[PATCH] powerpc: Add back support for booting from BootX (#2)
Benjamin Herrenschmidt
benh at kernel.crashing.org
Wed Nov 23 17:58:13 EST 2005
ARCH=powerpc couldn't boot from BootX as it uses a "different" way of
getting in the kernel. This patch adds the necessary trampolines,
creating a flattened device-tree from the tree passed from MacOS, and
initializing the btext engine early for really-early debugging.
Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Index: linux-serialfix/arch/powerpc/platforms/powermac/bootx_init.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-serialfix/arch/powerpc/platforms/powermac/bootx_init.c 2005-11-23 16:54:26.000000000 +1100
@@ -0,0 +1,547 @@
+/*
+ * Early boot support code for BootX bootloader
+ *
+ * Copyright (C) 2005 Ben. Herrenschmidt (benh at kernel.crashing.org)
+ *
+ * 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.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/version.h>
+#include <asm/sections.h>
+#include <asm/prom.h>
+#include <asm/page.h>
+#include <asm/bootx.h>
+#include <asm/bootinfo.h>
+#include <asm/btext.h>
+#include <asm/io.h>
+
+#undef DEBUG
+#define SET_BOOT_BAT
+
+#ifdef DEBUG
+#define DBG(fmt...) do { bootx_printf(fmt); } while(0)
+#else
+#define DBG(fmt...) do { } while(0)
+#endif
+
+extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
+
+static unsigned long __initdata bootx_dt_strbase;
+static unsigned long __initdata bootx_dt_strend;
+static unsigned long __initdata bootx_node_chosen;
+static boot_infos_t * __initdata bootx_info;
+static char __initdata bootx_disp_path[256];
+
+/* 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)
+
+#ifdef CONFIG_BOOTX_TEXT
+static void __init bootx_printf(const char *format, ...)
+{
+ const char *p, *q, *s;
+ va_list args;
+ unsigned long v;
+
+ va_start(args, format);
+ for (p = format; *p != 0; p = q) {
+ for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
+ ;
+ if (q > p)
+ btext_drawtext(p, q - p);
+ if (*q == 0)
+ break;
+ if (*q == '\n') {
+ ++q;
+ btext_flushline();
+ btext_drawstring("\r\n");
+ btext_flushline();
+ continue;
+ }
+ ++q;
+ if (*q == 0)
+ break;
+ switch (*q) {
+ case 's':
+ ++q;
+ s = va_arg(args, const char *);
+ if (s == NULL)
+ s = "<NULL>";
+ btext_drawstring(s);
+ break;
+ case 'x':
+ ++q;
+ v = va_arg(args, unsigned long);
+ btext_drawhex(v);
+ break;
+ }
+ }
+}
+#else /* CONFIG_BOOTX_TEXT */
+static void __init bootx_printf(const char *format, ...) {}
+#endif /* CONFIG_BOOTX_TEXT */
+
+static void * __init bootx_early_getprop(unsigned long base,
+ unsigned long node,
+ char *prop)
+{
+ struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
+ u32 *ppp = &np->properties;
+
+ while(*ppp) {
+ struct bootx_dt_prop *pp =
+ (struct bootx_dt_prop *)(base + *ppp);
+
+ if (strcmp((char *)((unsigned long)pp->name + base),
+ prop) == 0) {
+ return (void *)((unsigned long)pp->value + base);
+ }
+ ppp = &pp->next;
+ }
+ return NULL;
+}
+
+#define dt_push_token(token, mem) \
+ do { \
+ *(mem) = _ALIGN_UP(*(mem),4); \
+ *((u32 *)*(mem)) = token; \
+ *(mem) += 4; \
+ } while(0)
+
+static unsigned long __init bootx_dt_find_string(char *str)
+{
+ char *s, *os;
+
+ s = os = (char *)bootx_dt_strbase;
+ s += 4;
+ while (s < (char *)bootx_dt_strend) {
+ if (strcmp(s, str) == 0)
+ return s - os;
+ s += strlen(s) + 1;
+ }
+ return 0;
+}
+
+static void __init bootx_dt_add_prop(char *name, void *data, int size,
+ unsigned long *mem_end)
+{
+ unsigned long soff = bootx_dt_find_string(name);
+ if (data == NULL)
+ size = 0;
+ if (soff == 0) {
+ bootx_printf("WARNING: Can't find string index for <%s>\n",
+ name);
+ return;
+ }
+ if (size > 0x20000) {
+ bootx_printf("WARNING: ignoring large property ");
+ bootx_printf("%s length 0x%x\n", name, size);
+ return;
+ }
+ dt_push_token(OF_DT_PROP, mem_end);
+ dt_push_token(size, mem_end);
+ dt_push_token(soff, mem_end);
+
+ /* push property content */
+ if (size && data) {
+ memcpy((void *)*mem_end, data, size);
+ *mem_end = _ALIGN_UP(*mem_end + size, 4);
+ }
+}
+
+static void __init bootx_add_chosen_props(unsigned long base,
+ unsigned long *mem_end)
+{
+ u32 val = _MACH_Pmac;
+
+ bootx_dt_add_prop("linux,platform", &val, 4, mem_end);
+
+ if (bootx_info->kernelParamsOffset) {
+ char *args = (char *)((unsigned long)bootx_info) +
+ bootx_info->kernelParamsOffset;
+ bootx_dt_add_prop("bootargs", args, strlen(args) + 1, mem_end);
+ }
+ if (bootx_info->ramDisk) {
+ val = ((unsigned long)bootx_info) + bootx_info->ramDisk;
+ bootx_dt_add_prop("linux,initrd-start", &val, 4, mem_end);
+ val += bootx_info->ramDiskSize;
+ bootx_dt_add_prop("linux,initrd-end", &val, 4, mem_end);
+ }
+ if (strlen(bootx_disp_path))
+ bootx_dt_add_prop("linux,stdout-path", bootx_disp_path,
+ strlen(bootx_disp_path) + 1, mem_end);
+}
+
+static void __init bootx_add_display_props(unsigned long base,
+ unsigned long *mem_end)
+{
+ bootx_dt_add_prop("linux,boot-display", NULL, 0, mem_end);
+ bootx_dt_add_prop("linux,opened", NULL, 0, mem_end);
+}
+
+static void __init bootx_dt_add_string(char *s, unsigned long *mem_end)
+{
+ unsigned int l = strlen(s) + 1;
+ memcpy((void *)*mem_end, s, l);
+ bootx_dt_strend = *mem_end = *mem_end + l;
+}
+
+static void __init bootx_scan_dt_build_strings(unsigned long base,
+ unsigned long node,
+ unsigned long *mem_end)
+{
+ struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
+ u32 *cpp, *ppp = &np->properties;
+ unsigned long soff;
+ char *namep;
+
+ /* Keep refs to known nodes */
+ namep = np->full_name ? (char *)(base + np->full_name) : NULL;
+ if (namep == NULL) {
+ bootx_printf("Node without a full name !\n");
+ namep = "";
+ }
+ DBG("* strings: %s\n", namep);
+
+ if (!strcmp(namep, "/chosen")) {
+ DBG(" detected /chosen ! adding properties names !\n");
+ bootx_dt_add_string("linux,platform", mem_end);
+ bootx_dt_add_string("linux,stdout-path", mem_end);
+ bootx_dt_add_string("linux,initrd-start", mem_end);
+ bootx_dt_add_string("linux,initrd-end", mem_end);
+ bootx_dt_add_string("bootargs", mem_end);
+ bootx_node_chosen = node;
+ }
+ if (node == bootx_info->dispDeviceRegEntryOffset) {
+ DBG(" detected display ! adding properties names !\n");
+ bootx_dt_add_string("linux,boot-display", mem_end);
+ bootx_dt_add_string("linux,opened", mem_end);
+ strncpy(bootx_disp_path, namep, 255);
+ }
+
+ /* get and store all property names */
+ while (*ppp) {
+ struct bootx_dt_prop *pp =
+ (struct bootx_dt_prop *)(base + *ppp);
+
+ namep = pp->name ? (char *)(base + pp->name) : NULL;
+ if (namep == NULL || strcmp(namep, "name") == 0)
+ goto next;
+ /* get/create string entry */
+ soff = bootx_dt_find_string(namep);
+ if (soff == 0)
+ bootx_dt_add_string(namep, mem_end);
+ next:
+ ppp = &pp->next;
+ }
+
+ /* do all our children */
+ cpp = &np->child;
+ while(*cpp) {
+ np = (struct bootx_dt_node *)(base + *cpp);
+ bootx_scan_dt_build_strings(base, *cpp, mem_end);
+ cpp = &np->sibling;
+ }
+}
+
+static void __init bootx_scan_dt_build_struct(unsigned long base,
+ unsigned long node,
+ unsigned long *mem_end)
+{
+ struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
+ u32 *cpp, *ppp = &np->properties;
+ char *namep, *p, *ep, *lp;
+ int l;
+
+ dt_push_token(OF_DT_BEGIN_NODE, mem_end);
+
+ /* get the node's full name */
+ namep = np->full_name ? (char *)(base + np->full_name) : NULL;
+ if (namep == NULL)
+ namep = "";
+ l = strlen(namep);
+
+ DBG("* struct: %s\n", namep);
+
+ /* Fixup an Apple bug where they have bogus \0 chars in the
+ * middle of the path in some properties, and extract
+ * the unit name (everything after the last '/').
+ */
+ memcpy((void *)*mem_end, namep, l + 1);
+ namep = (char *)*mem_end;
+ for (lp = p = namep, ep = namep + l; p < ep; p++) {
+ if (*p == '/')
+ lp = namep;
+ else if (*p != 0)
+ *lp++ = *p;
+ }
+ *lp = 0;
+ *mem_end = _ALIGN_UP((unsigned long)lp + 1, 4);
+
+ /* get and store all properties */
+ while (*ppp) {
+ struct bootx_dt_prop *pp =
+ (struct bootx_dt_prop *)(base + *ppp);
+
+ namep = pp->name ? (char *)(base + pp->name) : NULL;
+ /* Skip "name" */
+ if (namep == NULL || !strcmp(namep, "name"))
+ goto next;
+ /* Skip "bootargs" in /chosen too as we replace it */
+ if (node == bootx_node_chosen && !strcmp(namep, "bootargs"))
+ goto next;
+
+ /* push property head */
+ bootx_dt_add_prop(namep,
+ pp->value ? (void *)(base + pp->value): NULL,
+ pp->length, mem_end);
+ next:
+ ppp = &pp->next;
+ }
+
+ if (node == bootx_node_chosen)
+ bootx_add_chosen_props(base, mem_end);
+ if (node == bootx_info->dispDeviceRegEntryOffset)
+ bootx_add_display_props(base, mem_end);
+
+ /* do all our children */
+ cpp = &np->child;
+ while(*cpp) {
+ np = (struct bootx_dt_node *)(base + *cpp);
+ bootx_scan_dt_build_struct(base, *cpp, mem_end);
+ cpp = &np->sibling;
+ }
+
+ dt_push_token(OF_DT_END_NODE, mem_end);
+}
+
+static unsigned long __init bootx_flatten_dt(unsigned long start)
+{
+ boot_infos_t *bi = bootx_info;
+ unsigned long mem_start, mem_end;
+ struct boot_param_header *hdr;
+ unsigned long base;
+ u64 *rsvmap;
+
+ /* Start using memory after the big blob passed by BootX, get
+ * some space for the header
+ */
+ mem_start = mem_end = _ALIGN_UP(((unsigned long)bi) + start, 4);
+ DBG("Boot params header at: %x\n", mem_start);
+ hdr = (struct boot_param_header *)mem_start;
+ mem_end += sizeof(struct boot_param_header);
+ rsvmap = (u64 *)(_ALIGN_UP(mem_end, 8));
+ hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - mem_start;
+ mem_end = ((unsigned long)rsvmap) + 8 * sizeof(u64);
+
+ /* Get base of tree */
+ base = ((unsigned long)bi) + bi->deviceTreeOffset;
+
+ /* Build string array */
+ DBG("Building string array at: %x\n", mem_end);
+ DBG("Device Tree Base=%x\n", base);
+ bootx_dt_strbase = mem_end;
+ mem_end += 4;
+ bootx_dt_strend = mem_end;
+ bootx_scan_dt_build_strings(base, 4, &mem_end);
+ hdr->off_dt_strings = bootx_dt_strbase - mem_start;
+ hdr->dt_strings_size = bootx_dt_strend - bootx_dt_strbase;
+
+ /* Build structure */
+ mem_end = _ALIGN(mem_end, 16);
+ DBG("Building device tree structure at: %x\n", mem_end);
+ hdr->off_dt_struct = mem_end - mem_start;
+ bootx_scan_dt_build_struct(base, 4, &mem_end);
+ dt_push_token(OF_DT_END, &mem_end);
+
+ /* Finish header */
+ hdr->boot_cpuid_phys = 0;
+ hdr->magic = OF_DT_HEADER;
+ hdr->totalsize = mem_end - mem_start;
+ hdr->version = OF_DT_VERSION;
+ /* Version 16 is not backward compatible */
+ hdr->last_comp_version = 0x10;
+
+ /* Reserve the whole thing and copy the reserve map in, we
+ * also bump mem_reserve_cnt to cause further reservations to
+ * fail since it's too late.
+ */
+ mem_end = _ALIGN(mem_end, PAGE_SIZE);
+ DBG("End of boot params: %x\n", mem_end);
+ rsvmap[0] = mem_start;
+ rsvmap[1] = mem_end;
+ rsvmap[2] = 0;
+ rsvmap[3] = 0;
+
+ return (unsigned long)hdr;
+}
+
+
+#ifdef CONFIG_BOOTX_TEXT
+static void __init btext_welcome(boot_infos_t *bi)
+{
+ unsigned long flags;
+ unsigned long pvr;
+
+ bootx_printf("Welcome to Linux, kernel " UTS_RELEASE "\n");
+ bootx_printf("\nlinked at : 0x%x", KERNELBASE);
+ bootx_printf("\nframe buffer at : 0x%x", bi->dispDeviceBase);
+ bootx_printf(" (phys), 0x%x", bi->logicalDisplayBase);
+ bootx_printf(" (log)");
+ bootx_printf("\nklimit : 0x%x",(unsigned long)klimit);
+ bootx_printf("\nboot_info at : 0x%x", bi);
+ __asm__ __volatile__ ("mfmsr %0" : "=r" (flags));
+ bootx_printf("\nMSR : 0x%x", flags);
+ __asm__ __volatile__ ("mfspr %0, 287" : "=r" (pvr));
+ bootx_printf("\nPVR : 0x%x", pvr);
+ pvr >>= 16;
+ if (pvr > 1) {
+ __asm__ __volatile__ ("mfspr %0, 1008" : "=r" (flags));
+ bootx_printf("\nHID0 : 0x%x", flags);
+ }
+ if (pvr == 8 || pvr == 12 || pvr == 0x800c) {
+ __asm__ __volatile__ ("mfspr %0, 1019" : "=r" (flags));
+ bootx_printf("\nICTC : 0x%x", flags);
+ }
+#ifdef DEBUG
+ bootx_printf("\n\n");
+ bootx_printf("bi->deviceTreeOffset : 0x%x\n",
+ bi->deviceTreeOffset);
+ bootx_printf("bi->deviceTreeSize : 0x%x\n",
+ bi->deviceTreeSize);
+#endif
+ bootx_printf("\n\n");
+}
+#endif /* CONFIG_BOOTX_TEXT */
+
+void __init bootx_init(unsigned long r3, unsigned long r4)
+{
+ boot_infos_t *bi = (boot_infos_t *) r4;
+ unsigned long hdr;
+ unsigned long space;
+ unsigned long ptr, x;
+ char *model;
+ unsigned long offset = reloc_offset();
+
+ reloc_got2(offset);
+
+ bootx_info = bi;
+
+ /* We haven't cleared any bss at this point, make sure
+ * what we need is initialized
+ */
+ bootx_dt_strbase = bootx_dt_strend = 0;
+ bootx_node_chosen = 0;
+ bootx_disp_path[0] = 0;
+
+ if (!BOOT_INFO_IS_V2_COMPATIBLE(bi))
+ bi->logicalDisplayBase = bi->dispDeviceBase;
+
+#ifdef CONFIG_BOOTX_TEXT
+ btext_setup_display(bi->dispDeviceRect[2] - bi->dispDeviceRect[0],
+ bi->dispDeviceRect[3] - bi->dispDeviceRect[1],
+ bi->dispDeviceDepth, bi->dispDeviceRowBytes,
+ (unsigned long)bi->logicalDisplayBase);
+ btext_clearscreen();
+ btext_flushscreen();
+#endif /* CONFIG_BOOTX_TEXT */
+
+ /*
+ * 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)) {
+ bootx_printf(" !!! WARNING - Incompatible version"
+ " of BootX !!!\n\n\n");
+ for (;;)
+ ;
+ }
+ if (bi->architecture != BOOT_ARCH_PCI) {
+ bootx_printf(" !!! WARNING - Usupported machine"
+ " architecture !\n");
+ for (;;)
+ ;
+ }
+
+#ifdef CONFIG_BOOTX_TEXT
+ btext_welcome(bi);
+#endif
+ /* 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 *) bootx_early_getprop(r4 + bi->deviceTreeOffset,
+ 4, "model");
+ if (model
+ && (strcmp(model, "iMac,1") == 0
+ || strcmp(model, "PowerMac1,1") == 0)) {
+ bootx_printf("iMac,1 detected, shutting down USB \n");
+ out_le32((unsigned *)0x80880008, 1); /* XXX */
+ }
+ }
+
+ /* Get a pointer that points above the device tree, args, ramdisk,
+ * etc... to use for generating the flattened tree
+ */
+ if (bi->version < 5) {
+ space = bi->deviceTreeOffset + bi->deviceTreeSize;
+ if (bi->ramDisk)
+ space = bi->ramDisk + bi->ramDiskSize;
+ } else
+ space = bi->totalParamsSize;
+
+ bootx_printf("Total space used by parameters & ramdisk: %x \n", 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) {
+ bootx_printf("Touching pages...\n");
+
+ /*
+ * 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;
+ }
+
+ /* Ok, now we need to generate a flattened device-tree to pass
+ * to the kernel
+ */
+ bootx_printf("Preparing boot params...\n");
+
+ hdr = bootx_flatten_dt(space);
+
+#ifdef CONFIG_BOOTX_TEXT
+#ifdef SET_BOOT_BAT
+ bootx_printf("Preparing BAT...\n");
+ btext_prepare_BAT();
+#else
+ btext_unmap();
+#endif
+#endif
+
+ reloc_got2(-offset);
+
+ __start(hdr, KERNELBASE + offset, 0);
+}
Index: linux-serialfix/arch/powerpc/kernel/head_32.S
===================================================================
--- linux-serialfix.orig/arch/powerpc/kernel/head_32.S 2005-11-23 16:54:25.000000000 +1100
+++ linux-serialfix/arch/powerpc/kernel/head_32.S 2005-11-23 16:54:26.000000000 +1100
@@ -125,6 +125,19 @@ __start:
bl prom_init
trap
+/*
+ * Check for BootX signature when supporting PowerMac and branch to
+ * appropriate trampoline if it's present
+ */
+#ifdef CONFIG_PPC_PMAC
+1: lis r31,0x426f
+ ori r31,r31,0x6f58
+ cmpw 0,r3,r31
+ bne 1f
+ bl bootx_init
+ trap
+#endif /* CONFIG_PPC_PMAC */
+
1: mr r31,r3 /* save parameters */
mr r30,r4
li r24,0 /* cpu # */
Index: linux-serialfix/arch/powerpc/platforms/powermac/Makefile
===================================================================
--- linux-serialfix.orig/arch/powerpc/platforms/powermac/Makefile 2005-11-23 16:54:25.000000000 +1100
+++ linux-serialfix/arch/powerpc/platforms/powermac/Makefile 2005-11-23 16:54:26.000000000 +1100
@@ -1,3 +1,5 @@
+CFLAGS_bootx_init.o += -fPIC
+
obj-y += pic.o setup.o time.o feature.o pci.o \
sleep.o low_i2c.o cache.o
obj-$(CONFIG_PMAC_BACKLIGHT) += backlight.o
@@ -6,5 +8,6 @@ obj-$(CONFIG_CPU_FREQ_PMAC64) += cpufreq
obj-$(CONFIG_NVRAM) += nvram.o
# ppc64 pmac doesn't define CONFIG_NVRAM but needs nvram stuff
obj-$(CONFIG_PPC64) += nvram.o
+obj-$(CONFIG_PPC32) += bootx_init.o
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_PPC_MERGE) += udbg_scc.o udbg_adb.o
Index: linux-serialfix/include/asm-powerpc/bootx.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-serialfix/include/asm-powerpc/bootx.h 2005-11-23 16:54:26.000000000 +1100
@@ -0,0 +1,166 @@
+/*
+ * This file describes the structure passed from the BootX application
+ * (for MacOS) when it is used to boot Linux.
+ *
+ * Written by Benjamin Herrenschmidt.
+ */
+
+
+#ifndef __ASM_BOOTX_H__
+#define __ASM_BOOTX_H__
+
+#ifdef macintosh
+#include <Types.h>
+#include "linux_type_defs.h"
+#endif
+
+#ifdef macintosh
+/* All this requires PowerPC alignment */
+#pragma options align=power
+#endif
+
+/* On kernel entry:
+ *
+ * r3 = 0x426f6f58 ('BooX')
+ * r4 = pointer to boot_infos
+ * r5 = NULL
+ *
+ * Data and instruction translation disabled, interrupts
+ * disabled, kernel loaded at physical 0x00000000 on PCI
+ * machines (will be different on NuBus).
+ */
+
+#define BOOT_INFO_VERSION 5
+#define BOOT_INFO_COMPATIBLE_VERSION 1
+
+/* Bit in the architecture flag mask. More to be defined in
+ future versions. Note that either BOOT_ARCH_PCI or
+ BOOT_ARCH_NUBUS is set. The other BOOT_ARCH_NUBUS_xxx are
+ set additionally when BOOT_ARCH_NUBUS is set.
+ */
+#define BOOT_ARCH_PCI 0x00000001UL
+#define BOOT_ARCH_NUBUS 0x00000002UL
+#define BOOT_ARCH_NUBUS_PDM 0x00000010UL
+#define BOOT_ARCH_NUBUS_PERFORMA 0x00000020UL
+#define BOOT_ARCH_NUBUS_POWERBOOK 0x00000040UL
+
+/* Maximum number of ranges in phys memory map */
+#define MAX_MEM_MAP_SIZE 26
+
+/* This is the format of an element in the physical memory map. Note that
+ the map is optional and current BootX will only build it for pre-PCI
+ machines */
+typedef struct boot_info_map_entry
+{
+ __u32 physAddr; /* Physical starting address */
+ __u32 size; /* Size in bytes */
+} boot_info_map_entry_t;
+
+
+/* Here are the boot informations that are passed to the bootstrap
+ * Note that the kernel arguments and the device tree are appended
+ * at the end of this structure. */
+typedef struct boot_infos
+{
+ /* Version of this structure */
+ __u32 version;
+ /* backward compatible down to version: */
+ __u32 compatible_version;
+
+ /* NEW (vers. 2) this holds the current _logical_ base addr of
+ the frame buffer (for use by early boot message) */
+ __u8* logicalDisplayBase;
+
+ /* NEW (vers. 4) Apple's machine identification */
+ __u32 machineID;
+
+ /* NEW (vers. 4) Detected hw architecture */
+ __u32 architecture;
+
+ /* The device tree (internal addresses relative to the beginning of the tree,
+ * device tree offset relative to the beginning of this structure).
+ * On pre-PCI macintosh (BOOT_ARCH_PCI bit set to 0 in architecture), this
+ * field is 0.
+ */
+ __u32 deviceTreeOffset; /* Device tree offset */
+ __u32 deviceTreeSize; /* Size of the device tree */
+
+ /* Some infos about the current MacOS display */
+ __u32 dispDeviceRect[4]; /* left,top,right,bottom */
+ __u32 dispDeviceDepth; /* (8, 16 or 32) */
+ __u8* dispDeviceBase; /* base address (physical) */
+ __u32 dispDeviceRowBytes; /* rowbytes (in bytes) */
+ __u32 dispDeviceColorsOffset; /* Colormap (8 bits only) or 0 (*) */
+ /* Optional offset in the registry to the current
+ * MacOS display. (Can be 0 when not detected) */
+ __u32 dispDeviceRegEntryOffset;
+
+ /* Optional pointer to boot ramdisk (offset from this structure) */
+ __u32 ramDisk;
+ __u32 ramDiskSize; /* size of ramdisk image */
+
+ /* Kernel command line arguments (offset from this structure) */
+ __u32 kernelParamsOffset;
+
+ /* ALL BELOW NEW (vers. 4) */
+
+ /* This defines the physical memory. Valid with BOOT_ARCH_NUBUS flag
+ (non-PCI) only. On PCI, memory is contiguous and it's size is in the
+ device-tree. */
+ boot_info_map_entry_t
+ physMemoryMap[MAX_MEM_MAP_SIZE]; /* Where the phys memory is */
+ __u32 physMemoryMapSize; /* How many entries in map */
+
+
+ /* The framebuffer size (optional, currently 0) */
+ __u32 frameBufferSize; /* Represents a max size, can be 0. */
+
+ /* NEW (vers. 5) */
+
+ /* Total params size (args + colormap + device tree + ramdisk) */
+ __u32 totalParamsSize;
+
+} boot_infos_t;
+
+/* (*) The format of the colormap is 256 * 3 * 2 bytes. Each color index
+ * is represented by 3 short words containing a 16 bits (unsigned) color
+ * component. Later versions may contain the gamma table for direct-color
+ * devices here.
+ */
+#define BOOTX_COLORTABLE_SIZE (256UL*3UL*2UL)
+
+/* BootX passes the device-tree using a format that comes from earlier
+ * ppc32 kernels. This used to match what is in prom.h, but not anymore
+ * so we now define it here
+ */
+struct bootx_dt_prop {
+ u32 name;
+ int length;
+ u32 value;
+ u32 next;
+};
+
+struct bootx_dt_node {
+ u32 unused0;
+ u32 unused1;
+ u32 phandle; /* not really available */
+ u32 unused2;
+ u32 unused3;
+ u32 unused4;
+ u32 unused5;
+ u32 full_name;
+ u32 properties;
+ u32 parent;
+ u32 child;
+ u32 sibling;
+ u32 next;
+ u32 allnext;
+};
+
+extern void bootx_init(unsigned long r4, unsigned long phys);
+
+#ifdef macintosh
+#pragma options align=reset
+#endif
+
+#endif
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