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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 | */ | |
74 | static phys_addr_t max_zone_dma_phys(void) | |
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 */ |
19e7640d | 89 | if (IS_ENABLED(CONFIG_ZONE_DMA)) { |
a1e50a82 | 90 | max_dma = PFN_DOWN(arm64_dma_phys_limit); |
19e7640d CM |
91 | zone_size[ZONE_DMA] = max_dma - min; |
92 | } | |
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 CM |
103 | |
104 | if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) { | |
105 | unsigned long dma_end = min(end, max_dma); | |
106 | zhole_size[ZONE_DMA] -= dma_end - start; | |
c1cc1552 | 107 | } |
19e7640d CM |
108 | |
109 | if (end > max_dma) { | |
c1cc1552 | 110 | unsigned long normal_end = min(end, max); |
19e7640d | 111 | unsigned long normal_start = max(start, max_dma); |
c1cc1552 CM |
112 | zhole_size[ZONE_NORMAL] -= normal_end - normal_start; |
113 | } | |
114 | } | |
115 | ||
116 | free_area_init_node(0, zone_size, min, zhole_size); | |
117 | } | |
118 | ||
119 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID | |
120 | int pfn_valid(unsigned long pfn) | |
121 | { | |
122 | return memblock_is_memory(pfn << PAGE_SHIFT); | |
123 | } | |
124 | EXPORT_SYMBOL(pfn_valid); | |
125 | #endif | |
126 | ||
127 | #ifndef CONFIG_SPARSEMEM | |
128 | static void arm64_memory_present(void) | |
129 | { | |
130 | } | |
131 | #else | |
132 | static void arm64_memory_present(void) | |
133 | { | |
134 | struct memblock_region *reg; | |
135 | ||
136 | for_each_memblock(memory, reg) | |
137 | memory_present(0, memblock_region_memory_base_pfn(reg), | |
138 | memblock_region_memory_end_pfn(reg)); | |
139 | } | |
140 | #endif | |
141 | ||
6083fe74 MR |
142 | static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX; |
143 | ||
144 | /* | |
145 | * Limit the memory size that was specified via FDT. | |
146 | */ | |
147 | static int __init early_mem(char *p) | |
148 | { | |
149 | if (!p) | |
150 | return 1; | |
151 | ||
152 | memory_limit = memparse(p, &p) & PAGE_MASK; | |
153 | pr_notice("Memory limited to %lldMB\n", memory_limit >> 20); | |
154 | ||
155 | return 0; | |
156 | } | |
157 | early_param("mem", early_mem); | |
158 | ||
c1cc1552 CM |
159 | void __init arm64_memblock_init(void) |
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)) | |
a1e50a82 CM |
177 | arm64_dma_phys_limit = max_zone_dma_phys(); |
178 | else | |
179 | arm64_dma_phys_limit = PHYS_MASK + 1; | |
180 | dma_contiguous_reserve(arm64_dma_phys_limit); | |
6ac2104d | 181 | |
c1cc1552 CM |
182 | memblock_allow_resize(); |
183 | memblock_dump_all(); | |
184 | } | |
185 | ||
186 | void __init bootmem_init(void) | |
187 | { | |
188 | unsigned long min, max; | |
189 | ||
190 | min = PFN_UP(memblock_start_of_DRAM()); | |
191 | max = PFN_DOWN(memblock_end_of_DRAM()); | |
192 | ||
36dd9086 VM |
193 | early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT); |
194 | ||
c1cc1552 CM |
195 | /* |
196 | * Sparsemem tries to allocate bootmem in memory_present(), so must be | |
197 | * done after the fixed reservations. | |
198 | */ | |
199 | arm64_memory_present(); | |
200 | ||
201 | sparse_init(); | |
202 | zone_sizes_init(min, max); | |
203 | ||
204 | high_memory = __va((max << PAGE_SHIFT) - 1) + 1; | |
205 | max_pfn = max_low_pfn = max; | |
206 | } | |
207 | ||
c1cc1552 CM |
208 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
209 | static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) | |
210 | { | |
211 | struct page *start_pg, *end_pg; | |
212 | unsigned long pg, pgend; | |
213 | ||
214 | /* | |
215 | * Convert start_pfn/end_pfn to a struct page pointer. | |
216 | */ | |
217 | start_pg = pfn_to_page(start_pfn - 1) + 1; | |
218 | end_pg = pfn_to_page(end_pfn - 1) + 1; | |
219 | ||
220 | /* | |
221 | * Convert to physical addresses, and round start upwards and end | |
222 | * downwards. | |
223 | */ | |
224 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); | |
225 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; | |
226 | ||
227 | /* | |
228 | * If there are free pages between these, free the section of the | |
229 | * memmap array. | |
230 | */ | |
231 | if (pg < pgend) | |
232 | free_bootmem(pg, pgend - pg); | |
233 | } | |
234 | ||
235 | /* | |
236 | * The mem_map array can get very big. Free the unused area of the memory map. | |
237 | */ | |
238 | static void __init free_unused_memmap(void) | |
239 | { | |
240 | unsigned long start, prev_end = 0; | |
241 | struct memblock_region *reg; | |
242 | ||
243 | for_each_memblock(memory, reg) { | |
244 | start = __phys_to_pfn(reg->base); | |
245 | ||
246 | #ifdef CONFIG_SPARSEMEM | |
247 | /* | |
248 | * Take care not to free memmap entries that don't exist due | |
249 | * to SPARSEMEM sections which aren't present. | |
250 | */ | |
251 | start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); | |
252 | #endif | |
253 | /* | |
254 | * If we had a previous bank, and there is a space between the | |
255 | * current bank and the previous, free it. | |
256 | */ | |
257 | if (prev_end && prev_end < start) | |
258 | free_memmap(prev_end, start); | |
259 | ||
260 | /* | |
261 | * Align up here since the VM subsystem insists that the | |
262 | * memmap entries are valid from the bank end aligned to | |
263 | * MAX_ORDER_NR_PAGES. | |
264 | */ | |
b9bcc919 | 265 | prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size), |
c1cc1552 CM |
266 | MAX_ORDER_NR_PAGES); |
267 | } | |
268 | ||
269 | #ifdef CONFIG_SPARSEMEM | |
270 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) | |
271 | free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); | |
272 | #endif | |
273 | } | |
274 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
275 | ||
276 | /* | |
277 | * mem_init() marks the free areas in the mem_map and tells us how much memory | |
278 | * is free. This is done after various parts of the system have claimed their | |
279 | * memory after the kernel image. | |
280 | */ | |
281 | void __init mem_init(void) | |
282 | { | |
a1e50a82 CM |
283 | swiotlb_init(1); |
284 | ||
a6583c7c | 285 | set_max_mapnr(pfn_to_page(max_pfn) - mem_map); |
c1cc1552 CM |
286 | |
287 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
c1cc1552 CM |
288 | free_unused_memmap(); |
289 | #endif | |
bee4ebd1 | 290 | /* this will put all unused low memory onto the freelists */ |
0c988534 | 291 | free_all_bootmem(); |
c1cc1552 | 292 | |
6879ea83 | 293 | mem_init_print_info(NULL); |
c1cc1552 CM |
294 | |
295 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 | |
296 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
08375198 | 297 | #define MLG(b, t) b, t, ((t) - (b)) >> 30 |
c1cc1552 CM |
298 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) |
299 | ||
300 | pr_notice("Virtual kernel memory layout:\n" | |
08375198 | 301 | " vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n" |
c1cc1552 | 302 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
08375198 CM |
303 | " vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n" |
304 | " 0x%16lx - 0x%16lx (%6ld MB actual)\n" | |
c1cc1552 | 305 | #endif |
08375198 | 306 | " fixed : 0x%16lx - 0x%16lx (%6ld KB)\n" |
aa03c428 | 307 | " PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n" |
c1cc1552 CM |
308 | " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" |
309 | " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
08375198 CM |
310 | " .init : 0x%p" " - 0x%p" " (%6ld KB)\n" |
311 | " .text : 0x%p" " - 0x%p" " (%6ld KB)\n" | |
312 | " .data : 0x%p" " - 0x%p" " (%6ld KB)\n", | |
313 | MLG(VMALLOC_START, VMALLOC_END), | |
c1cc1552 | 314 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
08375198 CM |
315 | MLG((unsigned long)vmemmap, |
316 | (unsigned long)vmemmap + VMEMMAP_SIZE), | |
c1cc1552 CM |
317 | MLM((unsigned long)virt_to_page(PAGE_OFFSET), |
318 | (unsigned long)virt_to_page(high_memory)), | |
319 | #endif | |
08375198 | 320 | MLK(FIXADDR_START, FIXADDR_TOP), |
aa03c428 | 321 | MLM(PCI_IO_START, PCI_IO_END), |
c1cc1552 CM |
322 | MLM(MODULES_VADDR, MODULES_END), |
323 | MLM(PAGE_OFFSET, (unsigned long)high_memory), | |
c1cc1552 CM |
324 | MLK_ROUNDUP(__init_begin, __init_end), |
325 | MLK_ROUNDUP(_text, _etext), | |
326 | MLK_ROUNDUP(_sdata, _edata)); | |
327 | ||
328 | #undef MLK | |
329 | #undef MLM | |
330 | #undef MLK_ROUNDUP | |
331 | ||
332 | /* | |
333 | * Check boundaries twice: Some fundamental inconsistencies can be | |
334 | * detected at build time already. | |
335 | */ | |
336 | #ifdef CONFIG_COMPAT | |
337 | BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); | |
338 | #endif | |
339 | BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); | |
340 | BUG_ON(TASK_SIZE_64 > MODULES_VADDR); | |
341 | ||
bee4ebd1 | 342 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
c1cc1552 CM |
343 | extern int sysctl_overcommit_memory; |
344 | /* | |
345 | * On a machine this small we won't get anywhere without | |
346 | * overcommit, so turn it on by default. | |
347 | */ | |
348 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
349 | } | |
350 | } | |
351 | ||
352 | void free_initmem(void) | |
353 | { | |
da141706 | 354 | fixup_init(); |
9af5b807 | 355 | free_initmem_default(0); |
e039ee4e | 356 | free_alternatives_memory(); |
c1cc1552 CM |
357 | } |
358 | ||
359 | #ifdef CONFIG_BLK_DEV_INITRD | |
360 | ||
662ba3db | 361 | static int keep_initrd __initdata; |
c1cc1552 | 362 | |
662ba3db | 363 | void __init free_initrd_mem(unsigned long start, unsigned long end) |
c1cc1552 | 364 | { |
0145058c | 365 | if (!keep_initrd) |
9af5b807 | 366 | free_reserved_area((void *)start, (void *)end, 0, "initrd"); |
c1cc1552 CM |
367 | } |
368 | ||
369 | static int __init keepinitrd_setup(char *__unused) | |
370 | { | |
371 | keep_initrd = 1; | |
372 | return 1; | |
373 | } | |
374 | ||
375 | __setup("keepinitrd", keepinitrd_setup); | |
376 | #endif |