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>
35 #include <asm/sections.h>
36 #include <asm/setup.h>
37 #include <asm/sizes.h>
42 static unsigned long phys_initrd_start __initdata
= 0;
43 static unsigned long phys_initrd_size __initdata
= 0;
45 phys_addr_t memstart_addr __read_mostly
= 0;
47 void __init
early_init_dt_setup_initrd_arch(unsigned long start
,
50 phys_initrd_start
= start
;
51 phys_initrd_size
= end
- start
;
54 static int __init
early_initrd(char *p
)
56 unsigned long start
, size
;
59 start
= memparse(p
, &endp
);
61 size
= memparse(endp
+ 1, NULL
);
63 phys_initrd_start
= start
;
64 phys_initrd_size
= size
;
68 early_param("initrd", early_initrd
);
70 #define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT)
72 static void __init
zone_sizes_init(unsigned long min
, unsigned long max
)
74 struct memblock_region
*reg
;
75 unsigned long zone_size
[MAX_NR_ZONES
], zhole_size
[MAX_NR_ZONES
];
76 unsigned long max_dma32
= min
;
78 memset(zone_size
, 0, sizeof(zone_size
));
80 #ifdef CONFIG_ZONE_DMA32
81 /* 4GB maximum for 32-bit only capable devices */
82 max_dma32
= min(max
, MAX_DMA32_PFN
);
83 zone_size
[ZONE_DMA32
] = max_dma32
- min
;
85 zone_size
[ZONE_NORMAL
] = max
- max_dma32
;
87 memcpy(zhole_size
, zone_size
, sizeof(zhole_size
));
89 for_each_memblock(memory
, reg
) {
90 unsigned long start
= memblock_region_memory_base_pfn(reg
);
91 unsigned long end
= memblock_region_memory_end_pfn(reg
);
95 #ifdef CONFIG_ZONE_DMA32
96 if (start
< max_dma32
) {
97 unsigned long dma_end
= min(end
, max_dma32
);
98 zhole_size
[ZONE_DMA32
] -= dma_end
- start
;
101 if (end
> max_dma32
) {
102 unsigned long normal_end
= min(end
, max
);
103 unsigned long normal_start
= max(start
, max_dma32
);
104 zhole_size
[ZONE_NORMAL
] -= normal_end
- normal_start
;
108 free_area_init_node(0, zone_size
, min
, zhole_size
);
111 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
112 int pfn_valid(unsigned long pfn
)
114 return memblock_is_memory(pfn
<< PAGE_SHIFT
);
116 EXPORT_SYMBOL(pfn_valid
);
119 #ifndef CONFIG_SPARSEMEM
120 static void arm64_memory_present(void)
124 static void arm64_memory_present(void)
126 struct memblock_region
*reg
;
128 for_each_memblock(memory
, reg
)
129 memory_present(0, memblock_region_memory_base_pfn(reg
),
130 memblock_region_memory_end_pfn(reg
));
134 void __init
arm64_memblock_init(void)
136 u64
*reserve_map
, base
, size
;
138 /* Register the kernel text, kernel data and initrd with memblock */
139 memblock_reserve(__pa(_text
), _end
- _text
);
140 #ifdef CONFIG_BLK_DEV_INITRD
141 if (phys_initrd_size
) {
142 memblock_reserve(phys_initrd_start
, phys_initrd_size
);
144 /* Now convert initrd to virtual addresses */
145 initrd_start
= __phys_to_virt(phys_initrd_start
);
146 initrd_end
= initrd_start
+ phys_initrd_size
;
151 * Reserve the page tables. These are already in use,
152 * and can only be in node 0.
154 memblock_reserve(__pa(swapper_pg_dir
), SWAPPER_DIR_SIZE
);
155 memblock_reserve(__pa(idmap_pg_dir
), IDMAP_DIR_SIZE
);
157 /* Reserve the dtb region */
158 memblock_reserve(virt_to_phys(initial_boot_params
),
159 be32_to_cpu(initial_boot_params
->totalsize
));
162 * Process the reserve map. This will probably overlap the initrd
163 * and dtb locations which are already reserved, but overlapping
164 * doesn't hurt anything
166 reserve_map
= ((void*)initial_boot_params
) +
167 be32_to_cpu(initial_boot_params
->off_mem_rsvmap
);
169 base
= be64_to_cpup(reserve_map
++);
170 size
= be64_to_cpup(reserve_map
++);
173 memblock_reserve(base
, size
);
176 memblock_allow_resize();
180 void __init
bootmem_init(void)
182 unsigned long min
, max
;
184 min
= PFN_UP(memblock_start_of_DRAM());
185 max
= PFN_DOWN(memblock_end_of_DRAM());
188 * Sparsemem tries to allocate bootmem in memory_present(), so must be
189 * done after the fixed reservations.
191 arm64_memory_present();
194 zone_sizes_init(min
, max
);
196 high_memory
= __va((max
<< PAGE_SHIFT
) - 1) + 1;
197 max_pfn
= max_low_pfn
= max
;
200 static inline int free_area(unsigned long pfn
, unsigned long end
, char *s
)
202 unsigned int pages
= 0, size
= (end
- pfn
) << (PAGE_SHIFT
- 10);
204 for (; pfn
< end
; pfn
++) {
205 struct page
*page
= pfn_to_page(pfn
);
206 ClearPageReserved(page
);
207 init_page_count(page
);
213 pr_info("Freeing %s memory: %dK\n", s
, size
);
219 * Poison init memory with an undefined instruction (0x0).
221 static inline void poison_init_mem(void *s
, size_t count
)
226 #ifndef CONFIG_SPARSEMEM_VMEMMAP
227 static inline void free_memmap(unsigned long start_pfn
, unsigned long end_pfn
)
229 struct page
*start_pg
, *end_pg
;
230 unsigned long pg
, pgend
;
233 * Convert start_pfn/end_pfn to a struct page pointer.
235 start_pg
= pfn_to_page(start_pfn
- 1) + 1;
236 end_pg
= pfn_to_page(end_pfn
- 1) + 1;
239 * Convert to physical addresses, and round start upwards and end
242 pg
= (unsigned long)PAGE_ALIGN(__pa(start_pg
));
243 pgend
= (unsigned long)__pa(end_pg
) & PAGE_MASK
;
246 * If there are free pages between these, free the section of the
250 free_bootmem(pg
, pgend
- pg
);
254 * The mem_map array can get very big. Free the unused area of the memory map.
256 static void __init
free_unused_memmap(void)
258 unsigned long start
, prev_end
= 0;
259 struct memblock_region
*reg
;
261 for_each_memblock(memory
, reg
) {
262 start
= __phys_to_pfn(reg
->base
);
264 #ifdef CONFIG_SPARSEMEM
266 * Take care not to free memmap entries that don't exist due
267 * to SPARSEMEM sections which aren't present.
269 start
= min(start
, ALIGN(prev_end
, PAGES_PER_SECTION
));
272 * If we had a previous bank, and there is a space between the
273 * current bank and the previous, free it.
275 if (prev_end
&& prev_end
< start
)
276 free_memmap(prev_end
, start
);
279 * Align up here since the VM subsystem insists that the
280 * memmap entries are valid from the bank end aligned to
281 * MAX_ORDER_NR_PAGES.
283 prev_end
= ALIGN(start
+ __phys_to_pfn(reg
->size
),
287 #ifdef CONFIG_SPARSEMEM
288 if (!IS_ALIGNED(prev_end
, PAGES_PER_SECTION
))
289 free_memmap(prev_end
, ALIGN(prev_end
, PAGES_PER_SECTION
));
292 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */
295 * mem_init() marks the free areas in the mem_map and tells us how much memory
296 * is free. This is done after various parts of the system have claimed their
297 * memory after the kernel image.
299 void __init
mem_init(void)
301 unsigned long reserved_pages
, free_pages
;
302 struct memblock_region
*reg
;
305 extern void __init
arm64_swiotlb_init(size_t max_size
);
306 arm64_swiotlb_init(max_pfn
<< (PAGE_SHIFT
- 1));
309 max_mapnr
= pfn_to_page(max_pfn
+ PHYS_PFN_OFFSET
) - mem_map
;
311 #ifndef CONFIG_SPARSEMEM_VMEMMAP
312 /* this will put all unused low memory onto the freelists */
313 free_unused_memmap();
316 totalram_pages
+= free_all_bootmem();
318 reserved_pages
= free_pages
= 0;
320 for_each_memblock(memory
, reg
) {
321 unsigned int pfn1
, pfn2
;
322 struct page
*page
, *end
;
324 pfn1
= __phys_to_pfn(reg
->base
);
325 pfn2
= pfn1
+ __phys_to_pfn(reg
->size
);
327 page
= pfn_to_page(pfn1
);
328 end
= pfn_to_page(pfn2
- 1) + 1;
331 if (PageReserved(page
))
333 else if (!page_count(page
))
336 } while (page
< end
);
340 * Since our memory may not be contiguous, calculate the real number
341 * of pages we have in this system.
345 for_each_memblock(memory
, reg
) {
346 unsigned long pages
= memblock_region_memory_end_pfn(reg
) -
347 memblock_region_memory_base_pfn(reg
);
348 num_physpages
+= pages
;
349 printk(" %ldMB", pages
>> (20 - PAGE_SHIFT
));
351 printk(" = %luMB total\n", num_physpages
>> (20 - PAGE_SHIFT
));
353 pr_notice("Memory: %luk/%luk available, %luk reserved\n",
354 nr_free_pages() << (PAGE_SHIFT
-10),
355 free_pages
<< (PAGE_SHIFT
-10),
356 reserved_pages
<< (PAGE_SHIFT
-10));
358 #define MLK(b, t) b, t, ((t) - (b)) >> 10
359 #define MLM(b, t) b, t, ((t) - (b)) >> 20
360 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
362 pr_notice("Virtual kernel memory layout:\n"
363 " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n"
364 #ifdef CONFIG_SPARSEMEM_VMEMMAP
365 " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n"
367 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
368 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
369 " .init : 0x%p" " - 0x%p" " (%6ld kB)\n"
370 " .text : 0x%p" " - 0x%p" " (%6ld kB)\n"
371 " .data : 0x%p" " - 0x%p" " (%6ld kB)\n",
372 MLM(VMALLOC_START
, VMALLOC_END
),
373 #ifdef CONFIG_SPARSEMEM_VMEMMAP
374 MLM((unsigned long)virt_to_page(PAGE_OFFSET
),
375 (unsigned long)virt_to_page(high_memory
)),
377 MLM(MODULES_VADDR
, MODULES_END
),
378 MLM(PAGE_OFFSET
, (unsigned long)high_memory
),
380 MLK_ROUNDUP(__init_begin
, __init_end
),
381 MLK_ROUNDUP(_text
, _etext
),
382 MLK_ROUNDUP(_sdata
, _edata
));
389 * Check boundaries twice: Some fundamental inconsistencies can be
390 * detected at build time already.
393 BUILD_BUG_ON(TASK_SIZE_32
> TASK_SIZE_64
);
395 BUILD_BUG_ON(TASK_SIZE_64
> MODULES_VADDR
);
396 BUG_ON(TASK_SIZE_64
> MODULES_VADDR
);
398 if (PAGE_SIZE
>= 16384 && num_physpages
<= 128) {
399 extern int sysctl_overcommit_memory
;
401 * On a machine this small we won't get anywhere without
402 * overcommit, so turn it on by default.
404 sysctl_overcommit_memory
= OVERCOMMIT_ALWAYS
;
408 void free_initmem(void)
410 poison_init_mem(__init_begin
, __init_end
- __init_begin
);
411 totalram_pages
+= free_area(__phys_to_pfn(__pa(__init_begin
)),
412 __phys_to_pfn(__pa(__init_end
)),
416 #ifdef CONFIG_BLK_DEV_INITRD
418 static int keep_initrd
;
420 void free_initrd_mem(unsigned long start
, unsigned long end
)
423 poison_init_mem((void *)start
, PAGE_ALIGN(end
) - start
);
424 totalram_pages
+= free_area(__phys_to_pfn(__pa(start
)),
425 __phys_to_pfn(__pa(end
)),
430 static int __init
keepinitrd_setup(char *__unused
)
436 __setup("keepinitrd", keepinitrd_setup
);