2 * linux/arch/unicore32/mm/init.c
4 * Copyright (C) 2010 GUAN Xue-tao
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #include <linux/kernel.h>
11 #include <linux/errno.h>
12 #include <linux/swap.h>
13 #include <linux/init.h>
14 #include <linux/bootmem.h>
15 #include <linux/mman.h>
16 #include <linux/nodemask.h>
17 #include <linux/initrd.h>
18 #include <linux/highmem.h>
19 #include <linux/gfp.h>
20 #include <linux/memblock.h>
21 #include <linux/sort.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/export.h>
25 #include <asm/sections.h>
26 #include <asm/setup.h>
27 #include <asm/sizes.h>
29 #include <asm/memblock.h>
34 static unsigned long phys_initrd_start __initdata = 0x01000000;
35 static unsigned long phys_initrd_size __initdata = SZ_8M;
37 static int __init early_initrd(char *p)
39 unsigned long start, size;
42 start = memparse(p, &endp);
44 size = memparse(endp + 1, NULL);
46 phys_initrd_start = start;
47 phys_initrd_size = size;
51 early_param("initrd", early_initrd);
54 * This keeps memory configuration data used by a couple memory
55 * initialization functions, as well as show_mem() for the skipping
56 * of holes in the memory map. It is populated by uc32_add_memory().
58 struct meminfo meminfo;
60 static void __init find_limits(unsigned long *min, unsigned long *max_low,
61 unsigned long *max_high)
63 struct meminfo *mi = &meminfo;
67 *max_low = *max_high = 0;
69 for_each_bank(i, mi) {
70 struct membank *bank = &mi->bank[i];
71 unsigned long start, end;
73 start = bank_pfn_start(bank);
74 end = bank_pfn_end(bank);
87 static void __init uc32_bootmem_init(unsigned long start_pfn,
88 unsigned long end_pfn)
90 struct memblock_region *reg;
91 unsigned int boot_pages;
96 * Allocate the bootmem bitmap page. This must be in a region
97 * of memory which has already been mapped.
99 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
100 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
101 __pfn_to_phys(end_pfn));
104 * Initialise the bootmem allocator, handing the
105 * memory banks over to bootmem.
108 pgdat = NODE_DATA(0);
109 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
111 /* Free the lowmem regions from memblock into bootmem. */
112 for_each_memblock(memory, reg) {
113 unsigned long start = memblock_region_memory_base_pfn(reg);
114 unsigned long end = memblock_region_memory_end_pfn(reg);
121 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
124 /* Reserve the lowmem memblock reserved regions in bootmem. */
125 for_each_memblock(reserved, reg) {
126 unsigned long start = memblock_region_reserved_base_pfn(reg);
127 unsigned long end = memblock_region_reserved_end_pfn(reg);
134 reserve_bootmem(__pfn_to_phys(start),
135 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
139 static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
140 unsigned long max_high)
142 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
143 struct memblock_region *reg;
146 * initialise the zones.
148 memset(zone_size, 0, sizeof(zone_size));
151 * The memory size has already been determined. If we need
152 * to do anything fancy with the allocation of this memory
153 * to the zones, now is the time to do it.
155 zone_size[0] = max_low - min;
158 * Calculate the size of the holes.
159 * holes = node_size - sum(bank_sizes)
161 memcpy(zhole_size, zone_size, sizeof(zhole_size));
162 for_each_memblock(memory, reg) {
163 unsigned long start = memblock_region_memory_base_pfn(reg);
164 unsigned long end = memblock_region_memory_end_pfn(reg);
166 if (start < max_low) {
167 unsigned long low_end = min(end, max_low);
168 zhole_size[0] -= low_end - start;
173 * Adjust the sizes according to any special requirements for
176 arch_adjust_zones(zone_size, zhole_size);
178 free_area_init_node(0, zone_size, min, zhole_size);
181 int pfn_valid(unsigned long pfn)
183 return memblock_is_memory(pfn << PAGE_SHIFT);
185 EXPORT_SYMBOL(pfn_valid);
187 static void uc32_memory_present(void)
191 static int __init meminfo_cmp(const void *_a, const void *_b)
193 const struct membank *a = _a, *b = _b;
194 long cmp = bank_pfn_start(a) - bank_pfn_start(b);
195 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
198 void __init uc32_memblock_init(struct meminfo *mi)
202 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
205 for (i = 0; i < mi->nr_banks; i++)
206 memblock_add(mi->bank[i].start, mi->bank[i].size);
208 /* Register the kernel text, kernel data and initrd with memblock. */
209 memblock_reserve(__pa(_text), _end - _text);
211 #ifdef CONFIG_BLK_DEV_INITRD
212 if (phys_initrd_size) {
213 memblock_reserve(phys_initrd_start, phys_initrd_size);
215 /* Now convert initrd to virtual addresses */
216 initrd_start = __phys_to_virt(phys_initrd_start);
217 initrd_end = initrd_start + phys_initrd_size;
221 uc32_mm_memblock_reserve();
223 memblock_allow_resize();
227 void __init bootmem_init(void)
229 unsigned long min, max_low, max_high;
231 max_low = max_high = 0;
233 find_limits(&min, &max_low, &max_high);
235 uc32_bootmem_init(min, max_low);
237 #ifdef CONFIG_SWIOTLB
241 * Sparsemem tries to allocate bootmem in memory_present(),
242 * so must be done after the fixed reservations
244 uc32_memory_present();
247 * sparse_init() needs the bootmem allocator up and running.
252 * Now free the memory - free_area_init_node needs
253 * the sparse mem_map arrays initialized by sparse_init()
254 * for memmap_init_zone(), otherwise all PFNs are invalid.
256 uc32_bootmem_free(min, max_low, max_high);
258 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
261 * This doesn't seem to be used by the Linux memory manager any
262 * more, but is used by ll_rw_block. If we can get rid of it, we
263 * also get rid of some of the stuff above as well.
265 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
266 * the system, not the maximum PFN.
268 max_low_pfn = max_low - PHYS_PFN_OFFSET;
269 max_pfn = max_high - PHYS_PFN_OFFSET;
273 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
275 struct page *start_pg, *end_pg;
276 unsigned long pg, pgend;
279 * Convert start_pfn/end_pfn to a struct page pointer.
281 start_pg = pfn_to_page(start_pfn - 1) + 1;
282 end_pg = pfn_to_page(end_pfn);
285 * Convert to physical addresses, and
286 * round start upwards and end downwards.
288 pg = PAGE_ALIGN(__pa(start_pg));
289 pgend = __pa(end_pg) & PAGE_MASK;
292 * If there are free pages between these,
293 * free the section of the memmap array.
296 free_bootmem(pg, pgend - pg);
300 * The mem_map array can get very big. Free the unused area of the memory map.
302 static void __init free_unused_memmap(struct meminfo *mi)
304 unsigned long bank_start, prev_bank_end = 0;
308 * This relies on each bank being in address order.
309 * The banks are sorted previously in bootmem_init().
311 for_each_bank(i, mi) {
312 struct membank *bank = &mi->bank[i];
314 bank_start = bank_pfn_start(bank);
317 * If we had a previous bank, and there is a space
318 * between the current bank and the previous, free it.
320 if (prev_bank_end && prev_bank_end < bank_start)
321 free_memmap(prev_bank_end, bank_start);
324 * Align up here since the VM subsystem insists that the
325 * memmap entries are valid from the bank end aligned to
326 * MAX_ORDER_NR_PAGES.
328 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
333 * mem_init() marks the free areas in the mem_map and tells us how much
334 * memory is free. This is done after various parts of the system have
335 * claimed their memory after the kernel image.
337 void __init mem_init(void)
339 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
341 free_unused_memmap(&meminfo);
343 /* this will put all unused low memory onto the freelists */
346 mem_init_print_info(NULL);
347 printk(KERN_NOTICE "Virtual kernel memory layout:\n"
348 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
349 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
350 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
351 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
352 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
353 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
354 " .data : 0x%p" " - 0x%p" " (%4d kB)\n",
356 VECTORS_BASE, VECTORS_BASE + PAGE_SIZE,
357 DIV_ROUND_UP(PAGE_SIZE, SZ_1K),
358 VMALLOC_START, VMALLOC_END,
359 DIV_ROUND_UP((VMALLOC_END - VMALLOC_START), SZ_1M),
360 PAGE_OFFSET, (unsigned long)high_memory,
361 DIV_ROUND_UP(((unsigned long)high_memory - PAGE_OFFSET), SZ_1M),
362 MODULES_VADDR, MODULES_END,
363 DIV_ROUND_UP((MODULES_END - MODULES_VADDR), SZ_1M),
365 __init_begin, __init_end,
366 DIV_ROUND_UP((__init_end - __init_begin), SZ_1K),
368 DIV_ROUND_UP((_etext - _stext), SZ_1K),
370 DIV_ROUND_UP((_edata - _sdata), SZ_1K));
372 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
373 BUG_ON(TASK_SIZE > MODULES_VADDR);
375 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
377 * On a machine this small we won't get
378 * anywhere without overcommit, so turn
381 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
385 void free_initmem(void)
387 free_initmem_default(-1);
390 #ifdef CONFIG_BLK_DEV_INITRD
392 static int keep_initrd;
394 void free_initrd_mem(unsigned long start, unsigned long end)
397 free_reserved_area((void *)start, (void *)end, -1, "initrd");
400 static int __init keepinitrd_setup(char *__unused)
406 __setup("keepinitrd", keepinitrd_setup);