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-mapping.h>
34 #include <linux/dma-contiguous.h>
37 #include <asm/sections.h>
38 #include <asm/setup.h>
39 #include <asm/sizes.h>
44 static unsigned long phys_initrd_start __initdata = 0;
45 static unsigned long phys_initrd_size __initdata = 0;
47 phys_addr_t memstart_addr __read_mostly = 0;
49 void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
51 phys_initrd_start = start;
52 phys_initrd_size = end - start;
55 static int __init early_initrd(char *p)
57 unsigned long start, size;
60 start = memparse(p, &endp);
62 size = memparse(endp + 1, NULL);
64 phys_initrd_start = start;
65 phys_initrd_size = size;
69 early_param("initrd", early_initrd);
72 * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
73 * currently assumes that for memory starting above 4G, 32-bit devices will
76 static phys_addr_t max_zone_dma_phys(void)
78 phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
79 return min(offset + (1ULL << 32), memblock_end_of_DRAM());
82 static void __init zone_sizes_init(unsigned long min, unsigned long max)
84 struct memblock_region *reg;
85 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
86 unsigned long max_dma = min;
88 memset(zone_size, 0, sizeof(zone_size));
90 /* 4GB maximum for 32-bit only capable devices */
91 if (IS_ENABLED(CONFIG_ZONE_DMA)) {
92 max_dma = PFN_DOWN(max_zone_dma_phys());
93 zone_size[ZONE_DMA] = max_dma - min;
95 zone_size[ZONE_NORMAL] = max - max_dma;
97 memcpy(zhole_size, zone_size, sizeof(zhole_size));
99 for_each_memblock(memory, reg) {
100 unsigned long start = memblock_region_memory_base_pfn(reg);
101 unsigned long end = memblock_region_memory_end_pfn(reg);
106 if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
107 unsigned long dma_end = min(end, max_dma);
108 zhole_size[ZONE_DMA] -= dma_end - start;
112 unsigned long normal_end = min(end, max);
113 unsigned long normal_start = max(start, max_dma);
114 zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
118 free_area_init_node(0, zone_size, min, zhole_size);
121 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
122 #define PFN_MASK ((1UL << (64 - PAGE_SHIFT)) - 1)
124 int pfn_valid(unsigned long pfn)
126 return (pfn & PFN_MASK) == pfn && memblock_is_memory(pfn << PAGE_SHIFT);
128 EXPORT_SYMBOL(pfn_valid);
131 #ifndef CONFIG_SPARSEMEM
132 static void arm64_memory_present(void)
136 static void arm64_memory_present(void)
138 struct memblock_region *reg;
140 for_each_memblock(memory, reg)
141 memory_present(0, memblock_region_memory_base_pfn(reg),
142 memblock_region_memory_end_pfn(reg));
146 #ifdef CONFIG_ARCH_ROCKCHIP
147 extern struct ion_platform_data ion_pdata;
148 extern void __init ion_reserve(struct ion_platform_data *data);
149 extern int __init rockchip_ion_find_heap(unsigned long node,
150 const char *uname, int depth, void *data);
152 void __init rockchip_ion_reserve_bit64(void)
154 #ifdef CONFIG_ION_ROCKCHIP
155 printk("%s\n", __func__);
156 of_scan_flat_dt(rockchip_ion_find_heap, (void*)&ion_pdata);
157 ion_reserve(&ion_pdata);
162 void __init arm64_memblock_init(void)
164 u64 *reserve_map, base, size;
165 phys_addr_t dma_phys_limit = 0;
168 * Register the kernel text, kernel data, initrd, and initial
169 * pagetables with memblock.
171 memblock_reserve(__pa(_text), _end - _text);
172 #ifdef CONFIG_BLK_DEV_INITRD
173 if (phys_initrd_size) {
174 memblock_reserve(phys_initrd_start, phys_initrd_size);
176 /* Now convert initrd to virtual addresses */
177 initrd_start = __phys_to_virt(phys_initrd_start);
178 initrd_end = initrd_start + phys_initrd_size;
182 /* Reserve the dtb region */
183 memblock_reserve(virt_to_phys(initial_boot_params),
184 be32_to_cpu(initial_boot_params->totalsize));
187 * Process the reserve map. This will probably overlap the initrd
188 * and dtb locations which are already reserved, but overlapping
189 * doesn't hurt anything
191 reserve_map = ((void*)initial_boot_params) +
192 be32_to_cpu(initial_boot_params->off_mem_rsvmap);
194 base = be64_to_cpup(reserve_map++);
195 size = be64_to_cpup(reserve_map++);
198 memblock_reserve(base, size);
201 early_init_fdt_scan_reserved_mem();
202 #ifdef CONFIG_ARCH_ROCKCHIP
203 rockchip_ion_reserve_bit64();
206 /* 4GB maximum for 32-bit only capable devices */
207 if (IS_ENABLED(CONFIG_ZONE_DMA))
208 dma_phys_limit = max_zone_dma_phys();
209 dma_contiguous_reserve(dma_phys_limit);
211 memblock_allow_resize();
215 void __init bootmem_init(void)
217 unsigned long min, max;
219 min = PFN_UP(memblock_start_of_DRAM());
220 max = PFN_DOWN(memblock_end_of_DRAM());
223 * Sparsemem tries to allocate bootmem in memory_present(), so must be
224 * done after the fixed reservations.
226 arm64_memory_present();
229 zone_sizes_init(min, max);
231 high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
232 max_pfn = max_low_pfn = max;
236 * Poison init memory with an undefined instruction (0x0).
238 static inline void poison_init_mem(void *s, size_t count)
243 #ifndef CONFIG_SPARSEMEM_VMEMMAP
244 static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
246 struct page *start_pg, *end_pg;
247 unsigned long pg, pgend;
250 * Convert start_pfn/end_pfn to a struct page pointer.
252 start_pg = pfn_to_page(start_pfn - 1) + 1;
253 end_pg = pfn_to_page(end_pfn - 1) + 1;
256 * Convert to physical addresses, and round start upwards and end
259 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
260 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
263 * If there are free pages between these, free the section of the
267 free_bootmem(pg, pgend - pg);
271 * The mem_map array can get very big. Free the unused area of the memory map.
273 static void __init free_unused_memmap(void)
275 unsigned long start, prev_end = 0;
276 struct memblock_region *reg;
278 for_each_memblock(memory, reg) {
279 start = __phys_to_pfn(reg->base);
281 #ifdef CONFIG_SPARSEMEM
283 * Take care not to free memmap entries that don't exist due
284 * to SPARSEMEM sections which aren't present.
286 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
289 * If we had a previous bank, and there is a space between the
290 * current bank and the previous, free it.
292 if (prev_end && prev_end < start)
293 free_memmap(prev_end, start);
296 * Align up here since the VM subsystem insists that the
297 * memmap entries are valid from the bank end aligned to
298 * MAX_ORDER_NR_PAGES.
300 prev_end = ALIGN(start + __phys_to_pfn(reg->size),
304 #ifdef CONFIG_SPARSEMEM
305 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
306 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
309 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */
312 * mem_init() marks the free areas in the mem_map and tells us how much memory
313 * is free. This is done after various parts of the system have claimed their
314 * memory after the kernel image.
316 void __init mem_init(void)
318 unsigned long reserved_pages, free_pages;
319 struct memblock_region *reg;
321 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
323 #ifndef CONFIG_SPARSEMEM_VMEMMAP
324 /* this will put all unused low memory onto the freelists */
325 free_unused_memmap();
328 totalram_pages += free_all_bootmem();
330 reserved_pages = free_pages = 0;
332 for_each_memblock(memory, reg) {
333 unsigned int pfn1, pfn2;
334 struct page *page, *end;
336 pfn1 = __phys_to_pfn(reg->base);
337 pfn2 = pfn1 + __phys_to_pfn(reg->size);
339 page = pfn_to_page(pfn1);
340 end = pfn_to_page(pfn2 - 1) + 1;
343 if (PageReserved(page))
345 else if (!page_count(page))
348 } while (page < end);
352 * Since our memory may not be contiguous, calculate the real number
353 * of pages we have in this system.
357 for_each_memblock(memory, reg) {
358 unsigned long pages = memblock_region_memory_end_pfn(reg) -
359 memblock_region_memory_base_pfn(reg);
360 num_physpages += pages;
361 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
363 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
365 pr_notice("Memory: %luk/%luk available, %luk reserved\n",
366 nr_free_pages() << (PAGE_SHIFT-10),
367 free_pages << (PAGE_SHIFT-10),
368 reserved_pages << (PAGE_SHIFT-10));
370 #define MLK(b, t) b, t, ((t) - (b)) >> 10
371 #define MLM(b, t) b, t, ((t) - (b)) >> 20
372 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
374 pr_notice("Virtual kernel memory layout:\n"
375 " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n"
376 #ifdef CONFIG_SPARSEMEM_VMEMMAP
377 " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n"
379 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
380 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
381 " .init : 0x%p" " - 0x%p" " (%6ld kB)\n"
382 " .text : 0x%p" " - 0x%p" " (%6ld kB)\n"
383 " .data : 0x%p" " - 0x%p" " (%6ld kB)\n",
384 MLM(VMALLOC_START, VMALLOC_END),
385 #ifdef CONFIG_SPARSEMEM_VMEMMAP
386 MLM((unsigned long)virt_to_page(PAGE_OFFSET),
387 (unsigned long)virt_to_page(high_memory)),
389 MLM(MODULES_VADDR, MODULES_END),
390 MLM(PAGE_OFFSET, (unsigned long)high_memory),
392 MLK_ROUNDUP(__init_begin, __init_end),
393 MLK_ROUNDUP(_text, _etext),
394 MLK_ROUNDUP(_sdata, _edata));
401 * Check boundaries twice: Some fundamental inconsistencies can be
402 * detected at build time already.
405 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
407 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
408 BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
410 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
411 extern int sysctl_overcommit_memory;
413 * On a machine this small we won't get anywhere without
414 * overcommit, so turn it on by default.
416 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
420 void free_initmem(void)
422 poison_init_mem(__init_begin, __init_end - __init_begin);
423 free_initmem_default(0);
426 #ifdef CONFIG_BLK_DEV_INITRD
428 static int keep_initrd;
430 void free_initrd_mem(unsigned long start, unsigned long end)
433 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
434 free_reserved_area(start, end, 0, "initrd");
438 static int __init keepinitrd_setup(char *__unused)
444 __setup("keepinitrd", keepinitrd_setup);