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Annotation of qemu/roms/SLOF/llfw/clib/iolib.c, revision 1.1.1.1

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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