diff options
| author | Michael Brown <mcb30@ipxe.org> | 2021-02-18 12:13:12 +0000 |
|---|---|---|
| committer | Michael Brown <mcb30@ipxe.org> | 2021-02-18 13:53:26 +0000 |
| commit | 22bb29eabc2f68f3e60e99df4ef33984b7795a49 (patch) | |
| tree | b86e7af2881a82c0d1f1c32f3f6812d79a828b7c | |
| parent | 8446a439b37ae0a70693899363d0ee7c24fba935 (diff) | |
| download | ipxe-22bb29eabc2f68f3e60e99df4ef33984b7795a49.tar.gz | |
[prefix] Add a generic raw image prefix
Provide a generic raw image prefix, which assumes that the iPXE image
has been loaded in its entirety on a paragraph boundary.
The resulting .raw image can be loaded via RPL using an rpld.conf file
such as:
HOST {
ethernet = 00:00:00:00:00:00/6;
FILE {
path="ipxe.raw";
load=0x2000;
};
execute=0x2000;
};
Debugged-by: Johannes Heimansberg <git@jhe.dedyn.io>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
| -rw-r--r-- | src/arch/x86/prefix/rawprefix.S | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/arch/x86/prefix/rawprefix.S b/src/arch/x86/prefix/rawprefix.S new file mode 100644 index 000000000..4cf5f391e --- /dev/null +++ b/src/arch/x86/prefix/rawprefix.S @@ -0,0 +1,53 @@ +/* + * Raw binary prefix + * + * Assumes that entire image is already loaded as a contiguous block + * on a paragraph boundary and entered in real mode. + * + */ + +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ) + + .text + .arch i386 + .org 0 + .code16 + +#include <librm.h> + + .section ".prefix", "ax", @progbits + .globl _raw_start +_raw_start: + + /* Adjust %cs so that %cs:0000 is the start of the image */ + movw %cs, %ax + call 1f +1: popw %bx + subw $1b, %bx + shrw $4, %bx + addw %bx, %ax + pushw %ax + pushw $2f + lret +2: + /* Install iPXE */ + call install + + /* Set up real-mode stack */ + movw %bx, %ss + movw $_estack16, %sp + + /* Jump to .text16 segment */ + pushw %ax + pushw $1f + lret + .section ".text16", "awx", @progbits +1: + /* Run iPXE */ + virtcall main + + /* Uninstall iPXE */ + call uninstall + + /* Boot next device */ + int $0x18 |