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b6f1f0dea1
This function although doing simple thing is hard to follow. It's mainly due to: - a lot of #ifdef - bad local names - redundant tests So this patch try to address these issues. It also do not use max_pfn global which is marked as an unused exported symbol. As a bonus side, it's now really easy to see what part of the code is for no-numa system. There's also no point to make this function inline. Signed-off-by: Franck Bui-Huu <vagabon.xyz@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
563 lines
13 KiB
C
563 lines
13 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/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/screen_info.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 <linux/pfn.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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/* Sanity check */
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if (start + size < start) {
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printk("Trying to add an invalid memory region, skipped\n");
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return;
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}
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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 |= 0xffffffff00000000UL;
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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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/*
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* Initialize the bootmem allocator. It also setup initrd related data
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* if needed.
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*/
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static void __init bootmem_init(void)
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{
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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 highest = 0;
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unsigned long mapstart = -1UL;
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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 = PAGE_ALIGN(reserved_end) - 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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#ifndef CONFIG_SGI_IP27
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/*
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* reserved_end is now a pfn
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*/
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reserved_end = PFN_UP(CPHYSADDR(reserved_end));
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/*
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* Find the highest page frame number we have available.
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*/
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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 (end > highest)
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highest = end;
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if (end <= reserved_end)
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continue;
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if (start >= mapstart)
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continue;
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mapstart = max(reserved_end, start);
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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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if (highest > PFN_DOWN(HIGHMEM_START)) {
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#ifdef CONFIG_HIGHMEM
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highstart_pfn = PFN_DOWN(HIGHMEM_START);
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highend_pfn = highest;
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#endif
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highest = PFN_DOWN(HIGHMEM_START);
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}
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/*
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* Initialize the boot-time allocator with low memory only.
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*/
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bootmap_size = init_bootmem(mapstart, highest);
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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 start, end, 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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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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/*
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* We are rounding up the start address of usable memory
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* and at the end of the usable range downwards.
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*/
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if (start >= max_low_pfn)
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continue;
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if (start < reserved_end)
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start = reserved_end;
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if (end > max_low_pfn)
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end = max_low_pfn;
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/*
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* ... finally, is the area going away?
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*/
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if (end <= start)
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continue;
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size = end - start;
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/* Register lowmem ranges */
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free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
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memory_present(0, start, end);
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}
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/*
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* Reserve the bootmap memory.
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*/
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reserve_bootmem(PFN_PHYS(mapstart), 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) -
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((unsigned char *)initrd_start);
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const int width = sizeof(long) * 2;
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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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width,
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(unsigned long long) CPHYSADDR(initrd_end),
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width,
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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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/*
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* arch_mem_init - initialize memory managment subsystem
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*
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* o plat_mem_setup() detects the memory configuration and will record detected
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* memory areas using add_memory_region.
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* o parse_cmdline_early() parses the command line for mem= options which,
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* iff detected, will override the results of the automatic detection.
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*
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* At this stage the memory configuration of the system is known to the
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* kernel but generic memory managment system is still entirely uninitialized.
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*
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* o bootmem_init()
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* o sparse_init()
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* o paging_init()
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*
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* At this stage the bootmem allocator is ready to use.
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*
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* NOTE: historically plat_mem_setup did the entire platform initialization.
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* This was rather impractical because it meant plat_mem_setup had to
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* get away without any kind of memory allocator. To keep old code from
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* breaking plat_setup was just renamed to plat_setup and a second platform
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* initialization hook for anything else was introduced.
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*/
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extern void plat_mem_setup(void);
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static void __init arch_mem_init(char **cmdline_p)
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{
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/* call board setup routine */
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plat_mem_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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}
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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 resource_init(void)
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{
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int i;
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if (UNCAC_BASE != IO_BASE)
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return;
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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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/*
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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);
|
|
request_resource(res, &data_resource);
|
|
}
|
|
}
|
|
|
|
#undef MAXMEM
|
|
#undef MAXMEM_PFN
|
|
|
|
void __init setup_arch(char **cmdline_p)
|
|
{
|
|
cpu_probe();
|
|
prom_init();
|
|
cpu_report();
|
|
|
|
#if defined(CONFIG_VT)
|
|
#if defined(CONFIG_VGA_CONSOLE)
|
|
conswitchp = &vga_con;
|
|
#elif defined(CONFIG_DUMMY_CONSOLE)
|
|
conswitchp = &dummy_con;
|
|
#endif
|
|
#endif
|
|
|
|
arch_mem_init(cmdline_p);
|
|
|
|
resource_init();
|
|
#ifdef CONFIG_SMP
|
|
plat_smp_setup();
|
|
#endif
|
|
}
|
|
|
|
int __init fpu_disable(char *s)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NR_CPUS; i++)
|
|
cpu_data[i].options &= ~MIPS_CPU_FPU;
|
|
|
|
return 1;
|
|
}
|
|
|
|
__setup("nofpu", fpu_disable);
|
|
|
|
int __init dsp_disable(char *s)
|
|
{
|
|
cpu_data[0].ases &= ~MIPS_ASE_DSP;
|
|
|
|
return 1;
|
|
}
|
|
|
|
__setup("nodsp", dsp_disable);
|