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 #include <linux/dma-map-ops.h>
17
18 #include <asm/fixmap.h>
19 #include <asm/tlbflush.h>
20 #include <asm/sections.h>
21 #include <asm/soc.h>
22 #include <asm/io.h>
23 #include <asm/ptdump.h>
24
25 #include "../kernel/head.h"
26
27 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
28 __page_aligned_bss;
29 EXPORT_SYMBOL(empty_zero_page);
30
31 extern char _start[];
32 #define DTB_EARLY_BASE_VA PGDIR_SIZE
33 void *dtb_early_va __initdata;
34 uintptr_t dtb_early_pa __initdata;
35
36 struct pt_alloc_ops {
37 pte_t *(*get_pte_virt)(phys_addr_t pa);
38 phys_addr_t (*alloc_pte)(uintptr_t va);
39 #ifndef __PAGETABLE_PMD_FOLDED
40 pmd_t *(*get_pmd_virt)(phys_addr_t pa);
41 phys_addr_t (*alloc_pmd)(uintptr_t va);
42 #endif
43 };
44
45 static phys_addr_t dma32_phys_limit __ro_after_init;
46
zone_sizes_init(void)47 static void __init zone_sizes_init(void)
48 {
49 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
50
51 #ifdef CONFIG_ZONE_DMA32
52 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
53 #endif
54 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
55
56 free_area_init(max_zone_pfns);
57 }
58
setup_zero_page(void)59 static void setup_zero_page(void)
60 {
61 memset((void *)empty_zero_page, 0, PAGE_SIZE);
62 }
63
64 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
print_mlk(char * name,unsigned long b,unsigned long t)65 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
66 {
67 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
68 (((t) - (b)) >> 10));
69 }
70
print_mlm(char * name,unsigned long b,unsigned long t)71 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
72 {
73 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
74 (((t) - (b)) >> 20));
75 }
76
print_vm_layout(void)77 static void print_vm_layout(void)
78 {
79 pr_notice("Virtual kernel memory layout:\n");
80 print_mlk("fixmap", (unsigned long)FIXADDR_START,
81 (unsigned long)FIXADDR_TOP);
82 print_mlm("pci io", (unsigned long)PCI_IO_START,
83 (unsigned long)PCI_IO_END);
84 print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
85 (unsigned long)VMEMMAP_END);
86 print_mlm("vmalloc", (unsigned long)VMALLOC_START,
87 (unsigned long)VMALLOC_END);
88 print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
89 (unsigned long)high_memory);
90 }
91 #else
print_vm_layout(void)92 static void print_vm_layout(void) { }
93 #endif /* CONFIG_DEBUG_VM */
94
mem_init(void)95 void __init mem_init(void)
96 {
97 #ifdef CONFIG_FLATMEM
98 BUG_ON(!mem_map);
99 #endif /* CONFIG_FLATMEM */
100
101 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
102 memblock_free_all();
103
104 mem_init_print_info(NULL);
105 print_vm_layout();
106 }
107
108 #ifdef CONFIG_BLK_DEV_INITRD
setup_initrd(void)109 static void __init setup_initrd(void)
110 {
111 phys_addr_t start;
112 unsigned long size;
113
114 /* Ignore the virtul address computed during device tree parsing */
115 initrd_start = initrd_end = 0;
116
117 if (!phys_initrd_size)
118 return;
119 /*
120 * Round the memory region to page boundaries as per free_initrd_mem()
121 * This allows us to detect whether the pages overlapping the initrd
122 * are in use, but more importantly, reserves the entire set of pages
123 * as we don't want these pages allocated for other purposes.
124 */
125 start = round_down(phys_initrd_start, PAGE_SIZE);
126 size = phys_initrd_size + (phys_initrd_start - start);
127 size = round_up(size, PAGE_SIZE);
128
129 if (!memblock_is_region_memory(start, size)) {
130 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
131 (u64)start, size);
132 goto disable;
133 }
134
135 if (memblock_is_region_reserved(start, size)) {
136 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
137 (u64)start, size);
138 goto disable;
139 }
140
141 memblock_reserve(start, size);
142 /* Now convert initrd to virtual addresses */
143 initrd_start = (unsigned long)__va(phys_initrd_start);
144 initrd_end = initrd_start + phys_initrd_size;
145 initrd_below_start_ok = 1;
146
147 pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
148 (void *)(initrd_start), size);
149 return;
150 disable:
151 pr_cont(" - disabling initrd\n");
152 initrd_start = 0;
153 initrd_end = 0;
154 }
155 #endif /* CONFIG_BLK_DEV_INITRD */
156
setup_bootmem(void)157 void __init setup_bootmem(void)
158 {
159 phys_addr_t mem_start = 0;
160 phys_addr_t start, dram_end, end = 0;
161 phys_addr_t vmlinux_end = __pa_symbol(&_end);
162 phys_addr_t vmlinux_start = __pa_symbol(&_start);
163 phys_addr_t max_mapped_addr = __pa(~(ulong)0);
164 u64 i;
165
166 /* Find the memory region containing the kernel */
167 for_each_mem_range(i, &start, &end) {
168 phys_addr_t size = end - start;
169 if (!mem_start)
170 mem_start = start;
171 if (start <= vmlinux_start && vmlinux_end <= end)
172 BUG_ON(size == 0);
173 }
174
175 /*
176 * The maximal physical memory size is -PAGE_OFFSET.
177 * Make sure that any memory beyond mem_start + (-PAGE_OFFSET) is removed
178 * as it is unusable by kernel.
179 */
180 memblock_enforce_memory_limit(-PAGE_OFFSET);
181
182 /* Reserve from the start of the kernel to the end of the kernel */
183 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
184
185 dram_end = memblock_end_of_DRAM();
186
187 /*
188 * memblock allocator is not aware of the fact that last 4K bytes of
189 * the addressable memory can not be mapped because of IS_ERR_VALUE
190 * macro. Make sure that last 4k bytes are not usable by memblock
191 * if end of dram is equal to maximum addressable memory.
192 */
193 if (max_mapped_addr == (dram_end - 1))
194 memblock_set_current_limit(max_mapped_addr - 4096);
195
196 max_pfn = PFN_DOWN(dram_end);
197 max_low_pfn = max_pfn;
198 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
199 set_max_mapnr(max_low_pfn);
200
201 #ifdef CONFIG_BLK_DEV_INITRD
202 setup_initrd();
203 #endif /* CONFIG_BLK_DEV_INITRD */
204
205 /*
206 * Avoid using early_init_fdt_reserve_self() since __pa() does
207 * not work for DTB pointers that are fixmap addresses
208 */
209 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
210
211 dma_contiguous_reserve(dma32_phys_limit);
212 memblock_allow_resize();
213 memblock_dump_all();
214 }
215
216 #ifdef CONFIG_MMU
217 static struct pt_alloc_ops pt_ops;
218
219 unsigned long va_pa_offset;
220 EXPORT_SYMBOL(va_pa_offset);
221 unsigned long pfn_base;
222 EXPORT_SYMBOL(pfn_base);
223
224 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
225 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
226 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
227
228 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
229
__set_fixmap(enum fixed_addresses idx,phys_addr_t phys,pgprot_t prot)230 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
231 {
232 unsigned long addr = __fix_to_virt(idx);
233 pte_t *ptep;
234
235 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
236
237 ptep = &fixmap_pte[pte_index(addr)];
238
239 if (pgprot_val(prot))
240 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
241 else
242 pte_clear(&init_mm, addr, ptep);
243 local_flush_tlb_page(addr);
244 }
245
get_pte_virt_early(phys_addr_t pa)246 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
247 {
248 return (pte_t *)((uintptr_t)pa);
249 }
250
get_pte_virt_fixmap(phys_addr_t pa)251 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
252 {
253 clear_fixmap(FIX_PTE);
254 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
255 }
256
get_pte_virt_late(phys_addr_t pa)257 static inline pte_t *get_pte_virt_late(phys_addr_t pa)
258 {
259 return (pte_t *) __va(pa);
260 }
261
alloc_pte_early(uintptr_t va)262 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
263 {
264 /*
265 * We only create PMD or PGD early mappings so we
266 * should never reach here with MMU disabled.
267 */
268 BUG();
269 }
270
alloc_pte_fixmap(uintptr_t va)271 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
272 {
273 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
274 }
275
alloc_pte_late(uintptr_t va)276 static phys_addr_t alloc_pte_late(uintptr_t va)
277 {
278 unsigned long vaddr;
279
280 vaddr = __get_free_page(GFP_KERNEL);
281 if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)))
282 BUG();
283 return __pa(vaddr);
284 }
285
create_pte_mapping(pte_t * ptep,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)286 static void __init create_pte_mapping(pte_t *ptep,
287 uintptr_t va, phys_addr_t pa,
288 phys_addr_t sz, pgprot_t prot)
289 {
290 uintptr_t pte_idx = pte_index(va);
291
292 BUG_ON(sz != PAGE_SIZE);
293
294 if (pte_none(ptep[pte_idx]))
295 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
296 }
297
298 #ifndef __PAGETABLE_PMD_FOLDED
299
300 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
301 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
302 pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
303 pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
304
get_pmd_virt_early(phys_addr_t pa)305 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
306 {
307 /* Before MMU is enabled */
308 return (pmd_t *)((uintptr_t)pa);
309 }
310
get_pmd_virt_fixmap(phys_addr_t pa)311 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
312 {
313 clear_fixmap(FIX_PMD);
314 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
315 }
316
get_pmd_virt_late(phys_addr_t pa)317 static pmd_t *get_pmd_virt_late(phys_addr_t pa)
318 {
319 return (pmd_t *) __va(pa);
320 }
321
alloc_pmd_early(uintptr_t va)322 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
323 {
324 BUG_ON((va - PAGE_OFFSET) >> PGDIR_SHIFT);
325
326 return (uintptr_t)early_pmd;
327 }
328
alloc_pmd_fixmap(uintptr_t va)329 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
330 {
331 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
332 }
333
alloc_pmd_late(uintptr_t va)334 static phys_addr_t alloc_pmd_late(uintptr_t va)
335 {
336 unsigned long vaddr;
337
338 vaddr = __get_free_page(GFP_KERNEL);
339 BUG_ON(!vaddr);
340 return __pa(vaddr);
341 }
342
create_pmd_mapping(pmd_t * pmdp,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)343 static void __init create_pmd_mapping(pmd_t *pmdp,
344 uintptr_t va, phys_addr_t pa,
345 phys_addr_t sz, pgprot_t prot)
346 {
347 pte_t *ptep;
348 phys_addr_t pte_phys;
349 uintptr_t pmd_idx = pmd_index(va);
350
351 if (sz == PMD_SIZE) {
352 if (pmd_none(pmdp[pmd_idx]))
353 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
354 return;
355 }
356
357 if (pmd_none(pmdp[pmd_idx])) {
358 pte_phys = pt_ops.alloc_pte(va);
359 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
360 ptep = pt_ops.get_pte_virt(pte_phys);
361 memset(ptep, 0, PAGE_SIZE);
362 } else {
363 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
364 ptep = pt_ops.get_pte_virt(pte_phys);
365 }
366
367 create_pte_mapping(ptep, va, pa, sz, prot);
368 }
369
370 #define pgd_next_t pmd_t
371 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va)
372 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
373 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
374 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
375 #define fixmap_pgd_next fixmap_pmd
376 #else
377 #define pgd_next_t pte_t
378 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
379 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
380 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
381 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
382 #define fixmap_pgd_next fixmap_pte
383 #endif
384
create_pgd_mapping(pgd_t * pgdp,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)385 void __init create_pgd_mapping(pgd_t *pgdp,
386 uintptr_t va, phys_addr_t pa,
387 phys_addr_t sz, pgprot_t prot)
388 {
389 pgd_next_t *nextp;
390 phys_addr_t next_phys;
391 uintptr_t pgd_idx = pgd_index(va);
392
393 if (sz == PGDIR_SIZE) {
394 if (pgd_val(pgdp[pgd_idx]) == 0)
395 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
396 return;
397 }
398
399 if (pgd_val(pgdp[pgd_idx]) == 0) {
400 next_phys = alloc_pgd_next(va);
401 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
402 nextp = get_pgd_next_virt(next_phys);
403 memset(nextp, 0, PAGE_SIZE);
404 } else {
405 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
406 nextp = get_pgd_next_virt(next_phys);
407 }
408
409 create_pgd_next_mapping(nextp, va, pa, sz, prot);
410 }
411
best_map_size(phys_addr_t base,phys_addr_t size)412 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
413 {
414 /* Upgrade to PMD_SIZE mappings whenever possible */
415 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
416 return PAGE_SIZE;
417
418 return PMD_SIZE;
419 }
420
421 /*
422 * setup_vm() is called from head.S with MMU-off.
423 *
424 * Following requirements should be honoured for setup_vm() to work
425 * correctly:
426 * 1) It should use PC-relative addressing for accessing kernel symbols.
427 * To achieve this we always use GCC cmodel=medany.
428 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
429 * so disable compiler instrumentation when FTRACE is enabled.
430 *
431 * Currently, the above requirements are honoured by using custom CFLAGS
432 * for init.o in mm/Makefile.
433 */
434
435 #ifndef __riscv_cmodel_medany
436 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
437 #endif
438
setup_vm(uintptr_t dtb_pa)439 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
440 {
441 uintptr_t va, pa, end_va;
442 uintptr_t load_pa = (uintptr_t)(&_start);
443 uintptr_t load_sz = (uintptr_t)(&_end) - load_pa;
444 uintptr_t map_size;
445 #ifndef __PAGETABLE_PMD_FOLDED
446 pmd_t fix_bmap_spmd, fix_bmap_epmd;
447 #endif
448
449 va_pa_offset = PAGE_OFFSET - load_pa;
450 pfn_base = PFN_DOWN(load_pa);
451
452 /*
453 * Enforce boot alignment requirements of RV32 and
454 * RV64 by only allowing PMD or PGD mappings.
455 */
456 map_size = PMD_SIZE;
457
458 /* Sanity check alignment and size */
459 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
460 BUG_ON((load_pa % map_size) != 0);
461
462 pt_ops.alloc_pte = alloc_pte_early;
463 pt_ops.get_pte_virt = get_pte_virt_early;
464 #ifndef __PAGETABLE_PMD_FOLDED
465 pt_ops.alloc_pmd = alloc_pmd_early;
466 pt_ops.get_pmd_virt = get_pmd_virt_early;
467 #endif
468 /* Setup early PGD for fixmap */
469 create_pgd_mapping(early_pg_dir, FIXADDR_START,
470 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
471
472 #ifndef __PAGETABLE_PMD_FOLDED
473 /* Setup fixmap PMD */
474 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
475 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
476 /* Setup trampoline PGD and PMD */
477 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
478 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
479 create_pmd_mapping(trampoline_pmd, PAGE_OFFSET,
480 load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
481 #else
482 /* Setup trampoline PGD */
483 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
484 load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
485 #endif
486
487 /*
488 * Setup early PGD covering entire kernel which will allows
489 * us to reach paging_init(). We map all memory banks later
490 * in setup_vm_final() below.
491 */
492 end_va = PAGE_OFFSET + load_sz;
493 for (va = PAGE_OFFSET; va < end_va; va += map_size)
494 create_pgd_mapping(early_pg_dir, va,
495 load_pa + (va - PAGE_OFFSET),
496 map_size, PAGE_KERNEL_EXEC);
497
498 #ifndef __PAGETABLE_PMD_FOLDED
499 /* Setup early PMD for DTB */
500 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
501 (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
502 /* Create two consecutive PMD mappings for FDT early scan */
503 pa = dtb_pa & ~(PMD_SIZE - 1);
504 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
505 pa, PMD_SIZE, PAGE_KERNEL);
506 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
507 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
508 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
509 #else
510 /* Create two consecutive PGD mappings for FDT early scan */
511 pa = dtb_pa & ~(PGDIR_SIZE - 1);
512 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
513 pa, PGDIR_SIZE, PAGE_KERNEL);
514 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
515 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
516 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
517 #endif
518 dtb_early_pa = dtb_pa;
519
520 /*
521 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
522 * range can not span multiple pmds.
523 */
524 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
525 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
526
527 #ifndef __PAGETABLE_PMD_FOLDED
528 /*
529 * Early ioremap fixmap is already created as it lies within first 2MB
530 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
531 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
532 * the user if not.
533 */
534 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
535 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
536 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
537 WARN_ON(1);
538 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
539 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
540 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
541 fix_to_virt(FIX_BTMAP_BEGIN));
542 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
543 fix_to_virt(FIX_BTMAP_END));
544
545 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
546 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
547 }
548 #endif
549 }
550
setup_vm_final(void)551 static void __init setup_vm_final(void)
552 {
553 uintptr_t va, map_size;
554 phys_addr_t pa, start, end;
555 u64 i;
556
557 /**
558 * MMU is enabled at this point. But page table setup is not complete yet.
559 * fixmap page table alloc functions should be used at this point
560 */
561 pt_ops.alloc_pte = alloc_pte_fixmap;
562 pt_ops.get_pte_virt = get_pte_virt_fixmap;
563 #ifndef __PAGETABLE_PMD_FOLDED
564 pt_ops.alloc_pmd = alloc_pmd_fixmap;
565 pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
566 #endif
567 /* Setup swapper PGD for fixmap */
568 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
569 __pa_symbol(fixmap_pgd_next),
570 PGDIR_SIZE, PAGE_TABLE);
571
572 /* Map all memory banks */
573 for_each_mem_range(i, &start, &end) {
574 if (start >= end)
575 break;
576 if (start <= __pa(PAGE_OFFSET) &&
577 __pa(PAGE_OFFSET) < end)
578 start = __pa(PAGE_OFFSET);
579
580 map_size = best_map_size(start, end - start);
581 for (pa = start; pa < end; pa += map_size) {
582 va = (uintptr_t)__va(pa);
583 create_pgd_mapping(swapper_pg_dir, va, pa,
584 map_size, PAGE_KERNEL_EXEC);
585 }
586 }
587
588 /* Clear fixmap PTE and PMD mappings */
589 clear_fixmap(FIX_PTE);
590 clear_fixmap(FIX_PMD);
591
592 /* Move to swapper page table */
593 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
594 local_flush_tlb_all();
595
596 /* generic page allocation functions must be used to setup page table */
597 pt_ops.alloc_pte = alloc_pte_late;
598 pt_ops.get_pte_virt = get_pte_virt_late;
599 #ifndef __PAGETABLE_PMD_FOLDED
600 pt_ops.alloc_pmd = alloc_pmd_late;
601 pt_ops.get_pmd_virt = get_pmd_virt_late;
602 #endif
603 }
604 #else
setup_vm(uintptr_t dtb_pa)605 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
606 {
607 #ifdef CONFIG_BUILTIN_DTB
608 dtb_early_va = soc_lookup_builtin_dtb();
609 if (!dtb_early_va) {
610 /* Fallback to first available DTS */
611 dtb_early_va = (void *) __dtb_start;
612 }
613 #else
614 dtb_early_va = (void *)dtb_pa;
615 #endif
616 dtb_early_pa = dtb_pa;
617 }
618
setup_vm_final(void)619 static inline void setup_vm_final(void)
620 {
621 }
622 #endif /* CONFIG_MMU */
623
624 #ifdef CONFIG_STRICT_KERNEL_RWX
mark_rodata_ro(void)625 void mark_rodata_ro(void)
626 {
627 unsigned long text_start = (unsigned long)_text;
628 unsigned long text_end = (unsigned long)_etext;
629 unsigned long rodata_start = (unsigned long)__start_rodata;
630 unsigned long data_start = (unsigned long)_data;
631 unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn)));
632
633 set_memory_ro(text_start, (text_end - text_start) >> PAGE_SHIFT);
634 set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
635 set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
636 set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT);
637
638 debug_checkwx();
639 }
640 #endif
641
resource_init(void)642 static void __init resource_init(void)
643 {
644 struct memblock_region *region;
645
646 for_each_mem_region(region) {
647 struct resource *res;
648
649 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
650 if (!res)
651 panic("%s: Failed to allocate %zu bytes\n", __func__,
652 sizeof(struct resource));
653
654 if (memblock_is_nomap(region)) {
655 res->name = "reserved";
656 res->flags = IORESOURCE_MEM;
657 } else {
658 res->name = "System RAM";
659 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
660 }
661 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
662 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
663
664 request_resource(&iomem_resource, res);
665 }
666 }
667
paging_init(void)668 void __init paging_init(void)
669 {
670 setup_vm_final();
671 setup_zero_page();
672 }
673
misc_mem_init(void)674 void __init misc_mem_init(void)
675 {
676 sparse_init();
677 zone_sizes_init();
678 resource_init();
679 }
680
681 #ifdef CONFIG_SPARSEMEM_VMEMMAP
vmemmap_populate(unsigned long start,unsigned long end,int node,struct vmem_altmap * altmap)682 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
683 struct vmem_altmap *altmap)
684 {
685 return vmemmap_populate_basepages(start, end, node, NULL);
686 }
687 #endif
688