New patch to review for coreboot: 45a346f inteltool: Cast to `ptrdiff_t` instead of `uint64_t`

[Paul Menzel]

Paul Menzel ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/3002

-gerrit

commit 45a346f15b5ee549698fc6aa274c9f3ef91fd445
Author: Paul Menzel 
Date:   Mon Apr 1 18:26:58 2013 +0200

inteltool: Cast to `ptrdiff_t` instead of `uint64_t`

When building inteltool under x86-32, the following warnings are
    shown.

$ gcc --version
        gcc-4.7.real (Debian 4.7.2-15) 4.7.2
        Copyright (C) 2012 Free Software Foundation, Inc.
        This is free software; see the source for copying conditions.  There is NO
        warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
        $ make
        […]
        amb.c: In function ‘amb_read_config32’:
        amb.c:31:23: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
        amb.c:31:10: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
        amb.c: In function ‘amb_read_config16’:
        amb.c:45:23: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
        amb.c:45:10: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
        amb.c: In function ‘amb_read_config8’:
        amb.c:60:22: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
        amb.c:60:10: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
        […]

Nico Huber commented the following [1].

I don't see those warnings because I build for x86-64. I guess
        they could be fixed by casting to `ptrdiff_t` (from stddef.h)
        instead of `uint64_t`.

And indeed, using `ptrdiff_t` fixes the warning.

These warnings were introduced in commit »inteltool: Add support for
    dumping AMB registers« (4b7b320f) [2].

[1] http://review.coreboot.org/#/c/2996/1//COMMIT_MSG
    [2] http://review.coreboot.org/525

Change-Id: I2ea1a31dc1e3db129e767d6a9e0433fd75a77d0f
    Signed-off-by: Paul Menzel 
---
 util/inteltool/amb.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/util/inteltool/amb.c b/util/inteltool/amb.c
index a3ee01d..9ff2977 100644
--- a/util/inteltool/amb.c
+++ b/util/inteltool/amb.c
@@ -17,7 +17,7 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

-
+#include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include "inteltool.h"
@@ -28,7 +28,7 @@

static uint32_t amb_read_config32(volatile void *base, int fn, int reg)
 {
-	return *(uint32_t *)(AMB_ADDR((uint64_t)base, fn, reg));
+	return *(uint32_t *)(AMB_ADDR((ptrdiff_t)base, fn, reg));
 }

static void amb_printreg32(volatile void *base, int fn, int reg,
@@ -42,7 +42,7 @@ static void amb_printreg32(volatile void *base, int fn, int reg,

static uint16_t amb_read_config16(volatile void *base, int fn, int reg)
 {
-	return *(uint16_t *)(AMB_ADDR((uint64_t)base, fn, reg));
+	return *(uint16_t *)(AMB_ADDR((ptrdiff_t)base, fn, reg));
 }

static void amb_printreg16(volatile void *base, int fn, int reg,
@@ -57,7 +57,7 @@ static void amb_printreg16(volatile void *base, int fn, int reg,

static uint8_t amb_read_config8(volatile void *base, int fn, int reg)
 {
-	return *(uint8_t *)(AMB_ADDR((uint64_t)base, fn, reg));
+	return *(uint8_t *)(AMB_ADDR((ptrdiff_t)base, fn, reg));
 }

static void amb_printreg8(volatile void *base, int fn, int reg,