treewide: use PHYS_ADDR_MAX to avoid type casting ULLONG_MAX
[muen/linux.git] / drivers / firmware / efi / arm-init.c
1 /*
2  * Extensible Firmware Interface
3  *
4  * Based on Extensible Firmware Interface Specification version 2.4
5  *
6  * Copyright (C) 2013 - 2015 Linaro Ltd.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  */
13
14 #define pr_fmt(fmt)     "efi: " fmt
15
16 #include <linux/efi.h>
17 #include <linux/init.h>
18 #include <linux/memblock.h>
19 #include <linux/mm_types.h>
20 #include <linux/of.h>
21 #include <linux/of_fdt.h>
22 #include <linux/platform_device.h>
23 #include <linux/screen_info.h>
24
25 #include <asm/efi.h>
26
27 u64 efi_system_table;
28
29 static int __init is_memory(efi_memory_desc_t *md)
30 {
31         if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC))
32                 return 1;
33         return 0;
34 }
35
36 /*
37  * Translate a EFI virtual address into a physical address: this is necessary,
38  * as some data members of the EFI system table are virtually remapped after
39  * SetVirtualAddressMap() has been called.
40  */
41 static phys_addr_t efi_to_phys(unsigned long addr)
42 {
43         efi_memory_desc_t *md;
44
45         for_each_efi_memory_desc(md) {
46                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
47                         continue;
48                 if (md->virt_addr == 0)
49                         /* no virtual mapping has been installed by the stub */
50                         break;
51                 if (md->virt_addr <= addr &&
52                     (addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT))
53                         return md->phys_addr + addr - md->virt_addr;
54         }
55         return addr;
56 }
57
58 static __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR;
59
60 static __initdata efi_config_table_type_t arch_tables[] = {
61         {LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, NULL, &screen_info_table},
62         {NULL_GUID, NULL, NULL}
63 };
64
65 static void __init init_screen_info(void)
66 {
67         struct screen_info *si;
68
69         if (screen_info_table != EFI_INVALID_TABLE_ADDR) {
70                 si = early_memremap_ro(screen_info_table, sizeof(*si));
71                 if (!si) {
72                         pr_err("Could not map screen_info config table\n");
73                         return;
74                 }
75                 screen_info = *si;
76                 early_memunmap(si, sizeof(*si));
77
78                 /* dummycon on ARM needs non-zero values for columns/lines */
79                 screen_info.orig_video_cols = 80;
80                 screen_info.orig_video_lines = 25;
81         }
82
83         if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
84             memblock_is_map_memory(screen_info.lfb_base))
85                 memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size);
86 }
87
88 static int __init uefi_init(void)
89 {
90         efi_char16_t *c16;
91         void *config_tables;
92         size_t table_size;
93         char vendor[100] = "unknown";
94         int i, retval;
95
96         efi.systab = early_memremap_ro(efi_system_table,
97                                        sizeof(efi_system_table_t));
98         if (efi.systab == NULL) {
99                 pr_warn("Unable to map EFI system table.\n");
100                 return -ENOMEM;
101         }
102
103         set_bit(EFI_BOOT, &efi.flags);
104         if (IS_ENABLED(CONFIG_64BIT))
105                 set_bit(EFI_64BIT, &efi.flags);
106
107         /*
108          * Verify the EFI Table
109          */
110         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
111                 pr_err("System table signature incorrect\n");
112                 retval = -EINVAL;
113                 goto out;
114         }
115         if ((efi.systab->hdr.revision >> 16) < 2)
116                 pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n",
117                         efi.systab->hdr.revision >> 16,
118                         efi.systab->hdr.revision & 0xffff);
119
120         efi.runtime_version = efi.systab->hdr.revision;
121
122         /* Show what we know for posterity */
123         c16 = early_memremap_ro(efi_to_phys(efi.systab->fw_vendor),
124                                 sizeof(vendor) * sizeof(efi_char16_t));
125         if (c16) {
126                 for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i)
127                         vendor[i] = c16[i];
128                 vendor[i] = '\0';
129                 early_memunmap(c16, sizeof(vendor) * sizeof(efi_char16_t));
130         }
131
132         pr_info("EFI v%u.%.02u by %s\n",
133                 efi.systab->hdr.revision >> 16,
134                 efi.systab->hdr.revision & 0xffff, vendor);
135
136         table_size = sizeof(efi_config_table_64_t) * efi.systab->nr_tables;
137         config_tables = early_memremap_ro(efi_to_phys(efi.systab->tables),
138                                           table_size);
139         if (config_tables == NULL) {
140                 pr_warn("Unable to map EFI config table array.\n");
141                 retval = -ENOMEM;
142                 goto out;
143         }
144         retval = efi_config_parse_tables(config_tables, efi.systab->nr_tables,
145                                          sizeof(efi_config_table_t),
146                                          arch_tables);
147
148         if (!retval)
149                 efi.config_table = (unsigned long)efi.systab->tables;
150
151         early_memunmap(config_tables, table_size);
152 out:
153         early_memunmap(efi.systab,  sizeof(efi_system_table_t));
154         return retval;
155 }
156
157 /*
158  * Return true for regions that can be used as System RAM.
159  */
160 static __init int is_usable_memory(efi_memory_desc_t *md)
161 {
162         switch (md->type) {
163         case EFI_LOADER_CODE:
164         case EFI_LOADER_DATA:
165         case EFI_ACPI_RECLAIM_MEMORY:
166         case EFI_BOOT_SERVICES_CODE:
167         case EFI_BOOT_SERVICES_DATA:
168         case EFI_CONVENTIONAL_MEMORY:
169         case EFI_PERSISTENT_MEMORY:
170                 /*
171                  * According to the spec, these regions are no longer reserved
172                  * after calling ExitBootServices(). However, we can only use
173                  * them as System RAM if they can be mapped writeback cacheable.
174                  */
175                 return (md->attribute & EFI_MEMORY_WB);
176         default:
177                 break;
178         }
179         return false;
180 }
181
182 static __init void reserve_regions(void)
183 {
184         efi_memory_desc_t *md;
185         u64 paddr, npages, size;
186
187         if (efi_enabled(EFI_DBG))
188                 pr_info("Processing EFI memory map:\n");
189
190         /*
191          * Discard memblocks discovered so far: if there are any at this
192          * point, they originate from memory nodes in the DT, and UEFI
193          * uses its own memory map instead.
194          */
195         memblock_dump_all();
196         memblock_remove(0, PHYS_ADDR_MAX);
197
198         for_each_efi_memory_desc(md) {
199                 paddr = md->phys_addr;
200                 npages = md->num_pages;
201
202                 if (efi_enabled(EFI_DBG)) {
203                         char buf[64];
204
205                         pr_info("  0x%012llx-0x%012llx %s\n",
206                                 paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
207                                 efi_md_typeattr_format(buf, sizeof(buf), md));
208                 }
209
210                 memrange_efi_to_native(&paddr, &npages);
211                 size = npages << PAGE_SHIFT;
212
213                 if (is_memory(md)) {
214                         early_init_dt_add_memory_arch(paddr, size);
215
216                         if (!is_usable_memory(md))
217                                 memblock_mark_nomap(paddr, size);
218
219                         /* keep ACPI reclaim memory intact for kexec etc. */
220                         if (md->type == EFI_ACPI_RECLAIM_MEMORY)
221                                 memblock_reserve(paddr, size);
222                 }
223         }
224 }
225
226 void __init efi_init(void)
227 {
228         struct efi_memory_map_data data;
229         struct efi_fdt_params params;
230
231         /* Grab UEFI information placed in FDT by stub */
232         if (!efi_get_fdt_params(&params))
233                 return;
234
235         efi_system_table = params.system_table;
236
237         data.desc_version = params.desc_ver;
238         data.desc_size = params.desc_size;
239         data.size = params.mmap_size;
240         data.phys_map = params.mmap;
241
242         if (efi_memmap_init_early(&data) < 0) {
243                 /*
244                 * If we are booting via UEFI, the UEFI memory map is the only
245                 * description of memory we have, so there is little point in
246                 * proceeding if we cannot access it.
247                 */
248                 panic("Unable to map EFI memory map.\n");
249         }
250
251         WARN(efi.memmap.desc_version != 1,
252              "Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
253               efi.memmap.desc_version);
254
255         if (uefi_init() < 0) {
256                 efi_memmap_unmap();
257                 return;
258         }
259
260         reserve_regions();
261         efi_esrt_init();
262         efi_memmap_unmap();
263
264         memblock_reserve(params.mmap & PAGE_MASK,
265                          PAGE_ALIGN(params.mmap_size +
266                                     (params.mmap & ~PAGE_MASK)));
267
268         init_screen_info();
269 }
270
271 static int __init register_gop_device(void)
272 {
273         void *pd;
274
275         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
276                 return 0;
277
278         pd = platform_device_register_data(NULL, "efi-framebuffer", 0,
279                                            &screen_info, sizeof(screen_info));
280         return PTR_ERR_OR_ZERO(pd);
281 }
282 subsys_initcall(register_gop_device);