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
34 pgd_t swapper_pg_dir[PTRS_PER_PGD];
35
36 void __init generic_mem_init(void)
37 {
38 memblock_add(__MEMORY_START, __MEMORY_SIZE);
39 }
40
41 void __init __weak plat_mem_setup(void)
42 {
43 /* Nothing to see here, move along. */
44 }
45
46 #ifdef CONFIG_MMU
47 static 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
81 static 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
98 static 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
111 void __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
123 void __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
135 static 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
151 static 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
167 static 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
173 void __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
208 void __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
227 static 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
245 static 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
278 void __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
341 unsigned int mem_init_done = 0;
342
343 void __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
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