Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1392 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/setup.c b/arch/ppc64/kernel/setup.c
new file mode 100644
index 000000000000..21c57f539c29
--- /dev/null
+++ b/arch/ppc64/kernel/setup.c
@@ -0,0 +1,1392 @@
+/*
+ * 
+ * Common boot and setup code.
+ *
+ * Copyright (C) 2001 PPC64 Team, IBM Corp
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#undef DEBUG
+
+#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/seq_file.h>
+#include <linux/ioport.h>
+#include <linux/console.h>
+#include <linux/version.h>
+#include <linux/tty.h>
+#include <linux/root_dev.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
+#include <linux/unistd.h>
+#include <linux/serial.h>
+#include <linux/serial_8250.h>
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/processor.h>
+#include <asm/pgtable.h>
+#include <asm/bootinfo.h>
+#include <asm/smp.h>
+#include <asm/elf.h>
+#include <asm/machdep.h>
+#include <asm/iSeries/LparData.h>
+#include <asm/paca.h>
+#include <asm/ppcdebug.h>
+#include <asm/time.h>
+#include <asm/cputable.h>
+#include <asm/sections.h>
+#include <asm/btext.h>
+#include <asm/nvram.h>
+#include <asm/setup.h>
+#include <asm/system.h>
+#include <asm/rtas.h>
+#include <asm/iommu.h>
+#include <asm/serial.h>
+#include <asm/cache.h>
+#include <asm/page.h>
+#include <asm/mmu.h>
+
+#ifdef DEBUG
+#define DBG(fmt...) udbg_printf(fmt)
+#else
+#define DBG(fmt...)
+#endif
+
+/*
+ * Here are some early debugging facilities. You can enable one
+ * but your kernel will not boot on anything else if you do so
+ */
+
+/* This one is for use on LPAR machines that support an HVC console
+ * on vterm 0
+ */
+extern void udbg_init_debug_lpar(void);
+/* This one is for use on Apple G5 machines
+ */
+extern void udbg_init_pmac_realmode(void);
+/* That's RTAS panel debug */
+extern void call_rtas_display_status_delay(unsigned char c);
+/* Here's maple real mode debug */
+extern void udbg_init_maple_realmode(void);
+
+#define EARLY_DEBUG_INIT() do {} while(0)
+
+#if 0
+#define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
+#define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
+#define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
+#define EARLY_DEBUG_INIT()                                              \
+        do { ppc_md.udbg_putc = call_rtas_display_status_delay; } while(0)
+#endif
+
+/* extern void *stab; */
+extern unsigned long klimit;
+
+extern void mm_init_ppc64(void);
+extern int  idle_setup(void);
+extern void stab_initialize(unsigned long stab);
+extern void htab_initialize(void);
+extern void early_init_devtree(void *flat_dt);
+extern void unflatten_device_tree(void);
+
+extern void smp_release_cpus(void);
+
+unsigned long decr_overclock = 1;
+unsigned long decr_overclock_proc0 = 1;
+unsigned long decr_overclock_set = 0;
+unsigned long decr_overclock_proc0_set = 0;
+
+int have_of = 1;
+int boot_cpuid = 0;
+int boot_cpuid_phys = 0;
+dev_t boot_dev;
+u64 ppc64_pft_size;
+u64 ppc64_debug_switch;
+
+struct ppc64_caches ppc64_caches;
+EXPORT_SYMBOL_GPL(ppc64_caches);
+
+/*
+ * 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;
+
+/* The main machine-dep calls structure
+ */
+struct machdep_calls ppc_md;
+EXPORT_SYMBOL(ppc_md);
+
+#ifdef CONFIG_MAGIC_SYSRQ
+unsigned long SYSRQ_KEY;
+#endif /* CONFIG_MAGIC_SYSRQ */
+
+
+static int ppc64_panic_event(struct notifier_block *, unsigned long, void *);
+static struct notifier_block ppc64_panic_block = {
+        .notifier_call = ppc64_panic_event,
+        .priority = INT_MIN /* may not return; must be done last */
+};
+
+/*
+ * Perhaps we can put the pmac screen_info[] here
+ * on pmac as well so we don't need the ifdef's.
+ * Until we get multiple-console support in here
+ * that is.  -- Cort
+ * Maybe tie it to serial consoles, since this is really what
+ * these processors use on existing boards.  -- Dan
+ */ 
+struct screen_info screen_info = {
+        .orig_x = 0,
+        .orig_y = 25,
+        .orig_video_cols = 80,
+        .orig_video_lines = 25,
+        .orig_video_isVGA = 1,
+        .orig_video_points = 16
+};
+
+/*
+ * Initialize the PPCDBG state.  Called before relocation has been enabled.
+ */
+void __init ppcdbg_initialize(void)
+{
+        ppc64_debug_switch = PPC_DEBUG_DEFAULT; /* | PPCDBG_BUSWALK | */
+        /* PPCDBG_PHBINIT | PPCDBG_MM | PPCDBG_MMINIT | PPCDBG_TCEINIT | PPCDBG_TCE */;
+}
+
+/*
+ * Early boot console based on udbg
+ */
+static struct console udbg_console = {
+        .name   = "udbg",
+        .write  = udbg_console_write,
+        .flags  = CON_PRINTBUFFER,
+        .index  = -1,
+};
+static int early_console_initialized;
+
+void __init disable_early_printk(void)
+{
+        if (!early_console_initialized)
+                return;
+        unregister_console(&udbg_console);
+        early_console_initialized = 0;
+}
+
+#if defined(CONFIG_PPC_MULTIPLATFORM) && defined(CONFIG_SMP)
+
+static int smt_enabled_cmdline;
+
+/* Look for ibm,smt-enabled OF option */
+static void check_smt_enabled(void)
+{
+        struct device_node *dn;
+        char *smt_option;
+
+        /* Allow the command line to overrule the OF option */
+        if (smt_enabled_cmdline)
+                return;
+
+        dn = of_find_node_by_path("/options");
+
+        if (dn) {
+                smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL);
+
+                if (smt_option) {
+                        if (!strcmp(smt_option, "on"))
+                                smt_enabled_at_boot = 1;
+                        else if (!strcmp(smt_option, "off"))
+                                smt_enabled_at_boot = 0;
+                }
+        }
+}
+
+/* Look for smt-enabled= cmdline option */
+static int __init early_smt_enabled(char *p)
+{
+        smt_enabled_cmdline = 1;
+
+        if (!p)
+                return 0;
+
+        if (!strcmp(p, "on") || !strcmp(p, "1"))
+                smt_enabled_at_boot = 1;
+        else if (!strcmp(p, "off") || !strcmp(p, "0"))
+                smt_enabled_at_boot = 0;
+
+        return 0;
+}
+early_param("smt-enabled", early_smt_enabled);
+
+/**
+ * setup_cpu_maps - initialize the following cpu maps:
+ *                  cpu_possible_map
+ *                  cpu_present_map
+ *                  cpu_sibling_map
+ *
+ * Having the possible map set up early allows us to restrict allocations
+ * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
+ *
+ * We do not initialize the online map here; cpus set their own bits in
+ * cpu_online_map as they come up.
+ *
+ * This function is valid only for Open Firmware systems.  finish_device_tree
+ * must be called before using this.
+ *
+ * While we're here, we may as well set the "physical" cpu ids in the paca.
+ */
+static void __init setup_cpu_maps(void)
+{
+        struct device_node *dn = NULL;
+        int cpu = 0;
+        int swap_cpuid = 0;
+
+        check_smt_enabled();
+
+        while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
+                u32 *intserv;
+                int j, len = sizeof(u32), nthreads;
+
+                intserv = (u32 *)get_property(dn, "ibm,ppc-interrupt-server#s",
+                                              &len);
+                if (!intserv)
+                        intserv = (u32 *)get_property(dn, "reg", NULL);
+
+                nthreads = len / sizeof(u32);
+
+                for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
+                        cpu_set(cpu, cpu_present_map);
+                        set_hard_smp_processor_id(cpu, intserv[j]);
+
+                        if (intserv[j] == boot_cpuid_phys)
+                                swap_cpuid = cpu;
+                        cpu_set(cpu, cpu_possible_map);
+                        cpu++;
+                }
+        }
+
+        /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
+         * boot cpu is logical 0.
+         */
+        if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
+                u32 tmp;
+                tmp = get_hard_smp_processor_id(0);
+                set_hard_smp_processor_id(0, boot_cpuid_phys);
+                set_hard_smp_processor_id(swap_cpuid, tmp);
+        }
+
+        /*
+         * On pSeries LPAR, we need to know how many cpus
+         * could possibly be added to this partition.
+         */
+        if (systemcfg->platform == PLATFORM_PSERIES_LPAR &&
+                                (dn = of_find_node_by_path("/rtas"))) {
+                int num_addr_cell, num_size_cell, maxcpus;
+                unsigned int *ireg;
+
+                num_addr_cell = prom_n_addr_cells(dn);
+                num_size_cell = prom_n_size_cells(dn);
+
+                ireg = (unsigned int *)
+                        get_property(dn, "ibm,lrdr-capacity", NULL);
+
+                if (!ireg)
+                        goto out;
+
+                maxcpus = ireg[num_addr_cell + num_size_cell];
+
+                /* Double maxcpus for processors which have SMT capability */
+                if (cpu_has_feature(CPU_FTR_SMT))
+                        maxcpus *= 2;
+
+                if (maxcpus > NR_CPUS) {
+                        printk(KERN_WARNING
+                               "Partition configured for %d cpus, "
+                               "operating system maximum is %d.\n",
+                               maxcpus, NR_CPUS);
+                        maxcpus = NR_CPUS;
+                } else
+                        printk(KERN_INFO "Partition configured for %d cpus.\n",
+                               maxcpus);
+
+                for (cpu = 0; cpu < maxcpus; cpu++)
+                        cpu_set(cpu, cpu_possible_map);
+        out:
+                of_node_put(dn);
+        }
+
+        /*
+         * Do the sibling map; assume only two threads per processor.
+         */
+        for_each_cpu(cpu) {
+                cpu_set(cpu, cpu_sibling_map[cpu]);
+                if (cpu_has_feature(CPU_FTR_SMT))
+                        cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
+        }
+
+        systemcfg->processorCount = num_present_cpus();
+}
+#endif /* defined(CONFIG_PPC_MULTIPLATFORM) && defined(CONFIG_SMP) */
+
+
+#ifdef CONFIG_PPC_MULTIPLATFORM
+
+extern struct machdep_calls pSeries_md;
+extern struct machdep_calls pmac_md;
+extern struct machdep_calls maple_md;
+
+/* Ultimately, stuff them in an elf section like initcalls... */
+static struct machdep_calls __initdata *machines[] = {
+#ifdef CONFIG_PPC_PSERIES
+        &pSeries_md,
+#endif /* CONFIG_PPC_PSERIES */
+#ifdef CONFIG_PPC_PMAC
+        &pmac_md,
+#endif /* CONFIG_PPC_PMAC */
+#ifdef CONFIG_PPC_MAPLE
+        &maple_md,
+#endif /* CONFIG_PPC_MAPLE */
+        NULL
+};
+
+/*
+ * Early initialization entry point. This is called by head.S
+ * with MMU translation disabled. We rely on the "feature" of
+ * the CPU that ignores the top 2 bits of the address in real
+ * mode so we can access kernel globals normally provided we
+ * only toy with things in the RMO region. From here, we do
+ * some early parsing of the device-tree to setup out LMB
+ * data structures, and allocate & initialize the hash table
+ * and segment tables so we can start running with translation
+ * enabled.
+ *
+ * It is this function which will call the probe() callback of
+ * the various platform types and copy the matching one to the
+ * global ppc_md structure. Your platform can eventually do
+ * some very early initializations from the probe() routine, but
+ * this is not recommended, be very careful as, for example, the
+ * device-tree is not accessible via normal means at this point.
+ */
+
+void __init early_setup(unsigned long dt_ptr)
+{
+        struct paca_struct *lpaca = get_paca();
+        static struct machdep_calls **mach;
+
+        /*
+         * Enable early debugging if any specified (see top of
+         * this file)
+         */
+        EARLY_DEBUG_INIT();
+
+        DBG(" -> early_setup()\n");
+
+        /*
+         * Fill the default DBG level (do we want to keep
+         * that old mecanism around forever ?)
+         */
+        ppcdbg_initialize();
+
+        /*
+         * Do early initializations using the flattened device
+         * tree, like retreiving the physical memory map or
+         * calculating/retreiving the hash table size
+         */
+        early_init_devtree(__va(dt_ptr));
+
+        /*
+         * Iterate all ppc_md structures until we find the proper
+         * one for the current machine type
+         */
+        DBG("Probing machine type for platform %x...\n",
+            systemcfg->platform);
+
+        for (mach = machines; *mach; mach++) {
+                if ((*mach)->probe(systemcfg->platform))
+                        break;
+        }
+        /* What can we do if we didn't find ? */
+        if (*mach == NULL) {
+                DBG("No suitable machine found !\n");
+                for (;;);
+        }
+        ppc_md = **mach;
+
+        /* our udbg callbacks got overriden by the above, let's put them
+         * back in. Ultimately, I want those things to be split from the
+         * main ppc_md
+         */
+        EARLY_DEBUG_INIT();
+
+        DBG("Found, Initializing memory management...\n");
+
+        /*
+         * Initialize stab / SLB management
+         */
+        stab_initialize(lpaca->stab_real);
+
+        /*
+         * Initialize the MMU Hash table and create the linear mapping
+         * of memory
+         */
+        htab_initialize();
+
+        DBG(" <- early_setup()\n");
+}
+
+
+/*
+ * Initialize some remaining members of the ppc64_caches and systemcfg structures
+ * (at least until we get rid of them completely). This is mostly some
+ * cache informations about the CPU that will be used by cache flush
+ * routines and/or provided to userland
+ */
+static void __init initialize_cache_info(void)
+{
+        struct device_node *np;
+        unsigned long num_cpus = 0;
+
+        DBG(" -> initialize_cache_info()\n");
+
+        for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
+                num_cpus += 1;
+
+                /* We're assuming *all* of the CPUs have the same
+                 * d-cache and i-cache sizes... -Peter
+                 */
+
+                if ( num_cpus == 1 ) {
+                        u32 *sizep, *lsizep;
+                        u32 size, lsize;
+                        const char *dc, *ic;
+
+                        /* Then read cache informations */
+                        if (systemcfg->platform == PLATFORM_POWERMAC) {
+                                dc = "d-cache-block-size";
+                                ic = "i-cache-block-size";
+                        } else {
+                                dc = "d-cache-line-size";
+                                ic = "i-cache-line-size";
+                        }
+
+                        size = 0;
+                        lsize = cur_cpu_spec->dcache_bsize;
+                        sizep = (u32 *)get_property(np, "d-cache-size", NULL);
+                        if (sizep != NULL)
+                                size = *sizep;
+                        lsizep = (u32 *) get_property(np, dc, NULL);
+                        if (lsizep != NULL)
+                                lsize = *lsizep;
+                        if (sizep == 0 || lsizep == 0)
+                                DBG("Argh, can't find dcache properties ! "
+                                    "sizep: %p, lsizep: %p\n", sizep, lsizep);
+
+                        systemcfg->dcache_size = ppc64_caches.dsize = size;
+                        systemcfg->dcache_line_size =
+                                ppc64_caches.dline_size = lsize;
+                        ppc64_caches.log_dline_size = __ilog2(lsize);
+                        ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
+
+                        size = 0;
+                        lsize = cur_cpu_spec->icache_bsize;
+                        sizep = (u32 *)get_property(np, "i-cache-size", NULL);
+                        if (sizep != NULL)
+                                size = *sizep;
+                        lsizep = (u32 *)get_property(np, ic, NULL);
+                        if (lsizep != NULL)
+                                lsize = *lsizep;
+                        if (sizep == 0 || lsizep == 0)
+                                DBG("Argh, can't find icache properties ! "
+                                    "sizep: %p, lsizep: %p\n", sizep, lsizep);
+
+                        systemcfg->icache_size = ppc64_caches.isize = size;
+                        systemcfg->icache_line_size =
+                                ppc64_caches.iline_size = lsize;
+                        ppc64_caches.log_iline_size = __ilog2(lsize);
+                        ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
+                }
+        }
+
+        /* Add an eye catcher and the systemcfg layout version number */
+        strcpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64");
+        systemcfg->version.major = SYSTEMCFG_MAJOR;
+        systemcfg->version.minor = SYSTEMCFG_MINOR;
+        systemcfg->processor = mfspr(SPRN_PVR);
+
+        DBG(" <- initialize_cache_info()\n");
+}
+
+static void __init check_for_initrd(void)
+{
+#ifdef CONFIG_BLK_DEV_INITRD
+        u64 *prop;
+
+        DBG(" -> check_for_initrd()\n");
+
+        prop = (u64 *)get_property(of_chosen, "linux,initrd-start", NULL);
+        if (prop != NULL) {
+                initrd_start = (unsigned long)__va(*prop);
+                prop = (u64 *)get_property(of_chosen, "linux,initrd-end", NULL);
+                if (prop != NULL) {
+                        initrd_end = (unsigned long)__va(*prop);
+                        initrd_below_start_ok = 1;
+                } else
+                        initrd_start = 0;
+        }
+
+        /* If we were passed an initrd, set the ROOT_DEV properly if the values
+         * look sensible. If not, clear initrd reference.
+         */
+        if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
+            initrd_end > initrd_start)
+                ROOT_DEV = Root_RAM0;
+        else
+                initrd_start = initrd_end = 0;
+
+        if (initrd_start)
+                printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
+
+        DBG(" <- check_for_initrd()\n");
+#endif /* CONFIG_BLK_DEV_INITRD */
+}
+
+#endif /* CONFIG_PPC_MULTIPLATFORM */
+
+/*
+ * Do some initial setup of the system.  The parameters are those which 
+ * were passed in from the bootloader.
+ */
+void __init setup_system(void)
+{
+        DBG(" -> setup_system()\n");
+
+#ifdef CONFIG_PPC_ISERIES
+        /* pSeries systems are identified in prom.c via OF. */
+        if (itLpNaca.xLparInstalled == 1)
+                systemcfg->platform = PLATFORM_ISERIES_LPAR;
+
+        ppc_md.init_early();
+#else /* CONFIG_PPC_ISERIES */
+
+        /*
+         * Unflatten the device-tree passed by prom_init or kexec
+         */
+        unflatten_device_tree();
+
+        /*
+         * Fill the ppc64_caches & systemcfg structures with informations
+         * retreived from the device-tree. Need to be called before
+         * finish_device_tree() since the later requires some of the
+         * informations filled up here to properly parse the interrupt
+         * tree.
+         * It also sets up the cache line sizes which allows to call
+         * routines like flush_icache_range (used by the hash init
+         * later on).
+         */
+        initialize_cache_info();
+
+#ifdef CONFIG_PPC_RTAS
+        /*
+         * Initialize RTAS if available
+         */
+        rtas_initialize();
+#endif /* CONFIG_PPC_RTAS */
+
+        /*
+         * Check if we have an initrd provided via the device-tree
+         */
+        check_for_initrd();
+
+        /*
+         * Do some platform specific early initializations, that includes
+         * setting up the hash table pointers. It also sets up some interrupt-mapping
+         * related options that will be used by finish_device_tree()
+         */
+        ppc_md.init_early();
+
+        /*
+         * "Finish" the device-tree, that is do the actual parsing of
+         * some of the properties like the interrupt map
+         */
+        finish_device_tree();
+
+        /*
+         * Initialize xmon
+         */
+#ifdef CONFIG_XMON_DEFAULT
+        xmon_init();
+#endif
+        /*
+         * Register early console
+         */
+        early_console_initialized = 1;
+        register_console(&udbg_console);
+
+        /* Save unparsed command line copy for /proc/cmdline */
+        strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
+
+        parse_early_param();
+#endif /* !CONFIG_PPC_ISERIES */
+
+#if defined(CONFIG_SMP) && !defined(CONFIG_PPC_ISERIES)
+        /*
+         * iSeries has already initialized the cpu maps at this point.
+         */
+        setup_cpu_maps();
+
+        /* Release secondary cpus out of their spinloops at 0x60 now that
+         * we can map physical -> logical CPU ids
+         */
+        smp_release_cpus();
+#endif /* defined(CONFIG_SMP) && !defined(CONFIG_PPC_ISERIES) */
+
+        printk("Starting Linux PPC64 %s\n", UTS_RELEASE);
+
+        printk("-----------------------------------------------------\n");
+        printk("ppc64_pft_size                = 0x%lx\n", ppc64_pft_size);
+        printk("ppc64_debug_switch            = 0x%lx\n", ppc64_debug_switch);
+        printk("ppc64_interrupt_controller    = 0x%ld\n", ppc64_interrupt_controller);
+        printk("systemcfg                     = 0x%p\n", systemcfg);
+        printk("systemcfg->platform           = 0x%x\n", systemcfg->platform);
+        printk("systemcfg->processorCount     = 0x%lx\n", systemcfg->processorCount);
+        printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg->physicalMemorySize);
+        printk("ppc64_caches.dcache_line_size = 0x%x\n",
+                        ppc64_caches.dline_size);
+        printk("ppc64_caches.icache_line_size = 0x%x\n",
+                        ppc64_caches.iline_size);
+        printk("htab_address                  = 0x%p\n", htab_address);
+        printk("htab_hash_mask                = 0x%lx\n", htab_hash_mask);
+        printk("-----------------------------------------------------\n");
+
+        mm_init_ppc64();
+
+        DBG(" <- setup_system()\n");
+}
+
+
+void machine_restart(char *cmd)
+{
+        if (ppc_md.nvram_sync)
+                ppc_md.nvram_sync();
+        ppc_md.restart(cmd);
+}
+
+EXPORT_SYMBOL(machine_restart);
+  
+void machine_power_off(void)
+{
+        if (ppc_md.nvram_sync)
+                ppc_md.nvram_sync();
+        ppc_md.power_off();
+}
+
+EXPORT_SYMBOL(machine_power_off);
+  
+void machine_halt(void)
+{
+        if (ppc_md.nvram_sync)
+                ppc_md.nvram_sync();
+        ppc_md.halt();
+}
+
+EXPORT_SYMBOL(machine_halt);
+
+unsigned long ppc_proc_freq;
+unsigned long ppc_tb_freq;
+
+static int ppc64_panic_event(struct notifier_block *this,
+                             unsigned long event, void *ptr)
+{
+        ppc_md.panic((char *)ptr);  /* May not return */
+        return NOTIFY_DONE;
+}
+
+
+#ifdef CONFIG_SMP
+DEFINE_PER_CPU(unsigned int, pvr);
+#endif
+
+static int show_cpuinfo(struct seq_file *m, void *v)
+{
+        unsigned long cpu_id = (unsigned long)v - 1;
+        unsigned int pvr;
+        unsigned short maj;
+        unsigned short min;
+
+        if (cpu_id == NR_CPUS) {
+                seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
+
+                if (ppc_md.get_cpuinfo != NULL)
+                        ppc_md.get_cpuinfo(m);
+
+                return 0;
+        }
+
+        /* We only show online cpus: disable preempt (overzealous, I
+         * knew) to prevent cpu going down. */
+        preempt_disable();
+        if (!cpu_online(cpu_id)) {
+                preempt_enable();
+                return 0;
+        }
+
+#ifdef CONFIG_SMP
+        pvr = per_cpu(pvr, cpu_id);
+#else
+        pvr = mfspr(SPRN_PVR);
+#endif
+        maj = (pvr >> 8) & 0xFF;
+        min = pvr & 0xFF;
+
+        seq_printf(m, "processor\t: %lu\n", cpu_id);
+        seq_printf(m, "cpu\t\t: ");
+
+        if (cur_cpu_spec->pvr_mask)
+                seq_printf(m, "%s", cur_cpu_spec->cpu_name);
+        else
+                seq_printf(m, "unknown (%08x)", pvr);
+
+#ifdef CONFIG_ALTIVEC
+        if (cpu_has_feature(CPU_FTR_ALTIVEC))
+                seq_printf(m, ", altivec supported");
+#endif /* CONFIG_ALTIVEC */
+
+        seq_printf(m, "\n");
+
+        /*
+         * Assume here that all clock rates are the same in a
+         * smp system.  -- Cort
+         */
+        seq_printf(m, "clock\t\t: %lu.%06luMHz\n", ppc_proc_freq / 1000000,
+                   ppc_proc_freq % 1000000);
+
+        seq_printf(m, "revision\t: %hd.%hd\n\n", maj, min);
+
+        preempt_enable();
+        return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+        return *pos <= NR_CPUS ? (void *)((*pos)+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,
+};
+
+/*
+ * These three variables are used to save values passed to us by prom_init()
+ * via the device tree. The TCE variables are needed because with a memory_limit
+ * in force we may need to explicitly map the TCE are at the top of RAM.
+ */
+unsigned long memory_limit;
+unsigned long tce_alloc_start;
+unsigned long tce_alloc_end;
+
+#ifdef CONFIG_PPC_ISERIES
+/*
+ * On iSeries we just parse the mem=X option from the command line.
+ * On pSeries it's a bit more complicated, see prom_init_mem()
+ */
+static int __init early_parsemem(char *p)
+{
+        if (!p)
+                return 0;
+
+        memory_limit = ALIGN(memparse(p, &p), PAGE_SIZE);
+
+        return 0;
+}
+early_param("mem", early_parsemem);
+#endif /* CONFIG_PPC_ISERIES */
+
+#ifdef CONFIG_PPC_MULTIPLATFORM
+static int __init set_preferred_console(void)
+{
+        struct device_node *prom_stdout = NULL;
+        char *name;
+        u32 *spd;
+        int offset = 0;
+
+        DBG(" -> set_preferred_console()\n");
+
+        /* The user has requested a console so this is already set up. */
+        if (strstr(saved_command_line, "console=")) {
+                DBG(" console was specified !\n");
+                return -EBUSY;
+        }
+
+        if (!of_chosen) {
+                DBG(" of_chosen is NULL !\n");
+                return -ENODEV;
+        }
+        /* We are getting a weird phandle from OF ... */
+        /* ... So use the full path instead */
+        name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
+        if (name == NULL) {
+                DBG(" no linux,stdout-path !\n");
+                return -ENODEV;
+        }
+        prom_stdout = of_find_node_by_path(name);
+        if (!prom_stdout) {
+                DBG(" can't find stdout package %s !\n", name);
+                return -ENODEV;
+        }       
+        DBG("stdout is %s\n", prom_stdout->full_name);
+
+        name = (char *)get_property(prom_stdout, "name", NULL);
+        if (!name) {
+                DBG(" stdout package has no name !\n");
+                goto not_found;
+        }
+        spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
+
+        if (0)
+                ;
+#ifdef CONFIG_SERIAL_8250_CONSOLE
+        else 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 */
+                                        goto not_found;
+                        }
+                }
+        }
+#endif /* CONFIG_SERIAL_8250_CONSOLE */
+#ifdef CONFIG_PPC_PSERIES
+        else if (strcmp(name, "vty") == 0) {
+                u32 *reg = (u32 *)get_property(prom_stdout, "reg", NULL);
+                char *compat = (char *)get_property(prom_stdout, "compatible", NULL);
+
+                if (reg && compat && (strcmp(compat, "hvterm-protocol") == 0)) {
+                        /* Host Virtual Serial Interface */
+                        int offset;
+                        switch (reg[0]) {
+                                case 0x30000000:
+                                        offset = 0;
+                                        break;
+                                case 0x30000001:
+                                        offset = 1;
+                                        break;
+                                default:
+                                        goto not_found;
+                        }
+                        of_node_put(prom_stdout);
+                        DBG("Found hvsi console at offset %d\n", offset);
+                        return add_preferred_console("hvsi", offset, NULL);
+                } else {
+                        /* pSeries LPAR virtual console */
+                        of_node_put(prom_stdout);
+                        DBG("Found hvc console\n");
+                        return add_preferred_console("hvc", 0, NULL);
+                }
+        }
+#endif /* CONFIG_PPC_PSERIES */
+#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
+        else if (strcmp(name, "ch-a") == 0)
+                offset = 0;
+        else if (strcmp(name, "ch-b") == 0)
+                offset = 1;
+#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
+        else
+                goto not_found;
+        of_node_put(prom_stdout);
+
+        DBG("Found serial console at ttyS%d\n", offset);
+
+        if (spd) {
+                static char __initdata opt[16];
+                sprintf(opt, "%d", *spd);
+                return add_preferred_console("ttyS", offset, opt);
+        } else
+                return add_preferred_console("ttyS", offset, NULL);
+
+ not_found:
+        DBG("No preferred console found !\n");
+        of_node_put(prom_stdout);
+        return -ENODEV;
+}
+console_initcall(set_preferred_console);
+#endif /* CONFIG_PPC_MULTIPLATFORM */
+
+#ifdef CONFIG_IRQSTACKS
+static void __init irqstack_early_init(void)
+{
+        unsigned int i;
+
+        /*
+         * interrupt stacks must be under 256MB, we cannot afford to take
+         * SLB misses on them.
+         */
+        for_each_cpu(i) {
+                softirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
+                                        THREAD_SIZE, 0x10000000));
+                hardirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
+                                        THREAD_SIZE, 0x10000000));
+        }
+}
+#else
+#define irqstack_early_init()
+#endif
+
+/*
+ * Stack space used when we detect a bad kernel stack pointer, and
+ * early in SMP boots before relocation is enabled.
+ */
+static void __init emergency_stack_init(void)
+{
+        unsigned long limit;
+        unsigned int i;
+
+        /*
+         * Emergency stacks must be under 256MB, we cannot afford to take
+         * SLB misses on them. The ABI also requires them to be 128-byte
+         * aligned.
+         *
+         * Since we use these as temporary stacks during secondary CPU
+         * bringup, we need to get at them in real mode. This means they
+         * must also be within the RMO region.
+         */
+        limit = min(0x10000000UL, lmb.rmo_size);
+
+        for_each_cpu(i)
+                paca[i].emergency_sp = __va(lmb_alloc_base(PAGE_SIZE, 128,
+                                                limit)) + PAGE_SIZE;
+}
+
+/*
+ * Called from setup_arch to initialize the bitmap of available
+ * syscalls in the systemcfg page
+ */
+void __init setup_syscall_map(void)
+{
+        unsigned int i, count64 = 0, count32 = 0;
+        extern unsigned long *sys_call_table;
+        extern unsigned long *sys_call_table32;
+        extern unsigned long sys_ni_syscall;
+
+
+        for (i = 0; i < __NR_syscalls; i++) {
+                if (sys_call_table[i] == sys_ni_syscall)
+                        continue;
+                count64++;
+                systemcfg->syscall_map_64[i >> 5] |= 0x80000000UL >> (i & 0x1f);
+        }
+        for (i = 0; i < __NR_syscalls; i++) {
+                if (sys_call_table32[i] == sys_ni_syscall)
+                        continue;
+                count32++;
+                systemcfg->syscall_map_32[i >> 5] |= 0x80000000UL >> (i & 0x1f);
+        }
+        printk(KERN_INFO "Syscall map setup, %d 32 bits and %d 64 bits syscalls\n",
+               count32, count64);
+}
+
+/*
+ * Called into from start_kernel, after lock_kernel has been called.
+ * Initializes bootmem, which is unsed to manage page allocation until
+ * mem_init is called.
+ */
+void __init setup_arch(char **cmdline_p)
+{
+        extern void do_init_bootmem(void);
+
+        ppc64_boot_msg(0x12, "Setup Arch");
+
+        *cmdline_p = cmd_line;
+
+        /*
+         * 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.
+         */
+        dcache_bsize = ppc64_caches.dline_size;
+        icache_bsize = ppc64_caches.iline_size;
+
+        /* reboot on panic */
+        panic_timeout = 180;
+
+        if (ppc_md.panic)
+                notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
+
+        init_mm.start_code = PAGE_OFFSET;
+        init_mm.end_code = (unsigned long) _etext;
+        init_mm.end_data = (unsigned long) _edata;
+        init_mm.brk = klimit;
+        
+        irqstack_early_init();
+        emergency_stack_init();
+
+        /* set up the bootmem stuff with available memory */
+        do_init_bootmem();
+
+        /* initialize the syscall map in systemcfg */
+        setup_syscall_map();
+
+        ppc_md.setup_arch();
+
+        /* Select the correct idle loop for the platform. */
+        idle_setup();
+
+        paging_init();
+        ppc64_boot_msg(0x15, "Setup Done");
+}
+
+
+/* ToDo: do something useful if ppc_md is not yet setup. */
+#define PPC64_LINUX_FUNCTION 0x0f000000
+#define PPC64_IPL_MESSAGE 0xc0000000
+#define PPC64_TERM_MESSAGE 0xb0000000
+#define PPC64_ATTN_MESSAGE 0xa0000000
+#define PPC64_DUMP_MESSAGE 0xd0000000
+
+static void ppc64_do_msg(unsigned int src, const char *msg)
+{
+        if (ppc_md.progress) {
+                char buf[32];
+
+                sprintf(buf, "%08x        \n", src);
+                ppc_md.progress(buf, 0);
+                sprintf(buf, "%-16s", msg);
+                ppc_md.progress(buf, 0);
+        }
+}
+
+/* Print a boot progress message. */
+void ppc64_boot_msg(unsigned int src, const char *msg)
+{
+        ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
+        printk("[boot]%04x %s\n", src, msg);
+}
+
+/* Print a termination message (print only -- does not stop the kernel) */
+void ppc64_terminate_msg(unsigned int src, const char *msg)
+{
+        ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
+        printk("[terminate]%04x %s\n", src, msg);
+}
+
+/* Print something that needs attention (device error, etc) */
+void ppc64_attention_msg(unsigned int src, const char *msg)
+{
+        ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_ATTN_MESSAGE|src, msg);
+        printk("[attention]%04x %s\n", src, msg);
+}
+
+/* Print a dump progress message. */
+void ppc64_dump_msg(unsigned int src, const char *msg)
+{
+        ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_DUMP_MESSAGE|src, msg);
+        printk("[dump]%04x %s\n", src, msg);
+}
+
+int set_spread_lpevents( char * str )
+{
+        /* The parameter is the number of processors to share in processing lp events */
+        unsigned long i;
+        unsigned long val = simple_strtoul( str, NULL, 0 );
+        if ( ( val > 0 ) && ( val <= NR_CPUS ) ) {
+                for ( i=1; i<val; ++i )
+                        paca[i].lpqueue_ptr = paca[0].lpqueue_ptr;
+                printk("lpevent processing spread over %ld processors\n", val);
+        }
+        else
+                printk("invalid spreaqd_lpevents %ld\n", val);
+        return 1;
+}       
+
+/* This should only be called on processor 0 during calibrate decr */
+void setup_default_decr(void)
+{
+        struct paca_struct *lpaca = get_paca();
+
+        if ( decr_overclock_set && !decr_overclock_proc0_set )
+                decr_overclock_proc0 = decr_overclock;
+
+        lpaca->default_decr = tb_ticks_per_jiffy / decr_overclock_proc0;        
+        lpaca->next_jiffy_update_tb = get_tb() + tb_ticks_per_jiffy;
+}
+
+int set_decr_overclock_proc0( char * str )
+{
+        unsigned long val = simple_strtoul( str, NULL, 0 );
+        if ( ( val >= 1 ) && ( val <= 48 ) ) {
+                decr_overclock_proc0_set = 1;
+                decr_overclock_proc0 = val;
+                printk("proc 0 decrementer overclock factor of %ld\n", val);
+        }
+        else
+                printk("invalid proc 0 decrementer overclock factor of %ld\n", val);
+        return 1;
+}
+
+int set_decr_overclock( char * str )
+{
+        unsigned long val = simple_strtoul( str, NULL, 0 );
+        if ( ( val >= 1 ) && ( val <= 48 ) ) {
+                decr_overclock_set = 1;
+                decr_overclock = val;
+                printk("decrementer overclock factor of %ld\n", val);
+        }
+        else
+                printk("invalid decrementer overclock factor of %ld\n", val);
+        return 1;
+
+}
+
+__setup("spread_lpevents=", set_spread_lpevents );
+__setup("decr_overclock_proc0=", set_decr_overclock_proc0 );
+__setup("decr_overclock=", set_decr_overclock );
+
+#ifndef CONFIG_PPC_ISERIES
+/*
+ * This function can be used by platforms to "find" legacy serial ports.
+ * It works for "serial" nodes under an "isa" node, and will try to
+ * respect the "ibm,aix-loc" property if any. It works with up to 8
+ * ports.
+ */
+
+#define MAX_LEGACY_SERIAL_PORTS 8
+static struct plat_serial8250_port serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
+static unsigned int old_serial_count;
+
+void __init generic_find_legacy_serial_ports(u64 *physport,
+                unsigned int *default_speed)
+{
+        struct device_node *np;
+        u32 *sizeprop;
+
+        struct isa_reg_property {
+                u32 space;
+                u32 address;
+                u32 size;
+        };
+        struct pci_reg_property {
+                struct pci_address addr;
+                u32 size_hi;
+                u32 size_lo;
+        };                                                                        
+
+        DBG(" -> generic_find_legacy_serial_port()\n");
+
+        *physport = 0;
+        if (default_speed)
+                *default_speed = 0;
+
+        np = of_find_node_by_path("/");
+        if (!np)
+                return;
+
+        /* First fill our array */
+        for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
+                struct device_node *isa, *pci;
+                struct isa_reg_property *reg;
+                unsigned long phys_size, addr_size, io_base;
+                u32 *rangesp;
+                u32 *interrupts, *clk, *spd;
+                char *typep;
+                int index, rlen, rentsize;
+
+                /* Ok, first check if it's under an "isa" parent */
+                isa = of_get_parent(np);
+                if (!isa || strcmp(isa->name, "isa")) {
+                        DBG("%s: no isa parent found\n", np->full_name);
+                        continue;
+                }
+                
+                /* Now look for an "ibm,aix-loc" property that gives us ordering
+                 * if any...
+                 */
+                typep = (char *)get_property(np, "ibm,aix-loc", NULL);
+
+                /* Get the ISA port number */
+                reg = (struct isa_reg_property *)get_property(np, "reg", NULL); 
+                if (reg == NULL)
+                        goto next_port;
+                /* We assume the interrupt number isn't translated ... */
+                interrupts = (u32 *)get_property(np, "interrupts", NULL);
+                /* get clock freq. if present */
+                clk = (u32 *)get_property(np, "clock-frequency", NULL);
+                /* get default speed if present */
+                spd = (u32 *)get_property(np, "current-speed", NULL);
+                /* Default to locate at end of array */
+                index = old_serial_count; /* end of the array by default */
+
+                /* If we have a location index, then use it */
+                if (typep && *typep == 'S') {
+                        index = simple_strtol(typep+1, NULL, 0) - 1;
+                        /* if index is out of range, use end of array instead */
+                        if (index >= MAX_LEGACY_SERIAL_PORTS)
+                                index = old_serial_count;
+                        /* if our index is still out of range, that mean that
+                         * array is full, we could scan for a free slot but that
+                         * make little sense to bother, just skip the port
+                         */
+                        if (index >= MAX_LEGACY_SERIAL_PORTS)
+                                goto next_port;
+                        if (index >= old_serial_count)
+                                old_serial_count = index + 1;
+                        /* Check if there is a port who already claimed our slot */
+                        if (serial_ports[index].iobase != 0) {
+                                /* if we still have some room, move it, else override */
+                                if (old_serial_count < MAX_LEGACY_SERIAL_PORTS) {
+                                        DBG("Moved legacy port %d -> %d\n", index,
+                                            old_serial_count);
+                                        serial_ports[old_serial_count++] =
+                                                serial_ports[index];
+                                } else {
+                                        DBG("Replacing legacy port %d\n", index);
+                                }
+                        }
+                }
+                if (index >= MAX_LEGACY_SERIAL_PORTS)
+                        goto next_port;
+                if (index >= old_serial_count)
+                        old_serial_count = index + 1;
+
+                /* Now fill the entry */
+                memset(&serial_ports[index], 0, sizeof(struct plat_serial8250_port));
+                serial_ports[index].uartclk = clk ? *clk : BASE_BAUD * 16;
+                serial_ports[index].iobase = reg->address;
+                serial_ports[index].irq = interrupts ? interrupts[0] : 0;
+                serial_ports[index].flags = ASYNC_BOOT_AUTOCONF;
+
+                DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
+                    index,
+                    serial_ports[index].iobase,
+                    serial_ports[index].irq,
+                    serial_ports[index].uartclk);
+
+                /* Get phys address of IO reg for port 1 */
+                if (index != 0)
+                        goto next_port;
+
+                pci = of_get_parent(isa);
+                if (!pci) {
+                        DBG("%s: no pci parent found\n", np->full_name);
+                        goto next_port;
+                }
+
+                rangesp = (u32 *)get_property(pci, "ranges", &rlen);
+                if (rangesp == NULL) {
+                        of_node_put(pci);
+                        goto next_port;
+                }
+                rlen /= 4;
+
+                /* we need the #size-cells of the PCI bridge node itself */
+                phys_size = 1;
+                sizeprop = (u32 *)get_property(pci, "#size-cells", NULL);
+                if (sizeprop != NULL)
+                        phys_size = *sizeprop;
+                /* we need the parent #addr-cells */
+                addr_size = prom_n_addr_cells(pci);
+                rentsize = 3 + addr_size + phys_size;
+                io_base = 0;
+                for (;rlen >= rentsize; rlen -= rentsize,rangesp += rentsize) {
+                        if (((rangesp[0] >> 24) & 0x3) != 1)
+                                continue; /* not IO space */
+                        io_base = rangesp[3];
+                        if (addr_size == 2)
+                                io_base = (io_base << 32) | rangesp[4];
+                }
+                if (io_base != 0) {
+                        *physport = io_base + reg->address;
+                        if (default_speed && spd)
+                                *default_speed = *spd;
+                }
+                of_node_put(pci);
+        next_port:
+                of_node_put(isa);
+        }
+
+        DBG(" <- generic_find_legacy_serial_port()\n");
+}
+
+static struct platform_device serial_device = {
+        .name   = "serial8250",
+        .id     = 0,
+        .dev    = {
+                .platform_data = serial_ports,
+        },
+};
+
+static int __init serial_dev_init(void)
+{
+        return platform_device_register(&serial_device);
+}
+arch_initcall(serial_dev_init);
+
+#endif /* CONFIG_PPC_ISERIES */
+
+int check_legacy_ioport(unsigned long base_port)
+{
+        if (ppc_md.check_legacy_ioport == NULL)
+                return 0;
+        return ppc_md.check_legacy_ioport(base_port);
+}
+EXPORT_SYMBOL(check_legacy_ioport);
+
+#ifdef CONFIG_XMON
+static int __init early_xmon(char *p)
+{
+        /* ensure xmon is enabled */
+        if (p) {
+                if (strncmp(p, "on", 2) == 0)
+                        xmon_init();
+                if (strncmp(p, "early", 5) != 0)
+                        return 0;
+        }
+        xmon_init();
+        debugger(NULL);
+
+        return 0;
+}
+early_param("xmon", early_xmon);
+#endif
+
+void cpu_die(void)
+{
+        if (ppc_md.cpu_die)
+                ppc_md.cpu_die();
+}