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Support for activating a20 line through keyboard controller

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@904
This commit is contained in:
Sjoerd van der Berg 2003-04-13 18:21:09 +00:00
parent 6d2e025aef
commit 7cbbca92f4
1 changed files with 23 additions and 2 deletions
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25
src/hardware/keyboard.cpp
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@ -21,6 +21,7 @@
#include "keyboard.h"
#include "inout.h"
#include "pic.h"
#include "mem.h"
#include "mixer.h"
#define KEYBUFSIZE 32
@ -29,7 +30,8 @@
enum KeyCommands {
CMD_NONE,
CMD_SETLEDS,
CMD_SETTYPERATE
CMD_SETTYPERATE,
CMD_SETOUTPORT
};
enum KeyStates {
@ -95,7 +97,7 @@ void KEYBOARD_GetCode(void) {
keyb.buf.state=STATE_NORMAL;
break;
}
PIC_ActivateIRQ(1);
if (keyb.enabled) PIC_ActivateIRQ(1);
}
void KEYBOARD_AddCode(Bit8u scancode,Bit8u ascii,Bitu mod,KeyStates state) {
@ -181,6 +183,10 @@ static void write_p60(Bit32u port,Bit8u val) {
LOG(LOG_ERROR|LOG_KEYBOARD,"60:Unhandled command %X",val);
}
return;
case CMD_SETOUTPORT:
MEM_A20_Enable((val & 2)>0);
break;
case CMD_SETTYPERATE:
case CMD_SETLEDS:
keyb.command=CMD_NONE;
@ -208,9 +214,23 @@ static void write_p64(Bit32u port,Bit8u val) {
switch (val) {
case 0xad: /* Activate keyboard */
keyb.active=true;
if (keyb.buf.used && !keyb.scheduled) {
keyb.scheduled=true;
PIC_AddEvent(KEYBOARD_GetCode,KEYDELAY);
}
LOG(LOG_KEYBOARD,"Activated");
break;
case 0xae: /* Deactivate keyboard */
keyb.active=false;
PIC_DeActivateIRQ(1);
PIC_RemoveEvents(KEYBOARD_GetCode);
LOG(LOG_KEYBOARD,"De-Activated");
break;
case 0xd0: /* Outport on buffer */
KEYBOARD_AddCode(MEM_A20_Enabled() ? 0x02 : 0,0,0,STATE_NORMAL);
break;
case 0xd1: /* Write to outport */
keyb.command=CMD_SETOUTPORT;
break;
default:
LOG(LOG_ERROR|LOG_KEYBOARD,"Port 64 write with val %d",val);
@ -383,6 +403,7 @@ void KEYBOARD_Init(Section* sec) {
port_61_data=0; /* Direct Speaker control and output disabled */
// memset(&event_handlers,0,sizeof(event_handlers));
/* Clear the keyb struct */
keyb.active=true;
keyb.enabled=true;
keyb.command=CMD_NONE;
keyb.last_index=0;