path: root/arch/mips/kernel/setup.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1995 Linus Torvalds
 * Copyright (C) 1995 Waldorf Electronics
 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03  Ralf Baechle
 * Copyright (C) 1996 Stoned Elipot
 * Copyright (C) 1999 Silicon Graphics, Inc.
 * Copyright (C) 2000, 2001, 2002, 2007	 Maciej W. Rozycki
 */
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/export.h>
#include <linux/screen_info.h>
#include <linux/memblock.h>
#include <linux/bootmem.h>
#include <linux/initrd.h>
#include <linux/root_dev.h>
#include <linux/highmem.h>
#include <linux/console.h>
#include <linux/pfn.h>
#include <linux/debugfs.h>
#include <linux/kexec.h>
#include <linux/sizes.h>
#include <linux/device.h>
#include <linux/dma-contiguous.h>
#include <linux/decompress/generic.h>
#include <linux/of_fdt.h>

#include <asm/addrspace.h>
#include <asm/bootinfo.h>
#include <asm/bugs.h>
#include <asm/cache.h>
#include <asm/cdmm.h>
#include <asm/cpu.h>
#include <asm/debug.h>
#include <asm/dma-coherence.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/smp-ops.h>
#include <asm/prom.h>

#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
const char __section(.appended_dtb) __appended_dtb[0x100000];
#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */

struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;

EXPORT_SYMBOL(cpu_data);

#ifdef CONFIG_VT
struct screen_info screen_info;
#endif

/*
 * Setup information
 *
 * These are initialized so they are in the .data section
 */
unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;

EXPORT_SYMBOL(mips_machtype);

struct boot_mem_map boot_mem_map;

static char __initdata command_line[COMMAND_LINE_SIZE];
char __initdata arcs_cmdline[COMMAND_LINE_SIZE];

#ifdef CONFIG_CMDLINE_BOOL
static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
#endif

/*
 * mips_io_port_base is the begin of the address space to which x86 style
 * I/O ports are mapped.
 */
const unsigned long mips_io_port_base = -1;
EXPORT_SYMBOL(mips_io_port_base);

static struct resource code_resource = { .name = "Kernel code", };
static struct resource data_resource = { .name = "Kernel data", };
static struct resource bss_resource = { .name = "Kernel bss", };

static void *detect_magic __initdata = detect_memory_region;

#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
unsigned long ARCH_PFN_OFFSET;
EXPORT_SYMBOL(ARCH_PFN_OFFSET);
#endif

void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
{
	int x = boot_mem_map.nr_map;
	int i;

	/*
	 * If the region reaches the top of the physical address space, adjust
	 * the size slightly so that (start + size) doesn't overflow
	 */
	if (start + size - 1 == PHYS_ADDR_MAX)
		--size;

	/* Sanity check */
	if (start + size < start) {
		pr_warn("Trying to add an invalid memory region, skipped\n");
		return;
	}

	/*
	 * Try to merge with existing entry, if any.
	 */
	for (i = 0; i < boot_mem_map.nr_map; i++) {
		struct boot_mem_map_entry *entry = boot_mem_map.map + i;
		unsigned long top;

		if (entry->type != type)
			continue;

		if (start + size < entry->addr)
			continue;			/* no overlap */

		if (entry->addr + entry->size < start)
			continue;			/* no overlap */

		top = max(entry->addr + entry->size, start + size);
		entry->addr = min(entry->addr, start);
		entry->size = top - entry->addr;

		return;
	}

	if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
		pr_err("Ooops! Too many entries in the memory map!\n");
		return;
	}

	boot_mem_map.map[x].addr = start;
	boot_mem_map.map[x].size = size;
	boot_mem_map.map[x].type = type;
	boot_mem_map.nr_map++;
}

void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
{
	void *dm = &detect_magic;
	phys_addr_t size;

	for (size = sz_min; size < sz_max; size <<= 1) {
		if (!memcmp(dm, dm + size, sizeof(detect_magic)))
			break;
	}

	pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
		((unsigned long long) size) / SZ_1M,
		(unsigned long long) start,
		((unsigned long long) sz_min) / SZ_1M,
		((unsigned long long) sz_max) / SZ_1M);

	add_memory_region(start, size, BOOT_MEM_RAM);
}

static bool __init __maybe_unused memory_region_available(phys_addr_t start,
							  phys_addr_t size)
{
	int i;
	bool in_ram = false, free = true;

	for (i = 0; i < boot_mem_map.nr_map; i++) {
		phys_addr_t start_, end_;

		sta