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Set $currdev according to our best guess at the BIOS device that the previous
bootstrap loaded us from.
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parent
6b15efd961
commit
41e43bf627
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=39897
@ -23,7 +23,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: main.c,v 1.7 1998/09/26 01:31:10 msmith Exp $
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* $Id: main.c,v 1.8 1998/09/28 20:17:05 peter Exp $
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*/
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/*
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@ -55,6 +55,8 @@ struct bootinfo *initial_bootinfo;
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struct arch_switch archsw; /* MI/MD interface boundary */
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static void extract_currdev(void);
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/* from vers.c */
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extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
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@ -64,7 +66,6 @@ extern char end[];
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void
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main(void)
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{
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struct i386_devdesc currdev;
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int i;
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/* Pick up arguments */
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@ -106,18 +107,8 @@ main(void)
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printf("using %d bytes of stack at %p\n", (&stacktop - &stackbase), &stacktop);
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#endif
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/* We're booting from a BIOS disk, try to spiff this */
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currdev.d_dev = devsw[0]; /* XXX presumes that biosdisk is first in devsw */
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currdev.d_type = currdev.d_dev->dv_type;
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currdev.d_kind.biosdisk.unit = 0; /* XXX wrong, need to get from bootinfo etc. */
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currdev.d_kind.biosdisk.slice = -1; /* XXX should be able to detect this, default to autoprobe */
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currdev.d_kind.biosdisk.partition = 0; /* default to 'a' */
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/* Create i386-specific variables */
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env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&currdev), i386_setcurrdev, env_nounset);
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env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&currdev), env_noset, env_nounset);
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setenv("LINES", "24", 1); /* optional */
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extract_currdev(); /* set $currdev and $loaddev */
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setenv("LINES", "24", 1); /* optional */
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archsw.arch_autoload = i386_autoload;
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archsw.arch_getdev = i386_getdev;
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@ -133,6 +124,43 @@ main(void)
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interact(); /* doesn't return */
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}
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/*
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* Set the 'current device' by (if possible) recovering the boot device as
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* supplied by the initial bootstrap.
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*
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* XXX should be extended for netbooting.
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*/
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static void
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extract_currdev(void)
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{
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struct i386_devdesc currdev;
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int major, biosdev, i;
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/* We're booting from a BIOS disk, try to spiff this */
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currdev.d_dev = devsw[0]; /* XXX presumes that biosdisk is first in devsw */
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currdev.d_type = currdev.d_dev->dv_type;
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currdev.d_kind.biosdisk.slice = (B_ADAPTOR(kargs->bootdev) << 4) + B_CONTROLLER(kargs->bootdev) - 1;
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currdev.d_kind.biosdisk.partition = B_PARTITION(kargs->bootdev);
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biosdev = initial_bootinfo->bi_bios_dev;
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major = B_TYPE(kargs->bootdev);
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/*
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* If we are booted by an old bootstrap, we have to guess at the BIOS
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* unit number. We will loose if there is more than one disk type
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* and we are not booting from the lowest-numbered disk type.
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*/
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if ((biosdev == 0) && (major != 2)) /* biosdev doesn't match major */
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biosdev = 0x80 + B_UNIT(kargs->bootdev); /* assume harddisk */
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if ((currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1) {
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printf("Can't work out which disk we are booting from, defaulting to disk0:\n");
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currdev.d_kind.biosdisk.unit;
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}
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env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&currdev), i386_setcurrdev, env_nounset);
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env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&currdev), env_noset, env_nounset);
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}
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COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
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static int
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@ -151,26 +179,6 @@ exit(int code)
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__exit(code);
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}
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#if 0 /* XXX learn to ask BTX */
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COMMAND_SET(stack, "stack", "show stack usage", command_stack);
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extern char stackbase, stacktop;
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static int
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command_stack(int argc, char *argv[])
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{
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char *cp;
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for (cp = &stackbase; cp < &stacktop; cp++)
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if (*cp != 0)
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break;
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printf("%d bytes of stack used\n", &stacktop - cp);
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return(CMD_OK);
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}
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#endif
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COMMAND_SET(heap, "heap", "show heap usage", command_heap);
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static int
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