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SubjectRe: [PATCH 2.5.12] x86 Boot enhancements, constants 4/11
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Date
Please apply,

This patch introduces several constants to the x86 boot process.

Eric

diff -uNr linux-2.5.12.boot.spring-cleaning/arch/i386/boot/setup.S linux-2.5.12.boot.syntax/arch/i386/boot/setup.S
--- linux-2.5.12.boot.spring-cleaning/arch/i386/boot/setup.S Wed May 1 09:38:54 2002
+++ linux-2.5.12.boot.syntax/arch/i386/boot/setup.S Wed May 1 09:39:11 2002
@@ -59,6 +59,12 @@
#define SIG1 0xAA55
#define SIG2 0x5A5A

+#ifndef __BIG_KERNEL__
+#define KERNEL_START LOW_BASE /* zImage */
+#else
+#define KERNEL_START HIGH_BASE /* bzImage */
+#endif
+
INITSEG = DEF_INITSEG # 0x9000, we move boot here, out of the way
SYSSEG = DEF_SYSSEG # 0x1000, system loaded at 0x10000 (65536).
SETUPSEG = DEF_SETUPSEG # 0x9020, this is the current segment
@@ -118,13 +124,8 @@
# loader knows how much data behind
# us also needs to be loaded.

-code32_start: # here loaders can put a different
+code32_start: .long KERNEL_START # here loaders can put a different
# start address for 32-bit code.
-#ifndef __BIG_KERNEL__
- .long 0x1000 # 0x1000 = default for zImage
-#else
- .long 0x100000 # 0x100000 = default for big kernel
-#endif

ramdisk_image: .long 0 # address of loaded ramdisk image
# Here the loader puts the 32-bit
@@ -343,7 +344,7 @@

incb (E820NR)
movw %di, %ax
- addw $20, %ax
+ addw $E820ENTRY_SIZE, %ax
movw %ax, %di
again820:
cmpl $0, %ebx # check to see if
diff -uNr linux-2.5.12.boot.spring-cleaning/include/asm-i386/boot.h linux-2.5.12.boot.syntax/include/asm-i386/boot.h
--- linux-2.5.12.boot.spring-cleaning/include/asm-i386/boot.h Wed Apr 16 15:15:00 1997
+++ linux-2.5.12.boot.syntax/include/asm-i386/boot.h Wed May 1 09:39:11 2002
@@ -1,6 +1,19 @@
#ifndef _LINUX_BOOT_H
#define _LINUX_BOOT_H

+/* Address space division during load */
+ /* Memory below 640 we can use for loading */
+#define LOW_BASE 0x001000
+#define LOW_MAX 0x0a0000 /* Maximum low memory address to use */
+ /* Memory above 640 we can use for loading */
+#define HIGH_BASE 0x100000
+#define HIGH_MAX __MAXMEM
+ /* Subset of the low segment that is generally safe to
+ * use for loading.
+ */
+#define REAL_BASE 0x010000
+#define REAL_MAX 0x090000
+
/* Don't touch these, unless you really know what you're doing. */
#define DEF_INITSEG 0x9000
#define DEF_SYSSEG 0x1000
diff -uNr linux-2.5.12.boot.spring-cleaning/include/asm-i386/e820.h linux-2.5.12.boot.syntax/include/asm-i386/e820.h
--- linux-2.5.12.boot.spring-cleaning/include/asm-i386/e820.h Fri Aug 18 10:30:51 2000
+++ linux-2.5.12.boot.syntax/include/asm-i386/e820.h Wed May 1 09:39:11 2002
@@ -15,6 +15,7 @@
#define E820MAP 0x2d0 /* our map */
#define E820MAX 32 /* number of entries in E820MAP */
#define E820NR 0x1e8 /* # entries in E820MAP */
+#define E820ENTRY_SIZE 20 /* size of an E820MAP entry */

#define E820_RAM 1
#define E820_RESERVED 2
-
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