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.lilo and derived targets (e.g. .iso) now load properly.

This commit is contained in:
Michael Brown 2007-01-14 11:50:44 +00:00
parent 77d280968a
commit b04b0ddc31
1 changed files with 27 additions and 21 deletions
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48
src/arch/i386/prefix/liloprefix.S
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@ -50,16 +50,14 @@
.arch i386 .arch i386
.org 0 .org 0
.section ".prefix", "ax", @progbits .section ".prefix", "ax", @progbits
_prefix:
/* /*
This is a minimal boot sector. If anyone tries to execute it (e.g., if This is a minimal boot sector. If anyone tries to execute it (e.g., if
a .lilo file is dd'ed to a floppy), print an error message. a .lilo file is dd'ed to a floppy), print an error message.
*/ */
bootsector: bootsector:
jmp $BOOTSEG, $go - _prefix /* reload cs:ip to match relocation addr */ jmp $BOOTSEG, $1f /* reload cs:ip to match relocation addr */
go: 1:
movw $0x2000, %di /* 0x2000 is arbitrary value >= length movw $0x2000, %di /* 0x2000 is arbitrary value >= length
of bootsect + room for stack */ of bootsect + room for stack */
@ -73,7 +71,7 @@ go:
sti sti
movw $why_end-why, %cx movw $why_end-why, %cx
movw $why - _prefix, %si movw $why, %si
movw $0x0007, %bx /* page 0, attribute 7 (normal) */ movw $0x0007, %bx /* page 0, attribute 7 (normal) */
movb $0x0e, %ah /* write char, tty mode */ movb $0x0e, %ah /* write char, tty mode */
@ -93,7 +91,7 @@ setup_sects:
root_flags: root_flags:
.word 0 .word 0
syssize: syssize:
.word _verbatim_size_pgh - PREFIXPGH .word _load_size_pgh - PREFIXPGH
swap_dev: swap_dev:
.word 0 .word 0
ram_size: ram_size:
@ -105,6 +103,8 @@ root_dev:
boot_flag: boot_flag:
.word 0xAA55 .word 0xAA55
.org 512
/* /*
We're now at the beginning of the second sector of the image - We're now at the beginning of the second sector of the image -
where the setup code goes. where the setup code goes.
@ -115,27 +115,33 @@ boot_flag:
executing the Etherboot image that's loaded at SYSSEG:0 and executing the Etherboot image that's loaded at SYSSEG:0 and
whose entry point is SYSSEG:0. whose entry point is SYSSEG:0.
*/ */
setup_code: setup_code:
pushl $0 /* No parameters to preserve for exit path */
pushw $0 /* Use prefix exit path mechanism */
/* Etherboot expects to be contiguous in memory once loaded. /* Etherboot expects to be contiguous in memory once loaded.
* LILO doesn't do this, but since we don't need any * LILO doesn't do this, but since we don't need any
* information that's left in the prefix, it doesn't matter: * information that's left in the prefix, it doesn't matter:
* we just have to ensure that %cs:0000 is where the start of * we just have to ensure that %cs:0000 is where the start of
* the Etherboot image *would* be. * the Etherboot image *would* be.
*/ */
ljmp $(SYSSEG-(PREFIXSIZE/16)), $_start ljmp $(SYSSEG-(PREFIXSIZE/16)), $run_etherboot
.section ".text16", "ax", @progbits
prefix_exit: .org PREFIXSIZE
int $0x19 /* should try to boot machine */
prefix_exit_end:
.previous
.org (PREFIXSIZE-1)
.byte 0
prefix_end:
/* /*
That's about it. We're now at the beginning of the kernel proper.
*/ */
run_etherboot:
call install
/* Jump to .text16 segment */
pushw %ax
pushw $1f
lret
.section ".text16", "awx", @progbits
1:
pushl $main
pushw %cs
call prot_call
popl %eax /* discard */
/* Boot next device */
int $0x18