Linux-2.6.12-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 0000000..21c57f5
--- /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();
+}