patch-2.4.19 linux-2.4.19/arch/ppc/kernel/prom_init.c
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- Lines: 893
- Date:
Fri Aug 2 17:39:43 2002
- Orig file:
linux-2.4.18/arch/ppc/kernel/prom_init.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.18/arch/ppc/kernel/prom_init.c linux-2.4.19/arch/ppc/kernel/prom_init.c
@@ -0,0 +1,892 @@
+/*
+ * Procedures for interfacing to the Open Firmware PROM on
+ * Power Macintosh computers.
+ *
+ * In particular, we are interested in the device tree
+ * and in using some of its services (exit, write to stdout).
+ *
+ * Paul Mackerras August 1996.
+ * Copyright (C) 1996 Paul Mackerras.
+ */
+/*
+ * 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/init.h>
+
+#include <asm/prom.h>
+#include <asm/io.h>
+#include <asm/bootx.h>
+#include <asm/btext.h>
+#include <asm/mmu.h>
+#include <asm/pgtable.h>
+
+#ifdef CONFIG_FB
+#include <asm/linux_logo.h>
+#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 ALIGN(x) (((x) + sizeof(unsigned long)-1) & -sizeof(unsigned long))
+
+struct prom_args {
+ const char *service;
+ int nargs;
+ int nret;
+ void *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 void *call_prom(const char *service, int nargs, int nret, ...);
+static void *call_prom_ret(const char *service, int nargs, int nret,
+ void **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 = 0;
+ihandle prom_chosen __initdata = 0;
+ihandle prom_stdout __initdata = 0;
+
+char *prom_display_paths[FB_MAX] __initdata = { 0, };
+phandle prom_display_nodes[FB_MAX] __initdata;
+unsigned int prom_num_displays __initdata = 0;
+static char *of_stdout_device __initdata = 0;
+static ihandle prom_disp_node __initdata = 0;
+
+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;
+extern char _stext;
+
+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 void * __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, void *);
+ va_end(list);
+ for (i = 0; i < nret; ++i)
+ prom_args.args[i + nargs] = 0;
+ prom(&prom_args);
+ return prom_args.args[nargs];
+}
+
+static void * __init
+call_prom_ret(const char *service, int nargs, int nret, void **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, void *);
+ 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)
+{
+ struct prom_args prom_args;
+
+ prom_args.service = "call-method";
+ prom_args.nargs = 6;
+ prom_args.nret = 1;
+ prom_args.args[0] = "color!";
+ prom_args.args[1] = ih;
+ prom_args.args[2] = (void *) i;
+ prom_args.args[3] = (void *) b;
+ prom_args.args[4] = (void *) g;
+ prom_args.args[5] = (void *) r;
+ prom(&prom_args);
+ return (int) prom_args.args[6];
+}
+
+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;
+ }
+}
+
+/*
+ * 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;
+ 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
+ };
+
+ 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 ((int) 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;
+ }
+
+try_again:
+ /*
+ * Open the first display and set its colormap.
+ */
+ if (prom_num_displays > 0) {
+ path = prom_display_paths[0];
+ 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=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[0];
+ else
+ prom_disp_node = NULL;
+ goto try_again;
+ } else {
+ prom_print("... ok\n");
+ /*
+ * Setup a usable color table when the appropriate
+ * method is available.
+ * Should update this to use set-colors.
+ */
+ for (i = 0; i < 32; i++)
+ if (prom_set_color(ih, i, default_colors[i*3],
+ default_colors[i*3+1],
+ default_colors[i*3+2]) != 0)
+ break;
+
+#ifdef CONFIG_FB
+ for (i = 0; i < LINUX_LOGO_COLORS; i++)
+ if (prom_set_color(ih, i + 32,
+ linux_logo_red[i],
+ linux_logo_green[i],
+ linux_logo_blue[i]) != 0)
+ break;
+#endif /* CONFIG_FB */
+ }
+ }
+
+ return ALIGN(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 = (int) 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;
+
+ btext_setup_display(width, height, depth, pitch, address);
+
+ btext_prepare_BAT();
+#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 = ALIGN(mem_start);
+ new_start = inspect_node(root, 0, mem_start, mem_end, &allnextp);
+ *allnextp = 0;
+ 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 ((int) call_prom("nextprop", 3, 1, node, prev_name,
+ namep) <= 0)
+ break;
+ mem_start = ALIGN((unsigned long)namep + strlen(namep) + 1);
+ prev_name = namep;
+ valp = (unsigned char *) mem_start;
+ pp->value = PTRUNRELOC(valp);
+ pp->length = (int)
+ 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 = ALIGN(mem_start + pp->length);
+ *prev_propp = PTRUNRELOC(pp);
+ prev_propp = &pp->next;
+ }
+ if (np->node != NULL) {
+ /* 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 = ALIGN((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 = (int) call_prom("package-to-path", 3, 1, node,
+ (char *) mem_start, mem_end - mem_start);
+ if (l >= 0) {
+ np->full_name = PTRUNRELOC((char *) mem_start);
+ *(char *)(mem_start + l) = 0;
+ mem_start = ALIGN(mem_start + l + 1);
+ }
+
+ /* do all our children */
+ child = call_prom("child", 1, 1, node);
+ while (child != (void *)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 ((int)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 ((int) call_prom("package-to-path", 3, 1,
+ node, path, 255) < 0)
+ continue;
+ reg = -1;
+ call_prom("getprop", 4, 1, node, "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;
+ unsigned int i;
+ struct prom_args prom_args;
+
+ prom_rtas = call_prom("finddevice", 1, 1, "/rtas");
+ if (prom_rtas == (void *) -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("...");
+ prom_args.service = "call-method";
+ prom_args.nargs = 3;
+ prom_args.nret = 2;
+ prom_args.args[0] = "instantiate-rtas";
+ prom_args.args[1] = prom_rtas;
+ prom_args.args[2] = (void *) rtas_data;
+ prom(&prom_args);
+ i = 0;
+ if (prom_args.args[3] == 0)
+ i = (unsigned int)prom_args.args[4];
+ rtas_entry = i;
+ 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;
+ void *result[3];
+
+ /* 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 == (void *)-1)
+ prom_exit();
+ if ((int) 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 = (int) 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 = ALIGN(mem + strlen(d) + 1);
+ }
+
+ prom_instantiate_rtas();
+
+ 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);
+
+ /* 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.
+ */
+ if (offset == 0)
+ phys = 0;
+ else if ((int) call_prom("getprop", 4, 1, prom_chosen, "mmu",
+ &prom_mmu, sizeof(prom_mmu)) <= 0) {
+ prom_print(" no MMU found\n");
+ } else if ((int)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 = (unsigned long)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]);
+
+ 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 0;
+}
+
+/* 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 = 0;
+
+#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
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)