/*
 * 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  Maciej W. Rozycki
 */
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/utsname.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#include <linux/bootmem.h>
#include <linux/initrd.h>
#include <linux/major.h>
#include <linux/kdev_t.h>
#include <linux/root_dev.h>
#include <linux/highmem.h>
#include <linux/console.h>

#include <asm/addrspace.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/system.h>

struct cpuinfo_mips cpu_data[NR_CPUS];

EXPORT_SYMBOL(cpu_data);

#ifdef CONFIG_VT
struct screen_info screen_info;
#endif

/*
 * Despite it's name this variable is even if we don't have PCI
 */
unsigned int PCI_DMA_BUS_IS_PHYS;

EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);

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

EXPORT_SYMBOL(mips_machtype);
EXPORT_SYMBOL(mips_machgroup);

struct boot_mem_map boot_mem_map;

static char command_line[CL_SIZE];
       char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;

/*
 * 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);

/*
 * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
 * for the processor.
 */
unsigned long isa_slot_offset;
EXPORT_SYMBOL(isa_slot_offset);

static struct resource code_resource = { "Kernel code" };
static struct resource data_resource = { "Kernel data" };

void __init add_memory_region(phys_t start, phys_t size, long type)
{
        int x = boot_mem_map.nr_map;
        struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;

        /*
         * Try to merge with previous entry if any.  This is far less than
         * perfect but is sufficient for most real world cases.
         */
        if (x && prev->addr + prev->size == start && prev->type == type) {
                prev->size += size;
                return;
        }

        if (x == BOOT_MEM_MAP_MAX) {
                printk("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++;
}

static void __init print_memory_map(void)
{
        int i;
        const int field = 2 * sizeof(unsigned long);

        for (i = 0; i < boot_mem_map.nr_map; i++) {
                printk(" memory: %0*Lx @ %0*Lx ",
                       field, (unsigned long long) boot_mem_map.map[i].size,
                       field, (unsigned long long) boot_mem_map.map[i].addr);

                switch (boot_mem_map.map[i].type) {
                case BOOT_MEM_RAM:
                        printk("(usable)\n");
                        break;
                case BOOT_MEM_ROM_DATA:
                        printk("(ROM data)\n");
                        break;
                case BOOT_MEM_RESERVED:
                        printk("(reserved)\n");
                        break;
                default:
                        printk("type %lu\n", boot_mem_map.map[i].type);
                        break;
                }
        }
}

static inline void parse_cmdline_early(void)
{
        char c = ' ', *to = command_line, *from = saved_command_line;
        unsigned long start_at, mem_size;
        int len = 0;
        int usermem = 0;

        printk("Determined physical RAM map:\n");
        print_memory_map();

        for (;;) {
                /*
                 * "mem=XXX[kKmM]" defines a memory region from
                 * 0 to <XXX>, overriding the determined size.
                 * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
                 * <YYY> to <YYY>+<XXX>, overriding the determined size.
                 */
                if (c == ' ' && !memcmp(from, "mem=", 4)) {
                        if (to != command_line)
                                to--;
                        /*
                         * If a user specifies memory size, we
                         * blow away any automatically generated
                         * size.
                         */
                        if (usermem == 0) {
                                boot_mem_map.nr_map = 0;
                                usermem = 1;
                        }
                        mem_size = memparse(from + 4, &from);
                        if (*from == '@')
                                start_at = memparse(from + 1, &from);
                        else
                                start_at = 0;
                        add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
                }
                c = *(from++);
                if (!c)
                        break;
                if (CL_SIZE <= ++len)
                        break;
                *(to++) = c;
        }
        *to = '\0';

        if (usermem) {
                printk("User-defined physical RAM map:\n");
                print_memory_map();
        }
}

static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end)
{
        /*
         * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
         * "rd_size=0xNN" it's size
         */
        unsigned long start = 0;
        unsigned long size = 0;
        unsigned long end;
        char cmd_line[CL_SIZE];
        char *start_str;
        char *size_str;
        char *tmp;

        strcpy(cmd_line, command_line);
        *command_line = 0;
        tmp = cmd_line;
        /* Ignore "rd_start=" strings in other parameters. */
        start_str = strstr(cmd_line, "rd_start=");
        if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
                start_str = strstr(start_str, " rd_start=");
        while (start_str) {
                if (start_str != cmd_line)
                        strncat(command_line, tmp, start_str - tmp);
                start = memparse(start_str + 9, &start_str);
                tmp = start_str + 1;
                start_str = strstr(start_str, " rd_start=");
        }
        if (*tmp)
                strcat(command_line, tmp);

        strcpy(cmd_line, command_line);
        *command_line = 0;
        tmp = cmd_line;
        /* Ignore "rd_size" strings in other parameters. */
        size_str = strstr(cmd_line, "rd_size=");
        if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
                size_str = strstr(size_str, " rd_size=");
        while (size_str) {
                if (size_str != cmd_line)
                        strncat(command_line, tmp, size_str - tmp);
                size = memparse(size_str + 8, &size_str);
                tmp = size_str + 1;
                size_str = strstr(size_str, " rd_size=");
        }
        if (*tmp)
                strcat(command_line, tmp);

#ifdef CONFIG_MIPS64
        /* HACK: Guess if the sign extension was forgotten */
        if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
                start |= 0xffffffff00000000;
#endif

        end = start + size;
        if (start && end) {
                *rd_start = start;
                *rd_end = end;
                return 1;
        }
        return 0;
}

#define PFN_UP(x)       (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
#define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
#define PFN_PHYS(x)     ((x) << PAGE_SHIFT)

#define MAXMEM          HIGHMEM_START
#define MAXMEM_PFN      PFN_DOWN(MAXMEM)

static inline void bootmem_init(void)
{
        unsigned long start_pfn;
        unsigned long reserved_end = (unsigned long)&_end;
#ifndef CONFIG_SGI_IP27
        unsigned long first_usable_pfn;
        unsigned long bootmap_size;
        int i;
#endif
#ifdef CONFIG_BLK_DEV_INITRD
        int initrd_reserve_bootmem = 0;

        /* Board specific code should have set up initrd_start and initrd_end */
        ROOT_DEV = Root_RAM0;
        if (parse_rd_cmdline(&initrd_start, &initrd_end)) {
                reserved_end = max(reserved_end, initrd_end);
                initrd_reserve_bootmem = 1;
        } else {
                unsigned long tmp;
                u32 *initrd_header;

                tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2;
                if (tmp < reserved_end)
                        tmp += PAGE_SIZE;
                initrd_header = (u32 *)tmp;
                if (initrd_header[0] == 0x494E5244) {
                        initrd_start = (unsigned long)&initrd_header[2];
                        initrd_end = initrd_start + initrd_header[1];
                        reserved_end = max(reserved_end, initrd_end);
                        initrd_reserve_bootmem = 1;
                }
        }
#endif  /* CONFIG_BLK_DEV_INITRD */

        /*
         * Partially used pages are not usable - thus
         * we are rounding upwards.
         */
        start_pfn = PFN_UP(CPHYSADDR(reserved_end));

#ifndef CONFIG_SGI_IP27
        /* Find the highest page frame number we have available.  */
        max_pfn = 0;
        first_usable_pfn = -1UL;
        for (i = 0; i < boot_mem_map.nr_map; i++) {
                unsigned long start, end;

                if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
                        continue;

                start = PFN_UP(boot_mem_map.map[i].addr);
                end = PFN_DOWN(boot_mem_map.map[i].addr
                      + boot_mem_map.map[i].size);

                if (start >= end)
                        continue;
                if (end > max_pfn)
                        max_pfn = end;
                if (start < first_usable_pfn) {
                        if (start > start_pfn) {
                                first_usable_pfn = start;
                        } else if (end > start_pfn) {
                                first_usable_pfn = start_pfn;
                        }
                }
        }

        /*
         * Determine low and high memory ranges
         */
        max_low_pfn = max_pfn;
        if (max_low_pfn > MAXMEM_PFN) {
                max_low_pfn = MAXMEM_PFN;
#ifndef CONFIG_HIGHMEM
                /* Maximum memory usable is what is directly addressable */
                printk(KERN_WARNING "Warning only %ldMB will be used.\n",
                       MAXMEM >> 20);
                printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
#endif
        }

#ifdef CONFIG_HIGHMEM
        /*
         * Crude, we really should make a better attempt at detecting
         * highstart_pfn
         */
        highstart_pfn = highend_pfn = max_pfn;
        if (max_pfn > MAXMEM_PFN) {
                highstart_pfn = MAXMEM_PFN;
                printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
                       (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
        }
#endif

        /* Initialize the boot-time allocator with low memory only.  */
        bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);

        /*
         * Register fully available low RAM pages with the bootmem allocator.
         */
        for (i = 0; i < boot_mem_map.nr_map; i++) {
                unsigned long curr_pfn, last_pfn, size;

                /*
                 * Reserve usable memory.
                 */
                if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
                        continue;

                /*
                 * We are rounding up the start address of usable memory:
                 */
                curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
                if (curr_pfn >= max_low_pfn)
                        continue;
                if (curr_pfn < start_pfn)
                        curr_pfn = start_pfn;

                /*
                 * ... and at the end of the usable range downwards:
                 */
                last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
                                    + boot_mem_map.map[i].size);

                if (last_pfn > max_low_pfn)
                        last_pfn = max_low_pfn;

                /*
                 * Only register lowmem part of lowmem segment with bootmem.
                 */
                size = last_pfn - curr_pfn;
                if (curr_pfn > PFN_DOWN(HIGHMEM_START))
                        continue;
                if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
                        size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
                if (!size)
                        continue;

                /*
                 * ... finally, did all the rounding and playing
                 * around just make the area go away?
                 */
                if (last_pfn <= curr_pfn)
                        continue;

                /* Register lowmem ranges */
                free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
        }

        /* Reserve the bootmap memory.  */
        reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
#endif /* CONFIG_SGI_IP27 */

#ifdef CONFIG_BLK_DEV_INITRD
        initrd_below_start_ok = 1;
        if (initrd_start) {
                unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
                printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
                       (void *)initrd_start, initrd_size);

                if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
                        printk("initrd extends beyond end of memory "
                               "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
                               sizeof(long) * 2,
                               (unsigned long long)CPHYSADDR(initrd_end),
                               sizeof(long) * 2,
                               (unsigned long long)PFN_PHYS(max_low_pfn));
                        initrd_start = initrd_end = 0;
                        initrd_reserve_bootmem = 0;
                }

                if (initrd_reserve_bootmem)
                        reserve_bootmem(CPHYSADDR(initrd_start), initrd_size);
        }
#endif /* CONFIG_BLK_DEV_INITRD  */
}

static inline void resource_init(void)
{
        int i;

#if defined(CONFIG_MIPS64) && !defined(CONFIG_BUILD_ELF64)
        /*
         * The 64bit code in 32bit object format trick can't represent
         * 64bit wide relocations for linker script symbols.
         */
        code_resource.start = CPHYSADDR(&_text);
        code_resource.end = CPHYSADDR(&_etext) - 1;
        data_resource.start = CPHYSADDR(&_etext);
        data_resource.end = CPHYSADDR(&_edata) - 1;
#else
        code_resource.start = virt_to_phys(&_text);
        code_resource.end = virt_to_phys(&_etext) - 1;
        data_resource.start = virt_to_phys(&_etext);
        data_resource.end = virt_to_phys(&_edata) - 1;
#endif

        /*
         * Request address space for all standard RAM.
         */
        for (i = 0; i < boot_mem_map.nr_map; i++) {
                struct resource *res;
                unsigned long start, end;

                start = boot_mem_map.map[i].addr;
                end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
                if (start >= MAXMEM)
                        continue;
                if (end >= MAXMEM)
                        end = MAXMEM - 1;

                res = alloc_bootmem(sizeof(struct resource));
                switch (boot_mem_map.map[i].type) {
                case BOOT_MEM_RAM:
                case BOOT_MEM_ROM_DATA:
                        res->name = "System RAM";
                        break;
                case BOOT_MEM_RESERVED:
                default:
                        res->name = "reserved";
                }

                res->start = start;
                res->end = end;

                res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
                request_resource(&iomem_resource, res);

                /*
                 *  We don't know which RAM region contains kernel data,
                 *  so we try it repeatedly and let the resource manager
                 *  test it.
                 */
                request_resource(res, &code_resource);
                request_resource(res, &data_resource);
        }
}

#undef PFN_UP
#undef PFN_DOWN
#undef PFN_PHYS

#undef MAXMEM
#undef MAXMEM_PFN

static int __initdata earlyinit_debug;

static int __init earlyinit_debug_setup(char *str)
{
        earlyinit_debug = 1;
        return 1;
}
__setup("earlyinit_debug", earlyinit_debug_setup);

extern initcall_t __earlyinitcall_start, __earlyinitcall_end;

static void __init do_earlyinitcalls(void)
{
        initcall_t *call, *start, *end;

        start = &__earlyinitcall_start;
        end = &__earlyinitcall_end;

        for (call = start; call < end; call++) {
                if (earlyinit_debug)
                        printk("calling earlyinitcall 0x%p\n", *call);

                (*call)();
        }
}

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

        /* call board setup routine */
        do_earlyinitcalls();

        strlcpy(command_line, arcs_cmdline, sizeof(command_line));
        strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);

        *cmdline_p = command_line;

        parse_cmdline_early();
        bootmem_init();
        paging_init();
        resource_init();
}

int __init fpu_disable(char *s)
{
        cpu_data[0].options &= ~MIPS_CPU_FPU;

        return 1;
}

__setup("nofpu", fpu_disable);