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      1 /*	$NetBSD: bootinfo.c,v 1.4 2012/12/27 20:21:51 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 Michael Smith <msmith (at) freebsd.org>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 /* __FBSDID("$FreeBSD: src/sys/boot/ia64/libski/bootinfo.c,v 1.9 2003/09/08 09:11:32 obrien Exp $"); */
     31 
     32 #include <lib/libsa/stand.h>
     33 #include <lib/libsa/loadfile.h>
     34 
     35 #include <sys/param.h>
     36 #include <sys/reboot.h>
     37 #include <sys/boot_flag.h>
     38 #include <sys/exec_elf.h>
     39 #include <sys/lock.h>
     40 
     41 #include <machine/vmparam.h>
     42 #include <machine/elf_machdep.h>
     43 #include <machine/bootinfo.h>
     44 
     45 
     46 #include "bootstrap.h"
     47 #include "libski.h"
     48 
     49 /*
     50  * Return a 'boothowto' value corresponding to the kernel arguments in
     51  * (kargs) and any relevant environment variables.
     52  */
     53 static struct
     54 {
     55     const char	*ev;
     56     int		mask;
     57 } howto_names[] = {
     58     {"boot_askname",	RB_ASKNAME},
     59     {"boot_single",	RB_SINGLE},
     60     {"boot_nosync",     RB_NOSYNC},
     61     {"boot_halt",       RB_HALT},
     62     {"boot_kdb",	RB_KDB},
     63     {"boot_rdonly",     RB_RDONLY},
     64     {"boot_dump",       RB_DUMP},
     65     {"boot_miniroot",   RB_MINIROOT},
     66     {"boot_userconf",   RB_USERCONF},
     67     {NULL,	0}
     68 };
     69 
     70 vaddr_t ia64_unwindtab = 0;		/* This is set by the libsa/loadfile_elf32.c MD_LOADSEG callback */
     71 vsize_t ia64_unwindtablen = 0;
     72 
     73 
     74 extern char *ski_fmtdev(void *vdev);
     75 extern int ski_init_stubs(struct bootinfo *);
     76 
     77 int
     78 bi_getboothowto(char *kargs)
     79 {
     80     char	*cp;
     81     int		howto;
     82     int		active;
     83     int		i;
     84 
     85     /* Parse kargs */
     86     howto = 0;
     87     if (kargs  != NULL) {
     88 	cp = kargs;
     89 	active = 0;
     90 	while (*cp != 0) {
     91 	    if (!active && (*cp == '-')) {
     92 		active = 1;
     93 	    } else if (active)
     94 
     95 	      BOOT_FLAG(*cp, howto);
     96 
     97 	    cp++;
     98 	}
     99     }
    100     /* get equivalents from the environment */
    101     for (i = 0; howto_names[i].ev != NULL; i++)
    102 	if (getenv(howto_names[i].ev) != NULL)
    103 	    howto |= howto_names[i].mask;
    104     return(howto);
    105 }
    106 
    107 
    108 /*
    109  * Copy the environment into the load area starting at (addr).
    110  * Each variable is formatted as <name>=<value>, with a single nul
    111  * separating each variable, and a double nul terminating the environment.
    112  */
    113 vaddr_t
    114 bi_copyenv(vaddr_t addr)
    115 {
    116     struct env_var	*ep;
    117 
    118     /* traverse the environment */
    119     for (ep = environ; ep != NULL; ep = ep->ev_next) {
    120 	ski_copyin(ep->ev_name, addr, strlen(ep->ev_name));
    121 	addr += strlen(ep->ev_name);
    122 	ski_copyin("=", addr, 1);
    123 	addr++;
    124 	if (ep->ev_value != NULL) {
    125 	    ski_copyin(ep->ev_value, addr, strlen(ep->ev_value));
    126 	    addr += strlen(ep->ev_value);
    127 	}
    128 	ski_copyin("", addr, 1);
    129 	addr++;
    130     }
    131     ski_copyin("", addr, 1);
    132     addr++;
    133     return(addr);
    134 }
    135 
    136 /*
    137  * Copy module-related data into the load area, where it can be
    138  * used as a directory for loaded modules.
    139  *
    140  * Module data is presented in a self-describing format.  Each datum
    141  * is preceded by a 32-bit identifier and a 32-bit size field.
    142  *
    143  * Currently, the following data are saved:
    144  *
    145  * MOD_NAME	(variable)		module name (string)
    146  * MOD_TYPE	(variable)		module type (string)
    147  * MOD_ARGS	(variable)		module parameters (string)
    148  * MOD_ADDR	sizeof(vm_offset_t)	module load address
    149  * MOD_SIZE	sizeof(size_t)		module size
    150  * MOD_METADATA	(variable)		type-specific metadata
    151  */
    152 #define COPY32(v, a) {				\
    153     u_int32_t	x = (v);			\
    154     ski_copyin(&x, a, sizeof(x));		\
    155     a += sizeof(x);				\
    156 }
    157 
    158 #define MOD_STR(t, a, s) {			\
    159     COPY32(t, a);				\
    160     COPY32(strlen(s) + 1, a);			\
    161     ski_copyin(s, a, strlen(s) + 1);		\
    162     a += roundup(strlen(s) + 1, sizeof(u_int64_t));\
    163 }
    164 
    165 #define MOD_NAME(a, s)	MOD_STR(MODINFO_NAME, a, s)
    166 #define MOD_TYPE(a, s)	MOD_STR(MODINFO_TYPE, a, s)
    167 #define MOD_ARGS(a, s)	MOD_STR(MODINFO_ARGS, a, s)
    168 
    169 #define MOD_VAR(t, a, s) {			\
    170     COPY32(t, a);				\
    171     COPY32(sizeof(s), a);			\
    172     ski_copyin(&s, a, sizeof(s));		\
    173     a += roundup(sizeof(s), sizeof(u_int64_t));	\
    174 }
    175 
    176 #define MOD_ADDR(a, s)	MOD_VAR(MODINFO_ADDR, a, s)
    177 #define MOD_SIZE(a, s)	MOD_VAR(MODINFO_SIZE, a, s)
    178 
    179 #define MOD_METADATA(a, mm) {			\
    180     COPY32(MODINFO_METADATA | mm->md_type, a);	\
    181     COPY32(mm->md_size, a);			\
    182     ski_copyin(mm->md_data, a, mm->md_size);	\
    183     a += roundup(mm->md_size, sizeof(u_int64_t));\
    184 }
    185 
    186 #define MOD_END(a) {				\
    187     COPY32(MODINFO_END, a);			\
    188     COPY32(0, a);				\
    189 }
    190 
    191 /*
    192  * Load the information expected by an ia64 kernel.
    193  *
    194  * - The kernel environment is copied into kernel space.
    195  * - Module metadata are formatted and placed in kernel space.
    196  */
    197 int
    198 bi_load(struct bootinfo *bi, struct preloaded_file *fp, char *args)
    199 {
    200     char			*rootdevname;
    201     struct ski_devdesc		*rootdev;
    202     struct preloaded_file	*xp;
    203     vaddr_t			addr, bootinfo_addr;
    204     char			*kernelname;
    205     vaddr_t			ssym, esym;
    206     struct file_metadata	*md;
    207 
    208     /*
    209      * Version 1 bootinfo.
    210      */
    211     bi->bi_magic = BOOTINFO_MAGIC;
    212     bi->bi_version = 1;
    213 
    214     /*
    215      * Calculate boothowto.
    216      */
    217     bi->bi_boothowto = bi_getboothowto(fp->f_args);
    218 
    219     /*
    220      * Allow the environment variable 'rootdev' to override the supplied device
    221      * This should perhaps go to MI code and/or have $rootdev tested/set by
    222      * MI code before launching the kernel.
    223      */
    224     rootdevname = getenv("rootdev");
    225     ski_getdev((void **)(&rootdev), rootdevname, NULL);
    226     if (rootdev == NULL) {		/* bad $rootdev/$currdev */
    227 	printf("can't determine root device\n");
    228 	return(EINVAL);
    229     }
    230 
    231     /* Try reading the /etc/fstab file to select the root device */
    232     getrootmount(ski_fmtdev((void *)rootdev));
    233     free(rootdev);
    234 
    235     ssym = esym = 0;
    236 
    237     ssym = fp->marks[MARK_SYM];
    238     esym = fp->marks[MARK_END];
    239 
    240     if (ssym == 0 || esym == 0)
    241 	ssym = esym = 0;		/* sanity */
    242 
    243     bi->bi_symtab = ssym;
    244     bi->bi_esymtab = esym;
    245 
    246     /* find the last module in the chain */
    247     addr = 0;
    248     for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
    249 	if (addr < (xp->f_addr + xp->f_size))
    250 	    addr = xp->f_addr + xp->f_size;
    251     }
    252 
    253     /* pad to a page boundary */
    254     addr = (addr + PAGE_MASK) & ~PAGE_MASK;
    255 
    256     /* copy our environment */
    257     bi->bi_envp = addr;
    258     addr = bi_copyenv(addr);
    259 
    260     /* copy the unwind table pointer */
    261     if((bi->bi_unwindtab = (uint64_t) ia64_unwindtab) == 0)
    262 	    printf("Warning: ia64 unwind sections not found. \n"
    263 		   "See: include/loadfile_machdep.h \n");
    264 
    265     if((bi->bi_unwindtablen = (uint64_t) ia64_unwindtablen) == 0)
    266 	    printf("Warning: ia64 unwind section length is zero. \n "
    267 		   "See: include/loadfile_machdep.h \n");
    268 
    269     /* pad to a page boundary */
    270     addr = (addr + PAGE_MASK) & ~PAGE_MASK;
    271 
    272     /* all done copying stuff in, save end of loaded object space */
    273     bi->bi_kernend = addr;
    274 
    275     return (ski_init_stubs(bi));
    276 }
    277