[src/trunk]: src/sbin/fdisk Add and build a bootselecting MBR (i386).

[fvdl <fvdl%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/947b9c908b94
branches:  trunk
changeset: 471942:947b9c908b94
user:      fvdl <fvdl%NetBSD.org@localhost>
date:      Thu Apr 15 22:31:23 1999 +0000

description:
Add and build a bootselecting MBR (i386).

diffstat:

 sbin/fdisk/Makefile                  |    4 +-
 sbin/fdisk/mbr/Makefile              |    5 +-
 sbin/fdisk/mbr_bootsel/Makefile      |   26 +
 sbin/fdisk/mbr_bootsel/mbr_bootsel.S |  516 +++++++++++++++++++++++++++++++++++
 4 files changed, 547 insertions(+), 4 deletions(-)

diffs (truncated from 587 to 300 lines):

diff -r 8189282fbdb8 -r 947b9c908b94 sbin/fdisk/Makefile
--- a/sbin/fdisk/Makefile       Thu Apr 15 22:31:16 1999 +0000
+++ b/sbin/fdisk/Makefile       Thu Apr 15 22:31:23 1999 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: Makefile,v 1.10 1998/10/15 15:23:23 ws Exp $
+#      $NetBSD: Makefile,v 1.11 1999/04/15 22:31:23 fvdl Exp $
 
 
 .if (${MACHINE} == "i386" || ${MACHINE} == "powerpc")
@@ -9,7 +9,7 @@
 .endif
 
 .if ${MACHINE} == "i386"
-SUBDIR=        mbr
+SUBDIR=        mbr mbr_bootsel
 .endif
 
 MAN=   fdisk.8
diff -r 8189282fbdb8 -r 947b9c908b94 sbin/fdisk/mbr/Makefile
--- a/sbin/fdisk/mbr/Makefile   Thu Apr 15 22:31:16 1999 +0000
+++ b/sbin/fdisk/mbr/Makefile   Thu Apr 15 22:31:23 1999 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: Makefile,v 1.3 1999/03/24 16:02:41 christos Exp $
+#      $NetBSD: Makefile,v 1.4 1999/04/15 22:31:23 fvdl Exp $
 
 BINDIR=        /usr/mdec
 BINMODE=444
@@ -7,7 +7,8 @@
 
 PROG=  mbr
 SRCS=  mbr.S
-MKMAN= no
+
+MAN=   mbr.8
 
 .include <bsd.own.mk>
 
diff -r 8189282fbdb8 -r 947b9c908b94 sbin/fdisk/mbr_bootsel/Makefile
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sbin/fdisk/mbr_bootsel/Makefile   Thu Apr 15 22:31:23 1999 +0000
@@ -0,0 +1,26 @@
+#      $NetBSD: Makefile,v 1.1 1999/04/15 22:31:23 fvdl Exp $
+
+BINDIR=        /usr/mdec
+BINMODE=444
+
+STRIPFLAG=
+
+PROG=  mbr_bootsel
+SRCS=  mbr_bootsel.S
+MKMAN= no
+
+.include <bsd.own.mk>
+
+.if ${OBJECT_FMT} == "ELF"
+LDFLAGS+= -e start
+.else
+LDFLAGS+= -e _start -N
+.endif
+
+${PROG}: ${OBJS}
+       ${LD} -o ${PROG}.tmp ${LDFLAGS} -Ttext 0x600 ${OBJS}
+       ${STRIPPROG} ${PROG}.tmp
+       objcopy -O binary ${PROG}.tmp ${PROG}
+       rm -f ${PROG}.tmp
+
+.include <bsd.prog.mk>
diff -r 8189282fbdb8 -r 947b9c908b94 sbin/fdisk/mbr_bootsel/mbr_bootsel.S
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sbin/fdisk/mbr_bootsel/mbr_bootsel.S      Thu Apr 15 22:31:23 1999 +0000
@@ -0,0 +1,516 @@
+/*     $NetBSD: mbr_bootsel.S,v 1.1 1999/04/15 22:31:23 fvdl Exp $     */
+
+
+/*-
+ * Copyright (c) 1999 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Frank van der Linden.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the NetBSD
+ *     Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Copyright (C) 1998 Wolfgang Solfrank.
+ * Copyright (C) 1998 TooLs GmbH.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by TooLs GmbH.
+ * 4. The name of TooLs GmbH may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * i386 master boot code
+ */
+
+#include <machine/asm.h>
+
+#define data32  .byte 0x66
+
+/*
+ * Gas can't emit 16 bit code. Define each instruction that we need where
+ * a 32-bit value (either data or addr) may be inserted in the generated
+ * code, or where we would need a prefix but can do without (saving some
+ * space).
+ */
+
+/*
+ * Register values used in the i386 instruction set
+ */
+#define AL     0
+#define BL     3
+#define CL     1
+#define DL     2
+#define AH     4
+#define BH     7
+#define CH     5
+#define DH     6
+
+#define AX     0
+#define BX     3
+#define CX     1
+#define DX     2
+#define SP     4
+#define BP     5
+#define SI     6
+#define DI     7
+
+#define SI_INDEX       4
+#define DI_INDEX       5
+#define BP_INDEX       7
+
+
+/*
+ * .. and the 16 bit instruction defines.
+ */
+#define call16(label)          .byte 0xe8 ; .word label - . - 2
+#define jmp16(label)           .byte 0xe9 ; .word label - . - 2
+#define jmpfar(segval,addr)    .byte 0xea ; .word addr ; .word segval
+
+#define movb_mem_al(mem)       .byte 0xa0 ; .word mem
+#define movb_al_mem(mem)       .byte 0xa2 ; .word mem
+
+#define movw_mem_ax(mem)       .byte 0xa1 ; .word mem
+#define movw_ax_mem(mem)       .byte 0xa3 ; .word mem
+
+#define movw_mem_reg(mem,reg) \
+       .byte 0x8b ; .byte (0x06 | ((reg) << 3) ; .word mem
+
+#define movw_imm_reg(imm,reg) \
+       .byte 0xb8 | reg ; .word imm
+
+#define movb_ireg0_reg(ireg,reg) .byte 0x8a ; .byte (reg << 3) | ireg
+#define movb_iregoff_reg(ireg,off,reg) \
+       .byte 0x8a ; .byte 0x40 | (reg << 3) | ireg ; .byte off
+#define movw_iregoff_reg(ireg,off,reg) \
+       .byte 0x8b ; .byte 0x40 | (reg << 3) | ireg ; .byte off
+
+#define movb_reg_mem(reg,mem) \
+       .byte 0x88 ; .byte 0x6 | (reg << 3) ; .word mem
+#define movb_mem_reg(mem,reg) \
+       .byte 0x8a ; .byte 0x6 | (reg << 3) ; .word mem
+
+#define movl_imm_ireg0(imm,ireg) \
+       .byte 0x66 ; .byte 0xc7 ; .byte ireg ; .long imm
+#define movl_imm_iregoff(imm,ireg,off) \
+       .byte 0x66 ; .byte 0xc7 ; .byte 0x40 | ireg ; .byte off ; .long imm
+
+#define cmp_imm_ax(imm)        .byte 0x3d ; .word imm
+
+#define cmpb_imm_ireg0(imm,reg) \
+       .byte 0x80 ; .byte 0x38 + reg ; .byte imm
+
+#define cmpb_imm_iregoff(imm,reg,off) \
+       .byte 0x80 ; .byte 0x78 + reg ; .byte off ; .byte imm
+
+#define cmpb_mem_reg(mem,reg) .byte 0x3a ; .byte 0x06 | (reg << 3) ; .word mem
+#define cmpw_imm_reg(imm,reg) .byte 0x81 ; .byte 0xf8 + reg ; .word imm
+
+#define and_imm_ax(imm)        .byte 0x25 ; .word imm
+
+
+
+#define        BOOTADDR        0x7c00
+
+/*
+ * Each entry in the boot select table is a nul-terminated string
+ * of 8 bytes (not including the 0). A zero-length string (i.e.
+ * the first char is 0) indicates an unused entry.
+ */
+#define PARTNAMESIZE   8
+#define TABENTRYSIZE   (PARTNAMESIZE + 1)
+#define NAMETABSIZE    4 * TABENTRYSIZE
+
+/*
+ * Flag defines. Currently only used to make the boot selector active
+ * or inactive. There may never be more because of space constraints.
+ */
+#define BFL_SELACTIVE  0x01
+
+/*
+ * Scan values for the various keys we use, as returned by the BIOS
+ */
+#define SCAN_ENTER     0x1c
+#define SCAN_F1                0x3b
+#define SCAN_F5                0x3f
+#define SCAN_F10       0x44
+
+/*
+ * Minimum and maximum drive number that is considered to be valid.
+ */
+#define MINDRV         0x80
+#define MAXDRV         0x88
+
+/*
+ * Error codes. Done this way to save space.
+ */
+#define ERR_INVPART    '1'             /* Invalid partition table */
+#define ERR_READ       '2'             /* Read error */
+#define ERR_NOOS       '3'             /* Magic no. check failed for part. */
+
+       .text
+/*
+ * Move ourselves out of the way first.
+ */
+ENTRY(start)
+       data32
+       xorl    %eax, %eax
+       movl    %ax, %ss
+       movl    $BOOTADDR, %sp
+       movl    %ax, %es
+       movl    %ax, %ds
+       xorl    %si,%si
+       movl    %sp, %si
+       movw_imm_reg(_C_LABEL(start),DI)
+       movw_imm_reg(0x100,CX)
+       rep
+       movsl
+       jmpfar(0,1f)
+/*
+ * Sanity check the drive number passed by the BIOS. Some BIOSs may not
+ * do this and pass garbage.
+ */
+1:
+       cmpb $MINDRV,%dl
+       jb 2f
+       cmpb $MAXDRV,%dl
+       jbe 3f
+2:
+       movb $0x80,%dl
+3: