4 * Copyright (C) 2007 OpenWrt.org
6 * Based on arch/mips/mm/init.c
7 * Copyright (C) 1994 - 2000 Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
10 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
26 #include <linux/bootmem.h>
27 #include <linux/init.h>
29 #include <linux/module.h>
30 #include <linux/pfn.h>
31 #include <linux/proc_fs.h>
32 #include <linux/string.h>
33 #include <linux/swap.h>
35 #include <asm/bootinfo.h>
37 #include <asm/sections.h>
39 #include <asm/mips-boards/prom.h>
41 #warning FIXME: use sdram control regs and/or autodetection
42 static int __init
memsize(void)
46 char cmdline
[CL_SIZE
], *ptr
;
48 /* Check the command line first for a memsize directive */
49 strcpy(cmdline
, arcs_cmdline
);
50 ptr
= strstr(cmdline
, "memsize=");
51 if (ptr
&& (ptr
!= cmdline
) && (*(ptr
- 1) != ' '))
52 ptr
= strstr(ptr
, " memsize=");
55 result
= memparse(ptr
+ 8, &ptr
);
57 /* otherwise look in the environment */
58 memsize_str
= prom_getenv("memsize");
60 prom_printf("memsize not set in boot prom, set to default (8Mb)\n");
63 result
= simple_strtol(memsize_str
, NULL
, 0);
70 #ifdef CONFIG_NEED_MULTIPLE_NODES
71 static bootmem_data_t node_bootmem_data
;
72 pg_data_t __node_data
[1] = {
74 .bdata
= &node_bootmem_data
77 EXPORT_SYMBOL(__node_data
);
79 unsigned long max_mapnr
;
81 EXPORT_SYMBOL(max_mapnr
);
82 EXPORT_SYMBOL(mem_map
);
84 static unsigned long setup_zero_pages(void)
86 unsigned int order
= 3;
90 empty_zero_page
= __get_free_pages(GFP_KERNEL
| __GFP_ZERO
, order
);
92 panic("Oh boy, that early out of memory?");
94 page
= virt_to_page(empty_zero_page
);
95 split_page(page
, order
);
96 while (page
< virt_to_page(empty_zero_page
+ (PAGE_SIZE
<< order
))) {
97 SetPageReserved(page
);
101 size
= PAGE_SIZE
<< order
;
102 zero_page_mask
= (size
- 1) & PAGE_MASK
;
107 extern void pagetable_init(void);
109 void __init
paging_init(void)
111 unsigned long zones_size
[MAX_NR_ZONES
] = { 0, };
115 zones_size
[ZONE_DMA
] = max_low_pfn
- min_low_pfn
;
117 free_area_init_node(0, NODE_DATA(0), zones_size
, ARCH_PFN_OFFSET
, NULL
);
120 static struct kcore_list kcore_mem
, kcore_vmalloc
;
122 void __init
mem_init(void)
124 unsigned long codesize
, reservedpages
, datasize
, initsize
;
125 unsigned long tmp
, ram
;
126 unsigned long kernel_start
, kernel_end
;
128 kernel_start
= PFN_DOWN(CPHYSADDR((unsigned long)&_text
));
129 kernel_end
= PFN_UP(CPHYSADDR((unsigned long)&_end
));
130 for (tmp
= min_low_pfn
+ 1; tmp
< kernel_start
; tmp
++) {
131 ClearPageReserved(pfn_to_page(tmp
));
132 init_page_count(pfn_to_page(tmp
));
133 free_page((unsigned long)__va(tmp
<< PAGE_SHIFT
));
136 totalram_pages
+= free_all_bootmem();
137 totalram_pages
-= setup_zero_pages(); /* Setup zeroed pages. */
139 reservedpages
= ram
= 0;
140 for (tmp
= min_low_pfn
; tmp
<= max_low_pfn
; tmp
++) {
142 if (PageReserved(pfn_to_page(tmp
)))
143 if ((tmp
< kernel_start
) || (tmp
> kernel_end
))
148 codesize
= (unsigned long) &_etext
- (unsigned long) &_text
;
149 datasize
= (unsigned long) &_edata
- (unsigned long) &_etext
;
150 initsize
= (unsigned long) &__init_end
- (unsigned long) &__init_begin
;
152 kclist_add(&kcore_mem
, __va(min_low_pfn
),
153 (max_low_pfn
- min_low_pfn
) << PAGE_SHIFT
);
154 kclist_add(&kcore_vmalloc
, (void *)VMALLOC_START
,
155 VMALLOC_END
- VMALLOC_START
);
157 printk(KERN_INFO
"Memory: %luk/%luk available (%ldk kernel code, "
158 "%ldk reserved, %ldk data, %ldk init)\n",
159 (unsigned long) nr_free_pages() << (PAGE_SHIFT
-10),
160 ram
<< (PAGE_SHIFT
-10),
162 reservedpages
<< (PAGE_SHIFT
-10),
168 void __init
prom_meminit(void)
170 #ifdef CONFIG_NEED_MULTIPLE_NODES
171 unsigned long kernel_start
, kernel_end
;
172 unsigned long pages
, free_pages
;
173 unsigned long bootmap_size
;
176 pages
= memsize() >> PAGE_SHIFT
;
177 add_memory_region(ARCH_PFN_OFFSET
<< PAGE_SHIFT
, pages
<<
178 PAGE_SHIFT
, BOOT_MEM_RAM
);
180 #ifdef CONFIG_NEED_MULTIPLE_NODES
181 kernel_start
= PFN_DOWN(CPHYSADDR((unsigned long)&_text
));
182 kernel_end
= PFN_UP(CPHYSADDR((unsigned long)&_end
));
183 min_low_pfn
= ARCH_PFN_OFFSET
;
184 max_low_pfn
= ARCH_PFN_OFFSET
+ pages
;
185 max_mapnr
= max_low_pfn
;
186 free_pages
= pages
- (kernel_end
- min_low_pfn
);
187 bootmap_size
= init_bootmem_node(NODE_DATA(0), kernel_end
,
188 ARCH_PFN_OFFSET
, max_low_pfn
);
190 free_bootmem(PFN_PHYS(kernel_end
), free_pages
<< PAGE_SHIFT
);
191 memory_present(0, min_low_pfn
, max_low_pfn
);
192 reserve_bootmem(PFN_PHYS(kernel_end
), bootmap_size
);
193 mem_map
= NODE_DATA(0)->node_mem_map
;
197 unsigned long __init
prom_free_prom_memory(void)