1 files changed, 653 insertions, 0 deletions

diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
new file mode 100644
index 000000000000..d474cd639bcb
--- /dev/null
+++ b/arch/x86/kernel/setup_32.c
@@ -0,0 +1,653 @@
+/*
+ *  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 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, 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 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 */
+
+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.
+ */
+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 ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
+                efi_enabled = 1;
+#endif
+
+        ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
+        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.
+         */
+
+        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
+#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();
+        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
+}