| FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ) |
| |
| #include <librm.h> |
| |
| .section ".note.GNU-stack", "", @progbits |
| .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 |
