console_32.c

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/*
 * console.c: Routines that deal with sending and receiving IO
 *            to/from the current console device using the PROM.
 *
 * Copyright (C) 1995 David S. Miller ([email protected])
 * Copyright (C) 1998 Pete Zaitcev <[email protected]>
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <linux/string.h>

extern void restore_current(void);

/* Non blocking put character to console device, returns -1 if
 * unsuccessful.
 */
static int prom_nbputchar(const char *buf)
{
    unsigned long flags;
    int i = -1;

    spin_lock_irqsave(&prom_lock, flags);
    switch(prom_vers) {
    case PROM_V0:
        if ((*(romvec->pv_nbputchar))(*buf))
            i = 1;
        break;
    case PROM_V2:
    case PROM_V3:
        if ((*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout,
                              buf, 0x1) == 1)
            i = 1;
        break;
    default:
        break;
    }
    restore_current();
    spin_unlock_irqrestore(&prom_lock, flags);
    return i; /* Ugh, we could spin forever on unsupported proms ;( */
}

void prom_console_write_buf(const char *buf, int len)
{
    while (len) {
        int n = prom_nbputchar(buf);
        if (n < 0)
            continue;
        len--;
        buf++;
    }
}