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*
* Video mode setup, etc. for NEC PC-9800 series.
*
* Copyright (C) 1997,98,99 Linux/98 project <seraphim@kmc.kyoto-u.ac.jp>
*
* Based on the video.S for IBM PC:
* copyright (C) Martin Mares <mj@atrey.karlin.mff.cuni.cz>
*/
/* Positions of various video parameters passed to the kernel */
/* (see also include/linux/tty.h) */
#define PARAM_CURSOR_POS 0x00
#define PARAM_VIDEO_PAGE 0x04
#define PARAM_VIDEO_MODE 0x06
#define PARAM_VIDEO_COLS 0x07
#define PARAM_VIDEO_EGA_BX 0x0a
#define PARAM_VIDEO_LINES 0x0e
#define PARAM_HAVE_VGA 0x0f
#define PARAM_FONT_POINTS 0x10
#define PARAM_VIDEO98_COMPAT 0x0a
#define PARAM_VIDEO98_HIRESO 0x0b
#define PARAM_VIDEO98_MACHTYPE 0x0c
#define PARAM_VIDEO98_LINES 0x0e
#define PARAM_VIDEO98_COLS 0x0f
# PARAM_LFB_* and PARAM_VESAPM_* are unused on PC-9800.
# This is the main entry point called by setup.S
# %ds *must* be pointing to the bootsector
video: xorw %ax, %ax
movw %ax, %es # %es = 0
movb %es:BIOS_FLAG, %al
movb %al, PARAM_VIDEO_MODE
movb $0, PARAM_VIDEO98_HIRESO # 0 = normal
movw $NORMAL_TEXT, PARAM_VIDEO_PAGE
testb $0x8, %al
movw $(80 * 256 + 25), %ax
jz 1f
# hireso machine.
movb $1, PARAM_VIDEO98_HIRESO # !0 = hi-reso
movb $(HIRESO_TEXT >> 8), PARAM_VIDEO_PAGE + 1
movw $(80 * 256 + 31), %ax
1: movw %ax, PARAM_VIDEO98_LINES # also sets VIDEO98_COLS
movb $0xc0, %ch # 400-line graphic mode
movb $0x42, %ah
int $0x18
movw $80, PARAM_VIDEO_COLS
movw $msg_probing, %si
call prtstr_cs
# Check vendor from font pattern of `A'...
1: inb $0x60, %al # wait V-sync
testb $0x20, %al
jnz 1b
2: inb $0x60, %al
testb $0x20, %al
jz 2b
movb $0x00, %al # select font of `A'
outb %al, $0xa1
movb $0x41, %al
outb %al, $0xa3
movw $8, %cx
movw PARAM_VIDEO_PAGE, %ax
cmpw $NORMAL_TEXT, %ax
je 3f
movb $24, %cl # for hi-reso machine
3: addw $0x400, %ax # %ax = CG window segment
pushw %ds
movw %ax, %ds
xorw %dx, %dx # get sum of `A' pattern...
xorw %si, %si
4: lodsw
addw %ax, %dx
loop 4b
popw %ds
movw %dx, %ax
movw $msg_nec, %si
xorw %bx, %bx # vendor info will go into %bx
testb $8, %es:BIOS_FLAG
jnz check_hireso_vendor
cmpw $0xc7f8, %ax
je 5f
jmp 6f
check_hireso_vendor:
cmpw $0x9639, %ax # XXX: NOT VERIFIED!!!
je 5f
6: incw %bx # compatible machine
movw $msg_compat, %si
5: movb %bl, PARAM_VIDEO98_COMPAT
call prtstr_cs
movw $msg_fontdata, %si
call prtstr_cs # " (CG sum of A = 0x"
movw %dx, %ax
call prthex
call prtstr_cs # ") PC-98"
movb $'0', %al
pushw %ds
pushw $0xf8e8
popw %ds
cmpw $0x2198, (0)
popw %ds
jne 7f
movb $'2', %al
7: call prtchr
call prtstr_cs # "1 "
movb $0, PARAM_VIDEO98_MACHTYPE
#if 0 /* XXX - This check is bogus? [0000:BIOS_FLAG2]-bit7 does NOT
indicate whether it is a note machine, but merely indicates
whether it has ``RAM drive''. */
# check note machine
testb $0x80, %es:BIOS_FLAG2
jnz is_note
pushw %ds
pushw $0xfd80
popw %ds
movb (4), %al
popw %ds
cmpb $0x20, %al # EPSON note A
je epson_note
cmpb $0x22, %al # EPSON note W
je epson_note
cmpb $0x27, %al # EPSON note AE
je epson_note
cmpb $0x2a, %al # EPSON note WR
jne note_done
epson_note:
movb $1, PARAM_VIDEO98_MACHTYPE
movw $msg_note, %si
call prtstr_cs
note_done:
#endif
# print h98 ? (only NEC)
cmpb $0, PARAM_VIDEO98_COMPAT
jnz 8f # not NEC -> not H98
testb $0x80, %es:BIOS_FLAG5
jz 8f # have NESA bus -> H98
movw $msg_h98, %si
call prtstr_cs
orb $2, PARAM_VIDEO98_MACHTYPE
8: testb $0x40, %es:BIOS_FLAG5
jz 9f
movw $msg_gs, %si
call prtstr_cs # only prints it :-)
9:
movw $msg_normal, %si # "normal"
testb $0x8, %es:BIOS_FLAG
jz 1f
movw $msg_hireso, %si
1: call prtstr_cs
movw $msg_sysclk, %si
call prtstr_cs
movb $'5', %al
testb $0x80, %es:BIOS_FLAG
jz 2f
movb $'8', %al
2: call prtchr
call prtstr_cs
#if 0
testb $0x40, %es:(0x45c)
jz no_30line # no 30-line support
movb %es:KB_SHFT_STS, %al
testb $0x01, %al # is SHIFT key pressed?
jz no_30line
testb $0x10, %al # is CTRL key pressed?
jnz line40
# switch to 30-line mode
movb $30, PARAM_VIDEO98_LINES
movw $msg_30line, %si
jmp 3f
line40:
movb $37, PARAM_VIDEO98_LINES
movw $40, PARAM_VIDEO_LINES
movw $msg_40line, %si
3: call prtstr_cs
movb $0x32, %bh
movw $0x300c, %ax
int $0x18 # switch video mode
movb $0x0c, %ah
int $0x18 # turn on text plane
movw %cs:cursor_address, %dx
movb $0x13, %ah
int $0x18 # move cursor to correct place
mov $0x11, %ah
int $0x18 # turn on text plane
call prtstr_cs # "Ok.\r\n"
no_30line:
#endif
ret
prtstr_cs:
pushw %ds
pushw %cs
popw %ds
call prtstr
popw %ds
ret
# prthex is for debugging purposes, and prints %ax in hexadecimal.
prthex: pushw %cx
movw $4, %cx
1: rolw $4, %ax
pushw %ax
andb $0xf, %al
cmpb $10, %al
sbbb $0x69, %al
das
call prtchr
popw %ax
loop 1b
popw %cx
ret
msg_probing: .string "Probing machine: "
msg_nec: .string "NEC"
msg_compat: .string "compatible"
msg_fontdata: .string " (CG sum of A = 0x"
.string ") PC-98"
.string "1 "
msg_gs: .string "(GS) "
msg_h98: .string "(H98) "
msg_normal: .string "normal"
msg_hireso: .string "Hi-reso"
msg_sysclk: .string " mode, system clock "
.string "MHz\r\n"
#if 0
msg_40line: # cpp will concat following lines, so the assembler can deal.
.ascii "\
Video mode will be adjusted to 37-line (so-called ``40-line'') mode later.\r\n\
THIS MODE MAY DAMAGE YOUR MONITOR PHYSICALLY. USE AT YOUR OWN RISK.\r\n"
msg_30line: .string "Switching video mode to 30-line (640x480) mode... "
.string "Ok.\r\n"
#endif
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