Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *  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>

#include <asm/cacheflush.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 __cpuinitdata = 0;

/*

 * Machine setup..

 */

extern struct resource code_resource;

extern struct resource data_resource;

extern struct resource bss_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;

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 screen_info screen_info;

EXPORT_SYMBOL(screen_info);

struct apm_info apm_info;

EXPORT_SYMBOL(apm_info);

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];

struct boot_params __initdata boot_params;

#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, boot_params.edd_mbr_sig_buffer,

            sizeof(edd.mbr_signature));

     memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));

     edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;

     edd.edd_info_nr = boot_params.eddbuf_entries;

}

#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 HIGHMEM64G enabled kernel.\n");

                else

                        printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");

                max_pfn = MAXMEM_PFN;

#else /* !CONFIG_HIGHMEM */

#ifndef CONFIG_HIGHMEM64G

                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 HIGHMEM64G enabled kernel.\n");

                }

#endif /* !CONFIG_HIGHMEM64G */

#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 */

static inline unsigned long long get_total_mem(void)

{

        unsigned long long total;

        total = max_low_pfn - min_low_pfn;

#ifdef CONFIG_HIGHMEM

        total += highend_pfn - highstart_pfn;

#endif

        return total << PAGE_SHIFT;

}

#ifdef CONFIG_KEXEC

static void __init reserve_crashkernel(void)

{

        unsigned long long total_mem;

        unsigned long long crash_size, crash_base;

        int ret;

        total_mem = get_total_mem();

        ret = parse_crashkernel(boot_command_line, total_mem,

                        &crash_size, &crash_base);

        if (ret == 0 && crash_size > 0) {

                if (crash_base > 0) {

                        printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "

                                        "for crashkernel (System RAM: %ldMB)\n",

                                        (unsigned long)(crash_size >> 20),

                                        (unsigned long)(crash_base >> 20),

                                        (unsigned long)(total_mem >> 20));

                        crashk_res.start = crash_base;

                        crashk_res.end   = crash_base + crash_size - 1;

                        reserve_bootmem(crash_base, crash_size);

                } else

                        printk(KERN_INFO "crashkernel reservation failed - "

                                        "you have to specify a base address\n");

        }

}

#else

static inline void __init reserve_crashkernel(void)

{}

#endif

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 (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {

                unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;

                unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;

                unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;

                unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;

                if (ramdisk_end <= end_of_lowmem) {

                        reserve_bootmem(ramdisk_image, ramdisk_size);

                        initrd_start = ramdisk_image + PAGE_OFFSET;

                        initrd_end = initrd_start+ramdisk_size;

                } else {

                        printk(KERN_ERR "initrd extends beyond end of memory "

                               "(0x%08lx > 0x%08lx)\ndisabling initrd\n",

                               ramdisk_end, end_of_lowmem);

                        initrd_start = 0;

                }

        }

#endif

        reserve_crashkernel();

}

/*

 * 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.

 */

static 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 ((boot_params.hdr.type_of_loader == 0x50) &&

            boot_params.efi_info.efi_systab)

                efi_enabled = 1;

#endif

        ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);

        screen_info = boot_params.screen_info;

        edid_info = boot_params.edid_info;

        apm_info.bios = boot_params.apm_bios_info;

        ist_info = boot_params.ist_info;

        saved_videomode = boot_params.hdr.vid_mode;

        if( boot_params.sys_desc_table.length != 0 ) {

                set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);

                machine_id = boot_params.sys_desc_table.table[0];

                machine_submodel_id = boot_params.sys_desc_table.table[1];

                BIOS_revision = boot_params.sys_desc_table.table[2];

        }

        bootloader_type = boot_params.hdr.type_of_loader;

#ifdef CONFIG_BLK_DEV_RAM

        rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;

        rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);

        rd_doload = ((boot_params.hdr.ram_size & 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 (!boot_params.hdr.root_flags)

                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;

        bss_resource.start = virt_to_phys(&__bss_start);

        bss_resource.end = virt_to_phys(&__bss_stop)-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

         * allocator 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.

         */

        paravirt_post_allocator_init();

        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

        early_quirks();

#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();

        e820_mark_nosave_regions();

#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

}