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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 Marinasc1cc1552012-03-05 11:49:27 +000071static void __init zone_sizes_init(unsigned long min, unsigned long max)
72{
73 struct memblock_region *reg;
74 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
Catalin Marinasf44acdf2014-05-09 15:58:17 +010075 unsigned long max_dma = min;
Catalin Marinasc1cc1552012-03-05 11:49:27 +000076
77 memset(zone_size, 0, sizeof(zone_size));
78
Catalin Marinasc1cc1552012-03-05 11:49:27 +000079 /* 4GB maximum for 32-bit only capable devices */
Catalin Marinasf44acdf2014-05-09 15:58:17 +010080 if (IS_ENABLED(CONFIG_ZONE_DMA)) {
81 unsigned long max_dma_phys =
82 (unsigned long)dma_to_phys(NULL, DMA_BIT_MASK(32) + 1);
83 max_dma = max(min, min(max, max_dma_phys >> PAGE_SHIFT));
84 zone_size[ZONE_DMA] = max_dma - min;
85 }
86 zone_size[ZONE_NORMAL] = max - max_dma;
Catalin Marinasc1cc1552012-03-05 11:49:27 +000087
88 memcpy(zhole_size, zone_size, sizeof(zhole_size));
89
90 for_each_memblock(memory, reg) {
91 unsigned long start = memblock_region_memory_base_pfn(reg);
92 unsigned long end = memblock_region_memory_end_pfn(reg);
93
94 if (start >= max)
95 continue;
Catalin Marinasf44acdf2014-05-09 15:58:17 +010096
97 if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
98 unsigned long dma_end = min(end, max_dma);
99 zhole_size[ZONE_DMA] -= dma_end - start;
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000100 }
Catalin Marinasf44acdf2014-05-09 15:58:17 +0100101
102 if (end > max_dma) {
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000103 unsigned long normal_end = min(end, max);
Catalin Marinasf44acdf2014-05-09 15:58:17 +0100104 unsigned long normal_start = max(start, max_dma);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000105 zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
106 }
107 }
108
109 free_area_init_node(0, zone_size, min, zhole_size);
110}
111
112#ifdef CONFIG_HAVE_ARCH_PFN_VALID
113int pfn_valid(unsigned long pfn)
114{
115 return memblock_is_memory(pfn << PAGE_SHIFT);
116}
117EXPORT_SYMBOL(pfn_valid);
118#endif
119
120#ifndef CONFIG_SPARSEMEM
121static void arm64_memory_present(void)
122{
123}
124#else
125static void arm64_memory_present(void)
126{
127 struct memblock_region *reg;
128
129 for_each_memblock(memory, reg)
130 memory_present(0, memblock_region_memory_base_pfn(reg),
131 memblock_region_memory_end_pfn(reg));
132}
133#endif
134
135void __init arm64_memblock_init(void)
136{
137 u64 *reserve_map, base, size;
138
Mark Rutland0c0ec282014-06-24 16:51:35 +0100139 /*
140 * Register the kernel text, kernel data, initrd, and initial
141 * pagetables with memblock.
142 */
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000143 memblock_reserve(__pa(_text), _end - _text);
144#ifdef CONFIG_BLK_DEV_INITRD
145 if (phys_initrd_size) {
146 memblock_reserve(phys_initrd_start, phys_initrd_size);
147
148 /* Now convert initrd to virtual addresses */
149 initrd_start = __phys_to_virt(phys_initrd_start);
150 initrd_end = initrd_start + phys_initrd_size;
151 }
152#endif
153
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000154 /* Reserve the dtb region */
155 memblock_reserve(virt_to_phys(initial_boot_params),
156 be32_to_cpu(initial_boot_params->totalsize));
157
158 /*
159 * Process the reserve map. This will probably overlap the initrd
160 * and dtb locations which are already reserved, but overlapping
161 * doesn't hurt anything
162 */
163 reserve_map = ((void*)initial_boot_params) +
164 be32_to_cpu(initial_boot_params->off_mem_rsvmap);
165 while (1) {
166 base = be64_to_cpup(reserve_map++);
167 size = be64_to_cpup(reserve_map++);
168 if (!size)
169 break;
170 memblock_reserve(base, size);
171 }
172
Laura Abbott97e4a882013-12-12 19:28:33 +0000173 dma_contiguous_reserve(0);
174
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000175 memblock_allow_resize();
176 memblock_dump_all();
177}
178
179void __init bootmem_init(void)
180{
181 unsigned long min, max;
182
183 min = PFN_UP(memblock_start_of_DRAM());
184 max = PFN_DOWN(memblock_end_of_DRAM());
185
186 /*
187 * Sparsemem tries to allocate bootmem in memory_present(), so must be
188 * done after the fixed reservations.
189 */
190 arm64_memory_present();
191
192 sparse_init();
193 zone_sizes_init(min, max);
194
195 high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
196 max_pfn = max_low_pfn = max;
197}
198
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000199/*
200 * Poison init memory with an undefined instruction (0x0).
201 */
202static inline void poison_init_mem(void *s, size_t count)
203{
204 memset(s, 0, count);
205}
206
207#ifndef CONFIG_SPARSEMEM_VMEMMAP
208static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
209{
210 struct page *start_pg, *end_pg;
211 unsigned long pg, pgend;
212
213 /*
214 * Convert start_pfn/end_pfn to a struct page pointer.
215 */
216 start_pg = pfn_to_page(start_pfn - 1) + 1;
217 end_pg = pfn_to_page(end_pfn - 1) + 1;
218
219 /*
220 * Convert to physical addresses, and round start upwards and end
221 * downwards.
222 */
223 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
224 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
225
226 /*
227 * If there are free pages between these, free the section of the
228 * memmap array.
229 */
230 if (pg < pgend)
231 free_bootmem(pg, pgend - pg);
232}
233
234/*
235 * The mem_map array can get very big. Free the unused area of the memory map.
236 */
237static void __init free_unused_memmap(void)
238{
239 unsigned long start, prev_end = 0;
240 struct memblock_region *reg;
241
242 for_each_memblock(memory, reg) {
243 start = __phys_to_pfn(reg->base);
244
245#ifdef CONFIG_SPARSEMEM
246 /*
247 * Take care not to free memmap entries that don't exist due
248 * to SPARSEMEM sections which aren't present.
249 */
250 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
251#endif
252 /*
253 * If we had a previous bank, and there is a space between the
254 * current bank and the previous, free it.
255 */
256 if (prev_end && prev_end < start)
257 free_memmap(prev_end, start);
258
259 /*
260 * Align up here since the VM subsystem insists that the
261 * memmap entries are valid from the bank end aligned to
262 * MAX_ORDER_NR_PAGES.
263 */
264 prev_end = ALIGN(start + __phys_to_pfn(reg->size),
265 MAX_ORDER_NR_PAGES);
266 }
267
268#ifdef CONFIG_SPARSEMEM
269 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
270 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
271#endif
272}
273#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
274
275/*
276 * mem_init() marks the free areas in the mem_map and tells us how much memory
277 * is free. This is done after various parts of the system have claimed their
278 * memory after the kernel image.
279 */
280void __init mem_init(void)
281{
282 unsigned long reserved_pages, free_pages;
283 struct memblock_region *reg;
284
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000285 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
286
287#ifndef CONFIG_SPARSEMEM_VMEMMAP
288 /* this will put all unused low memory onto the freelists */
289 free_unused_memmap();
290#endif
291
292 totalram_pages += free_all_bootmem();
293
294 reserved_pages = free_pages = 0;
295
296 for_each_memblock(memory, reg) {
297 unsigned int pfn1, pfn2;
298 struct page *page, *end;
299
300 pfn1 = __phys_to_pfn(reg->base);
301 pfn2 = pfn1 + __phys_to_pfn(reg->size);
302
303 page = pfn_to_page(pfn1);
304 end = pfn_to_page(pfn2 - 1) + 1;
305
306 do {
307 if (PageReserved(page))
308 reserved_pages++;
309 else if (!page_count(page))
310 free_pages++;
311 page++;
312 } while (page < end);
313 }
314
315 /*
316 * Since our memory may not be contiguous, calculate the real number
317 * of pages we have in this system.
318 */
319 pr_info("Memory:");
320 num_physpages = 0;
321 for_each_memblock(memory, reg) {
322 unsigned long pages = memblock_region_memory_end_pfn(reg) -
323 memblock_region_memory_base_pfn(reg);
324 num_physpages += pages;
325 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
326 }
327 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
328
329 pr_notice("Memory: %luk/%luk available, %luk reserved\n",
330 nr_free_pages() << (PAGE_SHIFT-10),
331 free_pages << (PAGE_SHIFT-10),
332 reserved_pages << (PAGE_SHIFT-10));
333
334#define MLK(b, t) b, t, ((t) - (b)) >> 10
335#define MLM(b, t) b, t, ((t) - (b)) >> 20
336#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
337
338 pr_notice("Virtual kernel memory layout:\n"
339 " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n"
340#ifdef CONFIG_SPARSEMEM_VMEMMAP
341 " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n"
342#endif
343 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
344 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
345 " .init : 0x%p" " - 0x%p" " (%6ld kB)\n"
346 " .text : 0x%p" " - 0x%p" " (%6ld kB)\n"
347 " .data : 0x%p" " - 0x%p" " (%6ld kB)\n",
348 MLM(VMALLOC_START, VMALLOC_END),
349#ifdef CONFIG_SPARSEMEM_VMEMMAP
350 MLM((unsigned long)virt_to_page(PAGE_OFFSET),
351 (unsigned long)virt_to_page(high_memory)),
352#endif
353 MLM(MODULES_VADDR, MODULES_END),
354 MLM(PAGE_OFFSET, (unsigned long)high_memory),
355
356 MLK_ROUNDUP(__init_begin, __init_end),
357 MLK_ROUNDUP(_text, _etext),
358 MLK_ROUNDUP(_sdata, _edata));
359
360#undef MLK
361#undef MLM
362#undef MLK_ROUNDUP
363
364 /*
365 * Check boundaries twice: Some fundamental inconsistencies can be
366 * detected at build time already.
367 */
368#ifdef CONFIG_COMPAT
369 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
370#endif
371 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
372 BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
373
374 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
375 extern int sysctl_overcommit_memory;
376 /*
377 * On a machine this small we won't get anywhere without
378 * overcommit, so turn it on by default.
379 */
380 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
381 }
382}
383
384void free_initmem(void)
385{
386 poison_init_mem(__init_begin, __init_end - __init_begin);
Jiang Liu83db0382013-04-29 15:06:26 -0700387 free_initmem_default(0);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000388}
389
390#ifdef CONFIG_BLK_DEV_INITRD
391
392static int keep_initrd;
393
394void free_initrd_mem(unsigned long start, unsigned long end)
395{
396 if (!keep_initrd) {
397 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
Jiang Liu83db0382013-04-29 15:06:26 -0700398 free_reserved_area(start, end, 0, "initrd");
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000399 }
400}
401
402static int __init keepinitrd_setup(char *__unused)
403{
404 keep_initrd = 1;
405 return 1;
406}
407
408__setup("keepinitrd", keepinitrd_setup);
409#endif