1 /*
2 * linux/arch/unicore32/mm/init.c
3 *
4 * Copyright (C) 2010 GUAN Xue-tao
5 *
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.
9 */
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>
24
25 #include <asm/sections.h>
26 #include <asm/setup.h>
27 #include <asm/sizes.h>
28 #include <asm/tlb.h>
29 #include <asm/memblock.h>
30 #include <mach/map.h>
31
32 #include "mm.h"
33
34 static unsigned long phys_initrd_start __initdata = 0x01000000;
35 static unsigned long phys_initrd_size __initdata = SZ_8M;
36
early_initrd(char * p)37 static int __init early_initrd(char *p)
38 {
39 unsigned long start, size;
40 char *endp;
41
42 start = memparse(p, &endp);
43 if (*endp == ',') {
44 size = memparse(endp + 1, NULL);
45
46 phys_initrd_start = start;
47 phys_initrd_size = size;
48 }
49 return 0;
50 }
51 early_param("initrd", early_initrd);
52
53 /*
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().
57 */
58 struct meminfo meminfo;
59
find_limits(unsigned long * min,unsigned long * max_low,unsigned long * max_high)60 static void __init find_limits(unsigned long *min, unsigned long *max_low,
61 unsigned long *max_high)
62 {
63 struct meminfo *mi = &meminfo;
64 int i;
65
66 *min = -1UL;
67 *max_low = *max_high = 0;
68
69 for_each_bank(i, mi) {
70 struct membank *bank = &mi->bank[i];
71 unsigned long start, end;
72
73 start = bank_pfn_start(bank);
74 end = bank_pfn_end(bank);
75
76 if (*min > start)
77 *min = start;
78 if (*max_high < end)
79 *max_high = end;
80 if (bank->highmem)
81 continue;
82 if (*max_low < end)
83 *max_low = end;
84 }
85 }
86
uc32_bootmem_init(unsigned long start_pfn,unsigned long end_pfn)87 static void __init uc32_bootmem_init(unsigned long start_pfn,
88 unsigned long end_pfn)
89 {
90 struct memblock_region *reg;
91 unsigned int boot_pages;
92 phys_addr_t bitmap;
93 pg_data_t *pgdat;
94
95 /*
96 * Allocate the bootmem bitmap page. This must be in a region
97 * of memory which has already been mapped.
98 */
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));
102
103 /*
104 * Initialise the bootmem allocator, handing the
105 * memory banks over to bootmem.
106 */
107 node_set_online(0);
108 pgdat = NODE_DATA(0);
109 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
110
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);
115
116 if (end >= end_pfn)
117 end = end_pfn;
118 if (start >= end)
119 break;
120
121 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
122 }
123
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);
128
129 if (end >= end_pfn)
130 end = end_pfn;
131 if (start >= end)
132 break;
133
134 reserve_bootmem(__pfn_to_phys(start),
135 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
136 }
137 }
138
uc32_bootmem_free(unsigned long min,unsigned long max_low,unsigned long max_high)139 static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
140 unsigned long max_high)
141 {
142 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
143 struct memblock_region *reg;
144
145 /*
146 * initialise the zones.
147 */
148 memset(zone_size, 0, sizeof(zone_size));
149
150 /*
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.
154 */
155 zone_size[0] = max_low - min;
156
157 /*
158 * Calculate the size of the holes.
159 * holes = node_size - sum(bank_sizes)
160 */
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);
165
166 if (start < max_low) {
167 unsigned long low_end = min(end, max_low);
168 zhole_size[0] -= low_end - start;
169 }
170 }
171
172 /*
173 * Adjust the sizes according to any special requirements for
174 * this machine type.
175 */
176 arch_adjust_zones(zone_size, zhole_size);
177
178 free_area_init_node(0, zone_size, min, zhole_size);
179 }
180
pfn_valid(unsigned long pfn)181 int pfn_valid(unsigned long pfn)
182 {
183 return memblock_is_memory(pfn << PAGE_SHIFT);
184 }
185 EXPORT_SYMBOL(pfn_valid);
186
uc32_memory_present(void)187 static void uc32_memory_present(void)
188 {
189 }
190
meminfo_cmp(const void * _a,const void * _b)191 static int __init meminfo_cmp(const void *_a, const void *_b)
192 {
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;
196 }
197
uc32_memblock_init(struct meminfo * mi)198 void __init uc32_memblock_init(struct meminfo *mi)
199 {
200 int i;
201
202 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
203 meminfo_cmp, NULL);
204
205 for (i = 0; i < mi->nr_banks; i++)
206 memblock_add(mi->bank[i].start, mi->bank[i].size);
207
208 /* Register the kernel text, kernel data and initrd with memblock. */
209 memblock_reserve(__pa(_text), _end - _text);
210
211 #ifdef CONFIG_BLK_DEV_INITRD
212 if (phys_initrd_size) {
213 memblock_reserve(phys_initrd_start, phys_initrd_size);
214
215 /* Now convert initrd to virtual addresses */
216 initrd_start = __phys_to_virt(phys_initrd_start);
217 initrd_end = initrd_start + phys_initrd_size;
218 }
219 #endif
220
221 uc32_mm_memblock_reserve();
222
223 memblock_allow_resize();
224 memblock_dump_all();
225 }
226
bootmem_init(void)227 void __init bootmem_init(void)
228 {
229 unsigned long min, max_low, max_high;
230
231 max_low = max_high = 0;
232
233 find_limits(&min, &max_low, &max_high);
234
235 uc32_bootmem_init(min, max_low);
236
237 #ifdef CONFIG_SWIOTLB
238 swiotlb_init(1);
239 #endif
240 /*
241 * Sparsemem tries to allocate bootmem in memory_present(),
242 * so must be done after the fixed reservations
243 */
244 uc32_memory_present();
245
246 /*
247 * sparse_init() needs the bootmem allocator up and running.
248 */
249 sparse_init();
250
251 /*
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.
255 */
256 uc32_bootmem_free(min, max_low, max_high);
257
258 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
259
260 /*
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.
264 *
265 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
266 * the system, not the maximum PFN.
267 */
268 max_low_pfn = max_low - PHYS_PFN_OFFSET;
269 max_pfn = max_high - PHYS_PFN_OFFSET;
270 }
271
272 static inline void
free_memmap(unsigned long start_pfn,unsigned long end_pfn)273 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
274 {
275 struct page *start_pg, *end_pg;
276 unsigned long pg, pgend;
277
278 /*
279 * Convert start_pfn/end_pfn to a struct page pointer.
280 */
281 start_pg = pfn_to_page(start_pfn - 1) + 1;
282 end_pg = pfn_to_page(end_pfn);
283
284 /*
285 * Convert to physical addresses, and
286 * round start upwards and end downwards.
287 */
288 pg = PAGE_ALIGN(__pa(start_pg));
289 pgend = __pa(end_pg) & PAGE_MASK;
290
291 /*
292 * If there are free pages between these,
293 * free the section of the memmap array.
294 */
295 if (pg < pgend)
296 free_bootmem(pg, pgend - pg);
297 }
298
299 /*
300 * The mem_map array can get very big. Free the unused area of the memory map.
301 */
free_unused_memmap(struct meminfo * mi)302 static void __init free_unused_memmap(struct meminfo *mi)
303 {
304 unsigned long bank_start, prev_bank_end = 0;
305 unsigned int i;
306
307 /*
308 * This relies on each bank being in address order.
309 * The banks are sorted previously in bootmem_init().
310 */
311 for_each_bank(i, mi) {
312 struct membank *bank = &mi->bank[i];
313
314 bank_start = bank_pfn_start(bank);
315
316 /*
317 * If we had a previous bank, and there is a space
318 * between the current bank and the previous, free it.
319 */
320 if (prev_bank_end && prev_bank_end < bank_start)
321 free_memmap(prev_bank_end, bank_start);
322
323 /*
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.
327 */
328 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
329 }
330 }
331
332 /*
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.
336 */
mem_init(void)337 void __init mem_init(void)
338 {
339 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
340
341 free_unused_memmap(&meminfo);
342
343 /* this will put all unused low memory onto the freelists */
344 free_all_bootmem();
345
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",
355
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),
364
365 __init_begin, __init_end,
366 DIV_ROUND_UP((__init_end - __init_begin), SZ_1K),
367 _stext, _etext,
368 DIV_ROUND_UP((_etext - _stext), SZ_1K),
369 _sdata, _edata,
370 DIV_ROUND_UP((_edata - _sdata), SZ_1K));
371
372 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
373 BUG_ON(TASK_SIZE > MODULES_VADDR);
374
375 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
376 /*
377 * On a machine this small we won't get
378 * anywhere without overcommit, so turn
379 * it on by default.
380 */
381 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
382 }
383 }
384
free_initmem(void)385 void free_initmem(void)
386 {
387 free_initmem_default(-1);
388 }
389
390 #ifdef CONFIG_BLK_DEV_INITRD
391
392 static int keep_initrd;
393
free_initrd_mem(unsigned long start,unsigned long end)394 void free_initrd_mem(unsigned long start, unsigned long end)
395 {
396 if (!keep_initrd)
397 free_reserved_area((void *)start, (void *)end, -1, "initrd");
398 }
399
keepinitrd_setup(char * __unused)400 static int __init keepinitrd_setup(char *__unused)
401 {
402 keep_initrd = 1;
403 return 1;
404 }
405
406 __setup("keepinitrd", keepinitrd_setup);
407 #endif
408