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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> |
c1cc1552 | 35 | |
c1cc1552 CM |
36 | #include <asm/sections.h> |
37 | #include <asm/setup.h> | |
38 | #include <asm/sizes.h> | |
39 | #include <asm/tlb.h> | |
40 | ||
41 | #include "mm.h" | |
42 | ||
c1cc1552 CM |
43 | phys_addr_t memstart_addr __read_mostly = 0; |
44 | ||
ec2eaa73 | 45 | #ifdef CONFIG_BLK_DEV_INITRD |
c1cc1552 CM |
46 | static int __init early_initrd(char *p) |
47 | { | |
48 | unsigned long start, size; | |
49 | char *endp; | |
50 | ||
51 | start = memparse(p, &endp); | |
52 | if (*endp == ',') { | |
53 | size = memparse(endp + 1, NULL); | |
54 | ||
ec2eaa73 RH |
55 | initrd_start = (unsigned long)__va(start); |
56 | initrd_end = (unsigned long)__va(start + size); | |
c1cc1552 CM |
57 | } |
58 | return 0; | |
59 | } | |
60 | early_param("initrd", early_initrd); | |
ec2eaa73 | 61 | #endif |
c1cc1552 | 62 | |
c1cc1552 CM |
63 | static void __init zone_sizes_init(unsigned long min, unsigned long max) |
64 | { | |
65 | struct memblock_region *reg; | |
66 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; | |
19e7640d | 67 | unsigned long max_dma = min; |
c1cc1552 CM |
68 | |
69 | memset(zone_size, 0, sizeof(zone_size)); | |
70 | ||
c1cc1552 | 71 | /* 4GB maximum for 32-bit only capable devices */ |
19e7640d CM |
72 | if (IS_ENABLED(CONFIG_ZONE_DMA)) { |
73 | unsigned long max_dma_phys = | |
74 | (unsigned long)dma_to_phys(NULL, DMA_BIT_MASK(32) + 1); | |
75 | max_dma = max(min, min(max, max_dma_phys >> PAGE_SHIFT)); | |
76 | zone_size[ZONE_DMA] = max_dma - min; | |
77 | } | |
78 | zone_size[ZONE_NORMAL] = max - max_dma; | |
c1cc1552 CM |
79 | |
80 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); | |
81 | ||
82 | for_each_memblock(memory, reg) { | |
83 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
84 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
85 | ||
86 | if (start >= max) | |
87 | continue; | |
19e7640d CM |
88 | |
89 | if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) { | |
90 | unsigned long dma_end = min(end, max_dma); | |
91 | zhole_size[ZONE_DMA] -= dma_end - start; | |
c1cc1552 | 92 | } |
19e7640d CM |
93 | |
94 | if (end > max_dma) { | |
c1cc1552 | 95 | unsigned long normal_end = min(end, max); |
19e7640d | 96 | unsigned long normal_start = max(start, max_dma); |
c1cc1552 CM |
97 | zhole_size[ZONE_NORMAL] -= normal_end - normal_start; |
98 | } | |
99 | } | |
100 | ||
101 | free_area_init_node(0, zone_size, min, zhole_size); | |
102 | } | |
103 | ||
104 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID | |
105 | int pfn_valid(unsigned long pfn) | |
106 | { | |
107 | return memblock_is_memory(pfn << PAGE_SHIFT); | |
108 | } | |
109 | EXPORT_SYMBOL(pfn_valid); | |
110 | #endif | |
111 | ||
112 | #ifndef CONFIG_SPARSEMEM | |
113 | static void arm64_memory_present(void) | |
114 | { | |
115 | } | |
116 | #else | |
117 | static void arm64_memory_present(void) | |
118 | { | |
119 | struct memblock_region *reg; | |
120 | ||
121 | for_each_memblock(memory, reg) | |
122 | memory_present(0, memblock_region_memory_base_pfn(reg), | |
123 | memblock_region_memory_end_pfn(reg)); | |
124 | } | |
125 | #endif | |
126 | ||
127 | void __init arm64_memblock_init(void) | |
128 | { | |
c1cc1552 CM |
129 | /* Register the kernel text, kernel data and initrd with memblock */ |
130 | memblock_reserve(__pa(_text), _end - _text); | |
131 | #ifdef CONFIG_BLK_DEV_INITRD | |
ec2eaa73 RH |
132 | if (initrd_start) |
133 | memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start); | |
c1cc1552 CM |
134 | #endif |
135 | ||
136 | /* | |
137 | * Reserve the page tables. These are already in use, | |
138 | * and can only be in node 0. | |
139 | */ | |
140 | memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE); | |
141 | memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE); | |
142 | ||
9bf14b7c | 143 | early_init_fdt_scan_reserved_mem(); |
6ac2104d LA |
144 | dma_contiguous_reserve(0); |
145 | ||
c1cc1552 CM |
146 | memblock_allow_resize(); |
147 | memblock_dump_all(); | |
148 | } | |
149 | ||
150 | void __init bootmem_init(void) | |
151 | { | |
152 | unsigned long min, max; | |
153 | ||
154 | min = PFN_UP(memblock_start_of_DRAM()); | |
155 | max = PFN_DOWN(memblock_end_of_DRAM()); | |
156 | ||
157 | /* | |
158 | * Sparsemem tries to allocate bootmem in memory_present(), so must be | |
159 | * done after the fixed reservations. | |
160 | */ | |
161 | arm64_memory_present(); | |
162 | ||
163 | sparse_init(); | |
164 | zone_sizes_init(min, max); | |
165 | ||
166 | high_memory = __va((max << PAGE_SHIFT) - 1) + 1; | |
167 | max_pfn = max_low_pfn = max; | |
168 | } | |
169 | ||
c1cc1552 CM |
170 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
171 | static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) | |
172 | { | |
173 | struct page *start_pg, *end_pg; | |
174 | unsigned long pg, pgend; | |
175 | ||
176 | /* | |
177 | * Convert start_pfn/end_pfn to a struct page pointer. | |
178 | */ | |
179 | start_pg = pfn_to_page(start_pfn - 1) + 1; | |
180 | end_pg = pfn_to_page(end_pfn - 1) + 1; | |
181 | ||
182 | /* | |
183 | * Convert to physical addresses, and round start upwards and end | |
184 | * downwards. | |
185 | */ | |
186 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); | |
187 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; | |
188 | ||
189 | /* | |
190 | * If there are free pages between these, free the section of the | |
191 | * memmap array. | |
192 | */ | |
193 | if (pg < pgend) | |
194 | free_bootmem(pg, pgend - pg); | |
195 | } | |
196 | ||
197 | /* | |
198 | * The mem_map array can get very big. Free the unused area of the memory map. | |
199 | */ | |
200 | static void __init free_unused_memmap(void) | |
201 | { | |
202 | unsigned long start, prev_end = 0; | |
203 | struct memblock_region *reg; | |
204 | ||
205 | for_each_memblock(memory, reg) { | |
206 | start = __phys_to_pfn(reg->base); | |
207 | ||
208 | #ifdef CONFIG_SPARSEMEM | |
209 | /* | |
210 | * Take care not to free memmap entries that don't exist due | |
211 | * to SPARSEMEM sections which aren't present. | |
212 | */ | |
213 | start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); | |
214 | #endif | |
215 | /* | |
216 | * If we had a previous bank, and there is a space between the | |
217 | * current bank and the previous, free it. | |
218 | */ | |
219 | if (prev_end && prev_end < start) | |
220 | free_memmap(prev_end, start); | |
221 | ||
222 | /* | |
223 | * Align up here since the VM subsystem insists that the | |
224 | * memmap entries are valid from the bank end aligned to | |
225 | * MAX_ORDER_NR_PAGES. | |
226 | */ | |
227 | prev_end = ALIGN(start + __phys_to_pfn(reg->size), | |
228 | MAX_ORDER_NR_PAGES); | |
229 | } | |
230 | ||
231 | #ifdef CONFIG_SPARSEMEM | |
232 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) | |
233 | free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); | |
234 | #endif | |
235 | } | |
236 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
237 | ||
238 | /* | |
239 | * mem_init() marks the free areas in the mem_map and tells us how much memory | |
240 | * is free. This is done after various parts of the system have claimed their | |
241 | * memory after the kernel image. | |
242 | */ | |
243 | void __init mem_init(void) | |
244 | { | |
c1cc1552 CM |
245 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
246 | ||
247 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
c1cc1552 CM |
248 | free_unused_memmap(); |
249 | #endif | |
bee4ebd1 | 250 | /* this will put all unused low memory onto the freelists */ |
0c988534 | 251 | free_all_bootmem(); |
c1cc1552 | 252 | |
6879ea83 | 253 | mem_init_print_info(NULL); |
c1cc1552 CM |
254 | |
255 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 | |
256 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
257 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
258 | ||
259 | pr_notice("Virtual kernel memory layout:\n" | |
260 | " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
261 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
262 | " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
263 | #endif | |
264 | " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
265 | " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
266 | " .init : 0x%p" " - 0x%p" " (%6ld kB)\n" | |
267 | " .text : 0x%p" " - 0x%p" " (%6ld kB)\n" | |
268 | " .data : 0x%p" " - 0x%p" " (%6ld kB)\n", | |
269 | MLM(VMALLOC_START, VMALLOC_END), | |
270 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
271 | MLM((unsigned long)virt_to_page(PAGE_OFFSET), | |
272 | (unsigned long)virt_to_page(high_memory)), | |
273 | #endif | |
274 | MLM(MODULES_VADDR, MODULES_END), | |
275 | MLM(PAGE_OFFSET, (unsigned long)high_memory), | |
276 | ||
277 | MLK_ROUNDUP(__init_begin, __init_end), | |
278 | MLK_ROUNDUP(_text, _etext), | |
279 | MLK_ROUNDUP(_sdata, _edata)); | |
280 | ||
281 | #undef MLK | |
282 | #undef MLM | |
283 | #undef MLK_ROUNDUP | |
284 | ||
285 | /* | |
286 | * Check boundaries twice: Some fundamental inconsistencies can be | |
287 | * detected at build time already. | |
288 | */ | |
289 | #ifdef CONFIG_COMPAT | |
290 | BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); | |
291 | #endif | |
292 | BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); | |
293 | BUG_ON(TASK_SIZE_64 > MODULES_VADDR); | |
294 | ||
bee4ebd1 | 295 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
c1cc1552 CM |
296 | extern int sysctl_overcommit_memory; |
297 | /* | |
298 | * On a machine this small we won't get anywhere without | |
299 | * overcommit, so turn it on by default. | |
300 | */ | |
301 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
302 | } | |
303 | } | |
304 | ||
305 | void free_initmem(void) | |
306 | { | |
9af5b807 | 307 | free_initmem_default(0); |
c1cc1552 CM |
308 | } |
309 | ||
310 | #ifdef CONFIG_BLK_DEV_INITRD | |
311 | ||
312 | static int keep_initrd; | |
313 | ||
314 | void free_initrd_mem(unsigned long start, unsigned long end) | |
315 | { | |
9af5b807 JL |
316 | if (!keep_initrd) |
317 | free_reserved_area((void *)start, (void *)end, 0, "initrd"); | |
c1cc1552 CM |
318 | } |
319 | ||
320 | static int __init keepinitrd_setup(char *__unused) | |
321 | { | |
322 | keep_initrd = 1; | |
323 | return 1; | |
324 | } | |
325 | ||
326 | __setup("keepinitrd", keepinitrd_setup); | |
327 | #endif |