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[pxeprefix] Fetch command line (if any) via PXENV_FILE_CMDLINE

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Use PXENV_FILE_CMDLINE to retrieve the command line (if any) provided
by the invoking PXE stack.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2012-07-11 21:26:53 +01:00
parent a814eff38e
commit e84e19d4ed
1 changed files with 38 additions and 0 deletions
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38
src/arch/i386/prefix/pxeprefix.S
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@ -5,6 +5,7 @@ FILE_LICENCE ( GPL2_OR_LATER )
#define PXENV_UNDI_GET_IFACE_INFO 0x0013
#define PXENV_STOP_UNDI 0x0015
#define PXENV_UNLOAD_STACK 0x0070
#define PXENV_FILE_CMDLINE 0x00e8
#define PXE_HACK_EB54 0x0001
@ -381,6 +382,37 @@ get_iface_type:
99: movb $0x0a, %al
call print_character
/*****************************************************************************
* Check for a command line
*****************************************************************************
*/
get_cmdline:
/* Issue PXENV_FILE_CMDLINE */
xorl %esi, %esi
movw %ss, %si
movw %si, ( pxe_parameter_structure + 0x06 )
movw $PREFIX_STACK_SIZE, ( pxe_parameter_structure + 0x04 )
movw $0xffff, ( pxe_parameter_structure + 0x02 )
movw $PXENV_FILE_CMDLINE, %bx
call pxe_call
jnc 1f
call print_pxe_error
jmp 99f
1: /* Check for non-NULL command line */
movw ( pxe_parameter_structure + 0x02 ), %ax
testw %ax, %ax
jz 99f
/* Record command line */
shll $4, %esi
addl $PREFIX_STACK_SIZE, %esi
movl %esi, pxe_cmdline
99:
.section ".prefix.data", "aw", @progbits
pxe_cmdline:
.long 0
.previous
/*****************************************************************************
* Leave NIC in a safe state
*****************************************************************************
@ -728,6 +760,9 @@ run_ipxe:
movw pxe_ss, %di
movl pxe_esp, %ebp
/* Retrieve PXE command line, if any */
movl pxe_cmdline, %esi
/* Jump to .text16 segment with %ds pointing to .data16 */
movw %bx, %ds
pushw %ax
@ -738,6 +773,9 @@ run_ipxe:
/* Update the exit hook */
movw %cs, ( pxe_exit_hook + 2 )
/* Store command-line pointer */
movl %esi, cmdline_phys
/* Run main program */
pushl $main
pushw %cs