PXE stage 1 bootloader for Haiku
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18884 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Marcus Overhagen
parent
0f15994178
commit
b8759025a9
277
src/system/boot/platform/pxe_ia32/pxe_stage1.S
Normal file
277
src/system/boot/platform/pxe_ia32/pxe_stage1.S
Normal file
@ -0,0 +1,277 @@
|
||||
/*
|
||||
** Copyright 2006, Marcus Overhagen. All rights reserved.
|
||||
** Distributed under the terms of the MIT License.
|
||||
*/
|
||||
|
||||
// as -o pxe_stage1.o pxe_stage1.S
|
||||
// ld --oformat binary --Ttext 0x7C00 -o pxe_stage1.bin pxe_stage1.o
|
||||
// cp pxe_stage1.bin /tftpboot/pxehaiku
|
||||
// objdump -mi8086 -d pxe_stage1.o
|
||||
// objdump -mi8086 -bbinary -D -z pxe_stage1.bin
|
||||
|
||||
// system state according to PXE specification:
|
||||
// CS:IP 0000:7C00
|
||||
// ES:BX address of the PXENV+ structure
|
||||
// SS:[SP+4] address of the !PXE structure.
|
||||
// SS:SP at least 1.5KB of free stack
|
||||
|
||||
|
||||
.equ PXENV_GET_CACHED_INFO, 0x71
|
||||
.equ PXENV_TFTP_OPEN, 0x20
|
||||
.equ PXENV_TFTP_CLOSE, 0x21
|
||||
.equ PXENV_TFTP_READ, 0x22
|
||||
.equ PXENV_TFTP_GET_FSIZE, 0x25
|
||||
|
||||
.equ PXENV_PACKET_TYPE_DHCP_DISCOVER, 1
|
||||
.equ PXENV_PACKET_TYPE_DHCP_ACK, 2
|
||||
.equ PXENV_PACKET_TYPE_CACHED_REPLY, 3
|
||||
|
||||
.equ BOOTP_OPCODE_REQ, 1
|
||||
.equ BOOTP_OPCODE_REP, 2
|
||||
|
||||
|
||||
.code16
|
||||
.text
|
||||
.globl _start
|
||||
|
||||
_start:
|
||||
// save es segment to dx
|
||||
movw %es, %dx
|
||||
|
||||
// setup segments
|
||||
xorw %ax, %ax
|
||||
movw %ax, %ds
|
||||
movw %ax, %es
|
||||
movw %ax, %ss
|
||||
movw $0x7c00, %sp
|
||||
|
||||
// print start banner
|
||||
movw $startmsg, %si
|
||||
call puts
|
||||
|
||||
// print PXE struct address
|
||||
movw $pxenvmsg, %si
|
||||
call puts
|
||||
movw %dx, %ax
|
||||
call puthex16
|
||||
movw $colon, %si
|
||||
call puts
|
||||
movw %bx, %ax
|
||||
call puthex16
|
||||
movw $crlf, %si
|
||||
call puts
|
||||
|
||||
// switch to unreal mode
|
||||
cli
|
||||
call enable_a20
|
||||
call go_unreal
|
||||
sti
|
||||
movw $unrealmsg, %si
|
||||
call puts
|
||||
|
||||
// store PXE struct address as linear 32 bit pointer in edx
|
||||
andl $0xffff, %edx
|
||||
shll $4, %edx
|
||||
andl $0xffff, %ebx
|
||||
addl %ebx, %edx
|
||||
|
||||
// API version
|
||||
movw $apivermsg, %si
|
||||
call puts
|
||||
movw 0x6(%edx), %ax
|
||||
call puthex16
|
||||
movw $crlf, %si
|
||||
call puts
|
||||
|
||||
// store API entry as seg:ofs in pxenv_api
|
||||
movl 0xa(%edx), %eax
|
||||
movl %eax, pxenv_api
|
||||
|
||||
// print API entry address
|
||||
movw $apimsg, %si
|
||||
call puts
|
||||
movl pxenv_api, %eax
|
||||
shrl $16, %eax
|
||||
call puthex16
|
||||
movw $colon, %si
|
||||
call puts
|
||||
movl pxenv_api, %eax
|
||||
call puthex16
|
||||
movw $crlf, %si
|
||||
call puts
|
||||
|
||||
movw $PXENV_PACKET_TYPE_CACHED_REPLY, %ax
|
||||
// movw $PXENV_PACKET_TYPE_DHCP_ACK, %ax
|
||||
movw %ax, s_PXENV_GET_CACHED_INFO_PacketType
|
||||
movw $300, %ax
|
||||
movw %ax, s_PXENV_GET_CACHED_INFO_BufferSize
|
||||
movl $cached_info, %eax
|
||||
movl %eax, s_PXENV_GET_CACHED_INFO_Buffer
|
||||
|
||||
movw $PXENV_GET_CACHED_INFO, %bx
|
||||
movw $s_PXENV_GET_CACHED_INFO, %di
|
||||
lcall * pxenv_api
|
||||
test %ax, %ax
|
||||
|
||||
andl $0xffff, %eax
|
||||
call puthex32
|
||||
movw $crlf, %si
|
||||
call puts
|
||||
|
||||
movw s_PXENV_GET_CACHED_INFO_Status, %ax
|
||||
andl $0xffff, %eax
|
||||
call puthex32
|
||||
movw $crlf, %si
|
||||
call puts
|
||||
|
||||
movl cached_info_cip, %eax
|
||||
call puthex32
|
||||
movw $crlf, %si
|
||||
call puts
|
||||
|
||||
movl cached_info_yip, %eax
|
||||
call puthex32
|
||||
movw $crlf, %si
|
||||
call puts
|
||||
|
||||
movl cached_info_sip, %eax
|
||||
call puthex32
|
||||
movw $crlf, %si
|
||||
call puts
|
||||
|
||||
movl cached_info_gip, %eax
|
||||
call puthex32
|
||||
movw $crlf, %si
|
||||
call puts
|
||||
|
||||
|
||||
loop:
|
||||
jmp loop
|
||||
|
||||
|
||||
puts: pushal
|
||||
_puts2: lodsb
|
||||
testb %al, %al
|
||||
jnz putc
|
||||
popal
|
||||
ret
|
||||
putc: movw $0x7, %bx
|
||||
movb $0xe, %ah
|
||||
int $0x10
|
||||
jmp _puts2
|
||||
|
||||
puthex32:
|
||||
pushl %eax
|
||||
shrl $16, %eax
|
||||
call puthex16
|
||||
popl %eax
|
||||
call puthex16
|
||||
ret
|
||||
|
||||
puthex16: pushal
|
||||
movw %ax, %cx
|
||||
rolw $4, %cx
|
||||
call puthexc
|
||||
rolw $4, %cx
|
||||
call puthexc
|
||||
rolw $4, %cx
|
||||
call puthexc
|
||||
rolw $4, %cx
|
||||
call puthexc
|
||||
popal
|
||||
ret
|
||||
puthexc: movb %cl, %al
|
||||
andb $0xf, %al
|
||||
cmpb $0xa, %al
|
||||
jb _puthexc2
|
||||
addb $0x27, %al
|
||||
_puthexc2: addb $0x30, %al
|
||||
movb $0xe, %ah
|
||||
movw $0x7, %bx
|
||||
int $0x10
|
||||
ret
|
||||
|
||||
|
||||
enable_a20: inb $0x92, %al
|
||||
testb $0x02, %al
|
||||
jnz _a20_out
|
||||
orb $0x02, %al
|
||||
andb $0xfe, %al
|
||||
outb %al, $0x92
|
||||
_a20_out: ret
|
||||
|
||||
|
||||
go_unreal: pushw %ds
|
||||
pushw %es
|
||||
pushw %bx
|
||||
.code32
|
||||
.byte 0x66
|
||||
.byte 0x67
|
||||
lgdt gdt_descriptor
|
||||
.code16
|
||||
movl %cr0, %eax
|
||||
orb $1, %al
|
||||
movl %eax, %cr0
|
||||
movw $8, %bx
|
||||
movw %bx, %ds
|
||||
movw %bx, %es
|
||||
decb %al
|
||||
movl %eax, %cr0
|
||||
popw %bx
|
||||
popw %es
|
||||
popw %ds
|
||||
ret
|
||||
|
||||
|
||||
startmsg: .asciz "\r\nHaiku PXE bootloader version 0.1\r\n\r\n"
|
||||
unrealmsg: .asciz "Switch to unreal mode done\r\n"
|
||||
|
||||
pxenvmsg: .asciz "PXENV+ data structure at "
|
||||
apimsg: .asciz "PXENV+ API entry point at "
|
||||
apivermsg: .asciz "API version is "
|
||||
colon: .asciz ":"
|
||||
dot: .asciz "."
|
||||
crlf: .asciz "\r\n"
|
||||
|
||||
.balign 8
|
||||
gdt:
|
||||
.long 0
|
||||
.long 0
|
||||
.long 0x0000ffff
|
||||
.long 0x00cf9200
|
||||
gdt_descriptor:
|
||||
.word 0x10
|
||||
.long gdt
|
||||
|
||||
.balign 8
|
||||
|
||||
pxenv_api: .long 0
|
||||
|
||||
|
||||
|
||||
s_PXENV_GET_CACHED_INFO:
|
||||
s_PXENV_GET_CACHED_INFO_Status: .word 0
|
||||
s_PXENV_GET_CACHED_INFO_PacketType: .word 0
|
||||
s_PXENV_GET_CACHED_INFO_BufferSize: .word 0
|
||||
s_PXENV_GET_CACHED_INFO_Buffer: .long 0
|
||||
s_PXENV_GET_CACHED_INFO_BufferLimit: .word 0
|
||||
|
||||
cached_info:
|
||||
cached_info_opcode: .byte 0
|
||||
cached_info_hardware: .byte 0
|
||||
cached_info_hardlen: .byte 0
|
||||
cached_info_gatehops: .byte 0
|
||||
cached_info_ident: .long 0
|
||||
cached_info_seconds: .word 0
|
||||
cached_info_flags: .word 0
|
||||
cached_info_cip: .long 0
|
||||
cached_info_yip: .long 0
|
||||
cached_info_sip: .long 0
|
||||
cached_info_gip: .long 0
|
||||
cached_info_mac_addr: .fill 16
|
||||
cached_info_server_name: .fill 64
|
||||
cached_info_bootfile: .fill 128
|
||||
cached_info_vendorspec: .fill 64
|
||||
|
||||
|
||||
end:
|
||||
Loading…
Reference in New Issue
Block a user