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Added a global variable gBootDriveID where %dl is stored to.

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Moved the data section closer to the end of the 1024 bytes of the boot
block - the region before is reused as scratch buffer in the real mode
data segment.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7245 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
2004-04-19 22:36:13 +00:00
parent c2cb9079b5
commit 6ed14d8c59
1 changed files with 13 additions and 0 deletions
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src/kernel/boot/platform/bios_ia32/shell.S
+13
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@@ -61,6 +61,7 @@ bfs_start:
movl %cr0, %eax // set the PE bit of cr0 to switch to protected mode movl %cr0, %eax // set the PE bit of cr0 to switch to protected mode
orb $0x1, %al orb $0x1, %al
movl %eax, %cr0 movl %eax, %cr0
.code32 .code32
.byte 0x66 .byte 0x66
ljmp $0x8, $_protected_code_segment ljmp $0x8, $_protected_code_segment
@@ -75,6 +76,9 @@ _protected_code_segment:
mov $0x10000, %ebp // setup new stack mov $0x10000, %ebp // setup new stack
mov %ebp, %esp mov %ebp, %esp
movw %dx, gBootDriveID
// save boot device
call _start call _start
//-------------------------------------------------------------- //--------------------------------------------------------------
@@ -113,6 +117,11 @@ _a20_done:
//-------------------------------------------------------------- //--------------------------------------------------------------
.org 896
// since we don't need the above space when the boot loader is
// running, it is used as a real mode scratch buffer (as our
// boot loader spans over the whole real mode 0x1000 segment)
/* global data table */ /* global data table */
gdt: gdt:
@@ -141,4 +150,8 @@ gdt_descriptor:
.word 0x2f // 6 entries in the GDT (8 bytes each) .word 0x2f // 6 entries in the GDT (8 bytes each)
.long gdt .long gdt
.globl gBootDriveID
gBootDriveID:
.word 0
.org 1024 .org 1024