev_prep_identity_maps(unsigned long top_level_pgt) { }
154#endif
155
156/* acpi.c */
157#ifdef CONFIG_ACPI
158acpi_physical_address get_rsdp_addr(void);
159#else
160static inline acpi_physical_address get_rsdp_addr(void) { return 0; }
161#endif
162
163#if defined(CONFIG_RANDOMIZE_BASE) && defined(CONFIG_MEMORY_HOTREMOVE) && defined(CONFIG_ACPI)
164extern struct mem_vector immovable_mem[MAX_NUMNODES*2];
165int count_immovable_mem_regions(void);
166#else
167static inline int count_immovable_mem_regions(void) { return 0; }
168#endif
169
170/* ident_map_64.c */
171#ifdef CONFIG_X86_5LEVEL
172extern unsigned int __pgtable_l5_enabled, pgdir_shift, ptrs_per_p4d;
173#endif
174extern void kernel_add_identity_map(unsigned long start, unsigned long end);
175
176/* Used by PAGE_KERN* macros: */
177extern pteval_t __default_kernel_pte_mask;
178
179/* idt_64.c */
180extern gate_desc boot_idt[BOOT_IDT_ENTRIES];
181extern struct desc_ptr boot_idt_desc;
182
183#ifdef CONFIG_X86_64
184void cleanup_exception_handling(void);
185#else
186static inline void cleanup_exception_handling(void) { }
187#endif
188
189/* IDT Entry Points */
190void boot_page_fault(void);
191void boot_stage1_vc(void);
192void boot_stage2_vc(void);
193
194unsigned long sev_verify_cbit(unsigned long cr3);
195
196enum efi_type {
197 EFI_TYPE_64,
198 EFI_TYPE_32,
199 EFI_TYPE_NONE,
200};
201
202#ifdef CONFIG_EFI
203/* helpers for early EFI config table access */
204enum efi_type efi_get_type(struct boot_params *bp);
205unsigned long efi_get_system_table(struct boot_params *bp);
206int efi_get_conf_table(struct boot_params *bp, unsigned long *cfg_tbl_pa,
207 unsigned int *cfg_tbl_len);
208unsigned long efi_find_vendor_table(struct boot_params *bp,
209 unsigned long cfg_tbl_pa,
210 unsigned int cfg_tbl_len,
211 efi_guid_t guid);
212#else
213static inline enum efi_type efi_get_type(struct boot_params *bp)
214{
215 return EFI_TYPE_NONE;
216}
217
218static inline unsigned long efi_get_system_table(struct boot_params *bp)
219{
220 return 0;
221}
222
223static inline int efi_get_conf_table(struct boot_params *bp,
224 unsigned long *cfg_tbl_pa,
225 unsigned int *cfg_tbl_len)
226{
227 return -ENOENT;
228}
229
230static inline unsigned long efi_find_vendor_table(struct boot_params *bp,
231 unsigned long cfg_tbl_pa,
232 unsigned int cfg_tbl_len,
233 efi_guid_t guid)
234{
235 return 0;
236}
237#endif /* CONFIG_EFI */
238
239#endif /* BOOT_COMPRESSED_MISC_H */