hypervisor/arch/arm/dbg-write.c

   1 /*
   2  * Jailhouse, a Linux-based partitioning hypervisor
   3  *
   4  * Copyright (c) ARM Limited, 2014
   5  *
   6  * Authors:
   7  *  Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  */
  12
  13 #include <jailhouse/entry.h>
  14 #include <jailhouse/printk.h>
  15 #include <jailhouse/processor.h>
  16 #include <asm/debug.h>
  17 #include <asm/platform.h>
  18
  19 static struct uart_chip uart;
  20
  21 void arch_dbg_write_init(void)
  22 {
  23         /* FIXME: parse a device tree */
  24         uart.baudrate = 115200;
  25         uart.fifo_enabled = true;
  26         uart.virt_base = hypervisor_header.debug_uart_base;
  27
  28         uart_chip_init(&uart);
  29 }
  30
  31 void arch_dbg_write(const char *msg)
  32 {
  33         char c = 0;
  34
  35         while (1) {
  36                 if (c == '\n')
  37                         c = '\r';
  38                 else
  39                         c = *msg++;
  40                 if (!c)
  41                         break;
  42
  43                 uart.wait(&uart);
  44                 if (panic_in_progress && panic_cpu != phys_processor_id())
  45                         break;
  46                 uart.write(&uart, c);
  47                 uart.busy(&uart);
  48         }
  49 }