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>
33 #include <linux/dma-contiguous.h>
35 #include <asm/sections.h>
36 #include <asm/setup.h>
37 #include <asm/sizes.h>
42 phys_addr_t memstart_addr __read_mostly = 0;
44 #ifdef CONFIG_BLK_DEV_INITRD
45 static int __init early_initrd(char *p)
47 unsigned long start, size;
50 start = memparse(p, &endp);
52 size = memparse(endp + 1, NULL);
54 initrd_start = (unsigned long)__va(start);
55 initrd_end = (unsigned long)__va(start + size);
59 early_param("initrd", early_initrd);
62 #define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT)
64 static void __init zone_sizes_init(unsigned long min, unsigned long max)
66 struct memblock_region *reg;
67 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
68 unsigned long max_dma32 = min;
70 memset(zone_size, 0, sizeof(zone_size));
72 #ifdef CONFIG_ZONE_DMA32
73 /* 4GB maximum for 32-bit only capable devices */
74 max_dma32 = max(min, min(max, MAX_DMA32_PFN));
75 zone_size[ZONE_DMA32] = max_dma32 - min;
77 zone_size[ZONE_NORMAL] = max - max_dma32;
79 memcpy(zhole_size, zone_size, sizeof(zhole_size));
81 for_each_memblock(memory, reg) {
82 unsigned long start = memblock_region_memory_base_pfn(reg);
83 unsigned long end = memblock_region_memory_end_pfn(reg);
87 #ifdef CONFIG_ZONE_DMA32
88 if (start < max_dma32) {
89 unsigned long dma_end = min(end, max_dma32);
90 zhole_size[ZONE_DMA32] -= dma_end - start;
93 if (end > max_dma32) {
94 unsigned long normal_end = min(end, max);
95 unsigned long normal_start = max(start, max_dma32);
96 zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
100 free_area_init_node(0, zone_size, min, zhole_size);
103 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
104 int pfn_valid(unsigned long pfn)
106 return memblock_is_memory(pfn << PAGE_SHIFT);
108 EXPORT_SYMBOL(pfn_valid);
111 #ifndef CONFIG_SPARSEMEM
112 static void arm64_memory_present(void)
116 static void arm64_memory_present(void)
118 struct memblock_region *reg;
120 for_each_memblock(memory, reg)
121 memory_present(0, memblock_region_memory_base_pfn(reg),
122 memblock_region_memory_end_pfn(reg));
126 void __init arm64_memblock_init(void)
128 u64 *reserve_map, base, size;
130 /* Register the kernel text, kernel data and initrd with memblock */
131 memblock_reserve(__pa(_text), _end - _text);
132 #ifdef CONFIG_BLK_DEV_INITRD
134 memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
138 * Reserve the page tables. These are already in use,
139 * and can only be in node 0.
141 memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE);
142 memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);
144 /* Reserve the dtb region */
145 memblock_reserve(virt_to_phys(initial_boot_params),
146 be32_to_cpu(initial_boot_params->totalsize));
149 * Process the reserve map. This will probably overlap the initrd
150 * and dtb locations which are already reserved, but overlapping
151 * doesn't hurt anything
153 reserve_map = ((void*)initial_boot_params) +
154 be32_to_cpu(initial_boot_params->off_mem_rsvmap);
156 base = be64_to_cpup(reserve_map++);
157 size = be64_to_cpup(reserve_map++);
160 memblock_reserve(base, size);
163 early_init_fdt_scan_reserved_mem();
164 dma_contiguous_reserve(0);
166 memblock_allow_resize();
170 void __init bootmem_init(void)
172 unsigned long min, max;
174 min = PFN_UP(memblock_start_of_DRAM());
175 max = PFN_DOWN(memblock_end_of_DRAM());
178 * Sparsemem tries to allocate bootmem in memory_present(), so must be
179 * done after the fixed reservations.
181 arm64_memory_present();
184 zone_sizes_init(min, max);
186 high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
187 max_pfn = max_low_pfn = max;
190 #ifndef CONFIG_SPARSEMEM_VMEMMAP
191 static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
193 struct page *start_pg, *end_pg;
194 unsigned long pg, pgend;
197 * Convert start_pfn/end_pfn to a struct page pointer.
199 start_pg = pfn_to_page(start_pfn - 1) + 1;
200 end_pg = pfn_to_page(end_pfn - 1) + 1;
203 * Convert to physical addresses, and round start upwards and end
206 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
207 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
210 * If there are free pages between these, free the section of the
214 free_bootmem(pg, pgend - pg);
218 * The mem_map array can get very big. Free the unused area of the memory map.
220 static void __init free_unused_memmap(void)
222 unsigned long start, prev_end = 0;
223 struct memblock_region *reg;
225 for_each_memblock(memory, reg) {
226 start = __phys_to_pfn(reg->base);
228 #ifdef CONFIG_SPARSEMEM
230 * Take care not to free memmap entries that don't exist due
231 * to SPARSEMEM sections which aren't present.
233 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
236 * If we had a previous bank, and there is a space between the
237 * current bank and the previous, free it.
239 if (prev_end && prev_end < start)
240 free_memmap(prev_end, start);
243 * Align up here since the VM subsystem insists that the
244 * memmap entries are valid from the bank end aligned to
245 * MAX_ORDER_NR_PAGES.
247 prev_end = ALIGN(start + __phys_to_pfn(reg->size),
251 #ifdef CONFIG_SPARSEMEM
252 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
253 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
256 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */
259 * mem_init() marks the free areas in the mem_map and tells us how much memory
260 * is free. This is done after various parts of the system have claimed their
261 * memory after the kernel image.
263 void __init mem_init(void)
265 arm64_swiotlb_init();
267 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
269 #ifndef CONFIG_SPARSEMEM_VMEMMAP
270 free_unused_memmap();
272 /* this will put all unused low memory onto the freelists */
275 mem_init_print_info(NULL);
277 #define MLK(b, t) b, t, ((t) - (b)) >> 10
278 #define MLM(b, t) b, t, ((t) - (b)) >> 20
279 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
281 pr_notice("Virtual kernel memory layout:\n"
282 " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n"
283 #ifdef CONFIG_SPARSEMEM_VMEMMAP
284 " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n"
286 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
287 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
288 " .init : 0x%p" " - 0x%p" " (%6ld kB)\n"
289 " .text : 0x%p" " - 0x%p" " (%6ld kB)\n"
290 " .data : 0x%p" " - 0x%p" " (%6ld kB)\n",
291 MLM(VMALLOC_START, VMALLOC_END),
292 #ifdef CONFIG_SPARSEMEM_VMEMMAP
293 MLM((unsigned long)virt_to_page(PAGE_OFFSET),
294 (unsigned long)virt_to_page(high_memory)),
296 MLM(MODULES_VADDR, MODULES_END),
297 MLM(PAGE_OFFSET, (unsigned long)high_memory),
299 MLK_ROUNDUP(__init_begin, __init_end),
300 MLK_ROUNDUP(_text, _etext),
301 MLK_ROUNDUP(_sdata, _edata));
308 * Check boundaries twice: Some fundamental inconsistencies can be
309 * detected at build time already.
312 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
314 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
315 BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
317 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
318 extern int sysctl_overcommit_memory;
320 * On a machine this small we won't get anywhere without
321 * overcommit, so turn it on by default.
323 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
327 void free_initmem(void)
329 free_initmem_default(0);
332 #ifdef CONFIG_BLK_DEV_INITRD
334 static int keep_initrd;
336 void free_initrd_mem(unsigned long start, unsigned long end)
339 free_reserved_area((void *)start, (void *)end, 0, "initrd");
342 static int __init keepinitrd_setup(char *__unused)
348 __setup("keepinitrd", keepinitrd_setup);