1 files changed, 172 insertions, 0 deletions
diff --git a/arch/ppc/boot/openfirmware/start.c b/arch/ppc/boot/openfirmware/start.c
new file mode 100644
index 00000000000..1617a26956b
--- /dev/null
+++ b/arch/ppc/boot/openfirmware/start.c
@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) Paul Mackerras 1997.
+ *
+ * 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 "of1275.h"
+
+extern int strlen(const char *s);
+extern void boot(int a1, int a2, void *prom);
+
+phandle stdin;
+phandle stdout;
+phandle stderr;
+
+void printk(char *fmt, ...);
+
+void
+start(int a1, int a2, void *promptr)
+{
+    ofinit(promptr);
+    if (ofstdio(&stdin, &stdout, &stderr))
+	exit();
+
+    boot(a1, a2, promptr);
+    for (;;)
+	exit();
+}
+
+int writestring(void *f, char *ptr, int nb)
+{
+	int w = 0, i;
+	char *ret = "\r";
+
+	for (i = 0; i < nb; ++i) {
+		if (ptr[i] == '\n') {
+			if (i > w) {
+				write(f, ptr + w, i - w);
+				w = i;
+			}
+			write(f, ret, 1);
+		}
+	}
+	if (w < nb)
+		write(f, ptr + w, nb - w);
+	return nb;
+}
+
+int
+putc(int c, void *f)
+{
+    char ch = c;
+
+    return writestring(f, &ch, 1) == 1? c: -1;
+}
+
+int
+putchar(int c)
+{
+    return putc(c, stdout);
+}
+
+int
+fputs(char *str, void *f)
+{
+    int n = strlen(str);
+
+    return writestring(f, str, n) == n? 0: -1;
+}
+
+int
+readchar(void)
+{
+    char ch;
+
+    for (;;) {
+	switch (read(stdin, &ch, 1)) {
+	case 1:
+	    return ch;
+	case -1:
+	    printk("read(stdin) returned -1\n");
+	    return -1;
+	}
+    }
+}
+
+static char line[256];
+static char *lineptr;
+static int lineleft;
+
+int
+getchar(void)
+{
+    int c;
+
+    if (lineleft == 0) {
+	lineptr = line;
+	for (;;) {
+	    c = readchar();
+	    if (c == -1 || c == 4)
+		break;
+	    if (c == '\r' || c == '\n') {
+		*lineptr++ = '\n';
+		putchar('\n');
+		break;
+	    }
+	    switch (c) {
+	    case 0177:
+	    case '\b':
+		if (lineptr > line) {
+		    putchar('\b');
+		    putchar(' ');
+		    putchar('\b');
+		    --lineptr;
+		}
+		break;
+	    case 'U' & 0x1F:
+		while (lineptr > line) {
+		    putchar('\b');
+		    putchar(' ');
+		    putchar('\b');
+		    --lineptr;
+		}
+		break;
+	    default:
+		if (lineptr >= &line[sizeof(line) - 1])
+		    putchar('\a');
+		else {
+		    putchar(c);
+		    *lineptr++ = c;
+		}
+	    }
+	}
+	lineleft = lineptr - line;
+	lineptr = line;
+    }
+    if (lineleft == 0)
+	return -1;
+    --lineleft;
+    return *lineptr++;
+}
+
+extern int vsprintf(char *buf, const char *fmt, va_list args);
+static char sprint_buf[1024];
+
+void
+printk(char *fmt, ...)
+{
+	va_list args;
+	int n;
+
+	va_start(args, fmt);
+	n = vsprintf(sprint_buf, fmt, args);
+	va_end(args);
+	writestring(stdout, sprint_buf, n);
+}
+
+int
+printf(char *fmt, ...)
+{
+	va_list args;
+	int n;
+
+	va_start(args, fmt);
+	n = vsprintf(sprint_buf, fmt, args);
+	va_end(args);
+	writestring(stdout, sprint_buf, n);
+	return n;
+}