blob: 6757d02d697631ebc8c4a9d9aed9e800c2975b51 [file] [log] [blame]
Catalin Marinasc1cc1552012-03-05 11:49:27 +00001/*
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>
Catalin Marinasf44acdf2014-05-09 15:58:17 +010033#include <linux/dma-mapping.h>
Laura Abbott97e4a882013-12-12 19:28:33 +000034#include <linux/dma-contiguous.h>
Catalin Marinasc1cc1552012-03-05 11:49:27 +000035
36#include <asm/prom.h>
37#include <asm/sections.h>
38#include <asm/setup.h>
39#include <asm/sizes.h>
40#include <asm/tlb.h>
41
42#include "mm.h"
43
44static unsigned long phys_initrd_start __initdata = 0;
45static unsigned long phys_initrd_size __initdata = 0;
46
47phys_addr_t memstart_addr __read_mostly = 0;
48
Santosh Shilimkar9a87b8d2013-07-01 14:20:35 -040049void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
Catalin Marinasc1cc1552012-03-05 11:49:27 +000050{
51 phys_initrd_start = start;
52 phys_initrd_size = end - start;
53}
54
55static int __init early_initrd(char *p)
56{
57 unsigned long start, size;
58 char *endp;
59
60 start = memparse(p, &endp);
61 if (*endp == ',') {
62 size = memparse(endp + 1, NULL);
63
64 phys_initrd_start = start;
65 phys_initrd_size = size;
66 }
67 return 0;
68}
69early_param("initrd", early_initrd);
70
Catalin Marinas34c66832014-07-18 11:54:37 +010071/*
72 * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
73 * currently assumes that for memory starting above 4G, 32-bit devices will
74 * use a DMA offset.
75 */
76static phys_addr_t max_zone_dma_phys(void)
77{
78 phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
79 return min(offset + (1ULL << 32), memblock_end_of_DRAM());
80}
81
Catalin Marinasc1cc1552012-03-05 11:49:27 +000082static void __init zone_sizes_init(unsigned long min, unsigned long max)
83{
84 struct memblock_region *reg;
85 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
Catalin Marinasf44acdf2014-05-09 15:58:17 +010086 unsigned long max_dma = min;
Catalin Marinasc1cc1552012-03-05 11:49:27 +000087
88 memset(zone_size, 0, sizeof(zone_size));
89
Catalin Marinasc1cc1552012-03-05 11:49:27 +000090 /* 4GB maximum for 32-bit only capable devices */
Catalin Marinasf44acdf2014-05-09 15:58:17 +010091 if (IS_ENABLED(CONFIG_ZONE_DMA)) {
Catalin Marinas34c66832014-07-18 11:54:37 +010092 max_dma = PFN_DOWN(max_zone_dma_phys());
Catalin Marinasf44acdf2014-05-09 15:58:17 +010093 zone_size[ZONE_DMA] = max_dma - min;
94 }
95 zone_size[ZONE_NORMAL] = max - max_dma;
Catalin Marinasc1cc1552012-03-05 11:49:27 +000096
97 memcpy(zhole_size, zone_size, sizeof(zhole_size));
98
99 for_each_memblock(memory, reg) {
100 unsigned long start = memblock_region_memory_base_pfn(reg);
101 unsigned long end = memblock_region_memory_end_pfn(reg);
102
103 if (start >= max)
104 continue;
Catalin Marinasf44acdf2014-05-09 15:58:17 +0100105
106 if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
107 unsigned long dma_end = min(end, max_dma);
108 zhole_size[ZONE_DMA] -= dma_end - start;
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000109 }
Catalin Marinasf44acdf2014-05-09 15:58:17 +0100110
111 if (end > max_dma) {
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000112 unsigned long normal_end = min(end, max);
Catalin Marinasf44acdf2014-05-09 15:58:17 +0100113 unsigned long normal_start = max(start, max_dma);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000114 zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
115 }
116 }
117
118 free_area_init_node(0, zone_size, min, zhole_size);
119}
120
121#ifdef CONFIG_HAVE_ARCH_PFN_VALID
122int pfn_valid(unsigned long pfn)
123{
124 return memblock_is_memory(pfn << PAGE_SHIFT);
125}
126EXPORT_SYMBOL(pfn_valid);
127#endif
128
129#ifndef CONFIG_SPARSEMEM
130static void arm64_memory_present(void)
131{
132}
133#else
134static void arm64_memory_present(void)
135{
136 struct memblock_region *reg;
137
138 for_each_memblock(memory, reg)
139 memory_present(0, memblock_region_memory_base_pfn(reg),
140 memblock_region_memory_end_pfn(reg));
141}
142#endif
143
144void __init arm64_memblock_init(void)
145{
146 u64 *reserve_map, base, size;
147
Mark Rutland0c0ec282014-06-24 16:51:35 +0100148 /*
149 * Register the kernel text, kernel data, initrd, and initial
150 * pagetables with memblock.
151 */
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000152 memblock_reserve(__pa(_text), _end - _text);
153#ifdef CONFIG_BLK_DEV_INITRD
154 if (phys_initrd_size) {
155 memblock_reserve(phys_initrd_start, phys_initrd_size);
156
157 /* Now convert initrd to virtual addresses */
158 initrd_start = __phys_to_virt(phys_initrd_start);
159 initrd_end = initrd_start + phys_initrd_size;
160 }
161#endif
162
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000163 /* Reserve the dtb region */
164 memblock_reserve(virt_to_phys(initial_boot_params),
165 be32_to_cpu(initial_boot_params->totalsize));
166
167 /*
168 * Process the reserve map. This will probably overlap the initrd
169 * and dtb locations which are already reserved, but overlapping
170 * doesn't hurt anything
171 */
172 reserve_map = ((void*)initial_boot_params) +
173 be32_to_cpu(initial_boot_params->off_mem_rsvmap);
174 while (1) {
175 base = be64_to_cpup(reserve_map++);
176 size = be64_to_cpup(reserve_map++);
177 if (!size)
178 break;
179 memblock_reserve(base, size);
180 }
181
Marek Szyprowski91e8ffa2014-02-28 14:42:55 +0100182 early_init_fdt_scan_reserved_mem();
Catalin Marinas34c66832014-07-18 11:54:37 +0100183
184 /* 4GB maximum for 32-bit only capable devices */
185 if (IS_ENABLED(CONFIG_ZONE_DMA))
186 dma_phys_limit = max_zone_dma_phys();
187 dma_contiguous_reserve(dma_phys_limit);
Laura Abbott97e4a882013-12-12 19:28:33 +0000188
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000189 memblock_allow_resize();
190 memblock_dump_all();
191}
192
193void __init bootmem_init(void)
194{
195 unsigned long min, max;
196
197 min = PFN_UP(memblock_start_of_DRAM());
198 max = PFN_DOWN(memblock_end_of_DRAM());
199
200 /*
201 * Sparsemem tries to allocate bootmem in memory_present(), so must be
202 * done after the fixed reservations.
203 */
204 arm64_memory_present();
205
206 sparse_init();
207 zone_sizes_init(min, max);
208
209 high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
210 max_pfn = max_low_pfn = max;
211}
212
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000213/*
214 * Poison init memory with an undefined instruction (0x0).
215 */
216static inline void poison_init_mem(void *s, size_t count)
217{
218 memset(s, 0, count);
219}
220
221#ifndef CONFIG_SPARSEMEM_VMEMMAP
222static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
223{
224 struct page *start_pg, *end_pg;
225 unsigned long pg, pgend;
226
227 /*
228 * Convert start_pfn/end_pfn to a struct page pointer.
229 */
230 start_pg = pfn_to_page(start_pfn - 1) + 1;
231 end_pg = pfn_to_page(end_pfn - 1) + 1;
232
233 /*
234 * Convert to physical addresses, and round start upwards and end
235 * downwards.
236 */
237 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
238 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
239
240 /*
241 * If there are free pages between these, free the section of the
242 * memmap array.
243 */
244 if (pg < pgend)
245 free_bootmem(pg, pgend - pg);
246}
247
248/*
249 * The mem_map array can get very big. Free the unused area of the memory map.
250 */
251static void __init free_unused_memmap(void)
252{
253 unsigned long start, prev_end = 0;
254 struct memblock_region *reg;
255
256 for_each_memblock(memory, reg) {
257 start = __phys_to_pfn(reg->base);
258
259#ifdef CONFIG_SPARSEMEM
260 /*
261 * Take care not to free memmap entries that don't exist due
262 * to SPARSEMEM sections which aren't present.
263 */
264 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
265#endif
266 /*
267 * If we had a previous bank, and there is a space between the
268 * current bank and the previous, free it.
269 */
270 if (prev_end && prev_end < start)
271 free_memmap(prev_end, start);
272
273 /*
274 * Align up here since the VM subsystem insists that the
275 * memmap entries are valid from the bank end aligned to
276 * MAX_ORDER_NR_PAGES.
277 */
278 prev_end = ALIGN(start + __phys_to_pfn(reg->size),
279 MAX_ORDER_NR_PAGES);
280 }
281
282#ifdef CONFIG_SPARSEMEM
283 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
284 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
285#endif
286}
287#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
288
289/*
290 * mem_init() marks the free areas in the mem_map and tells us how much memory
291 * is free. This is done after various parts of the system have claimed their
292 * memory after the kernel image.
293 */
294void __init mem_init(void)
295{
296 unsigned long reserved_pages, free_pages;
297 struct memblock_region *reg;
298
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000299 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
300
301#ifndef CONFIG_SPARSEMEM_VMEMMAP
302 /* this will put all unused low memory onto the freelists */
303 free_unused_memmap();
304#endif
305
306 totalram_pages += free_all_bootmem();
307
308 reserved_pages = free_pages = 0;
309
310 for_each_memblock(memory, reg) {
311 unsigned int pfn1, pfn2;
312 struct page *page, *end;
313
314 pfn1 = __phys_to_pfn(reg->base);
315 pfn2 = pfn1 + __phys_to_pfn(reg->size);
316
317 page = pfn_to_page(pfn1);
318 end = pfn_to_page(pfn2 - 1) + 1;
319
320 do {
321 if (PageReserved(page))
322 reserved_pages++;
323 else if (!page_count(page))
324 free_pages++;
325 page++;
326 } while (page < end);
327 }
328
329 /*
330 * Since our memory may not be contiguous, calculate the real number
331 * of pages we have in this system.
332 */
333 pr_info("Memory:");
334 num_physpages = 0;
335 for_each_memblock(memory, reg) {
336 unsigned long pages = memblock_region_memory_end_pfn(reg) -
337 memblock_region_memory_base_pfn(reg);
338 num_physpages += pages;
339 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
340 }
341 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
342
343 pr_notice("Memory: %luk/%luk available, %luk reserved\n",
344 nr_free_pages() << (PAGE_SHIFT-10),
345 free_pages << (PAGE_SHIFT-10),
346 reserved_pages << (PAGE_SHIFT-10));
347
348#define MLK(b, t) b, t, ((t) - (b)) >> 10
349#define MLM(b, t) b, t, ((t) - (b)) >> 20
350#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
351
352 pr_notice("Virtual kernel memory layout:\n"
353 " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n"
354#ifdef CONFIG_SPARSEMEM_VMEMMAP
355 " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n"
356#endif
357 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
358 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
359 " .init : 0x%p" " - 0x%p" " (%6ld kB)\n"
360 " .text : 0x%p" " - 0x%p" " (%6ld kB)\n"
361 " .data : 0x%p" " - 0x%p" " (%6ld kB)\n",
362 MLM(VMALLOC_START, VMALLOC_END),
363#ifdef CONFIG_SPARSEMEM_VMEMMAP
364 MLM((unsigned long)virt_to_page(PAGE_OFFSET),
365 (unsigned long)virt_to_page(high_memory)),
366#endif
367 MLM(MODULES_VADDR, MODULES_END),
368 MLM(PAGE_OFFSET, (unsigned long)high_memory),
369
370 MLK_ROUNDUP(__init_begin, __init_end),
371 MLK_ROUNDUP(_text, _etext),
372 MLK_ROUNDUP(_sdata, _edata));
373
374#undef MLK
375#undef MLM
376#undef MLK_ROUNDUP
377
378 /*
379 * Check boundaries twice: Some fundamental inconsistencies can be
380 * detected at build time already.
381 */
382#ifdef CONFIG_COMPAT
383 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
384#endif
385 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
386 BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
387
388 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
389 extern int sysctl_overcommit_memory;
390 /*
391 * On a machine this small we won't get anywhere without
392 * overcommit, so turn it on by default.
393 */
394 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
395 }
396}
397
398void free_initmem(void)
399{
400 poison_init_mem(__init_begin, __init_end - __init_begin);
Jiang Liu83db0382013-04-29 15:06:26 -0700401 free_initmem_default(0);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000402}
403
404#ifdef CONFIG_BLK_DEV_INITRD
405
406static int keep_initrd;
407
408void free_initrd_mem(unsigned long start, unsigned long end)
409{
410 if (!keep_initrd) {
411 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
Jiang Liu83db0382013-04-29 15:06:26 -0700412 free_reserved_area(start, end, 0, "initrd");
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000413 }
414}
415
416static int __init keepinitrd_setup(char *__unused)
417{
418 keep_initrd = 1;
419 return 1;
420}
421
422__setup("keepinitrd", keepinitrd_setup);
423#endif