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c1cc1552 CM |
1 | /* |
2 | * Based on arch/arm/mm/init.c | |
3 | * | |
4 | * Copyright (C) 1995-2005 Russell King | |
5 | * Copyright (C) 2012 ARM Ltd. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/export.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/swap.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/bootmem.h> | |
26 | #include <linux/mman.h> | |
27 | #include <linux/nodemask.h> | |
28 | #include <linux/initrd.h> | |
29 | #include <linux/gfp.h> | |
30 | #include <linux/memblock.h> | |
31 | #include <linux/sort.h> | |
32 | #include <linux/of_fdt.h> | |
19e7640d | 33 | #include <linux/dma-mapping.h> |
6ac2104d | 34 | #include <linux/dma-contiguous.h> |
86c8b27a | 35 | #include <linux/efi.h> |
a1e50a82 | 36 | #include <linux/swiotlb.h> |
c1cc1552 | 37 | |
08375198 | 38 | #include <asm/fixmap.h> |
aa03c428 | 39 | #include <asm/memory.h> |
c1cc1552 CM |
40 | #include <asm/sections.h> |
41 | #include <asm/setup.h> | |
42 | #include <asm/sizes.h> | |
43 | #include <asm/tlb.h> | |
e039ee4e | 44 | #include <asm/alternative.h> |
c1cc1552 CM |
45 | |
46 | #include "mm.h" | |
47 | ||
c1cc1552 | 48 | phys_addr_t memstart_addr __read_mostly = 0; |
a1e50a82 | 49 | phys_addr_t arm64_dma_phys_limit __read_mostly; |
c1cc1552 | 50 | |
ec2eaa73 | 51 | #ifdef CONFIG_BLK_DEV_INITRD |
c1cc1552 CM |
52 | static int __init early_initrd(char *p) |
53 | { | |
54 | unsigned long start, size; | |
55 | char *endp; | |
56 | ||
57 | start = memparse(p, &endp); | |
58 | if (*endp == ',') { | |
59 | size = memparse(endp + 1, NULL); | |
60 | ||
ec2eaa73 RH |
61 | initrd_start = (unsigned long)__va(start); |
62 | initrd_end = (unsigned long)__va(start + size); | |
c1cc1552 CM |
63 | } |
64 | return 0; | |
65 | } | |
66 | early_param("initrd", early_initrd); | |
ec2eaa73 | 67 | #endif |
c1cc1552 | 68 | |
d50314a6 CM |
69 | /* |
70 | * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It | |
71 | * currently assumes that for memory starting above 4G, 32-bit devices will | |
72 | * use a DMA offset. | |
73 | */ | |
a7c61a34 | 74 | static phys_addr_t __init max_zone_dma_phys(void) |
d50314a6 CM |
75 | { |
76 | phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32); | |
77 | return min(offset + (1ULL << 32), memblock_end_of_DRAM()); | |
78 | } | |
79 | ||
c1cc1552 CM |
80 | static void __init zone_sizes_init(unsigned long min, unsigned long max) |
81 | { | |
82 | struct memblock_region *reg; | |
83 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
19e7640d | 84 | unsigned long max_dma = min; |
c1cc1552 CM |
85 | |
86 | memset(zone_size, 0, sizeof(zone_size)); | |
87 | ||
c1cc1552 | 88 | /* 4GB maximum for 32-bit only capable devices */ |
86a5906e RM |
89 | #ifdef CONFIG_ZONE_DMA |
90 | max_dma = PFN_DOWN(arm64_dma_phys_limit); | |
91 | zone_size[ZONE_DMA] = max_dma - min; | |
92 | #endif | |
19e7640d | 93 | zone_size[ZONE_NORMAL] = max - max_dma; |
c1cc1552 CM |
94 | |
95 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); | |
96 | ||
97 | for_each_memblock(memory, reg) { | |
98 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
99 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
100 | ||
101 | if (start >= max) | |
102 | continue; | |
19e7640d | 103 | |
86a5906e RM |
104 | #ifdef CONFIG_ZONE_DMA |
105 | if (start < max_dma) { | |
19e7640d CM |
106 | unsigned long dma_end = min(end, max_dma); |
107 | zhole_size[ZONE_DMA] -= dma_end - start; | |
c1cc1552 | 108 | } |
86a5906e | 109 | #endif |
19e7640d | 110 | if (end > max_dma) { |
c1cc1552 | 111 | unsigned long normal_end = min(end, max); |
19e7640d | 112 | unsigned long normal_start = max(start, max_dma); |
c1cc1552 CM |
113 | zhole_size[ZONE_NORMAL] -= normal_end - normal_start; |
114 | } | |
115 | } | |
116 | ||
117 | free_area_init_node(0, zone_size, min, zhole_size); | |
118 | } | |
119 | ||
120 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID | |
121 | int pfn_valid(unsigned long pfn) | |
122 | { | |
68709f45 | 123 | return memblock_is_map_memory(pfn << PAGE_SHIFT); |
c1cc1552 CM |
124 | } |
125 | EXPORT_SYMBOL(pfn_valid); | |
126 | #endif | |
127 | ||
128 | #ifndef CONFIG_SPARSEMEM | |
a7c61a34 | 129 | static void __init arm64_memory_present(void) |
c1cc1552 CM |
130 | { |
131 | } | |
132 | #else | |
a7c61a34 | 133 | static void __init arm64_memory_present(void) |
c1cc1552 CM |
134 | { |
135 | struct memblock_region *reg; | |
136 | ||
137 | for_each_memblock(memory, reg) | |
138 | memory_present(0, memblock_region_memory_base_pfn(reg), | |
139 | memblock_region_memory_end_pfn(reg)); | |
140 | } | |
141 | #endif | |
142 | ||
6083fe74 MR |
143 | static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX; |
144 | ||
145 | /* | |
146 | * Limit the memory size that was specified via FDT. | |
147 | */ | |
148 | static int __init early_mem(char *p) | |
149 | { | |
150 | if (!p) | |
151 | return 1; | |
152 | ||
153 | memory_limit = memparse(p, &p) & PAGE_MASK; | |
154 | pr_notice("Memory limited to %lldMB\n", memory_limit >> 20); | |
155 | ||
156 | return 0; | |
157 | } | |
158 | early_param("mem", early_mem); | |
159 | ||
c1cc1552 CM |
160 | void __init arm64_memblock_init(void) |
161 | { | |
6083fe74 MR |
162 | memblock_enforce_memory_limit(memory_limit); |
163 | ||
bd00cd5f MR |
164 | /* |
165 | * Register the kernel text, kernel data, initrd, and initial | |
166 | * pagetables with memblock. | |
167 | */ | |
c1cc1552 CM |
168 | memblock_reserve(__pa(_text), _end - _text); |
169 | #ifdef CONFIG_BLK_DEV_INITRD | |
ec2eaa73 RH |
170 | if (initrd_start) |
171 | memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start); | |
c1cc1552 CM |
172 | #endif |
173 | ||
0ceac9e0 | 174 | early_init_fdt_scan_reserved_mem(); |
2d5a5612 CM |
175 | |
176 | /* 4GB maximum for 32-bit only capable devices */ | |
177 | if (IS_ENABLED(CONFIG_ZONE_DMA)) | |
a1e50a82 CM |
178 | arm64_dma_phys_limit = max_zone_dma_phys(); |
179 | else | |
180 | arm64_dma_phys_limit = PHYS_MASK + 1; | |
181 | dma_contiguous_reserve(arm64_dma_phys_limit); | |
6ac2104d | 182 | |
c1cc1552 CM |
183 | memblock_allow_resize(); |
184 | memblock_dump_all(); | |
185 | } | |
186 | ||
187 | void __init bootmem_init(void) | |
188 | { | |
189 | unsigned long min, max; | |
190 | ||
191 | min = PFN_UP(memblock_start_of_DRAM()); | |
192 | max = PFN_DOWN(memblock_end_of_DRAM()); | |
193 | ||
36dd9086 VM |
194 | early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT); |
195 | ||
c1cc1552 CM |
196 | /* |
197 | * Sparsemem tries to allocate bootmem in memory_present(), so must be | |
198 | * done after the fixed reservations. | |
199 | */ | |
200 | arm64_memory_present(); | |
201 | ||
202 | sparse_init(); | |
203 | zone_sizes_init(min, max); | |
204 | ||
205 | high_memory = __va((max << PAGE_SHIFT) - 1) + 1; | |
206 | max_pfn = max_low_pfn = max; | |
207 | } | |
208 | ||
c1cc1552 CM |
209 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
210 | static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) | |
211 | { | |
212 | struct page *start_pg, *end_pg; | |
213 | unsigned long pg, pgend; | |
214 | ||
215 | /* | |
216 | * Convert start_pfn/end_pfn to a struct page pointer. | |
217 | */ | |
218 | start_pg = pfn_to_page(start_pfn - 1) + 1; | |
219 | end_pg = pfn_to_page(end_pfn - 1) + 1; | |
220 | ||
221 | /* | |
222 | * Convert to physical addresses, and round start upwards and end | |
223 | * downwards. | |
224 | */ | |
225 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); | |
226 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; | |
227 | ||
228 | /* | |
229 | * If there are free pages between these, free the section of the | |
230 | * memmap array. | |
231 | */ | |
232 | if (pg < pgend) | |
233 | free_bootmem(pg, pgend - pg); | |
234 | } | |
235 | ||
236 | /* | |
237 | * The mem_map array can get very big. Free the unused area of the memory map. | |
238 | */ | |
239 | static void __init free_unused_memmap(void) | |
240 | { | |
241 | unsigned long start, prev_end = 0; | |
242 | struct memblock_region *reg; | |
243 | ||
244 | for_each_memblock(memory, reg) { | |
245 | start = __phys_to_pfn(reg->base); | |
246 | ||
247 | #ifdef CONFIG_SPARSEMEM | |
248 | /* | |
249 | * Take care not to free memmap entries that don't exist due | |
250 | * to SPARSEMEM sections which aren't present. | |
251 | */ | |
252 | start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); | |
253 | #endif | |
254 | /* | |
255 | * If we had a previous bank, and there is a space between the | |
256 | * current bank and the previous, free it. | |
257 | */ | |
258 | if (prev_end && prev_end < start) | |
259 | free_memmap(prev_end, start); | |
260 | ||
261 | /* | |
262 | * Align up here since the VM subsystem insists that the | |
263 | * memmap entries are valid from the bank end aligned to | |
264 | * MAX_ORDER_NR_PAGES. | |
265 | */ | |
b9bcc919 | 266 | prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size), |
c1cc1552 CM |
267 | MAX_ORDER_NR_PAGES); |
268 | } | |
269 | ||
270 | #ifdef CONFIG_SPARSEMEM | |
271 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) | |
272 | free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); | |
273 | #endif | |
274 | } | |
275 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
276 | ||
277 | /* | |
278 | * mem_init() marks the free areas in the mem_map and tells us how much memory | |
279 | * is free. This is done after various parts of the system have claimed their | |
280 | * memory after the kernel image. | |
281 | */ | |
282 | void __init mem_init(void) | |
283 | { | |
a1e50a82 CM |
284 | swiotlb_init(1); |
285 | ||
a6583c7c | 286 | set_max_mapnr(pfn_to_page(max_pfn) - mem_map); |
c1cc1552 CM |
287 | |
288 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
c1cc1552 CM |
289 | free_unused_memmap(); |
290 | #endif | |
bee4ebd1 | 291 | /* this will put all unused low memory onto the freelists */ |
0c988534 | 292 | free_all_bootmem(); |
c1cc1552 | 293 | |
6879ea83 | 294 | mem_init_print_info(NULL); |
c1cc1552 CM |
295 | |
296 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 | |
297 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
08375198 | 298 | #define MLG(b, t) b, t, ((t) - (b)) >> 30 |
c1cc1552 CM |
299 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) |
300 | ||
301 | pr_notice("Virtual kernel memory layout:\n" | |
ee7f881b LW |
302 | #ifdef CONFIG_KASAN |
303 | " kasan : 0x%16lx - 0x%16lx (%6ld GB)\n" | |
304 | #endif | |
08375198 | 305 | " vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n" |
c1cc1552 | 306 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
08375198 CM |
307 | " vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n" |
308 | " 0x%16lx - 0x%16lx (%6ld MB actual)\n" | |
c1cc1552 | 309 | #endif |
08375198 | 310 | " fixed : 0x%16lx - 0x%16lx (%6ld KB)\n" |
aa03c428 | 311 | " PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n" |
c1cc1552 CM |
312 | " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" |
313 | " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
08375198 CM |
314 | " .init : 0x%p" " - 0x%p" " (%6ld KB)\n" |
315 | " .text : 0x%p" " - 0x%p" " (%6ld KB)\n" | |
316 | " .data : 0x%p" " - 0x%p" " (%6ld KB)\n", | |
ee7f881b LW |
317 | #ifdef CONFIG_KASAN |
318 | MLG(KASAN_SHADOW_START, KASAN_SHADOW_END), | |
319 | #endif | |
08375198 | 320 | MLG(VMALLOC_START, VMALLOC_END), |
c1cc1552 | 321 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
08375198 CM |
322 | MLG((unsigned long)vmemmap, |
323 | (unsigned long)vmemmap + VMEMMAP_SIZE), | |
c1cc1552 CM |
324 | MLM((unsigned long)virt_to_page(PAGE_OFFSET), |
325 | (unsigned long)virt_to_page(high_memory)), | |
326 | #endif | |
08375198 | 327 | MLK(FIXADDR_START, FIXADDR_TOP), |
aa03c428 | 328 | MLM(PCI_IO_START, PCI_IO_END), |
c1cc1552 CM |
329 | MLM(MODULES_VADDR, MODULES_END), |
330 | MLM(PAGE_OFFSET, (unsigned long)high_memory), | |
c1cc1552 CM |
331 | MLK_ROUNDUP(__init_begin, __init_end), |
332 | MLK_ROUNDUP(_text, _etext), | |
333 | MLK_ROUNDUP(_sdata, _edata)); | |
334 | ||
335 | #undef MLK | |
336 | #undef MLM | |
337 | #undef MLK_ROUNDUP | |
338 | ||
339 | /* | |
340 | * Check boundaries twice: Some fundamental inconsistencies can be | |
341 | * detected at build time already. | |
342 | */ | |
343 | #ifdef CONFIG_COMPAT | |
344 | BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); | |
345 | #endif | |
346 | BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); | |
347 | BUG_ON(TASK_SIZE_64 > MODULES_VADDR); | |
348 | ||
bee4ebd1 | 349 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
c1cc1552 CM |
350 | extern int sysctl_overcommit_memory; |
351 | /* | |
352 | * On a machine this small we won't get anywhere without | |
353 | * overcommit, so turn it on by default. | |
354 | */ | |
355 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
356 | } | |
357 | } | |
358 | ||
359 | void free_initmem(void) | |
360 | { | |
da141706 | 361 | fixup_init(); |
9af5b807 | 362 | free_initmem_default(0); |
c1cc1552 CM |
363 | } |
364 | ||
365 | #ifdef CONFIG_BLK_DEV_INITRD | |
366 | ||
662ba3db | 367 | static int keep_initrd __initdata; |
c1cc1552 | 368 | |
662ba3db | 369 | void __init free_initrd_mem(unsigned long start, unsigned long end) |
c1cc1552 | 370 | { |
0145058c | 371 | if (!keep_initrd) |
9af5b807 | 372 | free_reserved_area((void *)start, (void *)end, 0, "initrd"); |
c1cc1552 CM |
373 | } |
374 | ||
375 | static int __init keepinitrd_setup(char *__unused) | |
376 | { | |
377 | keep_initrd = 1; | |
378 | return 1; | |
379 | } | |
380 | ||
381 | __setup("keepinitrd", keepinitrd_setup); | |
382 | #endif |