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.
11 * Copyright (C) 2014 - 2016 Cadence Design Systems Inc.
12 *
13 * Chris Zankel <chris@zankel.net>
14 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
15 * Marc Gauthier
16 * Kevin Chea
17 */
18
19 #include <linux/kernel.h>
20 #include <linux/errno.h>
21 #include <linux/memblock.h>
22 #include <linux/gfp.h>
23 #include <linux/highmem.h>
24 #include <linux/swap.h>
25 #include <linux/mman.h>
26 #include <linux/nodemask.h>
27 #include <linux/mm.h>
28 #include <linux/of_fdt.h>
29 #include <linux/dma-map-ops.h>
30
31 #include <asm/bootparam.h>
32 #include <asm/page.h>
33 #include <asm/sections.h>
34 #include <asm/sysmem.h>
35
36 /*
37 * Initialize the bootmem system and give it all low memory we have available.
38 */
39
40 void __init bootmem_init(void)
41 {
42 /* Reserve all memory below PHYS_OFFSET, as memory
43 * accounting doesn't work for pages below that address.
44 *
45 * If PHYS_OFFSET is zero reserve page at address 0:
46 * successfull allocations should never return NULL.
47 */
48 memblock_reserve(0, PHYS_OFFSET ? PHYS_OFFSET : 1);
49
50 early_init_fdt_scan_reserved_mem();
51
52 if (!memblock_phys_mem_size())
53 panic("No memory found!\n");
54
55 min_low_pfn = PFN_UP(memblock_start_of_DRAM());
56 min_low_pfn = max(min_low_pfn, PFN_UP(PHYS_OFFSET));
57 max_pfn = PFN_DOWN(memblock_end_of_DRAM());
58 max_low_pfn = min(max_pfn, MAX_LOW_PFN);
59
60 early_memtest((phys_addr_t)min_low_pfn << PAGE_SHIFT,
61 (phys_addr_t)max_low_pfn << PAGE_SHIFT);
62
63 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
64 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
65
66 memblock_dump_all();
67 }
68
69
70 void __init zones_init(void)
71 {
72 /* All pages are DMA-able, so we put them all in the DMA zone. */
73 unsigned long max_zone_pfn[MAX_NR_ZONES] = {
74 [ZONE_NORMAL] = max_low_pfn,
75 #ifdef CONFIG_HIGHMEM
76 [ZONE_HIGHMEM] = max_pfn,
77 #endif
78 };
79 free_area_init(max_zone_pfn);
80 }
81
82 static void __init free_highpages(void)
83 {
84 #ifdef CONFIG_HIGHMEM
85 unsigned long max_low = max_low_pfn;
86 phys_addr_t range_start, range_end;
87 u64 i;
88
89 /* set highmem page free */
90 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE,
91 &range_start, &range_end, NULL) {
92 unsigned long start = PFN_UP(range_start);
93 unsigned long end = PFN_DOWN(range_end);
94
95 /* Ignore complete lowmem entries */
96 if (end <= max_low)
97 continue;
98
99 /* Truncate partial highmem entries */
100 if (start < max_low)
101 start = max_low;
102
103 for (; start < end; start++)
104 free_highmem_page(pfn_to_page(start));
105 }
106 #endif
107 }
108
109 /*
110 * Initialize memory pages.
111 */
112
113 void __init mem_init(void)
114 {
115 free_highpages();
116
117 max_mapnr = max_pfn - ARCH_PFN_OFFSET;
118 high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT);
119
120 memblock_free_all();
121
122 pr_info("virtual kernel memory layout:\n"
123 #ifdef CONFIG_KASAN
124 " kasan : 0x%08lx - 0x%08lx (%5lu MB)\n"
125 #endif
126 #ifdef CONFIG_MMU
127 " vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n"
128 #endif
129 #ifdef CONFIG_HIGHMEM
130 " pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n"
131 " fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n"
132 #endif
133 " lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n"
134 " .text : 0x%08lx - 0x%08lx (%5lu kB)\n"
135 " .rodata : 0x%08lx - 0x%08lx (%5lu kB)\n"
136 " .data : 0x%08lx - 0x%08lx (%5lu kB)\n"
137 " .init : 0x%08lx - 0x%08lx (%5lu kB)\n"
138 " .bss : 0x%08lx - 0x%08lx (%5lu kB)\n",
139 #ifdef CONFIG_KASAN
140 KASAN_SHADOW_START, KASAN_SHADOW_START + KASAN_SHADOW_SIZE,
141 KASAN_SHADOW_SIZE >> 20,
142 #endif
143 #ifdef CONFIG_MMU
144 VMALLOC_START, VMALLOC_END,
145 (VMALLOC_END - VMALLOC_START) >> 20,
146 #ifdef CONFIG_HIGHMEM
147 PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
148 (LAST_PKMAP*PAGE_SIZE) >> 10,
149 FIXADDR_START, FIXADDR_END,
150 (FIXADDR_END - FIXADDR_START) >> 10,
151 #endif
152 PAGE_OFFSET, PAGE_OFFSET +
153 (max_low_pfn - min_low_pfn) * PAGE_SIZE,
154 #else
155 min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE,
156 #endif
157 ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20,
158 (unsigned long)_text, (unsigned long)_etext,
159 (unsigned long)(_etext - _text) >> 10,
160 (unsigned long)__start_rodata, (unsigned long)__end_rodata,
161 (unsigned long)(__end_rodata - __start_rodata) >> 10,
162 (unsigned long)_sdata, (unsigned long)_edata,
163 (unsigned long)(_edata - _sdata) >> 10,
164 (unsigned long)__init_begin, (unsigned long)__init_end,
165 (unsigned long)(__init_end - __init_begin) >> 10,
166 (unsigned long)__bss_start, (unsigned long)__bss_stop,
167 (unsigned long)(__bss_stop - __bss_start) >> 10);
168 }
169
170 static void __init parse_memmap_one(char *p)
171 {
172 char *oldp;
173 unsigned long start_at, mem_size;
174
175 if (!p)
176 return;
177
178 oldp = p;
179 mem_size = memparse(p, &p);
180 if (p == oldp)
181 return;
182
183 switch (*p) {
184 case '@':
185 start_at = memparse(p + 1, &p);
186 memblock_add(start_at, mem_size);
187 break;
188
189 case '$':
190 start_at = memparse(p + 1, &p);
191 memblock_reserve(start_at, mem_size);
192 break;
193
194 case 0:
195 memblock_reserve(mem_size, -mem_size);
196 break;
197
198 default:
199 pr_warn("Unrecognized memmap syntax: %s\n", p);
200 break;
201 }
202 }
203
204 static int __init parse_memmap_opt(char *str)
205 {
206 while (str) {
207 char *k = strchr(str, ',');
208
209 if (k)
210 *k++ = 0;
211
212 parse_memmap_one(str);
213 str = k;
214 }
215
216 return 0;
217 }
218 early_param("memmap", parse_memmap_opt);
219
220 #ifdef CONFIG_MMU
221 static const pgprot_t protection_map[16] = {
222 [VM_NONE] = PAGE_NONE,
223 [VM_READ] = PAGE_READONLY,
224 [VM_WRITE] = PAGE_COPY,
225 [VM_WRITE | VM_READ] = PAGE_COPY,
226 [VM_EXEC] = PAGE_READONLY_EXEC,
227 [VM_EXEC | VM_READ] = PAGE_READONLY_EXEC,
228 [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC,
229 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC,
230 [VM_SHARED] = PAGE_NONE,
231 [VM_SHARED | VM_READ] = PAGE_READONLY,
232 [VM_SHARED | VM_WRITE] = PAGE_SHARED,
233 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
234 [VM_SHARED | VM_EXEC] = PAGE_READONLY_EXEC,
235 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_EXEC,
236 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC,
237 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC
238 };
239 DECLARE_VM_GET_PAGE_PROT
240 #endif
241
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.