- patch applied to CVS

bochs/patches/patch.rombios.markevich

@@ -1,146 +0,0 @@
-----------------------------------------------------------------------
-Patch name: patch.rombios.markevich
-Author: Kory Markevich
-Date: 6/20/2003
-Status: new
-
-Detailed description:
-
-Hello all, I recently tried running an old DOS game that but found that it 
-needed int 15 service 83, Start/Stop Wait Timer.  So, here's a patch that 
-adds support to the BIOS for it.
-
-I've only tested it with MS-DOS 6.22 and one game that utilized it.
-
-Patch was created with:
-  cvs diff -u
-Apply patch to what version:
-  cvs checked out on DATE, release version VER
-Instructions:
-  To patch, go to main bochs directory.
-  Type "patch -p0 < THIS_PATCH_FILE".
-----------------------------------------------------------------------
-
-Index: bios/rombios.c
-===================================================================
-RCS file: /cvsroot/bochs/bochs/bios/rombios.c,v
-retrieving revision 1.93
-diff -u -r1.93 rombios.c
---- bios/rombios.c	25 Apr 2003 22:13:24 -0000	1.93
-+++ bios/rombios.c	12 Jun 2003 01:52:14 -0000
-@@ -3352,6 +3352,48 @@
-       CLEAR_CF();
-       regs.u.r8.ah = 0;  // "ok ejection may proceed"
-       break;
-+
-+    case 0x83: {
-+      if( regs.u.r8.al == 0 ) {
-+        // Set Interval requested.
-+        if( ( read_byte( 0x40, 0xA0 ) & 1 ) == 0 ) {
-+          // Interval not already set.
-+          Bit16u bRegister = 0;
-+          Bit8u irqDisable = 0;
-+
-+          write_byte( 0x40, 0xA0, 1 );  // Set status byte.
-+          write_word( 0x40, 0x98, ES ); // Byte location, segment.
-+          write_word( 0x40, 0x9A, regs.u.r16.bx ); // Byte location, offset.
-+          write_word( 0x40, 0x9C, regs.u.r16.dx ); // Low word, delay.
-+          write_word( 0x40, 0x9E, regs.u.r16.cx ); // High word, delay.
-+          CLEAR_CF( );
-+          irqDisable = inb( 0xA1 );
-+          outb( 0xA1, irqDisable & 0xFE );
-+          bRegister = inb_cmos( 0xB );  // Unmask IRQ8 so INT70 will get through.
-+          outb_cmos( 0xB, bRegister | 0x40 ); // Turn on the Periodic Interrupt timer
-+        } else {
-+          // Interval already set.
-+          BX_DEBUG_INT15("int15: Func 83h, failed, already waiting.\n" );
-+          SET_CF();
-+          regs.u.r8.ah = UNSUPPORTED_FUNCTION;
-+        }
-+      } else if( regs.u.r8.al == 1 ) {
-+        // Clear Interval requested
-+        Bit16u bRegister = 0;
-+
-+        write_byte( 0x40, 0xA0, 0 );  // Clear status byte
-+        CLEAR_CF( );
-+        bRegister = inb_cmos( 0xB );
-+        outb_cmos( 0xB, bRegister & ~0x40 );  // Turn off the Periodic Interrupt timer
-+      } else {
-+        BX_DEBUG_INT15("int15: Func 83h, failed.\n" );
-+        SET_CF();
-+        regs.u.r8.ah = UNSUPPORTED_FUNCTION;
-+        regs.u.r8.al--;
-+      }
-+
-+      break;
-+    }
-
-     case 0x86:
-       // Wait for CX:DX microseconds. currently using the
-@@ -7479,25 +7521,50 @@
-   iret_addr_t  iret_addr; // CS,IP,Flags pushed from original INT call
-  {
-   // INT 70h: IRQ 8 - CMOS RTC interrupt from periodic or alarm modes
--  Bit8u val8;
--
--  val8 = inb_cmos(0x0c); // Status Reg C
--  if (val8 == 0) BX_PANIC("int70: regC 0\n");
--  if (val8 & 0x40) BX_PANIC("int70: periodic request\n");
--  if (val8 & 0x20) {
--    // Alarm Flag indicates alarm time matches current time
--    // call user INT 4Ah alarm handler
-+  Bit8u registerB = 0, registerC = 0;
-+
-+  // Check which modes are enabled and have occurred.
-+  registerB = inb_cmos( 0xB );
-+  registerC = inb_cmos( 0xC );
-+
-+  if( ( registerB & 0x60 ) != 0 ) {
-+    if( ( registerC & 0x20 ) != 0 ) {
-+      // Handle Alarm Interrupt.
- ASM_START
--    sti
--    //pushf
--    //;; call_ep [ds:loc]
--    //CALL_EP( 0x4a << 2 )
--    int #0x4a
--    cli
-+      sti
-+      //pushf
-+      //;; call_ep [ds:loc]
-+      //CALL_EP( 0x4a << 2 )
-+      int #0x4a
-+      cli
- ASM_END
-     }
--
--  ; //FIXME BCC BUG
-+    if( ( registerC & 0x40 ) != 0 ) {
-+      // Handle Periodic Interrupt.
-+
-+      if( read_byte( 0x40, 0xA0 ) != 0 ) {
-+        // Wait Interval (Int 15, AH=83) active.
-+        Bit32u time, toggle;
-+
-+        time = read_dword( 0x40, 0x9C );  // Time left in microseconds.
-+        if( time < 0x3D1 ) {
-+          // Done waiting.
-+          Bit16u segment, offset;
-+
-+          offset = read_word( 0x40, 0x98 );
-+          segment = read_word( 0x40, 0x9A );
-+          write_byte( 0x40, 0xA0, 0 );  // Turn of status byte.
-+          outb_cmos( 0xB, registerB & 0x37 ); // Clear the Periodic Interrupt.
-+          write_byte( segment, offset, 0x80 );  // Write to specified flag byte.
-+        } else {
-+          // Continue waiting.
-+          time -= 0x3D1;
-+          write_dword( 0x40, 0x9C, time );
-+        }
-+      }
-+    }
-+  }
-+
- ASM_START
-   call eoi_both_pics
- ASM_END