x86: Use structs instead of hardcoded offsets in x86 boot decompressor.

Replace hardcoded offsets embedded in macros in
arch/x86/boot/compressed with proper structure references.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 90456cee47c337b226a8874582440377c428a91e..74ed3c075ee60ebdef14c95e6021005cec0fa4ae 100644 (file)
--- 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 +188,7 @@ 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 */
 
 extern unsigned char input_data[];
 extern int input_len;
@@ -276,12 +271,13 @@ static void putstr(const char *s)
        char c;
 
 #ifdef CONFIG_X86_32
-       if (RM_SCREEN_INFO.orig_video_mode == 0 && lines == 0 && cols == 0)
+       if (real_mode->screen_info.orig_video_mode == 0 &&
+           lines == 0 && cols == 0)
                return;
 #endif
 
-       x = RM_SCREEN_INFO.orig_x;
-       y = RM_SCREEN_INFO.orig_y;
+       x = real_mode->screen_info.orig_x;
+       y = real_mode->screen_info.orig_y;
 
        while ((c = *s++) != '\0') {
                if (c == '\n') {
@@ -302,8 +298,8 @@ static void putstr(const char *s)
                }
        }
 
-       RM_SCREEN_INFO.orig_x = x;
-       RM_SCREEN_INFO.orig_y = y;
+       real_mode->screen_info.orig_x = x;
+       real_mode->screen_info.orig_y = y;
 
        pos = (x + cols * y) * 2;       /* Update cursor position */
        outb(14, vidport);
@@ -430,7 +426,7 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
 {
        real_mode = rmode;
 
-       if (RM_SCREEN_INFO.orig_video_mode == 7) {
+       if (real_mode->screen_info.orig_video_mode == 7) {
                vidmem = (char *) 0xb0000;
                vidport = 0x3b4;
        } else {
@@ -438,8 +434,8 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
                vidport = 0x3d4;
        }
 
-       lines = RM_SCREEN_INFO.orig_video_lines;
-       cols = RM_SCREEN_INFO.orig_video_cols;
+       lines = real_mode->screen_info.orig_video_lines;
+       cols = real_mode->screen_info.orig_video_cols;
 
        window = output;                /* Output buffer (Normally at 1M) */
        free_mem_ptr     = heap;        /* Heap */