/*
 *  linux/arch/i386/kernel/setup.c
 *
 *  Copyright (C) 1995  Linus Torvalds
 *
 *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
 *
 *  Memory region support
 *      David Parsons <orc@pell.chi.il.us>, July-August 1999
 *
 *  Added E820 sanitization routine (removes overlapping memory regions);
 *  Brian Moyle <bmoyle@mvista.com>, February 2001
 *
 * Moved CPU detection code to cpu/${cpu}.c
 *    Patrick Mochel <mochel@osdl.org>, March 2002
 *
 *  Provisions for empty E820 memory regions (reported by certain BIOSes).
 *  Alex Achenbach <xela@slit.de>, December 2002.
 *
 */

/*
 * This file handles the architecture-dependent parts of initialization
 */

#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/screen_info.h>
#include <linux/ioport.h>
#include <linux/acpi.h>
#include <linux/apm_bios.h>
#include <linux/initrd.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/console.h>
#include <linux/mca.h>
#include <linux/root_dev.h>
#include <linux/highmem.h>
#include <linux/module.h>
#include <linux/efi.h>
#include <linux/init.h>
#include <linux/edd.h>
#include <linux/nodemask.h>
#include <linux/kexec.h>
#include <linux/crash_dump.h>
#include <linux/dmi.h>
#include <linux/pfn.h>

#include <video/edid.h>

#include <asm/apic.h>
#include <asm/e820.h>
#include <asm/mpspec.h>
#include <asm/mmzone.h>
#include <asm/setup.h>
#include <asm/arch_hooks.h>
#include <asm/sections.h>
#include <asm/io_apic.h>
#include <asm/ist.h>
#include <asm/io.h>
#include <asm/vmi.h>
#include <setup_arch.h>
#include <bios_ebda.h>

/* This value is set up by the early boot code to point to the value
   immediately after the boot time page tables.  It contains a *physical*
   address, and must not be in the .bss segment! */
unsigned long init_pg_tables_end __initdata = ~0UL;

int disable_pse __devinitdata = 0;

/*
 * Machine setup..
 */
extern struct resource code_resource;
extern struct resource data_resource;

/* cpu data as detected by the assembly code in head.S */
struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
/* common cpu data for all cpus */
struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
EXPORT_SYMBOL(boot_cpu_data);

unsigned long mmu_cr4_features;

/* for MCA, but anyone else can use it if they want */
unsigned int machine_id;
#ifdef CONFIG_MCA
EXPORT_SYMBOL(machine_id);
#endif
unsigned int machine_submodel_id;
unsigned int BIOS_revision;
unsigned int mca_pentium_flag;

/* Boot loader ID as an integer, for the benefit of proc_dointvec */
int bootloader_type;

/* user-defined highmem size */
static unsigned int highmem_pages = -1;

/*
 * Setup options
 */
struct drive_info_struct { char dummy[32]; } drive_info;
#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_HD) || \
    defined(CONFIG_BLK_DEV_IDE_MODULE) || defined(CONFIG_BLK_DEV_HD_MODULE)
EXPORT_SYMBOL(drive_info);
#endif
struct screen_info screen_info;
EXPORT_SYMBOL(screen_info);
struct apm_info apm_info;
EXPORT_SYMBOL(apm_info);
struct sys_desc_table_struct {
        unsigned short length;
        unsigned char table[0];
};
struct edid_info edid_info;
EXPORT_SYMBOL_GPL(edid_info);
struct ist_info ist_info;
#if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
        defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
EXPORT_SYMBOL(ist_info);
#endif

extern void early_cpu_init(void);
extern int root_mountflags;

unsigned long saved_videomode;

#define RAMDISK_IMAGE_START_MASK        0x07FF
#define RAMDISK_PROMPT_FLAG             0x8000
#define RAMDISK_LOAD_FLAG               0x4000  

static char __initdata command_line[COMMAND_LINE_SIZE];

unsigned char __initdata boot_params[PARAM_SIZE];

#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
struct edd edd;
#ifdef CONFIG_EDD_MODULE
EXPORT_SYMBOL(edd);
#endif
/**
 * copy_edd() - Copy the BIOS EDD information
 *              from boot_params into a safe place.
 *
 */
static inline void copy_edd(void)
{
     memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
     memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
     edd.mbr_signature_nr = EDD_MBR_SIG_NR;
     edd.edd_info_nr = EDD_NR;
}
#else
static inline void copy_edd(void)
{
}
#endif

int __initdata user_defined_memmap = 0;

/*
 * "mem=nopentium" disables the 4MB page tables.
 * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 * to <mem>, overriding the bios size.
 * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 * <start> to <start>+<mem>, overriding the bios size.
 *
 * HPA tells me bootloaders need to parse mem=, so no new
 * option should be mem=  [also see Documentation/i386/boot.txt]
 */
static int __init parse_mem(char *arg)
{
        if (!arg)
                return -EINVAL;

        if (strcmp(arg, "nopentium") == 0) {
                clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
                disable_pse = 1;
        } else {
                /* If the user specifies memory size, we
                 * limit the BIOS-provided memory map to
                 * that size. exactmap can be used to specify
                 * the exact map. mem=number can be used to
                 * trim the existing memory map.
                 */
                unsigned long long mem_size;
 
                mem_size = memparse(arg, &arg);
                limit_regions(mem_size);
                user_defined_memmap = 1;
        }
        return 0;
}
early_param("mem", parse_mem);

#ifdef CONFIG_PROC_VMCORE
/* elfcorehdr= specifies the location of elf core header
 * stored by the crashed kernel.
 */
static int __init parse_elfcorehdr(char *arg)
{
        if (!arg)
                return -EINVAL;

        elfcorehdr_addr = memparse(arg, &arg);
        return 0;
}
early_param("elfcorehdr", parse_elfcorehdr);
#endif /* CONFIG_PROC_VMCORE */

/*
 * highmem=size forces highmem to be exactly 'size' bytes.
 * This works even on boxes that have no highmem otherwise.
 * This also works to reduce highmem size on bigger boxes.
 */
static int __init parse_highmem(char *arg)
{
        if (!arg)
                return -EINVAL;

        highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
        return 0;
}
early_param("highmem", parse_highmem);

/*
 * vmalloc=size forces the vmalloc area to be exactly 'size'
 * bytes. This can be used to increase (or decrease) the
 * vmalloc area - the default is 128m.
 */
static int __init parse_vmalloc(char *arg)
{
        if (!arg)
                return -EINVAL;

        __VMALLOC_RESERVE = memparse(arg, &arg);
        return 0;
}
early_param("vmalloc", parse_vmalloc);

/*
 * reservetop=size reserves a hole at the top of the kernel address space which
 * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 * so relocating the fixmap can be done before paging initialization.
 */
static int __init parse_reservetop(char *arg)
{
        unsigned long address;

        if (!arg)
                return -EINVAL;

        address = memparse(arg, &arg);
        reserve_top_address(address);
        return 0;
}
early_param("reservetop", parse_reservetop);

/*
 * Determine low and high memory ranges:
 */
unsigned long __init find_max_low_pfn(void)
{
        unsigned long max_low_pfn;

        max_low_pfn = max_pfn;
        if (max_low_pfn > MAXMEM_PFN) {
                if (highmem_pages == -1)
                        highmem_pages = max_pfn - MAXMEM_PFN;
                if (highmem_pages + MAXMEM_PFN < max_pfn)
                        max_pfn = MAXMEM_PFN + highmem_pages;
                if (highmem_pages + MAXMEM_PFN > max_pfn) {
                        printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
                        highmem_pages = 0;
                }
                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);
                if (max_pfn > MAX_NONPAE_PFN)
                        printk(KERN_WARNING "Use a PAE enabled kernel.\n");
                else
                        printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
                max_pfn = MAXMEM_PFN;
#else /* !CONFIG_HIGHMEM */
#ifndef CONFIG_X86_PAE
                if (max_pfn > MAX_NONPAE_PFN) {
                        max_pfn = MAX_NONPAE_PFN;
                        printk(KERN_WARNING "Warning only 4GB will be used.\n");
                        printk(KERN_WARNING "Use a PAE enabled kernel.\n");
                }
#endif /* !CONFIG_X86_PAE */
#endif /* !CONFIG_HIGHMEM */
        } else {
                if (highmem_pages == -1)
                        highmem_pages = 0;
#ifdef CONFIG_HIGHMEM
                if (highmem_pages >= max_pfn) {
                        printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
                        highmem_pages = 0;
                }
                if (highmem_pages) {
                        if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
                                printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
                                highmem_pages = 0;
                        }
                        max_low_pfn -= highmem_pages;
                }
#else
                if (highmem_pages)
                        printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
#endif
        }
        return max_low_pfn;
}

/*
 * workaround for Dell systems that neglect to reserve EBDA
 */
static void __init reserve_ebda_region(void)
{
        unsigned int addr;
        addr = get_bios_ebda();
        if (addr)
                reserve_bootmem(addr, PAGE_SIZE);       
}

#ifndef CONFIG_NEED_MULTIPLE_NODES
void __init setup_bootmem_allocator(void);
static unsigned long __init setup_memory(void)
{
        /*
         * partially used pages are not usable - thus
         * we are rounding upwards:
         */
        min_low_pfn = PFN_UP(init_pg_tables_end);

        find_max_pfn();

        max_low_pfn = find_max_low_pfn();

#ifdef CONFIG_HIGHMEM
        highstart_pfn = highend_pfn = max_pfn;
        if (max_pfn > max_low_pfn) {
                highstart_pfn = max_low_pfn;
        }
        printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
                pages_to_mb(highend_pfn - highstart_pfn));
        num_physpages = highend_pfn;
        high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
#else
        num_physpages = max_low_pfn;
        high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
#endif
#ifdef CONFIG_FLATMEM
        max_mapnr = num_physpages;
#endif
        printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
                        pages_to_mb(max_low_pfn));

        setup_bootmem_allocator();

        return max_low_pfn;
}

void __init zone_sizes_init(void)
{
        unsigned long max_zone_pfns[MAX_NR_ZONES];
        memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
        max_zone_pfns[ZONE_DMA] =
                virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
        max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
#ifdef CONFIG_HIGHMEM
        max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
        add_active_range(0, 0, highend_pfn);
#else
        add_active_range(0, 0, max_low_pfn);
#endif

        free_area_init_nodes(max_zone_pfns);
}
#else
extern unsigned long __init setup_memory(void);
extern void zone_sizes_init(void);
#endif /* !CONFIG_NEED_MULTIPLE_NODES */

void __init setup_bootmem_allocator(void)
{
        unsigned long bootmap_size;
        /*
         * Initialize the boot-time allocator (with low memory only):
         */
        bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);

        register_bootmem_low_pages(max_low_pfn);

        /*
         * Reserve the bootmem bitmap itself as well. We do this in two
         * steps (first step was init_bootmem()) because this catches
         * the (very unlikely) case of us accidentally initializing the
         * bootmem allocator with an invalid RAM area.
         */
        reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
                         bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));

        /*
         * reserve physical page 0 - it's a special BIOS page on many boxes,
         * enabling clean reboots, SMP operation, laptop functions.
         */
        reserve_bootmem(0, PAGE_SIZE);

        /* reserve EBDA region, it's a 4K region */
        reserve_ebda_region();

    /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
       PCI prefetch into it (errata #56). Usually the page is reserved anyways,
       unless you have no PS/2 mouse plugged in. */
        if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
            boot_cpu_data.x86 == 6)
             reserve_bootmem(0xa0000 - 4096, 4096);

#ifdef CONFIG_SMP
        /*
         * But first pinch a few for the stack/trampoline stuff
         * FIXME: Don't need the extra page at 4K, but need to fix
         * trampoline before removing it. (see the GDT stuff)
         */
        reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
#endif
#ifdef CONFIG_ACPI_SLEEP
        /*
         * Reserve low memory region for sleep support.
         */
        acpi_reserve_bootmem();
#endif
#ifdef CONFIG_X86_FIND_SMP_CONFIG
        /*
         * Find and reserve possible boot-time SMP configuration:
         */
        find_smp_config();
#endif
        numa_kva_reserve();
#ifdef CONFIG_BLK_DEV_INITRD
        if (LOADER_TYPE && INITRD_START) {
                if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
                        reserve_bootmem(INITRD_START, INITRD_SIZE);
                        initrd_start = INITRD_START + PAGE_OFFSET;
                        initrd_end = initrd_start+INITRD_SIZE;
                }
                else {
                        printk(KERN_ERR "initrd extends beyond end of memory "
                            "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
                            INITRD_START + INITRD_SIZE,
                            max_low_pfn << PAGE_SHIFT);
                        initrd_start = 0;
                }
        }
#endif
#ifdef CONFIG_KEXEC
        if (crashk_res.start != crashk_res.end)
                reserve_bootmem(crashk_res.start,
                        crashk_res.end - crashk_res.start + 1);
#endif
}

/*
 * The node 0 pgdat is initialized before all of these because
 * it's needed for bootmem.  node>0 pgdats have their virtual
 * space allocated before the pagetables are in place to access
 * them, so they can't be cleared then.
 *
 * This should all compile down to nothing when NUMA is off.
 */
void __init remapped_pgdat_init(void)
{
        int nid;

        for_each_online_node(nid) {
                if (nid != 0)
                        memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
        }
}

#ifdef CONFIG_MCA
static void set_mca_bus(int x)
{
        MCA_bus = x;
}
#else
static void set_mca_bus(int x) { }
#endif

/* Overridden in paravirt.c if CONFIG_PARAVIRT */
char * __init __attribute__((weak)) memory_setup(void)
{
        return machine_specific_memory_setup();
}

/*
 * Determine if we were loaded by an EFI loader.  If so, then we have also been
 * passed the efi memmap, systab, etc., so we should use these data structures
 * for initialization.  Note, the efi init code path is determined by the
 * global efi_enabled. This allows the same kernel image to be used on existing
 * systems (with a traditional BIOS) as well as on EFI systems.
 */
void __init setup_arch(char **cmdline_p)
{
        unsigned long max_low_pfn;

        memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
        pre_setup_arch_hook();
        early_cpu_init();

        /*
         * FIXME: This isn't an official loader_type right
         * now but does currently work with elilo.
         * If we were configured as an EFI kernel, check to make
         * sure that we were loaded correctly from elilo and that
         * the system table is valid.  If not, then initialize normally.
         */
#ifdef CONFIG_EFI
        if ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
                efi_enabled = 1;
#endif

        ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
        drive_info = DRIVE_INFO;
        screen_info = SCREEN_INFO;
        edid_info = EDID_INFO;
        apm_info.bios = APM_BIOS_INFO;
        ist_info = IST_INFO;
        saved_videomode = VIDEO_MODE;
        if( SYS_DESC_TABLE.length != 0 ) {
                set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2);
                machine_id = SYS_DESC_TABLE.table[0];
                machine_submodel_id = SYS_DESC_TABLE.table[1];
                BIOS_revision = SYS_DESC_TABLE.table[2];
        }
        bootloader_type = LOADER_TYPE;

#ifdef CONFIG_BLK_DEV_RAM
        rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
        rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
        rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
#endif
        ARCH_SETUP
        if (efi_enabled)
                efi_init();
        else {
                printk(KERN_INFO "BIOS-provided physical RAM map:\n");
                print_memory_map(memory_setup());
        }

        copy_edd();

        if (!MOUNT_ROOT_RDONLY)
                root_mountflags &= ~MS_RDONLY;
        init_mm.start_code = (unsigned long) _text;
        init_mm.end_code = (unsigned long) _etext;
        init_mm.end_data = (unsigned long) _edata;
        init_mm.brk = init_pg_tables_end + PAGE_OFFSET;

        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;

        parse_early_param();

        if (user_defined_memmap) {
                printk(KERN_INFO "user-defined physical RAM map:\n");
                print_memory_map("user");
        }

        strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
        *cmdline_p = command_line;

        max_low_pfn = setup_memory();

#ifdef CONFIG_VMI
        /*
         * Must be after max_low_pfn is determined, and before kernel
         * pagetables are setup.
         */
        vmi_init();
#endif

        /*
         * NOTE: before this point _nobody_ is allowed to allocate
         * any memory using the bootmem allocator.  Although the
         * alloctor is now initialised only the first 8Mb of the kernel
         * virtual address space has been mapped.  All allocations before
         * paging_init() has completed must use the alloc_bootmem_low_pages()
         * variant (which allocates DMA'able memory) and care must be taken
         * not to exceed the 8Mb limit.
         */

#ifdef CONFIG_SMP
        smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
#endif
        paging_init();
        remapped_pgdat_init();
        sparse_init();
        zone_sizes_init();

        /*
         * NOTE: at this point the bootmem allocator is fully available.
         */

        dmi_scan_machine();

#ifdef CONFIG_X86_GENERICARCH
        generic_apic_probe();
#endif  
        if (efi_enabled)
                efi_map_memmap();

#ifdef CONFIG_ACPI
        /*
         * Parse the ACPI tables for possible boot-time SMP configuration.
         */
        acpi_boot_table_init();
#endif

#ifdef CONFIG_PCI
#ifdef CONFIG_X86_IO_APIC
        check_acpi_pci();       /* Checks more than just ACPI actually */
#endif
#endif

#ifdef CONFIG_ACPI
        acpi_boot_init();

#if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
        if (def_to_bigsmp)
                printk(KERN_WARNING "More than 8 CPUs detected and "
                        "CONFIG_X86_PC cannot handle it.\nUse "
                        "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
#endif
#endif
#ifdef CONFIG_X86_LOCAL_APIC
        if (smp_found_config)
                get_smp_config();
#endif

        e820_register_memory();

#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
        if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
                conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
        conswitchp = &dummy_con;
#endif
#endif
}