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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
49void __init early_init_dt_setup_initrd_arch(unsigned long start,
50 unsigned long end)
51{
52 phys_initrd_start = start;
53 phys_initrd_size = end - start;
54}
55
56static int __init early_initrd(char *p)
57{
58 unsigned long start, size;
59 char *endp;
60
61 start = memparse(p, &endp);
62 if (*endp == ',') {
63 size = memparse(endp + 1, NULL);
64
65 phys_initrd_start = start;
66 phys_initrd_size = size;
67 }
68 return 0;
69}
70early_param("initrd", early_initrd);
71
Catalin Marinasc1cc1552012-03-05 11:49:27 +000072static void __init zone_sizes_init(unsigned long min, unsigned long max)
73{
74 struct memblock_region *reg;
75 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
Catalin Marinasf44acdf2014-05-09 15:58:17 +010076 unsigned long max_dma = min;
Catalin Marinasc1cc1552012-03-05 11:49:27 +000077
78 memset(zone_size, 0, sizeof(zone_size));
79
Catalin Marinasc1cc1552012-03-05 11:49:27 +000080 /* 4GB maximum for 32-bit only capable devices */
Catalin Marinasf44acdf2014-05-09 15:58:17 +010081 if (IS_ENABLED(CONFIG_ZONE_DMA)) {
82 unsigned long max_dma_phys =
83 (unsigned long)dma_to_phys(NULL, DMA_BIT_MASK(32) + 1);
84 max_dma = max(min, min(max, max_dma_phys >> PAGE_SHIFT));
85 zone_size[ZONE_DMA] = max_dma - min;
86 }
87 zone_size[ZONE_NORMAL] = max - max_dma;
Catalin Marinasc1cc1552012-03-05 11:49:27 +000088
89 memcpy(zhole_size, zone_size, sizeof(zhole_size));
90
91 for_each_memblock(memory, reg) {
92 unsigned long start = memblock_region_memory_base_pfn(reg);
93 unsigned long end = memblock_region_memory_end_pfn(reg);
94
95 if (start >= max)
96 continue;
Catalin Marinasf44acdf2014-05-09 15:58:17 +010097
98 if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
99 unsigned long dma_end = min(end, max_dma);
100 zhole_size[ZONE_DMA] -= dma_end - start;
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000101 }
Catalin Marinasf44acdf2014-05-09 15:58:17 +0100102
103 if (end > max_dma) {
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000104 unsigned long normal_end = min(end, max);
Catalin Marinasf44acdf2014-05-09 15:58:17 +0100105 unsigned long normal_start = max(start, max_dma);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000106 zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
107 }
108 }
109
110 free_area_init_node(0, zone_size, min, zhole_size);
111}
112
113#ifdef CONFIG_HAVE_ARCH_PFN_VALID
114int pfn_valid(unsigned long pfn)
115{
116 return memblock_is_memory(pfn << PAGE_SHIFT);
117}
118EXPORT_SYMBOL(pfn_valid);
119#endif
120
121#ifndef CONFIG_SPARSEMEM
122static void arm64_memory_present(void)
123{
124}
125#else
126static void arm64_memory_present(void)
127{
128 struct memblock_region *reg;
129
130 for_each_memblock(memory, reg)
131 memory_present(0, memblock_region_memory_base_pfn(reg),
132 memblock_region_memory_end_pfn(reg));
133}
134#endif
135
136void __init arm64_memblock_init(void)
137{
138 u64 *reserve_map, base, size;
139
140 /* Register the kernel text, kernel data and initrd with memblock */
141 memblock_reserve(__pa(_text), _end - _text);
142#ifdef CONFIG_BLK_DEV_INITRD
143 if (phys_initrd_size) {
144 memblock_reserve(phys_initrd_start, phys_initrd_size);
145
146 /* Now convert initrd to virtual addresses */
147 initrd_start = __phys_to_virt(phys_initrd_start);
148 initrd_end = initrd_start + phys_initrd_size;
149 }
150#endif
151
152 /*
153 * Reserve the page tables. These are already in use,
154 * and can only be in node 0.
155 */
156 memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE);
157 memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);
158
159 /* Reserve the dtb region */
160 memblock_reserve(virt_to_phys(initial_boot_params),
161 be32_to_cpu(initial_boot_params->totalsize));
162
163 /*
164 * Process the reserve map. This will probably overlap the initrd
165 * and dtb locations which are already reserved, but overlapping
166 * doesn't hurt anything
167 */
168 reserve_map = ((void*)initial_boot_params) +
169 be32_to_cpu(initial_boot_params->off_mem_rsvmap);
170 while (1) {
171 base = be64_to_cpup(reserve_map++);
172 size = be64_to_cpup(reserve_map++);
173 if (!size)
174 break;
175 memblock_reserve(base, size);
176 }
177
Laura Abbott97e4a882013-12-12 19:28:33 +0000178 dma_contiguous_reserve(0);
179
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000180 memblock_allow_resize();
181 memblock_dump_all();
182}
183
184void __init bootmem_init(void)
185{
186 unsigned long min, max;
187
188 min = PFN_UP(memblock_start_of_DRAM());
189 max = PFN_DOWN(memblock_end_of_DRAM());
190
191 /*
192 * Sparsemem tries to allocate bootmem in memory_present(), so must be
193 * done after the fixed reservations.
194 */
195 arm64_memory_present();
196
197 sparse_init();
198 zone_sizes_init(min, max);
199
200 high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
201 max_pfn = max_low_pfn = max;
202}
203
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000204/*
205 * Poison init memory with an undefined instruction (0x0).
206 */
207static inline void poison_init_mem(void *s, size_t count)
208{
209 memset(s, 0, count);
210}
211
212#ifndef CONFIG_SPARSEMEM_VMEMMAP
213static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
214{
215 struct page *start_pg, *end_pg;
216 unsigned long pg, pgend;
217
218 /*
219 * Convert start_pfn/end_pfn to a struct page pointer.
220 */
221 start_pg = pfn_to_page(start_pfn - 1) + 1;
222 end_pg = pfn_to_page(end_pfn - 1) + 1;
223
224 /*
225 * Convert to physical addresses, and round start upwards and end
226 * downwards.
227 */
228 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
229 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
230
231 /*
232 * If there are free pages between these, free the section of the
233 * memmap array.
234 */
235 if (pg < pgend)
236 free_bootmem(pg, pgend - pg);
237}
238
239/*
240 * The mem_map array can get very big. Free the unused area of the memory map.
241 */
242static void __init free_unused_memmap(void)
243{
244 unsigned long start, prev_end = 0;
245 struct memblock_region *reg;
246
247 for_each_memblock(memory, reg) {
248 start = __phys_to_pfn(reg->base);
249
250#ifdef CONFIG_SPARSEMEM
251 /*
252 * Take care not to free memmap entries that don't exist due
253 * to SPARSEMEM sections which aren't present.
254 */
255 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
256#endif
257 /*
258 * If we had a previous bank, and there is a space between the
259 * current bank and the previous, free it.
260 */
261 if (prev_end && prev_end < start)
262 free_memmap(prev_end, start);
263
264 /*
265 * Align up here since the VM subsystem insists that the
266 * memmap entries are valid from the bank end aligned to
267 * MAX_ORDER_NR_PAGES.
268 */
269 prev_end = ALIGN(start + __phys_to_pfn(reg->size),
270 MAX_ORDER_NR_PAGES);
271 }
272
273#ifdef CONFIG_SPARSEMEM
274 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
275 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
276#endif
277}
278#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
279
280/*
281 * mem_init() marks the free areas in the mem_map and tells us how much memory
282 * is free. This is done after various parts of the system have claimed their
283 * memory after the kernel image.
284 */
285void __init mem_init(void)
286{
287 unsigned long reserved_pages, free_pages;
288 struct memblock_region *reg;
289
Catalin Marinas27222a32012-10-03 14:35:18 +0100290 arm64_swiotlb_init();
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000291
292 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
293
294#ifndef CONFIG_SPARSEMEM_VMEMMAP
295 /* this will put all unused low memory onto the freelists */
296 free_unused_memmap();
297#endif
298
299 totalram_pages += free_all_bootmem();
300
301 reserved_pages = free_pages = 0;
302
303 for_each_memblock(memory, reg) {
304 unsigned int pfn1, pfn2;
305 struct page *page, *end;
306
307 pfn1 = __phys_to_pfn(reg->base);
308 pfn2 = pfn1 + __phys_to_pfn(reg->size);
309
310 page = pfn_to_page(pfn1);
311 end = pfn_to_page(pfn2 - 1) + 1;
312
313 do {
314 if (PageReserved(page))
315 reserved_pages++;
316 else if (!page_count(page))
317 free_pages++;
318 page++;
319 } while (page < end);
320 }
321
322 /*
323 * Since our memory may not be contiguous, calculate the real number
324 * of pages we have in this system.
325 */
326 pr_info("Memory:");
327 num_physpages = 0;
328 for_each_memblock(memory, reg) {
329 unsigned long pages = memblock_region_memory_end_pfn(reg) -
330 memblock_region_memory_base_pfn(reg);
331 num_physpages += pages;
332 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
333 }
334 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
335
336 pr_notice("Memory: %luk/%luk available, %luk reserved\n",
337 nr_free_pages() << (PAGE_SHIFT-10),
338 free_pages << (PAGE_SHIFT-10),
339 reserved_pages << (PAGE_SHIFT-10));
340
341#define MLK(b, t) b, t, ((t) - (b)) >> 10
342#define MLM(b, t) b, t, ((t) - (b)) >> 20
343#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
344
345 pr_notice("Virtual kernel memory layout:\n"
346 " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n"
347#ifdef CONFIG_SPARSEMEM_VMEMMAP
348 " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n"
349#endif
350 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
351 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
352 " .init : 0x%p" " - 0x%p" " (%6ld kB)\n"
353 " .text : 0x%p" " - 0x%p" " (%6ld kB)\n"
354 " .data : 0x%p" " - 0x%p" " (%6ld kB)\n",
355 MLM(VMALLOC_START, VMALLOC_END),
356#ifdef CONFIG_SPARSEMEM_VMEMMAP
357 MLM((unsigned long)virt_to_page(PAGE_OFFSET),
358 (unsigned long)virt_to_page(high_memory)),
359#endif
360 MLM(MODULES_VADDR, MODULES_END),
361 MLM(PAGE_OFFSET, (unsigned long)high_memory),
362
363 MLK_ROUNDUP(__init_begin, __init_end),
364 MLK_ROUNDUP(_text, _etext),
365 MLK_ROUNDUP(_sdata, _edata));
366
367#undef MLK
368#undef MLM
369#undef MLK_ROUNDUP
370
371 /*
372 * Check boundaries twice: Some fundamental inconsistencies can be
373 * detected at build time already.
374 */
375#ifdef CONFIG_COMPAT
376 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
377#endif
378 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
379 BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
380
381 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
382 extern int sysctl_overcommit_memory;
383 /*
384 * On a machine this small we won't get anywhere without
385 * overcommit, so turn it on by default.
386 */
387 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
388 }
389}
390
391void free_initmem(void)
392{
393 poison_init_mem(__init_begin, __init_end - __init_begin);
Jiang Liu83db0382013-04-29 15:06:26 -0700394 free_initmem_default(0);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000395}
396
397#ifdef CONFIG_BLK_DEV_INITRD
398
399static int keep_initrd;
400
401void free_initrd_mem(unsigned long start, unsigned long end)
402{
403 if (!keep_initrd) {
404 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
Jiang Liu83db0382013-04-29 15:06:26 -0700405 free_reserved_area(start, end, 0, "initrd");
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000406 }
407}
408
409static int __init keepinitrd_setup(char *__unused)
410{
411 keep_initrd = 1;
412 return 1;
413}
414
415__setup("keepinitrd", keepinitrd_setup);
416#endif