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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - arch/arc/mm/init.c
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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.
9 #include <linux/kernel.h>
11 #include <linux/bootmem.h>
12 #include <linux/memblock.h>
13 #ifdef CONFIG_BLOCK_DEV_RAM
14 #include <linux/blk.h>
16 #include <linux/swap.h>
17 #include <linux/module.h>
19 #include <asm/pgalloc.h>
20 #include <asm/sections.h>
21 #include <asm/arcregs.h>
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
);
27 /* Default tot mem from .config */
28 static unsigned long arc_mem_sz
= 0x20000000; /* some default */
30 /* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
31 static int __init
setup_mem_sz(char *str
)
33 arc_mem_sz
= memparse(str
, NULL
) & PAGE_MASK
;
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
));
40 early_param("mem", setup_mem_sz
);
42 void __init
early_init_dt_add_memory_arch(u64 base
, u64 size
)
44 arc_mem_sz
= size
& PAGE_MASK
;
45 pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz
));
49 * First memory setup routine called from setup_arch()
50 * 1. setup swapper's mm @init_mm
51 * 2. Count the pages we have and setup bootmem allocator
54 void __init
setup_arch_memory(void)
56 unsigned long zones_size
[MAX_NR_ZONES
] = { 0, 0 };
57 unsigned long end_mem
= CONFIG_LINUX_LINK_BASE
+ arc_mem_sz
;
59 init_mm
.start_code
= (unsigned long)_text
;
60 init_mm
.end_code
= (unsigned long)_etext
;
61 init_mm
.end_data
= (unsigned long)_edata
;
62 init_mm
.brk
= (unsigned long)_end
;
65 * We do it here, so that memory is correctly instantiated
66 * even if "mem=xxx" cmline over-ride is given and/or
67 * DT has memory node. Each causes an update to @arc_mem_sz
68 * and we finally add memory one here
70 memblock_add(CONFIG_LINUX_LINK_BASE
, arc_mem_sz
);
72 /*------------- externs in mm need setting up ---------------*/
74 /* first page of system - kernel .vector starts here */
75 min_low_pfn
= PFN_DOWN(CONFIG_LINUX_LINK_BASE
);
77 /* Last usable page of low mem (no HIGHMEM yet for ARC port) */
78 max_low_pfn
= max_pfn
= PFN_DOWN(end_mem
);
80 max_mapnr
= num_physpages
= max_low_pfn
- min_low_pfn
;
82 /*------------- reserve kernel image -----------------------*/
83 memblock_reserve(CONFIG_LINUX_LINK_BASE
,
84 __pa(_end
) - CONFIG_LINUX_LINK_BASE
);
88 /*-------------- node setup --------------------------------*/
89 memset(zones_size
, 0, sizeof(zones_size
));
90 zones_size
[ZONE_NORMAL
] = num_physpages
;
93 * We can't use the helper free_area_init(zones[]) because it uses
94 * PAGE_OFFSET to compute the @min_low_pfn which would be wrong
95 * when our kernel doesn't start at PAGE_OFFSET, i.e.
96 * PAGE_OFFSET != CONFIG_LINUX_LINK_BASE
98 free_area_init_node(0, /* node-id */
99 zones_size
, /* num pages per zone */
100 min_low_pfn
, /* first pfn of node */
101 NULL
); /* NO holes */
105 * mem_init - initializes memory
108 * Calculates and displays memory available/used
110 void __init
mem_init(void)
112 int codesize
, datasize
, initsize
, reserved_pages
, free_pages
;
115 high_memory
= (void *)(CONFIG_LINUX_LINK_BASE
+ arc_mem_sz
);
117 totalram_pages
= free_all_bootmem();
119 /* count all reserved pages [kernel code/data/mem_map..] */
121 for (tmp
= 0; tmp
< max_mapnr
; tmp
++)
122 if (PageReserved(mem_map
+ tmp
))
125 /* XXX: nr_free_pages() is equivalent */
126 free_pages
= max_mapnr
- reserved_pages
;
129 * For the purpose of display below, split the "reserve mem"
130 * kernel code/data is already shown explicitly,
131 * Show any other reservations (mem_map[ ] et al)
133 reserved_pages
-= (((unsigned int)_end
- CONFIG_LINUX_LINK_BASE
) >>
136 codesize
= _etext
- _text
;
137 datasize
= _end
- _etext
;
138 initsize
= __init_end
- __init_begin
;
140 pr_info("Memory Available: %dM / %ldM (%dK code, %dK data, %dK init, %dK reserv)\n",
141 PAGES_TO_MB(free_pages
),
143 TO_KB(codesize
), TO_KB(datasize
), TO_KB(initsize
),
144 PAGES_TO_KB(reserved_pages
));
148 * free_initmem: Free all the __init memory.
150 void __init_refok
free_initmem(void)
152 free_initmem_default(0);
155 #ifdef CONFIG_BLK_DEV_INITRD
156 void __init
free_initrd_mem(unsigned long start
, unsigned long end
)
158 free_reserved_area(start
, end
, 0, "initrd");
162 #ifdef CONFIG_OF_FLATTREE
163 void __init
early_init_dt_setup_initrd_arch(unsigned long start
,
166 pr_err("%s(%lx, %lx)\n", __func__
, start
, end
);
168 #endif /* CONFIG_OF_FLATTREE */