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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 #include <linux/dma-mapping.h>
34 #include <linux/dma-contiguous.h>
35 #include <linux/efi.h>
36 #include <linux/swiotlb.h>
37
38 #include <asm/fixmap.h>
39 #include <asm/memory.h>
40 #include <asm/sections.h>
41 #include <asm/setup.h>
42 #include <asm/sizes.h>
43 #include <asm/tlb.h>
44 #include <asm/alternative.h>
45
46 #include "mm.h"
47
48 phys_addr_t memstart_addr __read_mostly = 0;
49 phys_addr_t arm64_dma_phys_limit __read_mostly;
50
51 #ifdef CONFIG_BLK_DEV_INITRD
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
61 initrd_start = (unsigned long)__va(start);
62 initrd_end = (unsigned long)__va(start + size);
63 }
64 return 0;
65 }
66 early_param("initrd", early_initrd);
67 #endif
68
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 __init 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
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];
84 unsigned long max_dma = min;
85
86 memset(zone_size, 0, sizeof(zone_size));
87
88 /* 4GB maximum for 32-bit only capable devices */
89 #ifdef CONFIG_ZONE_DMA
90 max_dma = PFN_DOWN(arm64_dma_phys_limit);
91 zone_size[ZONE_DMA] = max_dma - min;
92 #endif
93 zone_size[ZONE_NORMAL] = max - max_dma;
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;
103
104 #ifdef CONFIG_ZONE_DMA
105 if (start < max_dma) {
106 unsigned long dma_end = min(end, max_dma);
107 zhole_size[ZONE_DMA] -= dma_end - start;
108 }
109 #endif
110 if (end > max_dma) {
111 unsigned long normal_end = min(end, max);
112 unsigned long normal_start = max(start, max_dma);
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 {
123 return memblock_is_map_memory(pfn << PAGE_SHIFT);
124 }
125 EXPORT_SYMBOL(pfn_valid);
126 #endif
127
128 #ifndef CONFIG_SPARSEMEM
129 static void __init arm64_memory_present(void)
130 {
131 }
132 #else
133 static void __init arm64_memory_present(void)
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
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
160 void __init arm64_memblock_init(void)
161 {
162 memblock_enforce_memory_limit(memory_limit);
163
164 /*
165 * Register the kernel text, kernel data, initrd, and initial
166 * pagetables with memblock.
167 */
168 memblock_reserve(__pa(_text), _end - _text);
169 #ifdef CONFIG_BLK_DEV_INITRD
170 if (initrd_start)
171 memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
172 #endif
173
174 early_init_fdt_scan_reserved_mem();
175
176 /* 4GB maximum for 32-bit only capable devices */
177 if (IS_ENABLED(CONFIG_ZONE_DMA))
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);
182
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
194 early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT);
195
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
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 */
266 prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size),
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 {
284 swiotlb_init(1);
285
286 set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
287
288 #ifndef CONFIG_SPARSEMEM_VMEMMAP
289 free_unused_memmap();
290 #endif
291 /* this will put all unused low memory onto the freelists */
292 free_all_bootmem();
293
294 mem_init_print_info(NULL);
295
296 #define MLK(b, t) b, t, ((t) - (b)) >> 10
297 #define MLM(b, t) b, t, ((t) - (b)) >> 20
298 #define MLG(b, t) b, t, ((t) - (b)) >> 30
299 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
300
301 pr_notice("Virtual kernel memory layout:\n"
302 #ifdef CONFIG_KASAN
303 " kasan : 0x%16lx - 0x%16lx (%6ld GB)\n"
304 #endif
305 " vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n"
306 #ifdef CONFIG_SPARSEMEM_VMEMMAP
307 " vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n"
308 " 0x%16lx - 0x%16lx (%6ld MB actual)\n"
309 #endif
310 " fixed : 0x%16lx - 0x%16lx (%6ld KB)\n"
311 " PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n"
312 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
313 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
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",
317 #ifdef CONFIG_KASAN
318 MLG(KASAN_SHADOW_START, KASAN_SHADOW_END),
319 #endif
320 MLG(VMALLOC_START, VMALLOC_END),
321 #ifdef CONFIG_SPARSEMEM_VMEMMAP
322 MLG((unsigned long)vmemmap,
323 (unsigned long)vmemmap + VMEMMAP_SIZE),
324 MLM((unsigned long)virt_to_page(PAGE_OFFSET),
325 (unsigned long)virt_to_page(high_memory)),
326 #endif
327 MLK(FIXADDR_START, FIXADDR_TOP),
328 MLM(PCI_IO_START, PCI_IO_END),
329 MLM(MODULES_VADDR, MODULES_END),
330 MLM(PAGE_OFFSET, (unsigned long)high_memory),
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
349 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
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 {
361 fixup_init();
362 free_initmem_default(0);
363 }
364
365 #ifdef CONFIG_BLK_DEV_INITRD
366
367 static int keep_initrd __initdata;
368
369 void __init free_initrd_mem(unsigned long start, unsigned long end)
370 {
371 if (!keep_initrd)
372 free_reserved_area((void *)start, (void *)end, 0, "initrd");
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