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, 1002 insertions, 0 deletions

diff --git a/arch/ppc/syslib/prom_init.c b/arch/ppc/syslib/prom_init.c
new file mode 100644
index 000000000000..2cee87137f2e
--- /dev/null
+++ b/arch/ppc/syslib/prom_init.c
@@ -0,0 +1,1002 @@
+/*
+ * Note that prom_init() and anything called from prom_init()
+ * may be running at an address that is different from the address
+ * that it was linked at.  References to static data items are
+ * handled by compiling this file with -mrelocatable-lib.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/version.h>
+#include <linux/threads.h>
+#include <linux/spinlock.h>
+#include <linux/ioport.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/bitops.h>
+
+#include <asm/sections.h>
+#include <asm/prom.h>
+#include <asm/page.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/smp.h>
+#include <asm/bootx.h>
+#include <asm/system.h>
+#include <asm/mmu.h>
+#include <asm/pgtable.h>
+#include <asm/bootinfo.h>
+#include <asm/btext.h>
+#include <asm/pci-bridge.h>
+#include <asm/open_pic.h>
+#include <asm/cacheflush.h>
+
+#ifdef CONFIG_LOGO_LINUX_CLUT224
+#include <linux/linux_logo.h>
+extern const struct linux_logo logo_linux_clut224;
+#endif
+
+/*
+ * Properties whose value is longer than this get excluded from our
+ * copy of the device tree.  This way we don't waste space storing
+ * things like "driver,AAPL,MacOS,PowerPC" properties.  But this value
+ * does need to be big enough to ensure that we don't lose things
+ * like the interrupt-map property on a PCI-PCI bridge.
+ */
+#define MAX_PROPERTY_LENGTH     4096
+
+#ifndef FB_MAX                  /* avoid pulling in all of the fb stuff */
+#define FB_MAX  8
+#endif
+
+#define ALIGNUL(x) (((x) + sizeof(unsigned long)-1) & -sizeof(unsigned long))
+
+typedef u32 prom_arg_t;
+
+struct prom_args {
+        const char *service;
+        int nargs;
+        int nret;
+        prom_arg_t args[10];
+};
+
+struct pci_address {
+        unsigned a_hi;
+        unsigned a_mid;
+        unsigned a_lo;
+};
+
+struct pci_reg_property {
+        struct pci_address addr;
+        unsigned size_hi;
+        unsigned size_lo;
+};
+
+struct pci_range {
+        struct pci_address addr;
+        unsigned phys;
+        unsigned size_hi;
+        unsigned size_lo;
+};
+
+struct isa_reg_property {
+        unsigned space;
+        unsigned address;
+        unsigned size;
+};
+
+struct pci_intr_map {
+        struct pci_address addr;
+        unsigned dunno;
+        phandle int_ctrler;
+        unsigned intr;
+};
+
+static void prom_exit(void);
+static int  call_prom(const char *service, int nargs, int nret, ...);
+static int  call_prom_ret(const char *service, int nargs, int nret,
+                          prom_arg_t *rets, ...);
+static void prom_print_hex(unsigned int v);
+static int  prom_set_color(ihandle ih, int i, int r, int g, int b);
+static int  prom_next_node(phandle *nodep);
+static unsigned long check_display(unsigned long mem);
+static void setup_disp_fake_bi(ihandle dp);
+static unsigned long copy_device_tree(unsigned long mem_start,
+                                unsigned long mem_end);
+static unsigned long inspect_node(phandle node, struct device_node *dad,
+                                unsigned long mem_start, unsigned long mem_end,
+                                struct device_node ***allnextpp);
+static void prom_hold_cpus(unsigned long mem);
+static void prom_instantiate_rtas(void);
+static void * early_get_property(unsigned long base, unsigned long node,
+                                char *prop);
+
+prom_entry prom __initdata;
+ihandle prom_chosen __initdata;
+ihandle prom_stdout __initdata;
+
+static char *prom_display_paths[FB_MAX] __initdata;
+static phandle prom_display_nodes[FB_MAX] __initdata;
+static unsigned int prom_num_displays __initdata;
+static ihandle prom_disp_node __initdata;
+char *of_stdout_device __initdata;
+
+unsigned int rtas_data;   /* physical pointer */
+unsigned int rtas_entry;  /* physical pointer */
+unsigned int rtas_size;
+unsigned int old_rtas;
+
+boot_infos_t *boot_infos;
+char *bootpath;
+char *bootdevice;
+struct device_node *allnodes;
+
+extern char *klimit;
+
+static void __init
+prom_exit(void)
+{
+        struct prom_args args;
+
+        args.service = "exit";
+        args.nargs = 0;
+        args.nret = 0;
+        prom(&args);
+        for (;;)                        /* should never get here */
+                ;
+}
+
+static int __init
+call_prom(const char *service, int nargs, int nret, ...)
+{
+        va_list list;
+        int i;
+        struct prom_args prom_args;
+
+        prom_args.service = service;
+        prom_args.nargs = nargs;
+        prom_args.nret = nret;
+        va_start(list, nret);
+        for (i = 0; i < nargs; ++i)
+                prom_args.args[i] = va_arg(list, prom_arg_t);
+        va_end(list);
+        for (i = 0; i < nret; ++i)
+                prom_args.args[i + nargs] = 0;
+        prom(&prom_args);
+        return prom_args.args[nargs];
+}
+
+static int __init
+call_prom_ret(const char *service, int nargs, int nret, prom_arg_t *rets, ...)
+{
+        va_list list;
+        int i;
+        struct prom_args prom_args;
+
+        prom_args.service = service;
+        prom_args.nargs = nargs;
+        prom_args.nret = nret;
+        va_start(list, rets);
+        for (i = 0; i < nargs; ++i)
+                prom_args.args[i] = va_arg(list, int);
+        va_end(list);
+        for (i = 0; i < nret; ++i)
+                prom_args.args[i + nargs] = 0;
+        prom(&prom_args);
+        for (i = 1; i < nret; ++i)
+                rets[i-1] = prom_args.args[nargs + i];
+        return prom_args.args[nargs];
+}
+
+void __init
+prom_print(const char *msg)
+{
+        const char *p, *q;
+
+        if (prom_stdout == 0)
+                return;
+
+        for (p = msg; *p != 0; p = q) {
+                for (q = p; *q != 0 && *q != '\n'; ++q)
+                        ;
+                if (q > p)
+                        call_prom("write", 3, 1, prom_stdout, p, q - p);
+                if (*q != 0) {
+                        ++q;
+                        call_prom("write", 3, 1, prom_stdout, "\r\n", 2);
+                }
+        }
+}
+
+static void __init
+prom_print_hex(unsigned int v)
+{
+        char buf[16];
+        int i, c;
+
+        for (i = 0; i < 8; ++i) {
+                c = (v >> ((7-i)*4)) & 0xf;
+                c += (c >= 10)? ('a' - 10): '0';
+                buf[i] = c;
+        }
+        buf[i] = ' ';
+        buf[i+1] = 0;
+        prom_print(buf);
+}
+
+static int __init
+prom_set_color(ihandle ih, int i, int r, int g, int b)
+{
+        return call_prom("call-method", 6, 1, "color!", ih, i, b, g, r);
+}
+
+static int __init
+prom_next_node(phandle *nodep)
+{
+        phandle node;
+
+        if ((node = *nodep) != 0
+            && (*nodep = call_prom("child", 1, 1, node)) != 0)
+                return 1;
+        if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
+                return 1;
+        for (;;) {
+                if ((node = call_prom("parent", 1, 1, node)) == 0)
+                        return 0;
+                if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
+                        return 1;
+        }
+}
+
+#ifdef CONFIG_POWER4
+/*
+ * Set up a hash table with a set of entries in it to map the
+ * first 64MB of RAM.  This is used on 64-bit machines since
+ * some of them don't have BATs.
+ */
+
+static inline void make_pte(unsigned long htab, unsigned int hsize,
+                            unsigned int va, unsigned int pa, int mode)
+{
+        unsigned int *pteg;
+        unsigned int hash, i, vsid;
+
+        vsid = ((va >> 28) * 0x111) << 12;
+        hash = ((va ^ vsid) >> 5) & 0x7fff80;
+        pteg = (unsigned int *)(htab + (hash & (hsize - 1)));
+        for (i = 0; i < 8; ++i, pteg += 4) {
+                if ((pteg[1] & 1) == 0) {
+                        pteg[1] = vsid | ((va >> 16) & 0xf80) | 1;
+                        pteg[3] = pa | mode;
+                        break;
+                }
+        }
+}
+
+extern unsigned long _SDR1;
+extern PTE *Hash;
+extern unsigned long Hash_size;
+
+static void __init
+prom_alloc_htab(void)
+{
+        unsigned int hsize;
+        unsigned long htab;
+        unsigned int addr;
+
+        /*
+         * Because of OF bugs we can't use the "claim" client
+         * interface to allocate memory for the hash table.
+         * This code is only used on 64-bit PPCs, and the only
+         * 64-bit PPCs at the moment are RS/6000s, and their
+         * OF is based at 0xc00000 (the 12M point), so we just
+         * arbitrarily use the 0x800000 - 0xc00000 region for the
+         * hash table.
+         *  -- paulus.
+         */
+        hsize = 4 << 20;        /* POWER4 has no BATs */
+        htab = (8 << 20);
+        call_prom("claim", 3, 1, htab, hsize, 0);
+        Hash = (void *)(htab + KERNELBASE);
+        Hash_size = hsize;
+        _SDR1 = htab + __ilog2(hsize) - 18;
+
+        /*
+         * Put in PTEs for the first 64MB of RAM
+         */
+        memset((void *)htab, 0, hsize);
+        for (addr = 0; addr < 0x4000000; addr += 0x1000)
+                make_pte(htab, hsize, addr + KERNELBASE, addr,
+                         _PAGE_ACCESSED | _PAGE_COHERENT | PP_RWXX);
+#if 0 /* DEBUG stuff mapping the SCC */
+        make_pte(htab, hsize, 0x80013000, 0x80013000,
+                 _PAGE_ACCESSED | _PAGE_NO_CACHE | _PAGE_GUARDED | PP_RWXX);
+#endif
+}
+#endif /* CONFIG_POWER4 */
+
+
+/*
+ * If we have a display that we don't know how to drive,
+ * we will want to try to execute OF's open method for it
+ * later.  However, OF will probably fall over if we do that
+ * we've taken over the MMU.
+ * So we check whether we will need to open the display,
+ * and if so, open it now.
+ */
+static unsigned long __init
+check_display(unsigned long mem)
+{
+        phandle node;
+        ihandle ih;
+        int i, j;
+        char type[16], *path;
+        static unsigned char default_colors[] = {
+                0x00, 0x00, 0x00,
+                0x00, 0x00, 0xaa,
+                0x00, 0xaa, 0x00,
+                0x00, 0xaa, 0xaa,
+                0xaa, 0x00, 0x00,
+                0xaa, 0x00, 0xaa,
+                0xaa, 0xaa, 0x00,
+                0xaa, 0xaa, 0xaa,
+                0x55, 0x55, 0x55,
+                0x55, 0x55, 0xff,
+                0x55, 0xff, 0x55,
+                0x55, 0xff, 0xff,
+                0xff, 0x55, 0x55,
+                0xff, 0x55, 0xff,
+                0xff, 0xff, 0x55,
+                0xff, 0xff, 0xff
+        };
+        const unsigned char *clut;
+
+        prom_disp_node = 0;
+
+        for (node = 0; prom_next_node(&node); ) {
+                type[0] = 0;
+                call_prom("getprop", 4, 1, node, "device_type",
+                          type, sizeof(type));
+                if (strcmp(type, "display") != 0)
+                        continue;
+                /* It seems OF doesn't null-terminate the path :-( */
+                path = (char *) mem;
+                memset(path, 0, 256);
+                if (call_prom("package-to-path", 3, 1, node, path, 255) < 0)
+                        continue;
+
+                /*
+                 * If this display is the device that OF is using for stdout,
+                 * move it to the front of the list.
+                 */
+                mem += strlen(path) + 1;
+                i = prom_num_displays++;
+                if (of_stdout_device != 0 && i > 0
+                    && strcmp(of_stdout_device, path) == 0) {
+                        for (; i > 0; --i) {
+                                prom_display_paths[i]
+                                        = prom_display_paths[i-1];
+                                prom_display_nodes[i]
+                                        = prom_display_nodes[i-1];
+                        }
+                }
+                prom_display_paths[i] = path;
+                prom_display_nodes[i] = node;
+                if (i == 0)
+                        prom_disp_node = node;
+                if (prom_num_displays >= FB_MAX)
+                        break;
+        }
+
+        for (j=0; j<prom_num_displays; j++) {
+                path = prom_display_paths[j];
+                node = prom_display_nodes[j];
+                prom_print("opening display ");
+                prom_print(path);
+                ih = call_prom("open", 1, 1, path);
+                if (ih == 0 || ih == (ihandle) -1) {
+                        prom_print("... failed\n");
+                        for (i=j+1; i<prom_num_displays; i++) {
+                                prom_display_paths[i-1] = prom_display_paths[i];
+                                prom_display_nodes[i-1] = prom_display_nodes[i];
+                        }
+                        if (--prom_num_displays > 0) {
+                                prom_disp_node = prom_display_nodes[j];
+                                j--;
+                        } else
+                                prom_disp_node = 0;
+                        continue;
+                } else {
+                        prom_print("... ok\n");
+                        call_prom("setprop", 4, 1, node, "linux,opened", 0, 0);
+
+                        /*
+                         * Setup a usable color table when the appropriate
+                         * method is available.
+                         * Should update this to use set-colors.
+                         */
+                        clut = default_colors;
+                        for (i = 0; i < 32; i++, clut += 3)
+                                if (prom_set_color(ih, i, clut[0], clut[1],
+                                                   clut[2]) != 0)
+                                        break;
+
+#ifdef CONFIG_LOGO_LINUX_CLUT224
+                        clut = PTRRELOC(logo_linux_clut224.clut);
+                        for (i = 0; i < logo_linux_clut224.clutsize;
+                             i++, clut += 3)
+                                if (prom_set_color(ih, i + 32, clut[0],
+                                                   clut[1], clut[2]) != 0)
+                                        break;
+#endif /* CONFIG_LOGO_LINUX_CLUT224 */
+                }
+        }
+        
+        if (prom_stdout) {
+                phandle p;
+                p = call_prom("instance-to-package", 1, 1, prom_stdout);
+                if (p && p != -1) {
+                        type[0] = 0;
+                        call_prom("getprop", 4, 1, p, "device_type",
+                                  type, sizeof(type));
+                        if (strcmp(type, "display") == 0)
+                                call_prom("setprop", 4, 1, p, "linux,boot-display",
+                                          0, 0);
+                }
+        }
+
+        return ALIGNUL(mem);
+}
+
+/* This function will enable the early boot text when doing OF booting. This
+ * way, xmon output should work too
+ */
+static void __init
+setup_disp_fake_bi(ihandle dp)
+{
+#ifdef CONFIG_BOOTX_TEXT
+        int width = 640, height = 480, depth = 8, pitch;
+        unsigned address;
+        struct pci_reg_property addrs[8];
+        int i, naddrs;
+        char name[32];
+        char *getprop = "getprop";
+
+        prom_print("Initializing fake screen: ");
+
+        memset(name, 0, sizeof(name));
+        call_prom(getprop, 4, 1, dp, "name", name, sizeof(name));
+        name[sizeof(name)-1] = 0;
+        prom_print(name);
+        prom_print("\n");
+        call_prom(getprop, 4, 1, dp, "width", &width, sizeof(width));
+        call_prom(getprop, 4, 1, dp, "height", &height, sizeof(height));
+        call_prom(getprop, 4, 1, dp, "depth", &depth, sizeof(depth));
+        pitch = width * ((depth + 7) / 8);
+        call_prom(getprop, 4, 1, dp, "linebytes",
+                  &pitch, sizeof(pitch));
+        if (pitch == 1)
+                pitch = 0x1000;         /* for strange IBM display */
+        address = 0;
+        call_prom(getprop, 4, 1, dp, "address",
+                  &address, sizeof(address));
+        if (address == 0) {
+                /* look for an assigned address with a size of >= 1MB */
+                naddrs = call_prom(getprop, 4, 1, dp, "assigned-addresses",
+                                   addrs, sizeof(addrs));
+                naddrs /= sizeof(struct pci_reg_property);
+                for (i = 0; i < naddrs; ++i) {
+                        if (addrs[i].size_lo >= (1 << 20)) {
+                                address = addrs[i].addr.a_lo;
+                                /* use the BE aperture if possible */
+                                if (addrs[i].size_lo >= (16 << 20))
+                                        address += (8 << 20);
+                                break;
+                        }
+                }
+                if (address == 0) {
+                        prom_print("Failed to get address\n");
+                        return;
+                }
+        }
+        /* kludge for valkyrie */
+        if (strcmp(name, "valkyrie") == 0)
+                address += 0x1000;
+
+#ifdef CONFIG_POWER4
+#if CONFIG_TASK_SIZE > 0x80000000
+#error CONFIG_TASK_SIZE cannot be above 0x80000000 with BOOTX_TEXT on G5
+#endif
+        {
+                extern boot_infos_t disp_bi;
+                unsigned long va, pa, i, offset;
+                va = 0x90000000;
+                pa = address & 0xfffff000ul;
+                offset = address & 0x00000fff;
+
+                for (i=0; i<0x4000; i++) {  
+                        make_pte((unsigned long)Hash - KERNELBASE, Hash_size, va, pa, 
+                                 _PAGE_ACCESSED | _PAGE_NO_CACHE |
+                                 _PAGE_GUARDED | PP_RWXX);
+                        va += 0x1000;
+                        pa += 0x1000;
+                }
+                btext_setup_display(width, height, depth, pitch, 0x90000000 | offset);
+                disp_bi.dispDeviceBase = (u8 *)address;
+        }
+#else /* CONFIG_POWER4 */
+        btext_setup_display(width, height, depth, pitch, address);
+        btext_prepare_BAT();
+#endif /* CONFIG_POWER4 */
+#endif /* CONFIG_BOOTX_TEXT */
+}
+
+/*
+ * Make a copy of the device tree from the PROM.
+ */
+static unsigned long __init
+copy_device_tree(unsigned long mem_start, unsigned long mem_end)
+{
+        phandle root;
+        unsigned long new_start;
+        struct device_node **allnextp;
+
+        root = call_prom("peer", 1, 1, (phandle)0);
+        if (root == (phandle)0) {
+                prom_print("couldn't get device tree root\n");
+                prom_exit();
+        }
+        allnextp = &allnodes;
+        mem_start = ALIGNUL(mem_start);
+        new_start = inspect_node(root, NULL, mem_start, mem_end, &allnextp);
+        *allnextp = NULL;
+        return new_start;
+}
+
+static unsigned long __init
+inspect_node(phandle node, struct device_node *dad,
+             unsigned long mem_start, unsigned long mem_end,
+             struct device_node ***allnextpp)
+{
+        int l;
+        phandle child;
+        struct device_node *np;
+        struct property *pp, **prev_propp;
+        char *prev_name, *namep;
+        unsigned char *valp;
+
+        np = (struct device_node *) mem_start;
+        mem_start += sizeof(struct device_node);
+        memset(np, 0, sizeof(*np));
+        np->node = node;
+        **allnextpp = PTRUNRELOC(np);
+        *allnextpp = &np->allnext;
+        if (dad != 0) {
+                np->parent = PTRUNRELOC(dad);
+                /* we temporarily use the `next' field as `last_child'. */
+                if (dad->next == 0)
+                        dad->child = PTRUNRELOC(np);
+                else
+                        dad->next->sibling = PTRUNRELOC(np);
+                dad->next = np;
+        }
+
+        /* get and store all properties */
+        prev_propp = &np->properties;
+        prev_name = "";
+        for (;;) {
+                pp = (struct property *) mem_start;
+                namep = (char *) (pp + 1);
+                pp->name = PTRUNRELOC(namep);
+                if (call_prom("nextprop", 3, 1, node, prev_name, namep) <= 0)
+                        break;
+                mem_start = ALIGNUL((unsigned long)namep + strlen(namep) + 1);
+                prev_name = namep;
+                valp = (unsigned char *) mem_start;
+                pp->value = PTRUNRELOC(valp);
+                pp->length = call_prom("getprop", 4, 1, node, namep,
+                                       valp, mem_end - mem_start);
+                if (pp->length < 0)
+                        continue;
+#ifdef MAX_PROPERTY_LENGTH
+                if (pp->length > MAX_PROPERTY_LENGTH)
+                        continue; /* ignore this property */
+#endif
+                mem_start = ALIGNUL(mem_start + pp->length);
+                *prev_propp = PTRUNRELOC(pp);
+                prev_propp = &pp->next;
+        }
+        if (np->node != 0) {
+                /* Add a "linux,phandle" property" */
+                pp = (struct property *) mem_start;
+                *prev_propp = PTRUNRELOC(pp);
+                prev_propp = &pp->next;
+                namep = (char *) (pp + 1);
+                pp->name = PTRUNRELOC(namep);
+                strcpy(namep, "linux,phandle");
+                mem_start = ALIGNUL((unsigned long)namep + strlen(namep) + 1);
+                pp->value = (unsigned char *) PTRUNRELOC(&np->node);
+                pp->length = sizeof(np->node);
+        }
+        *prev_propp = NULL;
+
+        /* get the node's full name */
+        l = call_prom("package-to-path", 3, 1, node,
+                      mem_start, mem_end - mem_start);
+        if (l >= 0) {
+                np->full_name = PTRUNRELOC((char *) mem_start);
+                *(char *)(mem_start + l) = 0;
+                mem_start = ALIGNUL(mem_start + l + 1);
+        }
+
+        /* do all our children */
+        child = call_prom("child", 1, 1, node);
+        while (child != 0) {
+                mem_start = inspect_node(child, np, mem_start, mem_end,
+                                         allnextpp);
+                child = call_prom("peer", 1, 1, child);
+        }
+
+        return mem_start;
+}
+
+unsigned long smp_chrp_cpu_nr __initdata = 0;
+
+/*
+ * With CHRP SMP we need to use the OF to start the other
+ * processors so we can't wait until smp_boot_cpus (the OF is
+ * trashed by then) so we have to put the processors into
+ * a holding pattern controlled by the kernel (not OF) before
+ * we destroy the OF.
+ *
+ * This uses a chunk of high memory, puts some holding pattern
+ * code there and sends the other processors off to there until
+ * smp_boot_cpus tells them to do something.  We do that by using
+ * physical address 0x0.  The holding pattern checks that address
+ * until its cpu # is there, when it is that cpu jumps to
+ * __secondary_start().  smp_boot_cpus() takes care of setting those
+ * values.
+ *
+ * We also use physical address 0x4 here to tell when a cpu
+ * is in its holding pattern code.
+ *
+ * -- Cort
+ *
+ * Note that we have to do this if we have more than one CPU,
+ * even if this is a UP kernel.  Otherwise when we trash OF
+ * the other CPUs will start executing some random instructions
+ * and crash the system.  -- paulus
+ */
+static void __init
+prom_hold_cpus(unsigned long mem)
+{
+        extern void __secondary_hold(void);
+        unsigned long i;
+        int cpu;
+        phandle node;
+        char type[16], *path;
+        unsigned int reg;
+
+        /*
+         * XXX: hack to make sure we're chrp, assume that if we're
+         *      chrp we have a device_type property -- Cort
+         */
+        node = call_prom("finddevice", 1, 1, "/");
+        if (call_prom("getprop", 4, 1, node,
+                      "device_type", type, sizeof(type)) <= 0)
+                return;
+
+        /* copy the holding pattern code to someplace safe (0) */
+        /* the holding pattern is now within the first 0x100
+           bytes of the kernel image -- paulus */
+        memcpy((void *)0, _stext, 0x100);
+        flush_icache_range(0, 0x100);
+
+        /* look for cpus */
+        *(unsigned long *)(0x0) = 0;
+        asm volatile("dcbf 0,%0": : "r" (0) : "memory");
+        for (node = 0; prom_next_node(&node); ) {
+                type[0] = 0;
+                call_prom("getprop", 4, 1, node, "device_type",
+                          type, sizeof(type));
+                if (strcmp(type, "cpu") != 0)
+                        continue;
+                path = (char *) mem;
+                memset(path, 0, 256);
+                if (call_prom("package-to-path", 3, 1, node, path, 255) < 0)
+                        continue;
+                reg = -1;
+                call_prom("getprop", 4, 1, node, "reg", &reg, sizeof(reg));
+                cpu = smp_chrp_cpu_nr++;
+#ifdef CONFIG_SMP
+                smp_hw_index[cpu] = reg;
+#endif /* CONFIG_SMP */
+                /* XXX: hack - don't start cpu 0, this cpu -- Cort */
+                if (cpu == 0)
+                        continue;
+                prom_print("starting cpu ");
+                prom_print(path);
+                *(ulong *)(0x4) = 0;
+                call_prom("start-cpu", 3, 0, node,
+                          (char *)__secondary_hold - _stext, cpu);
+                prom_print("...");
+                for ( i = 0 ; (i < 10000) && (*(ulong *)(0x4) == 0); i++ )
+                        ;
+                if (*(ulong *)(0x4) == cpu)
+                        prom_print("ok\n");
+                else {
+                        prom_print("failed: ");
+                        prom_print_hex(*(ulong *)0x4);
+                        prom_print("\n");
+                }
+        }
+}
+
+static void __init
+prom_instantiate_rtas(void)
+{
+        ihandle prom_rtas;
+        prom_arg_t result;
+
+        prom_rtas = call_prom("finddevice", 1, 1, "/rtas");
+        if (prom_rtas == -1)
+                return;
+
+        rtas_size = 0;
+        call_prom("getprop", 4, 1, prom_rtas,
+                  "rtas-size", &rtas_size, sizeof(rtas_size));
+        prom_print("instantiating rtas");
+        if (rtas_size == 0) {
+                rtas_data = 0;
+        } else {
+                /*
+                 * Ask OF for some space for RTAS.
+                 * Actually OF has bugs so we just arbitrarily
+                 * use memory at the 6MB point.
+                 */
+                rtas_data = 6 << 20;
+                prom_print(" at ");
+                prom_print_hex(rtas_data);
+        }
+
+        prom_rtas = call_prom("open", 1, 1, "/rtas");
+        prom_print("...");
+        rtas_entry = 0;
+        if (call_prom_ret("call-method", 3, 2, &result,
+                          "instantiate-rtas", prom_rtas, rtas_data) == 0)
+                rtas_entry = result;
+        if ((rtas_entry == -1) || (rtas_entry == 0))
+                prom_print(" failed\n");
+        else
+                prom_print(" done\n");
+}
+
+/*
+ * We enter here early on, when the Open Firmware prom is still
+ * handling exceptions and the MMU hash table for us.
+ */
+unsigned long __init
+prom_init(int r3, int r4, prom_entry pp)
+{
+        unsigned long mem;
+        ihandle prom_mmu;
+        unsigned long offset = reloc_offset();
+        int i, l;
+        char *p, *d;
+        unsigned long phys;
+        prom_arg_t result[3];
+        char model[32];
+        phandle node;
+        int rc;
+
+        /* Default */
+        phys = (unsigned long) &_stext;
+
+        /* First get a handle for the stdout device */
+        prom = pp;
+        prom_chosen = call_prom("finddevice", 1, 1, "/chosen");
+        if (prom_chosen == -1)
+                prom_exit();
+        if (call_prom("getprop", 4, 1, prom_chosen, "stdout",
+                      &prom_stdout, sizeof(prom_stdout)) <= 0)
+                prom_exit();
+
+        /* Get the full OF pathname of the stdout device */
+        mem = (unsigned long) klimit + offset;
+        p = (char *) mem;
+        memset(p, 0, 256);
+        call_prom("instance-to-path", 3, 1, prom_stdout, p, 255);
+        of_stdout_device = p;
+        mem += strlen(p) + 1;
+
+        /* Get the boot device and translate it to a full OF pathname. */
+        p = (char *) mem;
+        l = call_prom("getprop", 4, 1, prom_chosen, "bootpath", p, 1<<20);
+        if (l > 0) {
+                p[l] = 0;       /* should already be null-terminated */
+                bootpath = PTRUNRELOC(p);
+                mem += l + 1;
+                d = (char *) mem;
+                *d = 0;
+                call_prom("canon", 3, 1, p, d, 1<<20);
+                bootdevice = PTRUNRELOC(d);
+                mem = ALIGNUL(mem + strlen(d) + 1);
+        }
+
+        prom_instantiate_rtas();
+
+#ifdef CONFIG_POWER4
+        /*
+         * Find out how much memory we have and allocate a
+         * suitably-sized hash table.
+         */
+        prom_alloc_htab();
+#endif
+        mem = check_display(mem);
+
+        prom_print("copying OF device tree...");
+        mem = copy_device_tree(mem, mem + (1<<20));
+        prom_print("done\n");
+
+        prom_hold_cpus(mem);
+
+        klimit = (char *) (mem - offset);
+
+        node = call_prom("finddevice", 1, 1, "/");
+        rc = call_prom("getprop", 4, 1, node, "model", model, sizeof(model));
+        if (rc > 0 && !strncmp (model, "Pegasos", 7)
+                && strncmp (model, "Pegasos2", 8)) {
+                /* Pegasos 1 has a broken translate method in the OF,
+                 * and furthermore the BATs are mapped 1:1 so the phys
+                 * address calculated above is correct, so let's use
+                 * it directly.
+                 */
+        } else if (offset == 0) {
+                /* If we are already running at 0xc0000000, we assume we were
+                 * loaded by an OF bootloader which did set a BAT for us.
+                 * This breaks OF translate so we force phys to be 0.
+                 */
+                prom_print("(already at 0xc0000000) phys=0\n");
+                phys = 0;
+        } else if (call_prom("getprop", 4, 1, prom_chosen, "mmu",
+                             &prom_mmu, sizeof(prom_mmu)) <= 0) {
+                prom_print(" no MMU found\n");
+        } else if (call_prom_ret("call-method", 4, 4, result, "translate",
+                                 prom_mmu, &_stext, 1) != 0) {
+                prom_print(" (translate failed)\n");
+        } else {
+                /* We assume the phys. address size is 3 cells */
+                phys = result[2];
+        }
+
+        if (prom_disp_node != 0)
+                setup_disp_fake_bi(prom_disp_node);
+
+        /* Use quiesce call to get OF to shut down any devices it's using */
+        prom_print("Calling quiesce ...\n");
+        call_prom("quiesce", 0, 0);
+
+        /* Relocate various pointers which will be used once the
+           kernel is running at the address it was linked at. */
+        for (i = 0; i < prom_num_displays; ++i)
+                prom_display_paths[i] = PTRUNRELOC(prom_display_paths[i]);
+
+#ifdef CONFIG_SERIAL_CORE_CONSOLE
+        /* Relocate the of stdout for console autodetection */
+        of_stdout_device = PTRUNRELOC(of_stdout_device);
+#endif
+
+        prom_print("returning 0x");
+        prom_print_hex(phys);
+        prom_print("from prom_init\n");
+        prom_stdout = 0;
+
+        return phys;
+}
+
+/*
+ * early_get_property is used to access the device tree image prepared
+ * by BootX very early on, before the pointers in it have been relocated.
+ */
+static void * __init
+early_get_property(unsigned long base, unsigned long node, char *prop)
+{
+        struct device_node *np = (struct device_node *)(base + node);
+        struct property *pp;
+
+        for (pp = np->properties; pp != 0; pp = pp->next) {
+                pp = (struct property *) (base + (unsigned long)pp);
+                if (strcmp((char *)((unsigned long)pp->name + base),
+                           prop) == 0) {
+                        return (void *)((unsigned long)pp->value + base);
+                }
+        }
+        return NULL;
+}
+
+/* Is boot-info compatible ? */
+#define BOOT_INFO_IS_COMPATIBLE(bi)             ((bi)->compatible_version <= BOOT_INFO_VERSION)
+#define BOOT_INFO_IS_V2_COMPATIBLE(bi)  ((bi)->version >= 2)
+#define BOOT_INFO_IS_V4_COMPATIBLE(bi)  ((bi)->version >= 4)
+
+void __init
+bootx_init(unsigned long r4, unsigned long phys)
+{
+        boot_infos_t *bi = (boot_infos_t *) r4;
+        unsigned long space;
+        unsigned long ptr, x;
+        char *model;
+
+        boot_infos = PTRUNRELOC(bi);
+        if (!BOOT_INFO_IS_V2_COMPATIBLE(bi))
+                bi->logicalDisplayBase = NULL;
+
+#ifdef CONFIG_BOOTX_TEXT
+        btext_init(bi);
+
+        /*
+         * Test if boot-info is compatible.  Done only in config
+         * CONFIG_BOOTX_TEXT since there is nothing much we can do
+         * with an incompatible version, except display a message
+         * and eventually hang the processor...
+         *
+         * I'll try to keep enough of boot-info compatible in the
+         * future to always allow display of this message;
+         */
+        if (!BOOT_INFO_IS_COMPATIBLE(bi)) {
+                btext_drawstring(" !!! WARNING - Incompatible version of BootX !!!\n\n\n");
+                btext_flushscreen();
+        }
+#endif  /* CONFIG_BOOTX_TEXT */
+
+        /* New BootX enters kernel with MMU off, i/os are not allowed
+           here. This hack will have been done by the boostrap anyway.
+        */
+        if (bi->version < 4) {
+                /*
+                 * XXX If this is an iMac, turn off the USB controller.
+                 */
+                model = (char *) early_get_property
+                        (r4 + bi->deviceTreeOffset, 4, "model");
+                if (model
+                    && (strcmp(model, "iMac,1") == 0
+                        || strcmp(model, "PowerMac1,1") == 0)) {
+                        out_le32((unsigned *)0x80880008, 1);    /* XXX */
+                }
+        }
+
+        /* Move klimit to enclose device tree, args, ramdisk, etc... */
+        if (bi->version < 5) {
+                space = bi->deviceTreeOffset + bi->deviceTreeSize;
+                if (bi->ramDisk)
+                        space = bi->ramDisk + bi->ramDiskSize;
+        } else
+                space = bi->totalParamsSize;
+        klimit = PTRUNRELOC((char *) bi + space);
+
+        /* New BootX will have flushed all TLBs and enters kernel with
+           MMU switched OFF, so this should not be useful anymore.
+        */
+        if (bi->version < 4) {
+                /*
+                 * Touch each page to make sure the PTEs for them
+                 * are in the hash table - the aim is to try to avoid
+                 * getting DSI exceptions while copying the kernel image.
+                 */
+                for (ptr = ((unsigned long) &_stext) & PAGE_MASK;
+                     ptr < (unsigned long)bi + space; ptr += PAGE_SIZE)
+                        x = *(volatile unsigned long *)ptr;
+        }
+
+#ifdef CONFIG_BOOTX_TEXT
+        /*
+         * Note that after we call btext_prepare_BAT, we can't do
+         * prom_draw*, flushscreen or clearscreen until we turn the MMU
+         * on, since btext_prepare_BAT sets disp_bi.logicalDisplayBase
+         * to a virtual address.
+         */
+        btext_prepare_BAT();
+#endif
+}