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- FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
-
- #include <librm.h>
-
- .text
- .code16
- .arch i386
- .section ".prefix", "ax", @progbits
-
- /* UNDI loader
- *
- * Called by an external program to load our PXE stack.
- */
- .globl undiloader
- undiloader:
- /* Save registers */
- pushl %esi
- pushl %edi
- pushl %ebp
- pushw %ds
- pushw %es
- pushw %bx
-
- /* ROM segment address to %ds */
- pushw %cs
- popw %ds
-
- /* UNDI loader parameter structure address into %es:%di */
- movw %sp, %bx
- movw %ss:22(%bx), %di
- movw %ss:24(%bx), %es
-
- /* Install to specified real-mode addresses */
- pushw %di
- movw %es:12(%di), %bx
- movw %es:14(%di), %ax
- movl image_source, %esi
- call undiloader_source
- xorl %edi, %edi
- orl $0xffffffff, %ebp /* Allow arbitrary relocation */
- call install_prealloc
- popw %di
-
- /* Jump to .text16 segment */
- pushw %ax
- pushw $1f
- lret
- .section ".text16", "ax", @progbits
- 1:
- /* Call UNDI loader C code */
- virtcall pxe_loader_call
-
- 1: /* Restore registers and return */
- popw %bx
- popw %es
- popw %ds
- popl %ebp
- popl %edi
- popl %esi
- lret
-
- /* Update image source address for UNDI loader
- *
- * Parameters:
- * %esi : Image source address
- * Returns:
- * %esi : Image source address
- */
- .section ".prefix", "ax", @progbits
- .globl undiloader_source
- .weak undiloader_source
- undiloader_source:
- ret
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