1 files changed, 187 insertions, 0 deletions

diff --git a/arch/powerpc/xmon/start_64.c b/arch/powerpc/xmon/start_64.c
new file mode 100644
index 000000000000..e50c158191e1
--- /dev/null
+++ b/arch/powerpc/xmon/start_64.c
@@ -0,0 +1,187 @@
+/*
+ * Copyright (C) 1996 Paul Mackerras.
+ *
+ *      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 <linux/config.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/sysrq.h>
+#include <linux/init.h>
+#include <asm/machdep.h>
+#include <asm/io.h>
+#include <asm/page.h>
+#include <asm/prom.h>
+#include <asm/processor.h>
+#include <asm/udbg.h>
+#include <asm/system.h>
+#include "nonstdio.h"
+
+#ifdef CONFIG_MAGIC_SYSRQ
+
+static void sysrq_handle_xmon(int key, struct pt_regs *pt_regs,
+                              struct tty_struct *tty) 
+{
+        /* ensure xmon is enabled */
+        xmon_init(1);
+        debugger(pt_regs);
+}
+
+static struct sysrq_key_op sysrq_xmon_op = 
+{
+        .handler =      sysrq_handle_xmon,
+        .help_msg =     "Xmon",
+        .action_msg =   "Entering xmon",
+};
+
+static int __init setup_xmon_sysrq(void)
+{
+        register_sysrq_key('x', &sysrq_xmon_op);
+        return 0;
+}
+__initcall(setup_xmon_sysrq);
+#endif /* CONFIG_MAGIC_SYSRQ */
+
+int
+xmon_write(void *handle, void *ptr, int nb)
+{
+        return udbg_write(ptr, nb);
+}
+
+int
+xmon_read(void *handle, void *ptr, int nb)
+{
+        return udbg_read(ptr, nb);
+}
+
+int
+xmon_read_poll(void)
+{
+        if (udbg_getc_poll)
+                return udbg_getc_poll();
+        return -1;
+}
+ 
+FILE *xmon_stdin;
+FILE *xmon_stdout;
+
+int
+xmon_putc(int c, void *f)
+{
+        char ch = c;
+
+        if (c == '\n')
+                xmon_putc('\r', f);
+        return xmon_write(f, &ch, 1) == 1? c: -1;
+}
+
+int
+xmon_putchar(int c)
+{
+        return xmon_putc(c, xmon_stdout);
+}
+
+int
+xmon_fputs(char *str, void *f)
+{
+        int n = strlen(str);
+
+        return xmon_write(f, str, n) == n? 0: -1;
+}
+
+int
+xmon_readchar(void)
+{
+        char ch;
+
+        for (;;) {
+                switch (xmon_read(xmon_stdin, &ch, 1)) {
+                case 1:
+                        return ch;
+                case -1:
+                        xmon_printf("read(stdin) returned -1\r\n", 0, 0);
+                        return -1;
+                }
+        }
+}
+
+static char line[256];
+static char *lineptr;
+static int lineleft;
+
+int
+xmon_getchar(void)
+{
+        int c;
+
+        if (lineleft == 0) {
+                lineptr = line;
+                for (;;) {
+                        c = xmon_readchar();
+                        if (c == -1 || c == 4)
+                                break;
+                        if (c == '\r' || c == '\n') {
+                                *lineptr++ = '\n';
+                                xmon_putchar('\n');
+                                break;
+                        }
+                        switch (c) {
+                        case 0177:
+                        case '\b':
+                                if (lineptr > line) {
+                                        xmon_putchar('\b');
+                                        xmon_putchar(' ');
+                                        xmon_putchar('\b');
+                                        --lineptr;
+                                }
+                                break;
+                        case 'U' & 0x1F:
+                                while (lineptr > line) {
+                                        xmon_putchar('\b');
+                                        xmon_putchar(' ');
+                                        xmon_putchar('\b');
+                                        --lineptr;
+                                }
+                                break;
+                        default:
+                                if (lineptr >= &line[sizeof(line) - 1])
+                                        xmon_putchar('\a');
+                                else {
+                                        xmon_putchar(c);
+                                        *lineptr++ = c;
+                                }
+                        }
+                }
+                lineleft = lineptr - line;
+                lineptr = line;
+        }
+        if (lineleft == 0)
+                return -1;
+        --lineleft;
+        return *lineptr++;
+}
+
+char *
+xmon_fgets(char *str, int nb, void *f)
+{
+        char *p;
+        int c;
+
+        for (p = str; p < str + nb - 1; ) {
+                c = xmon_getchar();
+                if (c == -1) {
+                        if (p == str)
+                                return NULL;
+                        break;
+                }
+                *p++ = c;
+                if (c == '\n')
+                        break;
+        }
+        *p = 0;
+        return str;
+}