not able to understand 'icedcc_putc'

[Chetan Nanda]

Hello,

I am newbie to ARM core. This might be a very silly question, but I am not
able to understand how 'icedcc_putc' function prints a character on console
(UART).

############3
static void icedcc_putc(int ch)
{
    int status, i = 0x4000000;

    do {
        if (--i < 0)
            return;

        asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status));
    } while (status & 2);

    asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch));
}
#############

Thanks for your help

~cnanda
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