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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/sh/mm/init.c
4 *
5 * Copyright (C) 1999 Niibe Yutaka
6 * Copyright (C) 2002 - 2011 Paul Mundt
7 *
8 * Based on linux/arch/i386/mm/init.c:
9 * Copyright (C) 1995 Linus Torvalds
10 */
11#include <linux/mm.h>
12#include <linux/swap.h>
13#include <linux/init.h>
14#include <linux/gfp.h>
15#include <linux/memblock.h>
16#include <linux/proc_fs.h>
17#include <linux/pagemap.h>
18#include <linux/percpu.h>
19#include <linux/io.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/pgalloc.h>
31#include <linux/sizes.h>
32#include "ioremap.h"
33
34pgd_t swapper_pg_dir[PTRS_PER_PGD];
35
36void __init generic_mem_init(void)
37{
38 memblock_add(__MEMORY_START, __MEMORY_SIZE);
39}
40
41void __init __weak plat_mem_setup(void)
42{
43 /* Nothing to see here, move along. */
44}
45
46#ifdef CONFIG_MMU
47static pte_t *__get_pte_phys(unsigned long addr)
48{
49 pgd_t *pgd;
50 p4d_t *p4d;
51 pud_t *pud;
52 pmd_t *pmd;
53
54 pgd = pgd_offset_k(addr);
55 if (pgd_none(*pgd)) {
56 pgd_ERROR(*pgd);
57 return NULL;
58 }
59
60 p4d = p4d_alloc(NULL, pgd, addr);
61 if (unlikely(!p4d)) {
62 p4d_ERROR(*p4d);
63 return NULL;
64 }
65
66 pud = pud_alloc(NULL, p4d, addr);
67 if (unlikely(!pud)) {
68 pud_ERROR(*pud);
69 return NULL;
70 }
71
72 pmd = pmd_alloc(NULL, pud, addr);
73 if (unlikely(!pmd)) {
74 pmd_ERROR(*pmd);
75 return NULL;
76 }
77
78 return pte_offset_kernel(pmd, addr);
79}
80
81static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
82{
83 pte_t *pte;
84
85 pte = __get_pte_phys(addr);
86 if (!pte_none(*pte)) {
87 pte_ERROR(*pte);
88 return;
89 }
90
91 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
92 local_flush_tlb_one(get_asid(), addr);
93
94 if (pgprot_val(prot) & _PAGE_WIRED)
95 tlb_wire_entry(NULL, addr, *pte);
96}
97
98static void clear_pte_phys(unsigned long addr, pgprot_t prot)
99{
100 pte_t *pte;
101
102 pte = __get_pte_phys(addr);
103
104 if (pgprot_val(prot) & _PAGE_WIRED)
105 tlb_unwire_entry();
106
107 set_pte(pte, pfn_pte(0, __pgprot(0)));
108 local_flush_tlb_one(get_asid(), addr);
109}
110
111void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
112{
113 unsigned long address = __fix_to_virt(idx);
114
115 if (idx >= __end_of_fixed_addresses) {
116 BUG();
117 return;
118 }
119
120 set_pte_phys(address, phys, prot);
121}
122
123void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
124{
125 unsigned long address = __fix_to_virt(idx);
126
127 if (idx >= __end_of_fixed_addresses) {
128 BUG();
129 return;
130 }
131
132 clear_pte_phys(address, prot);
133}
134
135static pmd_t * __init one_md_table_init(pud_t *pud)
136{
137 if (pud_none(*pud)) {
138 pmd_t *pmd;
139
140 pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
141 if (!pmd)
142 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
143 __func__, PAGE_SIZE, PAGE_SIZE);
144 pud_populate(&init_mm, pud, pmd);
145 BUG_ON(pmd != pmd_offset(pud, 0));
146 }
147
148 return pmd_offset(pud, 0);
149}
150
151static pte_t * __init one_page_table_init(pmd_t *pmd)
152{
153 if (pmd_none(*pmd)) {
154 pte_t *pte;
155
156 pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
157 if (!pte)
158 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
159 __func__, PAGE_SIZE, PAGE_SIZE);
160 pmd_populate_kernel(&init_mm, pmd, pte);
161 BUG_ON(pte != pte_offset_kernel(pmd, 0));
162 }
163
164 return pte_offset_kernel(pmd, 0);
165}
166
167static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
168 unsigned long vaddr, pte_t *lastpte)
169{
170 return pte;
171}
172
173void __init page_table_range_init(unsigned long start, unsigned long end,
174 pgd_t *pgd_base)
175{
176 pgd_t *pgd;
177 pud_t *pud;
178 pmd_t *pmd;
179 pte_t *pte = NULL;
180 int i, j, k;
181 unsigned long vaddr;
182
183 vaddr = start;
184 i = pgd_index(vaddr);
185 j = pud_index(vaddr);
186 k = pmd_index(vaddr);
187 pgd = pgd_base + i;
188
189 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
190 pud = (pud_t *)pgd;
191 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
192 pmd = one_md_table_init(pud);
193#ifndef __PAGETABLE_PMD_FOLDED
194 pmd += k;
195#endif
196 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
197 pte = page_table_kmap_check(one_page_table_init(pmd),
198 pmd, vaddr, pte);
199 vaddr += PMD_SIZE;
200 }
201 k = 0;
202 }
203 j = 0;
204 }
205}
206#endif /* CONFIG_MMU */
207
208void __init allocate_pgdat(unsigned int nid)
209{
210 unsigned long start_pfn, end_pfn;
211
212 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
213
214#ifdef CONFIG_NUMA
215 NODE_DATA(nid) = memblock_alloc_try_nid(
216 sizeof(struct pglist_data),
217 SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT,
218 MEMBLOCK_ALLOC_ACCESSIBLE, nid);
219 if (!NODE_DATA(nid))
220 panic("Can't allocate pgdat for node %d\n", nid);
221#endif
222
223 NODE_DATA(nid)->node_start_pfn = start_pfn;
224 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
225}
226
227static void __init do_init_bootmem(void)
228{
229 unsigned long start_pfn, end_pfn;
230 int i;
231
232 /* Add active regions with valid PFNs. */
233 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL)
234 __add_active_range(0, start_pfn, end_pfn);
235
236 /* All of system RAM sits in node 0 for the non-NUMA case */
237 allocate_pgdat(0);
238 node_set_online(0);
239
240 plat_mem_setup();
241
242 sparse_init();
243}
244
245static void __init early_reserve_mem(void)
246{
247 unsigned long start_pfn;
248 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
249 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
250
251 /*
252 * Partially used pages are not usable - thus
253 * we are rounding upwards:
254 */
255 start_pfn = PFN_UP(__pa(_end));
256
257 /*
258 * Reserve the kernel text and Reserve the bootmem bitmap. We do
259 * this in two steps (first step was init_bootmem()), because
260 * this catches the (definitely buggy) case of us accidentally
261 * initializing the bootmem allocator with an invalid RAM area.
262 */
263 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
264
265 /*
266 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
267 */
268 if (CONFIG_ZERO_PAGE_OFFSET != 0)
269 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
270
271 /*
272 * Handle additional early reservations
273 */
274 check_for_initrd();
275 reserve_crashkernel();
276}
277
278void __init paging_init(void)
279{
280 unsigned long max_zone_pfns[MAX_NR_ZONES];
281 unsigned long vaddr, end;
282
283 sh_mv.mv_mem_init();
284
285 early_reserve_mem();
286
287 /*
288 * Once the early reservations are out of the way, give the
289 * platforms a chance to kick out some memory.
290 */
291 if (sh_mv.mv_mem_reserve)
292 sh_mv.mv_mem_reserve();
293
294 memblock_enforce_memory_limit(memory_limit);
295 memblock_allow_resize();
296
297 memblock_dump_all();
298
299 /*
300 * Determine low and high memory ranges:
301 */
302 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
303 min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
304 set_max_mapnr(max_low_pfn - min_low_pfn);
305
306 nodes_clear(node_online_map);
307
308 memory_start = (unsigned long)__va(__MEMORY_START);
309 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
310
311 uncached_init();
312 pmb_init();
313 do_init_bootmem();
314 ioremap_fixed_init();
315
316 /* We don't need to map the kernel through the TLB, as
317 * it is permanatly mapped using P1. So clear the
318 * entire pgd. */
319 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
320
321 /* Set an initial value for the MMU.TTB so we don't have to
322 * check for a null value. */
323 set_TTB(swapper_pg_dir);
324
325 /*
326 * Populate the relevant portions of swapper_pg_dir so that
327 * we can use the fixmap entries without calling kmalloc.
328 * pte's will be filled in by __set_fixmap().
329 */
330 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
331 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
332 page_table_range_init(vaddr, end, swapper_pg_dir);
333
334 kmap_coherent_init();
335
336 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
337 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
338 free_area_init(max_zone_pfns);
339}
340
341unsigned int mem_init_done = 0;
342
343void __init mem_init(void)
344{
345 pg_data_t *pgdat;
346
347 high_memory = NULL;
348 for_each_online_pgdat(pgdat)
349 high_memory = max_t(void *, high_memory,
350 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
351
352 memblock_free_all();
353
354 /* Set this up early, so we can take care of the zero page */
355 cpu_cache_init();
356
357 /* clear the zero-page */
358 memset(empty_zero_page, 0, PAGE_SIZE);
359 __flush_wback_region(empty_zero_page, PAGE_SIZE);
360
361 vsyscall_init();
362
363 pr_info("virtual kernel memory layout:\n"
364 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
365 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
366 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
367#ifdef CONFIG_UNCACHED_MAPPING
368 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
369#endif
370 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
371 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
372 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
373 FIXADDR_START, FIXADDR_TOP,
374 (FIXADDR_TOP - FIXADDR_START) >> 10,
375
376 (unsigned long)VMALLOC_START, VMALLOC_END,
377 (VMALLOC_END - VMALLOC_START) >> 20,
378
379 (unsigned long)memory_start, (unsigned long)high_memory,
380 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
381
382#ifdef CONFIG_UNCACHED_MAPPING
383 uncached_start, uncached_end, uncached_size >> 20,
384#endif
385
386 (unsigned long)&__init_begin, (unsigned long)&__init_end,
387 ((unsigned long)&__init_end -
388 (unsigned long)&__init_begin) >> 10,
389
390 (unsigned long)&_etext, (unsigned long)&_edata,
391 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
392
393 (unsigned long)&_text, (unsigned long)&_etext,
394 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
395
396 mem_init_done = 1;
397}
398
399#ifdef CONFIG_MEMORY_HOTPLUG
400int arch_add_memory(int nid, u64 start, u64 size,
401 struct mhp_params *params)
402{
403 unsigned long start_pfn = PFN_DOWN(start);
404 unsigned long nr_pages = size >> PAGE_SHIFT;
405 int ret;
406
407 if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
408 return -EINVAL;
409
410 /* We only have ZONE_NORMAL, so this is easy.. */
411 ret = __add_pages(nid, start_pfn, nr_pages, params);
412 if (unlikely(ret))
413 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
414
415 return ret;
416}
417
418void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
419{
420 unsigned long start_pfn = PFN_DOWN(start);
421 unsigned long nr_pages = size >> PAGE_SHIFT;
422
423 __remove_pages(start_pfn, nr_pages, altmap);
424}
425#endif /* CONFIG_MEMORY_HOTPLUG */
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
32pgd_t swapper_pg_dir[PTRS_PER_PGD];
33
34void __init generic_mem_init(void)
35{
36 memblock_add(__MEMORY_START, __MEMORY_SIZE);
37}
38
39void __init __weak plat_mem_setup(void)
40{
41 /* Nothing to see here, move along. */
42}
43
44#ifdef CONFIG_MMU
45static 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
72static 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
89static 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
102void __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
114void __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
126static 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
139static 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
152static 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
158void __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
193void __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
220static 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
247static 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
280void __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/*
343 * Early initialization for any I/O MMUs we might have.
344 */
345static void __init iommu_init(void)
346{
347 no_iommu_init();
348}
349
350unsigned int mem_init_done = 0;
351
352void __init mem_init(void)
353{
354 pg_data_t *pgdat;
355
356 iommu_init();
357
358 high_memory = NULL;
359 for_each_online_pgdat(pgdat)
360 high_memory = max_t(void *, high_memory,
361 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
362
363 free_all_bootmem();
364
365 /* Set this up early, so we can take care of the zero page */
366 cpu_cache_init();
367
368 /* clear the zero-page */
369 memset(empty_zero_page, 0, PAGE_SIZE);
370 __flush_wback_region(empty_zero_page, PAGE_SIZE);
371
372 vsyscall_init();
373
374 mem_init_print_info(NULL);
375 pr_info("virtual kernel memory layout:\n"
376 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
377#ifdef CONFIG_HIGHMEM
378 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
379#endif
380 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
381 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
382#ifdef CONFIG_UNCACHED_MAPPING
383 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
384#endif
385 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
386 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
387 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
388 FIXADDR_START, FIXADDR_TOP,
389 (FIXADDR_TOP - FIXADDR_START) >> 10,
390
391#ifdef CONFIG_HIGHMEM
392 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
393 (LAST_PKMAP*PAGE_SIZE) >> 10,
394#endif
395
396 (unsigned long)VMALLOC_START, VMALLOC_END,
397 (VMALLOC_END - VMALLOC_START) >> 20,
398
399 (unsigned long)memory_start, (unsigned long)high_memory,
400 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
401
402#ifdef CONFIG_UNCACHED_MAPPING
403 uncached_start, uncached_end, uncached_size >> 20,
404#endif
405
406 (unsigned long)&__init_begin, (unsigned long)&__init_end,
407 ((unsigned long)&__init_end -
408 (unsigned long)&__init_begin) >> 10,
409
410 (unsigned long)&_etext, (unsigned long)&_edata,
411 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
412
413 (unsigned long)&_text, (unsigned long)&_etext,
414 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
415
416 mem_init_done = 1;
417}
418
419void free_initmem(void)
420{
421 free_initmem_default(-1);
422}
423
424#ifdef CONFIG_BLK_DEV_INITRD
425void free_initrd_mem(unsigned long start, unsigned long end)
426{
427 free_reserved_area((void *)start, (void *)end, -1, "initrd");
428}
429#endif
430
431#ifdef CONFIG_MEMORY_HOTPLUG
432int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
433 bool want_memblock)
434{
435 unsigned long start_pfn = PFN_DOWN(start);
436 unsigned long nr_pages = size >> PAGE_SHIFT;
437 int ret;
438
439 /* We only have ZONE_NORMAL, so this is easy.. */
440 ret = __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
441 if (unlikely(ret))
442 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
443
444 return ret;
445}
446
447#ifdef CONFIG_NUMA
448int memory_add_physaddr_to_nid(u64 addr)
449{
450 /* Node 0 for now.. */
451 return 0;
452}
453EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
454#endif
455
456#ifdef CONFIG_MEMORY_HOTREMOVE
457int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
458{
459 unsigned long start_pfn = PFN_DOWN(start);
460 unsigned long nr_pages = size >> PAGE_SHIFT;
461 struct zone *zone;
462 int ret;
463
464 zone = page_zone(pfn_to_page(start_pfn));
465 ret = __remove_pages(zone, start_pfn, nr_pages, altmap);
466 if (unlikely(ret))
467 pr_warn("%s: Failed, __remove_pages() == %d\n", __func__,
468 ret);
469
470 return ret;
471}
472#endif
473#endif /* CONFIG_MEMORY_HOTPLUG */