diff options
Diffstat (limited to 'src/arch/i386/prefix/undiloader.S')
| -rw-r--r-- | src/arch/i386/prefix/undiloader.S | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/arch/i386/prefix/undiloader.S b/src/arch/i386/prefix/undiloader.S new file mode 100644 index 00000000..36c1bef3 --- /dev/null +++ b/src/arch/i386/prefix/undiloader.S @@ -0,0 +1,49 @@ + .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 + 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:18(%bx), %di + movw %ss:20(%bx), %es + /* Install to specified real-mode addresses */ + pushw %di + movw %es:12(%di), %bx + movw %es:14(%di), %ax + movl image_source, %esi + movl decompress_to, %edi + call install_prealloc + popw %di + /* Call UNDI loader C code */ + pushl $pxe_loader_call + pushw %cs + pushw $1f + pushw %ax + pushw $prot_call + lret +1: popw %bx /* discard */ + popw %bx /* discard */ + /* Restore registers and return */ + popw %bx + popw %es + popw %ds + popl %edi + popl %esi + lret + .size undiloader, . - undiloader |