1 /*
2 * linux/arch/sh/mm/init.c
3 *
4 * Copyright (C) 1999 Niibe Yutaka
5 * Copyright (C) 2002 - 2011 Paul Mundt
6 *
7 * Based on linux/arch/i386/mm/init.c:
8 * Copyright (C) 1995 Linus Torvalds
9 */
10 #include <linux/mm.h>
11 #include <linux/swap.h>
12 #include <linux/init.h>
13 #include <linux/gfp.h>
14 #include <linux/bootmem.h>
15 #include <linux/proc_fs.h>
16 #include <linux/pagemap.h>
17 #include <linux/percpu.h>
18 #include <linux/io.h>
19 #include <linux/memblock.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/export.h>
22 #include <asm/mmu_context.h>
23 #include <asm/mmzone.h>
24 #include <asm/kexec.h>
25 #include <asm/tlb.h>
26 #include <asm/cacheflush.h>
27 #include <asm/sections.h>
28 #include <asm/setup.h>
29 #include <asm/cache.h>
30 #include <asm/sizes.h>
31
32 pgd_t swapper_pg_dir[PTRS_PER_PGD];
33
generic_mem_init(void)34 void __init generic_mem_init(void)
35 {
36 memblock_add(__MEMORY_START, __MEMORY_SIZE);
37 }
38
plat_mem_setup(void)39 void __init __weak plat_mem_setup(void)
40 {
41 /* Nothing to see here, move along. */
42 }
43
44 #ifdef CONFIG_MMU
__get_pte_phys(unsigned long addr)45 static pte_t *__get_pte_phys(unsigned long addr)
46 {
47 pgd_t *pgd;
48 pud_t *pud;
49 pmd_t *pmd;
50
51 pgd = pgd_offset_k(addr);
52 if (pgd_none(*pgd)) {
53 pgd_ERROR(*pgd);
54 return NULL;
55 }
56
57 pud = pud_alloc(NULL, pgd, addr);
58 if (unlikely(!pud)) {
59 pud_ERROR(*pud);
60 return NULL;
61 }
62
63 pmd = pmd_alloc(NULL, pud, addr);
64 if (unlikely(!pmd)) {
65 pmd_ERROR(*pmd);
66 return NULL;
67 }
68
69 return pte_offset_kernel(pmd, addr);
70 }
71
set_pte_phys(unsigned long addr,unsigned long phys,pgprot_t prot)72 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
73 {
74 pte_t *pte;
75
76 pte = __get_pte_phys(addr);
77 if (!pte_none(*pte)) {
78 pte_ERROR(*pte);
79 return;
80 }
81
82 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
83 local_flush_tlb_one(get_asid(), addr);
84
85 if (pgprot_val(prot) & _PAGE_WIRED)
86 tlb_wire_entry(NULL, addr, *pte);
87 }
88
clear_pte_phys(unsigned long addr,pgprot_t prot)89 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
90 {
91 pte_t *pte;
92
93 pte = __get_pte_phys(addr);
94
95 if (pgprot_val(prot) & _PAGE_WIRED)
96 tlb_unwire_entry();
97
98 set_pte(pte, pfn_pte(0, __pgprot(0)));
99 local_flush_tlb_one(get_asid(), addr);
100 }
101
__set_fixmap(enum fixed_addresses idx,unsigned long phys,pgprot_t prot)102 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
103 {
104 unsigned long address = __fix_to_virt(idx);
105
106 if (idx >= __end_of_fixed_addresses) {
107 BUG();
108 return;
109 }
110
111 set_pte_phys(address, phys, prot);
112 }
113
__clear_fixmap(enum fixed_addresses idx,pgprot_t prot)114 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
115 {
116 unsigned long address = __fix_to_virt(idx);
117
118 if (idx >= __end_of_fixed_addresses) {
119 BUG();
120 return;
121 }
122
123 clear_pte_phys(address, prot);
124 }
125
one_md_table_init(pud_t * pud)126 static pmd_t * __init one_md_table_init(pud_t *pud)
127 {
128 if (pud_none(*pud)) {
129 pmd_t *pmd;
130
131 pmd = alloc_bootmem_pages(PAGE_SIZE);
132 pud_populate(&init_mm, pud, pmd);
133 BUG_ON(pmd != pmd_offset(pud, 0));
134 }
135
136 return pmd_offset(pud, 0);
137 }
138
one_page_table_init(pmd_t * pmd)139 static pte_t * __init one_page_table_init(pmd_t *pmd)
140 {
141 if (pmd_none(*pmd)) {
142 pte_t *pte;
143
144 pte = alloc_bootmem_pages(PAGE_SIZE);
145 pmd_populate_kernel(&init_mm, pmd, pte);
146 BUG_ON(pte != pte_offset_kernel(pmd, 0));
147 }
148
149 return pte_offset_kernel(pmd, 0);
150 }
151
page_table_kmap_check(pte_t * pte,pmd_t * pmd,unsigned long vaddr,pte_t * lastpte)152 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
153 unsigned long vaddr, pte_t *lastpte)
154 {
155 return pte;
156 }
157
page_table_range_init(unsigned long start,unsigned long end,pgd_t * pgd_base)158 void __init page_table_range_init(unsigned long start, unsigned long end,
159 pgd_t *pgd_base)
160 {
161 pgd_t *pgd;
162 pud_t *pud;
163 pmd_t *pmd;
164 pte_t *pte = NULL;
165 int i, j, k;
166 unsigned long vaddr;
167
168 vaddr = start;
169 i = __pgd_offset(vaddr);
170 j = __pud_offset(vaddr);
171 k = __pmd_offset(vaddr);
172 pgd = pgd_base + i;
173
174 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
175 pud = (pud_t *)pgd;
176 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
177 pmd = one_md_table_init(pud);
178 #ifndef __PAGETABLE_PMD_FOLDED
179 pmd += k;
180 #endif
181 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
182 pte = page_table_kmap_check(one_page_table_init(pmd),
183 pmd, vaddr, pte);
184 vaddr += PMD_SIZE;
185 }
186 k = 0;
187 }
188 j = 0;
189 }
190 }
191 #endif /* CONFIG_MMU */
192
allocate_pgdat(unsigned int nid)193 void __init allocate_pgdat(unsigned int nid)
194 {
195 unsigned long start_pfn, end_pfn;
196 #ifdef CONFIG_NEED_MULTIPLE_NODES
197 unsigned long phys;
198 #endif
199
200 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
201
202 #ifdef CONFIG_NEED_MULTIPLE_NODES
203 phys = __memblock_alloc_base(sizeof(struct pglist_data),
204 SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
205 /* Retry with all of system memory */
206 if (!phys)
207 phys = __memblock_alloc_base(sizeof(struct pglist_data),
208 SMP_CACHE_BYTES, memblock_end_of_DRAM());
209 if (!phys)
210 panic("Can't allocate pgdat for node %d\n", nid);
211
212 NODE_DATA(nid) = __va(phys);
213 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
214 #endif
215
216 NODE_DATA(nid)->node_start_pfn = start_pfn;
217 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
218 }
219
do_init_bootmem(void)220 static void __init do_init_bootmem(void)
221 {
222 struct memblock_region *reg;
223
224 /* Add active regions with valid PFNs. */
225 for_each_memblock(memory, reg) {
226 unsigned long start_pfn, end_pfn;
227 start_pfn = memblock_region_memory_base_pfn(reg);
228 end_pfn = memblock_region_memory_end_pfn(reg);
229 __add_active_range(0, start_pfn, end_pfn);
230 }
231
232 /* All of system RAM sits in node 0 for the non-NUMA case */
233 allocate_pgdat(0);
234 node_set_online(0);
235
236 plat_mem_setup();
237
238 for_each_memblock(memory, reg) {
239 int nid = memblock_get_region_node(reg);
240
241 memory_present(nid, memblock_region_memory_base_pfn(reg),
242 memblock_region_memory_end_pfn(reg));
243 }
244 sparse_init();
245 }
246
early_reserve_mem(void)247 static void __init early_reserve_mem(void)
248 {
249 unsigned long start_pfn;
250 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
251 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
252
253 /*
254 * Partially used pages are not usable - thus
255 * we are rounding upwards:
256 */
257 start_pfn = PFN_UP(__pa(_end));
258
259 /*
260 * Reserve the kernel text and Reserve the bootmem bitmap. We do
261 * this in two steps (first step was init_bootmem()), because
262 * this catches the (definitely buggy) case of us accidentally
263 * initializing the bootmem allocator with an invalid RAM area.
264 */
265 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
266
267 /*
268 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
269 */
270 if (CONFIG_ZERO_PAGE_OFFSET != 0)
271 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
272
273 /*
274 * Handle additional early reservations
275 */
276 check_for_initrd();
277 reserve_crashkernel();
278 }
279
paging_init(void)280 void __init paging_init(void)
281 {
282 unsigned long max_zone_pfns[MAX_NR_ZONES];
283 unsigned long vaddr, end;
284
285 sh_mv.mv_mem_init();
286
287 early_reserve_mem();
288
289 /*
290 * Once the early reservations are out of the way, give the
291 * platforms a chance to kick out some memory.
292 */
293 if (sh_mv.mv_mem_reserve)
294 sh_mv.mv_mem_reserve();
295
296 memblock_enforce_memory_limit(memory_limit);
297 memblock_allow_resize();
298
299 memblock_dump_all();
300
301 /*
302 * Determine low and high memory ranges:
303 */
304 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
305 min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
306
307 nodes_clear(node_online_map);
308
309 memory_start = (unsigned long)__va(__MEMORY_START);
310 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
311
312 uncached_init();
313 pmb_init();
314 do_init_bootmem();
315 ioremap_fixed_init();
316
317 /* We don't need to map the kernel through the TLB, as
318 * it is permanatly mapped using P1. So clear the
319 * entire pgd. */
320 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
321
322 /* Set an initial value for the MMU.TTB so we don't have to
323 * check for a null value. */
324 set_TTB(swapper_pg_dir);
325
326 /*
327 * Populate the relevant portions of swapper_pg_dir so that
328 * we can use the fixmap entries without calling kmalloc.
329 * pte's will be filled in by __set_fixmap().
330 */
331 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
332 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
333 page_table_range_init(vaddr, end, swapper_pg_dir);
334
335 kmap_coherent_init();
336
337 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
338 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
339 free_area_init_nodes(max_zone_pfns);
340 }
341
342 unsigned int mem_init_done = 0;
343
mem_init(void)344 void __init mem_init(void)
345 {
346 pg_data_t *pgdat;
347
348 high_memory = NULL;
349 for_each_online_pgdat(pgdat)
350 high_memory = max_t(void *, high_memory,
351 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
352
353 free_all_bootmem();
354
355 /* Set this up early, so we can take care of the zero page */
356 cpu_cache_init();
357
358 /* clear the zero-page */
359 memset(empty_zero_page, 0, PAGE_SIZE);
360 __flush_wback_region(empty_zero_page, PAGE_SIZE);
361
362 vsyscall_init();
363
364 mem_init_print_info(NULL);
365 pr_info("virtual kernel memory layout:\n"
366 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
367 #ifdef CONFIG_HIGHMEM
368 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
369 #endif
370 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
371 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
372 #ifdef CONFIG_UNCACHED_MAPPING
373 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
374 #endif
375 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
376 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
377 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
378 FIXADDR_START, FIXADDR_TOP,
379 (FIXADDR_TOP - FIXADDR_START) >> 10,
380
381 #ifdef CONFIG_HIGHMEM
382 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
383 (LAST_PKMAP*PAGE_SIZE) >> 10,
384 #endif
385
386 (unsigned long)VMALLOC_START, VMALLOC_END,
387 (VMALLOC_END - VMALLOC_START) >> 20,
388
389 (unsigned long)memory_start, (unsigned long)high_memory,
390 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
391
392 #ifdef CONFIG_UNCACHED_MAPPING
393 uncached_start, uncached_end, uncached_size >> 20,
394 #endif
395
396 (unsigned long)&__init_begin, (unsigned long)&__init_end,
397 ((unsigned long)&__init_end -
398 (unsigned long)&__init_begin) >> 10,
399
400 (unsigned long)&_etext, (unsigned long)&_edata,
401 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
402
403 (unsigned long)&_text, (unsigned long)&_etext,
404 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
405
406 mem_init_done = 1;
407 }
408
free_initmem(void)409 void free_initmem(void)
410 {
411 free_initmem_default(-1);
412 }
413
414 #ifdef CONFIG_BLK_DEV_INITRD
free_initrd_mem(unsigned long start,unsigned long end)415 void free_initrd_mem(unsigned long start, unsigned long end)
416 {
417 free_reserved_area((void *)start, (void *)end, -1, "initrd");
418 }
419 #endif
420
421 #ifdef CONFIG_MEMORY_HOTPLUG
arch_add_memory(int nid,u64 start,u64 size,struct vmem_altmap * altmap,bool want_memblock)422 int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
423 bool want_memblock)
424 {
425 unsigned long start_pfn = PFN_DOWN(start);
426 unsigned long nr_pages = size >> PAGE_SHIFT;
427 int ret;
428
429 /* We only have ZONE_NORMAL, so this is easy.. */
430 ret = __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
431 if (unlikely(ret))
432 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
433
434 return ret;
435 }
436
437 #ifdef CONFIG_NUMA
memory_add_physaddr_to_nid(u64 addr)438 int memory_add_physaddr_to_nid(u64 addr)
439 {
440 /* Node 0 for now.. */
441 return 0;
442 }
443 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
444 #endif
445
446 #ifdef CONFIG_MEMORY_HOTREMOVE
arch_remove_memory(u64 start,u64 size,struct vmem_altmap * altmap)447 int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
448 {
449 unsigned long start_pfn = PFN_DOWN(start);
450 unsigned long nr_pages = size >> PAGE_SHIFT;
451 struct zone *zone;
452 int ret;
453
454 zone = page_zone(pfn_to_page(start_pfn));
455 ret = __remove_pages(zone, start_pfn, nr_pages, altmap);
456 if (unlikely(ret))
457 pr_warn("%s: Failed, __remove_pages() == %d\n", __func__,
458 ret);
459
460 return ret;
461 }
462 #endif
463 #endif /* CONFIG_MEMORY_HOTPLUG */
464
