cmd: qfw: rename qemu_fw_cfg.[c|h] to qfw.[c|h]
[oweals/u-boot.git] / arch / x86 / cpu / qemu / acpi_table.c
1 /*
2  * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
3  *
4  * SPDX-License-Identifier:     GPL-2.0+
5  */
6
7 #include <common.h>
8 #include <command.h>
9 #include <errno.h>
10 #include <malloc.h>
11 #include <qfw.h>
12 #include <asm/io.h>
13 #include <asm/tables.h>
14 #include <asm/e820.h>
15 #include <linux/list.h>
16 #include <memalign.h>
17
18 /*
19  * This function allocates memory for ACPI tables
20  *
21  * @entry : BIOS linker command entry which tells where to allocate memory
22  *          (either high memory or low memory)
23  * @addr  : The address that should be used for low memory allcation. If the
24  *          memory allocation request is 'ZONE_HIGH' then this parameter will
25  *          be ignored.
26  * @return: 0 on success, or negative value on failure
27  */
28 static int bios_linker_allocate(struct bios_linker_entry *entry, u32 *addr)
29 {
30         uint32_t size, align;
31         struct fw_file *file;
32         unsigned long aligned_addr;
33
34         align = le32_to_cpu(entry->alloc.align);
35         /* align must be power of 2 */
36         if (align & (align - 1)) {
37                 printf("error: wrong alignment %u\n", align);
38                 return -EINVAL;
39         }
40
41         file = qemu_fwcfg_find_file(entry->alloc.file);
42         if (!file) {
43                 printf("error: can't find file %s\n", entry->alloc.file);
44                 return -ENOENT;
45         }
46
47         size = be32_to_cpu(file->cfg.size);
48
49         /*
50          * ZONE_HIGH means we need to allocate from high memory, since
51          * malloc space is already at the end of RAM, so we directly use it.
52          * If allocation zone is ZONE_FSEG, then we use the 'addr' passed
53          * in which is low memory
54          */
55         if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) {
56                 aligned_addr = (unsigned long)memalign(align, size);
57                 if (!aligned_addr) {
58                         printf("error: allocating resource\n");
59                         return -ENOMEM;
60                 }
61         } else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
62                 aligned_addr = ALIGN(*addr, align);
63         } else {
64                 printf("error: invalid allocation zone\n");
65                 return -EINVAL;
66         }
67
68         debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n",
69               file->cfg.name, size, entry->alloc.zone, align, aligned_addr);
70
71         qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
72                               size, (void *)aligned_addr);
73         file->addr = aligned_addr;
74
75         /* adjust address for low memory allocation */
76         if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG)
77                 *addr = (aligned_addr + size);
78
79         return 0;
80 }
81
82 /*
83  * This function patches ACPI tables previously loaded
84  * by bios_linker_allocate()
85  *
86  * @entry : BIOS linker command entry which tells how to patch
87  *          ACPI tables
88  * @return: 0 on success, or negative value on failure
89  */
90 static int bios_linker_add_pointer(struct bios_linker_entry *entry)
91 {
92         struct fw_file *dest, *src;
93         uint32_t offset = le32_to_cpu(entry->pointer.offset);
94         uint64_t pointer = 0;
95
96         dest = qemu_fwcfg_find_file(entry->pointer.dest_file);
97         if (!dest || !dest->addr)
98                 return -ENOENT;
99         src = qemu_fwcfg_find_file(entry->pointer.src_file);
100         if (!src || !src->addr)
101                 return -ENOENT;
102
103         debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n",
104               dest->addr, src->addr, offset, entry->pointer.size, pointer);
105
106         memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size);
107         pointer = le64_to_cpu(pointer);
108         pointer += (unsigned long)src->addr;
109         pointer = cpu_to_le64(pointer);
110         memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size);
111
112         return 0;
113 }
114
115 /*
116  * This function updates checksum fields of ACPI tables previously loaded
117  * by bios_linker_allocate()
118  *
119  * @entry : BIOS linker command entry which tells where to update ACPI table
120  *          checksums
121  * @return: 0 on success, or negative value on failure
122  */
123 static int bios_linker_add_checksum(struct bios_linker_entry *entry)
124 {
125         struct fw_file *file;
126         uint8_t *data, cksum = 0;
127         uint8_t *cksum_start;
128
129         file = qemu_fwcfg_find_file(entry->cksum.file);
130         if (!file || !file->addr)
131                 return -ENOENT;
132
133         data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset));
134         cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start));
135         cksum = table_compute_checksum(cksum_start,
136                                        le32_to_cpu(entry->cksum.length));
137         *data = cksum;
138
139         return 0;
140 }
141
142 unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
143 {
144         entries[0].addr = 0;
145         entries[0].size = ISA_START_ADDRESS;
146         entries[0].type = E820_RAM;
147
148         entries[1].addr = ISA_START_ADDRESS;
149         entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
150         entries[1].type = E820_RESERVED;
151
152         /*
153          * since we use memalign(malloc) to allocate high memory for
154          * storing ACPI tables, we need to reserve them in e820 tables,
155          * otherwise kernel will reclaim them and data will be corrupted
156          */
157         entries[2].addr = ISA_END_ADDRESS;
158         entries[2].size = gd->relocaddr - TOTAL_MALLOC_LEN - ISA_END_ADDRESS;
159         entries[2].type = E820_RAM;
160
161         /* for simplicity, reserve entire malloc space */
162         entries[3].addr = gd->relocaddr - TOTAL_MALLOC_LEN;
163         entries[3].size = TOTAL_MALLOC_LEN;
164         entries[3].type = E820_RESERVED;
165
166         entries[4].addr = gd->relocaddr;
167         entries[4].size = gd->ram_size - gd->relocaddr;
168         entries[4].type = E820_RESERVED;
169
170         entries[5].addr = CONFIG_PCIE_ECAM_BASE;
171         entries[5].size = CONFIG_PCIE_ECAM_SIZE;
172         entries[5].type = E820_RESERVED;
173
174         return 6;
175 }
176
177 /* This function loads and patches ACPI tables provided by QEMU */
178 u32 write_acpi_tables(u32 addr)
179 {
180         int i, ret = 0;
181         struct fw_file *file;
182         struct bios_linker_entry *table_loader;
183         struct bios_linker_entry *entry;
184         uint32_t size;
185
186         /* make sure fw_list is loaded */
187         ret = qemu_fwcfg_read_firmware_list();
188         if (ret) {
189                 printf("error: can't read firmware file list\n");
190                 return addr;
191         }
192
193         file = qemu_fwcfg_find_file("etc/table-loader");
194         if (!file) {
195                 printf("error: can't find etc/table-loader\n");
196                 return addr;
197         }
198
199         size = be32_to_cpu(file->cfg.size);
200         if ((size % sizeof(*entry)) != 0) {
201                 printf("error: table-loader maybe corrupted\n");
202                 return addr;
203         }
204
205         table_loader = malloc(size);
206         if (!table_loader) {
207                 printf("error: no memory for table-loader\n");
208                 return addr;
209         }
210
211         qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
212                               size, table_loader);
213
214         for (i = 0; i < (size / sizeof(*entry)); i++) {
215                 entry = table_loader + i;
216                 switch (le32_to_cpu(entry->command)) {
217                 case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
218                         ret = bios_linker_allocate(entry, &addr);
219                         if (ret)
220                                 goto out;
221                         break;
222                 case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
223                         ret = bios_linker_add_pointer(entry);
224                         if (ret)
225                                 goto out;
226                         break;
227                 case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
228                         ret = bios_linker_add_checksum(entry);
229                         if (ret)
230                                 goto out;
231                         break;
232                 default:
233                         break;
234                 }
235         }
236
237 out:
238         if (ret) {
239                 struct fw_cfg_file_iter iter;
240                 for (file = qemu_fwcfg_file_iter_init(&iter);
241                      !qemu_fwcfg_file_iter_end(&iter);
242                      file = qemu_fwcfg_file_iter_next(&iter)) {
243                         if (file->addr) {
244                                 free((void *)file->addr);
245                                 file->addr = 0;
246                         }
247                 }
248         }
249
250         free(table_loader);
251         return addr;
252 }