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c121c506 VG |
1 | /* |
2 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/mm.h> | |
11 | #include <linux/bootmem.h> | |
12 | #include <linux/memblock.h> | |
d6579e99 NC |
13 | #ifdef CONFIG_BLK_DEV_INITRD |
14 | #include <linux/initrd.h> | |
15 | #endif | |
1b10cb21 | 16 | #include <linux/of_fdt.h> |
c121c506 VG |
17 | #include <linux/swap.h> |
18 | #include <linux/module.h> | |
29e33226 | 19 | #include <linux/highmem.h> |
c121c506 VG |
20 | #include <asm/page.h> |
21 | #include <asm/pgalloc.h> | |
22 | #include <asm/sections.h> | |
23 | #include <asm/arcregs.h> | |
24 | ||
25 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE); | |
26 | char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE); | |
27 | EXPORT_SYMBOL(empty_zero_page); | |
28 | ||
6101be5a VG |
29 | static const unsigned long low_mem_start = CONFIG_LINUX_LINK_BASE; |
30 | static unsigned long low_mem_sz; | |
c121c506 | 31 | |
29e33226 VG |
32 | #ifdef CONFIG_HIGHMEM |
33 | static unsigned long min_high_pfn; | |
34 | static u64 high_mem_start; | |
35 | static u64 high_mem_sz; | |
36 | #endif | |
37 | ||
c121c506 VG |
38 | /* User can over-ride above with "mem=nnn[KkMm]" in cmdline */ |
39 | static int __init setup_mem_sz(char *str) | |
40 | { | |
6101be5a | 41 | low_mem_sz = memparse(str, NULL) & PAGE_MASK; |
c121c506 VG |
42 | |
43 | /* early console might not be setup yet - it will show up later */ | |
6101be5a | 44 | pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(low_mem_sz)); |
c121c506 VG |
45 | |
46 | return 0; | |
47 | } | |
48 | early_param("mem", setup_mem_sz); | |
49 | ||
999159a5 VG |
50 | void __init early_init_dt_add_memory_arch(u64 base, u64 size) |
51 | { | |
29e33226 VG |
52 | int in_use = 0; |
53 | ||
54 | if (!low_mem_sz) { | |
ff1c0b6a VG |
55 | if (base != low_mem_start) |
56 | panic("CONFIG_LINUX_LINK_BASE != DT memory { }"); | |
57 | ||
29e33226 VG |
58 | low_mem_sz = size; |
59 | in_use = 1; | |
60 | } else { | |
61 | #ifdef CONFIG_HIGHMEM | |
62 | high_mem_start = base; | |
63 | high_mem_sz = size; | |
64 | in_use = 1; | |
65 | #endif | |
66 | } | |
f759ee57 | 67 | |
29e33226 VG |
68 | pr_info("Memory @ %llx [%lldM] %s\n", |
69 | base, TO_MB(size), !in_use ? "Not used":""); | |
999159a5 VG |
70 | } |
71 | ||
d6579e99 NC |
72 | #ifdef CONFIG_BLK_DEV_INITRD |
73 | static int __init early_initrd(char *p) | |
74 | { | |
75 | unsigned long start, size; | |
76 | char *endp; | |
77 | ||
78 | start = memparse(p, &endp); | |
79 | if (*endp == ',') { | |
80 | size = memparse(endp + 1, NULL); | |
81 | ||
82 | initrd_start = (unsigned long)__va(start); | |
83 | initrd_end = (unsigned long)__va(start + size); | |
84 | } | |
85 | return 0; | |
86 | } | |
87 | early_param("initrd", early_initrd); | |
88 | #endif | |
89 | ||
c121c506 VG |
90 | /* |
91 | * First memory setup routine called from setup_arch() | |
92 | * 1. setup swapper's mm @init_mm | |
93 | * 2. Count the pages we have and setup bootmem allocator | |
94 | * 3. zone setup | |
95 | */ | |
96 | void __init setup_arch_memory(void) | |
97 | { | |
f2e2013f | 98 | unsigned long zones_size[MAX_NR_ZONES]; |
29e33226 | 99 | unsigned long zones_holes[MAX_NR_ZONES]; |
c121c506 VG |
100 | |
101 | init_mm.start_code = (unsigned long)_text; | |
102 | init_mm.end_code = (unsigned long)_etext; | |
103 | init_mm.end_data = (unsigned long)_edata; | |
104 | init_mm.brk = (unsigned long)_end; | |
105 | ||
c121c506 | 106 | /* first page of system - kernel .vector starts here */ |
f2e2013f | 107 | min_low_pfn = ARCH_PFN_OFFSET; |
c121c506 | 108 | |
6101be5a VG |
109 | /* Last usable page of low mem */ |
110 | max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz); | |
c121c506 | 111 | |
29e33226 VG |
112 | #ifdef CONFIG_HIGHMEM |
113 | min_high_pfn = PFN_DOWN(high_mem_start); | |
114 | max_pfn = PFN_DOWN(high_mem_start + high_mem_sz); | |
115 | #endif | |
116 | ||
117 | max_mapnr = max_pfn - min_low_pfn; | |
c121c506 | 118 | |
6101be5a | 119 | /*------------- bootmem allocator setup -----------------------*/ |
29e33226 VG |
120 | |
121 | /* | |
122 | * seed the bootmem allocator after any DT memory node parsing or | |
123 | * "mem=xxx" cmdline overrides have potentially updated @arc_mem_sz | |
124 | * | |
125 | * Only low mem is added, otherwise we have crashes when allocating | |
126 | * mem_map[] itself. NO_BOOTMEM allocates mem_map[] at the end of | |
127 | * avail memory, ending in highmem with a > 32-bit address. However | |
128 | * it then tries to memset it with a truncaed 32-bit handle, causing | |
129 | * the crash | |
130 | */ | |
131 | ||
6101be5a VG |
132 | memblock_add(low_mem_start, low_mem_sz); |
133 | memblock_reserve(low_mem_start, __pa(_end) - low_mem_start); | |
c121c506 | 134 | |
d6579e99 | 135 | #ifdef CONFIG_BLK_DEV_INITRD |
d6579e99 NC |
136 | if (initrd_start) |
137 | memblock_reserve(__pa(initrd_start), initrd_end - initrd_start); | |
138 | #endif | |
139 | ||
1b10cb21 AB |
140 | early_init_fdt_reserve_self(); |
141 | early_init_fdt_scan_reserved_mem(); | |
142 | ||
c121c506 VG |
143 | memblock_dump_all(); |
144 | ||
6101be5a | 145 | /*----------------- node/zones setup --------------------------*/ |
c121c506 | 146 | memset(zones_size, 0, sizeof(zones_size)); |
29e33226 VG |
147 | memset(zones_holes, 0, sizeof(zones_holes)); |
148 | ||
6101be5a | 149 | zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn; |
29e33226 VG |
150 | zones_holes[ZONE_NORMAL] = 0; |
151 | ||
152 | #ifdef CONFIG_HIGHMEM | |
153 | zones_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn; | |
154 | ||
155 | /* This handles the peripheral address space hole */ | |
156 | zones_holes[ZONE_HIGHMEM] = min_high_pfn - max_low_pfn; | |
157 | #endif | |
c121c506 VG |
158 | |
159 | /* | |
160 | * We can't use the helper free_area_init(zones[]) because it uses | |
161 | * PAGE_OFFSET to compute the @min_low_pfn which would be wrong | |
162 | * when our kernel doesn't start at PAGE_OFFSET, i.e. | |
163 | * PAGE_OFFSET != CONFIG_LINUX_LINK_BASE | |
164 | */ | |
165 | free_area_init_node(0, /* node-id */ | |
166 | zones_size, /* num pages per zone */ | |
167 | min_low_pfn, /* first pfn of node */ | |
29e33226 | 168 | zones_holes); /* holes */ |
f2e2013f | 169 | |
29e33226 VG |
170 | #ifdef CONFIG_HIGHMEM |
171 | high_memory = (void *)(min_high_pfn << PAGE_SHIFT); | |
172 | kmap_init(); | |
173 | #endif | |
c121c506 VG |
174 | } |
175 | ||
176 | /* | |
177 | * mem_init - initializes memory | |
178 | * | |
179 | * Frees up bootmem | |
180 | * Calculates and displays memory available/used | |
181 | */ | |
182 | void __init mem_init(void) | |
183 | { | |
29e33226 VG |
184 | #ifdef CONFIG_HIGHMEM |
185 | unsigned long tmp; | |
186 | ||
187 | reset_all_zones_managed_pages(); | |
188 | for (tmp = min_high_pfn; tmp < max_pfn; tmp++) | |
189 | free_highmem_page(pfn_to_page(tmp)); | |
190 | #endif | |
191 | ||
0c988534 | 192 | free_all_bootmem(); |
de35e1b8 | 193 | mem_init_print_info(NULL); |
c121c506 VG |
194 | } |
195 | ||
c121c506 VG |
196 | /* |
197 | * free_initmem: Free all the __init memory. | |
198 | */ | |
199 | void __init_refok free_initmem(void) | |
200 | { | |
dbe67df4 | 201 | free_initmem_default(-1); |
c121c506 VG |
202 | } |
203 | ||
204 | #ifdef CONFIG_BLK_DEV_INITRD | |
205 | void __init free_initrd_mem(unsigned long start, unsigned long end) | |
206 | { | |
dbe67df4 | 207 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
c121c506 VG |
208 | } |
209 | #endif |