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, 121 insertions, 0 deletions

diff --git a/include/limits.h b/include/limits.h
new file mode 100644
index 0000000..ec83068
--- /dev/null
+++ b/include/limits.h
@@ -0,0 +1,121 @@
+/* This administrivia gets added to the beginning of limits.h
+   if the system has its own version of limits.h.  */
+
+/* We use _GCC_LIMITS_H_ because we want this not to match
+   any macros that the system's limits.h uses for its own purposes.  */
+#ifndef _GCC_LIMITS_H_  /* Terminated in limity.h.  */
+#define _GCC_LIMITS_H_
+
+#ifndef _LIMITS_H___
+#define _LIMITS_H___
+
+/* Number of bits in a `char'.  */
+#undef CHAR_BIT
+#define CHAR_BIT __CHAR_BIT__
+
+/* Maximum length of a multibyte character.  */
+#ifndef MB_LEN_MAX
+#define MB_LEN_MAX 1
+#endif
+
+/* Minimum and maximum values a `signed char' can hold.  */
+#undef SCHAR_MIN
+#define SCHAR_MIN (-SCHAR_MAX - 1)
+#undef SCHAR_MAX
+#define SCHAR_MAX __SCHAR_MAX__
+
+/* Maximum value an `unsigned char' can hold.  (Minimum is 0).  */
+#undef UCHAR_MAX
+#if __SCHAR_MAX__ == __INT_MAX__
+# define UCHAR_MAX (SCHAR_MAX * 2U + 1U)
+#else
+# define UCHAR_MAX (SCHAR_MAX * 2 + 1)
+#endif
+
+/* Minimum and maximum values a `char' can hold.  */
+#ifdef __CHAR_UNSIGNED__
+# undef CHAR_MIN
+# if __SCHAR_MAX__ == __INT_MAX__
+#  define CHAR_MIN 0U
+# else
+#  define CHAR_MIN 0
+# endif
+# undef CHAR_MAX
+# define CHAR_MAX UCHAR_MAX
+#else
+# undef CHAR_MIN
+# define CHAR_MIN SCHAR_MIN
+# undef CHAR_MAX
+# define CHAR_MAX SCHAR_MAX
+#endif
+
+/* Minimum and maximum values a `signed short int' can hold.  */
+#undef SHRT_MIN
+#define SHRT_MIN (-SHRT_MAX - 1)
+#undef SHRT_MAX
+#define SHRT_MAX __SHRT_MAX__
+
+/* Maximum value an `unsigned short int' can hold.  (Minimum is 0).  */
+#undef USHRT_MAX
+#if __SHRT_MAX__ == __INT_MAX__
+# define USHRT_MAX (SHRT_MAX * 2U + 1U)
+#else
+# define USHRT_MAX (SHRT_MAX * 2 + 1)
+#endif
+
+/* Minimum and maximum values a `signed int' can hold.  */
+#undef INT_MIN
+#define INT_MIN (-INT_MAX - 1)
+#undef INT_MAX
+#define INT_MAX __INT_MAX__
+
+/* Maximum value an `unsigned int' can hold.  (Minimum is 0).  */
+#undef UINT_MAX
+#define UINT_MAX (INT_MAX * 2U + 1U)
+
+/* Minimum and maximum values a `signed long int' can hold.
+   (Same as `int').  */
+#undef LONG_MIN
+#define LONG_MIN (-LONG_MAX - 1L)
+#undef LONG_MAX
+#define LONG_MAX __LONG_MAX__
+
+/* Maximum value an `unsigned long int' can hold.  (Minimum is 0).  */
+#undef ULONG_MAX
+#define ULONG_MAX (LONG_MAX * 2UL + 1UL)
+
+#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+/* Minimum and maximum values a `signed long long int' can hold.  */
+# undef LLONG_MIN
+# define LLONG_MIN (-LLONG_MAX - 1LL)
+# undef LLONG_MAX
+# define LLONG_MAX __LONG_LONG_MAX__
+
+/* Maximum value an `unsigned long long int' can hold.  (Minimum is 0).  */
+# undef ULLONG_MAX
+# define ULLONG_MAX (LLONG_MAX * 2ULL + 1ULL)
+#endif
+
+#if defined (__GNU_LIBRARY__) ? defined (__USE_GNU) : !defined (__STRICT_ANSI__)
+/* Minimum and maximum values a `signed long long int' can hold.  */
+# undef LONG_LONG_MIN
+# define LONG_LONG_MIN (-LONG_LONG_MAX - 1LL)
+# undef LONG_LONG_MAX
+# define LONG_LONG_MAX __LONG_LONG_MAX__
+
+/* Maximum value an `unsigned long long int' can hold.  (Minimum is 0).  */
+# undef ULONG_LONG_MAX
+# define ULONG_LONG_MAX (LONG_LONG_MAX * 2ULL + 1ULL)
+#endif
+
+#endif /* _LIMITS_H___ */
+/* This administrivia gets added to the end of limits.h
+   if the system has its own version of limits.h.  */
+
+#else /* not _GCC_LIMITS_H_ */
+
+#ifdef _GCC_NEXT_LIMITS_H
+#include_next <limits.h>		/* recurse down to the real one */
+#endif
+
+#endif /* not _GCC_LIMITS_H_ */