1 files changed, 778 insertions, 0 deletions

diff --git a/arch/ppc/kernel/setup.c b/arch/ppc/kernel/setup.c
new file mode 100644
index 000000000000..e97ce635b99e
--- /dev/null
+++ b/arch/ppc/kernel/setup.c
@@ -0,0 +1,778 @@
+/*
+ * Common prep/pmac/chrp boot and setup code.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/reboot.h>
+#include <linux/delay.h>
+#include <linux/initrd.h>
+#include <linux/ide.h>
+#include <linux/tty.h>
+#include <linux/bootmem.h>
+#include <linux/seq_file.h>
+#include <linux/root_dev.h>
+#include <linux/cpu.h>
+#include <linux/console.h>
+
+#include <asm/residual.h>
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/processor.h>
+#include <asm/pgtable.h>
+#include <asm/bootinfo.h>
+#include <asm/setup.h>
+#include <asm/amigappc.h>
+#include <asm/smp.h>
+#include <asm/elf.h>
+#include <asm/cputable.h>
+#include <asm/bootx.h>
+#include <asm/btext.h>
+#include <asm/machdep.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/pmac_feature.h>
+#include <asm/sections.h>
+#include <asm/nvram.h>
+#include <asm/xmon.h>
+#include <asm/ocp.h>
+
+#if defined(CONFIG_85xx) || defined(CONFIG_83xx)
+#include <asm/ppc_sys.h>
+#endif
+
+#if defined CONFIG_KGDB
+#include <asm/kgdb.h>
+#endif
+
+extern void platform_init(unsigned long r3, unsigned long r4,
+                unsigned long r5, unsigned long r6, unsigned long r7);
+extern void bootx_init(unsigned long r4, unsigned long phys);
+extern void identify_cpu(unsigned long offset, unsigned long cpu);
+extern void do_cpu_ftr_fixups(unsigned long offset);
+extern void reloc_got2(unsigned long offset);
+
+extern void ppc6xx_idle(void);
+extern void power4_idle(void);
+
+extern boot_infos_t *boot_infos;
+struct ide_machdep_calls ppc_ide_md;
+char *sysmap;
+unsigned long sysmap_size;
+
+/* Used with the BI_MEMSIZE bootinfo parameter to store the memory
+   size value reported by the boot loader. */
+unsigned long boot_mem_size;
+
+unsigned long ISA_DMA_THRESHOLD;
+unsigned long DMA_MODE_READ, DMA_MODE_WRITE;
+
+#ifdef CONFIG_PPC_MULTIPLATFORM
+int _machine = 0;
+
+extern void prep_init(unsigned long r3, unsigned long r4,
+                unsigned long r5, unsigned long r6, unsigned long r7);
+extern void pmac_init(unsigned long r3, unsigned long r4,
+                unsigned long r5, unsigned long r6, unsigned long r7);
+extern void chrp_init(unsigned long r3, unsigned long r4,
+                unsigned long r5, unsigned long r6, unsigned long r7);
+#endif /* CONFIG_PPC_MULTIPLATFORM */
+
+#ifdef CONFIG_MAGIC_SYSRQ
+unsigned long SYSRQ_KEY = 0x54;
+#endif /* CONFIG_MAGIC_SYSRQ */
+
+#ifdef CONFIG_VGA_CONSOLE
+unsigned long vgacon_remap_base;
+#endif
+
+struct machdep_calls ppc_md;
+
+/*
+ * These are used in binfmt_elf.c to put aux entries on the stack
+ * for each elf executable being started.
+ */
+int dcache_bsize;
+int icache_bsize;
+int ucache_bsize;
+
+#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) || \
+    defined(CONFIG_FB_VGA16_MODULE) || defined(CONFIG_FB_VESA)
+struct screen_info screen_info = {
+        0, 25,                  /* orig-x, orig-y */
+        0,                      /* unused */
+        0,                      /* orig-video-page */
+        0,                      /* orig-video-mode */
+        80,                     /* orig-video-cols */
+        0,0,0,                  /* ega_ax, ega_bx, ega_cx */
+        25,                     /* orig-video-lines */
+        1,                      /* orig-video-isVGA */
+        16                      /* orig-video-points */
+};
+#endif /* CONFIG_VGA_CONSOLE || CONFIG_FB_VGA16 || CONFIG_FB_VESA */
+
+void machine_restart(char *cmd)
+{
+#ifdef CONFIG_NVRAM
+        nvram_sync();
+#endif
+        ppc_md.restart(cmd);
+}
+
+EXPORT_SYMBOL(machine_restart);
+
+void machine_power_off(void)
+{
+#ifdef CONFIG_NVRAM
+        nvram_sync();
+#endif
+        ppc_md.power_off();
+}
+
+EXPORT_SYMBOL(machine_power_off);
+
+void machine_halt(void)
+{
+#ifdef CONFIG_NVRAM
+        nvram_sync();
+#endif
+        ppc_md.halt();
+}
+
+EXPORT_SYMBOL(machine_halt);
+
+void (*pm_power_off)(void) = machine_power_off;
+
+#ifdef CONFIG_TAU
+extern u32 cpu_temp(unsigned long cpu);
+extern u32 cpu_temp_both(unsigned long cpu);
+#endif /* CONFIG_TAU */
+
+int show_cpuinfo(struct seq_file *m, void *v)
+{
+        int i = (int) v - 1;
+        int err = 0;
+        unsigned int pvr;
+        unsigned short maj, min;
+        unsigned long lpj;
+
+        if (i >= NR_CPUS) {
+                /* Show summary information */
+#ifdef CONFIG_SMP
+                unsigned long bogosum = 0;
+                for (i = 0; i < NR_CPUS; ++i)
+                        if (cpu_online(i))
+                                bogosum += cpu_data[i].loops_per_jiffy;
+                seq_printf(m, "total bogomips\t: %lu.%02lu\n",
+                           bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
+#endif /* CONFIG_SMP */
+
+                if (ppc_md.show_cpuinfo != NULL)
+                        err = ppc_md.show_cpuinfo(m);
+                return err;
+        }
+
+#ifdef CONFIG_SMP
+        if (!cpu_online(i))
+                return 0;
+        pvr = cpu_data[i].pvr;
+        lpj = cpu_data[i].loops_per_jiffy;
+#else
+        pvr = mfspr(SPRN_PVR);
+        lpj = loops_per_jiffy;
+#endif
+
+        seq_printf(m, "processor\t: %d\n", i);
+        seq_printf(m, "cpu\t\t: ");
+
+        if (cur_cpu_spec[i]->pvr_mask)
+                seq_printf(m, "%s", cur_cpu_spec[i]->cpu_name);
+        else
+                seq_printf(m, "unknown (%08x)", pvr);
+#ifdef CONFIG_ALTIVEC
+        if (cur_cpu_spec[i]->cpu_features & CPU_FTR_ALTIVEC)
+                seq_printf(m, ", altivec supported");
+#endif
+        seq_printf(m, "\n");
+
+#ifdef CONFIG_TAU
+        if (cur_cpu_spec[i]->cpu_features & CPU_FTR_TAU) {
+#ifdef CONFIG_TAU_AVERAGE
+                /* more straightforward, but potentially misleading */
+                seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
+                           cpu_temp(i));
+#else
+                /* show the actual temp sensor range */
+                u32 temp;
+                temp = cpu_temp_both(i);
+                seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
+                           temp & 0xff, temp >> 16);
+#endif
+        }
+#endif /* CONFIG_TAU */
+
+        if (ppc_md.show_percpuinfo != NULL) {
+                err = ppc_md.show_percpuinfo(m, i);
+                if (err)
+                        return err;
+        }
+
+        switch (PVR_VER(pvr)) {
+        case 0x0020:    /* 403 family */
+                maj = PVR_MAJ(pvr) + 1;
+                min = PVR_MIN(pvr);
+                break;
+        case 0x1008:    /* 740P/750P ?? */
+                maj = ((pvr >> 8) & 0xFF) - 1;
+                min = pvr & 0xFF;
+                break;
+        case 0x8083:    /* e300 */
+                maj = PVR_MAJ(pvr);
+                min = PVR_MIN(pvr);
+                break;
+        case 0x8020:    /* e500 */
+                maj = PVR_MAJ(pvr);
+                min = PVR_MIN(pvr);
+                break;
+        default:
+                maj = (pvr >> 8) & 0xFF;
+                min = pvr & 0xFF;
+                break;
+        }
+
+        seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
+                   maj, min, PVR_VER(pvr), PVR_REV(pvr));
+
+        seq_printf(m, "bogomips\t: %lu.%02lu\n",
+                   lpj / (500000/HZ), (lpj / (5000/HZ)) % 100);
+
+#if defined(CONFIG_85xx) || defined(CONFIG_83xx)
+        if (cur_ppc_sys_spec->ppc_sys_name)
+                seq_printf(m, "chipset\t\t: %s\n",
+                        cur_ppc_sys_spec->ppc_sys_name);
+#endif
+
+#ifdef CONFIG_SMP
+        seq_printf(m, "\n");
+#endif
+
+        return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+        int i = *pos;
+
+        return i <= NR_CPUS? (void *) (i + 1): NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        ++*pos;
+        return c_start(m, pos);
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+struct seq_operations cpuinfo_op = {
+        .start =c_start,
+        .next = c_next,
+        .stop = c_stop,
+        .show = show_cpuinfo,
+};
+
+/*
+ * We're called here very early in the boot.  We determine the machine
+ * type and call the appropriate low-level setup functions.
+ *  -- Cort <cort@fsmlabs.com>
+ *
+ * Note that the kernel may be running at an address which is different
+ * from the address that it was linked at, so we must use RELOC/PTRRELOC
+ * to access static data (including strings).  -- paulus
+ */
+__init
+unsigned long
+early_init(int r3, int r4, int r5)
+{
+        unsigned long phys;
+        unsigned long offset = reloc_offset();
+
+        /* Default */
+        phys = offset + KERNELBASE;
+
+        /* First zero the BSS -- use memset, some arches don't have
+         * caches on yet */
+        memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
+
+        /*
+         * Identify the CPU type and fix up code sections
+         * that depend on which cpu we have.
+         */
+        identify_cpu(offset, 0);
+        do_cpu_ftr_fixups(offset);
+
+#if defined(CONFIG_PPC_MULTIPLATFORM)
+        reloc_got2(offset);
+
+        /* If we came here from BootX, clear the screen,
+         * set up some pointers and return. */
+        if ((r3 == 0x426f6f58) && (r5 == 0))
+                bootx_init(r4, phys);
+
+        /*
+         * don't do anything on prep
+         * for now, don't use bootinfo because it breaks yaboot 0.5
+         * and assume that if we didn't find a magic number, we have OF
+         */
+        else if (*(unsigned long *)(0) != 0xdeadc0de)
+                phys = prom_init(r3, r4, (prom_entry)r5);
+
+        reloc_got2(-offset);
+#endif
+
+        return phys;
+}
+
+#ifdef CONFIG_PPC_OF
+/*
+ * Assume here that all clock rates are the same in a
+ * smp system.  -- Cort
+ */
+int __openfirmware
+of_show_percpuinfo(struct seq_file *m, int i)
+{
+        struct device_node *cpu_node;
+        u32 *fp;
+        int s;
+        
+        cpu_node = find_type_devices("cpu");
+        if (!cpu_node)
+                return 0;
+        for (s = 0; s < i && cpu_node->next; s++)
+                cpu_node = cpu_node->next;
+        fp = (u32 *)get_property(cpu_node, "clock-frequency", NULL);
+        if (fp)
+                seq_printf(m, "clock\t\t: %dMHz\n", *fp / 1000000);
+        return 0;
+}
+
+void __init
+intuit_machine_type(void)
+{
+        char *model;
+        struct device_node *root;
+        
+        /* ask the OF info if we're a chrp or pmac */
+        root = find_path_device("/");
+        if (root != 0) {
+                /* assume pmac unless proven to be chrp -- Cort */
+                _machine = _MACH_Pmac;
+                model = get_property(root, "device_type", NULL);
+                if (model && !strncmp("chrp", model, 4))
+                        _machine = _MACH_chrp;
+                else {
+                        model = get_property(root, "model", NULL);
+                        if (model && !strncmp(model, "IBM", 3))
+                                _machine = _MACH_chrp;
+                }
+        }
+}
+#endif
+
+#ifdef CONFIG_PPC_MULTIPLATFORM
+/*
+ * The PPC_MULTIPLATFORM version of platform_init...
+ */
+void __init
+platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
+              unsigned long r6, unsigned long r7)
+{
+#ifdef CONFIG_BOOTX_TEXT
+        if (boot_text_mapped) {
+                btext_clearscreen();
+                btext_welcome();
+        }
+#endif
+
+        parse_bootinfo(find_bootinfo());
+
+        /* if we didn't get any bootinfo telling us what we are... */
+        if (_machine == 0) {
+                /* prep boot loader tells us if we're prep or not */
+                if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
+                        _machine = _MACH_prep;
+        }
+
+        /* not much more to do here, if prep */
+        if (_machine == _MACH_prep) {
+                prep_init(r3, r4, r5, r6, r7);
+                return;
+        }
+
+        /* prom_init has already been called from __start */
+        if (boot_infos)
+                relocate_nodes();
+
+        /* If we aren't PReP, we can find out if we're Pmac
+         * or CHRP with this. */
+        if (_machine == 0)
+                intuit_machine_type();
+
+        /* finish_device_tree may need _machine defined. */
+        finish_device_tree();
+
+        /*
+         * If we were booted via quik, r3 points to the physical
+         * address of the command-line parameters.
+         * If we were booted from an xcoff image (i.e. netbooted or
+         * booted from floppy), we get the command line from the
+         * bootargs property of the /chosen node.
+         * If an initial ramdisk is present, r3 and r4
+         * are used for initrd_start and initrd_size,
+         * otherwise they contain 0xdeadbeef.
+         */
+        if (r3 >= 0x4000 && r3 < 0x800000 && r4 == 0) {
+                strlcpy(cmd_line, (char *)r3 + KERNELBASE,
+                        sizeof(cmd_line));
+        } else if (boot_infos != 0) {
+                /* booted by BootX - check for ramdisk */
+                if (boot_infos->kernelParamsOffset != 0)
+                        strlcpy(cmd_line, (char *) boot_infos
+                                + boot_infos->kernelParamsOffset,
+                                sizeof(cmd_line));
+#ifdef CONFIG_BLK_DEV_INITRD
+                if (boot_infos->ramDisk) {
+                        initrd_start = (unsigned long) boot_infos
+                                + boot_infos->ramDisk;
+                        initrd_end = initrd_start + boot_infos->ramDiskSize;
+                        initrd_below_start_ok = 1;
+                }
+#endif
+        } else {
+                struct device_node *chosen;
+                char *p;
+        
+#ifdef CONFIG_BLK_DEV_INITRD
+                if (r3 && r4 && r4 != 0xdeadbeef) {
+                        if (r3 < KERNELBASE)
+                                r3 += KERNELBASE;
+                        initrd_start = r3;
+                        initrd_end = r3 + r4;
+                        ROOT_DEV = Root_RAM0;
+                        initrd_below_start_ok = 1;
+                }
+#endif
+                chosen = find_devices("chosen");
+                if (chosen != NULL) {
+                        p = get_property(chosen, "bootargs", NULL);
+                        if (p && *p) {
+                                strlcpy(cmd_line, p, sizeof(cmd_line));
+                        }
+                }
+        }
+#ifdef CONFIG_ADB
+        if (strstr(cmd_line, "adb_sync")) {
+                extern int __adb_probe_sync;
+                __adb_probe_sync = 1;
+        }
+#endif /* CONFIG_ADB */
+
+        switch (_machine) {
+        case _MACH_Pmac:
+                pmac_init(r3, r4, r5, r6, r7);
+                break;
+        case _MACH_chrp:
+                chrp_init(r3, r4, r5, r6, r7);
+                break;
+        }
+}
+
+#ifdef CONFIG_SERIAL_CORE_CONSOLE
+extern char *of_stdout_device;
+
+static int __init set_preferred_console(void)
+{
+        struct device_node *prom_stdout;
+        char *name;
+        int offset;
+
+        if (of_stdout_device == NULL)
+                return -ENODEV;
+
+        /* The user has requested a console so this is already set up. */
+        if (strstr(saved_command_line, "console="))
+                return -EBUSY;
+
+        prom_stdout = find_path_device(of_stdout_device);
+        if (!prom_stdout)
+                return -ENODEV;
+
+        name = (char *)get_property(prom_stdout, "name", NULL);
+        if (!name)
+                return -ENODEV;
+
+        if (strcmp(name, "serial") == 0) {
+                int i;
+                u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
+                if (i > 8) {
+                        switch (reg[1]) {
+                                case 0x3f8:
+                                        offset = 0;
+                                        break;
+                                case 0x2f8:
+                                        offset = 1;
+                                        break;
+                                case 0x898:
+                                        offset = 2;
+                                        break;
+                                case 0x890:
+                                        offset = 3;
+                                        break;
+                                default:
+                                        /* We dont recognise the serial port */
+                                        return -ENODEV;
+                        }
+                }
+        } else if (strcmp(name, "ch-a") == 0)
+                offset = 0;
+        else if (strcmp(name, "ch-b") == 0)
+                offset = 1;
+        else
+                return -ENODEV;
+        return add_preferred_console("ttyS", offset, NULL);
+}
+console_initcall(set_preferred_console);
+#endif /* CONFIG_SERIAL_CORE_CONSOLE */
+#endif /* CONFIG_PPC_MULTIPLATFORM */
+
+struct bi_record *find_bootinfo(void)
+{
+        struct bi_record *rec;
+
+        rec = (struct bi_record *)_ALIGN((ulong)__bss_start+(1<<20)-1,(1<<20));
+        if ( rec->tag != BI_FIRST ) {
+                /*
+                 * This 0x10000 offset is a terrible hack but it will go away when
+                 * we have the bootloader handle all the relocation and
+                 * prom calls -- Cort
+                 */
+                rec = (struct bi_record *)_ALIGN((ulong)__bss_start+0x10000+(1<<20)-1,(1<<20));
+                if ( rec->tag != BI_FIRST )
+                        return NULL;
+        }
+        return rec;
+}
+
+void parse_bootinfo(struct bi_record *rec)
+{
+        if (rec == NULL || rec->tag != BI_FIRST)
+                return;
+        while (rec->tag != BI_LAST) {
+                ulong *data = rec->data;
+                switch (rec->tag) {
+                case BI_CMD_LINE:
+                        strlcpy(cmd_line, (void *)data, sizeof(cmd_line));
+                        break;
+                case BI_SYSMAP:
+                        sysmap = (char *)((data[0] >= (KERNELBASE)) ? data[0] :
+                                          (data[0]+KERNELBASE));
+                        sysmap_size = data[1];
+                        break;
+#ifdef CONFIG_BLK_DEV_INITRD
+                case BI_INITRD:
+                        initrd_start = data[0] + KERNELBASE;
+                        initrd_end = data[0] + data[1] + KERNELBASE;
+                        break;
+#endif /* CONFIG_BLK_DEV_INITRD */
+#ifdef CONFIG_PPC_MULTIPLATFORM
+                case BI_MACHTYPE:
+                        _machine = data[0];
+                        break;
+#endif
+                case BI_MEMSIZE:
+                        boot_mem_size = data[0];
+                        break;
+                }
+                rec = (struct bi_record *)((ulong)rec + rec->size);
+        }
+}
+
+/*
+ * Find out what kind of machine we're on and save any data we need
+ * from the early boot process (devtree is copied on pmac by prom_init()).
+ * This is called very early on the boot process, after a minimal
+ * MMU environment has been set up but before MMU_init is called.
+ */
+void __init
+machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
+             unsigned long r6, unsigned long r7)
+{
+#ifdef CONFIG_CMDLINE
+        strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
+#endif /* CONFIG_CMDLINE */
+
+#ifdef CONFIG_6xx
+        ppc_md.power_save = ppc6xx_idle;
+#endif
+#ifdef CONFIG_POWER4
+        ppc_md.power_save = power4_idle;
+#endif
+
+        platform_init(r3, r4, r5, r6, r7);
+
+        if (ppc_md.progress)
+                ppc_md.progress("id mach(): done", 0x200);
+}
+
+/* Checks "l2cr=xxxx" command-line option */
+int __init ppc_setup_l2cr(char *str)
+{
+        if (cpu_has_feature(CPU_FTR_L2CR)) {
+                unsigned long val = simple_strtoul(str, NULL, 0);
+                printk(KERN_INFO "l2cr set to %lx\n", val);
+                _set_L2CR(0);           /* force invalidate by disable cache */
+                _set_L2CR(val);         /* and enable it */
+        }
+        return 1;
+}
+__setup("l2cr=", ppc_setup_l2cr);
+
+#ifdef CONFIG_GENERIC_NVRAM
+
+/* Generic nvram hooks used by drivers/char/gen_nvram.c */
+unsigned char nvram_read_byte(int addr)
+{
+        if (ppc_md.nvram_read_val)
+                return ppc_md.nvram_read_val(addr);
+        return 0xff;
+}
+EXPORT_SYMBOL(nvram_read_byte);
+
+void nvram_write_byte(unsigned char val, int addr)
+{
+        if (ppc_md.nvram_write_val)
+                ppc_md.nvram_write_val(addr, val);
+}
+EXPORT_SYMBOL(nvram_write_byte);
+
+void nvram_sync(void)
+{
+        if (ppc_md.nvram_sync)
+                ppc_md.nvram_sync();
+}
+EXPORT_SYMBOL(nvram_sync);
+
+#endif /* CONFIG_NVRAM */
+
+static struct cpu cpu_devices[NR_CPUS];
+
+int __init ppc_init(void)
+{
+        int i;
+
+        /* clear the progress line */
+        if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
+
+        /* register CPU devices */
+        for (i = 0; i < NR_CPUS; i++)
+                if (cpu_possible(i))
+                        register_cpu(&cpu_devices[i], i, NULL);
+
+        /* call platform init */
+        if (ppc_md.init != NULL) {
+                ppc_md.init();
+        }
+        return 0;
+}
+
+arch_initcall(ppc_init);
+
+/* Warning, IO base is not yet inited */
+void __init setup_arch(char **cmdline_p)
+{
+        extern char *klimit;
+        extern void do_init_bootmem(void);
+
+        /* so udelay does something sensible, assume <= 1000 bogomips */
+        loops_per_jiffy = 500000000 / HZ;
+
+#ifdef CONFIG_PPC_MULTIPLATFORM
+        /* This could be called "early setup arch", it must be done
+         * now because xmon need it
+         */
+        if (_machine == _MACH_Pmac)
+                pmac_feature_init();    /* New cool way */
+#endif
+
+#ifdef CONFIG_XMON
+        xmon_map_scc();
+        if (strstr(cmd_line, "xmon"))
+                xmon(NULL);
+#endif /* CONFIG_XMON */
+        if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
+
+#if defined(CONFIG_KGDB)
+        if (ppc_md.kgdb_map_scc)
+                ppc_md.kgdb_map_scc();
+        set_debug_traps();
+        if (strstr(cmd_line, "gdb")) {
+                if (ppc_md.progress)
+                        ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
+                printk("kgdb breakpoint activated\n");
+                breakpoint();
+        }
+#endif
+
+        /*
+         * Set cache line size based on type of cpu as a default.
+         * Systems with OF can look in the properties on the cpu node(s)
+         * for a possibly more accurate value.
+         */
+        if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
+                dcache_bsize = cur_cpu_spec[0]->dcache_bsize;
+                icache_bsize = cur_cpu_spec[0]->icache_bsize;
+                ucache_bsize = 0;
+        } else
+                ucache_bsize = dcache_bsize = icache_bsize
+                        = cur_cpu_spec[0]->dcache_bsize;
+
+        /* reboot on panic */
+        panic_timeout = 180;
+
+        init_mm.start_code = PAGE_OFFSET;
+        init_mm.end_code = (unsigned long) _etext;
+        init_mm.end_data = (unsigned long) _edata;
+        init_mm.brk = (unsigned long) klimit;
+
+        /* Save unparsed command line copy for /proc/cmdline */
+        strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
+        *cmdline_p = cmd_line;
+
+        /* set up the bootmem stuff with available memory */
+        do_init_bootmem();
+        if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
+
+#ifdef CONFIG_PPC_OCP
+        /* Initialize OCP device list */
+        ocp_early_init();
+        if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
+#endif
+
+#ifdef CONFIG_DUMMY_CONSOLE
+        conswitchp = &dummy_con;
+#endif
+
+        ppc_md.setup_arch();
+        if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
+
+        paging_init();
+
+        /* this is for modules since _machine can be a define -- Cort */
+        ppc_md.ppc_machine = _machine;
+}