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

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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>
This commit is contained in:
Kristian Høgsberg 2008-05-29 18:31:14 -04:00 committed by H. Peter Anvin
parent c7d624d1ee
commit 23968f71b2
1 changed files with 11 additions and 15 deletions
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26
arch/x86/boot/compressed/misc.c
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@ -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 */