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Update comments on reboot-shutdown functionality

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3726
This commit is contained in:
Ralf Grillenberger 2011-06-19 16:27:28 +00:00
parent df67bd2afb
commit cc5f9e2810
1 changed files with 16 additions and 5 deletions
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21
src/ints/bios.cpp
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@ -1058,19 +1058,30 @@ public:
callback[9].Set_RealVec(0x71);
/* Reboot */
// This handler is an exit for more than only reboots, since we
// don't handle these cases
callback[10].Install(&Reboot_Handler,CB_IRET,"reboot");
// INT 18h: Enter BASIC
// Non-IBM BIOS would display "NO ROM BASIC" here
callback[10].Set_RealVec(0x18);
RealPt rptr = callback[10].Get_RealPointer();
// INT 19h: Boot function
// This is not a complete reboot as it happens after the POST
// We don't handle it, so use the reboot function as exit.
RealSetVec(0x19,rptr);
// power on selftest routine location
phys_writeb(Real2Phys(BIOS_DEFAULT_RESET_LOCATION)+0,0xEA); // FARJMP
phys_writew(Real2Phys(BIOS_DEFAULT_RESET_LOCATION)+1,RealOff(rptr)); // offset
phys_writew(Real2Phys(BIOS_DEFAULT_RESET_LOCATION)+3,RealSeg(rptr)); // segment
// reset jump (directed to POST)
// The farjump at the processor reset entry point (jumps to POST routine)
phys_writeb(0xFFFF0,0xEA); // FARJMP
phys_writew(0xFFFF1,RealOff(BIOS_DEFAULT_RESET_LOCATION)); // offset
phys_writew(0xFFFF3,RealSeg(BIOS_DEFAULT_RESET_LOCATION)); // segment
// Compatible POST routine location: jump to the callback
phys_writeb(Real2Phys(BIOS_DEFAULT_RESET_LOCATION)+0,0xEA); // FARJMP
phys_writew(Real2Phys(BIOS_DEFAULT_RESET_LOCATION)+1,RealOff(rptr)); // offset
phys_writew(Real2Phys(BIOS_DEFAULT_RESET_LOCATION)+3,RealSeg(rptr)); // segment
/* Irq 2 */
Bitu call_irq2=CALLBACK_Allocate();
CALLBACK_Setup(call_irq2,NULL,CB_IRET_EOI_PIC1,Real2Phys(BIOS_DEFAULT_IRQ2_LOCATION),"irq 2 bios");