1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 Regents of the University of California
4 * Copyright (C) 2019 Western Digital Corporation or its affiliates.
5 */
6
7 #include <linux/init.h>
8 #include <linux/mm.h>
9 #include <linux/memblock.h>
10 #include <linux/initrd.h>
11 #include <linux/swap.h>
12 #include <linux/sizes.h>
13 #include <linux/of_fdt.h>
14 #include <linux/libfdt.h>
15 #include <linux/set_memory.h>
16
17 #include <asm/fixmap.h>
18 #include <asm/tlbflush.h>
19 #include <asm/sections.h>
20 #include <asm/soc.h>
21 #include <asm/io.h>
22 #include <asm/ptdump.h>
23
24 #include "../kernel/head.h"
25
26 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
27 __page_aligned_bss;
28 EXPORT_SYMBOL(empty_zero_page);
29
30 extern char _start[];
31 #define DTB_EARLY_BASE_VA PGDIR_SIZE
32 void *dtb_early_va __initdata;
33 uintptr_t dtb_early_pa __initdata;
34
35 struct pt_alloc_ops {
36 pte_t *(*get_pte_virt)(phys_addr_t pa);
37 phys_addr_t (*alloc_pte)(uintptr_t va);
38 #ifndef __PAGETABLE_PMD_FOLDED
39 pmd_t *(*get_pmd_virt)(phys_addr_t pa);
40 phys_addr_t (*alloc_pmd)(uintptr_t va);
41 #endif
42 };
43
zone_sizes_init(void)44 static void __init zone_sizes_init(void)
45 {
46 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
47
48 #ifdef CONFIG_ZONE_DMA32
49 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G,
50 (unsigned long) PFN_PHYS(max_low_pfn)));
51 #endif
52 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
53
54 free_area_init(max_zone_pfns);
55 }
56
setup_zero_page(void)57 static void setup_zero_page(void)
58 {
59 memset((void *)empty_zero_page, 0, PAGE_SIZE);
60 }
61
62 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
print_mlk(char * name,unsigned long b,unsigned long t)63 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
64 {
65 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
66 (((t) - (b)) >> 10));
67 }
68
print_mlm(char * name,unsigned long b,unsigned long t)69 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
70 {
71 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
72 (((t) - (b)) >> 20));
73 }
74
print_vm_layout(void)75 static void print_vm_layout(void)
76 {
77 pr_notice("Virtual kernel memory layout:\n");
78 print_mlk("fixmap", (unsigned long)FIXADDR_START,
79 (unsigned long)FIXADDR_TOP);
80 print_mlm("pci io", (unsigned long)PCI_IO_START,
81 (unsigned long)PCI_IO_END);
82 print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
83 (unsigned long)VMEMMAP_END);
84 print_mlm("vmalloc", (unsigned long)VMALLOC_START,
85 (unsigned long)VMALLOC_END);
86 print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
87 (unsigned long)high_memory);
88 }
89 #else
print_vm_layout(void)90 static void print_vm_layout(void) { }
91 #endif /* CONFIG_DEBUG_VM */
92
mem_init(void)93 void __init mem_init(void)
94 {
95 #ifdef CONFIG_FLATMEM
96 BUG_ON(!mem_map);
97 #endif /* CONFIG_FLATMEM */
98
99 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
100 memblock_free_all();
101
102 mem_init_print_info(NULL);
103 print_vm_layout();
104 }
105
106 #ifdef CONFIG_BLK_DEV_INITRD
setup_initrd(void)107 static void __init setup_initrd(void)
108 {
109 phys_addr_t start;
110 unsigned long size;
111
112 /* Ignore the virtul address computed during device tree parsing */
113 initrd_start = initrd_end = 0;
114
115 if (!phys_initrd_size)
116 return;
117 /*
118 * Round the memory region to page boundaries as per free_initrd_mem()
119 * This allows us to detect whether the pages overlapping the initrd
120 * are in use, but more importantly, reserves the entire set of pages
121 * as we don't want these pages allocated for other purposes.
122 */
123 start = round_down(phys_initrd_start, PAGE_SIZE);
124 size = phys_initrd_size + (phys_initrd_start - start);
125 size = round_up(size, PAGE_SIZE);
126
127 if (!memblock_is_region_memory(start, size)) {
128 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
129 (u64)start, size);
130 goto disable;
131 }
132
133 if (memblock_is_region_reserved(start, size)) {
134 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
135 (u64)start, size);
136 goto disable;
137 }
138
139 memblock_reserve(start, size);
140 /* Now convert initrd to virtual addresses */
141 initrd_start = (unsigned long)__va(phys_initrd_start);
142 initrd_end = initrd_start + phys_initrd_size;
143 initrd_below_start_ok = 1;
144
145 pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
146 (void *)(initrd_start), size);
147 return;
148 disable:
149 pr_cont(" - disabling initrd\n");
150 initrd_start = 0;
151 initrd_end = 0;
152 }
153 #endif /* CONFIG_BLK_DEV_INITRD */
154
setup_bootmem(void)155 void __init setup_bootmem(void)
156 {
157 phys_addr_t mem_start = 0;
158 phys_addr_t start, dram_end, end = 0;
159 phys_addr_t vmlinux_end = __pa_symbol(&_end);
160 phys_addr_t vmlinux_start = __pa_symbol(&_start);
161 phys_addr_t max_mapped_addr = __pa(~(ulong)0);
162 u64 i;
163
164 /* Find the memory region containing the kernel */
165 for_each_mem_range(i, &start, &end) {
166 phys_addr_t size = end - start;
167 if (!mem_start)
168 mem_start = start;
169 if (start <= vmlinux_start && vmlinux_end <= end)
170 BUG_ON(size == 0);
171 }
172
173 /*
174 * The maximal physical memory size is -PAGE_OFFSET.
175 * Make sure that any memory beyond mem_start + (-PAGE_OFFSET) is removed
176 * as it is unusable by kernel.
177 */
178 memblock_enforce_memory_limit(-PAGE_OFFSET);
179
180 /* Reserve from the start of the kernel to the end of the kernel */
181 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
182
183 dram_end = memblock_end_of_DRAM();
184
185 /*
186 * memblock allocator is not aware of the fact that last 4K bytes of
187 * the addressable memory can not be mapped because of IS_ERR_VALUE
188 * macro. Make sure that last 4k bytes are not usable by memblock
189 * if end of dram is equal to maximum addressable memory.
190 */
191 if (max_mapped_addr == (dram_end - 1))
192 memblock_set_current_limit(max_mapped_addr - 4096);
193
194 max_pfn = PFN_DOWN(dram_end);
195 max_low_pfn = max_pfn;
196 set_max_mapnr(max_low_pfn);
197
198 #ifdef CONFIG_BLK_DEV_INITRD
199 setup_initrd();
200 #endif /* CONFIG_BLK_DEV_INITRD */
201
202 /*
203 * Avoid using early_init_fdt_reserve_self() since __pa() does
204 * not work for DTB pointers that are fixmap addresses
205 */
206 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
207
208 early_init_fdt_scan_reserved_mem();
209 memblock_allow_resize();
210 memblock_dump_all();
211 }
212
213 #ifdef CONFIG_MMU
214 static struct pt_alloc_ops pt_ops;
215
216 unsigned long va_pa_offset;
217 EXPORT_SYMBOL(va_pa_offset);
218 unsigned long pfn_base;
219 EXPORT_SYMBOL(pfn_base);
220
221 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
222 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
223 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
224
225 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
226
__set_fixmap(enum fixed_addresses idx,phys_addr_t phys,pgprot_t prot)227 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
228 {
229 unsigned long addr = __fix_to_virt(idx);
230 pte_t *ptep;
231
232 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
233
234 ptep = &fixmap_pte[pte_index(addr)];
235
236 if (pgprot_val(prot))
237 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
238 else
239 pte_clear(&init_mm, addr, ptep);
240 local_flush_tlb_page(addr);
241 }
242
get_pte_virt_early(phys_addr_t pa)243 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
244 {
245 return (pte_t *)((uintptr_t)pa);
246 }
247
get_pte_virt_fixmap(phys_addr_t pa)248 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
249 {
250 clear_fixmap(FIX_PTE);
251 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
252 }
253
get_pte_virt_late(phys_addr_t pa)254 static inline pte_t *get_pte_virt_late(phys_addr_t pa)
255 {
256 return (pte_t *) __va(pa);
257 }
258
alloc_pte_early(uintptr_t va)259 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
260 {
261 /*
262 * We only create PMD or PGD early mappings so we
263 * should never reach here with MMU disabled.
264 */
265 BUG();
266 }
267
alloc_pte_fixmap(uintptr_t va)268 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
269 {
270 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
271 }
272
alloc_pte_late(uintptr_t va)273 static phys_addr_t alloc_pte_late(uintptr_t va)
274 {
275 unsigned long vaddr;
276
277 vaddr = __get_free_page(GFP_KERNEL);
278 if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)))
279 BUG();
280 return __pa(vaddr);
281 }
282
create_pte_mapping(pte_t * ptep,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)283 static void __init create_pte_mapping(pte_t *ptep,
284 uintptr_t va, phys_addr_t pa,
285 phys_addr_t sz, pgprot_t prot)
286 {
287 uintptr_t pte_idx = pte_index(va);
288
289 BUG_ON(sz != PAGE_SIZE);
290
291 if (pte_none(ptep[pte_idx]))
292 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
293 }
294
295 #ifndef __PAGETABLE_PMD_FOLDED
296
297 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
298 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
299 pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
300 pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
301
get_pmd_virt_early(phys_addr_t pa)302 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
303 {
304 /* Before MMU is enabled */
305 return (pmd_t *)((uintptr_t)pa);
306 }
307
get_pmd_virt_fixmap(phys_addr_t pa)308 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
309 {
310 clear_fixmap(FIX_PMD);
311 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
312 }
313
get_pmd_virt_late(phys_addr_t pa)314 static pmd_t *get_pmd_virt_late(phys_addr_t pa)
315 {
316 return (pmd_t *) __va(pa);
317 }
318
alloc_pmd_early(uintptr_t va)319 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
320 {
321 BUG_ON((va - PAGE_OFFSET) >> PGDIR_SHIFT);
322
323 return (uintptr_t)early_pmd;
324 }
325
alloc_pmd_fixmap(uintptr_t va)326 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
327 {
328 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
329 }
330
alloc_pmd_late(uintptr_t va)331 static phys_addr_t alloc_pmd_late(uintptr_t va)
332 {
333 unsigned long vaddr;
334
335 vaddr = __get_free_page(GFP_KERNEL);
336 BUG_ON(!vaddr);
337 return __pa(vaddr);
338 }
339
create_pmd_mapping(pmd_t * pmdp,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)340 static void __init create_pmd_mapping(pmd_t *pmdp,
341 uintptr_t va, phys_addr_t pa,
342 phys_addr_t sz, pgprot_t prot)
343 {
344 pte_t *ptep;
345 phys_addr_t pte_phys;
346 uintptr_t pmd_idx = pmd_index(va);
347
348 if (sz == PMD_SIZE) {
349 if (pmd_none(pmdp[pmd_idx]))
350 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
351 return;
352 }
353
354 if (pmd_none(pmdp[pmd_idx])) {
355 pte_phys = pt_ops.alloc_pte(va);
356 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
357 ptep = pt_ops.get_pte_virt(pte_phys);
358 memset(ptep, 0, PAGE_SIZE);
359 } else {
360 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
361 ptep = pt_ops.get_pte_virt(pte_phys);
362 }
363
364 create_pte_mapping(ptep, va, pa, sz, prot);
365 }
366
367 #define pgd_next_t pmd_t
368 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va)
369 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
370 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
371 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
372 #define fixmap_pgd_next fixmap_pmd
373 #else
374 #define pgd_next_t pte_t
375 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
376 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
377 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
378 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
379 #define fixmap_pgd_next fixmap_pte
380 #endif
381
create_pgd_mapping(pgd_t * pgdp,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)382 void __init create_pgd_mapping(pgd_t *pgdp,
383 uintptr_t va, phys_addr_t pa,
384 phys_addr_t sz, pgprot_t prot)
385 {
386 pgd_next_t *nextp;
387 phys_addr_t next_phys;
388 uintptr_t pgd_idx = pgd_index(va);
389
390 if (sz == PGDIR_SIZE) {
391 if (pgd_val(pgdp[pgd_idx]) == 0)
392 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
393 return;
394 }
395
396 if (pgd_val(pgdp[pgd_idx]) == 0) {
397 next_phys = alloc_pgd_next(va);
398 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
399 nextp = get_pgd_next_virt(next_phys);
400 memset(nextp, 0, PAGE_SIZE);
401 } else {
402 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
403 nextp = get_pgd_next_virt(next_phys);
404 }
405
406 create_pgd_next_mapping(nextp, va, pa, sz, prot);
407 }
408
best_map_size(phys_addr_t base,phys_addr_t size)409 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
410 {
411 /* Upgrade to PMD_SIZE mappings whenever possible */
412 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
413 return PAGE_SIZE;
414
415 return PMD_SIZE;
416 }
417
418 /*
419 * setup_vm() is called from head.S with MMU-off.
420 *
421 * Following requirements should be honoured for setup_vm() to work
422 * correctly:
423 * 1) It should use PC-relative addressing for accessing kernel symbols.
424 * To achieve this we always use GCC cmodel=medany.
425 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
426 * so disable compiler instrumentation when FTRACE is enabled.
427 *
428 * Currently, the above requirements are honoured by using custom CFLAGS
429 * for init.o in mm/Makefile.
430 */
431
432 #ifndef __riscv_cmodel_medany
433 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
434 #endif
435
setup_vm(uintptr_t dtb_pa)436 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
437 {
438 uintptr_t va, pa, end_va;
439 uintptr_t load_pa = (uintptr_t)(&_start);
440 uintptr_t load_sz = (uintptr_t)(&_end) - load_pa;
441 uintptr_t map_size;
442 #ifndef __PAGETABLE_PMD_FOLDED
443 pmd_t fix_bmap_spmd, fix_bmap_epmd;
444 #endif
445
446 va_pa_offset = PAGE_OFFSET - load_pa;
447 pfn_base = PFN_DOWN(load_pa);
448
449 /*
450 * Enforce boot alignment requirements of RV32 and
451 * RV64 by only allowing PMD or PGD mappings.
452 */
453 map_size = PMD_SIZE;
454
455 /* Sanity check alignment and size */
456 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
457 BUG_ON((load_pa % map_size) != 0);
458
459 pt_ops.alloc_pte = alloc_pte_early;
460 pt_ops.get_pte_virt = get_pte_virt_early;
461 #ifndef __PAGETABLE_PMD_FOLDED
462 pt_ops.alloc_pmd = alloc_pmd_early;
463 pt_ops.get_pmd_virt = get_pmd_virt_early;
464 #endif
465 /* Setup early PGD for fixmap */
466 create_pgd_mapping(early_pg_dir, FIXADDR_START,
467 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
468
469 #ifndef __PAGETABLE_PMD_FOLDED
470 /* Setup fixmap PMD */
471 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
472 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
473 /* Setup trampoline PGD and PMD */
474 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
475 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
476 create_pmd_mapping(trampoline_pmd, PAGE_OFFSET,
477 load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
478 #else
479 /* Setup trampoline PGD */
480 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
481 load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
482 #endif
483
484 /*
485 * Setup early PGD covering entire kernel which will allows
486 * us to reach paging_init(). We map all memory banks later
487 * in setup_vm_final() below.
488 */
489 end_va = PAGE_OFFSET + load_sz;
490 for (va = PAGE_OFFSET; va < end_va; va += map_size)
491 create_pgd_mapping(early_pg_dir, va,
492 load_pa + (va - PAGE_OFFSET),
493 map_size, PAGE_KERNEL_EXEC);
494
495 #ifndef __PAGETABLE_PMD_FOLDED
496 /* Setup early PMD for DTB */
497 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
498 (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
499 /* Create two consecutive PMD mappings for FDT early scan */
500 pa = dtb_pa & ~(PMD_SIZE - 1);
501 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
502 pa, PMD_SIZE, PAGE_KERNEL);
503 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
504 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
505 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
506 #else
507 /* Create two consecutive PGD mappings for FDT early scan */
508 pa = dtb_pa & ~(PGDIR_SIZE - 1);
509 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
510 pa, PGDIR_SIZE, PAGE_KERNEL);
511 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
512 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
513 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
514 #endif
515 dtb_early_pa = dtb_pa;
516
517 /*
518 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
519 * range can not span multiple pmds.
520 */
521 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
522 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
523
524 #ifndef __PAGETABLE_PMD_FOLDED
525 /*
526 * Early ioremap fixmap is already created as it lies within first 2MB
527 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
528 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
529 * the user if not.
530 */
531 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
532 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
533 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
534 WARN_ON(1);
535 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
536 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
537 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
538 fix_to_virt(FIX_BTMAP_BEGIN));
539 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
540 fix_to_virt(FIX_BTMAP_END));
541
542 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
543 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
544 }
545 #endif
546 }
547
setup_vm_final(void)548 static void __init setup_vm_final(void)
549 {
550 uintptr_t va, map_size;
551 phys_addr_t pa, start, end;
552 u64 i;
553
554 /**
555 * MMU is enabled at this point. But page table setup is not complete yet.
556 * fixmap page table alloc functions should be used at this point
557 */
558 pt_ops.alloc_pte = alloc_pte_fixmap;
559 pt_ops.get_pte_virt = get_pte_virt_fixmap;
560 #ifndef __PAGETABLE_PMD_FOLDED
561 pt_ops.alloc_pmd = alloc_pmd_fixmap;
562 pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
563 #endif
564 /* Setup swapper PGD for fixmap */
565 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
566 __pa_symbol(fixmap_pgd_next),
567 PGDIR_SIZE, PAGE_TABLE);
568
569 /* Map all memory banks */
570 for_each_mem_range(i, &start, &end) {
571 if (start >= end)
572 break;
573 if (start <= __pa(PAGE_OFFSET) &&
574 __pa(PAGE_OFFSET) < end)
575 start = __pa(PAGE_OFFSET);
576
577 map_size = best_map_size(start, end - start);
578 for (pa = start; pa < end; pa += map_size) {
579 va = (uintptr_t)__va(pa);
580 create_pgd_mapping(swapper_pg_dir, va, pa,
581 map_size, PAGE_KERNEL_EXEC);
582 }
583 }
584
585 /* Clear fixmap PTE and PMD mappings */
586 clear_fixmap(FIX_PTE);
587 clear_fixmap(FIX_PMD);
588
589 /* Move to swapper page table */
590 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
591 local_flush_tlb_all();
592
593 /* generic page allocation functions must be used to setup page table */
594 pt_ops.alloc_pte = alloc_pte_late;
595 pt_ops.get_pte_virt = get_pte_virt_late;
596 #ifndef __PAGETABLE_PMD_FOLDED
597 pt_ops.alloc_pmd = alloc_pmd_late;
598 pt_ops.get_pmd_virt = get_pmd_virt_late;
599 #endif
600 }
601 #else
setup_vm(uintptr_t dtb_pa)602 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
603 {
604 #ifdef CONFIG_BUILTIN_DTB
605 dtb_early_va = soc_lookup_builtin_dtb();
606 if (!dtb_early_va) {
607 /* Fallback to first available DTS */
608 dtb_early_va = (void *) __dtb_start;
609 }
610 #else
611 dtb_early_va = (void *)dtb_pa;
612 #endif
613 dtb_early_pa = dtb_pa;
614 }
615
setup_vm_final(void)616 static inline void setup_vm_final(void)
617 {
618 }
619 #endif /* CONFIG_MMU */
620
621 #ifdef CONFIG_STRICT_KERNEL_RWX
mark_rodata_ro(void)622 void mark_rodata_ro(void)
623 {
624 unsigned long text_start = (unsigned long)_text;
625 unsigned long text_end = (unsigned long)_etext;
626 unsigned long rodata_start = (unsigned long)__start_rodata;
627 unsigned long data_start = (unsigned long)_data;
628 unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn)));
629
630 set_memory_ro(text_start, (text_end - text_start) >> PAGE_SHIFT);
631 set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
632 set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
633 set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT);
634
635 debug_checkwx();
636 }
637 #endif
638
resource_init(void)639 static void __init resource_init(void)
640 {
641 struct memblock_region *region;
642
643 for_each_mem_region(region) {
644 struct resource *res;
645
646 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
647 if (!res)
648 panic("%s: Failed to allocate %zu bytes\n", __func__,
649 sizeof(struct resource));
650
651 if (memblock_is_nomap(region)) {
652 res->name = "reserved";
653 res->flags = IORESOURCE_MEM;
654 } else {
655 res->name = "System RAM";
656 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
657 }
658 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
659 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
660
661 request_resource(&iomem_resource, res);
662 }
663 }
664
paging_init(void)665 void __init paging_init(void)
666 {
667 setup_vm_final();
668 sparse_init();
669 setup_zero_page();
670 zone_sizes_init();
671 resource_init();
672 }
673
674 #ifdef CONFIG_SPARSEMEM_VMEMMAP
vmemmap_populate(unsigned long start,unsigned long end,int node,struct vmem_altmap * altmap)675 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
676 struct vmem_altmap *altmap)
677 {
678 return vmemmap_populate_basepages(start, end, node, NULL);
679 }
680 #endif
681