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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 Marinas19e76402014-02-27 12:09:22 +000033#include <linux/dma-mapping.h>
Laura Abbott6ac21042013-12-12 19:28:33 +000034#include <linux/dma-contiguous.h>
Leif Lindholm86c8b272014-07-28 19:03:03 +010035#include <linux/efi.h>
Catalin Marinasc1cc1552012-03-05 11:49:27 +000036
Catalin Marinas08375192014-07-16 17:42:43 +010037#include <asm/fixmap.h>
Catalin Marinasc1cc1552012-03-05 11:49:27 +000038#include <asm/sections.h>
39#include <asm/setup.h>
40#include <asm/sizes.h>
41#include <asm/tlb.h>
42
43#include "mm.h"
44
Catalin Marinasc1cc1552012-03-05 11:49:27 +000045phys_addr_t memstart_addr __read_mostly = 0;
46
Rob Herringec2eaa72013-08-25 16:47:48 -050047#ifdef CONFIG_BLK_DEV_INITRD
Catalin Marinasc1cc1552012-03-05 11:49:27 +000048static int __init early_initrd(char *p)
49{
50 unsigned long start, size;
51 char *endp;
52
53 start = memparse(p, &endp);
54 if (*endp == ',') {
55 size = memparse(endp + 1, NULL);
56
Rob Herringec2eaa72013-08-25 16:47:48 -050057 initrd_start = (unsigned long)__va(start);
58 initrd_end = (unsigned long)__va(start + size);
Catalin Marinasc1cc1552012-03-05 11:49:27 +000059 }
60 return 0;
61}
62early_param("initrd", early_initrd);
Rob Herringec2eaa72013-08-25 16:47:48 -050063#endif
Catalin Marinasc1cc1552012-03-05 11:49:27 +000064
Catalin Marinasd50314a2014-07-18 11:54:37 +010065/*
66 * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
67 * currently assumes that for memory starting above 4G, 32-bit devices will
68 * use a DMA offset.
69 */
70static phys_addr_t max_zone_dma_phys(void)
71{
72 phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
73 return min(offset + (1ULL << 32), memblock_end_of_DRAM());
74}
75
Catalin Marinasc1cc1552012-03-05 11:49:27 +000076static void __init zone_sizes_init(unsigned long min, unsigned long max)
77{
78 struct memblock_region *reg;
79 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
Catalin Marinas19e76402014-02-27 12:09:22 +000080 unsigned long max_dma = min;
Catalin Marinasc1cc1552012-03-05 11:49:27 +000081
82 memset(zone_size, 0, sizeof(zone_size));
83
Catalin Marinasc1cc1552012-03-05 11:49:27 +000084 /* 4GB maximum for 32-bit only capable devices */
Catalin Marinas19e76402014-02-27 12:09:22 +000085 if (IS_ENABLED(CONFIG_ZONE_DMA)) {
Catalin Marinasd50314a2014-07-18 11:54:37 +010086 max_dma = PFN_DOWN(max_zone_dma_phys());
Catalin Marinas19e76402014-02-27 12:09:22 +000087 zone_size[ZONE_DMA] = max_dma - min;
88 }
89 zone_size[ZONE_NORMAL] = max - max_dma;
Catalin Marinasc1cc1552012-03-05 11:49:27 +000090
91 memcpy(zhole_size, zone_size, sizeof(zhole_size));
92
93 for_each_memblock(memory, reg) {
94 unsigned long start = memblock_region_memory_base_pfn(reg);
95 unsigned long end = memblock_region_memory_end_pfn(reg);
96
97 if (start >= max)
98 continue;
Catalin Marinas19e76402014-02-27 12:09:22 +000099
100 if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
101 unsigned long dma_end = min(end, max_dma);
102 zhole_size[ZONE_DMA] -= dma_end - start;
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000103 }
Catalin Marinas19e76402014-02-27 12:09:22 +0000104
105 if (end > max_dma) {
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000106 unsigned long normal_end = min(end, max);
Catalin Marinas19e76402014-02-27 12:09:22 +0000107 unsigned long normal_start = max(start, max_dma);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000108 zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
109 }
110 }
111
112 free_area_init_node(0, zone_size, min, zhole_size);
113}
114
115#ifdef CONFIG_HAVE_ARCH_PFN_VALID
116int pfn_valid(unsigned long pfn)
117{
118 return memblock_is_memory(pfn << PAGE_SHIFT);
119}
120EXPORT_SYMBOL(pfn_valid);
121#endif
122
123#ifndef CONFIG_SPARSEMEM
124static void arm64_memory_present(void)
125{
126}
127#else
128static void arm64_memory_present(void)
129{
130 struct memblock_region *reg;
131
132 for_each_memblock(memory, reg)
133 memory_present(0, memblock_region_memory_base_pfn(reg),
134 memblock_region_memory_end_pfn(reg));
135}
136#endif
137
138void __init arm64_memblock_init(void)
139{
Catalin Marinas2d5a5612014-06-13 13:41:20 +0100140 phys_addr_t dma_phys_limit = 0;
141
Mark Rutlandbd00cd52014-06-24 16:51:35 +0100142 /*
143 * Register the kernel text, kernel data, initrd, and initial
144 * pagetables with memblock.
145 */
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000146 memblock_reserve(__pa(_text), _end - _text);
147#ifdef CONFIG_BLK_DEV_INITRD
Rob Herringec2eaa72013-08-25 16:47:48 -0500148 if (initrd_start)
149 memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000150#endif
151
Mark Salter0ceac9e2014-09-08 13:01:08 -0400152 early_init_fdt_scan_reserved_mem();
Catalin Marinas2d5a5612014-06-13 13:41:20 +0100153
154 /* 4GB maximum for 32-bit only capable devices */
155 if (IS_ENABLED(CONFIG_ZONE_DMA))
Catalin Marinasd50314a2014-07-18 11:54:37 +0100156 dma_phys_limit = max_zone_dma_phys();
Catalin Marinas2d5a5612014-06-13 13:41:20 +0100157 dma_contiguous_reserve(dma_phys_limit);
Laura Abbott6ac21042013-12-12 19:28:33 +0000158
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000159 memblock_allow_resize();
160 memblock_dump_all();
161}
162
163void __init bootmem_init(void)
164{
165 unsigned long min, max;
166
167 min = PFN_UP(memblock_start_of_DRAM());
168 max = PFN_DOWN(memblock_end_of_DRAM());
169
170 /*
171 * Sparsemem tries to allocate bootmem in memory_present(), so must be
172 * done after the fixed reservations.
173 */
174 arm64_memory_present();
175
176 sparse_init();
177 zone_sizes_init(min, max);
178
179 high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
180 max_pfn = max_low_pfn = max;
181}
182
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000183#ifndef CONFIG_SPARSEMEM_VMEMMAP
184static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
185{
186 struct page *start_pg, *end_pg;
187 unsigned long pg, pgend;
188
189 /*
190 * Convert start_pfn/end_pfn to a struct page pointer.
191 */
192 start_pg = pfn_to_page(start_pfn - 1) + 1;
193 end_pg = pfn_to_page(end_pfn - 1) + 1;
194
195 /*
196 * Convert to physical addresses, and round start upwards and end
197 * downwards.
198 */
199 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
200 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
201
202 /*
203 * If there are free pages between these, free the section of the
204 * memmap array.
205 */
206 if (pg < pgend)
207 free_bootmem(pg, pgend - pg);
208}
209
210/*
211 * The mem_map array can get very big. Free the unused area of the memory map.
212 */
213static void __init free_unused_memmap(void)
214{
215 unsigned long start, prev_end = 0;
216 struct memblock_region *reg;
217
218 for_each_memblock(memory, reg) {
219 start = __phys_to_pfn(reg->base);
220
221#ifdef CONFIG_SPARSEMEM
222 /*
223 * Take care not to free memmap entries that don't exist due
224 * to SPARSEMEM sections which aren't present.
225 */
226 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
227#endif
228 /*
229 * If we had a previous bank, and there is a space between the
230 * current bank and the previous, free it.
231 */
232 if (prev_end && prev_end < start)
233 free_memmap(prev_end, start);
234
235 /*
236 * Align up here since the VM subsystem insists that the
237 * memmap entries are valid from the bank end aligned to
238 * MAX_ORDER_NR_PAGES.
239 */
240 prev_end = ALIGN(start + __phys_to_pfn(reg->size),
241 MAX_ORDER_NR_PAGES);
242 }
243
244#ifdef CONFIG_SPARSEMEM
245 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
246 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
247#endif
248}
249#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
250
251/*
252 * mem_init() marks the free areas in the mem_map and tells us how much memory
253 * is free. This is done after various parts of the system have claimed their
254 * memory after the kernel image.
255 */
256void __init mem_init(void)
257{
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000258 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
259
260#ifndef CONFIG_SPARSEMEM_VMEMMAP
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000261 free_unused_memmap();
262#endif
Jiang Liubee4ebd2013-07-03 15:03:49 -0700263 /* this will put all unused low memory onto the freelists */
Jiang Liu0c988532013-07-03 15:03:24 -0700264 free_all_bootmem();
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000265
Jiang Liu6879ea82013-07-03 15:04:02 -0700266 mem_init_print_info(NULL);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000267
268#define MLK(b, t) b, t, ((t) - (b)) >> 10
269#define MLM(b, t) b, t, ((t) - (b)) >> 20
Catalin Marinas08375192014-07-16 17:42:43 +0100270#define MLG(b, t) b, t, ((t) - (b)) >> 30
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000271#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
272
273 pr_notice("Virtual kernel memory layout:\n"
Catalin Marinas08375192014-07-16 17:42:43 +0100274 " vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n"
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000275#ifdef CONFIG_SPARSEMEM_VMEMMAP
Catalin Marinas08375192014-07-16 17:42:43 +0100276 " vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n"
277 " 0x%16lx - 0x%16lx (%6ld MB actual)\n"
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000278#endif
Catalin Marinas08375192014-07-16 17:42:43 +0100279 " PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n"
280 " fixed : 0x%16lx - 0x%16lx (%6ld KB)\n"
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000281 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
282 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
Catalin Marinas08375192014-07-16 17:42:43 +0100283 " .init : 0x%p" " - 0x%p" " (%6ld KB)\n"
284 " .text : 0x%p" " - 0x%p" " (%6ld KB)\n"
285 " .data : 0x%p" " - 0x%p" " (%6ld KB)\n",
286 MLG(VMALLOC_START, VMALLOC_END),
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000287#ifdef CONFIG_SPARSEMEM_VMEMMAP
Catalin Marinas08375192014-07-16 17:42:43 +0100288 MLG((unsigned long)vmemmap,
289 (unsigned long)vmemmap + VMEMMAP_SIZE),
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000290 MLM((unsigned long)virt_to_page(PAGE_OFFSET),
291 (unsigned long)virt_to_page(high_memory)),
292#endif
Catalin Marinas08375192014-07-16 17:42:43 +0100293 MLM((unsigned long)PCI_IOBASE, (unsigned long)PCI_IOBASE + SZ_16M),
294 MLK(FIXADDR_START, FIXADDR_TOP),
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000295 MLM(MODULES_VADDR, MODULES_END),
296 MLM(PAGE_OFFSET, (unsigned long)high_memory),
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000297 MLK_ROUNDUP(__init_begin, __init_end),
298 MLK_ROUNDUP(_text, _etext),
299 MLK_ROUNDUP(_sdata, _edata));
300
301#undef MLK
302#undef MLM
303#undef MLK_ROUNDUP
304
305 /*
306 * Check boundaries twice: Some fundamental inconsistencies can be
307 * detected at build time already.
308 */
309#ifdef CONFIG_COMPAT
310 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
311#endif
312 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
313 BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
314
Jiang Liubee4ebd2013-07-03 15:03:49 -0700315 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000316 extern int sysctl_overcommit_memory;
317 /*
318 * On a machine this small we won't get anywhere without
319 * overcommit, so turn it on by default.
320 */
321 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
322 }
323}
324
325void free_initmem(void)
326{
Jiang Liu9af5b802013-07-03 15:02:54 -0700327 free_initmem_default(0);
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000328}
329
330#ifdef CONFIG_BLK_DEV_INITRD
331
332static int keep_initrd;
333
334void free_initrd_mem(unsigned long start, unsigned long end)
335{
Jiang Liu9af5b802013-07-03 15:02:54 -0700336 if (!keep_initrd)
337 free_reserved_area((void *)start, (void *)end, 0, "initrd");
Catalin Marinasc1cc1552012-03-05 11:49:27 +0000338}
339
340static int __init keepinitrd_setup(char *__unused)
341{
342 keep_initrd = 1;
343 return 1;
344}
345
346__setup("keepinitrd", keepinitrd_setup);
347#endif