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59fd53cd GH |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (C) 1995-2005 Russell King | |
3 | // Copyright (C) 2012 ARM Ltd. | |
4 | // Copyright (C) 2013-2017 Andes Technology Corporation | |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/errno.h> | |
8 | #include <linux/swap.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/bootmem.h> | |
11 | #include <linux/mman.h> | |
12 | #include <linux/nodemask.h> | |
13 | #include <linux/initrd.h> | |
14 | #include <linux/highmem.h> | |
15 | #include <linux/memblock.h> | |
16 | ||
17 | #include <asm/sections.h> | |
18 | #include <asm/setup.h> | |
19 | #include <asm/tlb.h> | |
20 | #include <asm/page.h> | |
21 | ||
22 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
23 | DEFINE_SPINLOCK(anon_alias_lock); | |
24 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
25 | extern unsigned long phys_initrd_start; | |
26 | extern unsigned long phys_initrd_size; | |
27 | ||
28 | /* | |
29 | * empty_zero_page is a special page that is used for | |
30 | * zero-initialized data and COW. | |
31 | */ | |
32 | struct page *empty_zero_page; | |
e3f46243 | 33 | EXPORT_SYMBOL(empty_zero_page); |
59fd53cd GH |
34 | |
35 | static void __init zone_sizes_init(void) | |
36 | { | |
37 | unsigned long zones_size[MAX_NR_ZONES]; | |
38 | ||
39 | /* Clear the zone sizes */ | |
40 | memset(zones_size, 0, sizeof(zones_size)); | |
41 | ||
42 | zones_size[ZONE_NORMAL] = max_low_pfn; | |
43 | #ifdef CONFIG_HIGHMEM | |
44 | zones_size[ZONE_HIGHMEM] = max_pfn; | |
45 | #endif | |
46 | free_area_init(zones_size); | |
47 | ||
48 | } | |
49 | ||
50 | /* | |
51 | * Map all physical memory under high_memory into kernel's address space. | |
52 | * | |
53 | * This is explicitly coded for two-level page tables, so if you need | |
54 | * something else then this needs to change. | |
55 | */ | |
56 | static void __init map_ram(void) | |
57 | { | |
58 | unsigned long v, p, e; | |
59 | pgd_t *pge; | |
60 | pud_t *pue; | |
61 | pmd_t *pme; | |
62 | pte_t *pte; | |
63 | /* These mark extents of read-only kernel pages... | |
64 | * ...from vmlinux.lds.S | |
65 | */ | |
66 | ||
67 | p = (u32) memblock_start_of_DRAM() & PAGE_MASK; | |
68 | e = min((u32) memblock_end_of_DRAM(), (u32) __pa(high_memory)); | |
69 | ||
70 | v = (u32) __va(p); | |
71 | pge = pgd_offset_k(v); | |
72 | ||
73 | while (p < e) { | |
74 | int j; | |
75 | pue = pud_offset(pge, v); | |
76 | pme = pmd_offset(pue, v); | |
77 | ||
78 | if ((u32) pue != (u32) pge || (u32) pme != (u32) pge) { | |
79 | panic("%s: Kernel hardcoded for " | |
80 | "two-level page tables", __func__); | |
81 | } | |
82 | ||
83 | /* Alloc one page for holding PTE's... */ | |
9a8dd708 | 84 | pte = (pte_t *) __va(memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE)); |
59fd53cd GH |
85 | memset(pte, 0, PAGE_SIZE); |
86 | set_pmd(pme, __pmd(__pa(pte) + _PAGE_KERNEL_TABLE)); | |
87 | ||
88 | /* Fill the newly allocated page with PTE'S */ | |
89 | for (j = 0; p < e && j < PTRS_PER_PTE; | |
90 | v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) { | |
91 | /* Create mapping between p and v. */ | |
92 | /* TODO: more fine grant for page access permission */ | |
93 | set_pte(pte, __pte(p + pgprot_val(PAGE_KERNEL))); | |
94 | } | |
95 | ||
96 | pge++; | |
97 | } | |
98 | } | |
99 | static pmd_t *fixmap_pmd_p; | |
100 | static void __init fixedrange_init(void) | |
101 | { | |
102 | unsigned long vaddr; | |
103 | pgd_t *pgd; | |
104 | pud_t *pud; | |
105 | pmd_t *pmd; | |
106 | #ifdef CONFIG_HIGHMEM | |
107 | pte_t *pte; | |
108 | #endif /* CONFIG_HIGHMEM */ | |
109 | ||
110 | /* | |
111 | * Fixed mappings: | |
112 | */ | |
113 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1); | |
114 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
115 | pud = pud_offset(pgd, vaddr); | |
116 | pmd = pmd_offset(pud, vaddr); | |
9a8dd708 | 117 | fixmap_pmd_p = (pmd_t *) __va(memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE)); |
59fd53cd GH |
118 | memset(fixmap_pmd_p, 0, PAGE_SIZE); |
119 | set_pmd(pmd, __pmd(__pa(fixmap_pmd_p) + _PAGE_KERNEL_TABLE)); | |
120 | ||
121 | #ifdef CONFIG_HIGHMEM | |
122 | /* | |
123 | * Permanent kmaps: | |
124 | */ | |
125 | vaddr = PKMAP_BASE; | |
126 | ||
127 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
128 | pud = pud_offset(pgd, vaddr); | |
129 | pmd = pmd_offset(pud, vaddr); | |
9a8dd708 | 130 | pte = (pte_t *) __va(memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE)); |
59fd53cd GH |
131 | memset(pte, 0, PAGE_SIZE); |
132 | set_pmd(pmd, __pmd(__pa(pte) + _PAGE_KERNEL_TABLE)); | |
133 | pkmap_page_table = pte; | |
134 | #endif /* CONFIG_HIGHMEM */ | |
135 | } | |
136 | ||
137 | /* | |
138 | * paging_init() sets up the page tables, initialises the zone memory | |
139 | * maps, and sets up the zero page, bad page and bad page tables. | |
140 | */ | |
141 | void __init paging_init(void) | |
142 | { | |
143 | int i; | |
144 | void *zero_page; | |
145 | ||
146 | pr_info("Setting up paging and PTEs.\n"); | |
147 | /* clear out the init_mm.pgd that will contain the kernel's mappings */ | |
148 | for (i = 0; i < PTRS_PER_PGD; i++) | |
149 | swapper_pg_dir[i] = __pgd(1); | |
150 | ||
151 | map_ram(); | |
152 | ||
153 | fixedrange_init(); | |
154 | ||
155 | /* allocate space for empty_zero_page */ | |
9a8dd708 | 156 | zero_page = __va(memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE)); |
59fd53cd GH |
157 | memset(zero_page, 0, PAGE_SIZE); |
158 | zone_sizes_init(); | |
159 | ||
160 | empty_zero_page = virt_to_page(zero_page); | |
161 | flush_dcache_page(empty_zero_page); | |
162 | } | |
163 | ||
164 | static inline void __init free_highmem(void) | |
165 | { | |
166 | #ifdef CONFIG_HIGHMEM | |
167 | unsigned long pfn; | |
168 | for (pfn = PFN_UP(__pa(high_memory)); pfn < max_pfn; pfn++) { | |
169 | phys_addr_t paddr = (phys_addr_t) pfn << PAGE_SHIFT; | |
170 | if (!memblock_is_reserved(paddr)) | |
171 | free_highmem_page(pfn_to_page(pfn)); | |
172 | } | |
173 | #endif | |
174 | } | |
175 | ||
176 | static void __init set_max_mapnr_init(void) | |
177 | { | |
178 | max_mapnr = max_pfn; | |
179 | } | |
180 | ||
181 | /* | |
182 | * mem_init() marks the free areas in the mem_map and tells us how much | |
183 | * memory is free. This is done after various parts of the system have | |
184 | * claimed their memory after the kernel image. | |
185 | */ | |
186 | void __init mem_init(void) | |
187 | { | |
188 | phys_addr_t memory_start = memblock_start_of_DRAM(); | |
189 | BUG_ON(!mem_map); | |
190 | set_max_mapnr_init(); | |
191 | ||
192 | free_highmem(); | |
193 | ||
194 | /* this will put all low memory onto the freelists */ | |
195 | free_all_bootmem(); | |
196 | mem_init_print_info(NULL); | |
197 | ||
198 | pr_info("virtual kernel memory layout:\n" | |
199 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
200 | #ifdef CONFIG_HIGHMEM | |
201 | " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
202 | #endif | |
203 | " consist : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
204 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
205 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
206 | " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
207 | " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
208 | " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", | |
209 | FIXADDR_START, FIXADDR_TOP, (FIXADDR_TOP - FIXADDR_START) >> 10, | |
210 | #ifdef CONFIG_HIGHMEM | |
211 | PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE, | |
212 | (LAST_PKMAP * PAGE_SIZE) >> 10, | |
213 | #endif | |
214 | CONSISTENT_BASE, CONSISTENT_END, | |
215 | ((CONSISTENT_END) - (CONSISTENT_BASE)) >> 20, VMALLOC_START, | |
216 | (unsigned long)VMALLOC_END, (VMALLOC_END - VMALLOC_START) >> 20, | |
217 | (unsigned long)__va(memory_start), (unsigned long)high_memory, | |
218 | ((unsigned long)high_memory - | |
219 | (unsigned long)__va(memory_start)) >> 20, | |
220 | (unsigned long)&__init_begin, (unsigned long)&__init_end, | |
221 | ((unsigned long)&__init_end - | |
222 | (unsigned long)&__init_begin) >> 10, (unsigned long)&_etext, | |
223 | (unsigned long)&_edata, | |
224 | ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, | |
225 | (unsigned long)&_text, (unsigned long)&_etext, | |
226 | ((unsigned long)&_etext - (unsigned long)&_text) >> 10); | |
227 | ||
228 | /* | |
229 | * Check boundaries twice: Some fundamental inconsistencies can | |
230 | * be detected at build time already. | |
231 | */ | |
232 | #ifdef CONFIG_HIGHMEM | |
233 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > FIXADDR_START); | |
234 | BUILD_BUG_ON((CONSISTENT_END) > PKMAP_BASE); | |
235 | #endif | |
236 | BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); | |
237 | BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END); | |
238 | ||
239 | #ifdef CONFIG_HIGHMEM | |
240 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > FIXADDR_START); | |
241 | BUG_ON(CONSISTENT_END > PKMAP_BASE); | |
242 | #endif | |
243 | BUG_ON(VMALLOC_END > CONSISTENT_BASE); | |
244 | BUG_ON(VMALLOC_START >= VMALLOC_END); | |
245 | BUG_ON((unsigned long)high_memory > VMALLOC_START); | |
246 | ||
247 | return; | |
248 | } | |
249 | ||
250 | void free_initmem(void) | |
251 | { | |
252 | free_initmem_default(-1); | |
253 | } | |
254 | ||
255 | #ifdef CONFIG_BLK_DEV_INITRD | |
256 | void free_initrd_mem(unsigned long start, unsigned long end) | |
257 | { | |
258 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); | |
259 | } | |
260 | #endif | |
261 | ||
262 | void __set_fixmap(enum fixed_addresses idx, | |
263 | phys_addr_t phys, pgprot_t flags) | |
264 | { | |
265 | unsigned long addr = __fix_to_virt(idx); | |
266 | pte_t *pte; | |
267 | ||
268 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); | |
269 | ||
270 | pte = (pte_t *)&fixmap_pmd_p[pte_index(addr)];; | |
271 | ||
272 | if (pgprot_val(flags)) { | |
273 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
274 | } else { | |
275 | pte_clear(&init_mm, addr, pte); | |
276 | flush_tlb_kernel_range(addr, addr + PAGE_SIZE); | |
277 | } | |
278 | } |