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 kernel_virt_addr = KERNEL_LINK_ADDR;
28 EXPORT_SYMBOL(kernel_virt_addr);
29
30 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
31 __page_aligned_bss;
32 EXPORT_SYMBOL(empty_zero_page);
33
34 extern char _start[];
35 #define DTB_EARLY_BASE_VA PGDIR_SIZE
36 void *dtb_early_va __initdata;
37 uintptr_t dtb_early_pa __initdata;
38
39 struct pt_alloc_ops {
40 pte_t *(*get_pte_virt)(phys_addr_t pa);
41 phys_addr_t (*alloc_pte)(uintptr_t va);
42 #ifndef __PAGETABLE_PMD_FOLDED
43 pmd_t *(*get_pmd_virt)(phys_addr_t pa);
44 phys_addr_t (*alloc_pmd)(uintptr_t va);
45 #endif
46 };
47
48 static phys_addr_t dma32_phys_limit __ro_after_init;
49
zone_sizes_init(void)50 static void __init zone_sizes_init(void)
51 {
52 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
53
54 #ifdef CONFIG_ZONE_DMA32
55 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
56 #endif
57 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
58
59 free_area_init(max_zone_pfns);
60 }
61
setup_zero_page(void)62 static void setup_zero_page(void)
63 {
64 memset((void *)empty_zero_page, 0, PAGE_SIZE);
65 }
66
67 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
print_mlk(char * name,unsigned long b,unsigned long t)68 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
69 {
70 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
71 (((t) - (b)) >> 10));
72 }
73
print_mlm(char * name,unsigned long b,unsigned long t)74 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
75 {
76 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
77 (((t) - (b)) >> 20));
78 }
79
print_vm_layout(void)80 static void print_vm_layout(void)
81 {
82 pr_notice("Virtual kernel memory layout:\n");
83 print_mlk("fixmap", (unsigned long)FIXADDR_START,
84 (unsigned long)FIXADDR_TOP);
85 print_mlm("pci io", (unsigned long)PCI_IO_START,
86 (unsigned long)PCI_IO_END);
87 print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
88 (unsigned long)VMEMMAP_END);
89 print_mlm("vmalloc", (unsigned long)VMALLOC_START,
90 (unsigned long)VMALLOC_END);
91 print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
92 (unsigned long)high_memory);
93 #ifdef CONFIG_64BIT
94 print_mlm("kernel", (unsigned long)KERNEL_LINK_ADDR,
95 (unsigned long)ADDRESS_SPACE_END);
96 #endif
97 }
98 #else
print_vm_layout(void)99 static void print_vm_layout(void) { }
100 #endif /* CONFIG_DEBUG_VM */
101
mem_init(void)102 void __init mem_init(void)
103 {
104 #ifdef CONFIG_FLATMEM
105 BUG_ON(!mem_map);
106 #endif /* CONFIG_FLATMEM */
107
108 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
109 memblock_free_all();
110
111 mem_init_print_info(NULL);
112 print_vm_layout();
113 }
114
115 #ifdef CONFIG_BLK_DEV_INITRD
setup_initrd(void)116 static void __init setup_initrd(void)
117 {
118 phys_addr_t start;
119 unsigned long size;
120
121 /* Ignore the virtul address computed during device tree parsing */
122 initrd_start = initrd_end = 0;
123
124 if (!phys_initrd_size)
125 return;
126 /*
127 * Round the memory region to page boundaries as per free_initrd_mem()
128 * This allows us to detect whether the pages overlapping the initrd
129 * are in use, but more importantly, reserves the entire set of pages
130 * as we don't want these pages allocated for other purposes.
131 */
132 start = round_down(phys_initrd_start, PAGE_SIZE);
133 size = phys_initrd_size + (phys_initrd_start - start);
134 size = round_up(size, PAGE_SIZE);
135
136 if (!memblock_is_region_memory(start, size)) {
137 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
138 (u64)start, size);
139 goto disable;
140 }
141
142 if (memblock_is_region_reserved(start, size)) {
143 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
144 (u64)start, size);
145 goto disable;
146 }
147
148 memblock_reserve(start, size);
149 /* Now convert initrd to virtual addresses */
150 initrd_start = (unsigned long)__va(phys_initrd_start);
151 initrd_end = initrd_start + phys_initrd_size;
152 initrd_below_start_ok = 1;
153
154 pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
155 (void *)(initrd_start), size);
156 return;
157 disable:
158 pr_cont(" - disabling initrd\n");
159 initrd_start = 0;
160 initrd_end = 0;
161 }
162 #endif /* CONFIG_BLK_DEV_INITRD */
163
setup_bootmem(void)164 void __init setup_bootmem(void)
165 {
166 phys_addr_t mem_start = 0;
167 phys_addr_t start, dram_end, end = 0;
168 phys_addr_t vmlinux_end = __pa_symbol(&_end);
169 phys_addr_t vmlinux_start = __pa_symbol(&_start);
170 phys_addr_t max_mapped_addr = __pa(~(ulong)0);
171 u64 i;
172
173 /*
174 * Reserve from the start of the kernel to the end of the kernel
175 */
176 #if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX)
177 /*
178 * Make sure we align the reservation on PMD_SIZE since we will
179 * map the kernel in the linear mapping as read-only: we do not want
180 * any allocation to happen between _end and the next pmd aligned page.
181 */
182 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
183 #endif
184 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
185
186 /*
187 * The maximal physical memory size is -PAGE_OFFSET.
188 * Make sure that any memory beyond mem_start + (-PAGE_OFFSET) is removed
189 * as it is unusable by kernel.
190 */
191 memblock_enforce_memory_limit(-PAGE_OFFSET);
192
193 /* Reserve from the start of the kernel to the end of the kernel */
194 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
195
196 dram_end = memblock_end_of_DRAM();
197
198 /*
199 * memblock allocator is not aware of the fact that last 4K bytes of
200 * the addressable memory can not be mapped because of IS_ERR_VALUE
201 * macro. Make sure that last 4k bytes are not usable by memblock
202 * if end of dram is equal to maximum addressable memory.
203 */
204 if (max_mapped_addr == (dram_end - 1))
205 memblock_set_current_limit(max_mapped_addr - 4096);
206
207 max_pfn = PFN_DOWN(dram_end);
208 max_low_pfn = max_pfn;
209 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
210 set_max_mapnr(max_low_pfn);
211
212 #ifdef CONFIG_BLK_DEV_INITRD
213 setup_initrd();
214 #endif /* CONFIG_BLK_DEV_INITRD */
215
216 /*
217 * Avoid using early_init_fdt_reserve_self() since __pa() does
218 * not work for DTB pointers that are fixmap addresses
219 */
220 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
221
222 dma_contiguous_reserve(dma32_phys_limit);
223 memblock_allow_resize();
224 memblock_dump_all();
225 }
226
227 #ifdef CONFIG_MMU
228 static struct pt_alloc_ops pt_ops;
229
230 /* Offset between linear mapping virtual address and kernel load address */
231 unsigned long va_pa_offset;
232 EXPORT_SYMBOL(va_pa_offset);
233 #ifdef CONFIG_64BIT
234 /* Offset between kernel mapping virtual address and kernel load address */
235 unsigned long va_kernel_pa_offset;
236 EXPORT_SYMBOL(va_kernel_pa_offset);
237 #endif
238 unsigned long pfn_base;
239 EXPORT_SYMBOL(pfn_base);
240
241 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
242 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
243 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
244
245 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
246
__set_fixmap(enum fixed_addresses idx,phys_addr_t phys,pgprot_t prot)247 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
248 {
249 unsigned long addr = __fix_to_virt(idx);
250 pte_t *ptep;
251
252 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
253
254 ptep = &fixmap_pte[pte_index(addr)];
255
256 if (pgprot_val(prot))
257 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
258 else
259 pte_clear(&init_mm, addr, ptep);
260 local_flush_tlb_page(addr);
261 }
262
get_pte_virt_early(phys_addr_t pa)263 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
264 {
265 return (pte_t *)((uintptr_t)pa);
266 }
267
get_pte_virt_fixmap(phys_addr_t pa)268 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
269 {
270 clear_fixmap(FIX_PTE);
271 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
272 }
273
get_pte_virt_late(phys_addr_t pa)274 static inline pte_t *get_pte_virt_late(phys_addr_t pa)
275 {
276 return (pte_t *) __va(pa);
277 }
278
alloc_pte_early(uintptr_t va)279 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
280 {
281 /*
282 * We only create PMD or PGD early mappings so we
283 * should never reach here with MMU disabled.
284 */
285 BUG();
286 }
287
alloc_pte_fixmap(uintptr_t va)288 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
289 {
290 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
291 }
292
alloc_pte_late(uintptr_t va)293 static phys_addr_t alloc_pte_late(uintptr_t va)
294 {
295 unsigned long vaddr;
296
297 vaddr = __get_free_page(GFP_KERNEL);
298 if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)))
299 BUG();
300 return __pa(vaddr);
301 }
302
create_pte_mapping(pte_t * ptep,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)303 static void __init create_pte_mapping(pte_t *ptep,
304 uintptr_t va, phys_addr_t pa,
305 phys_addr_t sz, pgprot_t prot)
306 {
307 uintptr_t pte_idx = pte_index(va);
308
309 BUG_ON(sz != PAGE_SIZE);
310
311 if (pte_none(ptep[pte_idx]))
312 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
313 }
314
315 #ifndef __PAGETABLE_PMD_FOLDED
316
317 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
318 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
319 pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
320 pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
321
get_pmd_virt_early(phys_addr_t pa)322 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
323 {
324 /* Before MMU is enabled */
325 return (pmd_t *)((uintptr_t)pa);
326 }
327
get_pmd_virt_fixmap(phys_addr_t pa)328 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
329 {
330 clear_fixmap(FIX_PMD);
331 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
332 }
333
get_pmd_virt_late(phys_addr_t pa)334 static pmd_t *get_pmd_virt_late(phys_addr_t pa)
335 {
336 return (pmd_t *) __va(pa);
337 }
338
alloc_pmd_early(uintptr_t va)339 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
340 {
341 BUG_ON((va - kernel_virt_addr) >> PGDIR_SHIFT);
342 return (uintptr_t)early_pmd;
343 }
344
alloc_pmd_fixmap(uintptr_t va)345 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
346 {
347 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
348 }
349
alloc_pmd_late(uintptr_t va)350 static phys_addr_t alloc_pmd_late(uintptr_t va)
351 {
352 unsigned long vaddr;
353
354 vaddr = __get_free_page(GFP_KERNEL);
355 BUG_ON(!vaddr);
356 return __pa(vaddr);
357 }
358
create_pmd_mapping(pmd_t * pmdp,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)359 static void __init create_pmd_mapping(pmd_t *pmdp,
360 uintptr_t va, phys_addr_t pa,
361 phys_addr_t sz, pgprot_t prot)
362 {
363 pte_t *ptep;
364 phys_addr_t pte_phys;
365 uintptr_t pmd_idx = pmd_index(va);
366
367 if (sz == PMD_SIZE) {
368 if (pmd_none(pmdp[pmd_idx]))
369 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
370 return;
371 }
372
373 if (pmd_none(pmdp[pmd_idx])) {
374 pte_phys = pt_ops.alloc_pte(va);
375 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
376 ptep = pt_ops.get_pte_virt(pte_phys);
377 memset(ptep, 0, PAGE_SIZE);
378 } else {
379 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
380 ptep = pt_ops.get_pte_virt(pte_phys);
381 }
382
383 create_pte_mapping(ptep, va, pa, sz, prot);
384 }
385
386 #define pgd_next_t pmd_t
387 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va)
388 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
389 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
390 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
391 #define fixmap_pgd_next fixmap_pmd
392 #else
393 #define pgd_next_t pte_t
394 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
395 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
396 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
397 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
398 #define fixmap_pgd_next fixmap_pte
399 #endif
400
create_pgd_mapping(pgd_t * pgdp,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)401 void __init create_pgd_mapping(pgd_t *pgdp,
402 uintptr_t va, phys_addr_t pa,
403 phys_addr_t sz, pgprot_t prot)
404 {
405 pgd_next_t *nextp;
406 phys_addr_t next_phys;
407 uintptr_t pgd_idx = pgd_index(va);
408
409 if (sz == PGDIR_SIZE) {
410 if (pgd_val(pgdp[pgd_idx]) == 0)
411 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
412 return;
413 }
414
415 if (pgd_val(pgdp[pgd_idx]) == 0) {
416 next_phys = alloc_pgd_next(va);
417 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
418 nextp = get_pgd_next_virt(next_phys);
419 memset(nextp, 0, PAGE_SIZE);
420 } else {
421 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
422 nextp = get_pgd_next_virt(next_phys);
423 }
424
425 create_pgd_next_mapping(nextp, va, pa, sz, prot);
426 }
427
best_map_size(phys_addr_t base,phys_addr_t size)428 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
429 {
430 /* Upgrade to PMD_SIZE mappings whenever possible */
431 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
432 return PAGE_SIZE;
433
434 return PMD_SIZE;
435 }
436
437 /*
438 * setup_vm() is called from head.S with MMU-off.
439 *
440 * Following requirements should be honoured for setup_vm() to work
441 * correctly:
442 * 1) It should use PC-relative addressing for accessing kernel symbols.
443 * To achieve this we always use GCC cmodel=medany.
444 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
445 * so disable compiler instrumentation when FTRACE is enabled.
446 *
447 * Currently, the above requirements are honoured by using custom CFLAGS
448 * for init.o in mm/Makefile.
449 */
450
451 #ifndef __riscv_cmodel_medany
452 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
453 #endif
454
455 uintptr_t load_pa, load_sz;
456
create_kernel_page_table(pgd_t * pgdir,uintptr_t map_size)457 static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size)
458 {
459 uintptr_t va, end_va;
460
461 end_va = kernel_virt_addr + load_sz;
462 for (va = kernel_virt_addr; va < end_va; va += map_size)
463 create_pgd_mapping(pgdir, va,
464 load_pa + (va - kernel_virt_addr),
465 map_size, PAGE_KERNEL_EXEC);
466 }
467
setup_vm(uintptr_t dtb_pa)468 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
469 {
470 uintptr_t pa;
471 uintptr_t map_size;
472 #ifndef __PAGETABLE_PMD_FOLDED
473 pmd_t fix_bmap_spmd, fix_bmap_epmd;
474 #endif
475 load_pa = (uintptr_t)(&_start);
476 load_sz = (uintptr_t)(&_end) - load_pa;
477
478 va_pa_offset = PAGE_OFFSET - load_pa;
479 #ifdef CONFIG_64BIT
480 va_kernel_pa_offset = kernel_virt_addr - load_pa;
481 #endif
482
483 pfn_base = PFN_DOWN(load_pa);
484
485 /*
486 * Enforce boot alignment requirements of RV32 and
487 * RV64 by only allowing PMD or PGD mappings.
488 */
489 map_size = PMD_SIZE;
490
491 /* Sanity check alignment and size */
492 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
493 BUG_ON((load_pa % map_size) != 0);
494
495 pt_ops.alloc_pte = alloc_pte_early;
496 pt_ops.get_pte_virt = get_pte_virt_early;
497 #ifndef __PAGETABLE_PMD_FOLDED
498 pt_ops.alloc_pmd = alloc_pmd_early;
499 pt_ops.get_pmd_virt = get_pmd_virt_early;
500 #endif
501 /* Setup early PGD for fixmap */
502 create_pgd_mapping(early_pg_dir, FIXADDR_START,
503 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
504
505 #ifndef __PAGETABLE_PMD_FOLDED
506 /* Setup fixmap PMD */
507 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
508 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
509 /* Setup trampoline PGD and PMD */
510 create_pgd_mapping(trampoline_pg_dir, kernel_virt_addr,
511 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
512 create_pmd_mapping(trampoline_pmd, kernel_virt_addr,
513 load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
514 #else
515 /* Setup trampoline PGD */
516 create_pgd_mapping(trampoline_pg_dir, kernel_virt_addr,
517 load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
518 #endif
519
520 /*
521 * Setup early PGD covering entire kernel which will allow
522 * us to reach paging_init(). We map all memory banks later
523 * in setup_vm_final() below.
524 */
525 create_kernel_page_table(early_pg_dir, map_size);
526
527 #ifndef __PAGETABLE_PMD_FOLDED
528 /* Setup early PMD for DTB */
529 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
530 (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
531 #ifndef CONFIG_BUILTIN_DTB
532 /* Create two consecutive PMD mappings for FDT early scan */
533 pa = dtb_pa & ~(PMD_SIZE - 1);
534 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
535 pa, PMD_SIZE, PAGE_KERNEL);
536 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
537 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
538 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
539 #else /* CONFIG_BUILTIN_DTB */
540 #ifdef CONFIG_64BIT
541 /*
542 * __va can't be used since it would return a linear mapping address
543 * whereas dtb_early_va will be used before setup_vm_final installs
544 * the linear mapping.
545 */
546 dtb_early_va = kernel_mapping_pa_to_va(dtb_pa);
547 #else
548 dtb_early_va = __va(dtb_pa);
549 #endif /* CONFIG_64BIT */
550 #endif /* CONFIG_BUILTIN_DTB */
551 #else
552 #ifndef CONFIG_BUILTIN_DTB
553 /* Create two consecutive PGD mappings for FDT early scan */
554 pa = dtb_pa & ~(PGDIR_SIZE - 1);
555 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
556 pa, PGDIR_SIZE, PAGE_KERNEL);
557 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
558 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
559 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
560 #else /* CONFIG_BUILTIN_DTB */
561 #ifdef CONFIG_64BIT
562 dtb_early_va = kernel_mapping_pa_to_va(dtb_pa);
563 #else
564 dtb_early_va = __va(dtb_pa);
565 #endif /* CONFIG_64BIT */
566 #endif /* CONFIG_BUILTIN_DTB */
567 #endif
568 dtb_early_pa = dtb_pa;
569
570 /*
571 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
572 * range can not span multiple pmds.
573 */
574 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
575 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
576
577 #ifndef __PAGETABLE_PMD_FOLDED
578 /*
579 * Early ioremap fixmap is already created as it lies within first 2MB
580 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
581 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
582 * the user if not.
583 */
584 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
585 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
586 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
587 WARN_ON(1);
588 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
589 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
590 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
591 fix_to_virt(FIX_BTMAP_BEGIN));
592 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
593 fix_to_virt(FIX_BTMAP_END));
594
595 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
596 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
597 }
598 #endif
599 }
600
601 #ifdef CONFIG_64BIT
protect_kernel_linear_mapping_text_rodata(void)602 void protect_kernel_linear_mapping_text_rodata(void)
603 {
604 unsigned long text_start = (unsigned long)lm_alias(_start);
605 unsigned long init_text_start = (unsigned long)lm_alias(__init_text_begin);
606 unsigned long rodata_start = (unsigned long)lm_alias(__start_rodata);
607 unsigned long data_start = (unsigned long)lm_alias(_data);
608
609 set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT);
610 set_memory_nx(text_start, (init_text_start - text_start) >> PAGE_SHIFT);
611
612 set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
613 set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
614 }
615 #endif
616
setup_vm_final(void)617 static void __init setup_vm_final(void)
618 {
619 uintptr_t va, map_size;
620 phys_addr_t pa, start, end;
621 u64 i;
622
623 /**
624 * MMU is enabled at this point. But page table setup is not complete yet.
625 * fixmap page table alloc functions should be used at this point
626 */
627 pt_ops.alloc_pte = alloc_pte_fixmap;
628 pt_ops.get_pte_virt = get_pte_virt_fixmap;
629 #ifndef __PAGETABLE_PMD_FOLDED
630 pt_ops.alloc_pmd = alloc_pmd_fixmap;
631 pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
632 #endif
633 /* Setup swapper PGD for fixmap */
634 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
635 __pa_symbol(fixmap_pgd_next),
636 PGDIR_SIZE, PAGE_TABLE);
637
638 /* Map all memory banks in the linear mapping */
639 for_each_mem_range(i, &start, &end) {
640 if (start >= end)
641 break;
642 if (start <= __pa(PAGE_OFFSET) &&
643 __pa(PAGE_OFFSET) < end)
644 start = __pa(PAGE_OFFSET);
645
646 map_size = best_map_size(start, end - start);
647 for (pa = start; pa < end; pa += map_size) {
648 va = (uintptr_t)__va(pa);
649 create_pgd_mapping(swapper_pg_dir, va, pa,
650 map_size,
651 #ifdef CONFIG_64BIT
652 PAGE_KERNEL
653 #else
654 PAGE_KERNEL_EXEC
655 #endif
656 );
657
658 }
659 }
660
661 #ifdef CONFIG_64BIT
662 /* Map the kernel */
663 create_kernel_page_table(swapper_pg_dir, PMD_SIZE);
664 #endif
665
666 /* Clear fixmap PTE and PMD mappings */
667 clear_fixmap(FIX_PTE);
668 clear_fixmap(FIX_PMD);
669
670 /* Move to swapper page table */
671 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
672 local_flush_tlb_all();
673
674 /* generic page allocation functions must be used to setup page table */
675 pt_ops.alloc_pte = alloc_pte_late;
676 pt_ops.get_pte_virt = get_pte_virt_late;
677 #ifndef __PAGETABLE_PMD_FOLDED
678 pt_ops.alloc_pmd = alloc_pmd_late;
679 pt_ops.get_pmd_virt = get_pmd_virt_late;
680 #endif
681 }
682 #else
setup_vm(uintptr_t dtb_pa)683 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
684 {
685 #ifdef CONFIG_BUILTIN_DTB
686 dtb_early_va = soc_lookup_builtin_dtb();
687 if (!dtb_early_va) {
688 /* Fallback to first available DTS */
689 dtb_early_va = (void *) __dtb_start;
690 }
691 #else
692 dtb_early_va = (void *)dtb_pa;
693 #endif
694 dtb_early_pa = dtb_pa;
695 }
696
setup_vm_final(void)697 static inline void setup_vm_final(void)
698 {
699 }
700 #endif /* CONFIG_MMU */
701
702 #ifdef CONFIG_STRICT_KERNEL_RWX
protect_kernel_text_data(void)703 void protect_kernel_text_data(void)
704 {
705 unsigned long text_start = (unsigned long)_start;
706 unsigned long init_text_start = (unsigned long)__init_text_begin;
707 unsigned long init_data_start = (unsigned long)__init_data_begin;
708 unsigned long rodata_start = (unsigned long)__start_rodata;
709 unsigned long data_start = (unsigned long)_data;
710 #if defined(CONFIG_64BIT) && defined(CONFIG_MMU)
711 unsigned long end_va = kernel_virt_addr + load_sz;
712 #else
713 unsigned long end_va = (unsigned long)(__va(PFN_PHYS(max_low_pfn)));
714 #endif
715
716 set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT);
717 set_memory_ro(init_text_start, (init_data_start - init_text_start) >> PAGE_SHIFT);
718 set_memory_nx(init_data_start, (rodata_start - init_data_start) >> PAGE_SHIFT);
719 /* rodata section is marked readonly in mark_rodata_ro */
720 set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
721 set_memory_nx(data_start, (end_va - data_start) >> PAGE_SHIFT);
722 }
723
mark_rodata_ro(void)724 void mark_rodata_ro(void)
725 {
726 unsigned long rodata_start = (unsigned long)__start_rodata;
727 unsigned long data_start = (unsigned long)_data;
728
729 set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
730
731 debug_checkwx();
732 }
733 #endif
734
resource_init(void)735 static void __init resource_init(void)
736 {
737 struct memblock_region *region;
738
739 for_each_mem_region(region) {
740 struct resource *res;
741
742 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
743 if (!res)
744 panic("%s: Failed to allocate %zu bytes\n", __func__,
745 sizeof(struct resource));
746
747 if (memblock_is_nomap(region)) {
748 res->name = "reserved";
749 res->flags = IORESOURCE_MEM;
750 } else {
751 res->name = "System RAM";
752 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
753 }
754 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
755 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
756
757 request_resource(&iomem_resource, res);
758 }
759 }
760
paging_init(void)761 void __init paging_init(void)
762 {
763 setup_vm_final();
764 setup_zero_page();
765 }
766
misc_mem_init(void)767 void __init misc_mem_init(void)
768 {
769 sparse_init();
770 zone_sizes_init();
771 resource_init();
772 }
773
774 #ifdef CONFIG_SPARSEMEM_VMEMMAP
vmemmap_populate(unsigned long start,unsigned long end,int node,struct vmem_altmap * altmap)775 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
776 struct vmem_altmap *altmap)
777 {
778 return vmemmap_populate_basepages(start, end, node, NULL);
779 }
780 #endif
781