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296167ae17
This patch adds Kconfig entries to control the early debugging options, currently in setup_64.c. Doing this via Kconfig rather than #defines means you can have one source tree, which is buildable for multiple platforms - and you can enable the correct early debug option for each platform via .config. I made udbg_early_init() a static inline because otherwise GCC is to daft to optimise it away when debugging is off. Now that we have udbg_init_rtas() we can make call_rtas_display_status* static. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
163 lines
3.2 KiB
C
163 lines
3.2 KiB
C
/*
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* polling mode stateless debugging stuff, originally for NS16550 Serial Ports
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*
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* c 2001 PPC 64 Team, IBM Corp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <stdarg.h>
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/console.h>
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#include <asm/processor.h>
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#include <asm/udbg.h>
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void (*udbg_putc)(char c);
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int (*udbg_getc)(void);
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int (*udbg_getc_poll)(void);
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/*
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* Early debugging facilities. You can enable _one_ of these via .config,
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* if you do so your kernel _will not boot_ on anything else. Be careful.
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*/
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void __init udbg_early_init(void)
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{
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#if defined(CONFIG_PPC_EARLY_DEBUG_LPAR)
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/* For LPAR machines that have an HVC console on vterm 0 */
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udbg_init_debug_lpar();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_G5)
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/* For use on Apple G5 machines */
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udbg_init_pmac_realmode();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS)
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/* RTAS panel debug */
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udbg_init_rtas();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE)
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/* Maple real mode debug */
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udbg_init_maple_realmode();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_ISERIES)
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/* For iSeries - hit Ctrl-x Ctrl-x to see the output */
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udbg_init_iseries();
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#endif
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}
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/* udbg library, used by xmon et al */
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void udbg_puts(const char *s)
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{
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if (udbg_putc) {
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char c;
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if (s && *s != '\0') {
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while ((c = *s++) != '\0')
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udbg_putc(c);
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}
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}
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#if 0
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else {
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printk("%s", s);
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}
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#endif
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}
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int udbg_write(const char *s, int n)
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{
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int remain = n;
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char c;
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if (!udbg_putc)
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return 0;
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if (s && *s != '\0') {
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while (((c = *s++) != '\0') && (remain-- > 0)) {
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udbg_putc(c);
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}
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}
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return n - remain;
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}
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int udbg_read(char *buf, int buflen)
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{
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char *p = buf;
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int i, c;
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if (!udbg_getc)
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return 0;
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for (i = 0; i < buflen; ++i) {
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do {
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c = udbg_getc();
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if (c == -1 && i == 0)
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return -1;
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} while (c == 0x11 || c == 0x13);
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if (c == 0 || c == -1)
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break;
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*p++ = c;
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}
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return i;
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}
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#define UDBG_BUFSIZE 256
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void udbg_printf(const char *fmt, ...)
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{
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char buf[UDBG_BUFSIZE];
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va_list args;
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va_start(args, fmt);
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vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
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udbg_puts(buf);
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va_end(args);
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}
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void __init udbg_progress(char *s, unsigned short hex)
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{
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udbg_puts(s);
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udbg_puts("\n");
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}
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/*
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* Early boot console based on udbg
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*/
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static void udbg_console_write(struct console *con, const char *s,
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unsigned int n)
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{
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udbg_write(s, n);
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}
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static struct console udbg_console = {
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.name = "udbg",
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.write = udbg_console_write,
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.flags = CON_PRINTBUFFER | CON_ENABLED,
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.index = -1,
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};
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static int early_console_initialized;
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void __init disable_early_printk(void)
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{
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#if 1
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if (!early_console_initialized)
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return;
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unregister_console(&udbg_console);
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early_console_initialized = 0;
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#endif
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}
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/* called by setup_system */
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void register_early_udbg_console(void)
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{
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if (early_console_initialized)
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return;
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early_console_initialized = 1;
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register_console(&udbg_console);
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}
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#if 0 /* if you want to use this as a regular output console */
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console_initcall(register_udbg_console);
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#endif
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