2 * Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
5 * This program is free software; you can distribute it and/or modify it
6 * under the terms of the GNU General Public License (Version 2) as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
18 * PROM library functions for acquiring/using memory descriptors given to
21 #include <linux/init.h>
23 #include <linux/bootmem.h>
24 #include <linux/pfn.h>
25 #include <linux/string.h>
27 #include <asm/bootinfo.h>
29 #include <asm/sections.h>
30 #include <asm/fw/fw.h>
32 #include <asm/mips-boards/prom.h>
34 static fw_memblock_t mdesc[FW_MAX_MEMBLOCKS];
36 /* determined physical memory size, not overridden by command line args */
37 unsigned long physical_memsize = 0L;
39 fw_memblock_t * __init fw_getmdesc(void)
44 static char cmdline[COMMAND_LINE_SIZE] __initdata;
46 /* otherwise look in the environment */
47 memsize_str = fw_getenv("memsize");
50 "memsize not set in boot prom, set to default (32Mb)\n");
51 physical_memsize = 0x02000000;
53 physical_memsize = simple_strtol(memsize_str, NULL, 0);
56 #ifdef CONFIG_CPU_BIG_ENDIAN
57 /* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last
58 word of physical memory */
59 physical_memsize -= PAGE_SIZE;
62 /* Check the command line for a memsize directive that overrides
63 the physical/default amount */
64 strcpy(cmdline, arcs_cmdline);
65 ptr = strstr(cmdline, "memsize=");
66 if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
67 ptr = strstr(ptr, " memsize=");
70 memsize = memparse(ptr + 8, &ptr);
72 memsize = physical_memsize;
74 memset(mdesc, 0, sizeof(mdesc));
76 mdesc[0].type = fw_dontuse;
77 mdesc[0].base = 0x00000000;
78 mdesc[0].size = 0x00001000;
80 mdesc[1].type = fw_code;
81 mdesc[1].base = 0x00001000;
82 mdesc[1].size = 0x000ef000;
85 * The area 0x000f0000-0x000fffff is allocated for BIOS memory by the
86 * south bridge and PCI access always forwarded to the ISA Bus and
87 * BIOSCS# is always generated.
88 * This mean that this area can't be used as DMA memory for PCI
91 mdesc[2].type = fw_dontuse;
92 mdesc[2].base = 0x000f0000;
93 mdesc[2].size = 0x00010000;
95 mdesc[3].type = fw_dontuse;
96 mdesc[3].base = 0x00100000;
97 mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) - mdesc[3].base;
99 mdesc[4].type = fw_free;
100 mdesc[4].base = CPHYSADDR(PFN_ALIGN(&_end));
101 mdesc[4].size = memsize - mdesc[4].base;
106 static int __init fw_memtype_classify(unsigned int type)
112 return BOOT_MEM_ROM_DATA;
114 return BOOT_MEM_RESERVED;
118 void __init fw_meminit(void)
126 unsigned long base, size;
128 type = fw_memtype_classify(p->type);
132 add_memory_region(base, size, type);
137 void __init prom_free_prom_memory(void)
142 for (i = 0; i < boot_mem_map.nr_map; i++) {
143 if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
146 addr = boot_mem_map.map[i].addr;
147 free_init_pages("prom memory",
148 addr, addr + boot_mem_map.map[i].size);