arch/arm-raspi/kernel/maygetchar.c

   1 /*
   2     Copyright © 2013, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <aros/kernel.h>
   7
   8 #include <asm/bcm2835.h>
   9 #include <hardware/pl011uart.h>
  10
  11 #include <kernel_base.h>
  12 #include <kernel_debug.h>
  13
  14 #include <proto/kernel.h>
  15
  16 /* See rom/kernel/maygetchar.c for documentation */
  17
  18 AROS_LH0(int, KrnMayGetChar,
  19     struct KernelBase *, KernelBase, 26, Kernel)
  20 {
  21     AROS_LIBFUNC_INIT
  22
  23     if ((*(volatile uint32_t *)(PL011_0_BASE + PL011_FR) & PL011_FR_RXFE) == 0)
  24         return (int)*(volatile uint32_t *)(PL011_0_BASE + PL011_DR);
  25
  26     return -1;
  27
  28     AROS_LIBFUNC_EXIT
  29 }