summaryrefslogtreecommitdiffstats
path: root/src/boot/efi/util.h
blob: 0306e3281034cbea5ebb58a7384aa36f811ba860 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once

#include "efi.h"
#include "log.h"
#include "proto/file-io.h"
#include "string-util-fundamental.h"

/* This is provided by the linker. */
extern uint8_t __executable_start[];

static inline void free(void *p) {
        if (!p)
                return;

        /* Debugging an invalid free requires trace logging to find the call site or a debugger attached. For
         * release builds it is not worth the bother to even warn when we cannot even print a call stack. */
#ifdef EFI_DEBUG
        assert_se(BS->FreePool(p) == EFI_SUCCESS);
#else
        (void) BS->FreePool(p);
#endif
}

static inline void freep(void *p) {
        free(*(void **) p);
}

#define _cleanup_free_ _cleanup_(freep)

_malloc_ _alloc_(1) _returns_nonnull_ _warn_unused_result_
void *xmalloc(size_t size);

_malloc_ _alloc_(1, 2) _returns_nonnull_ _warn_unused_result_
static inline void *xmalloc_multiply(size_t n, size_t size) {
        assert_se(!__builtin_mul_overflow(size, n, &size));
        return xmalloc(size);
}

/* Use malloc attribute as this never returns p like userspace realloc. */
_malloc_ _alloc_(3) _returns_nonnull_ _warn_unused_result_
static inline void *xrealloc(void *p, size_t old_size, size_t new_size) {
        void *t = xmalloc(new_size);
        new_size = MIN(old_size, new_size);
        if (new_size > 0)
                memcpy(t, p, new_size);
        free(p);
        return t;
}

_malloc_ _alloc_(2) _returns_nonnull_ _warn_unused_result_
static inline void* xmemdup(const void *p, size_t l) {
        return memcpy(xmalloc(l), p, l);
}

#define xnew(type, n) ((type *) xmalloc_multiply((n), sizeof(type)))

typedef struct {
        EFI_PHYSICAL_ADDRESS addr;
        size_t n_pages;
} Pages;

static inline void cleanup_pages(Pages *p) {
        if (p->n_pages == 0)
                return;
#ifdef EFI_DEBUG
        assert_se(BS->FreePages(p->addr, p->n_pages) == EFI_SUCCESS);
#else
        (void) BS->FreePages(p->addr, p->n_pages);
#endif
}

#define _cleanup_pages_ _cleanup_(cleanup_pages)

static inline Pages xmalloc_pages(
                EFI_ALLOCATE_TYPE type, EFI_MEMORY_TYPE memory_type, size_t n_pages, EFI_PHYSICAL_ADDRESS addr) {
        assert_se(BS->AllocatePages(type, memory_type, n_pages, &addr) == EFI_SUCCESS);
        return (Pages) {
                .addr = addr,
                .n_pages = n_pages,
        };
}

EFI_STATUS efivar_set(const EFI_GUID *vendor, const char16_t *name, const char16_t *value, uint32_t flags);
EFI_STATUS efivar_set_raw(const EFI_GUID *vendor, const char16_t *name, const void *buf, size_t size, uint32_t flags);
EFI_STATUS efivar_set_uint_string(const EFI_GUID *vendor, const char16_t *name, size_t i, uint32_t flags);
EFI_STATUS efivar_set_uint32_le(const EFI_GUID *vendor, const char16_t *NAME, uint32_t value, uint32_t flags);
EFI_STATUS efivar_set_uint64_le(const EFI_GUID *vendor, const char16_t *name, uint64_t value, uint32_t flags);
void efivar_set_time_usec(const EFI_GUID *vendor, const char16_t *name, uint64_t usec);

EFI_STATUS efivar_unset(const EFI_GUID *vendor, const char16_t *name, uint32_t flags);

EFI_STATUS efivar_get(const EFI_GUID *vendor, const char16_t *name, char16_t **ret);
EFI_STATUS efivar_get_raw(const EFI_GUID *vendor, const char16_t *name, char **ret, size_t *ret_size);
EFI_STATUS efivar_get_uint_string(const EFI_GUID *vendor, const char16_t *name, size_t *ret);
EFI_STATUS efivar_get_uint32_le(const EFI_GUID *vendor, const char16_t *name, uint32_t *ret);
EFI_STATUS efivar_get_uint64_le(const EFI_GUID *vendor, const char16_t *name, uint64_t *ret);
EFI_STATUS efivar_get_boolean_u8(const EFI_GUID *vendor, const char16_t *name, bool *ret);

void convert_efi_path(char16_t *path);
char16_t *xstr8_to_path(const char *stra);
char16_t *mangle_stub_cmdline(char16_t *cmdline);

EFI_STATUS chunked_read(EFI_FILE *file, size_t *size, void *buf);
EFI_STATUS file_read(EFI_FILE *dir, const char16_t *name, size_t off, size_t size, char **content, size_t *content_size);

static inline void file_closep(EFI_FILE **handle) {
        if (!*handle)
                return;

        (*handle)->Close(*handle);
}

static inline void unload_imagep(EFI_HANDLE *image) {
        if (*image)
                (void) BS->UnloadImage(*image);
}

/*
 * Allocated random UUID, intended to be shared across tools that implement
 * the (ESP)\loader\entries\<vendor>-<revision>.conf convention and the
 * associated EFI variables.
 */
#define LOADER_GUID \
        { 0x4a67b082, 0x0a4c, 0x41cf, { 0xb6, 0xc7, 0x44, 0x0b, 0x29, 0xbb, 0x8c, 0x4f } }

/* Note that GUID is evaluated multiple times! */
#define GUID_FORMAT_STR "%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X"
#define GUID_FORMAT_VAL(g) (g).Data1, (g).Data2, (g).Data3, (g).Data4[0], (g).Data4[1], \
        (g).Data4[2], (g).Data4[3], (g).Data4[4], (g).Data4[5], (g).Data4[6], (g).Data4[7]

void print_at(size_t x, size_t y, size_t attr, const char16_t *str);
void clear_screen(size_t attr);

typedef int (*compare_pointer_func_t)(const void *a, const void *b);
void sort_pointer_array(void **array, size_t n_members, compare_pointer_func_t compare);

EFI_STATUS get_file_info(EFI_FILE *handle, EFI_FILE_INFO **ret, size_t *ret_size);
EFI_STATUS readdir(EFI_FILE *handle, EFI_FILE_INFO **buffer, size_t *buffer_size);

bool is_ascii(const char16_t *f);

char16_t **strv_free(char16_t **l);

static inline void strv_freep(char16_t ***p) {
        strv_free(*p);
}

EFI_STATUS open_directory(EFI_FILE *root_dir, const char16_t *path, EFI_FILE **ret);

/* Conversion between EFI_PHYSICAL_ADDRESS and pointers is not obvious. The former is always 64-bit, even on
 * 32-bit archs. And gcc complains if we cast a pointer to an integer of a different size. Hence let's do the
 * conversion indirectly: first into uintptr_t and then extended to EFI_PHYSICAL_ADDRESS. */
static inline EFI_PHYSICAL_ADDRESS POINTER_TO_PHYSICAL_ADDRESS(const void *p) {
        return (EFI_PHYSICAL_ADDRESS) (uintptr_t) p;
}

static inline void *PHYSICAL_ADDRESS_TO_POINTER(EFI_PHYSICAL_ADDRESS addr) {
        /* On 32-bit systems the address might not be convertible (as pointers are 32-bit but
         * EFI_PHYSICAL_ADDRESS 64-bit) */
        assert(addr <= UINTPTR_MAX);
        return (void *) (uintptr_t) addr;
}

uint64_t get_os_indications_supported(void);

/* If EFI_DEBUG, print our name and version and also report the address of the image base so a debugger can
 * be attached. See debug-sd-boot.sh for how this can be done. */
void notify_debugger(const char *identity, bool wait);

/* On x86 the compiler assumes a different incoming stack alignment than what we get.
 * This will cause long long variables to be misaligned when building with
 * '-mlong-double' (for correct struct layouts). Normally, the compiler realigns the
 * stack itself on entry, but we have to do this ourselves here as the compiler does
 * not know that this is our entry point. */
#ifdef __i386__
#  define _realign_stack_ __attribute__((force_align_arg_pointer))
#else
#  define _realign_stack_
#endif

#define DEFINE_EFI_MAIN_FUNCTION(func, identity, wait_for_debugger)                    \
        EFI_SYSTEM_TABLE *ST;                                                          \
        EFI_BOOT_SERVICES *BS;                                                         \
        EFI_RUNTIME_SERVICES *RT;                                                      \
        _realign_stack_                                                                \
        EFIAPI EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *system_table);  \
        EFIAPI EFI_STATUS efi_main(EFI_HANDLE image, EFI_SYSTEM_TABLE *system_table) { \
                ST = system_table;                                                     \
                BS = system_table->BootServices;                                       \
                RT = system_table->RuntimeServices;                                    \
                __stack_chk_guard_init();                                              \
                notify_debugger((identity), (wait_for_debugger));                      \
                EFI_STATUS err = func(image);                                          \
                log_wait();                                                            \
                return err;                                                            \
        }

#if defined(__i386__) || defined(__x86_64__)
void beep(unsigned beep_count);
#else
static inline void beep(unsigned beep_count) {}
#endif

EFI_STATUS open_volume(EFI_HANDLE device, EFI_FILE **ret_file);

static inline bool efi_guid_equal(const EFI_GUID *a, const EFI_GUID *b) {
        return memcmp(a, b, sizeof(EFI_GUID)) == 0;
}

void *find_configuration_table(const EFI_GUID *guid);

char16_t *get_extra_dir(const EFI_DEVICE_PATH *file_path);