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Annotation of qemu/roms/qemu-palcode/uart.c, revision 1.1

1.1     ! root        1: /*****************************************************************************
        !             2: 
        !             3:        Copyright � 1995, 1996 Digital Equipment Corporation,
        !             4:                        Maynard, Massachusetts.
        !             5: 
        !             6:                         All Rights Reserved
        !             7: 
        !             8: Permission to use, copy, modify, and distribute this software and its 
        !             9: documentation for any purpose and without fee is hereby granted, provided  
        !            10: that the copyright notice and this permission notice appear in all copies  
        !            11: of software and supporting documentation, and that the name of Digital not  
        !            12: be used in advertising or publicity pertaining to distribution of the software 
        !            13: without specific, written prior permission. Digital grants this permission 
        !            14: provided that you prominently mark, as not part of the original, any 
        !            15: modifications made to this software or documentation.
        !            16: 
        !            17: Digital Equipment Corporation disclaims all warranties and/or guarantees  
        !            18: with regard to this software, including all implied warranties of fitness for 
        !            19: a particular purpose and merchantability, and makes no representations 
        !            20: regarding the use of, or the results of the use of, the software and 
        !            21: documentation in terms of correctness, accuracy, reliability, currentness or
        !            22: otherwise; and you rely on the software, documentation and results solely at 
        !            23: your own risk. 
        !            24: 
        !            25: ******************************************************************************/
        !            26: 
        !            27: /*
        !            28:  * [email protected]
        !            29:  *
        !            30:  * Modified for QEMU PALcode by [email protected].
        !            31:  */
        !            32: 
        !            33: #include "protos.h"
        !            34: #include "uart.h"
        !            35: 
        !            36: #ifndef SERIAL_SPEED
        !            37: #define SERIAL_SPEED 9600
        !            38: #endif
        !            39: 
        !            40: int
        !            41: uart_charav(int offset)
        !            42: {
        !            43:        return inb(com2Lsr + offset) & 1;
        !            44: }
        !            45: 
        !            46: int
        !            47: uart_getchar(int offset)
        !            48: {
        !            49:        /* If interrupts are enabled, use wtint assuming that either the
        !            50:           device itself will wake us, or that a clock interrupt will.  */
        !            51:        if ((rdps() & 7) == 0) {
        !            52:            while (!uart_charav(offset)) {
        !            53:                wtint(0);
        !            54:            }
        !            55:        } else {
        !            56:            while (!uart_charav(offset))
        !            57:                continue;
        !            58:        }
        !            59: 
        !            60:        return inb(com2Rbr + offset);
        !            61: }
        !            62: 
        !            63: void
        !            64: uart_putchar_raw(int offset, char c)
        !            65: {
        !            66:        while ((inb(com2Lsr + offset) & 0x20) == 0)
        !            67:                continue;
        !            68:        outb(c, com2Thr + offset);
        !            69: }
        !            70: 
        !            71: void
        !            72: uart_putchar(int offset, char c)
        !            73: {
        !            74:        if (c == '\n')
        !            75:                uart_putchar_raw(offset, '\r');
        !            76:        uart_putchar_raw(offset, c);
        !            77: }
        !            78: 
        !            79: void
        !            80: uart_puts(int offset, const char *s)
        !            81: {
        !            82:        while (*s != '\0')
        !            83:                uart_putchar(offset, *s++);
        !            84: }
        !            85: 
        !            86: void
        !            87: uart_init_line(int offset, int baud)
        !            88: {
        !            89:        int i;
        !            90:        int baudconst;
        !            91: 
        !            92:        switch (baud) {
        !            93:        case 56000:
        !            94:                baudconst = 2;
        !            95:                break;
        !            96:        case 38400:
        !            97:                baudconst = 3;
        !            98:                break;
        !            99:        case 19200:
        !           100:                baudconst = 6;
        !           101:                break;
        !           102:        case 9600:
        !           103:                baudconst = 12;
        !           104:                break;
        !           105:        case 4800:
        !           106:                baudconst = 24;
        !           107:                break;
        !           108:        case 2400:
        !           109:                baudconst = 48;
        !           110:                break;
        !           111:        case 1200:
        !           112:                baudconst = 96;
        !           113:                break;
        !           114:        case 300:
        !           115:                baudconst = 384;
        !           116:                break;
        !           117:        case 150:
        !           118:                baudconst = 768;
        !           119:                break;
        !           120:        default:
        !           121:                baudconst = 12;
        !           122:                break;
        !           123:        }
        !           124: 
        !           125: 
        !           126:        outb(0x87, com2Lcr + offset);
        !           127:        outb(0, com2Dlm + offset);
        !           128:        outb(baudconst, com2Dll + offset);
        !           129:        outb(0x07, com2Lcr + offset);
        !           130:        outb(0x0F, com2Mcr + offset);
        !           131: 
        !           132:        for (i = 10; i > 0; i--) {
        !           133:                if (inb(com2Lsr + offset) == 0)
        !           134:                        break;
        !           135:                inb(com2Rbr + offset);
        !           136:        }
        !           137: }
        !           138: 
        !           139: void uart_init(void)
        !           140: {
        !           141:        uart_init_line(COM1, SERIAL_SPEED);
        !           142:        uart_init_line(COM2, SERIAL_SPEED);
        !           143: }

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