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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> | |
33 | ||
c1cc1552 CM |
34 | #include <asm/sections.h> |
35 | #include <asm/setup.h> | |
36 | #include <asm/sizes.h> | |
37 | #include <asm/tlb.h> | |
38 | ||
39 | #include "mm.h" | |
40 | ||
c1cc1552 CM |
41 | phys_addr_t memstart_addr __read_mostly = 0; |
42 | ||
ec2eaa73 | 43 | #ifdef CONFIG_BLK_DEV_INITRD |
c1cc1552 CM |
44 | static int __init early_initrd(char *p) |
45 | { | |
46 | unsigned long start, size; | |
47 | char *endp; | |
48 | ||
49 | start = memparse(p, &endp); | |
50 | if (*endp == ',') { | |
51 | size = memparse(endp + 1, NULL); | |
52 | ||
ec2eaa73 RH |
53 | initrd_start = (unsigned long)__va(start); |
54 | initrd_end = (unsigned long)__va(start + size); | |
c1cc1552 CM |
55 | } |
56 | return 0; | |
57 | } | |
58 | early_param("initrd", early_initrd); | |
ec2eaa73 | 59 | #endif |
c1cc1552 CM |
60 | |
61 | #define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT) | |
62 | ||
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]; | |
67 | unsigned long max_dma32 = min; | |
68 | ||
69 | memset(zone_size, 0, sizeof(zone_size)); | |
70 | ||
71 | #ifdef CONFIG_ZONE_DMA32 | |
72 | /* 4GB maximum for 32-bit only capable devices */ | |
938edf5c WD |
73 | max_dma32 = max(min, min(max, MAX_DMA32_PFN)); |
74 | zone_size[ZONE_DMA32] = max_dma32 - min; | |
c1cc1552 CM |
75 | #endif |
76 | zone_size[ZONE_NORMAL] = max - max_dma32; | |
77 | ||
78 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); | |
79 | ||
80 | for_each_memblock(memory, reg) { | |
81 | unsigned long start = memblock_region_memory_base_pfn(reg); | |
82 | unsigned long end = memblock_region_memory_end_pfn(reg); | |
83 | ||
84 | if (start >= max) | |
85 | continue; | |
86 | #ifdef CONFIG_ZONE_DMA32 | |
87 | if (start < max_dma32) { | |
88 | unsigned long dma_end = min(end, max_dma32); | |
89 | zhole_size[ZONE_DMA32] -= dma_end - start; | |
90 | } | |
91 | #endif | |
92 | if (end > max_dma32) { | |
93 | unsigned long normal_end = min(end, max); | |
94 | unsigned long normal_start = max(start, max_dma32); | |
95 | zhole_size[ZONE_NORMAL] -= normal_end - normal_start; | |
96 | } | |
97 | } | |
98 | ||
99 | free_area_init_node(0, zone_size, min, zhole_size); | |
100 | } | |
101 | ||
102 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID | |
103 | int pfn_valid(unsigned long pfn) | |
104 | { | |
105 | return memblock_is_memory(pfn << PAGE_SHIFT); | |
106 | } | |
107 | EXPORT_SYMBOL(pfn_valid); | |
108 | #endif | |
109 | ||
110 | #ifndef CONFIG_SPARSEMEM | |
111 | static void arm64_memory_present(void) | |
112 | { | |
113 | } | |
114 | #else | |
115 | static void arm64_memory_present(void) | |
116 | { | |
117 | struct memblock_region *reg; | |
118 | ||
119 | for_each_memblock(memory, reg) | |
120 | memory_present(0, memblock_region_memory_base_pfn(reg), | |
121 | memblock_region_memory_end_pfn(reg)); | |
122 | } | |
123 | #endif | |
124 | ||
125 | void __init arm64_memblock_init(void) | |
126 | { | |
127 | u64 *reserve_map, base, size; | |
128 | ||
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 | ||
143 | /* Reserve the dtb region */ | |
144 | memblock_reserve(virt_to_phys(initial_boot_params), | |
145 | be32_to_cpu(initial_boot_params->totalsize)); | |
146 | ||
147 | /* | |
148 | * Process the reserve map. This will probably overlap the initrd | |
149 | * and dtb locations which are already reserved, but overlapping | |
150 | * doesn't hurt anything | |
151 | */ | |
152 | reserve_map = ((void*)initial_boot_params) + | |
153 | be32_to_cpu(initial_boot_params->off_mem_rsvmap); | |
154 | while (1) { | |
155 | base = be64_to_cpup(reserve_map++); | |
156 | size = be64_to_cpup(reserve_map++); | |
157 | if (!size) | |
158 | break; | |
159 | memblock_reserve(base, size); | |
160 | } | |
161 | ||
162 | memblock_allow_resize(); | |
163 | memblock_dump_all(); | |
164 | } | |
165 | ||
166 | void __init bootmem_init(void) | |
167 | { | |
168 | unsigned long min, max; | |
169 | ||
170 | min = PFN_UP(memblock_start_of_DRAM()); | |
171 | max = PFN_DOWN(memblock_end_of_DRAM()); | |
172 | ||
173 | /* | |
174 | * Sparsemem tries to allocate bootmem in memory_present(), so must be | |
175 | * done after the fixed reservations. | |
176 | */ | |
177 | arm64_memory_present(); | |
178 | ||
179 | sparse_init(); | |
180 | zone_sizes_init(min, max); | |
181 | ||
182 | high_memory = __va((max << PAGE_SHIFT) - 1) + 1; | |
183 | max_pfn = max_low_pfn = max; | |
184 | } | |
185 | ||
c1cc1552 CM |
186 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
187 | static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) | |
188 | { | |
189 | struct page *start_pg, *end_pg; | |
190 | unsigned long pg, pgend; | |
191 | ||
192 | /* | |
193 | * Convert start_pfn/end_pfn to a struct page pointer. | |
194 | */ | |
195 | start_pg = pfn_to_page(start_pfn - 1) + 1; | |
196 | end_pg = pfn_to_page(end_pfn - 1) + 1; | |
197 | ||
198 | /* | |
199 | * Convert to physical addresses, and round start upwards and end | |
200 | * downwards. | |
201 | */ | |
202 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); | |
203 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; | |
204 | ||
205 | /* | |
206 | * If there are free pages between these, free the section of the | |
207 | * memmap array. | |
208 | */ | |
209 | if (pg < pgend) | |
210 | free_bootmem(pg, pgend - pg); | |
211 | } | |
212 | ||
213 | /* | |
214 | * The mem_map array can get very big. Free the unused area of the memory map. | |
215 | */ | |
216 | static void __init free_unused_memmap(void) | |
217 | { | |
218 | unsigned long start, prev_end = 0; | |
219 | struct memblock_region *reg; | |
220 | ||
221 | for_each_memblock(memory, reg) { | |
222 | start = __phys_to_pfn(reg->base); | |
223 | ||
224 | #ifdef CONFIG_SPARSEMEM | |
225 | /* | |
226 | * Take care not to free memmap entries that don't exist due | |
227 | * to SPARSEMEM sections which aren't present. | |
228 | */ | |
229 | start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); | |
230 | #endif | |
231 | /* | |
232 | * If we had a previous bank, and there is a space between the | |
233 | * current bank and the previous, free it. | |
234 | */ | |
235 | if (prev_end && prev_end < start) | |
236 | free_memmap(prev_end, start); | |
237 | ||
238 | /* | |
239 | * Align up here since the VM subsystem insists that the | |
240 | * memmap entries are valid from the bank end aligned to | |
241 | * MAX_ORDER_NR_PAGES. | |
242 | */ | |
243 | prev_end = ALIGN(start + __phys_to_pfn(reg->size), | |
244 | MAX_ORDER_NR_PAGES); | |
245 | } | |
246 | ||
247 | #ifdef CONFIG_SPARSEMEM | |
248 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) | |
249 | free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); | |
250 | #endif | |
251 | } | |
252 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
253 | ||
254 | /* | |
255 | * mem_init() marks the free areas in the mem_map and tells us how much memory | |
256 | * is free. This is done after various parts of the system have claimed their | |
257 | * memory after the kernel image. | |
258 | */ | |
259 | void __init mem_init(void) | |
260 | { | |
27222a3d | 261 | arm64_swiotlb_init(); |
c1cc1552 CM |
262 | |
263 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; | |
264 | ||
265 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
c1cc1552 CM |
266 | free_unused_memmap(); |
267 | #endif | |
bee4ebd1 | 268 | /* this will put all unused low memory onto the freelists */ |
0c988534 | 269 | free_all_bootmem(); |
c1cc1552 | 270 | |
6879ea83 | 271 | mem_init_print_info(NULL); |
c1cc1552 CM |
272 | |
273 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 | |
274 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 | |
275 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) | |
276 | ||
277 | pr_notice("Virtual kernel memory layout:\n" | |
278 | " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
279 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
280 | " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
281 | #endif | |
282 | " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
283 | " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" | |
284 | " .init : 0x%p" " - 0x%p" " (%6ld kB)\n" | |
285 | " .text : 0x%p" " - 0x%p" " (%6ld kB)\n" | |
286 | " .data : 0x%p" " - 0x%p" " (%6ld kB)\n", | |
287 | MLM(VMALLOC_START, VMALLOC_END), | |
288 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
289 | MLM((unsigned long)virt_to_page(PAGE_OFFSET), | |
290 | (unsigned long)virt_to_page(high_memory)), | |
291 | #endif | |
292 | MLM(MODULES_VADDR, MODULES_END), | |
293 | MLM(PAGE_OFFSET, (unsigned long)high_memory), | |
294 | ||
295 | MLK_ROUNDUP(__init_begin, __init_end), | |
296 | MLK_ROUNDUP(_text, _etext), | |
297 | MLK_ROUNDUP(_sdata, _edata)); | |
298 | ||
299 | #undef MLK | |
300 | #undef MLM | |
301 | #undef MLK_ROUNDUP | |
302 | ||
303 | /* | |
304 | * Check boundaries twice: Some fundamental inconsistencies can be | |
305 | * detected at build time already. | |
306 | */ | |
307 | #ifdef CONFIG_COMPAT | |
308 | BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); | |
309 | #endif | |
310 | BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); | |
311 | BUG_ON(TASK_SIZE_64 > MODULES_VADDR); | |
312 | ||
bee4ebd1 | 313 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
c1cc1552 CM |
314 | extern int sysctl_overcommit_memory; |
315 | /* | |
316 | * On a machine this small we won't get anywhere without | |
317 | * overcommit, so turn it on by default. | |
318 | */ | |
319 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
320 | } | |
321 | } | |
322 | ||
323 | void free_initmem(void) | |
324 | { | |
9af5b807 | 325 | free_initmem_default(0); |
c1cc1552 CM |
326 | } |
327 | ||
328 | #ifdef CONFIG_BLK_DEV_INITRD | |
329 | ||
330 | static int keep_initrd; | |
331 | ||
332 | void free_initrd_mem(unsigned long start, unsigned long end) | |
333 | { | |
9af5b807 JL |
334 | if (!keep_initrd) |
335 | free_reserved_area((void *)start, (void *)end, 0, "initrd"); | |
c1cc1552 CM |
336 | } |
337 | ||
338 | static int __init keepinitrd_setup(char *__unused) | |
339 | { | |
340 | keep_initrd = 1; | |
341 | return 1; | |
342 | } | |
343 | ||
344 | __setup("keepinitrd", keepinitrd_setup); | |
345 | #endif |