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Annotation of qemu/roms/SLOF/llfw/clib/iolib.c, revision 1.1

1.1     ! root        1: /******************************************************************************
        !             2:  * Copyright (c) 2004, 2008 IBM Corporation
        !             3:  * All rights reserved.
        !             4:  * This program and the accompanying materials
        !             5:  * are made available under the terms of the BSD License
        !             6:  * which accompanies this distribution, and is available at
        !             7:  * http://www.opensource.org/licenses/bsd-license.php
        !             8:  *
        !             9:  * Contributors:
        !            10:  *     IBM Corporation - initial implementation
        !            11:  *****************************************************************************/
        !            12: 
        !            13: #include <stdint.h>
        !            14: #include <stddef.h>
        !            15: #include <unistd.h>
        !            16: #include "iolib.h"
        !            17: 
        !            18: void uart_send_byte(unsigned char b)
        !            19: {
        !            20:        asm volatile ("":::"3","4","5","6","7");
        !            21:        io_putchar(b);
        !            22: }
        !            23: 
        !            24: /**
        !            25:  * Standard write function for the libc.
        !            26:  *
        !            27:  * @param fd   file descriptor (should always be 1 or 2)
        !            28:  * @param buf  pointer to the array with the output characters
        !            29:  * @param count        number of bytes to be written
        !            30:  * @return     the number of bytes that have been written successfully
        !            31:  */
        !            32: ssize_t write(int fd, const void *buf, size_t count)
        !            33: {
        !            34:        size_t i;
        !            35:        char *ptr = (char *)buf;
        !            36: 
        !            37:        if (fd != 1 && fd != 2)
        !            38:                return 0;
        !            39: 
        !            40:        for (i = 0; i < count; i++) {
        !            41:                if (*ptr == '\n')
        !            42:                        uart_send_byte('\r');
        !            43:                uart_send_byte(*ptr++);
        !            44:        }
        !            45: 
        !            46:        return i;
        !            47: }
        !            48: 
        !            49: 
        !            50: /**
        !            51:  * @brief C-routine to delay for a number of milliseconds.
        !            52:  * @param delay interval in terms of ms
        !            53:  */
        !            54: void delay_ms( unsigned int ms )
        !            55: {
        !            56:        uint32_t ticks_per_ms;
        !            57:        
        !            58:        ticks_per_ms = tb_frequency() / 1000;
        !            59: 
        !            60:        while (0 < ms) {
        !            61:                set_dec(ticks_per_ms);
        !            62:                while( ((get_dec()) & 0x80000000) == 0 );
        !            63:                ms--;
        !            64:        }
        !            65: }

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