1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
201 lines
5.2 KiB
ArmAsm
201 lines
5.2 KiB
ArmAsm
/*
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* Mach Operating System
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* Copyright (c) 1992, 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*
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* from: Mach, Revision 2.2 92/04/04 11:34:26 rpd
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* $FreeBSD$
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*/
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/*
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Copyright 1988, 1989, 1990, 1991, 1992
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by Intel Corporation, Santa Clara, California.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appears in all
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copies and that both the copyright notice and this permission notice
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appear in supporting documentation, and that the name of Intel
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not be used in advertising or publicity pertaining to distribution
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of the software without specific, written prior permission.
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INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
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IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Serial bootblock interface routines
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* Copyright (c) 1994, J"org Wunsch
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* THE AUTHOR ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. THE AUTHOR DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*/
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.file "serial.s"
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#include "asm.h"
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#include "../../isa/sioreg.h"
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.text
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/*
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* The serial port interface routines implement a simple polled i/o
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* interface to a standard serial port. Due to the space restrictions
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* for the boot blocks, no BIOS support is used (since BIOS requires
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* expensive real/protected mode switches), instead the rudimentary
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* BIOS support is duplicated here.
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*
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* The base address for the i/o port is passed from the Makefile in
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* the COMCONSOLE preprocessor macro. Console parameters are currently
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* hard-coded to CONSPEED (9600) Bd, 8 bit. This can be changed in the
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* init_serial() function.
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*/
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/*
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* void serial_putc(ch) char ch;
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* send ch to serial port
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*
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*/
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ENTRY(serial_putc)
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push %ebp
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mov %esp, %ebp
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push %edx
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mov $COMCONSOLE + 5, %edx # line status reg
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1: inb %dx, %al
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test $0x20, %al
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jz 1b # TX buffer not empty
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movb 0x8(%ebp), %al
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sub $5, %edx # TX output reg
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outb %al, %dx # send this one
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pop %edx
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pop %ebp
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ret
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/*
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* int serial_getc(void)
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* read a character from serial port
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*/
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ENTRY(serial_getc)
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push %ebp
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mov %esp, %ebp
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push %edx
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mov $COMCONSOLE + 5, %edx # line status reg
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1:
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inb %dx, %al
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testb $0x01, %al
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jz 1b # no RX char available
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xor %eax, %eax
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sub $5, %edx # RX buffer reg
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inb %dx, %al # fetch (first) character
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and $0x7F, %eax # remove any parity bits we get
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cmp $0x7F, %eax # make DEL...
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jne 2f
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mov $0x08, %eax # look like BS
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2:
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pop %edx
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pop %ebp
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ret
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/*
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* int serial_ischar(void)
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* if there is a character pending, return true; otherwise return 0
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*/
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ENTRY(serial_ischar)
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push %ebp
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mov %esp, %ebp
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push %edx
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xorl %eax, %eax
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mov $COMCONSOLE + 5, %edx # line status reg
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inb %dx, %al
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andb $0x01, %al # RX char available?
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pop %edx
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pop %ebp
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ret
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/*
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* void init_serial(void)
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* initialize the serial console port to 9600 Bd, 8 bpc
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*/
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ENTRY(init_serial)
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push %ebp
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mov %esp, %ebp
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push %edx
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mov $COMCONSOLE + 3, %edx # line control reg
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movb $0x80, %al
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outb %al, %dx # enable DLAB
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sub $3, %edx # divisor latch, low byte
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mov $COMBRD(CONSPEED), %ax # 9600 Bd by default
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outb %al, %dx
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inc %edx # divisor latch, high byte
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movb %ah, %al
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outb %al, %dx
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add $2, %edx # line control reg
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movb $0x13, %al
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outb %al, %dx # 8 bit, no parity, 1 stop bit
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inc %edx # modem control reg
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mov $3, %al
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outb %al, %dx # enable DTR/RTS
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/* now finally, flush the input buffer */
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inc %edx # line status reg
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1:
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inb %dx, %al
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testb $0x01, %al
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jz 2f # no more characters buffered
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sub $5, %edx # rx buffer reg
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inb %dx, %al # throw away
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add $5, %edx
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jmp 1b
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2:
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pop %edx
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pop %ebp
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ret
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