linux-kernel - [PATCH 1/2 v3] Use structs instead of hardcoded offsets in x86 boot decompressor.

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Date:	Thu, 29 May 2008 13:27:11 -0400
From:	Kristian Høgsberg <krh@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Kristian Høgsberg <krh@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 1/2 v3] Use structs instead of hardcoded offsets in x86 boot decompressor.

Just a minor cleanup, making it easier to access the command line in
the following "Honor quiet in decompressor" patch.

Signed-off-by: Kristian Høgsberg <krh@...hat.com>

---

Updated this one to be less intrusive; we just re-#define RM_SCREEN_INFO to
access the boot_params struct instead of using the hard-coded offset.

 arch/x86/boot/compressed/misc.c |   10 +++-------
 1 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 90456ce..102b68e 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -30,6 +30,7 @@
 #include <asm/io.h>
 #include <asm/page.h>
 #include <asm/boot.h>
+#include <asm/bootparam.h>
 
 /* WARNING!!
  * This code is compiled with -fPIC and it is relocated dynamically
@@ -187,13 +188,8 @@ static void gzip_release(void **);
 /*
  * This is set up by the setup-routine at boot-time
  */
-static unsigned char *real_mode; /* Pointer to real-mode data */
-
-#define RM_EXT_MEM_K   (*(unsigned short *)(real_mode + 0x2))
-#ifndef STANDARD_MEMORY_BIOS_CALL
-#define RM_ALT_MEM_K   (*(unsigned long *)(real_mode + 0x1e0))
-#endif
-#define RM_SCREEN_INFO (*(struct screen_info *)(real_mode+0))
+static struct boot_params *real_mode;		/* Pointer to real-mode data */
+#define RM_SCREEN_INFO (real_mode->screen_info)
 
 extern unsigned char input_data[];
 extern int input_len;
-- 
1.5.4.5

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