tashaboot: arm64 bringup, semihosting payload loader

consoles on the pl011 the dtb points at, walks the memory node and
chosen, loads an arm64 kernel Image over semihosting and jumps to it
with the documented register state. string functions, printf and
libfdt are vendored from lk (lk2nd) and u-boot so the libc surface is
the one those projects already proved. built and booted on qemu virt,
payload exits clean through semihosting.

1 files changed, 51 insertions, 0 deletions

diff --git a/include/stdio.h b/include/stdio.h
new file mode 100644
index 0000000..93e2844
--- /dev/null
+++ b/include/stdio.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2008-2013 Travis Geiselbrecht
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef __STDIO_H
+#define __STDIO_H
+
+#include <debug.h>
+#include <printf.h>
+
+/* fake FILE struct */
+typedef struct FILE {
+} FILE;
+
+#define stdin ((FILE *)1)
+#define stdout ((FILE *)2)
+#define stderr ((FILE *)3)
+
+int fputc(int c, FILE *fp);
+#define putc(c, fp) fputc(c, fp)
+int putchar(int c);
+
+int fputs(const char *s, FILE *fp);
+int puts(const char *str);
+
+int getc(FILE *fp);
+int getchar(void);
+
+size_t fwrite(const void *buf, size_t size, size_t count, FILE *stream);
+int sscanf(const char *str, const char *format, ...);
+
+#endif
+