From cc055d5ee74a3ea85744a634936957d67dd2d783 Mon Sep 17 00:00:00 2001
From: hpa <hpa>
Date: Wed, 12 Jun 2002 06:16:58 +0000
Subject: [PATCH] Add an API call to invoke the PXE stack directly.

---
 comboot.doc | 10 ++++++++++
 comboot.inc | 12 ++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/comboot.doc b/comboot.doc
index 97bb89f..50b9720 100644
--- a/comboot.doc
+++ b/comboot.doc
@@ -298,3 +298,13 @@ AX=0008h	Close file
 	will probably crash the system.
 
 
+AX=0009h	Call PXE Stack [PXELINUX ONLY]
+
+	Input:	AX	0009h
+		BX	PXE function number
+		ES:DI	PXE data buffer
+	Output:	AX	PXE return status code
+
+	Invoke an arbitrary PXE stack function.  On SYSLINUX/ISOLINUX,
+	this function returns with an error (CF=1) and no action is
+	taken.
diff --git a/comboot.inc b/comboot.inc
index e8ec32c..2804927 100644
--- a/comboot.inc
+++ b/comboot.inc
@@ -357,6 +357,17 @@ comapi_close:
 		clc
 		ret
 
+;
+; INT 22h AX=0009h	Call PXE stack
+;
+%if IS_PXELINUX
+		call far [PXENVEntry]
+		clc
+		ret
+%else
+		stc				; Function not available
+		ret
+%endif
 
 		align 2, db 0
 int22_table:
@@ -369,4 +380,5 @@ int22_table:
 		dw comapi_open			; 0006 open file
 		dw comapi_read			; 0007 read file
 		dw comapi_close			; 0008 close file
+		dw comapi_pxecall		; 0009 call PXE stack
 int22_count	equ ($-int22_table)/2
-- 
2.7.4