+# pcboot - bootable PC demo/game kernel
+# Copyright (C) 2018 John Tsiombikas <nuclear@member.fsf.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+
.code16
.section .boot,"a"
mov $_boot2_size, %eax
call print_num
+ mov $_boot2_size, %eax
mov %eax, %ebx
shr $9, %eax
and $0x1ff, %ebx
.set ARG_SIDX, 4
loading_msg: .asciz "\nLoad "
-driveno_msg: .asciz "Drive: "
+driveno_msg: .asciz "Drv:"
sect_per_track: .short 18
num_cylinders: .short 80
pop %bp
ret
-str_read_error: .asciz "rderr: "
+str_read_error: .asciz "rderr:"
abort_read:
mov $str_read_error, %si
# expects character in al
print_char:
push %es
- pushw $0xb800
+
+ push %ax
+ cmp $10, %ax
+ jnz 0f
+ mov $32, %ax
+
+0: pushw $0xb800
pop %es
movw cursor_x, %di
shl $1, %di
movb $7, %es:1(%di)
incw cursor_x
+ pop %ax
call ser_putchar
pop %es
ret
.set DIV_9600, 115200 / 9600
.set LCTL_8N1, 0x03
.set LCTL_DLAB, 0x80
- .set FIFO_ENABLE, 0x01
- .set FIFO_SEND_CLEAR, 0x04
- .set FIFO_RECV_CLEAR, 0x02
- .set MCTL_DTR, 0x01
- .set MCTL_RTS, 0x02
- .set MCTL_OUT2, 0x08
+ .set FIFO_ENABLE_CLEAR, 0x07
+ .set MCTL_DTR_RTS_OUT2, 0x0b
.set LST_TREG_EMPTY, 0x20
setup_serial:
mov $UART_LCTL, %dx
out %al, %dx
# clear and enable fifo
- mov $FIFO_ENABLE, %al
- or $FIFO_SEND_CLEAR, %al
- or $FIFO_RECV_CLEAR, %al
+ mov $FIFO_ENABLE_CLEAR, %al
mov $UART_FIFO, %dx
out %al, %dx
# assert RTS and DTR
- mov $MCTL_DTR, %al
- or $MCTL_RTS, %al
- or $MCTL_OUT2, %al
+ mov $MCTL_DTR_RTS_OUT2, %al
mov $UART_MCTL, %dx
out %al, %dx
ret