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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 | 32 | #ifdef CONFIG_HIGHMEM |
26f9d5fd | 33 | static unsigned long min_high_pfn, max_high_pfn; |
29e33226 VG |
34 | static u64 high_mem_start; |
35 | static u64 high_mem_sz; | |
36 | #endif | |
37 | ||
26f9d5fd VG |
38 | #ifdef CONFIG_DISCONTIGMEM |
39 | struct pglist_data node_data[MAX_NUMNODES] __read_mostly; | |
40 | EXPORT_SYMBOL(node_data); | |
41 | #endif | |
42 | ||
c121c506 VG |
43 | /* User can over-ride above with "mem=nnn[KkMm]" in cmdline */ |
44 | static int __init setup_mem_sz(char *str) | |
45 | { | |
6101be5a | 46 | low_mem_sz = memparse(str, NULL) & PAGE_MASK; |
c121c506 VG |
47 | |
48 | /* early console might not be setup yet - it will show up later */ | |
6101be5a | 49 | pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(low_mem_sz)); |
c121c506 VG |
50 | |
51 | return 0; | |
52 | } | |
53 | early_param("mem", setup_mem_sz); | |
54 | ||
999159a5 VG |
55 | void __init early_init_dt_add_memory_arch(u64 base, u64 size) |
56 | { | |
29e33226 VG |
57 | int in_use = 0; |
58 | ||
59 | if (!low_mem_sz) { | |
ff1c0b6a VG |
60 | if (base != low_mem_start) |
61 | panic("CONFIG_LINUX_LINK_BASE != DT memory { }"); | |
62 | ||
29e33226 VG |
63 | low_mem_sz = size; |
64 | in_use = 1; | |
65 | } else { | |
66 | #ifdef CONFIG_HIGHMEM | |
67 | high_mem_start = base; | |
68 | high_mem_sz = size; | |
69 | in_use = 1; | |
70 | #endif | |
71 | } | |
f759ee57 | 72 | |
29e33226 VG |
73 | pr_info("Memory @ %llx [%lldM] %s\n", |
74 | base, TO_MB(size), !in_use ? "Not used":""); | |
999159a5 VG |
75 | } |
76 | ||
d6579e99 NC |
77 | #ifdef CONFIG_BLK_DEV_INITRD |
78 | static int __init early_initrd(char *p) | |
79 | { | |
80 | unsigned long start, size; | |
81 | char *endp; | |
82 | ||
83 | start = memparse(p, &endp); | |
84 | if (*endp == ',') { | |
85 | size = memparse(endp + 1, NULL); | |
86 | ||
87 | initrd_start = (unsigned long)__va(start); | |
88 | initrd_end = (unsigned long)__va(start + size); | |
89 | } | |
90 | return 0; | |
91 | } | |
92 | early_param("initrd", early_initrd); | |
93 | #endif | |
94 | ||
c121c506 VG |
95 | /* |
96 | * First memory setup routine called from setup_arch() | |
97 | * 1. setup swapper's mm @init_mm | |
98 | * 2. Count the pages we have and setup bootmem allocator | |
99 | * 3. zone setup | |
100 | */ | |
101 | void __init setup_arch_memory(void) | |
102 | { | |
f2e2013f | 103 | unsigned long zones_size[MAX_NR_ZONES]; |
29e33226 | 104 | unsigned long zones_holes[MAX_NR_ZONES]; |
c121c506 VG |
105 | |
106 | init_mm.start_code = (unsigned long)_text; | |
107 | init_mm.end_code = (unsigned long)_etext; | |
108 | init_mm.end_data = (unsigned long)_edata; | |
109 | init_mm.brk = (unsigned long)_end; | |
110 | ||
c121c506 | 111 | /* first page of system - kernel .vector starts here */ |
f2e2013f | 112 | min_low_pfn = ARCH_PFN_OFFSET; |
c121c506 | 113 | |
6101be5a VG |
114 | /* Last usable page of low mem */ |
115 | max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz); | |
c121c506 | 116 | |
26f9d5fd VG |
117 | #ifdef CONFIG_FLATMEM |
118 | /* pfn_valid() uses this */ | |
119 | max_mapnr = max_low_pfn - min_low_pfn; | |
29e33226 VG |
120 | #endif |
121 | ||
6101be5a | 122 | /*------------- bootmem allocator setup -----------------------*/ |
29e33226 VG |
123 | |
124 | /* | |
125 | * seed the bootmem allocator after any DT memory node parsing or | |
126 | * "mem=xxx" cmdline overrides have potentially updated @arc_mem_sz | |
127 | * | |
128 | * Only low mem is added, otherwise we have crashes when allocating | |
129 | * mem_map[] itself. NO_BOOTMEM allocates mem_map[] at the end of | |
130 | * avail memory, ending in highmem with a > 32-bit address. However | |
131 | * it then tries to memset it with a truncaed 32-bit handle, causing | |
132 | * the crash | |
133 | */ | |
134 | ||
26f9d5fd | 135 | memblock_add_node(low_mem_start, low_mem_sz, 0); |
6101be5a | 136 | memblock_reserve(low_mem_start, __pa(_end) - low_mem_start); |
c121c506 | 137 | |
d6579e99 | 138 | #ifdef CONFIG_BLK_DEV_INITRD |
d6579e99 NC |
139 | if (initrd_start) |
140 | memblock_reserve(__pa(initrd_start), initrd_end - initrd_start); | |
141 | #endif | |
142 | ||
1b10cb21 AB |
143 | early_init_fdt_reserve_self(); |
144 | early_init_fdt_scan_reserved_mem(); | |
145 | ||
c121c506 VG |
146 | memblock_dump_all(); |
147 | ||
6101be5a | 148 | /*----------------- node/zones setup --------------------------*/ |
c121c506 | 149 | memset(zones_size, 0, sizeof(zones_size)); |
29e33226 VG |
150 | memset(zones_holes, 0, sizeof(zones_holes)); |
151 | ||
6101be5a | 152 | zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn; |
29e33226 VG |
153 | zones_holes[ZONE_NORMAL] = 0; |
154 | ||
c121c506 VG |
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 | 166 | #ifdef CONFIG_HIGHMEM |
26f9d5fd VG |
167 | /* |
168 | * Populate a new node with highmem | |
169 | * | |
170 | * On ARC (w/o PAE) HIGHMEM addresses are actually smaller (0 based) | |
171 | * than addresses in normal ala low memory (0x8000_0000 based). | |
172 | * Even with PAE, the huge peripheral space hole would waste a lot of | |
173 | * mem with single mem_map[]. This warrants a mem_map per region design. | |
174 | * Thus HIGHMEM on ARC is imlemented with DISCONTIGMEM. | |
175 | * | |
176 | * DISCONTIGMEM in turns requires multiple nodes. node 0 above is | |
177 | * populated with normal memory zone while node 1 only has highmem | |
178 | */ | |
179 | node_set_online(1); | |
180 | ||
181 | min_high_pfn = PFN_DOWN(high_mem_start); | |
182 | max_high_pfn = PFN_DOWN(high_mem_start + high_mem_sz); | |
183 | ||
184 | zones_size[ZONE_NORMAL] = 0; | |
185 | zones_holes[ZONE_NORMAL] = 0; | |
186 | ||
187 | zones_size[ZONE_HIGHMEM] = max_high_pfn - min_high_pfn; | |
188 | zones_holes[ZONE_HIGHMEM] = 0; | |
189 | ||
190 | free_area_init_node(1, /* node-id */ | |
191 | zones_size, /* num pages per zone */ | |
192 | min_high_pfn, /* first pfn of node */ | |
193 | zones_holes); /* holes */ | |
194 | ||
29e33226 VG |
195 | high_memory = (void *)(min_high_pfn << PAGE_SHIFT); |
196 | kmap_init(); | |
197 | #endif | |
c121c506 VG |
198 | } |
199 | ||
200 | /* | |
201 | * mem_init - initializes memory | |
202 | * | |
203 | * Frees up bootmem | |
204 | * Calculates and displays memory available/used | |
205 | */ | |
206 | void __init mem_init(void) | |
207 | { | |
29e33226 VG |
208 | #ifdef CONFIG_HIGHMEM |
209 | unsigned long tmp; | |
210 | ||
211 | reset_all_zones_managed_pages(); | |
26f9d5fd | 212 | for (tmp = min_high_pfn; tmp < max_high_pfn; tmp++) |
29e33226 VG |
213 | free_highmem_page(pfn_to_page(tmp)); |
214 | #endif | |
215 | ||
0c988534 | 216 | free_all_bootmem(); |
de35e1b8 | 217 | mem_init_print_info(NULL); |
c121c506 VG |
218 | } |
219 | ||
c121c506 VG |
220 | /* |
221 | * free_initmem: Free all the __init memory. | |
222 | */ | |
223 | void __init_refok free_initmem(void) | |
224 | { | |
dbe67df4 | 225 | free_initmem_default(-1); |
c121c506 VG |
226 | } |
227 | ||
228 | #ifdef CONFIG_BLK_DEV_INITRD | |
229 | void __init free_initrd_mem(unsigned long start, unsigned long end) | |
230 | { | |
dbe67df4 | 231 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
c121c506 VG |
232 | } |
233 | #endif |