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
generic_mem_init(void)36 void __init generic_mem_init(void)
37 {
38 memblock_add(__MEMORY_START, __MEMORY_SIZE);
39 }
40
plat_mem_setup(void)41 void __init __weak plat_mem_setup(void)
42 {
43 /* Nothing to see here, move along. */
44 }
45
46 #ifdef CONFIG_MMU
__get_pte_phys(unsigned long addr)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
set_pte_phys(unsigned long addr,unsigned long phys,pgprot_t prot)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
clear_pte_phys(unsigned long addr,pgprot_t prot)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
__set_fixmap(enum fixed_addresses idx,unsigned long phys,pgprot_t prot)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
__clear_fixmap(enum fixed_addresses idx,pgprot_t prot)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
one_md_table_init(pud_t * pud)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_or_panic(PAGE_SIZE, PAGE_SIZE);
141 pud_populate(&init_mm, pud, pmd);
142 BUG_ON(pmd != pmd_offset(pud, 0));
143 }
144
145 return pmd_offset(pud, 0);
146 }
147
one_page_table_init(pmd_t * pmd)148 static pte_t * __init one_page_table_init(pmd_t *pmd)
149 {
150 if (pmd_none(*pmd)) {
151 pte_t *pte;
152
153 pte = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE);
154 pmd_populate_kernel(&init_mm, pmd, pte);
155 BUG_ON(pte != pte_offset_kernel(pmd, 0));
156 }
157
158 return pte_offset_kernel(pmd, 0);
159 }
160
page_table_kmap_check(pte_t * pte,pmd_t * pmd,unsigned long vaddr,pte_t * lastpte)161 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
162 unsigned long vaddr, pte_t *lastpte)
163 {
164 return pte;
165 }
166
page_table_range_init(unsigned long start,unsigned long end,pgd_t * pgd_base)167 void __init page_table_range_init(unsigned long start, unsigned long end,
168 pgd_t *pgd_base)
169 {
170 pgd_t *pgd;
171 pud_t *pud;
172 pmd_t *pmd;
173 pte_t *pte = NULL;
174 int i, j, k;
175 unsigned long vaddr;
176
177 vaddr = start;
178 i = pgd_index(vaddr);
179 j = pud_index(vaddr);
180 k = pmd_index(vaddr);
181 pgd = pgd_base + i;
182
183 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
184 pud = (pud_t *)pgd;
185 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
186 pmd = one_md_table_init(pud);
187 #ifndef __PAGETABLE_PMD_FOLDED
188 pmd += k;
189 #endif
190 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
191 pte = page_table_kmap_check(one_page_table_init(pmd),
192 pmd, vaddr, pte);
193 vaddr += PMD_SIZE;
194 }
195 k = 0;
196 }
197 j = 0;
198 }
199 }
200 #endif /* CONFIG_MMU */
201
allocate_pgdat(unsigned int nid)202 void __init allocate_pgdat(unsigned int nid)
203 {
204 unsigned long start_pfn, end_pfn;
205
206 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
207
208 #ifdef CONFIG_NUMA
209 alloc_node_data(nid);
210 #endif
211
212 NODE_DATA(nid)->node_start_pfn = start_pfn;
213 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
214 }
215
do_init_bootmem(void)216 static void __init do_init_bootmem(void)
217 {
218 unsigned long start_pfn, end_pfn;
219 int i;
220
221 /* Add active regions with valid PFNs. */
222 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL)
223 __add_active_range(0, start_pfn, end_pfn);
224
225 /* All of system RAM sits in node 0 for the non-NUMA case */
226 allocate_pgdat(0);
227 node_set_online(0);
228
229 plat_mem_setup();
230
231 sparse_init();
232 }
233
early_reserve_mem(void)234 static void __init early_reserve_mem(void)
235 {
236 unsigned long start_pfn;
237 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
238 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
239
240 /*
241 * Partially used pages are not usable - thus
242 * we are rounding upwards:
243 */
244 start_pfn = PFN_UP(__pa(_end));
245
246 /*
247 * Reserve the kernel text and Reserve the bootmem bitmap. We do
248 * this in two steps (first step was init_bootmem()), because
249 * this catches the (definitely buggy) case of us accidentally
250 * initializing the bootmem allocator with an invalid RAM area.
251 */
252 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
253
254 /*
255 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
256 */
257 if (CONFIG_ZERO_PAGE_OFFSET != 0)
258 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
259
260 /*
261 * Handle additional early reservations
262 */
263 check_for_initrd();
264 reserve_crashkernel();
265 }
266
paging_init(void)267 void __init paging_init(void)
268 {
269 unsigned long max_zone_pfns[MAX_NR_ZONES];
270 unsigned long vaddr, end;
271
272 sh_mv.mv_mem_init();
273
274 early_reserve_mem();
275
276 /*
277 * Once the early reservations are out of the way, give the
278 * platforms a chance to kick out some memory.
279 */
280 if (sh_mv.mv_mem_reserve)
281 sh_mv.mv_mem_reserve();
282
283 memblock_enforce_memory_limit(memory_limit);
284 memblock_allow_resize();
285
286 memblock_dump_all();
287
288 /*
289 * Determine low and high memory ranges:
290 */
291 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
292 min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
293 set_max_mapnr(max_low_pfn - min_low_pfn);
294
295 nodes_clear(node_online_map);
296
297 memory_start = (unsigned long)__va(__MEMORY_START);
298 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
299
300 uncached_init();
301 pmb_init();
302 do_init_bootmem();
303 ioremap_fixed_init();
304
305 /* We don't need to map the kernel through the TLB, as
306 * it is permanatly mapped using P1. So clear the
307 * entire pgd. */
308 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
309
310 /* Set an initial value for the MMU.TTB so we don't have to
311 * check for a null value. */
312 set_TTB(swapper_pg_dir);
313
314 /*
315 * Populate the relevant portions of swapper_pg_dir so that
316 * we can use the fixmap entries without calling kmalloc.
317 * pte's will be filled in by __set_fixmap().
318 */
319 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
320 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
321 page_table_range_init(vaddr, end, swapper_pg_dir);
322
323 kmap_coherent_init();
324
325 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
326 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
327 free_area_init(max_zone_pfns);
328 }
329
330 unsigned int mem_init_done = 0;
331
mem_init(void)332 void __init mem_init(void)
333 {
334 pg_data_t *pgdat;
335
336 high_memory = NULL;
337 for_each_online_pgdat(pgdat)
338 high_memory = max_t(void *, high_memory,
339 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
340
341 memblock_free_all();
342
343 /* Set this up early, so we can take care of the zero page */
344 cpu_cache_init();
345
346 /* clear the zero-page */
347 memset(empty_zero_page, 0, PAGE_SIZE);
348 __flush_wback_region(empty_zero_page, PAGE_SIZE);
349
350 vsyscall_init();
351
352 pr_info("virtual kernel memory layout:\n"
353 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
354 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
355 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
356 #ifdef CONFIG_UNCACHED_MAPPING
357 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
358 #endif
359 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
360 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
361 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
362 FIXADDR_START, FIXADDR_TOP,
363 (FIXADDR_TOP - FIXADDR_START) >> 10,
364
365 (unsigned long)VMALLOC_START, VMALLOC_END,
366 (VMALLOC_END - VMALLOC_START) >> 20,
367
368 (unsigned long)memory_start, (unsigned long)high_memory,
369 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
370
371 #ifdef CONFIG_UNCACHED_MAPPING
372 uncached_start, uncached_end, uncached_size >> 20,
373 #endif
374
375 (unsigned long)&__init_begin, (unsigned long)&__init_end,
376 ((unsigned long)&__init_end -
377 (unsigned long)&__init_begin) >> 10,
378
379 (unsigned long)&_etext, (unsigned long)&_edata,
380 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
381
382 (unsigned long)&_text, (unsigned long)&_etext,
383 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
384
385 mem_init_done = 1;
386 }
387