1 // SPDX-License-Identifier: GPL-2.0 <<
2 /* 1 /*
3 * Provide common bits of early_ioremap() supp 2 * Provide common bits of early_ioremap() support for architectures needing
4 * temporary mappings during boot before iorem 3 * temporary mappings during boot before ioremap() is available.
5 * 4 *
6 * This is mostly a direct copy of the x86 ear 5 * This is mostly a direct copy of the x86 early_ioremap implementation.
7 * 6 *
8 * (C) Copyright 1995 1996, 2014 Linus Torvald 7 * (C) Copyright 1995 1996, 2014 Linus Torvalds
9 * 8 *
10 */ 9 */
11 #include <linux/kernel.h> 10 #include <linux/kernel.h>
12 #include <linux/init.h> 11 #include <linux/init.h>
13 #include <linux/io.h> 12 #include <linux/io.h>
14 #include <linux/module.h> 13 #include <linux/module.h>
15 #include <linux/slab.h> 14 #include <linux/slab.h>
16 #include <linux/mm.h> 15 #include <linux/mm.h>
17 #include <linux/vmalloc.h> 16 #include <linux/vmalloc.h>
18 #include <asm/fixmap.h> 17 #include <asm/fixmap.h>
19 #include <asm/early_ioremap.h> 18 #include <asm/early_ioremap.h>
20 #include "internal.h" <<
21 19
22 #ifdef CONFIG_MMU 20 #ifdef CONFIG_MMU
23 static int early_ioremap_debug __initdata; 21 static int early_ioremap_debug __initdata;
24 22
25 static int __init early_ioremap_debug_setup(ch 23 static int __init early_ioremap_debug_setup(char *str)
26 { 24 {
27 early_ioremap_debug = 1; 25 early_ioremap_debug = 1;
28 26
29 return 0; 27 return 0;
30 } 28 }
31 early_param("early_ioremap_debug", early_iorem 29 early_param("early_ioremap_debug", early_ioremap_debug_setup);
32 30
33 static int after_paging_init __initdata; 31 static int after_paging_init __initdata;
34 32
35 pgprot_t __init __weak early_memremap_pgprot_a !! 33 void __init __weak early_ioremap_shutdown(void)
36 <<
37 <<
38 { 34 {
39 return prot; <<
40 } 35 }
41 36
42 void __init early_ioremap_reset(void) 37 void __init early_ioremap_reset(void)
43 { 38 {
>> 39 early_ioremap_shutdown();
44 after_paging_init = 1; 40 after_paging_init = 1;
45 } 41 }
46 42
47 /* 43 /*
48 * Generally, ioremap() is available after pag 44 * Generally, ioremap() is available after paging_init() has been called.
49 * Architectures wanting to allow early_iorema 45 * Architectures wanting to allow early_ioremap after paging_init() can
50 * define __late_set_fixmap and __late_clear_f 46 * define __late_set_fixmap and __late_clear_fixmap to do the right thing.
51 */ 47 */
52 #ifndef __late_set_fixmap 48 #ifndef __late_set_fixmap
53 static inline void __init __late_set_fixmap(en 49 static inline void __init __late_set_fixmap(enum fixed_addresses idx,
54 ph 50 phys_addr_t phys, pgprot_t prot)
55 { 51 {
56 BUG(); 52 BUG();
57 } 53 }
58 #endif 54 #endif
59 55
60 #ifndef __late_clear_fixmap 56 #ifndef __late_clear_fixmap
61 static inline void __init __late_clear_fixmap( 57 static inline void __init __late_clear_fixmap(enum fixed_addresses idx)
62 { 58 {
63 BUG(); 59 BUG();
64 } 60 }
65 #endif 61 #endif
66 62
67 static void __iomem *prev_map[FIX_BTMAPS_SLOTS 63 static void __iomem *prev_map[FIX_BTMAPS_SLOTS] __initdata;
68 static unsigned long prev_size[FIX_BTMAPS_SLOT 64 static unsigned long prev_size[FIX_BTMAPS_SLOTS] __initdata;
69 static unsigned long slot_virt[FIX_BTMAPS_SLOT 65 static unsigned long slot_virt[FIX_BTMAPS_SLOTS] __initdata;
70 66
71 void __init early_ioremap_setup(void) 67 void __init early_ioremap_setup(void)
72 { 68 {
73 int i; 69 int i;
74 70
75 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) !! 71 for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
76 WARN_ON_ONCE(prev_map[i]); !! 72 if (WARN_ON(prev_map[i]))
>> 73 break;
>> 74
>> 75 for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
77 slot_virt[i] = __fix_to_virt(F 76 slot_virt[i] = __fix_to_virt(FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*i);
78 } <<
79 } 77 }
80 78
81 static int __init check_early_ioremap_leak(voi 79 static int __init check_early_ioremap_leak(void)
82 { 80 {
83 int count = 0; 81 int count = 0;
84 int i; 82 int i;
85 83
86 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) 84 for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
87 if (prev_map[i]) 85 if (prev_map[i])
88 count++; 86 count++;
89 87
90 if (WARN(count, KERN_WARNING 88 if (WARN(count, KERN_WARNING
91 "Debug warning: early ioremap 89 "Debug warning: early ioremap leak of %d areas detected.\n"
92 "please boot with early_iorem 90 "please boot with early_ioremap_debug and report the dmesg.\n",
93 count)) 91 count))
94 return 1; 92 return 1;
95 return 0; 93 return 0;
96 } 94 }
97 late_initcall(check_early_ioremap_leak); 95 late_initcall(check_early_ioremap_leak);
98 96
99 static void __init __iomem * 97 static void __init __iomem *
100 __early_ioremap(resource_size_t phys_addr, uns 98 __early_ioremap(resource_size_t phys_addr, unsigned long size, pgprot_t prot)
101 { 99 {
102 unsigned long offset; 100 unsigned long offset;
103 resource_size_t last_addr; 101 resource_size_t last_addr;
104 unsigned int nrpages; 102 unsigned int nrpages;
105 enum fixed_addresses idx; 103 enum fixed_addresses idx;
106 int i, slot; 104 int i, slot;
107 105
108 WARN_ON(system_state >= SYSTEM_RUNNING !! 106 WARN_ON(system_state != SYSTEM_BOOTING);
109 107
110 slot = -1; 108 slot = -1;
111 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) 109 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
112 if (!prev_map[i]) { 110 if (!prev_map[i]) {
113 slot = i; 111 slot = i;
114 break; 112 break;
115 } 113 }
116 } 114 }
117 115
118 if (WARN(slot < 0, "%s(%pa, %08lx) not !! 116 if (WARN(slot < 0, "%s(%08llx, %08lx) not found slot\n",
119 __func__, &phys_addr, size)) !! 117 __func__, (u64)phys_addr, size))
120 return NULL; 118 return NULL;
121 119
122 /* Don't allow wraparound or zero size 120 /* Don't allow wraparound or zero size */
123 last_addr = phys_addr + size - 1; 121 last_addr = phys_addr + size - 1;
124 if (WARN_ON(!size || last_addr < phys_ 122 if (WARN_ON(!size || last_addr < phys_addr))
125 return NULL; 123 return NULL;
126 124
127 prev_size[slot] = size; 125 prev_size[slot] = size;
128 /* 126 /*
129 * Mappings have to be page-aligned 127 * Mappings have to be page-aligned
130 */ 128 */
131 offset = offset_in_page(phys_addr); 129 offset = offset_in_page(phys_addr);
132 phys_addr &= PAGE_MASK; 130 phys_addr &= PAGE_MASK;
133 size = PAGE_ALIGN(last_addr + 1) - phy 131 size = PAGE_ALIGN(last_addr + 1) - phys_addr;
134 132
135 /* 133 /*
136 * Mappings have to fit in the FIX_BTM 134 * Mappings have to fit in the FIX_BTMAP area.
137 */ 135 */
138 nrpages = size >> PAGE_SHIFT; 136 nrpages = size >> PAGE_SHIFT;
139 if (WARN_ON(nrpages > NR_FIX_BTMAPS)) 137 if (WARN_ON(nrpages > NR_FIX_BTMAPS))
140 return NULL; 138 return NULL;
141 139
142 /* 140 /*
143 * Ok, go for it.. 141 * Ok, go for it..
144 */ 142 */
145 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS* 143 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot;
146 while (nrpages > 0) { 144 while (nrpages > 0) {
147 if (after_paging_init) 145 if (after_paging_init)
148 __late_set_fixmap(idx, 146 __late_set_fixmap(idx, phys_addr, prot);
149 else 147 else
150 __early_set_fixmap(idx 148 __early_set_fixmap(idx, phys_addr, prot);
151 phys_addr += PAGE_SIZE; 149 phys_addr += PAGE_SIZE;
152 --idx; 150 --idx;
153 --nrpages; 151 --nrpages;
154 } 152 }
155 WARN(early_ioremap_debug, "%s(%pa, %08 !! 153 WARN(early_ioremap_debug, "%s(%08llx, %08lx) [%d] => %08lx + %08lx\n",
156 __func__, &phys_addr, size, slot, !! 154 __func__, (u64)phys_addr, size, slot, offset, slot_virt[slot]);
157 155
158 prev_map[slot] = (void __iomem *)(offs 156 prev_map[slot] = (void __iomem *)(offset + slot_virt[slot]);
159 return prev_map[slot]; 157 return prev_map[slot];
160 } 158 }
161 159
162 void __init early_iounmap(void __iomem *addr, 160 void __init early_iounmap(void __iomem *addr, unsigned long size)
163 { 161 {
164 unsigned long virt_addr; 162 unsigned long virt_addr;
165 unsigned long offset; 163 unsigned long offset;
166 unsigned int nrpages; 164 unsigned int nrpages;
167 enum fixed_addresses idx; 165 enum fixed_addresses idx;
168 int i, slot; 166 int i, slot;
169 167
170 slot = -1; 168 slot = -1;
171 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) 169 for (i = 0; i < FIX_BTMAPS_SLOTS; i++) {
172 if (prev_map[i] == addr) { 170 if (prev_map[i] == addr) {
173 slot = i; 171 slot = i;
174 break; 172 break;
175 } 173 }
176 } 174 }
177 175
178 if (WARN(slot < 0, "%s(%p, %08lx) not !! 176 if (WARN(slot < 0, "early_iounmap(%p, %08lx) not found slot\n",
179 __func__, addr, size)) !! 177 addr, size))
180 return; 178 return;
181 179
182 if (WARN(prev_size[slot] != size, 180 if (WARN(prev_size[slot] != size,
183 "%s(%p, %08lx) [%d] size not !! 181 "early_iounmap(%p, %08lx) [%d] size not consistent %08lx\n",
184 __func__, addr, size, slot, !! 182 addr, size, slot, prev_size[slot]))
185 return; 183 return;
186 184
187 WARN(early_ioremap_debug, "%s(%p, %08l !! 185 WARN(early_ioremap_debug, "early_iounmap(%p, %08lx) [%d]\n",
188 __func__, addr, size, slot); !! 186 addr, size, slot);
189 187
190 virt_addr = (unsigned long)addr; 188 virt_addr = (unsigned long)addr;
191 if (WARN_ON(virt_addr < fix_to_virt(FI 189 if (WARN_ON(virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)))
192 return; 190 return;
193 191
194 offset = offset_in_page(virt_addr); 192 offset = offset_in_page(virt_addr);
195 nrpages = PAGE_ALIGN(offset + size) >> 193 nrpages = PAGE_ALIGN(offset + size) >> PAGE_SHIFT;
196 194
197 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS* 195 idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot;
198 while (nrpages > 0) { 196 while (nrpages > 0) {
199 if (after_paging_init) 197 if (after_paging_init)
200 __late_clear_fixmap(id 198 __late_clear_fixmap(idx);
201 else 199 else
202 __early_set_fixmap(idx 200 __early_set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR);
203 --idx; 201 --idx;
204 --nrpages; 202 --nrpages;
205 } 203 }
206 prev_map[slot] = NULL; 204 prev_map[slot] = NULL;
207 } 205 }
208 206
209 /* Remap an IO device */ 207 /* Remap an IO device */
210 void __init __iomem * 208 void __init __iomem *
211 early_ioremap(resource_size_t phys_addr, unsig 209 early_ioremap(resource_size_t phys_addr, unsigned long size)
212 { 210 {
213 return __early_ioremap(phys_addr, size 211 return __early_ioremap(phys_addr, size, FIXMAP_PAGE_IO);
214 } 212 }
215 213
216 /* Remap memory */ 214 /* Remap memory */
217 void __init * 215 void __init *
218 early_memremap(resource_size_t phys_addr, unsi 216 early_memremap(resource_size_t phys_addr, unsigned long size)
219 { 217 {
220 pgprot_t prot = early_memremap_pgprot_ !! 218 return (__force void *)__early_ioremap(phys_addr, size,
221 !! 219 FIXMAP_PAGE_NORMAL);
222 <<
223 return (__force void *)__early_ioremap <<
224 } 220 }
225 #ifdef FIXMAP_PAGE_RO 221 #ifdef FIXMAP_PAGE_RO
226 void __init * 222 void __init *
227 early_memremap_ro(resource_size_t phys_addr, u 223 early_memremap_ro(resource_size_t phys_addr, unsigned long size)
228 { 224 {
229 pgprot_t prot = early_memremap_pgprot_ !! 225 return (__force void *)__early_ioremap(phys_addr, size, FIXMAP_PAGE_RO);
230 <<
231 <<
232 return (__force void *)__early_ioremap <<
233 } <<
234 #endif <<
235 <<
236 #ifdef CONFIG_ARCH_USE_MEMREMAP_PROT <<
237 void __init * <<
238 early_memremap_prot(resource_size_t phys_addr, <<
239 unsigned long prot_val) <<
240 { <<
241 return (__force void *)__early_ioremap <<
242 <<
243 } 226 }
244 #endif 227 #endif
245 228
246 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE 229 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
247 230
248 void __init copy_from_early_mem(void *dest, ph 231 void __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size)
249 { 232 {
250 unsigned long slop, clen; 233 unsigned long slop, clen;
251 char *p; 234 char *p;
252 235
253 while (size) { 236 while (size) {
254 slop = offset_in_page(src); 237 slop = offset_in_page(src);
255 clen = size; 238 clen = size;
256 if (clen > MAX_MAP_CHUNK - slo 239 if (clen > MAX_MAP_CHUNK - slop)
257 clen = MAX_MAP_CHUNK - 240 clen = MAX_MAP_CHUNK - slop;
258 p = early_memremap(src & PAGE_ 241 p = early_memremap(src & PAGE_MASK, clen + slop);
259 memcpy(dest, p + slop, clen); 242 memcpy(dest, p + slop, clen);
260 early_memunmap(p, clen + slop) 243 early_memunmap(p, clen + slop);
261 dest += clen; 244 dest += clen;
262 src += clen; 245 src += clen;
263 size -= clen; 246 size -= clen;
264 } 247 }
265 } 248 }
266 249
267 #else /* CONFIG_MMU */ 250 #else /* CONFIG_MMU */
268 251
269 void __init __iomem * 252 void __init __iomem *
270 early_ioremap(resource_size_t phys_addr, unsig 253 early_ioremap(resource_size_t phys_addr, unsigned long size)
271 { 254 {
272 return (__force void __iomem *)phys_ad 255 return (__force void __iomem *)phys_addr;
273 } 256 }
274 257
275 /* Remap memory */ 258 /* Remap memory */
276 void __init * 259 void __init *
277 early_memremap(resource_size_t phys_addr, unsi 260 early_memremap(resource_size_t phys_addr, unsigned long size)
278 { 261 {
279 return (void *)phys_addr; 262 return (void *)phys_addr;
280 } 263 }
281 void __init * 264 void __init *
282 early_memremap_ro(resource_size_t phys_addr, u 265 early_memremap_ro(resource_size_t phys_addr, unsigned long size)
283 { 266 {
284 return (void *)phys_addr; 267 return (void *)phys_addr;
285 } 268 }
286 269
287 void __init early_iounmap(void __iomem *addr, 270 void __init early_iounmap(void __iomem *addr, unsigned long size)
288 { 271 {
289 } 272 }
290 273
291 #endif /* CONFIG_MMU */ 274 #endif /* CONFIG_MMU */
292 275
293 276
294 void __init early_memunmap(void *addr, unsigne 277 void __init early_memunmap(void *addr, unsigned long size)
295 { 278 {
296 early_iounmap((__force void __iomem *) 279 early_iounmap((__force void __iomem *)addr, size);
297 } 280 }
298 281
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.