562 lines
14 KiB
C
562 lines
14 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1995 Linus Torvalds
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* Copyright (C) 1995 Waldorf Electronics
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* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
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* Copyright (C) 1996 Stoned Elipot
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* Copyright (C) 1999 Silicon Graphics, Inc.
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* Copyright (C) 2000 2001, 2002 Maciej W. Rozycki
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*/
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#include <linux/config.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/stddef.h>
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#include <linux/string.h>
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#include <linux/unistd.h>
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#include <linux/slab.h>
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#include <linux/user.h>
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#include <linux/utsname.h>
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#include <linux/a.out.h>
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#include <linux/tty.h>
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#include <linux/bootmem.h>
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#include <linux/initrd.h>
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#include <linux/major.h>
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#include <linux/kdev_t.h>
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#include <linux/root_dev.h>
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#include <linux/highmem.h>
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#include <linux/console.h>
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#include <linux/mmzone.h>
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#include <asm/addrspace.h>
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#include <asm/bootinfo.h>
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#include <asm/cache.h>
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#include <asm/cpu.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/system.h>
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struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
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EXPORT_SYMBOL(cpu_data);
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#ifdef CONFIG_VT
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struct screen_info screen_info;
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#endif
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/*
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* Despite it's name this variable is even if we don't have PCI
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*/
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unsigned int PCI_DMA_BUS_IS_PHYS;
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EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
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/*
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* Setup information
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*
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* These are initialized so they are in the .data section
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*/
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unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
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unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN;
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EXPORT_SYMBOL(mips_machtype);
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EXPORT_SYMBOL(mips_machgroup);
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struct boot_mem_map boot_mem_map;
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static char command_line[CL_SIZE];
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char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
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/*
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* mips_io_port_base is the begin of the address space to which x86 style
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* I/O ports are mapped.
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*/
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const unsigned long mips_io_port_base __read_mostly = -1;
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EXPORT_SYMBOL(mips_io_port_base);
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/*
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* isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
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* for the processor.
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*/
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unsigned long isa_slot_offset;
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EXPORT_SYMBOL(isa_slot_offset);
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static struct resource code_resource = { .name = "Kernel code", };
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static struct resource data_resource = { .name = "Kernel data", };
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void __init add_memory_region(phys_t start, phys_t size, long type)
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{
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int x = boot_mem_map.nr_map;
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struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
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/*
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* Try to merge with previous entry if any. This is far less than
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* perfect but is sufficient for most real world cases.
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*/
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if (x && prev->addr + prev->size == start && prev->type == type) {
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prev->size += size;
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return;
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}
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if (x == BOOT_MEM_MAP_MAX) {
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printk("Ooops! Too many entries in the memory map!\n");
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return;
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}
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boot_mem_map.map[x].addr = start;
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boot_mem_map.map[x].size = size;
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boot_mem_map.map[x].type = type;
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boot_mem_map.nr_map++;
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}
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static void __init print_memory_map(void)
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{
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int i;
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const int field = 2 * sizeof(unsigned long);
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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printk(" memory: %0*Lx @ %0*Lx ",
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field, (unsigned long long) boot_mem_map.map[i].size,
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field, (unsigned long long) boot_mem_map.map[i].addr);
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switch (boot_mem_map.map[i].type) {
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case BOOT_MEM_RAM:
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printk("(usable)\n");
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break;
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case BOOT_MEM_ROM_DATA:
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printk("(ROM data)\n");
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break;
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case BOOT_MEM_RESERVED:
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printk("(reserved)\n");
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break;
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default:
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printk("type %lu\n", boot_mem_map.map[i].type);
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break;
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}
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}
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}
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static inline void parse_cmdline_early(void)
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{
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char c = ' ', *to = command_line, *from = saved_command_line;
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unsigned long start_at, mem_size;
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int len = 0;
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int usermem = 0;
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printk("Determined physical RAM map:\n");
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print_memory_map();
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for (;;) {
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/*
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* "mem=XXX[kKmM]" defines a memory region from
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* 0 to <XXX>, overriding the determined size.
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* "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
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* <YYY> to <YYY>+<XXX>, overriding the determined size.
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*/
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if (c == ' ' && !memcmp(from, "mem=", 4)) {
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if (to != command_line)
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to--;
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/*
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* If a user specifies memory size, we
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* blow away any automatically generated
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* size.
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*/
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if (usermem == 0) {
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boot_mem_map.nr_map = 0;
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usermem = 1;
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}
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mem_size = memparse(from + 4, &from);
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if (*from == '@')
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start_at = memparse(from + 1, &from);
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else
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start_at = 0;
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add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
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}
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c = *(from++);
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if (!c)
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break;
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if (CL_SIZE <= ++len)
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break;
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*(to++) = c;
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}
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*to = '\0';
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if (usermem) {
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printk("User-defined physical RAM map:\n");
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print_memory_map();
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}
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}
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static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end)
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{
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/*
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* "rd_start=0xNNNNNNNN" defines the memory address of an initrd
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* "rd_size=0xNN" it's size
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*/
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unsigned long start = 0;
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unsigned long size = 0;
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unsigned long end;
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char cmd_line[CL_SIZE];
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char *start_str;
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char *size_str;
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char *tmp;
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strcpy(cmd_line, command_line);
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*command_line = 0;
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tmp = cmd_line;
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/* Ignore "rd_start=" strings in other parameters. */
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start_str = strstr(cmd_line, "rd_start=");
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if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
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start_str = strstr(start_str, " rd_start=");
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while (start_str) {
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if (start_str != cmd_line)
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strncat(command_line, tmp, start_str - tmp);
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start = memparse(start_str + 9, &start_str);
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tmp = start_str + 1;
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start_str = strstr(start_str, " rd_start=");
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}
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if (*tmp)
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strcat(command_line, tmp);
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strcpy(cmd_line, command_line);
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*command_line = 0;
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tmp = cmd_line;
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/* Ignore "rd_size" strings in other parameters. */
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size_str = strstr(cmd_line, "rd_size=");
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if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
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size_str = strstr(size_str, " rd_size=");
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while (size_str) {
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if (size_str != cmd_line)
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strncat(command_line, tmp, size_str - tmp);
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size = memparse(size_str + 8, &size_str);
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tmp = size_str + 1;
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size_str = strstr(size_str, " rd_size=");
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}
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if (*tmp)
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strcat(command_line, tmp);
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#ifdef CONFIG_64BIT
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/* HACK: Guess if the sign extension was forgotten */
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if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
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start |= 0xffffffff00000000;
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#endif
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end = start + size;
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if (start && end) {
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*rd_start = start;
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*rd_end = end;
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return 1;
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}
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return 0;
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}
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#define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
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#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
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#define PFN_PHYS(x) ((x) << PAGE_SHIFT)
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#define MAXMEM HIGHMEM_START
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#define MAXMEM_PFN PFN_DOWN(MAXMEM)
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static inline void bootmem_init(void)
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{
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unsigned long start_pfn;
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unsigned long reserved_end = (unsigned long)&_end;
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#ifndef CONFIG_SGI_IP27
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unsigned long first_usable_pfn;
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unsigned long bootmap_size;
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int i;
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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int initrd_reserve_bootmem = 0;
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/* Board specific code should have set up initrd_start and initrd_end */
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ROOT_DEV = Root_RAM0;
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if (parse_rd_cmdline(&initrd_start, &initrd_end)) {
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reserved_end = max(reserved_end, initrd_end);
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initrd_reserve_bootmem = 1;
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} else {
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unsigned long tmp;
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u32 *initrd_header;
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tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2;
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if (tmp < reserved_end)
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tmp += PAGE_SIZE;
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initrd_header = (u32 *)tmp;
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if (initrd_header[0] == 0x494E5244) {
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initrd_start = (unsigned long)&initrd_header[2];
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initrd_end = initrd_start + initrd_header[1];
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reserved_end = max(reserved_end, initrd_end);
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initrd_reserve_bootmem = 1;
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}
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}
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#endif /* CONFIG_BLK_DEV_INITRD */
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/*
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* Partially used pages are not usable - thus
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* we are rounding upwards.
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*/
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start_pfn = PFN_UP(CPHYSADDR(reserved_end));
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#ifndef CONFIG_SGI_IP27
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/* Find the highest page frame number we have available. */
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max_pfn = 0;
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first_usable_pfn = -1UL;
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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unsigned long start, end;
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if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
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continue;
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start = PFN_UP(boot_mem_map.map[i].addr);
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end = PFN_DOWN(boot_mem_map.map[i].addr
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+ boot_mem_map.map[i].size);
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if (start >= end)
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continue;
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if (end > max_pfn)
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max_pfn = end;
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if (start < first_usable_pfn) {
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if (start > start_pfn) {
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first_usable_pfn = start;
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} else if (end > start_pfn) {
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first_usable_pfn = start_pfn;
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}
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}
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}
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/*
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* Determine low and high memory ranges
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*/
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max_low_pfn = max_pfn;
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if (max_low_pfn > MAXMEM_PFN) {
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max_low_pfn = MAXMEM_PFN;
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#ifndef CONFIG_HIGHMEM
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/* Maximum memory usable is what is directly addressable */
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printk(KERN_WARNING "Warning only %ldMB will be used.\n",
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MAXMEM >> 20);
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printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
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#endif
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}
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#ifdef CONFIG_HIGHMEM
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/*
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* Crude, we really should make a better attempt at detecting
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* highstart_pfn
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*/
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highstart_pfn = highend_pfn = max_pfn;
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if (max_pfn > MAXMEM_PFN) {
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highstart_pfn = MAXMEM_PFN;
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printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
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(highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
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}
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#endif
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memory_present(0, first_usable_pfn, max_low_pfn);
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/* Initialize the boot-time allocator with low memory only. */
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bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
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/*
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* Register fully available low RAM pages with the bootmem allocator.
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*/
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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unsigned long curr_pfn, last_pfn, size;
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/*
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* Reserve usable memory.
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*/
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if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
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continue;
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/*
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* We are rounding up the start address of usable memory:
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*/
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curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
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if (curr_pfn >= max_low_pfn)
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continue;
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if (curr_pfn < start_pfn)
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curr_pfn = start_pfn;
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/*
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* ... and at the end of the usable range downwards:
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*/
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last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
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+ boot_mem_map.map[i].size);
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if (last_pfn > max_low_pfn)
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last_pfn = max_low_pfn;
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/*
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* Only register lowmem part of lowmem segment with bootmem.
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*/
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size = last_pfn - curr_pfn;
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if (curr_pfn > PFN_DOWN(HIGHMEM_START))
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continue;
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if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
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size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
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if (!size)
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continue;
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/*
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* ... finally, did all the rounding and playing
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* around just make the area go away?
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*/
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if (last_pfn <= curr_pfn)
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continue;
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/* Register lowmem ranges */
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free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
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}
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/* Reserve the bootmap memory. */
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reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
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#endif /* CONFIG_SGI_IP27 */
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#ifdef CONFIG_BLK_DEV_INITRD
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initrd_below_start_ok = 1;
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if (initrd_start) {
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unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
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printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
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(void *)initrd_start, initrd_size);
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if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
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printk("initrd extends beyond end of memory "
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"(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
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sizeof(long) * 2,
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(unsigned long long)CPHYSADDR(initrd_end),
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sizeof(long) * 2,
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(unsigned long long)PFN_PHYS(max_low_pfn));
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initrd_start = initrd_end = 0;
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initrd_reserve_bootmem = 0;
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}
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if (initrd_reserve_bootmem)
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reserve_bootmem(CPHYSADDR(initrd_start), initrd_size);
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}
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#endif /* CONFIG_BLK_DEV_INITRD */
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}
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static inline void resource_init(void)
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{
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int i;
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#if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
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/*
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* The 64bit code in 32bit object format trick can't represent
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* 64bit wide relocations for linker script symbols.
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*/
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code_resource.start = CPHYSADDR(&_text);
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code_resource.end = CPHYSADDR(&_etext) - 1;
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data_resource.start = CPHYSADDR(&_etext);
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data_resource.end = CPHYSADDR(&_edata) - 1;
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#else
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code_resource.start = virt_to_phys(&_text);
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code_resource.end = virt_to_phys(&_etext) - 1;
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data_resource.start = virt_to_phys(&_etext);
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data_resource.end = virt_to_phys(&_edata) - 1;
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#endif
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/*
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* Request address space for all standard RAM.
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*/
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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struct resource *res;
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unsigned long start, end;
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start = boot_mem_map.map[i].addr;
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end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
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if (start >= MAXMEM)
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continue;
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if (end >= MAXMEM)
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end = MAXMEM - 1;
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res = alloc_bootmem(sizeof(struct resource));
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switch (boot_mem_map.map[i].type) {
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case BOOT_MEM_RAM:
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case BOOT_MEM_ROM_DATA:
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res->name = "System RAM";
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break;
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case BOOT_MEM_RESERVED:
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default:
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res->name = "reserved";
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}
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res->start = start;
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res->end = end;
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res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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request_resource(&iomem_resource, res);
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/*
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* We don't know which RAM region contains kernel data,
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* so we try it repeatedly and let the resource manager
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* test it.
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*/
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request_resource(res, &code_resource);
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request_resource(res, &data_resource);
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}
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}
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#undef PFN_UP
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#undef PFN_DOWN
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#undef PFN_PHYS
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#undef MAXMEM
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#undef MAXMEM_PFN
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extern void plat_setup(void);
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void __init setup_arch(char **cmdline_p)
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{
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cpu_probe();
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prom_init();
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cpu_report();
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#if defined(CONFIG_VT)
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#if defined(CONFIG_VGA_CONSOLE)
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conswitchp = &vga_con;
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#elif defined(CONFIG_DUMMY_CONSOLE)
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conswitchp = &dummy_con;
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#endif
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#endif
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/* call board setup routine */
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plat_setup();
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strlcpy(command_line, arcs_cmdline, sizeof(command_line));
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strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
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*cmdline_p = command_line;
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parse_cmdline_early();
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bootmem_init();
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sparse_init();
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paging_init();
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resource_init();
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}
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int __init fpu_disable(char *s)
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{
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cpu_data[0].options &= ~MIPS_CPU_FPU;
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return 1;
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}
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__setup("nofpu", fpu_disable);
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int __init dsp_disable(char *s)
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{
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cpu_data[0].ases &= ~MIPS_ASE_DSP;
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return 1;
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}
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__setup("nodsp", dsp_disable);
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