diff options
Diffstat (limited to 'sys/boot/pc98/boot2/boot1.S')
| -rw-r--r-- | sys/boot/pc98/boot2/boot1.S | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/sys/boot/pc98/boot2/boot1.S b/sys/boot/pc98/boot2/boot1.S new file mode 100644 index 0000000..e4f48eb --- /dev/null +++ b/sys/boot/pc98/boot2/boot1.S @@ -0,0 +1,395 @@ +/*- + * Copyright (c) 2008-2009 TAKAHASHI Yoshihiro + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + * + * $FreeBSD$ + */ + +/* Memory Locations */ + .set STACK_OFF,0x6000 # Stack offset + .set LOAD_SIZE,8192 # Load size + .set DAUA,0x0584 # DA/UA + .set MEM_REL,0x700 # Relocation address + .set MEM_ARG,0x900 # Arguments + .set MEM_BUF,0x8cec # Load area + .set MEM_BTX,0x9000 # BTX start + .set MEM_JMP,0x9010 # BTX entry point + .set MEM_USR,0xa000 # Client start + +/* PC98 machine type from sys/pc98/pc98/pc98_machdep.h */ + .set MEM_SYS, 0xa100 # System common area segment + .set PC98_MACHINE_TYPE, 0x0620 # PC98 machine type + .set EPSON_ID, 0x0624 # EPSON machine id + + .set M_NEC_PC98, 0x0001 + .set M_EPSON_PC98, 0x0002 + .set M_NOT_H98, 0x0010 + .set M_H98, 0x0020 + .set M_NOTE, 0x0040 + .set M_NORMAL, 0x1000 + .set M_8M, 0x8000 + +/* Partition Constants */ + .set PRT_OFF,0x1be # Partition offset + +/* Misc. Constants */ + .set SIZ_PAG,0x1000 # Page size + .set SIZ_SEC,0x200 # Sector size + + .set NSECT,0x10 + + .globl start + .globl read + .globl putc + .code16 + +start: jmp main + +boot_cyl: .org 4 + .ascii "IPL1 " + +main: cld + + /* Setup the stack */ + xor %si,%si + mov %si,%ss + mov $STACK_OFF,%sp + + push %cx + + /* Relocate ourself to MEM_REL */ + push %cs + pop %ds + mov %si,%es + mov $MEM_REL,%di + mov $SIZ_SEC,%cx + rep + movsb + + /* Transfer PC-9801 system common area */ + xor %ax,%ax + mov %ax,%si + mov %ax,%ds + mov %ax,%di + mov $MEM_SYS,%ax + mov %ax,%es + mov $0x0600,%cx + rep + movsb + + /* Transfer EPSON machine type */ + mov $0xfd00,%ax + mov %ax,%ds + mov (0x804),%eax + and $0x00ffffff,%eax + mov %eax,%es:(EPSON_ID) + + /* Set machine type to PC98_SYSTEM_PARAMETER */ +#ifdef SET_MACHINE_TYPE + call set_machine_type +#else + mov $M_NEC_PC98+M_NOT_H98,%eax + mov %eax,%es:(PC98_MACHINE_TYPE) +#endif + + /* Setup graphic screen */ + mov $0x42,%ah /* 640x400 */ + mov $0xc0,%ch + int $0x18 + mov $0x40,%ah /* graph on */ + int $0x18 + + /* Setup text screen */ + mov $0x0a00,%ax /* 80x25 */ + int $0x18 + mov $0x0c,%ah /* text on */ + int $0x18 + mov $0x13,%ah /* cursor home */ + xor %dx,%dx + int $0x18 + mov $0x11,%ah /* cursor on */ + int $0x18 + + /* Setup keyboard */ + mov $0x03,%ah + int $0x18 + + pop %cx + + /* bootstrap passes */ + xor %edi,%edi + mov %di,%ds + mov %di,%es + mov %cs,%bx + cmp $0x1fe0,%bx + jz boot_fd + cmp $0x1fc0,%bx + jnz boot_hd + xor %cx,%cx + mov (DAUA),%al + and $0xf0,%al + cmp $0x30,%al + jz boot_fd + cmp $0x90,%al + jnz boot_hd +boot_fd: xor %cx,%cx + jmp boot_load +boot_hd: test %cx,%cx + jnz boot_load + mov %cs:(boot_cyl),%cx +boot_load: mov %cx,MEM_ARG /* Save cylinder number */ + mov %cx,%di + xor %dx,%dx + mov $LOAD_SIZE,%bx + mov $MEM_BUF,%bp + push %cs + callw read + jc error + + /* Transfer boot2.bin */ + mov $MEM_BTX,%bx + mov 0xa(%bx),%si /* BTX size */ + add %bx,%si /* start of boot2.bin */ + mov $MEM_USR+SIZ_PAG*2,%di + mov $MEM_BTX+(NSECT-1)*SIZ_SEC,%cx + sub %si,%cx + rep + movsb + + /* Enable A20 */ + xor %ax,%ax + outb %al,$0xf2 + mov $0x02,%al + outb %al,$0xf6 + + /* Start BTX */ + ljmp $0x0000,$MEM_JMP + +/* + * Reads sectors from the disk. + * Call with: + * + * %bx - bytes to read + * %cx - cylinder + * %dh - head + * %dl - sector + * %edi - lba + * %es:(%bp) - buffer to read data into + */ +read: xor %ax,%ax + mov %ax,%ds + mov $0x06,%ah + mov (DAUA),%al + mov %ax,%si + and $0xf0,%al + cmp $0x30,%al /* 1.44MB FDD */ + jz read_fd + cmp $0x90,%al /* 1MB FDD */ + jz read_fd + cmp $0xa0,%al /* Is SCSI device? */ + jnz read_load + push %cx + mov %si,%cx + and $0x0f,%cl + inc %cl + mov (0x482),%ah + shr %cl,%ah /* Is SCSI HDD? */ + pop %cx + jc read_load + and $0xff7f,%si /* SCSI MO */ + mov %di,%cx + shr $16,%di + mov %di,%dx + jmp read_load +read_fd: or $0xd000,%si + or $0x0200,%cx + inc %dx +read_load: mov %si,%ax + int $0x1b + lret + +/* + * Print out the error message, wait for a keypress, and then reboot + * the machine. + */ +error: push %cs + pop %ds + mov $msg_eread,%si + call putstr + xor %ax,%ax /* Get keypress */ + int $0x18 + xor %ax,%ax /* CPU reset */ + outb %al,$0xf0 +halt: hlt + jmp halt /* Spin */ + +/* + * Display a null-terminated string. + */ +putstr.0: push %cs + callw putc +putstr: lodsb + test %al,%al + jne putstr.0 + ret + +/* + * Display a single char. + */ +putc: pusha + xor %dx,%dx + mov %dx,%ds + mov MEM_REL+cursor-start,%di + mov $0xa000,%bx + mov %bx,%es + mov $(80*2),%cx + + cmp $0x08,%al + je putc.bs + cmp $0x0d,%al + je putc.cr + cmp $0x0a,%al + je putc.lf + cmp $0x5c,%al /* \ */ + jne 1f + mov $0xfc,%al +1: movb $0xe1,%es:0x2000(%di) + stosw + jmp putc.scr +putc.bs: test %di,%di + jz putc.move + dec %di + dec %di + movb $0xe1,%es:0x2000(%di) + movw $0x20,%es:(%di) + jmp putc.move +putc.cr: mov %di,%ax + div %cx + sub %dx,%di + jmp putc.move +putc.lf: add %cx,%di +putc.scr: cmp $(80*2*25),%di /* Scroll screen */ + jb putc.move + push %ds + mov %bx,%ds + mov $(80*2),%si + xor %di,%di + mov $(80*24/2),%cx + rep + movsl + xor %ax,%ax + mov $0x20,%al + mov $80,%cl + rep + stosw + pop %ds + mov $(80*24*2),%di +putc.move: mov %di,MEM_REL+cursor-start /* Move cursor */ + mov $0x13,%ah + mov %di,%dx + int $0x18 + popa + lret + +cursor: .word 0 + +#ifdef SET_MACHINE_TYPE +/* + * Set machine type to PC98_SYSTEM_PARAMETER. + */ +set_machine_type: + xor %edx,%edx + mov %dx,%ds +// mov $MEM_SYS,%ax +// mov %ax,%es + + /* Wait V-SYNC */ +vsync.1: inb $0x60,%al + test $0x20,%al + jnz vsync.1 +vsync.2: inb $0x60,%al + test $0x20,%al + jz vsync.2 + + /* ANK 'A' font */ + xor %al,%al + outb %al,$0xa1 + mov $0x41,%al + outb %al,$0xa3 + + /* Get 'A' font from CG window */ + push %ds + mov $0xa400,%ax + mov %ax,%ds + xor %eax,%eax + xor %bx,%bx + mov $4,%cx +font.1: add (%bx),%eax + add $4,%bx + loop font.1 + pop %ds + cmp $0x6efc58fc,%eax + jnz m_epson + +m_pc98: or $M_NEC_PC98,%edx + mov $0x0458,%bx + mov (%bx),%al + test $0x80,%al + jz m_not_h98 + or $M_H98,%edx + jmp 1f +m_epson: or $M_EPSON_PC98,%edx +m_not_h98: or $M_NOT_H98,%edx + +1: inb $0x42,%al + test $0x20,%al + jz 1f + or $M_8M,%edx + +1: mov $0x0400,%bx + mov (%bx),%al + test $0x80,%al + jz 1f + or $M_NOTE,%edx + +1: mov $PC98_MACHINE_TYPE,%bx + mov %edx,%es:(%bx) + ret +#endif + +/* Messages */ + +msg_eread: .asciz "Error\r\n" + + .org PRT_OFF,0x90 + +/* Partition table */ + + .fill 0x30,0x1,0x0 + .byte 0x80, 0x00, 0x01, 0x00 + .byte 0xa5, 0xff, 0xff, 0xff + .byte 0x00, 0x00, 0x00, 0x00 + .byte 0x50, 0xc3, 0x00, 0x00 + + .word 0xaa55 # Magic number |
