]>
Commit | Line | Data |
---|---|---|
3f65ce4d CZ |
1 | /* |
2 | * arch/xtensa/mm/init.c | |
3 | * | |
4 | * Derived from MIPS, PPC. | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | * | |
10 | * Copyright (C) 2001 - 2005 Tensilica Inc. | |
0e46c111 | 11 | * Copyright (C) 2014 - 2016 Cadence Design Systems Inc. |
3f65ce4d CZ |
12 | * |
13 | * Chris Zankel <chris@zankel.net> | |
14 | * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> | |
15 | * Marc Gauthier | |
16 | * Kevin Chea | |
17 | */ | |
18 | ||
3f65ce4d CZ |
19 | #include <linux/kernel.h> |
20 | #include <linux/errno.h> | |
57c8a661 | 21 | #include <linux/memblock.h> |
5a0e3ad6 | 22 | #include <linux/gfp.h> |
65559100 | 23 | #include <linux/highmem.h> |
3f65ce4d | 24 | #include <linux/swap.h> |
6656920b CZ |
25 | #include <linux/mman.h> |
26 | #include <linux/nodemask.h> | |
27 | #include <linux/mm.h> | |
4e7c84ec | 28 | #include <linux/of_fdt.h> |
9d2ffe5c | 29 | #include <linux/dma-contiguous.h> |
3f65ce4d | 30 | |
3f65ce4d | 31 | #include <asm/bootparam.h> |
3f65ce4d | 32 | #include <asm/page.h> |
f022d0fa | 33 | #include <asm/sections.h> |
9ba067f9 MF |
34 | #include <asm/sysmem.h> |
35 | ||
3f65ce4d | 36 | /* |
e9d6dca5 | 37 | * Initialize the bootmem system and give it all low memory we have available. |
3f65ce4d CZ |
38 | */ |
39 | ||
40 | void __init bootmem_init(void) | |
41 | { | |
0e46c111 | 42 | /* Reserve all memory below PHYS_OFFSET, as memory |
566fb58e MF |
43 | * accounting doesn't work for pages below that address. |
44 | * | |
0e46c111 | 45 | * If PHYS_OFFSET is zero reserve page at address 0: |
566fb58e MF |
46 | * successfull allocations should never return NULL. |
47 | */ | |
0e46c111 MF |
48 | if (PHYS_OFFSET) |
49 | memblock_reserve(0, PHYS_OFFSET); | |
566fb58e | 50 | else |
0e46c111 | 51 | memblock_reserve(0, 1); |
566fb58e | 52 | |
4e7c84ec | 53 | early_init_fdt_scan_reserved_mem(); |
3f65ce4d | 54 | |
0e46c111 | 55 | if (!memblock_phys_mem_size()) |
3f65ce4d CZ |
56 | panic("No memory found!\n"); |
57 | ||
0e46c111 MF |
58 | min_low_pfn = PFN_UP(memblock_start_of_DRAM()); |
59 | min_low_pfn = max(min_low_pfn, PFN_UP(PHYS_OFFSET)); | |
60 | max_pfn = PFN_DOWN(memblock_end_of_DRAM()); | |
d39af902 | 61 | max_low_pfn = min(max_pfn, MAX_LOW_PFN); |
3f65ce4d | 62 | |
0e46c111 | 63 | memblock_set_current_limit(PFN_PHYS(max_low_pfn)); |
9d2ffe5c | 64 | dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); |
3f65ce4d | 65 | |
0e46c111 | 66 | memblock_dump_all(); |
3f65ce4d CZ |
67 | } |
68 | ||
69 | ||
e5083a63 | 70 | void __init zones_init(void) |
3f65ce4d | 71 | { |
3f65ce4d | 72 | /* All pages are DMA-able, so we put them all in the DMA zone. */ |
65559100 MF |
73 | unsigned long zones_size[MAX_NR_ZONES] = { |
74 | [ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET, | |
3f65ce4d | 75 | #ifdef CONFIG_HIGHMEM |
65559100 | 76 | [ZONE_HIGHMEM] = max_pfn - max_low_pfn, |
3f65ce4d | 77 | #endif |
65559100 | 78 | }; |
c947a585 | 79 | free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL); |
3f65ce4d CZ |
80 | } |
81 | ||
6ac5a11d MF |
82 | #ifdef CONFIG_HIGHMEM |
83 | static void __init free_area_high(unsigned long pfn, unsigned long end) | |
84 | { | |
85 | for (; pfn < end; pfn++) | |
86 | free_highmem_page(pfn_to_page(pfn)); | |
87 | } | |
88 | ||
89 | static void __init free_highpages(void) | |
90 | { | |
91 | unsigned long max_low = max_low_pfn; | |
92 | struct memblock_region *mem, *res; | |
93 | ||
94 | reset_all_zones_managed_pages(); | |
95 | /* set highmem page free */ | |
96 | for_each_memblock(memory, mem) { | |
97 | unsigned long start = memblock_region_memory_base_pfn(mem); | |
98 | unsigned long end = memblock_region_memory_end_pfn(mem); | |
99 | ||
100 | /* Ignore complete lowmem entries */ | |
101 | if (end <= max_low) | |
102 | continue; | |
103 | ||
104 | if (memblock_is_nomap(mem)) | |
105 | continue; | |
106 | ||
107 | /* Truncate partial highmem entries */ | |
108 | if (start < max_low) | |
109 | start = max_low; | |
110 | ||
111 | /* Find and exclude any reserved regions */ | |
112 | for_each_memblock(reserved, res) { | |
113 | unsigned long res_start, res_end; | |
114 | ||
115 | res_start = memblock_region_reserved_base_pfn(res); | |
116 | res_end = memblock_region_reserved_end_pfn(res); | |
117 | ||
118 | if (res_end < start) | |
119 | continue; | |
120 | if (res_start < start) | |
121 | res_start = start; | |
122 | if (res_start > end) | |
123 | res_start = end; | |
124 | if (res_end > end) | |
125 | res_end = end; | |
126 | if (res_start != start) | |
127 | free_area_high(start, res_start); | |
128 | start = res_end; | |
129 | if (start == end) | |
130 | break; | |
131 | } | |
132 | ||
133 | /* And now free anything which remains */ | |
134 | if (start < end) | |
135 | free_area_high(start, end); | |
136 | } | |
137 | } | |
138 | #else | |
139 | static void __init free_highpages(void) | |
140 | { | |
141 | } | |
142 | #endif | |
143 | ||
3f65ce4d CZ |
144 | /* |
145 | * Initialize memory pages. | |
146 | */ | |
147 | ||
148 | void __init mem_init(void) | |
149 | { | |
6ac5a11d | 150 | free_highpages(); |
3f65ce4d | 151 | |
65559100 MF |
152 | max_mapnr = max_pfn - ARCH_PFN_OFFSET; |
153 | high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT); | |
154 | ||
c6ffc5ca | 155 | memblock_free_all(); |
3f65ce4d | 156 | |
808c2c37 | 157 | mem_init_print_info(NULL); |
65559100 | 158 | pr_info("virtual kernel memory layout:\n" |
c633544a MF |
159 | #ifdef CONFIG_KASAN |
160 | " kasan : 0x%08lx - 0x%08lx (%5lu MB)\n" | |
161 | #endif | |
1af1e8a3 MF |
162 | #ifdef CONFIG_MMU |
163 | " vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n" | |
164 | #endif | |
65559100 MF |
165 | #ifdef CONFIG_HIGHMEM |
166 | " pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n" | |
167 | " fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n" | |
5a0b1d78 | 168 | #endif |
fed566ca MF |
169 | " lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n" |
170 | " .text : 0x%08lx - 0x%08lx (%5lu kB)\n" | |
171 | " .rodata : 0x%08lx - 0x%08lx (%5lu kB)\n" | |
172 | " .data : 0x%08lx - 0x%08lx (%5lu kB)\n" | |
173 | " .init : 0x%08lx - 0x%08lx (%5lu kB)\n" | |
174 | " .bss : 0x%08lx - 0x%08lx (%5lu kB)\n", | |
c633544a MF |
175 | #ifdef CONFIG_KASAN |
176 | KASAN_SHADOW_START, KASAN_SHADOW_START + KASAN_SHADOW_SIZE, | |
177 | KASAN_SHADOW_SIZE >> 20, | |
178 | #endif | |
1af1e8a3 MF |
179 | #ifdef CONFIG_MMU |
180 | VMALLOC_START, VMALLOC_END, | |
181 | (VMALLOC_END - VMALLOC_START) >> 20, | |
65559100 MF |
182 | #ifdef CONFIG_HIGHMEM |
183 | PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE, | |
184 | (LAST_PKMAP*PAGE_SIZE) >> 10, | |
185 | FIXADDR_START, FIXADDR_TOP, | |
186 | (FIXADDR_TOP - FIXADDR_START) >> 10, | |
187 | #endif | |
65559100 MF |
188 | PAGE_OFFSET, PAGE_OFFSET + |
189 | (max_low_pfn - min_low_pfn) * PAGE_SIZE, | |
5a0b1d78 MF |
190 | #else |
191 | min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE, | |
192 | #endif | |
fed566ca MF |
193 | ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20, |
194 | (unsigned long)_text, (unsigned long)_etext, | |
195 | (unsigned long)(_etext - _text) >> 10, | |
196 | (unsigned long)__start_rodata, (unsigned long)_sdata, | |
197 | (unsigned long)(_sdata - __start_rodata) >> 10, | |
198 | (unsigned long)_sdata, (unsigned long)_edata, | |
199 | (unsigned long)(_edata - _sdata) >> 10, | |
200 | (unsigned long)__init_begin, (unsigned long)__init_end, | |
201 | (unsigned long)(__init_end - __init_begin) >> 10, | |
202 | (unsigned long)__bss_start, (unsigned long)__bss_stop, | |
203 | (unsigned long)(__bss_stop - __bss_start) >> 10); | |
3f65ce4d CZ |
204 | } |
205 | ||
3f65ce4d CZ |
206 | #ifdef CONFIG_BLK_DEV_INITRD |
207 | extern int initrd_is_mapped; | |
208 | ||
209 | void free_initrd_mem(unsigned long start, unsigned long end) | |
210 | { | |
7acb2c2e | 211 | if (initrd_is_mapped) |
dbe67df4 | 212 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
3f65ce4d CZ |
213 | } |
214 | #endif | |
215 | ||
216 | void free_initmem(void) | |
217 | { | |
dbe67df4 | 218 | free_initmem_default(-1); |
3f65ce4d | 219 | } |
06bd2824 MF |
220 | |
221 | static void __init parse_memmap_one(char *p) | |
222 | { | |
223 | char *oldp; | |
224 | unsigned long start_at, mem_size; | |
225 | ||
226 | if (!p) | |
227 | return; | |
228 | ||
229 | oldp = p; | |
230 | mem_size = memparse(p, &p); | |
231 | if (p == oldp) | |
232 | return; | |
233 | ||
234 | switch (*p) { | |
235 | case '@': | |
236 | start_at = memparse(p + 1, &p); | |
0e46c111 | 237 | memblock_add(start_at, mem_size); |
06bd2824 MF |
238 | break; |
239 | ||
240 | case '$': | |
241 | start_at = memparse(p + 1, &p); | |
0e46c111 | 242 | memblock_reserve(start_at, mem_size); |
06bd2824 MF |
243 | break; |
244 | ||
245 | case 0: | |
0e46c111 | 246 | memblock_reserve(mem_size, -mem_size); |
06bd2824 MF |
247 | break; |
248 | ||
249 | default: | |
250 | pr_warn("Unrecognized memmap syntax: %s\n", p); | |
251 | break; | |
252 | } | |
253 | } | |
254 | ||
255 | static int __init parse_memmap_opt(char *str) | |
256 | { | |
257 | while (str) { | |
258 | char *k = strchr(str, ','); | |
259 | ||
260 | if (k) | |
261 | *k++ = 0; | |
262 | ||
263 | parse_memmap_one(str); | |
264 | str = k; | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | early_param("memmap", parse_memmap_opt); |