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Get defaults for the boot device (and flags) from the file

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"boot.config" (relative to the root directory on the 'a' partition
on the first BSD slice) if it exists.  If it doesn't exist, then
the only visible changes should be that the kernel name isn't reset
to "/kernel" after looking it up fails and that the default name
is now "kernel".

The new function readfile() can be used for other things:
- reading help messages.
- reading splash screens.
- reading userconfig info.
This commit is contained in:
Bruce Evans 1997-02-13 13:15:47 +00:00
parent 30c218bf14
commit 8363c19687
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=22646
1 changed files with 48 additions and 16 deletions
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64
sys/i386/boot/biosboot/boot.c
View file

@ -62,8 +62,10 @@ WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#define ouraddr (BOOTSEG << 4) /* XXX */
#define BOOT_CONFIG_SIZE 512
#define NAMEBUF_LEN (8*1024)
static char boot_config[BOOT_CONFIG_SIZE];
#ifdef NAMEBLOCK
char *dflt_name;
#endif
@ -74,6 +76,7 @@ int loadflags;
static void getbootdev(char *ptr, int *howto);
static void loadprog(void);
static void readfile(char *path, char *buf, size_t nbytes);
/* NORETURN */
void
@ -151,8 +154,16 @@ boot(int drive)
name = dflt_name;
} else
#endif /*NAMEBLOCK*/
name = "kernel";
readfile("boot.config", boot_config, BOOT_CONFIG_SIZE);
getbootdev(boot_config, &loadflags);
if (namebuf[0] != '\0')
printf("boot.config: %s", boot_config);
/*
* XXX parsing of `name' is in openrd(), so the defaults aren't
* updated to match the config (if any) before printing the prompt.
*/
loadstart:
name = "/kernel";
/* print this all each time.. (saves space to do so) */
/* If we have looped, use the previous entries as defaults */
printf("\n>> FreeBSD BOOT @ 0x%x: %d/%d k of memory\n"
@ -163,7 +174,17 @@ boot(int drive)
dosdev & 0x7f, devs[maj], unit, name);
loadflags &= RB_SERIAL; /* clear all, but leave serial console */
getbootdev(namebuf, &loadflags);
/*
* Be paranoid and make doubly sure that the input buffer is empty.
*/
if (loadflags & RB_SERIAL)
init_serial();
if (!gets(namebuf))
putchar('\n');
else
getbootdev(namebuf, &loadflags);
ret = openrd();
if (ret != 0) {
if (ret > 0)
@ -306,28 +327,39 @@ loadprog(void)
(int)&bootinfo + ouraddr);
}
void
static void
readfile(char *path, char *buf, size_t nbytes)
{
int openstatus;
buf[0] = '\0';
name = path;
openstatus = openrd();
if (openstatus != 0) {
if (openstatus > 0)
printf("Can't find file %s\n", name);
} else {
/* XXX no way to determine file size. */
read(buf, nbytes);
}
buf[nbytes - 1] = '\0';
#if 0
pcpy(buf, (void *)0x800, nbytes);
#endif
}
static void
getbootdev(char *ptr, int *howto)
{
char c;
/*
* Be paranoid and make doubly sure that the input buffer is empty.
*/
if (*howto & RB_SERIAL)
init_serial();
if (!gets(ptr)) {
putchar('\n');
return;
}
while ((c = *ptr) != '\0') {
nextarg:
while (c == ' ')
while (c == ' ' || c == '\n')
c = *++ptr;
if (c == '-')
while ((c = *++ptr) != '\0') {
if (c == ' ')
if (c == ' ' || c == '\n')
goto nextarg;
if (c == 'C')
*howto |= RB_CDROM;
@ -358,7 +390,7 @@ getbootdev(char *ptr, int *howto)
return;
name = ptr;
while (*++ptr != '\0') {
if (*ptr == ' ') {
if (*ptr == ' ' || *ptr == '\n') {
*ptr++ = '\0';
break;
}