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yaboot.c

/*
 *  Yaboot - secondary boot loader for Linux on PowerPC. 
 *
 *  Copyright (C) 2001, 2002 Ethan Benson
 *
 *  Copyright (C) 1999, 2000, 2001 Benjamin Herrenschmidt
 *  
 *  IBM CHRP support
 *  
 *  Copyright (C) 2001 Peter Bergner
 *
 *  portions based on poof
 *  
 *  Copyright (C) 1999 Marius Vollmer
 *  
 *  portions based on quik
 *  
 *  Copyright (C) 1996 Paul Mackerras.
 *  
 *  Because this program is derived from the corresponding file in the
 *  silo-0.64 distribution, it is also
 *  
 *  Copyright (C) 1996 Pete A. Zaitcev
 *                1996 Maurizio Plaza
 *                1996 David S. Miller
 *                1996 Miguel de Icaza
 *                1996 Jakub Jelinek
 *
 *  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.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include "stdarg.h"
#include "string.h"
#include "ctype.h"
#include "stdlib.h"
#include "prom.h"
#include "file.h"
#include "errors.h"
#include "cfg.h"
#include "cmdline.h"
#include "yaboot.h"
#include "linux/elf.h"
#include "bootinfo.h"
#include "debug.h"

#define CONFIG_FILE_NAME      "yaboot.conf"
#define CONFIG_FILE_MAX       0x8000            /* 32k */

#ifdef USE_MD5_PASSWORDS
#include "md5.h"
#endif /* USE_MD5_PASSWORDS */

/* align addr on a size boundry - adjust address up if needed -- Cort */
#define _ALIGN(addr,size)     (((addr)+size-1)&(~(size-1)))

/* Addresses where the PPC32 and PPC64 vmlinux kernels are linked at.
 * These are used to determine whether we are booting a vmlinux, in
 * which case, it will be loaded at KERNELADDR.  Otherwise (eg zImage),
 * we load the binary where it was linked at (ie, e_entry field in
 * the ELF header).
 */
#define KERNEL_LINK_ADDR_PPC32      0xC0000000UL
#define KERNEL_LINK_ADDR_PPC64      0xC000000000000000ULL

typedef struct {
     union {
        Elf32_Ehdr  elf32hdr;
        Elf64_Ehdr  elf64hdr;
     } elf;
     void*      base;
     unsigned long   memsize;
     unsigned long   filesize;
     unsigned long   offset;
     unsigned long   load_loc;
     unsigned long   entry;
} loadinfo_t;

typedef void (*kernel_entry_t)( void *,
                                unsigned long,
                                prom_entry,
                                unsigned long,
                                unsigned long );

/* Imported functions */
extern unsigned long reloc_offset(void);
extern long flush_icache_range(unsigned long start, unsigned long stop);

/* Exported functions */
int   yaboot_start(unsigned long r3, unsigned long r4, unsigned long r5);

/* Local functions */
static int  yaboot_main(void);
static int  is_elf32(loadinfo_t *loadinfo);
static int  is_elf64(loadinfo_t *loadinfo);
static int      load_elf32(struct boot_file_t *file, loadinfo_t *loadinfo);
static int      load_elf64(struct boot_file_t *file, loadinfo_t *loadinfo);
static void     setup_display(void);

/* Locals & globals */

int useconf = 0;
char bootdevice[1024];
char *password = NULL;
struct boot_fspec_t boot;
int _machine = _MACH_Pmac;
int flat_vmlinux;

#ifdef CONFIG_COLOR_TEXT

/* Color values for text ui */
static struct ansi_color_t {
     char*  name;
     int    index;
     int    value;
} ansi_color_table[] = {
     { "black",         2, 30 },
     { "blue",          0, 31 },
     { "green",         0, 32 },
     { "cyan",          0, 33 },
     { "red",           0, 34 },
     { "purple",        0, 35 },
     { "brown",         0, 36 },
     { "light-gray",    0, 37 },
     { "dark-gray",           1, 30 },
     { "light-blue",          1, 31 },
     { "light-green",   1, 32 },
     { "light-cyan",          1, 33 },
     { "light-red",           1, 34 },
     { "light-purple",  1, 35 },
     { "yellow",        1, 36 },
     { "white",         1, 37 },
     { NULL,                  0, 0 },
};

/* Default colors for text ui */
int fgcolor = 15;
int bgcolor = 0;
#endif /* CONFIG_COLOR_TEXT */

#if DEBUG
static int test_bss;
static int test_data = 0;
#endif
static int pause_after;
static char *pause_message = "Type go<return> to continue.\n";
static char given_bootargs[1024];
static int given_bootargs_by_user = 0;

extern unsigned char linux_logo_red[];
extern unsigned char linux_logo_green[];
extern unsigned char linux_logo_blue[];

#define DEFAULT_TIMEOUT       -1

/* Entry, currently called directly by crt0 (bss not inited) */

extern char* __bss_start;
extern char* _end;

static struct first_info *quik_fip = NULL;

int
yaboot_start (unsigned long r3, unsigned long r4, unsigned long r5)
{
     int result;
     void* malloc_base = NULL;
     prom_handle root;

     /* OF seems to do it, but I'm not very confident */
     memset(&__bss_start, 0, &_end - &__bss_start);
      
     /* Check for quik first stage bootloader (but I don't think we are
      * compatible with it anyway, I'll look into backporting to older OF
      * versions later
      */
     if (r5 == 0xdeadbeef) {
        r5 = r3;
        quik_fip = (struct first_info *)r4;
     }

     /* Initialize OF interface */
     prom_init ((prom_entry) r5);
      
     /* Allocate some memory for malloc'ator */
     malloc_base = prom_claim((void *)MALLOCADDR, MALLOCSIZE, 0);
     if (malloc_base == (void *)-1) {
        prom_printf("Can't claim malloc buffer (%d bytes at 0x%08x)\n",
                  MALLOCSIZE, MALLOCADDR);
        return -1;
     }
     malloc_init(malloc_base, MALLOCSIZE);
     DEBUG_F("Malloc buffer allocated at %p (%d bytes)\n",
           malloc_base, MALLOCSIZE);
            
     /* A few useless DEBUG_F's */
     DEBUG_F("reloc_offset :  %ld         (should be 0)\n", reloc_offset());
     DEBUG_F("test_bss     :  %d         (should be 0)\n", test_bss);
     DEBUG_F("test_data    :  %d         (should be 0)\n", test_data);
     DEBUG_F("&test_data   :  %p\n", &test_data);
     DEBUG_F("&test_bss    :  %p\n", &test_bss);
     DEBUG_F("linked at    :  0x%08x\n", TEXTADDR);

     /* ask the OF info if we're a chrp or pmac */
     /* we need to set _machine before calling finish_device_tree */
     root = prom_finddevice("/");
     if (root != 0) {
        static char model[256];
        if (prom_getprop(root, "device_type", model, 256 ) > 0 &&
            !strncmp("chrp", model, 4))
             _machine = _MACH_chrp;
        else {
             if (prom_getprop(root, "model", model, 256 ) > 0 &&
               !strncmp(model, "IBM", 3))
                _machine = _MACH_chrp;
        }
     }
      
     DEBUG_F("Running on _machine = %d\n", _machine);
     DEBUG_SLEEP;

     /* Call out main */
     result = yaboot_main();

     /* Get rid of malloc pool */
     malloc_dispose();
     prom_release(malloc_base, MALLOCSIZE);
     DEBUG_F("Malloc buffer released. Exiting with code %d\n",
           result);

     /* Return to OF */
     prom_exit();
      
     return result;
      
}

#ifdef CONFIG_COLOR_TEXT
/*
 * Validify color for text ui
 */
static int
check_color_text_ui(char *color)
{
     int i = 0;
     while(ansi_color_table[i].name) {
        if (!strcmp(color, ansi_color_table[i].name))
             return i;
        i++;
     }
     return -1;
}      
#endif /* CONFIG_COLOR_TEXT */


void print_message_file(char *filename)
{
     char *msg = NULL; 
     char *p, *endp;
     char *defdev = boot.dev;
     int defpart = boot.part;
     char msgpath[1024];
     int opened = 0;
     int result = 0;
     int n;
     struct boot_file_t file;
     struct boot_fspec_t msgfile;

     defdev = cfg_get_strg(0, "device");
     if (!defdev)
        defdev = boot.dev;
     p = cfg_get_strg(0, "partition");
        if (p) {
             n = simple_strtol(p, &endp, 10);
             if (endp != p && *endp == 0)
                defpart = n;         
        }

     strncpy(msgpath, filename, sizeof(msgpath));
     if (!parse_device_path(msgpath, defdev, defpart, "/etc/yaboot.msg", &msgfile)) {
        prom_printf("%s: Unable to parse\n", msgpath);
        goto done;
     }

     result = open_file(&msgfile, &file);
     if (result != FILE_ERR_OK) {
        prom_printf("%s:%d,", msgfile.dev, msgfile.part);
        prom_perror(result, msgfile.file);
        goto done;
     } else
        opened = 1;

     msg = malloc(2001);
     if (!msg)
        goto done;
     else
        memset(msg, 0, 2001);

     if (file.fs->read(&file, 2000, msg) <= 0)
        goto done;
     else
        prom_printf("%s", msg);

done:
     if (opened)
        file.fs->close(&file);
     if (msg)
        free(msg);
}

/* Currently, the config file must be at the root of the filesystem.
 * todo: recognize the full path to myself and use it to load the
 * config file. Handle the "\\" (blessed system folder)
 */
static int
load_config_file(char *device, char* path, int partition)
{
     char *conf_file = NULL, *p;
     struct boot_file_t file;
     int sz, opened = 0, result = 0;
     char conf_path[512];
     struct boot_fspec_t fspec;

     /* Allocate a buffer for the config file */
     conf_file = malloc(CONFIG_FILE_MAX);
     if (!conf_file) {
        prom_printf("Can't alloc config file buffer\n");
        goto bail;
     }

     /* Build the path to the file */
     if (_machine == _MACH_chrp)
        strcpy(conf_path, "/etc/");
     else if (path && *path)
        strcpy(conf_path, path);
     else
        conf_path[0] = 0;
     strcat(conf_path, CONFIG_FILE_NAME);

     /* Open it */
     fspec.dev = device;
     fspec.file = conf_path;
     fspec.part = partition;
     result = open_file(&fspec, &file);
     if (result != FILE_ERR_OK) {
        prom_printf("%s:%d,", fspec.dev, fspec.part);
        prom_perror(result, fspec.file);
        prom_printf("Can't open config file\n");
        goto bail;
     }
     opened = 1;

     /* Read it */
     sz = file.fs->read(&file, CONFIG_FILE_MAX, conf_file);
     if (sz <= 0) {
        prom_printf("Error, can't read config file\n");
        goto bail;
     }
     prom_printf("Config file read, %d bytes\n", sz);

     /* Close the file */
     if (opened)
        file.fs->close(&file);
     opened = 0;

     /* Call the parsing code in cfg.c */
     if (cfg_parse(conf_path, conf_file, sz) < 0) {
        prom_printf ("Syntax error or read error config\n");
        goto bail;
     }

     DEBUG_F("Config file successfully parsed, %d bytes\n", sz);

     /* Now, we do the initialisations stored in the config file */
     p = cfg_get_strg(0, "init-code");
     if (p)
        prom_interpret(p);

     password = cfg_get_strg(0, "password");
      
#ifdef CONFIG_COLOR_TEXT
     p = cfg_get_strg(0, "fgcolor");
     if (p) {
        DEBUG_F("fgcolor=%s\n", p);
        fgcolor = check_color_text_ui(p);
        if (fgcolor == -1) {
             prom_printf("Invalid fgcolor: \"%s\".\n", p);
        }
     }
     p = cfg_get_strg(0, "bgcolor");
     if (p) {
        DEBUG_F("bgcolor=%s\n", p);
        bgcolor = check_color_text_ui(p);
        if (bgcolor == -1)
             prom_printf("Invalid bgcolor: \"%s\".\n", p);
     }
     if (bgcolor >= 0) {
        char temp[64];
        sprintf(temp, "%x to background-color", bgcolor); 
        prom_interpret(temp); 
#if !DEBUG
        prom_printf("\xc");
#endif /* !DEBUG */
     }
     if (fgcolor >= 0) {
        char temp[64];
        sprintf(temp, "%x to foreground-color", fgcolor); 
        prom_interpret(temp); 
     }
#endif /* CONFIG_COLOR_TEXT */
   
     p = cfg_get_strg(0, "init-message");
     if (p)
        prom_printf("%s\n", p);

     p = cfg_get_strg(0, "message");
     if (p)
        print_message_file(p);

     result = 1;
    
bail:

     if (opened)
        file.fs->close(&file);
    
     if (result != 1 && conf_file)
        free(conf_file);
      
     return result;
}

void maintabfunc (void)
{
     if (useconf) {
        cfg_print_images();
        prom_printf("boot: %s", cbuff);
     }
}

void
word_split(char **linep, char **paramsp)
{
     char *p;

     *paramsp = 0;
     p = *linep;
     if (p == 0)
        return;
     while (*p == ' ')
        ++p;
     if (*p == 0) {
        *linep = 0;
        return;
     }
     *linep = p;
     while (*p != 0 && *p != ' ')
        ++p;
     while (*p == ' ')
        *p++ = 0;
     if (*p != 0)
        *paramsp = p;
}

char *
make_params(char *label, char *params)
{
     char *p, *q;
     static char buffer[2048];

     q = buffer;
     *q = 0;

     p = cfg_get_strg(label, "literal");
     if (p) {
        strcpy(q, p);
        q = strchr(q, 0);
        if (params) {
             if (*p)
                *q++ = ' ';
             strcpy(q, params);
        }
        return buffer;
     }

     p = cfg_get_strg(label, "root");
     if (p) {
        strcpy (q, "root=");
        strcpy (q + 5, p);
        q = strchr (q, 0);
        *q++ = ' ';
     }
     if (cfg_get_flag(label, "read-only")) {
        strcpy (q, "ro ");
        q += 3;
     }
     if (cfg_get_flag(label, "read-write")) {
        strcpy (q, "rw ");
        q += 3;
     }
     p = cfg_get_strg(label, "ramdisk");
     if (p) {
        strcpy (q, "ramdisk=");
        strcpy (q + 8, p);
        q = strchr (q, 0);
        *q++ = ' ';
     }
     p = cfg_get_strg(label, "initrd-size");
     if (p) {
        strcpy (q, "ramdisk_size=");
        strcpy (q + 13, p);
        q = strchr (q, 0);
        *q++ = ' ';
     }
     if (cfg_get_flag(label, "novideo")) {
        strcpy (q, "video=ofonly");
        q = strchr (q, 0);
        *q++ = ' ';
     }
     p = cfg_get_strg (label, "append");
     if (p) {
        strcpy (q, p);
        q = strchr (q, 0);
        *q++ = ' ';
     }
     *q = 0;
     pause_after = cfg_get_flag (label, "pause-after");
     p = cfg_get_strg(label, "pause-message");
     if (p)
        pause_message = p;
     if (params)
        strcpy(q, params);

     return buffer;
}

void check_password(char *str)
{
     int i;

     prom_printf("\n%s", str);
     for (i = 0; i < 3; i++) {
        prom_printf ("\nPassword: ");
        passwdbuff[0] = 0;
        cmdedit ((void (*)(void)) 0, 1);
        prom_printf ("\n");
#ifdef USE_MD5_PASSWORDS
        if (!strncmp (password, "$1$", 3)) {
             if (!check_md5_password(passwdbuff, password))
                return;
        } 
        else if (!strcmp (password, passwdbuff))
             return;
#else /* !MD5 */
        if (!strcmp (password, passwdbuff))
             return;
#endif /* USE_MD5_PASSWORDS */
        if (i < 2) {
             prom_sleep(1);
             prom_printf ("Incorrect password.  Try again.");
        }
     }
     prom_printf(" ___________________\n< Permission denied >\n -------------------\n"
             "        \\   ^__^\n         \\  (oo)\\_______\n            (__)\\       )\\/\\\n"
             "                ||----w |\n                ||     ||\n");
     prom_sleep(4);
     prom_interpret("reset-all");
}

int get_params(struct boot_param_t* params)
{
     int defpart;
     char *defdevice = 0;
     char *p, *q, *endp;
     int c, n;
     char *imagename = 0, *label;
     int timeout = -1;
     int beg = 0, end;
     int singlekey = 0;
     int restricted = 0;
     static int first = 1;
     static char bootargs[1024];
     static char imagepath[1024];
     static char initrdpath[1024];
     static char sysmappath[1024];

     pause_after = 0;
     memset(params, 0, sizeof(*params));
     params->args = "";
     params->kernel.part = -1;
     params->rd.part = -1;
     params->sysmap.part = -1;
     defpart = boot.part;
    
     cmdinit();

     if (first) {
        first = 0;
        prom_get_chosen("bootargs", bootargs, sizeof(bootargs));
        imagename = bootargs;
        word_split(&imagename, &params->args);
        timeout = DEFAULT_TIMEOUT;
        if (imagename) {
             prom_printf("Default supplied on the command line: %s ", imagename);
             if (params->args)
                prom_printf("%s", params->args);
             prom_printf("\n");
        }
        if (useconf && (q = cfg_get_strg(0, "timeout")) != 0 && *q != 0)
             timeout = simple_strtol(q, NULL, 0);
     }

     prom_printf("boot: ");
     c = -1;
     if (timeout != -1) {
        beg = prom_getms();
        if (timeout > 0) {
             end = beg + 100 * timeout;
             do {
                c = prom_nbgetchar();
             } while (c == -1 && prom_getms() <= end);
        }
        if (c == -1)
             c = '\n';
        else if (c != '\n' && c != '\t' && c != '\r' && c != '\b' ) {
             cbuff[0] = c;
             cbuff[1] = 0;
        }
     }

     if (c != -1 && c != '\n' && c != '\r') {
        if (c == '\t') {
             maintabfunc ();
        }  else if (c >= ' ') {
             cbuff[0] = c;
             cbuff[1] = 0;
             if ((cfg_get_flag (cbuff, "single-key")) && useconf) {
                imagename = cbuff;
                singlekey = 1;
                prom_printf("%s\n", cbuff);
             }
        }
     }

     if (c == '\n' || c == '\r') {
        if (!imagename)
             imagename = cfg_get_default();
        if (imagename)
             prom_printf("%s", imagename);
        if (params->args)
             prom_printf(" %s", params->args);
        prom_printf("\n");
     } else if (!singlekey) {
        cmdedit(maintabfunc, 0);
        prom_printf("\n");
        strcpy(given_bootargs, cbuff);
        given_bootargs_by_user = 1;
        imagename = cbuff;
        word_split(&imagename, &params->args);
     }

     /* chrp gets this wrong, force it -- Cort */
     if ( useconf && (!imagename || imagename[0] == 0 ))
        imagename = cfg_get_default();

     label = 0;
     defdevice = boot.dev;

     if (useconf) {
        defdevice = cfg_get_strg(0, "device");
        p = cfg_get_strg(0, "partition");
        if (p) {
             n = simple_strtol(p, &endp, 10);
             if (endp != p && *endp == 0)
                defpart = n;
        }
        p = cfg_get_strg(0, "pause-message");
        if (p)
             pause_message = p;
        if (cfg_get_flag(0, "restricted"))
             restricted = 1;
        p = cfg_get_strg(imagename, "image");
        if (p && *p) {
             label = imagename;
             imagename = p;
             defdevice = cfg_get_strg(label, "device");
             if(!defdevice) defdevice=boot.dev;
             p = cfg_get_strg(label, "partition");
             if (p) {
                n = simple_strtol(p, &endp, 10);
                if (endp != p && *endp == 0)
                   defpart = n;
             }
             if (cfg_get_flag(label, "restricted"))
                restricted = 1;
             if (label) {
                if (params->args && password && restricted)
                   check_password ("To specify arguments for this image "
                               "you must enter the password.");
                else if (password && !restricted)
                   check_password ("This image is restricted.");
             }
             params->args = make_params(label, params->args);
        }
     }

     if (!strcmp (imagename, "help")) {
          /* FIXME: defdevice shouldn't need to be reset all over the place */
        if(!defdevice) defdevice = boot.dev;
        prom_printf(
             "\nPress the tab key for a list of defined images.\n"
             "The label marked with a \"*\" is is the default image, "
             "press <return> to boot it.\n\n"
             "To boot any other label simply type its name and press <return>.\n\n"
             "To boot a kernel image which is not defined in the yaboot configuration \n"
             "file, enter the kernel image name as [[device:][partno],]/path, where \n"
             "\"device:\" is the OpenFirmware device path to the disk the image \n"
             "resides on, and \"partno\" is the partition number the image resides on.\n"
             "Note that the comma (,) is only required if you specify an OpenFirmware\n"
             "device, if you only specify a filename you should not start it with a \",\"\n\n"
             "If you omit \"device:\" and \"partno\" yaboot will use the values of \n"
             "\"device=\" and \"partition=\" in yaboot.conf, right now those are set to: \n"
             "device=%s\n"
             "partition=%d\n\n", defdevice, defpart);
        return 0;
     }

     if (!strcmp (imagename, "halt")) {
        if (password)
             check_password ("Restricted command.");
        prom_pause();
        return 0;
     }
     if (!strcmp (imagename, "bye")) {
        if (password) {
             check_password ("Restricted command.");
             return 1;
        }
        return 1; 
     }

     if (imagename[0] == '$') {
        /* forth command string */
        if (password)
             check_password ("OpenFirmware commands are restricted.");
        prom_interpret(imagename+1);
        return 0;
     }

     strncpy(imagepath, imagename, 1024);

     if (!label && password)
        check_password ("To boot a custom image you must enter the password.");

     if (!parse_device_path(imagepath, defdevice, defpart,
                      "/vmlinux", &params->kernel)) {
        prom_printf("%s: Unable to parse\n", imagepath);
        return 0;
     }
     DEBUG_F("after parse_device_path: dev=%s part=%d file=%s\n", params->kernel.dev,
           params->kernel.part, params->kernel.file);

     if (useconf) {
        p = cfg_get_strg(label, "initrd");
        if (p && *p) {
             DEBUG_F("Parsing initrd path <%s>\n", p);
             strncpy(initrdpath, p, 1024);
             if (!parse_device_path(initrdpath, defdevice, defpart,
                              "/root.bin", &params->rd)) {
                prom_printf("%s: Unable to parse\n", imagepath);
                return 0;
             }
        }
        p = cfg_get_strg(label, "sysmap");
        if (p && *p) {
             DEBUG_F("Parsing sysmap path <%s>\n", p);
             strncpy(sysmappath, p, 1024);
             if (!parse_device_path(sysmappath, defdevice, defpart,
                              "/boot/System.map", &params->sysmap)) {
                prom_printf("%s: Unable to parse\n", imagepath);
                return 0;
             }
        }
     }
     return 0;
}

/* This is derived from quik core. To be changed to first parse the headers
 * doing lazy-loading, and then claim the memory before loading the kernel
 * to it
 * We also need to add initrd support to this whole mecanism
 */
void
yaboot_text_ui(void)
{
#define MAX_HEADERS     32

     struct boot_file_t file;
     int                result;
     static struct boot_param_t     params;
     void         *initrd_base;
     unsigned long      initrd_size;
     void                *sysmap_base;
     unsigned long      sysmap_size;
     kernel_entry_t      kernel_entry;
     struct bi_record*  birec;
     char*               loc=NULL;
     loadinfo_t          loadinfo;
     void                *initrd_more,*initrd_want;
     unsigned long       initrd_read;
    
     loadinfo.load_loc = 0;

     for (;;) {
        initrd_size = 0;
        initrd_base = 0;
        sysmap_base = 0;
        sysmap_size = 0;
      
        if (get_params(&params))
             return;
        if (!params.kernel.file)
             continue;
      
        prom_printf("Please wait, loading kernel...\n");

        memset(&file, 0, sizeof(file));

        if (strlen(boot.file) && !strcmp(boot.file,"\\\\") && params.kernel.file[0] != '/'
            && params.kernel.file[0] != '\\') {
             loc=(char*)malloc(strlen(params.kernel.file)+3);
             if (!loc) {
                prom_printf ("malloc error\n");
                goto next;
             }
             strcpy(loc,boot.file);
             strcat(loc,params.kernel.file);
             free(params.kernel.file);
             params.kernel.file=loc;
        }
        result = open_file(&params.kernel, &file);
        if (result != FILE_ERR_OK) {
             prom_printf("%s:%d,", params.kernel.dev, params.kernel.part);
             prom_perror(result, params.kernel.file);
             goto next;
        }

        /* Read the Elf e_ident, e_type and e_machine fields to
         * determine Elf file type
         */
        if (file.fs->read(&file, sizeof(Elf_Ident), &loadinfo.elf) < sizeof(Elf_Ident)) {
             prom_printf("\nCan't read Elf e_ident/e_type/e_machine info\n");
             file.fs->close(&file);
             memset(&file, 0, sizeof(file));
             goto next;
        }

        if (is_elf32(&loadinfo)) {
             if (!load_elf32(&file, &loadinfo)) {
                file.fs->close(&file);
                memset(&file, 0, sizeof(file));
                goto next;
             }
             prom_printf("   Elf32 kernel loaded...\n");
        } else if (is_elf64(&loadinfo)) {
             if (!load_elf64(&file, &loadinfo)) {
                file.fs->close(&file);
                memset(&file, 0, sizeof(file));
                goto next;
             }
             prom_printf("   Elf64 kernel loaded...\n");
        } else {
             prom_printf ("%s: Not a valid ELF image\n", params.kernel.file);
             file.fs->close(&file);
             memset(&file, 0, sizeof(file));
             goto next;
        }
        file.fs->close(&file);
        memset(&file, 0, sizeof(file));

        /* If sysmap, load it (only if booting a vmlinux).
         */
        if (flat_vmlinux && params.sysmap.file) {
             prom_printf("Loading System.map ...\n");
             if(strlen(boot.file) && !strcmp(boot.file,"\\\\") && params.sysmap.file[0] != '/'
              && params.sysmap.file[0] != '\\') {
                if (loc) free(loc);
                loc=(char*)malloc(strlen(params.sysmap.file)+3);
                if (!loc) {
                   prom_printf ("malloc error\n");
                   goto next;
                }
                strcpy(loc,boot.file);
                strcat(loc,params.sysmap.file);
                free(params.sysmap.file);
                params.sysmap.file=loc;
             }
           
             result = open_file(&params.sysmap, &file);
             if (result != FILE_ERR_OK) {
                prom_printf("%s:%d,", params.sysmap.dev, params.sysmap.part);
                prom_perror(result, params.sysmap.file);
             }
             else {
                sysmap_base = prom_claim(loadinfo.base+loadinfo.memsize, 0x100000, 0);
                if (sysmap_base == (void *)-1) {
                   prom_printf("Claim failed for sysmap memory\n");
                   sysmap_base = 0;
                } else {
                   sysmap_size = file.fs->read(&file, 0xfffff, sysmap_base);
                   if (sysmap_size == 0)
                        sysmap_base = 0;
                   else
                        ((char *)sysmap_base)[sysmap_size++] = 0;
                }
                file.fs->close(&file);
                memset(&file, 0, sizeof(file));
             }
             if (sysmap_base) {
                prom_printf("System.map loaded at %p, size: %lu Kbytes\n",
                        sysmap_base, sysmap_size >> 10);
                loadinfo.memsize += _ALIGN(0x100000, 0x1000);
             } else {
                prom_printf("System.map load failed !\n");
                prom_pause();
             }
        }

        /* If ramdisk, load it (only if booting a vmlinux).  For now, we
         * can't tell the size it will be so we claim an arbitrary amount
         * of 4Mb.
         */
        if (flat_vmlinux && params.rd.file) {
             if(strlen(boot.file) && !strcmp(boot.file,"\\\\") && params.rd.file[0] != '/'
              && params.kernel.file[0] != '\\')
             {
                if (loc) free(loc);
                loc=(char*)malloc(strlen(params.rd.file)+3);
                if (!loc) {
                   prom_printf ("Malloc error\n");
                   goto next;
                }
                strcpy(loc,boot.file);
                strcat(loc,params.rd.file);
                free(params.rd.file);
                params.rd.file=loc;
             }
             prom_printf("Loading ramdisk...\n");
             result = open_file(&params.rd, &file);
             if (result != FILE_ERR_OK) {
                prom_printf("%s:%d,", params.rd.dev, params.rd.part);
                prom_perror(result, params.rd.file);
             }
             else {
#define INITRD_CHUNKSIZE 0x400000
                initrd_base = prom_claim(loadinfo.base+loadinfo.memsize, INITRD_CHUNKSIZE, 0);
                if (initrd_base == (void *)-1) {
                   prom_printf("Claim failed for initrd memory\n");
                   initrd_base = 0;
                } else {
                   initrd_size = file.fs->read(&file, INITRD_CHUNKSIZE, initrd_base);
                   if (initrd_size == 0)
                        initrd_base = 0;
                   initrd_read = initrd_size;
                   initrd_more = initrd_base;
                   while (initrd_read == INITRD_CHUNKSIZE ) { /* need to read more? */
                        initrd_want = (void *)((unsigned long)initrd_more+INITRD_CHUNKSIZE);
                        initrd_more = prom_claim(initrd_want, INITRD_CHUNKSIZE, 0);
                        if (initrd_more != initrd_want) {
                           prom_printf("Claim failed for initrd memory at %p rc=%p\n",initrd_want,initrd_more);
                           break;
                        }
                        initrd_read = file.fs->read(&file, INITRD_CHUNKSIZE, initrd_more);
                        DEBUG_F("  block at %p rc=%lu\n",initrd_more,initrd_read);
                        initrd_size += initrd_read;
                   }
                }
                file.fs->close(&file);
                memset(&file, 0, sizeof(file));
             }
             if (initrd_base)
                prom_printf("ramdisk loaded at %p, size: %lu Kbytes\n",
                        initrd_base, initrd_size >> 10);
             else {
                prom_printf("ramdisk load failed !\n");
                prom_pause();
             }
        }

        DEBUG_F("setting kernel args to: %s\n", params.args);
        prom_setargs(params.args);
        DEBUG_F("flushing icache...");
        flush_icache_range ((long)loadinfo.base, (long)loadinfo.base+loadinfo.memsize);
        DEBUG_F(" done\n");

        if (flat_vmlinux) {
             /* 
              * Fill new boot infos (only if booting a vmlinux).
              *
              * The birec is low on memory, probably inside the malloc pool,
              * so we don't write it earlier. At this point, we should not
              * use anything coming from the malloc pool.
              */
             birec = (struct bi_record *)_ALIGN(loadinfo.filesize+(1<<20)-1,(1<<20));

             /* We make sure it's mapped. We map only 64k for now, it's
              * plenty enough we don't claim since this precise memory
              * range may already be claimed by the malloc pool.
              */
             prom_map (birec, birec, 0x10000);
             DEBUG_F("birec at %p\n", birec);
             DEBUG_SLEEP;

             birec->tag = BI_FIRST;
             birec->size = sizeof(struct bi_record);
             birec = (struct bi_record *)((ulong)birec + birec->size);
      
             birec->tag = BI_BOOTLOADER_ID;
             sprintf( (char *)birec->data, "yaboot");
             birec->size = sizeof(struct bi_record) + strlen("yaboot") + 1;
             birec = (struct bi_record *)((ulong)birec + birec->size);
      
             birec->tag = BI_MACHTYPE;
             birec->data[0] = _machine;
             birec->size = sizeof(struct bi_record) + sizeof(ulong);
             birec = (struct bi_record *)((ulong)birec + birec->size);

             if (sysmap_base) {
                  birec->tag = BI_SYSMAP;
                  birec->data[0] = (ulong)sysmap_base;
                  birec->data[1] = sysmap_size;
                  birec->size = sizeof(struct bi_record) + sizeof(ulong)*2;
                  birec = (struct bi_record *)((ulong)birec + birec->size);
             }
             birec->tag = BI_LAST;
             birec->size = sizeof(struct bi_record);
             birec = (struct bi_record *)((ulong)birec + birec->size);
          }

          /* compute the kernel's entry point. */
        kernel_entry = loadinfo.base + loadinfo.entry - loadinfo.load_loc;

        DEBUG_F("Kernel entry point = %p\n", kernel_entry);
        DEBUG_F("kernel: arg1 = %p,\n"
              "        arg2 = 0x%08lx,\n"
              "        prom = %p,\n"
              "        arg4 = %d,\n"
              "        arg5 = %d\n\n",
              initrd_base + loadinfo.load_loc, initrd_size, prom, 0, 0);

        DEBUG_F("Entering kernel...\n");

          /* call the kernel with our stack. */
        kernel_entry(initrd_base + loadinfo.load_loc, initrd_size, prom, 0, 0);
        continue;
     next:
        ; /* do nothing */
     }
}

static int
load_elf32(struct boot_file_t *file, loadinfo_t *loadinfo)
{
     int                i;
     Elf32_Ehdr         *e = &(loadinfo->elf.elf32hdr);
     Elf32_Phdr         *p, *ph;
     int                size = sizeof(Elf32_Ehdr) - sizeof(Elf_Ident);
     unsigned long      addr, loadaddr;

     /* Read the rest of the Elf header... */
     if ((*(file->fs->read))(file, size, &e->e_version) < size) {
        prom_printf("\nCan't read Elf32 image header\n");
        return 0;
     }

     DEBUG_F("Elf32 header:\n");
     DEBUG_F(" e.e_type      = %d\n", (int)e->e_type);
     DEBUG_F(" e.e_machine   = %d\n", (int)e->e_machine);
     DEBUG_F(" e.e_version   = %d\n", (int)e->e_version);
     DEBUG_F(" e.e_entry     = 0x%08x\n", (int)e->e_entry);
     DEBUG_F(" e.e_phoff     = 0x%08x\n", (int)e->e_phoff);
     DEBUG_F(" e.e_shoff     = 0x%08x\n", (int)e->e_shoff);
     DEBUG_F(" e.e_flags     = %d\n", (int)e->e_flags);
     DEBUG_F(" e.e_ehsize    = 0x%08x\n", (int)e->e_ehsize);
     DEBUG_F(" e.e_phentsize = 0x%08x\n", (int)e->e_phentsize);
     DEBUG_F(" e.e_phnum     = %d\n", (int)e->e_phnum);

     loadinfo->entry = e->e_entry;

     if (e->e_phnum > MAX_HEADERS) {
        prom_printf ("Can only load kernels with one program header\n");
        return 0;
     }

     ph = (Elf32_Phdr *)malloc(sizeof(Elf32_Phdr) * e->e_phnum);
     if (!ph) {
        prom_printf ("Malloc error\n");
        return 0;
     }

     /* Now, we read the section header */
     if ((*(file->fs->seek))(file, e->e_phoff) != FILE_ERR_OK) {
        prom_printf ("seek error\n");
        return 0;
     }
     if ((*(file->fs->read))(file, sizeof(Elf32_Phdr) * e->e_phnum, ph) !=
       sizeof(Elf32_Phdr) * e->e_phnum) {
        prom_printf ("read error\n");
        return 0;
     }

     /* Scan through the program header
      * HACK:  We must return the _memory size of the kernel image, not the
      *        file size (because we have to leave room before other boot
      *       infos. This code works as a side effect of the fact that
      *       we have one section and vaddr == p_paddr
      */
     loadinfo->memsize = loadinfo->filesize = loadinfo->offset = 0;
     p = ph;
     for (i = 0; i < e->e_phnum; ++i, ++p) {
        if (p->p_type != PT_LOAD || p->p_offset == 0)
             continue;
        if (loadinfo->memsize == 0) {
             loadinfo->offset = p->p_offset;
             loadinfo->memsize = p->p_memsz;
             loadinfo->filesize = p->p_filesz;
             loadinfo->load_loc = p->p_vaddr;
        } else {
             loadinfo->memsize = p->p_offset + p->p_memsz - loadinfo->offset; /* XXX Bogus */
             loadinfo->filesize = p->p_offset + p->p_filesz - loadinfo->offset;
        }
     }

     if (loadinfo->memsize == 0) {
        prom_printf("Can't find a loadable segment !\n");
        return 0;
     }

     /* leave some room (1Mb) for boot infos */
     loadinfo->memsize = _ALIGN(loadinfo->memsize,(1<<20)) + 0x100000;
     /* Claim OF memory */
     DEBUG_F("Before prom_claim, mem_sz: 0x%08lx\n", loadinfo->memsize);

     /* Determine whether we are trying to boot a vmlinux or some
      * other binary image (eg, zImage).  We load vmlinux's at
      * KERNELADDR and all other binaries at their e_entry value.
      */
     if (e->e_entry == KERNEL_LINK_ADDR_PPC32) {
          flat_vmlinux = 1;
          loadaddr = KERNELADDR;
     } else {
          flat_vmlinux = 0;
          loadaddr = e->e_entry;
     }

     /* On some systems, loadaddr may already be claimed, so try some
      * other nearby addresses before giving up.
      */
     for(addr=loadaddr; addr <= loadaddr * 8 ;addr+=0x100000) {
        loadinfo->base = prom_claim((void *)addr, loadinfo->memsize, 0);
        if (loadinfo->base != (void *)-1) break;
     }
     if (loadinfo->base == (void *)-1) {
        prom_printf("Claim error, can't allocate kernel memory\n");
        return 0;
     }      

     DEBUG_F("After ELF parsing, load base: %p, mem_sz: 0x%08lx\n",
           loadinfo->base, loadinfo->memsize);
     DEBUG_F("    wanted load base: 0x%08lx, mem_sz: 0x%08lx\n",
           loadaddr, loadinfo->memsize);

     /* Load the program segments... */
     p = ph;
     for (i = 0; i < e->e_phnum; ++i, ++p) {
        unsigned long offset;
        if (p->p_type != PT_LOAD || p->p_offset == 0)
             continue;

        /* Now, we skip to the image itself */
        if ((*(file->fs->seek))(file, p->p_offset) != FILE_ERR_OK) {
             prom_printf ("Seek error\n");
             prom_release(loadinfo->base, loadinfo->memsize);
             return 0;
        }
        offset = p->p_vaddr - loadinfo->load_loc;
        if ((*(file->fs->read))(file, p->p_filesz, loadinfo->base+offset) != p->p_filesz) {
             prom_printf ("Read failed\n");
             prom_release(loadinfo->base, loadinfo->memsize);
             return 0;
        }
     }

     free(ph);
    
     /* Return success at loading the Elf32 kernel */
     return 1;
}

static int
load_elf64(struct boot_file_t *file, loadinfo_t *loadinfo)
{
     int                i;
     Elf64_Ehdr         *e = &(loadinfo->elf.elf64hdr);
     Elf64_Phdr         *p, *ph;
     int                size = sizeof(Elf64_Ehdr) - sizeof(Elf_Ident);
     unsigned long      addr, loadaddr;

     /* Read the rest of the Elf header... */
     if ((*(file->fs->read))(file, size, &e->e_version) < size) {
        prom_printf("\nCan't read Elf64 image header\n");
        return 0;
     }

     DEBUG_F("Elf64 header:\n");
     DEBUG_F(" e.e_type      = %d\n", (int)e->e_type);
     DEBUG_F(" e.e_machine   = %d\n", (int)e->e_machine);
     DEBUG_F(" e.e_version   = %d\n", (int)e->e_version);
     DEBUG_F(" e.e_entry     = 0x%016lx\n", (long)e->e_entry);
     DEBUG_F(" e.e_phoff     = 0x%016lx\n", (long)e->e_phoff);
     DEBUG_F(" e.e_shoff     = 0x%016lx\n", (long)e->e_shoff);
     DEBUG_F(" e.e_flags     = %d\n", (int)e->e_flags);
     DEBUG_F(" e.e_ehsize    = 0x%08x\n", (int)e->e_ehsize);
     DEBUG_F(" e.e_phentsize = 0x%08x\n", (int)e->e_phentsize);
     DEBUG_F(" e.e_phnum     = %d\n", (int)e->e_phnum);

     loadinfo->entry = e->e_entry;

     if (e->e_phnum > MAX_HEADERS) {
        prom_printf ("Can only load kernels with one program header\n");
        return 0;
     }

     ph = (Elf64_Phdr *)malloc(sizeof(Elf64_Phdr) * e->e_phnum);
     if (!ph) {
        prom_printf ("Malloc error\n");
        return 0;
     }

     /* Now, we read the section header */
     if ((*(file->fs->seek))(file, e->e_phoff) != FILE_ERR_OK) {
        prom_printf ("Seek error\n");
        return 0;
     }
     if ((*(file->fs->read))(file, sizeof(Elf64_Phdr) * e->e_phnum, ph) !=
       sizeof(Elf64_Phdr) * e->e_phnum) {
        prom_printf ("Read error\n");
        return 0;
     }

     /* Scan through the program header
      * HACK:  We must return the _memory size of the kernel image, not the
      *        file size (because we have to leave room before other boot
      *       infos. This code works as a side effect of the fact that
      *       we have one section and vaddr == p_paddr
      */
     loadinfo->memsize = loadinfo->filesize = loadinfo->offset = 0;
     p = ph;
     for (i = 0; i < e->e_phnum; ++i, ++p) {
        if (p->p_type != PT_LOAD || p->p_offset == 0)
             continue;
        if (loadinfo->memsize == 0) {
             loadinfo->offset = p->p_offset;
             loadinfo->memsize = p->p_memsz;
             loadinfo->filesize = p->p_filesz;
             loadinfo->load_loc = p->p_vaddr;
        } else {
             loadinfo->memsize = p->p_offset + p->p_memsz - loadinfo->offset; /* XXX Bogus */
             loadinfo->filesize = p->p_offset + p->p_filesz - loadinfo->offset;
        }
     }

     if (loadinfo->memsize == 0) {
        prom_printf("Can't find a loadable segment !\n");
        return 0;
     }

     /* leave some room (1Mb) for boot infos */
     loadinfo->memsize = _ALIGN(loadinfo->memsize,(1<<20)) + 0x100000;
     /* Claim OF memory */
     DEBUG_F("Before prom_claim, mem_sz: 0x%08lx\n", loadinfo->memsize);

     /* Determine whether we are trying to boot a vmlinux or some
      * other binary image (eg, zImage).  We load vmlinux's at
      * KERNELADDR and all other binaries at their e_entry value.
      */
     if (e->e_entry == KERNEL_LINK_ADDR_PPC64) {
          flat_vmlinux = 1;
          loadaddr = KERNELADDR;
     } else {
          flat_vmlinux = 0;
          loadaddr = e->e_entry;
     }

     /* On some systems, loadaddr may already be claimed, so try some
      * other nearby addresses before giving up.
      */
     for(addr=loadaddr; addr <= loadaddr * 8 ;addr+=0x100000) {
        loadinfo->base = prom_claim((void *)addr, loadinfo->memsize, 0);
        if (loadinfo->base != (void *)-1) break;
     }
     if (loadinfo->base == (void *)-1) {
        prom_printf("Claim error, can't allocate kernel memory\n");
        return 0;
     }      

     DEBUG_F("After ELF parsing, load base: %p, mem_sz: 0x%08lx\n",
           loadinfo->base, loadinfo->memsize);
     DEBUG_F("    wanted load base: 0x%08lx, mem_sz: 0x%08lx\n",
           loadaddr, loadinfo->memsize);

     /* Load the program segments... */
     p = ph;
     for (i = 0; i < e->e_phnum; ++i, ++p) {
        unsigned long offset;
        if (p->p_type != PT_LOAD || p->p_offset == 0)
             continue;

        /* Now, we skip to the image itself */
        if ((*(file->fs->seek))(file, p->p_offset) != FILE_ERR_OK) {
             prom_printf ("Seek error\n");
             prom_release(loadinfo->base, loadinfo->memsize);
             return 0;
        }
        offset = p->p_vaddr - loadinfo->load_loc;
        if ((*(file->fs->read))(file, p->p_filesz, loadinfo->base+offset) != p->p_filesz) {
             prom_printf ("Read failed\n");
             prom_release(loadinfo->base, loadinfo->memsize);
             return 0;
        }
     }

     free(ph);
    
     /* Return success at loading the Elf64 kernel */
     return 1;
}

static int
is_elf32(loadinfo_t *loadinfo)
{
     Elf32_Ehdr *e = &(loadinfo->elf.elf32hdr);

     return (e->e_ident[EI_MAG0]  == ELFMAG0        &&
           e->e_ident[EI_MAG1]  == ELFMAG1          &&
           e->e_ident[EI_MAG2]  == ELFMAG2          &&
           e->e_ident[EI_MAG3]  == ELFMAG3          &&
           e->e_ident[EI_CLASS] == ELFCLASS32  &&
           e->e_ident[EI_DATA]  == ELFDATA2MSB &&
           e->e_type            == ET_EXEC          &&
           e->e_machine         == EM_PPC);
}

static int
is_elf64(loadinfo_t *loadinfo)
{
     Elf64_Ehdr *e = &(loadinfo->elf.elf64hdr);

     return (e->e_ident[EI_MAG0]  == ELFMAG0        &&
           e->e_ident[EI_MAG1]  == ELFMAG1          &&
           e->e_ident[EI_MAG2]  == ELFMAG2          &&
           e->e_ident[EI_MAG3]  == ELFMAG3          &&
           e->e_ident[EI_CLASS] == ELFCLASS64  &&
           e->e_ident[EI_DATA]  == ELFDATA2MSB &&
           e->e_type            == ET_EXEC          &&
           e->e_machine         == EM_PPC64);
}

static void
setup_display(void)
{
#ifdef CONFIG_SET_COLORMAP
     static unsigned char default_colors[] = {
        0x00, 0x00, 0x00,
        0x00, 0x00, 0xaa,
        0x00, 0xaa, 0x00,
        0x00, 0xaa, 0xaa,
        0xaa, 0x00, 0x00,
        0xaa, 0x00, 0xaa,
        0xaa, 0x55, 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
     };
     int i, result;
     prom_handle scrn = PROM_INVALID_HANDLE;

     /* Try Apple's mac-boot screen ihandle */
     result = (int)call_prom_return("interpret", 1, 2,
                            "\" _screen-ihandle\" $find if execute else 0 then", &scrn);
     DEBUG_F("Trying to get screen ihandle, result: %d, scrn: %p\n", result, scrn);

     if (scrn == 0 || scrn == PROM_INVALID_HANDLE) {
        char type[32];
        /* Hrm... check to see if stdout is a display */
        scrn = call_prom ("instance-to-package", 1, 1, prom_stdout);
        DEBUG_F("instance-to-package of stdout is: %p\n", scrn);
        if (prom_getprop(scrn, "device_type", type, 32) > 0 && !strncmp(type, "display", 7)) {
             DEBUG_F("got it ! stdout is a screen\n");
             scrn = prom_stdout;
        } else {
             /* Else, we try to open the package */
             scrn = (prom_handle)call_prom( "open", 1, 1, "screen" );
             DEBUG_F("Open screen result: %p\n", scrn);
        }
     }
      
     if (scrn == PROM_INVALID_HANDLE) {
        prom_printf("No screen device found !/n");
        return;
     }
     for(i=0;i<16;i++) {
        prom_set_color(scrn, i, default_colors[i*3],
                   default_colors[i*3+1], default_colors[i*3+2]);
     }
     prom_printf("\x1b[1;37m\x1b[2;40m"); 
#ifdef COLOR_TEST
     for (i=0;i<16; i++) {
        prom_printf("\x1b[%d;%dm\x1b[1;47m%s \x1b[2;40m %s\n",
                  ansi_color_table[i].index,
                  ansi_color_table[i].value,
                  ansi_color_table[i].name,
                  ansi_color_table[i].name);
        prom_printf("\x1b[%d;%dm\x1b[1;37m%s \x1b[2;30m %s\n",
                  ansi_color_table[i].index,
                  ansi_color_table[i].value+10,
                  ansi_color_table[i].name,
                  ansi_color_table[i].name);
     }
     prom_printf("\x1b[1;37m\x1b[2;40m"); 
#endif /* COLOR_TEST */

#if !DEBUG
     prom_printf("\xc");
#endif /* !DEBUG */

#endif /* CONFIG_SET_COLORMAP */
}

int
yaboot_main(void)
{
     char *ptype;

     if (_machine == _MACH_Pmac)
        setup_display();
      
     prom_get_chosen("bootpath", bootdevice, sizeof(bootdevice));
     DEBUG_F("/chosen/bootpath = %s\n", bootdevice);
     if (bootdevice[0] == 0) {
        prom_get_options("boot-device", bootdevice, sizeof(bootdevice));
        DEBUG_F("boot-device = %s\n", bootdevice);
     }
     if (bootdevice[0] == 0) {
        prom_printf("Couldn't determine boot device\n");
        return -1;
     }

     if (!parse_device_path(bootdevice, NULL, -1, "", &boot)) {
        prom_printf("%s: Unable to parse\n", bootdevice);
        return -1;
     }
     DEBUG_F("After parse_device_path: dev=%s, part=%d, file=%s\n",
           boot.dev, boot.part, boot.file);

     if (strlen(boot.file)) {
        if (!strncmp(boot.file, "\\\\", 2))
             boot.file = "\\\\";
        else {
             char *p, *last;
             p = last = boot.file;
             while(*p) {
                if (*p == '\\')
                   last = p;
                p++;
             }
             if (p)
                *(last) = 0;
             else
                boot.file = "";
             if (strlen(boot.file))
                strcat(boot.file, "\\");
        }
     }
     DEBUG_F("After pmac path kludgeup: dev=%s, part=%d, file=%s\n",
           boot.dev, boot.part, boot.file);

     useconf = load_config_file(boot.dev, boot.file, boot.part);

     prom_printf("Welcome to yaboot version " VERSION "\n");
     prom_printf("Enter \"help\" to get some basic usage information\n");

     /* I am fed up with lusers using the wrong partition type and
      mailing me *when* it breaks */

     if (_machine == _MACH_Pmac) {
        char *entry = cfg_get_strg(0, "ptypewarning");
        int warn = 1;
        if (entry)
             warn = strcmp(entry,
                       "I_know_the_partition_type_is_wrong_and_will_NOT_send_mail_when_booting_breaks");
        if (warn) {
             ptype = get_part_type(boot.dev, boot.part);
             if ((ptype != NULL) && (strcmp(ptype, "Apple_Bootstrap")))
                prom_printf("\nWARNING: Bootstrap partition type is wrong: \"%s\"\n"
                        "         type should be: \"Apple_Bootstrap\"\n\n", ptype);
        }
     }

     yaboot_text_ui();
      
     prom_printf("Bye.\n");
     return 0;
}

/* 
 * Local variables:
 * c-file-style: "k&r"
 * c-basic-offset: 5
 * End:
 */

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