text: /*
   * polling mode stateless debugging stuff, originally for NS16550 Serial Ports
   *
   * c 2001 PPC 64 Team, IBM Corp
   *
   *      This program is free software; you can redistribute it and/or
   *      modify it under the terms of the GNU General Public License
   *      as published by the Free Software Foundation; either version
   *      2 of the License, or (at your option) any later version.
   */
  
  #include <stdarg.h>
  #include <linux/types.h>
  #include <linux/sched.h>
  #include <linux/console.h>
  #include <linux/init.h>
  #include <asm/processor.h>
  #include <asm/udbg.h>
  
  void (*udbg_putc)(char c);
  void (*udbg_flush)(void);
  int (*udbg_getc)(void);
  int (*udbg_getc_poll)(void);
  
  /*
   * Early debugging facilities. You can enable _one_ of these via .config,
   * if you do so your kernel _will not boot_ on anything else. Be careful.
   */
  void __init udbg_early_init(void)
  {
  #if defined(CONFIG_PPC_EARLY_DEBUG_LPAR)
  	/* For LPAR machines that have an HVC console on vterm 0 */
  	udbg_init_debug_lpar();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI)
  	/* For LPAR machines that have an HVSI console on vterm 0 */
  	udbg_init_debug_lpar_hvsi();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_G5)
  	/* For use on Apple G5 machines */
  	udbg_init_pmac_realmode();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL)
  	/* RTAS panel debug */
  	udbg_init_rtas_panel();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE)
  	/* RTAS console debug */
  	udbg_init_rtas_console();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE)
  	/* Maple real mode debug */
  	udbg_init_maple_realmode();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_BEAT)
  	udbg_init_debug_beat();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_PAS_REALMODE)
  	udbg_init_pas_realmode();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_BOOTX)
  	udbg_init_btext();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_44x)
  	/* PPC44x debug */
  	udbg_init_44x_as1();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_40x)
  	/* PPC40x debug */
  	udbg_init_40x_realmode();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_CPM)
  	udbg_init_cpm();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_USBGECKO)
  	udbg_init_usbgecko();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_MEMCONS)
  	/* In memory console */
  	udbg_init_memcons();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC)
  	udbg_init_ehv_bc();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_PS3GELIC)
  	udbg_init_ps3gelic();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_RAW)
  	udbg_init_debug_opal_raw();
  #elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI)
  	udbg_init_debug_opal_hvsi();
  #endif
  
  #ifdef CONFIG_PPC_EARLY_DEBUG
  	console_loglevel = 10;
  
  	register_early_udbg_console();
  #endif
  }
  
  /* udbg library, used by xmon et al */
  void udbg_puts(const char *s)
  {
  	if (udbg_putc) {
  		char c;
  
  		if (s && *s != '\0') {
  			while ((c = *s++) != '\0')
  				udbg_putc(c);
  		}
  
  		if (udbg_flush)
  			udbg_flush();
  	}
  #if 0
  	else {
  		printk("%s", s);
  	}
  #endif
  }
  
  int udbg_write(const char *s, int n)
  {
  	int remain = n;
  	char c;
  
  	if (!udbg_putc)
  		return 0;
  
  	if (s && *s != '\0') {
  		while (((c = *s++) != '\0') && (remain-- > 0)) {
  			udbg_putc(c);
  		}
  	}
  
  	if (udbg_flush)
  		udbg_flush();
  
  	return n - remain;
  }
  
  #define UDBG_BUFSIZE 256
  void udbg_printf(const char *fmt, ...)
  {
  	char buf[UDBG_BUFSIZE];
  	va_list args;
  
  	va_start(args, fmt);
  	vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
  	udbg_puts(buf);
  	va_end(args);
  }
  
  void __init udbg_progress(char *s, unsigned short hex)
  {
  	udbg_puts(s);
  	udbg_puts("\n");
  }
  
  /*
   * Early boot console based on udbg
   */
  static void udbg_console_write(struct console *con, const char *s,
  		unsigned int n)
  {
  	udbg_write(s, n);
  }
  
  static struct console udbg_console = {
  	.name	= "udbg",
  	.write	= udbg_console_write,
  	.flags	= CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME,
  	.index	= 0,
  };
  
  /*
   * Called by setup_system after ppc_md->probe and ppc_md->early_init.
   * Call it again after setting udbg_putc in ppc_md->setup_arch.
   */
  void __init register_early_udbg_console(void)
  {
  	if (early_console)
  		return;
  
  	if (!udbg_putc)
  		return;
  
  	if (strstr(boot_command_line, "udbg-immortal")) {
  		printk(KERN_INFO "early console immortal !\n");
  		udbg_console.flags &= ~CON_BOOT;
  	}
  	early_console = &udbg_console;
  	register_console(&udbg_console);
  }
  
  #if 0   /* if you want to use this as a regular output console */
  console_initcall(register_udbg_console);
  #endif
  