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, 133 insertions, 0 deletions

diff --git a/include/compiler.h b/include/compiler.h
new file mode 100644
index 0000000..e659047
--- /dev/null
+++ b/include/compiler.h
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2008 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 __COMPILER_H
+#define __COMPILER_H
+
+#ifndef __ASSEMBLY__
+
+#if __GNUC__
+#define likely(x)       __builtin_expect(!!(x), 1)
+#define unlikely(x)     __builtin_expect(!!(x), 0)
+#define __USED __attribute__((__used__))
+#define __UNUSED __attribute__((__unused__))
+#define __PACKED __attribute__((packed))
+#define __ALIGNED(x) __attribute__((aligned(x)))
+#define __PRINTFLIKE(__fmt,__varargs) __attribute__((__format__ (__printf__, __fmt, __varargs)))
+#define __SCANFLIKE(__fmt,__varargs) __attribute__((__format__ (__scanf__, __fmt, __varargs)))
+#define __SECTION(x) __attribute((section(x)))
+#define __PURE __attribute((pure))
+#define __CONST __attribute((const))
+#define __NO_RETURN __attribute__((noreturn)) 
+#define __MALLOC __attribute__((malloc))
+#define __WEAK __attribute__((weak))
+#define __GNU_INLINE __attribute__((gnu_inline))
+#define __GET_CALLER(x) __builtin_return_address(0)
+#define __GET_FRAME(x) __builtin_frame_address(0)
+
+#define INCBIN(symname, sizename, filename, section)					\
+	__asm__ (".section " section "; .align 4; .globl "#symname);		\
+	__asm__ (""#symname ":\n.incbin \"" filename "\"");					\
+	__asm__ (".section " section "; .align 1;");						\
+	__asm__ (""#symname "_end:");										\
+	__asm__ (".section " section "; .align 4; .globl "#sizename);		\
+	__asm__ (""#sizename ": .long "#symname "_end - "#symname " - 1");	\
+	extern unsigned char symname[];										\
+	extern unsigned int sizename
+
+#define INCFILE(symname, sizename, filename) INCBIN(symname, sizename, filename, ".rodata")
+
+/* look for gcc 3.0 and above */
+#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 0)
+#define __ALWAYS_INLINE __attribute__((always_inline))
+#else
+#define __ALWAYS_INLINE
+#endif
+
+/* look for gcc 3.1 and above */
+#if !defined(__DEPRECATED) // seems to be built in in some versions of the compiler
+#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
+#define __DEPRECATED __attribute((deprecated))
+#else
+#define __DEPRECATED
+#endif
+#endif
+
+/* look for gcc 3.3 and above */
+#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)
+/* the may_alias attribute was introduced in gcc 3.3; before that, there
+ * was no way to specify aliasiang rules on a type-by-type basis */
+#define __MAY_ALIAS __attribute__((may_alias)) 
+
+/* nonnull was added in gcc 3.3 as well */
+#define __NONNULL(x) __attribute((nonnull x))
+#else
+#define __MAY_ALIAS
+#define __NONNULL(x)
+#endif
+
+/* look for gcc 3.4 and above */
+#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
+#define __WARN_UNUSED_RESULT __attribute((warn_unused_result))
+#else
+#define __WARN_UNUSED_RESULT
+#endif
+
+#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
+#define __EXTERNALLY_VISIBLE __attribute__((externally_visible))
+#else
+#define __EXTERNALLY_VISIBLE
+#endif
+
+#else
+
+#define likely(x)       (x)
+#define unlikely(x)     (x)
+#define __USED
+#define __UNUSED 
+#define __PACKED 
+#define __ALIGNED(x)
+#define __PRINTFLIKE(__fmt,__varargs)
+#define __SCANFLIKE(__fmt,__varargs)
+#define __SECTION(x)
+#define __PURE
+#define __CONST
+#define __NONNULL(x)
+#define __DEPRECATED
+#define __WARN_UNUSED_RESULT
+#define __ALWAYS_INLINE
+#define __MAY_ALIAS
+#define __NO_RETURN
+#endif
+
+#endif
+
+/* TODO: add type check */
+#define countof(a) (sizeof(a) / sizeof((a)[0]))
+
+#define IS_ENABLED(define)		_IS_ENABLED(define)
+#define _comma_if_enabled_1		,
+#define _IS_ENABLED(value)		__IS_ENABLED(_comma_if_enabled_##value)
+#define __IS_ENABLED(comma)		___IS_ENABLED(comma 1, 0)
+#define ___IS_ENABLED(_, enabled, ...)	enabled
+
+#endif