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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> | |
13 | #ifdef CONFIG_BLOCK_DEV_RAM | |
14 | #include <linux/blk.h> | |
15 | #endif | |
16 | #include <linux/swap.h> | |
17 | #include <linux/module.h> | |
18 | #include <asm/page.h> | |
19 | #include <asm/pgalloc.h> | |
20 | #include <asm/sections.h> | |
21 | #include <asm/arcregs.h> | |
22 | ||
23 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE); | |
24 | char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE); | |
25 | EXPORT_SYMBOL(empty_zero_page); | |
26 | ||
27 | /* Default tot mem from .config */ | |
28 | static unsigned long arc_mem_sz = CONFIG_ARC_PLAT_SDRAM_SIZE; | |
29 | ||
30 | /* User can over-ride above with "mem=nnn[KkMm]" in cmdline */ | |
31 | static int __init setup_mem_sz(char *str) | |
32 | { | |
33 | arc_mem_sz = memparse(str, NULL) & PAGE_MASK; | |
34 | ||
35 | /* early console might not be setup yet - it will show up later */ | |
36 | pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(arc_mem_sz)); | |
37 | ||
38 | return 0; | |
39 | } | |
40 | early_param("mem", setup_mem_sz); | |
41 | ||
999159a5 VG |
42 | void __init early_init_dt_add_memory_arch(u64 base, u64 size) |
43 | { | |
44 | pr_err("%s(%llx, %llx)\n", __func__, base, size); | |
45 | } | |
46 | ||
c121c506 VG |
47 | /* |
48 | * First memory setup routine called from setup_arch() | |
49 | * 1. setup swapper's mm @init_mm | |
50 | * 2. Count the pages we have and setup bootmem allocator | |
51 | * 3. zone setup | |
52 | */ | |
53 | void __init setup_arch_memory(void) | |
54 | { | |
55 | unsigned long zones_size[MAX_NR_ZONES] = { 0, 0 }; | |
56 | unsigned long end_mem = CONFIG_LINUX_LINK_BASE + arc_mem_sz; | |
57 | ||
58 | init_mm.start_code = (unsigned long)_text; | |
59 | init_mm.end_code = (unsigned long)_etext; | |
60 | init_mm.end_data = (unsigned long)_edata; | |
61 | init_mm.brk = (unsigned long)_end; | |
62 | ||
63 | /* | |
64 | * We do it here, so that memory is correctly instantiated | |
65 | * even if "mem=xxx" cmline over-ride is not given | |
66 | */ | |
67 | memblock_add(CONFIG_LINUX_LINK_BASE, arc_mem_sz); | |
68 | ||
69 | /*------------- externs in mm need setting up ---------------*/ | |
70 | ||
71 | /* first page of system - kernel .vector starts here */ | |
72 | min_low_pfn = PFN_DOWN(CONFIG_LINUX_LINK_BASE); | |
73 | ||
74 | /* Last usable page of low mem (no HIGHMEM yet for ARC port) */ | |
75 | max_low_pfn = max_pfn = PFN_DOWN(end_mem); | |
76 | ||
77 | max_mapnr = num_physpages = max_low_pfn - min_low_pfn; | |
78 | ||
79 | /*------------- reserve kernel image -----------------------*/ | |
80 | memblock_reserve(CONFIG_LINUX_LINK_BASE, | |
81 | __pa(_end) - CONFIG_LINUX_LINK_BASE); | |
82 | ||
83 | memblock_dump_all(); | |
84 | ||
85 | /*-------------- node setup --------------------------------*/ | |
86 | memset(zones_size, 0, sizeof(zones_size)); | |
87 | zones_size[ZONE_NORMAL] = num_physpages; | |
88 | ||
89 | /* | |
90 | * We can't use the helper free_area_init(zones[]) because it uses | |
91 | * PAGE_OFFSET to compute the @min_low_pfn which would be wrong | |
92 | * when our kernel doesn't start at PAGE_OFFSET, i.e. | |
93 | * PAGE_OFFSET != CONFIG_LINUX_LINK_BASE | |
94 | */ | |
95 | free_area_init_node(0, /* node-id */ | |
96 | zones_size, /* num pages per zone */ | |
97 | min_low_pfn, /* first pfn of node */ | |
98 | NULL); /* NO holes */ | |
99 | } | |
100 | ||
101 | /* | |
102 | * mem_init - initializes memory | |
103 | * | |
104 | * Frees up bootmem | |
105 | * Calculates and displays memory available/used | |
106 | */ | |
107 | void __init mem_init(void) | |
108 | { | |
109 | int codesize, datasize, initsize, reserved_pages, free_pages; | |
110 | int tmp; | |
111 | ||
112 | high_memory = (void *)(CONFIG_LINUX_LINK_BASE + arc_mem_sz); | |
113 | ||
114 | totalram_pages = free_all_bootmem(); | |
115 | ||
116 | /* count all reserved pages [kernel code/data/mem_map..] */ | |
117 | reserved_pages = 0; | |
118 | for (tmp = 0; tmp < max_mapnr; tmp++) | |
119 | if (PageReserved(mem_map + tmp)) | |
120 | reserved_pages++; | |
121 | ||
122 | /* XXX: nr_free_pages() is equivalent */ | |
123 | free_pages = max_mapnr - reserved_pages; | |
124 | ||
125 | /* | |
126 | * For the purpose of display below, split the "reserve mem" | |
127 | * kernel code/data is already shown explicitly, | |
128 | * Show any other reservations (mem_map[ ] et al) | |
129 | */ | |
130 | reserved_pages -= (((unsigned int)_end - CONFIG_LINUX_LINK_BASE) >> | |
131 | PAGE_SHIFT); | |
132 | ||
133 | codesize = _etext - _text; | |
134 | datasize = _end - _etext; | |
135 | initsize = __init_end - __init_begin; | |
136 | ||
137 | pr_info("Memory Available: %dM / %ldM (%dK code, %dK data, %dK init, %dK reserv)\n", | |
138 | PAGES_TO_MB(free_pages), | |
139 | TO_MB(arc_mem_sz), | |
140 | TO_KB(codesize), TO_KB(datasize), TO_KB(initsize), | |
141 | PAGES_TO_KB(reserved_pages)); | |
142 | } | |
143 | ||
144 | static void __init free_init_pages(const char *what, unsigned long begin, | |
145 | unsigned long end) | |
146 | { | |
147 | unsigned long addr; | |
148 | ||
149 | pr_info("Freeing %s: %ldk [%lx] to [%lx]\n", | |
150 | what, TO_KB(end - begin), begin, end); | |
151 | ||
152 | /* need to check that the page we free is not a partial page */ | |
153 | for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) { | |
154 | ClearPageReserved(virt_to_page(addr)); | |
155 | init_page_count(virt_to_page(addr)); | |
156 | free_page(addr); | |
157 | totalram_pages++; | |
158 | } | |
159 | } | |
160 | ||
161 | /* | |
162 | * free_initmem: Free all the __init memory. | |
163 | */ | |
164 | void __init_refok free_initmem(void) | |
165 | { | |
166 | free_init_pages("unused kernel memory", | |
167 | (unsigned long)__init_begin, | |
168 | (unsigned long)__init_end); | |
169 | } | |
170 | ||
171 | #ifdef CONFIG_BLK_DEV_INITRD | |
172 | void __init free_initrd_mem(unsigned long start, unsigned long end) | |
173 | { | |
174 | free_init_pages("initrd memory", start, end); | |
175 | } | |
176 | #endif | |
999159a5 VG |
177 | |
178 | #ifdef CONFIG_OF_FLATTREE | |
179 | void __init early_init_dt_setup_initrd_arch(unsigned long start, | |
180 | unsigned long end) | |
181 | { | |
182 | pr_err("%s(%lx, %lx)\n", __func__, start, end); | |
183 | } | |
184 | #endif /* CONFIG_OF_FLATTREE */ |