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fix some bugs in the linux boot code.

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This commit is contained in:
okuji 2000-07-25 12:08:14 +00:00
parent c786d8603e
commit 529a2dc5e0
5 changed files with 33 additions and 9 deletions
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18
ChangeLog
View file

@ -1,3 +1,21 @@
2000-07-25 OKUJI Yoshinori <okuji@gnu.org>
* stage2/asm.S [!STAGE1_5] (linux_text_len): New variable.
[!STAGE1_5] (linux_boot): Don't set %eax to LINUX_SETUP
meaninglessly.
Set %ecx to LINUX_TEXT_LEN instead of LINUX_KERNEL_MAXLEN.
[!STAGE1_5] (big_linux_boot): Disable interrupts before changing
the stack pointer.
Change %ss right before %sp.
Reverse the arguments for ljmp. A segment must be after an
offset. *sigh*
* stage2/boot.c (load_image): Set LINUX_TEXT_LEN to TEXT_LEN,
if a Linux kernel is loaded successfully.
* stage2/shared.h (LINUX_VID_MODE_OFFSET): Removed.
[!ASM_FILE] (linux_kernel_header): Change the type of the member
`heap_end_ptr' to unsigned short.
[!ASM_FILE] (linux_text_len): Declared.
2000-07-24 OKUJI Yoshinori <okuji@gnu.org>
Comply with the Linux/i386 boot protocol version 2.02.

1
grub/asmstub.c
View file

@ -66,6 +66,7 @@ unsigned long install_partition = 0x20000;
unsigned long boot_drive = 0;
char version_string[] = VERSION;
char config_file[128] = "/boot/grub/menu.lst"; /* FIXME: arbitrary */
unsigned long linux_text_len = 0;
/* Emulation requirements. */
char *grub_scratch_mem = 0;

14
stage2/asm.S
View file

@ -1689,14 +1689,15 @@ ENTRY(patch_code_end)
* entry point of the Linux setup code.
*/
VARIABLE(linux_text_len)
.long 0
ENTRY(linux_boot)
/* don't worry about saving anything, we're committed at this point */
cld /* forward copying */
/* copy kernel */
movl $LINUX_SETUP, %eax
/* XXX: Too many bytes, but there is no bad effect */
movl $LINUX_KERNEL_MAXLEN, %ecx
movl EXT_C(linux_text_len), %ecx
shll $2, %ecx
movl $LINUX_STAGING_AREA, %esi
movl $LINUX_KERNEL, %edi
@ -1715,10 +1716,11 @@ ENTRY(big_linux_boot)
.code16
/* final setup for linux boot */
movw $LINUX_SETUP_STACK, %sp
cli
movw $LINUX_INIT_SEG, %ax
movw %ax, %ss
movw $LINUX_SETUP_STACK, %sp
movw %ax, %ds
movw %ax, %es
movw %ax, %fs
@ -1727,8 +1729,8 @@ ENTRY(big_linux_boot)
/* jump to start */
/* ljmp */
.byte 0xea
.word LINUX_SETUP_SEG
.word 0
.word LINUX_SETUP_SEG
.code32

5
stage2/boot.c
View file

@ -347,10 +347,13 @@ load_image (char *kernel, char *arg, kernel_t suggested_type,
errnum = ERR_EXEC_FORMAT;
return KERNEL_TYPE_NONE;
}
/* Ugly hack. */
linux_text_len = text_len;
return big_linux ? KERNEL_TYPE_BIG_LINUX : KERNEL_TYPE_LINUX;
}
else if (!errnum)
else if (! errnum)
errnum = ERR_EXEC_FORMAT;
}
else

4
stage2/shared.h
View file

@ -154,7 +154,6 @@ extern char *grub_scratch_mem;
#define LINUX_FLAG_BIG_KERNEL 0x1
/* Linux's video mode selection support. Actually I hate it! */
#define LINUX_VID_MODE_OFFSET 0x1FA
#define LINUX_VID_MODE_NORMAL 0xFFFF
#define LINUX_VID_MODE_EXTENDED 0xFFFE
#define LINUX_VID_MODE_ASK 0xFFFD
@ -396,7 +395,7 @@ struct linux_kernel_header
unsigned long ramdisk_image; /* initrd load address */
unsigned long ramdisk_size; /* initrd size */
unsigned long bootsect_kludge; /* obsolete */
unsigned long heap_end_ptr; /* Free memory after setup end */
unsigned short heap_end_ptr; /* Free memory after setup end */
unsigned short pad1; /* Unused */
unsigned long cmd_line_ptr; /* Points to the kernel command line */
} __attribute__ ((packed));
@ -460,6 +459,7 @@ extern unsigned long boot_part_offset;
extern unsigned char force_lba;
extern char version_string[];
extern char config_file[];
extern unsigned long linux_text_len;
#ifdef GRUB_UTIL
/* If not using config file, this variable is set to zero,