2 * Based on arch/arm/mm/init.c
4 * Copyright (C) 1995-2005 Russell King
5 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
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>
34 #include <asm/sections.h>
35 #include <asm/setup.h>
36 #include <asm/sizes.h>
41 phys_addr_t memstart_addr __read_mostly = 0;
43 #ifdef CONFIG_BLK_DEV_INITRD
44 static int __init early_initrd(char *p)
46 unsigned long start, size;
49 start = memparse(p, &endp);
51 size = memparse(endp + 1, NULL);
53 initrd_start = (unsigned long)__va(start);
54 initrd_end = (unsigned long)__va(start + size);
58 early_param("initrd", early_initrd);
61 #define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT)
63 static void __init zone_sizes_init(unsigned long min, unsigned long max)
65 struct memblock_region *reg;
66 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
67 unsigned long max_dma32 = min;
69 memset(zone_size, 0, sizeof(zone_size));
71 #ifdef CONFIG_ZONE_DMA32
72 /* 4GB maximum for 32-bit only capable devices */
73 max_dma32 = max(min, min(max, MAX_DMA32_PFN));
74 zone_size[ZONE_DMA32] = max_dma32 - min;
76 zone_size[ZONE_NORMAL] = max - max_dma32;
78 memcpy(zhole_size, zone_size, sizeof(zhole_size));
80 for_each_memblock(memory, reg) {
81 unsigned long start = memblock_region_memory_base_pfn(reg);
82 unsigned long end = memblock_region_memory_end_pfn(reg);
86 #ifdef CONFIG_ZONE_DMA32
87 if (start < max_dma32) {
88 unsigned long dma_end = min(end, max_dma32);
89 zhole_size[ZONE_DMA32] -= dma_end - start;
92 if (end > max_dma32) {
93 unsigned long normal_end = min(end, max);
94 unsigned long normal_start = max(start, max_dma32);
95 zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
99 free_area_init_node(0, zone_size, min, zhole_size);
102 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
103 int pfn_valid(unsigned long pfn)
105 return memblock_is_memory(pfn << PAGE_SHIFT);
107 EXPORT_SYMBOL(pfn_valid);
110 #ifndef CONFIG_SPARSEMEM
111 static void arm64_memory_present(void)
115 static void arm64_memory_present(void)
117 struct memblock_region *reg;
119 for_each_memblock(memory, reg)
120 memory_present(0, memblock_region_memory_base_pfn(reg),
121 memblock_region_memory_end_pfn(reg));
125 void __init arm64_memblock_init(void)
127 u64 *reserve_map, base, size;
129 /* Register the kernel text, kernel data and initrd with memblock */
130 memblock_reserve(__pa(_text), _end - _text);
131 #ifdef CONFIG_BLK_DEV_INITRD
133 memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
137 * Reserve the page tables. These are already in use,
138 * and can only be in node 0.
140 memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE);
141 memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);
143 /* Reserve the dtb region */
144 memblock_reserve(virt_to_phys(initial_boot_params),
145 be32_to_cpu(initial_boot_params->totalsize));
148 * Process the reserve map. This will probably overlap the initrd
149 * and dtb locations which are already reserved, but overlapping
150 * doesn't hurt anything
152 reserve_map = ((void*)initial_boot_params) +
153 be32_to_cpu(initial_boot_params->off_mem_rsvmap);
155 base = be64_to_cpup(reserve_map++);
156 size = be64_to_cpup(reserve_map++);
159 memblock_reserve(base, size);
162 memblock_allow_resize();
166 void __init bootmem_init(void)
168 unsigned long min, max;
170 min = PFN_UP(memblock_start_of_DRAM());
171 max = PFN_DOWN(memblock_end_of_DRAM());
174 * Sparsemem tries to allocate bootmem in memory_present(), so must be
175 * done after the fixed reservations.
177 arm64_memory_present();
180 zone_sizes_init(min, max);
182 high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
183 max_pfn = max_low_pfn = max;
186 #ifndef CONFIG_SPARSEMEM_VMEMMAP
187 static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
189 struct page *start_pg, *end_pg;
190 unsigned long pg, pgend;
193 * Convert start_pfn/end_pfn to a struct page pointer.
195 start_pg = pfn_to_page(start_pfn - 1) + 1;
196 end_pg = pfn_to_page(end_pfn - 1) + 1;
199 * Convert to physical addresses, and round start upwards and end
202 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
203 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
206 * If there are free pages between these, free the section of the
210 free_bootmem(pg, pgend - pg);
214 * The mem_map array can get very big. Free the unused area of the memory map.
216 static void __init free_unused_memmap(void)
218 unsigned long start, prev_end = 0;
219 struct memblock_region *reg;
221 for_each_memblock(memory, reg) {
222 start = __phys_to_pfn(reg->base);
224 #ifdef CONFIG_SPARSEMEM
226 * Take care not to free memmap entries that don't exist due
227 * to SPARSEMEM sections which aren't present.
229 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
232 * If we had a previous bank, and there is a space between the
233 * current bank and the previous, free it.
235 if (prev_end && prev_end < start)
236 free_memmap(prev_end, start);
239 * Align up here since the VM subsystem insists that the
240 * memmap entries are valid from the bank end aligned to
241 * MAX_ORDER_NR_PAGES.
243 prev_end = ALIGN(start + __phys_to_pfn(reg->size),
247 #ifdef CONFIG_SPARSEMEM
248 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
249 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
252 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */
255 * mem_init() marks the free areas in the mem_map and tells us how much memory
256 * is free. This is done after various parts of the system have claimed their
257 * memory after the kernel image.
259 void __init mem_init(void)
261 arm64_swiotlb_init();
263 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
265 #ifndef CONFIG_SPARSEMEM_VMEMMAP
266 free_unused_memmap();
268 /* this will put all unused low memory onto the freelists */
271 mem_init_print_info(NULL);
273 #define MLK(b, t) b, t, ((t) - (b)) >> 10
274 #define MLM(b, t) b, t, ((t) - (b)) >> 20
275 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
277 pr_notice("Virtual kernel memory layout:\n"
278 " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n"
279 #ifdef CONFIG_SPARSEMEM_VMEMMAP
280 " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n"
282 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
283 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
284 " .init : 0x%p" " - 0x%p" " (%6ld kB)\n"
285 " .text : 0x%p" " - 0x%p" " (%6ld kB)\n"
286 " .data : 0x%p" " - 0x%p" " (%6ld kB)\n",
287 MLM(VMALLOC_START, VMALLOC_END),
288 #ifdef CONFIG_SPARSEMEM_VMEMMAP
289 MLM((unsigned long)virt_to_page(PAGE_OFFSET),
290 (unsigned long)virt_to_page(high_memory)),
292 MLM(MODULES_VADDR, MODULES_END),
293 MLM(PAGE_OFFSET, (unsigned long)high_memory),
295 MLK_ROUNDUP(__init_begin, __init_end),
296 MLK_ROUNDUP(_text, _etext),
297 MLK_ROUNDUP(_sdata, _edata));
304 * Check boundaries twice: Some fundamental inconsistencies can be
305 * detected at build time already.
308 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
310 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
311 BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
313 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
314 extern int sysctl_overcommit_memory;
316 * On a machine this small we won't get anywhere without
317 * overcommit, so turn it on by default.
319 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
323 void free_initmem(void)
325 free_initmem_default(0);
328 #ifdef CONFIG_BLK_DEV_INITRD
330 static int keep_initrd;
332 void free_initrd_mem(unsigned long start, unsigned long end)
335 free_reserved_area((void *)start, (void *)end, 0, "initrd");
338 static int __init keepinitrd_setup(char *__unused)
344 __setup("keepinitrd", keepinitrd_setup);