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