179 lines
4.3 KiB
C
179 lines
4.3 KiB
C
/*
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* Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* PROM library functions for acquiring/using memory descriptors given to
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* us from the YAMON.
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/pfn.h>
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#include <linux/string.h>
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#include <asm/bootinfo.h>
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#include <asm/page.h>
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#include <asm/sections.h>
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#include <asm/mips-boards/prom.h>
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/*#define DEBUG*/
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enum yamon_memtypes {
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yamon_dontuse,
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yamon_prom,
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yamon_free,
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};
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static struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
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#ifdef DEBUG
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static char *mtypes[3] = {
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"Dont use memory",
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"YAMON PROM memory",
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"Free memmory",
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};
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#endif
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/* determined physical memory size, not overridden by command line args */
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unsigned long physical_memsize = 0L;
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static struct prom_pmemblock * __init prom_getmdesc(void)
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{
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char *memsize_str;
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unsigned int memsize;
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char *ptr;
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static char cmdline[COMMAND_LINE_SIZE] __initdata;
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/* otherwise look in the environment */
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memsize_str = prom_getenv("memsize");
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if (!memsize_str) {
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printk(KERN_WARNING
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"memsize not set in boot prom, set to default (32Mb)\n");
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physical_memsize = 0x02000000;
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} else {
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#ifdef DEBUG
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pr_debug("prom_memsize = %s\n", memsize_str);
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#endif
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physical_memsize = simple_strtol(memsize_str, NULL, 0);
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}
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#ifdef CONFIG_CPU_BIG_ENDIAN
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/* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last
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word of physical memory */
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physical_memsize -= PAGE_SIZE;
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#endif
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/* Check the command line for a memsize directive that overrides
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the physical/default amount */
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strcpy(cmdline, arcs_cmdline);
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ptr = strstr(cmdline, "memsize=");
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if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
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ptr = strstr(ptr, " memsize=");
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if (ptr)
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memsize = memparse(ptr + 8, &ptr);
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else
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memsize = physical_memsize;
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memset(mdesc, 0, sizeof(mdesc));
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mdesc[0].type = yamon_dontuse;
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mdesc[0].base = 0x00000000;
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mdesc[0].size = 0x00001000;
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mdesc[1].type = yamon_prom;
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mdesc[1].base = 0x00001000;
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mdesc[1].size = 0x000ef000;
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/*
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* The area 0x000f0000-0x000fffff is allocated for BIOS memory by the
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* south bridge and PCI access always forwarded to the ISA Bus and
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* BIOSCS# is always generated.
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* This mean that this area can't be used as DMA memory for PCI
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* devices.
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*/
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mdesc[2].type = yamon_dontuse;
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mdesc[2].base = 0x000f0000;
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mdesc[2].size = 0x00010000;
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mdesc[3].type = yamon_dontuse;
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mdesc[3].base = 0x00100000;
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mdesc[3].size = CPHYSADDR(PFN_ALIGN((unsigned long)&_end)) - mdesc[3].base;
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mdesc[4].type = yamon_free;
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mdesc[4].base = CPHYSADDR(PFN_ALIGN(&_end));
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mdesc[4].size = memsize - mdesc[4].base;
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return &mdesc[0];
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}
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static int __init prom_memtype_classify(unsigned int type)
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{
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switch (type) {
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case yamon_free:
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return BOOT_MEM_RAM;
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case yamon_prom:
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return BOOT_MEM_ROM_DATA;
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default:
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return BOOT_MEM_RESERVED;
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}
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}
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void __init prom_meminit(void)
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{
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struct prom_pmemblock *p;
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#ifdef DEBUG
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pr_debug("YAMON MEMORY DESCRIPTOR dump:\n");
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p = prom_getmdesc();
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while (p->size) {
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int i = 0;
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pr_debug("[%d,%p]: base<%08lx> size<%08lx> type<%s>\n",
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i, p, p->base, p->size, mtypes[p->type]);
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p++;
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i++;
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}
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#endif
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p = prom_getmdesc();
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while (p->size) {
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long type;
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unsigned long base, size;
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type = prom_memtype_classify(p->type);
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base = p->base;
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size = p->size;
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add_memory_region(base, size, type);
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p++;
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}
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}
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void __init prom_free_prom_memory(void)
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{
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unsigned long addr;
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int i;
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
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continue;
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addr = boot_mem_map.map[i].addr;
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free_init_pages("prom memory",
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addr, addr + boot_mem_map.map[i].size);
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}
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}
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