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Vineet Guptac121c502013-01-18 15:12:20 +05301/*
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>
Noam Camusd6579e92012-09-09 11:37:40 +030013#ifdef CONFIG_BLK_DEV_INITRD
14#include <linux/initrd.h>
15#endif
Vineet Guptac121c502013-01-18 15:12:20 +053016#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
23pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
24char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
25EXPORT_SYMBOL(empty_zero_page);
26
27/* Default tot mem from .config */
Vineet Gupta450dd432013-01-18 15:12:20 +053028static unsigned long arc_mem_sz = 0x20000000; /* some default */
Vineet Guptac121c502013-01-18 15:12:20 +053029
30/* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
31static 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}
40early_param("mem", setup_mem_sz);
41
Vineet Gupta999159a2013-01-22 17:00:52 +053042void __init early_init_dt_add_memory_arch(u64 base, u64 size)
43{
Vineet Gupta450dd432013-01-18 15:12:20 +053044 arc_mem_sz = size & PAGE_MASK;
45 pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz));
Vineet Gupta999159a2013-01-22 17:00:52 +053046}
47
Noam Camusd6579e92012-09-09 11:37:40 +030048#ifdef CONFIG_BLK_DEV_INITRD
49static 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}
63early_param("initrd", early_initrd);
64#endif
65
Vineet Guptac121c502013-01-18 15:12:20 +053066/*
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 */
72void __init setup_arch_memory(void)
73{
Vineet Guptaf2e2013f72015-02-13 13:59:53 +053074 unsigned long zones_size[MAX_NR_ZONES];
Vineet Guptac121c502013-01-18 15:12:20 +053075 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
Vineet Gupta450dd432013-01-18 15:12:20 +053084 * 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
Vineet Guptac121c502013-01-18 15:12:20 +053087 */
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 */
Vineet Guptaf2e2013f72015-02-13 13:59:53 +053093 min_low_pfn = ARCH_PFN_OFFSET;
Vineet Guptac121c502013-01-18 15:12:20 +053094
95 /* Last usable page of low mem (no HIGHMEM yet for ARC port) */
96 max_low_pfn = max_pfn = PFN_DOWN(end_mem);
97
Jiang Liude35e1b2013-07-03 15:03:47 -070098 max_mapnr = max_low_pfn - min_low_pfn;
Vineet Guptac121c502013-01-18 15:12:20 +053099
100 /*------------- reserve kernel image -----------------------*/
101 memblock_reserve(CONFIG_LINUX_LINK_BASE,
102 __pa(_end) - CONFIG_LINUX_LINK_BASE);
103
Noam Camusd6579e92012-09-09 11:37:40 +0300104#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
Vineet Guptac121c502013-01-18 15:12:20 +0530110 memblock_dump_all();
111
112 /*-------------- node setup --------------------------------*/
113 memset(zones_size, 0, sizeof(zones_size));
Vineet Guptaf2e2013f72015-02-13 13:59:53 +0530114 zones_size[ZONE_NORMAL] = max_mapnr;
Vineet Guptac121c502013-01-18 15:12:20 +0530115
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 */
Vineet Guptaf2e2013f72015-02-13 13:59:53 +0530126
127 high_memory = (void *)end_mem;
Vineet Guptac121c502013-01-18 15:12:20 +0530128}
129
130/*
131 * mem_init - initializes memory
132 *
133 * Frees up bootmem
134 * Calculates and displays memory available/used
135 */
136void __init mem_init(void)
137{
Jiang Liu0c988532013-07-03 15:03:24 -0700138 free_all_bootmem();
Jiang Liude35e1b2013-07-03 15:03:47 -0700139 mem_init_print_info(NULL);
Vineet Guptac121c502013-01-18 15:12:20 +0530140}
141
Vineet Guptac121c502013-01-18 15:12:20 +0530142/*
143 * free_initmem: Free all the __init memory.
144 */
145void __init_refok free_initmem(void)
146{
Jiang Liudbe67df2013-07-03 15:02:51 -0700147 free_initmem_default(-1);
Vineet Guptac121c502013-01-18 15:12:20 +0530148}
149
150#ifdef CONFIG_BLK_DEV_INITRD
151void __init free_initrd_mem(unsigned long start, unsigned long end)
152{
Jiang Liudbe67df2013-07-03 15:02:51 -0700153 free_reserved_area((void *)start, (void *)end, -1, "initrd");
Vineet Guptac121c502013-01-18 15:12:20 +0530154}
155#endif