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706f0629f8
Bochs/bochs/patches/patch.cliff-bios-display
Bryce Denney c37e0c9ba2 - hacked this patch a bit. I've been mostly testing the new code by 
booting nonbootable and nonreadable floppy disks.
2001-11-18 16:56:52 +00:00

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Index: bios/rombios.c
===================================================================
RCS file: /cvsroot/bochs/bochs/bios/rombios.c,v
retrieving revision 1.22
diff -u -r1.22 rombios.c
--- bios/rombios.c 2001/11/18 16:40:26 1.22
+++ bios/rombios.c 2001/11/18 16:55:40
@@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
-// $Id: rombios.c,v 1.22 2001/11/18 16:40:26 bdenney Exp $
+// $Id: rombios.c,v 1.21 2001/11/14 01:39:22 bdenney Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
@@ -273,16 +273,28 @@
static void boot_failure_msg();
static void nmi_handler_msg();
static void print_bios_banner();
-static char bios_version_string[] = "BIOS Version is $Id: rombios.c,v 1.22 2001/11/18 16:40:26 bdenney Exp $";
+static char bios_cvs_version_string[] = "$Revision: 1.14 $";
+static char bios_date_string[] = "$Date: 2001/06/13 07:06:10 $";
+
+static char CVSID[] = "$Id: rombios.c,v 1.14 2001/06/13 07:06:10 bdenney Exp $";
+/* Offset to skip the CVS $Id: prefix */
+#define bios_version_string (CVSID + 4)
+
+#define BIOS_PRINTF_HALT 1
+#define BIOS_PRINTF_SCREEN 2
+#define BIOS_PRINTF_DEBUG 4
+#define BIOS_PRINTF_ALL (BIOS_PRINTF_SCREEN | BIOS_PRINTF_DEBUG)
+#define BIOS_PRINTF_DEBHALT (BIOS_PRINTF_SCREEN | BIOS_PRINTF_DEBUG | BIOS_PRINTF_HALT)
+
#define DEBUG_ROMBIOS 0
#if DEBUG_ROMBIOS
-# define printf(format, p...) bios_printf(0, format, ##p)
-# define panic(format, p...) bios_printf(1, format, ##p)
+# define printf(format, p...) bios_printf(BIOS_PRINTF_DEBUG, format, ##p)
+# define panic(format, p...) bios_printf(BIOS_PRINTF_DEBHALT, format, ##p)
#else
# define printf(format, p...)
-# define panic(format, p...) bios_printf(1, format, ##p)
+# define panic(format, p...) bios_printf(BIOS_PRINTF_DEBHALT, format, ##p)
#endif
@@ -607,6 +619,7 @@
write_byte(seg, offset, data)
Bit16u seg;
Bit16u offset;
+ Bit8u data;
{
#asm
push bp
@@ -755,19 +768,51 @@
#endasm
}
+ void
+wrch(c)
+ Bit8u c;
+{
+ #asm
+ push bp
+ mov bp, sp
+
+ push bx
+ mov ah, #$0e
+ mov al, 4[bp]
+ xor bx,bx
+ int #$10
+ pop bx
+
+ pop bp
+ #endasm
+}
+
+ void
+send(action, c)
+ Bit16u action;
+ Bit8u c;
+{
+ if (action & BIOS_PRINTF_DEBUG) outb(0xfff0, c);
+ if (action & BIOS_PRINTF_SCREEN) {
+ if (c == '\n') wrch('\r');
+ wrch(c);
+ }
+}
+
void
-put_int(val, width, neg)
+put_int(action, val, width, neg)
+ Bit16u action;
short val, width;
Boolean neg;
{
short nval = UDIV16(val, 10);
if (nval)
- put_int(nval, width - 1, neg);
+ put_int(action, nval, width - 1, neg);
else {
- while (--width > 0) outb(0xfff0, ' ');
- if (neg) outb(0xfff0, '-');
+ while (--width > 0) send(action, ' ');
+ if (neg) send(action, '-');
}
- outb(0xfff0, val - (nval * 10) + '0');
+ send(action, val - (nval * 10) + '0');
}
//--------------------------------------------------------------------------
@@ -775,10 +820,13 @@
// A compact variable argument printf function which prints its output via
// an I/O port so that it can be logged by Bochs. Currently, only %x is
// supported (or %02x, %04x, etc).
+//
+// Supports %[format_width][format]
+// where format can be d,x,c,s
//--------------------------------------------------------------------------
void
-bios_printf(bomb, s)
- Boolean bomb;
+bios_printf(action, s)
+ Bit16u action;
Bit8u *s;
{
Bit8u c, format_char;
@@ -793,6 +841,10 @@
in_format = 0;
format_width = 0;
+ if ((action & BIOS_PRINTF_DEBHALT) == BIOS_PRINTF_DEBHALT) {
+ bios_printf (BIOS_PRINTF_ALL, "FATAL: ");
+ }
+
while (c = read_byte(0xf000, s)) {
if ( c == '%' ) {
in_format = 1;
@@ -802,39 +854,48 @@
if ( (c>='0') && (c<='9') ) {
format_width = (format_width * 10) + (c - '0');
}
- else if (c == 'x') {
+ else {
arg_ptr++; // increment to next arg
arg = read_word(arg_seg, arg_ptr);
- if (format_width == 0)
- format_width = 4;
- for (i=format_width-1; i>=0; i--) {
- nibble = (arg >> (4 * i)) & 0x000f;
- if (nibble <= 9)
- outb(0xfff0, nibble + '0');
+ if (c == 'x') {
+ if (format_width == 0)
+ format_width = 4;
+ for (i=format_width-1; i>=0; i--) {
+ nibble = (arg >> (4 * i)) & 0x000f;
+ send (action, (nibble<=9)? (nibble+'0') : (nibble-10+'A'));
+ }
+ }
+ else if (c == 'd') {
+ if (arg & 0x8000)
+ put_int(action, -arg, format_width - 1, 1);
else
- outb(0xfff0, (nibble - 10) + 'A');
+ put_int(action, arg, format_width, 0);
}
- in_format = 0;
- }
- else if (c == 'd') {
- arg_ptr++; // increment to next arg
- arg = read_word(arg_seg, arg_ptr);
- if (arg & 0x8000)
- put_int(-arg, format_width - 1, 1);
+ else if (c == 's') {
+ bios_printf(action & (~BIOS_PRINTF_HALT), arg);
+ }
+ else if (c == 'c') {
+ send(action, arg);
+ }
else
- put_int(arg, format_width, 0);
- in_format = 0;
+ panic("bios_printf: unknown format");
+ in_format = 0;
}
- else
- panic("bios_printf: unknown format");
}
else {
- outb(0xfff0, c);
+ send(action, c);
}
s ++;
}
- if (bomb) {
+ if (action & BIOS_PRINTF_HALT) {
+ // freeze in a busy loop. If I do a HLT instruction, then in versions
+ // 1.3.pre1 and earlier, it will panic without ever updating the VGA
+ // display, so the panic message will not be visible. By waiting
+ // forever, you are certain to see the panic message on screen.
+ // After a few more versions have passed, we can turn this back into
+ // a halt or something.
+ do {} while (1);
#asm
HALT2(__LINE__)
#endasm
@@ -855,32 +916,51 @@
panic("Keyboard RESET error");
}
+/*
+This is called when the boot fails to print an appropriate message.
+If bit 16 is 0, the disk was not readable.
+If bit 16 is 1, the disk was readable but didn't have the boot signature.
+If bit 15 is 0, it tried to boot a floppy disk.
+If bit 15 is 1, it tried to boot a hard disk.
+Bits 14-0 are the drive number, usually just a 0 or 1.
+*/
void
boot_failure_msg(drive)
Bit16u drive;
{
- if (drive < 0x80) {
- bios_printf(0, "Booting from floppy drive %d.\n", drive);
- } else {
- bios_printf(0, "Booting from hard drive %d.\n", drive & 0x7f);
- }
+ Bit16u drivenum = drive&0x7f;
+ //bios_printf(BIOS_PRINTF_SCREEN, "boot_failure_msg(%x)\n", drive);
+ if (drive & 0x80)
+ bios_printf(BIOS_PRINTF_DEBUG | BIOS_PRINTF_SCREEN, "Boot from hard disk %d failed\n", drivenum);
+ else
+ bios_printf(BIOS_PRINTF_DEBUG | BIOS_PRINTF_SCREEN, "Boot from floppy disk %d failed\n", drivenum);
if (drive & 0x100)
- panic("Not a bootable disk");
+ panic("Not a bootable disk\n");
else
- panic("Could not read the boot disk");
+ panic("Could not read the boot disk\n");
}
void
nmi_handler_msg()
+{
+ bios_printf(BIOS_PRINTF_DEBUG, "NMI Handler called\n");
+}
+
+void
+log_bios_start()
{
- bios_printf(0, "NMI Handler called\n");
+ bios_printf(BIOS_PRINTF_DEBUG, "%s\n", bios_version_string);
}
void
print_bios_banner()
{
- bios_printf(0, bios_version_string);
- bios_printf(0, "\n");
+ bios_printf(BIOS_PRINTF_SCREEN, "Bochs BIOS, %s %s\n\n",
+ bios_cvs_version_string, bios_date_string);
+ /*
+ bios_printf(BIOS_PRINTF_SCREEN, "Test: x234=%3x, d-123=%d, c=%c, s=%s\n",
+ 0x1234, -123, '!', "ok");
+ */
}
@@ -1896,6 +1976,9 @@
if ( (num_sectors > 128) || (num_sectors == 0) )
panic("int13_function(): num_sectors out of range!");
+ if (head > 15)
+ panic("hard drive BIOS:(read/verify) head > 15\n");
+
if ( GET_AH() == 0x04 ) {
SET_AH(0);
set_disk_ret_status(0);
@@ -2039,6 +2122,9 @@
if ( (num_sectors > 128) || (num_sectors == 0) )
panic("int13_function(): num_sectors out of range!");
+ if (head > 15)
+ panic("hard drive BIOS:(read) head > 15\n");
+
status = inb(0x1f7);
if (status & 0x80) {
panic("hard drive BIOS:(read) BUSY bit set");
@@ -3617,8 +3703,7 @@
;; if dh=0, load failed. if dh=1, signature check failed.
push dx
call _boot_failure_msg
- int #0x18 ;; Boot failure
- iret
+ hlt
;----------
;- INT18h -
@@ -4174,6 +4259,8 @@
mov ds, ax
mov ss, ax
+ call _log_bios_start
+
;; zero out BIOS data area (40:00..40:ff)
mov es, ax
mov cx, #0x0080 ;; 128 words
@@ -4230,6 +4317,7 @@
;; System Services
SET_INT_VECTOR(0x15, #0xF000, #int15_handler)
+
mov ax, #0x0000 ; mov EBDA seg into 40E
mov ds, ax
mov 0x40E, #EBDA_SEG
@@ -4387,6 +4475,8 @@
out 0x21, AL ;master pic: all IRQs unmasked
out 0xA1, AL ;slave pic: all IRQs unmasked
+ call _print_bios_banner
+
;;
;; Hard Drive setup
;;
@@ -4396,8 +4486,6 @@
;; Floppy setup
;;
call floppy_drive_post
-
- call _print_bios_banner
int #0x19
//JMP_EP(0x0064) ; INT 19h location
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