arch, include, soc: Use common stdint.h

There are only minimal differences between the architecture specific
stdint.h implementations, so let's tidy them up and merge them together
into a single file. In particular,

- Use 'unsigned long' for uintptr_t. This was already the case for x86
  and riscv, while arm and mips used 'unsigned int', and arm64 and ppc64
  used 'unsigned long long'. This change allows using a single integer
  type for uintptr_t across all architectures, and brings it into
  consistency with the rest of the code base, which generally uses
  'unsigned long' for memory addresses anyway. This change required
  fixing several assumptions about integer types in the arm code.
- Use _Bool as the boolean type. This is a specialized boolean type that
  was introduced in C99, and is preferrable over hacking booleans
  using integers. romcc sadly does not support _Bool, so for that we
  stick with the old uint8_t.
- Drop the least and fast integer types. They aren't used
  anywhere in the code base and are an unnecessary maintenance burden.
  Using the standard fixed width types is essentially always better anyway.
- Drop the UINT64_C() macro. It also isn't used anywhere and doesn't
  provide anything that a (uint64_t) cast doesn't.
- Implement the rest of the MIN and MAX numerical limits.
- Use static assertions to check that the integer widths are correct.

Change-Id: I6b52f37793151041b7bdee9ec3708bfad69617b2
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34075
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

1 files changed, 119 insertions, 0 deletions

diff --git a/src/include/stdint.h b/src/include/stdint.h
new file mode 100644
index 0000000000..f363aab08a
--- /dev/null
+++ b/src/include/stdint.h
@@ -0,0 +1,119 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef STDINT_H
+#define STDINT_H
+
+/* romcc does not support long long, _Static_assert, or _Bool, so we must ifdef that code out.
+   Also, GCC can provide its own implementation of stdint.h, so in theory we could use that
+   instead of this custom file once romcc is no more. */
+
+/* Fixed width integer types */
+typedef signed char        int8_t;
+typedef unsigned char      uint8_t;
+
+typedef signed short       int16_t;
+typedef unsigned short     uint16_t;
+
+typedef signed int         int32_t;
+typedef unsigned int       uint32_t;
+
+#ifndef __ROMCC__
+typedef signed long long   int64_t;
+typedef unsigned long long uint64_t;
+#endif
+
+/* Types for 'void *' pointers */
+typedef signed long        intptr_t;
+typedef unsigned long      uintptr_t;
+
+/* Ensure that the widths are all correct */
+#ifndef __ROMCC__
+_Static_assert(sizeof(int8_t) == 1, "Size of int8_t is incorrect");
+_Static_assert(sizeof(uint8_t) == 1, "Size of uint8_t is incorrect");
+
+_Static_assert(sizeof(int16_t) == 2, "Size of int16_t is incorrect");
+_Static_assert(sizeof(uint16_t) == 2, "Size of uint16_t is incorrect");
+
+_Static_assert(sizeof(int32_t) == 4, "Size of int32_t is incorrect");
+_Static_assert(sizeof(uint32_t) == 4, "Size of uint32_t is incorrect");
+
+_Static_assert(sizeof(int64_t) == 8, "Size of int64_t is incorrect");
+_Static_assert(sizeof(uint64_t) == 8, "Size of uint64_t is incorrect");
+
+_Static_assert(sizeof(intptr_t) == sizeof(void *), "Size of intptr_t is incorrect");
+_Static_assert(sizeof(uintptr_t) == sizeof(void *), "Size of uintptr_t is incorrect");
+#endif
+
+/* Maximum width integer types */
+#ifndef __ROMCC__
+typedef int64_t  intmax_t;
+typedef uint64_t uintmax_t;
+#endif
+
+/* Convenient typedefs */
+typedef int8_t   s8;
+typedef uint8_t  u8;
+
+typedef int16_t  s16;
+typedef uint16_t u16;
+
+typedef int32_t  s32;
+typedef uint32_t u32;
+
+#ifndef __ROMCC__
+typedef int64_t  s64;
+typedef uint64_t u64;
+#endif
+
+/* Limits of integer types */
+#define INT8_MIN   ((int8_t)0x80)
+#define INT8_MAX   ((int8_t)0x7F)
+#define UINT8_MAX  ((uint8_t)0xFF)
+
+#define INT16_MIN  ((int16_t)0x8000)
+#define INT16_MAX  ((int16_t)0x7FFF)
+#define UINT16_MAX ((uint16_t)0xFFFF)
+
+#define INT32_MIN  ((int32_t)0x80000000)
+#define INT32_MAX  ((int32_t)0x7FFFFFFF)
+#define UINT32_MAX ((uint32_t)0xFFFFFFFF)
+
+#ifndef __ROMCC__
+#define INT64_MIN  ((int64_t)0x8000000000000000)
+#define INT64_MAX  ((int64_t)0x7FFFFFFFFFFFFFFF)
+#define UINT64_MAX ((uint64_t)0xFFFFFFFFFFFFFFFF)
+#endif
+
+#ifndef __ROMCC__
+#define INTMAX_MIN  INT64_MIN
+#define INTMAX_MAX  INT64_MAX
+#define UINTMAX_MAX UINT64_MAX
+#endif
+
+/* TODO: move into stdbool.h */
+#ifdef __ROMCC__
+typedef uint8_t bool;
+#else
+typedef _Bool   bool;
+#endif
+#define true    1
+#define false   0
+
+/* TODO: move into inttypes.h */
+#ifndef __ROMCC__
+#define PRIu64  "llu"
+#define PRIxPTR "lx"
+#endif
+
+#endif /* STDINT_H */