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