xref: /openbmc/linux/arch/riscv/mm/init.c (revision b5f184fb)
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 
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 
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)
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 
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 
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
92 static void print_vm_layout(void) { }
93 #endif /* CONFIG_DEBUG_VM */
94 
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
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 
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 - ARCH_PFN_OFFSET);
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 	early_init_fdt_scan_reserved_mem();
212 	dma_contiguous_reserve(dma32_phys_limit);
213 	memblock_allow_resize();
214 	memblock_dump_all();
215 }
216 
217 #ifdef CONFIG_MMU
218 static struct pt_alloc_ops pt_ops;
219 
220 unsigned long va_pa_offset;
221 EXPORT_SYMBOL(va_pa_offset);
222 unsigned long pfn_base;
223 EXPORT_SYMBOL(pfn_base);
224 
225 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
226 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
227 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
228 
229 #define MAX_EARLY_MAPPING_SIZE	SZ_128M
230 
231 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
232 
233 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
234 {
235 	unsigned long addr = __fix_to_virt(idx);
236 	pte_t *ptep;
237 
238 	BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
239 
240 	ptep = &fixmap_pte[pte_index(addr)];
241 
242 	if (pgprot_val(prot))
243 		set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
244 	else
245 		pte_clear(&init_mm, addr, ptep);
246 	local_flush_tlb_page(addr);
247 }
248 
249 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
250 {
251 	return (pte_t *)((uintptr_t)pa);
252 }
253 
254 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
255 {
256 	clear_fixmap(FIX_PTE);
257 	return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
258 }
259 
260 static inline pte_t *get_pte_virt_late(phys_addr_t pa)
261 {
262 	return (pte_t *) __va(pa);
263 }
264 
265 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
266 {
267 	/*
268 	 * We only create PMD or PGD early mappings so we
269 	 * should never reach here with MMU disabled.
270 	 */
271 	BUG();
272 }
273 
274 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
275 {
276 	return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
277 }
278 
279 static phys_addr_t alloc_pte_late(uintptr_t va)
280 {
281 	unsigned long vaddr;
282 
283 	vaddr = __get_free_page(GFP_KERNEL);
284 	if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)))
285 		BUG();
286 	return __pa(vaddr);
287 }
288 
289 static void __init create_pte_mapping(pte_t *ptep,
290 				      uintptr_t va, phys_addr_t pa,
291 				      phys_addr_t sz, pgprot_t prot)
292 {
293 	uintptr_t pte_idx = pte_index(va);
294 
295 	BUG_ON(sz != PAGE_SIZE);
296 
297 	if (pte_none(ptep[pte_idx]))
298 		ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
299 }
300 
301 #ifndef __PAGETABLE_PMD_FOLDED
302 
303 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
304 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
305 
306 #if MAX_EARLY_MAPPING_SIZE < PGDIR_SIZE
307 #define NUM_EARLY_PMDS		1UL
308 #else
309 #define NUM_EARLY_PMDS		(1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE)
310 #endif
311 pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE);
312 pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
313 
314 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
315 {
316 	/* Before MMU is enabled */
317 	return (pmd_t *)((uintptr_t)pa);
318 }
319 
320 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
321 {
322 	clear_fixmap(FIX_PMD);
323 	return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
324 }
325 
326 static pmd_t *get_pmd_virt_late(phys_addr_t pa)
327 {
328 	return (pmd_t *) __va(pa);
329 }
330 
331 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
332 {
333 	uintptr_t pmd_num;
334 
335 	pmd_num = (va - PAGE_OFFSET) >> PGDIR_SHIFT;
336 	BUG_ON(pmd_num >= NUM_EARLY_PMDS);
337 	return (uintptr_t)&early_pmd[pmd_num * PTRS_PER_PMD];
338 }
339 
340 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
341 {
342 	return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
343 }
344 
345 static phys_addr_t alloc_pmd_late(uintptr_t va)
346 {
347 	unsigned long vaddr;
348 
349 	vaddr = __get_free_page(GFP_KERNEL);
350 	BUG_ON(!vaddr);
351 	return __pa(vaddr);
352 }
353 
354 static void __init create_pmd_mapping(pmd_t *pmdp,
355 				      uintptr_t va, phys_addr_t pa,
356 				      phys_addr_t sz, pgprot_t prot)
357 {
358 	pte_t *ptep;
359 	phys_addr_t pte_phys;
360 	uintptr_t pmd_idx = pmd_index(va);
361 
362 	if (sz == PMD_SIZE) {
363 		if (pmd_none(pmdp[pmd_idx]))
364 			pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
365 		return;
366 	}
367 
368 	if (pmd_none(pmdp[pmd_idx])) {
369 		pte_phys = pt_ops.alloc_pte(va);
370 		pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
371 		ptep = pt_ops.get_pte_virt(pte_phys);
372 		memset(ptep, 0, PAGE_SIZE);
373 	} else {
374 		pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
375 		ptep = pt_ops.get_pte_virt(pte_phys);
376 	}
377 
378 	create_pte_mapping(ptep, va, pa, sz, prot);
379 }
380 
381 #define pgd_next_t		pmd_t
382 #define alloc_pgd_next(__va)	pt_ops.alloc_pmd(__va)
383 #define get_pgd_next_virt(__pa)	pt_ops.get_pmd_virt(__pa)
384 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)	\
385 	create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
386 #define fixmap_pgd_next		fixmap_pmd
387 #else
388 #define pgd_next_t		pte_t
389 #define alloc_pgd_next(__va)	pt_ops.alloc_pte(__va)
390 #define get_pgd_next_virt(__pa)	pt_ops.get_pte_virt(__pa)
391 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)	\
392 	create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
393 #define fixmap_pgd_next		fixmap_pte
394 #endif
395 
396 void __init create_pgd_mapping(pgd_t *pgdp,
397 				      uintptr_t va, phys_addr_t pa,
398 				      phys_addr_t sz, pgprot_t prot)
399 {
400 	pgd_next_t *nextp;
401 	phys_addr_t next_phys;
402 	uintptr_t pgd_idx = pgd_index(va);
403 
404 	if (sz == PGDIR_SIZE) {
405 		if (pgd_val(pgdp[pgd_idx]) == 0)
406 			pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
407 		return;
408 	}
409 
410 	if (pgd_val(pgdp[pgd_idx]) == 0) {
411 		next_phys = alloc_pgd_next(va);
412 		pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
413 		nextp = get_pgd_next_virt(next_phys);
414 		memset(nextp, 0, PAGE_SIZE);
415 	} else {
416 		next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
417 		nextp = get_pgd_next_virt(next_phys);
418 	}
419 
420 	create_pgd_next_mapping(nextp, va, pa, sz, prot);
421 }
422 
423 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
424 {
425 	/* Upgrade to PMD_SIZE mappings whenever possible */
426 	if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
427 		return PAGE_SIZE;
428 
429 	return PMD_SIZE;
430 }
431 
432 /*
433  * setup_vm() is called from head.S with MMU-off.
434  *
435  * Following requirements should be honoured for setup_vm() to work
436  * correctly:
437  * 1) It should use PC-relative addressing for accessing kernel symbols.
438  *    To achieve this we always use GCC cmodel=medany.
439  * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
440  *    so disable compiler instrumentation when FTRACE is enabled.
441  *
442  * Currently, the above requirements are honoured by using custom CFLAGS
443  * for init.o in mm/Makefile.
444  */
445 
446 #ifndef __riscv_cmodel_medany
447 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
448 #endif
449 
450 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
451 {
452 	uintptr_t va, pa, end_va;
453 	uintptr_t load_pa = (uintptr_t)(&_start);
454 	uintptr_t load_sz = (uintptr_t)(&_end) - load_pa;
455 	uintptr_t map_size = best_map_size(load_pa, MAX_EARLY_MAPPING_SIZE);
456 #ifndef __PAGETABLE_PMD_FOLDED
457 	pmd_t fix_bmap_spmd, fix_bmap_epmd;
458 #endif
459 
460 	va_pa_offset = PAGE_OFFSET - load_pa;
461 	pfn_base = PFN_DOWN(load_pa);
462 
463 	/*
464 	 * Enforce boot alignment requirements of RV32 and
465 	 * RV64 by only allowing PMD or PGD mappings.
466 	 */
467 	BUG_ON(map_size == PAGE_SIZE);
468 
469 	/* Sanity check alignment and size */
470 	BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
471 	BUG_ON((load_pa % map_size) != 0);
472 	BUG_ON(load_sz > MAX_EARLY_MAPPING_SIZE);
473 
474 	pt_ops.alloc_pte = alloc_pte_early;
475 	pt_ops.get_pte_virt = get_pte_virt_early;
476 #ifndef __PAGETABLE_PMD_FOLDED
477 	pt_ops.alloc_pmd = alloc_pmd_early;
478 	pt_ops.get_pmd_virt = get_pmd_virt_early;
479 #endif
480 	/* Setup early PGD for fixmap */
481 	create_pgd_mapping(early_pg_dir, FIXADDR_START,
482 			   (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
483 
484 #ifndef __PAGETABLE_PMD_FOLDED
485 	/* Setup fixmap PMD */
486 	create_pmd_mapping(fixmap_pmd, FIXADDR_START,
487 			   (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
488 	/* Setup trampoline PGD and PMD */
489 	create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
490 			   (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
491 	create_pmd_mapping(trampoline_pmd, PAGE_OFFSET,
492 			   load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
493 #else
494 	/* Setup trampoline PGD */
495 	create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
496 			   load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
497 #endif
498 
499 	/*
500 	 * Setup early PGD covering entire kernel which will allows
501 	 * us to reach paging_init(). We map all memory banks later
502 	 * in setup_vm_final() below.
503 	 */
504 	end_va = PAGE_OFFSET + load_sz;
505 	for (va = PAGE_OFFSET; va < end_va; va += map_size)
506 		create_pgd_mapping(early_pg_dir, va,
507 				   load_pa + (va - PAGE_OFFSET),
508 				   map_size, PAGE_KERNEL_EXEC);
509 
510 #ifndef __PAGETABLE_PMD_FOLDED
511 	/* Setup early PMD for DTB */
512 	create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
513 			   (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
514 	/* Create two consecutive PMD mappings for FDT early scan */
515 	pa = dtb_pa & ~(PMD_SIZE - 1);
516 	create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
517 			   pa, PMD_SIZE, PAGE_KERNEL);
518 	create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
519 			   pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
520 	dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
521 #else
522 	/* Create two consecutive PGD mappings for FDT early scan */
523 	pa = dtb_pa & ~(PGDIR_SIZE - 1);
524 	create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
525 			   pa, PGDIR_SIZE, PAGE_KERNEL);
526 	create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
527 			   pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
528 	dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
529 #endif
530 	dtb_early_pa = dtb_pa;
531 
532 	/*
533 	 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
534 	 * range can not span multiple pmds.
535 	 */
536 	BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
537 		     != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
538 
539 #ifndef __PAGETABLE_PMD_FOLDED
540 	/*
541 	 * Early ioremap fixmap is already created as it lies within first 2MB
542 	 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
543 	 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
544 	 * the user if not.
545 	 */
546 	fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
547 	fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
548 	if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
549 		WARN_ON(1);
550 		pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
551 			pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
552 		pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
553 			fix_to_virt(FIX_BTMAP_BEGIN));
554 		pr_warn("fix_to_virt(FIX_BTMAP_END):   %08lx\n",
555 			fix_to_virt(FIX_BTMAP_END));
556 
557 		pr_warn("FIX_BTMAP_END:       %d\n", FIX_BTMAP_END);
558 		pr_warn("FIX_BTMAP_BEGIN:     %d\n", FIX_BTMAP_BEGIN);
559 	}
560 #endif
561 }
562 
563 static void __init setup_vm_final(void)
564 {
565 	uintptr_t va, map_size;
566 	phys_addr_t pa, start, end;
567 	u64 i;
568 
569 	/**
570 	 * MMU is enabled at this point. But page table setup is not complete yet.
571 	 * fixmap page table alloc functions should be used at this point
572 	 */
573 	pt_ops.alloc_pte = alloc_pte_fixmap;
574 	pt_ops.get_pte_virt = get_pte_virt_fixmap;
575 #ifndef __PAGETABLE_PMD_FOLDED
576 	pt_ops.alloc_pmd = alloc_pmd_fixmap;
577 	pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
578 #endif
579 	/* Setup swapper PGD for fixmap */
580 	create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
581 			   __pa_symbol(fixmap_pgd_next),
582 			   PGDIR_SIZE, PAGE_TABLE);
583 
584 	/* Map all memory banks */
585 	for_each_mem_range(i, &start, &end) {
586 		if (start >= end)
587 			break;
588 		if (start <= __pa(PAGE_OFFSET) &&
589 		    __pa(PAGE_OFFSET) < end)
590 			start = __pa(PAGE_OFFSET);
591 
592 		map_size = best_map_size(start, end - start);
593 		for (pa = start; pa < end; pa += map_size) {
594 			va = (uintptr_t)__va(pa);
595 			create_pgd_mapping(swapper_pg_dir, va, pa,
596 					   map_size, PAGE_KERNEL_EXEC);
597 		}
598 	}
599 
600 	/* Clear fixmap PTE and PMD mappings */
601 	clear_fixmap(FIX_PTE);
602 	clear_fixmap(FIX_PMD);
603 
604 	/* Move to swapper page table */
605 	csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
606 	local_flush_tlb_all();
607 
608 	/* generic page allocation functions must be used to setup page table */
609 	pt_ops.alloc_pte = alloc_pte_late;
610 	pt_ops.get_pte_virt = get_pte_virt_late;
611 #ifndef __PAGETABLE_PMD_FOLDED
612 	pt_ops.alloc_pmd = alloc_pmd_late;
613 	pt_ops.get_pmd_virt = get_pmd_virt_late;
614 #endif
615 }
616 #else
617 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
618 {
619 #ifdef CONFIG_BUILTIN_DTB
620 	dtb_early_va = soc_lookup_builtin_dtb();
621 	if (!dtb_early_va) {
622 		/* Fallback to first available DTS */
623 		dtb_early_va = (void *) __dtb_start;
624 	}
625 #else
626 	dtb_early_va = (void *)dtb_pa;
627 #endif
628 	dtb_early_pa = dtb_pa;
629 }
630 
631 static inline void setup_vm_final(void)
632 {
633 }
634 #endif /* CONFIG_MMU */
635 
636 #ifdef CONFIG_STRICT_KERNEL_RWX
637 void protect_kernel_text_data(void)
638 {
639 	unsigned long text_start = (unsigned long)_start;
640 	unsigned long init_text_start = (unsigned long)__init_text_begin;
641 	unsigned long init_data_start = (unsigned long)__init_data_begin;
642 	unsigned long rodata_start = (unsigned long)__start_rodata;
643 	unsigned long data_start = (unsigned long)_data;
644 	unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn)));
645 
646 	set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT);
647 	set_memory_ro(init_text_start, (init_data_start - init_text_start) >> PAGE_SHIFT);
648 	set_memory_nx(init_data_start, (rodata_start - init_data_start) >> PAGE_SHIFT);
649 	/* rodata section is marked readonly in mark_rodata_ro */
650 	set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
651 	set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT);
652 }
653 
654 void mark_rodata_ro(void)
655 {
656 	unsigned long rodata_start = (unsigned long)__start_rodata;
657 	unsigned long data_start = (unsigned long)_data;
658 
659 	set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
660 
661 	debug_checkwx();
662 }
663 #endif
664 
665 void __init paging_init(void)
666 {
667 	setup_vm_final();
668 	sparse_init();
669 	setup_zero_page();
670 	zone_sizes_init();
671 }
672 
673 #ifdef CONFIG_SPARSEMEM_VMEMMAP
674 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
675 			       struct vmem_altmap *altmap)
676 {
677 	return vmemmap_populate_basepages(start, end, node, NULL);
678 }
679 #endif
680