This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / powerpc / kernel / udbg.c

diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c
new file mode 100644 (file)
index 0000000..3774e80
--- /dev/null
+++ b/arch/powerpc/kernel/udbg.c
@@ -0,0 +1,163 @@
+/*
+ * 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/config.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/console.h>
+#include <asm/processor.h>
+#include <asm/udbg.h>
+
+void (*udbg_putc)(char c);
+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_G5)
+       /* For use on Apple G5 machines */
+       udbg_init_pmac_realmode();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS)
+       /* RTAS panel debug */
+       udbg_init_rtas();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE)
+       /* Maple real mode debug */
+       udbg_init_maple_realmode();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_ISERIES)
+       /* For iSeries - hit Ctrl-x Ctrl-x to see the output */
+       udbg_init_iseries();
+#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 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);
+               }
+       }
+
+       return n - remain;
+}
+
+int udbg_read(char *buf, int buflen)
+{
+       char *p = buf;
+       int i, c;
+
+       if (!udbg_getc)
+               return 0;
+
+       for (i = 0; i < buflen; ++i) {
+               do {
+                       c = udbg_getc();
+                       if (c == -1 && i == 0)
+                               return -1;
+
+               } while (c == 0x11 || c == 0x13);
+               if (c == 0 || c == -1)
+                       break;
+               *p++ = c;
+       }
+
+       return i;
+}
+
+#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,
+       .index  = -1,
+};
+
+static int early_console_initialized;
+
+void __init disable_early_printk(void)
+{
+#if 1
+       if (!early_console_initialized)
+               return;
+       unregister_console(&udbg_console);
+       early_console_initialized = 0;
+#endif
+}
+
+/* called by setup_system */
+void register_early_udbg_console(void)
+{
+       if (early_console_initialized)
+               return;
+       early_console_initialized = 1;
+       register_console(&udbg_console);
+}
+
+#if 0   /* if you want to use this as a regular output console */
+console_initcall(register_udbg_console);
+#endif