arch/ppc-sam440/kernel/maygetchar.c

   1 #include <aros/kernel.h>
   2
   3 #include <kernel_base.h>
   4 #include <kernel_debug.h>
   5
   6 #include <asm/amcc440.h>
   7 #include <asm/io.h>
   8
   9 /*****************************************************************************
  10
  11     NAME */
  12 #include <proto/kernel.h>
  13
  14 AROS_LH0(int, KrnMayGetChar,
  15
  16 /*  SYNOPSIS */
  17
  18 /*  LOCATION */
  19         struct KernelBase *, KernelBase, 26, Kernel)
  20
  21 /*  FUNCTION
  22         Read a single character from low-level debug input stream
  23
  24     INPUTS
  25         None
  26
  27     RESULT
  28         An ASCII code of the character or -1 if there's no character
  29         available
  30
  31     NOTES
  32         This function never waits. If there is no character available on
  33         the stream it just returns with -1
  34
  35     EXAMPLE
  36
  37     BUGS
  38
  39     SEE ALSO
  40
  41     INTERNALS
  42
  43 ******************************************************************************/
  44 {
  45     AROS_LIBFUNC_INIT
  46
  47     if (inb(UART0_LSR) & UART_LSR_DR)
  48         return inb(UART0_RBR);
  49
  50     return -1;
  51
  52     AROS_LIBFUNC_EXIT
  53 }