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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> | |
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 */ | |
450dd430 | 28 | static unsigned long arc_mem_sz = 0x20000000; /* some default */ |
c121c506 VG |
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 | { | |
450dd430 VG |
44 | arc_mem_sz = size & PAGE_MASK; |
45 | pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz)); | |
999159a5 VG |
46 | } |
47 | ||
d6579e99 NC |
48 | #ifdef CONFIG_BLK_DEV_INITRD |
49 | static int __init early_initrd(char *p) | |
50 | { | |
51 | unsigned long start, size; | |
52 | char *endp; | |
53 | ||
54 | start = memparse(p, &endp); | |
55 | if (*endp == ',') { | |
56 | size = memparse(endp + 1, NULL); | |
57 | ||
58 | initrd_start = (unsigned long)__va(start); | |
59 | initrd_end = (unsigned long)__va(start + size); | |
60 | } | |
61 | return 0; | |
62 | } | |
63 | early_param("initrd", early_initrd); | |
64 | #endif | |
65 | ||
c121c506 VG |
66 | /* |
67 | * First memory setup routine called from setup_arch() | |
68 | * 1. setup swapper's mm @init_mm | |
69 | * 2. Count the pages we have and setup bootmem allocator | |
70 | * 3. zone setup | |
71 | */ | |
72 | void __init setup_arch_memory(void) | |
73 | { | |
f2e2013f | 74 | unsigned long zones_size[MAX_NR_ZONES]; |
c121c506 VG |
75 | unsigned long end_mem = CONFIG_LINUX_LINK_BASE + arc_mem_sz; |
76 | ||
77 | init_mm.start_code = (unsigned long)_text; | |
78 | init_mm.end_code = (unsigned long)_etext; | |
79 | init_mm.end_data = (unsigned long)_edata; | |
80 | init_mm.brk = (unsigned long)_end; | |
81 | ||
82 | /* | |
83 | * We do it here, so that memory is correctly instantiated | |
450dd430 VG |
84 | * even if "mem=xxx" cmline over-ride is given and/or |
85 | * DT has memory node. Each causes an update to @arc_mem_sz | |
86 | * and we finally add memory one here | |
c121c506 VG |
87 | */ |
88 | memblock_add(CONFIG_LINUX_LINK_BASE, arc_mem_sz); | |
89 | ||
90 | /*------------- externs in mm need setting up ---------------*/ | |
91 | ||
92 | /* first page of system - kernel .vector starts here */ | |
f2e2013f | 93 | min_low_pfn = ARCH_PFN_OFFSET; |
c121c506 VG |
94 | |
95 | /* Last usable page of low mem (no HIGHMEM yet for ARC port) */ | |
96 | max_low_pfn = max_pfn = PFN_DOWN(end_mem); | |
97 | ||
de35e1b8 | 98 | max_mapnr = max_low_pfn - min_low_pfn; |
c121c506 VG |
99 | |
100 | /*------------- reserve kernel image -----------------------*/ | |
101 | memblock_reserve(CONFIG_LINUX_LINK_BASE, | |
102 | __pa(_end) - CONFIG_LINUX_LINK_BASE); | |
103 | ||
d6579e99 NC |
104 | #ifdef CONFIG_BLK_DEV_INITRD |
105 | /*------------- reserve initrd image -----------------------*/ | |
106 | if (initrd_start) | |
107 | memblock_reserve(__pa(initrd_start), initrd_end - initrd_start); | |
108 | #endif | |
109 | ||
c121c506 VG |
110 | memblock_dump_all(); |
111 | ||
112 | /*-------------- node setup --------------------------------*/ | |
113 | memset(zones_size, 0, sizeof(zones_size)); | |
f2e2013f | 114 | zones_size[ZONE_NORMAL] = max_mapnr; |
c121c506 VG |
115 | |
116 | /* | |
117 | * We can't use the helper free_area_init(zones[]) because it uses | |
118 | * PAGE_OFFSET to compute the @min_low_pfn which would be wrong | |
119 | * when our kernel doesn't start at PAGE_OFFSET, i.e. | |
120 | * PAGE_OFFSET != CONFIG_LINUX_LINK_BASE | |
121 | */ | |
122 | free_area_init_node(0, /* node-id */ | |
123 | zones_size, /* num pages per zone */ | |
124 | min_low_pfn, /* first pfn of node */ | |
125 | NULL); /* NO holes */ | |
f2e2013f VG |
126 | |
127 | high_memory = (void *)end_mem; | |
c121c506 VG |
128 | } |
129 | ||
130 | /* | |
131 | * mem_init - initializes memory | |
132 | * | |
133 | * Frees up bootmem | |
134 | * Calculates and displays memory available/used | |
135 | */ | |
136 | void __init mem_init(void) | |
137 | { | |
0c988534 | 138 | free_all_bootmem(); |
de35e1b8 | 139 | mem_init_print_info(NULL); |
c121c506 VG |
140 | } |
141 | ||
c121c506 VG |
142 | /* |
143 | * free_initmem: Free all the __init memory. | |
144 | */ | |
145 | void __init_refok free_initmem(void) | |
146 | { | |
dbe67df4 | 147 | free_initmem_default(-1); |
c121c506 VG |
148 | } |
149 | ||
150 | #ifdef CONFIG_BLK_DEV_INITRD | |
151 | void __init free_initrd_mem(unsigned long start, unsigned long end) | |
152 | { | |
dbe67df4 | 153 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
c121c506 VG |
154 | } |
155 | #endif |