From: hpa <hpa>
Date: Mon, 17 Jun 2002 16:10:15 +0000 (+0000)
Subject: Add API call to determine the serial console configuration.
X-Git-Tag: syslinux-3.11~666
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ac8df6db27137f44c91fe6d57233b62b226a18e0;p=platform%2Fupstream%2Fsyslinux.git

Add API call to determine the serial console configuration.
---

diff --git a/comboot.doc b/comboot.doc
index a677b54..032eed4 100644
--- a/comboot.doc
+++ b/comboot.doc
@@ -1,4 +1,4 @@
-$Id$
+	 $Id$
 
 		       COMBOOT and COM32 files
 
@@ -363,3 +363,14 @@ AX=000Ah	Get Derivative-Specific Information
 	This call gives information specific to a particular SYSLINUX
 	derivative.  The value returned in AL is the same as is
 	returned in DL by INT 22h AX=0001h.
+
+
+AX=000Bh	Get Serial Console Configuration
+
+	Input:	AX	000Bh
+	Output:	DX	Serial port I/O base (e.g. 3F8h = COM1...)
+		CX	Baud rate divisor (1 = 115200 bps, 2 = 57600 bps...)
+		BX	Flow control configuration bits (see syslinux.doc)
+
+	If no serial port is configured, DX will be set to 0 and the
+	other registers are undefined.
diff --git a/comboot.inc b/comboot.inc
index 80b15b8..d25fd2c 100644
--- a/comboot.inc
+++ b/comboot.inc
@@ -462,6 +462,22 @@ comapi_derinfo:
 		ret
 
 ;
+; INT 22h AX=000Bh	Get Serial Console Configuration
+;
+comapi_serialcfg:
+		mov ax,[SerialPort]
+		mov P_DX,ax
+		mov ax,[BaudDivisor]
+		mov P_CX,ax
+		mov ax,[FlowControl]
+		or al,ah
+		mov ah,[FlowIgnore]
+		shr ah,4
+		mov P_BX,ax
+		clc
+		ret
+
+;
 ; This stuff should really be in the data section...
 ;
 %macro 		int21 2
@@ -495,6 +511,7 @@ int22_table:
 		dw comapi_close			; 0008 close file
 		dw comapi_pxecall		; 0009 call PXE stack
 		dw comapi_derinfo		; 000A derivative-specific info
+		dw comapi_serialcfg		; 000B get serial port config
 int22_count	equ ($-int22_table)/2
 
 APIKeyWait	db 0
diff --git a/isolinux.asm b/isolinux.asm
index 5d5e418..1fd90d4 100644
--- a/isolinux.asm
+++ b/isolinux.asm
@@ -185,6 +185,7 @@ CursorRow       resb 1			; Cursor row for message file
 ScreenSize      equ $
 VidCols         resb 1			; Columns on screen-1
 VidRows         resb 1			; Rows on screen-1
+BaudDivisor	resw 1			; Baud rate divisor
 FlowControl	equ $
 FlowOutput	resb 1			; Outputs to assert for serial flow
 FlowInput	resb 1			; Input bits for serial flow
diff --git a/ldlinux.asm b/ldlinux.asm
index f35deb6..d81353b 100644
--- a/ldlinux.asm
+++ b/ldlinux.asm
@@ -178,6 +178,7 @@ CursorRow       resb 1			; Cursor row for message file
 ScreenSize      equ $
 VidCols         resb 1			; Columns on screen-1
 VidRows         resb 1			; Rows on screen-1
+BaudDivisor	resw 1			; Baud rate divisor
 FlowControl	equ $
 FlowOutput	resb 1			; Outputs to assert for serial flow
 FlowInput	resb 1			; Input bits for serial flow
diff --git a/parseconfig.inc b/parseconfig.inc
index cee88df..96c52b4 100644
--- a/parseconfig.inc
+++ b/parseconfig.inc
@@ -170,6 +170,7 @@ pc_serial:	call getint
 		mov eax,BAUD_DIVISOR
 		cdq
 		div ebx
+		mov [BaudDivisor],ax
 		push ax				; Baud rate divisor
 		cmp di,3
 		ja .port_is_io			; If port > 3 then port is I/O addr
diff --git a/pxelinux.asm b/pxelinux.asm
index d19e171..53b46b8 100644
--- a/pxelinux.asm
+++ b/pxelinux.asm
@@ -233,6 +233,7 @@ CursorRow       resb 1			; Cursor row for message file
 ScreenSize      equ $
 VidCols         resb 1			; Columns on screen-1
 VidRows         resb 1			; Rows on screen-1
+BaudDivisor	resw 1			; Baud rate divisor
 FlowControl	equ $
 FlowOutput	resb 1			; Outputs to assert for serial flow
 FlowInput	resb 1			; Input bits for serial flow