1 #------------------------------------------------------------------------------
3 #* Copyright 2006 - 2007, Intel Corporation
4 #* All rights reserved. This program and the accompanying materials
5 #* are licensed and made available under the terms and conditions of the BSD License
6 #* which accompanies this distribution. The full text of the license may be found at
7 #* http://opensource.org/licenses/bsd-license.php
9 #* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 #* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
16 #------------------------------------------------------------------------------
23 .equ FAT_DIRECTORY_ENTRY_SIZE, 0x0020
24 .equ FAT_DIRECTORY_ENTRY_SHIFT, 5
25 .equ BLOCK_SIZE, 0x0200
26 .equ BLOCK_MASK, 0x01ff
31 jmp BootSectorEntryPoint # JMP inst - 3 bytes
34 OemId: .ascii "INTEL " # OemId - 8 bytes
36 SectorSize: .word 0 # Sector Size - 16 bits
37 SectorsPerCluster: .byte 0 # Sector Per Cluster - 8 bits
38 ReservedSectors: .word 0 # Reserved Sectors - 16 bits
39 NoFats: .byte 0 # Number of FATs - 8 bits
40 RootEntries: .word 0 # Root Entries - 16 bits
41 Sectors: .word 0 # Number of Sectors - 16 bits
42 Media: .byte 0 # Media - 8 bits - ignored
43 SectorsPerFat: .word 0 # Sectors Per FAT - 16 bits
44 SectorsPerTrack: .word 0 # Sectors Per Track - 16 bits - ignored
45 Heads: .word 0 # Heads - 16 bits - ignored
46 HiddenSectors: .long 0 # Hidden Sectors - 32 bits - ignored
47 LargeSectors: .long 0 # Large Sectors - 32 bits
48 PhysicalDrive: .byte 0 # PhysicalDriveNumber - 8 bits - ignored
49 CurrentHead: .byte 0 # Current Head - 8 bits
50 Signature: .byte 0 # Signature - 8 bits - ignored
51 VolId: .ascii " " # Volume Serial Number- 4 bytes
52 FatLabel: .ascii " " # Label - 11 bytes
53 SystemId: .ascii "FAT16 " # SystemId - 8 bytes
58 # ds = 1000, es = 2000 + x (size of first cluster >> 4)
59 # cx = Start Cluster of EfiLdr
60 # dx = Start Cluster of Efivar.bin
62 # Re use the BPB data stored in Boot Sector
67 # 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already
76 # Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl
82 cmpl $0x4000, %ds:2(%di)
99 movw %ax, %es:($0) # Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId
100 movw VolId+2(%bp), %ax
105 # cx = Start Cluster of Efildr -> BS.com has filled already
106 # ES:DI = 2000:0, first cluster will be read again
107 xorw %di, %di # di = 0
112 movw %ax, %cs:JumpSegment
123 # ****************************************************************************
127 # CX = Start Cluster of File
128 # ES:DI = Buffer to store file content read from disk
131 # (ES << 4 + DI) = end of file content Buffer
133 # ****************************************************************************
135 # si = NumberOfClusters
137 # dx = CachedFatSectorNumber
138 # ds:0000 = CacheFatSectorBuffer
139 # es:di = Buffer to load file
140 # bx = NextClusterNumber
142 movw $1, %si # NumberOfClusters = 1
143 pushw %cx # Push Start Cluster onto stack
144 movw $0xfff, %dx # CachedFatSectorNumber = 0xfff
146 movw %cx, %ax # ax = ClusterNumber
147 andw $0xfff8, %ax # ax = ax & 0xfff8
148 cmpw $0xfff8, %ax # See if this is the last cluster
149 je FoundLastCluster # Jump if last cluster found
150 movw %cx, %ax # ax = ClusterNumber
151 shlw %ax # FatOffset = ClusterNumber * 2
153 movw %ax, %si # si = FatOffset
154 shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT
155 addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)
156 andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK
157 cmpw %dx, %ax # Compare FatSectorNumber to CachedFatSectorNumber
163 call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI
165 movw %ax, %dx # CachedFatSectorNumber = FatSectorNumber
167 movw (%si), %bx # bx = NextClusterNumber
168 movw %cx, %ax # ax = ClusterNumber
169 popw %si # Restore si
170 decw %bx # bx = NextClusterNumber - 1
171 cmpw %cx, %bx # See if (NextClusterNumber-1)==ClusterNumber
173 incw %bx # bx = NextClusterNumber
174 incw %si # NumberOfClusters++
175 movw %bx, %cx # ClusterNumber = NextClusterNumber
179 popw %ax # ax = StartCluster
180 pushw %bx # StartCluster = NextClusterNumber
181 movw %bx, %cx # ClusterNumber = NextClusterNumber
182 subw $2, %ax # ax = StartCluster - 2
184 movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster
185 mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster
186 addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster
187 pushw %ax # save start sector
188 movw %si, %ax # ax = NumberOfClusters
189 mulw %bx # ax = NumberOfClusters * SectorsPerCluster
190 movw %ax, %bx # bx = Number of Sectors
191 popw %ax # ax = Start Sector
193 movw $1, %si # NumberOfClusters = 1
201 # ****************************************************************************
202 # ReadBlocks - Reads a set of blocks from a block device
205 # BX = Number of Blocks to Read
206 # ES:DI = Buffer to store sectors read from disk
207 # ****************************************************************************
210 # bx = NumberOfBlocks
215 addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA
216 addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA
217 movl %eax, %esi # esi = Start LBA
218 movw %bx, %cx # cx = Number of blocks to read
220 movw $0x7bfc, %bp # bp = 0x7bfc
221 movl %esi, %eax # eax = Start LBA
222 xorl %edx, %edx # edx = 0
223 movzwl (%bp), %ebx # bx = MaxSector
224 divl %ebx # ax = StartLBA / MaxSector
225 incw %dx # dx = (StartLBA % MaxSector) + 1
227 movw (%bp), %bx # bx = MaxSector
228 subw %dx, %bx # bx = MaxSector - Sector
229 incw %bx # bx = MaxSector - Sector + 1
230 cmpw %bx, %cx # Compare (Blocks) to (MaxSector - Sector + 1)
232 movw %cx, %bx # bx = Blocks
235 movw %es, %ax # ax = es
236 shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system
237 andw $0x7f, %ax # ax = Number of blocks into current seg
238 addw %bx, %ax # ax = End Block number of transfer
239 cmpw $0x80, %ax # See if it crosses a 64K boundry
240 jle NotCrossing64KBoundry # Branch if not crossing 64K boundry
241 subw $0x80, %ax # ax = Number of blocks past 64K boundry
242 subw %ax, %bx # Decrease transfer size by block overage
243 NotCrossing64KBoundry:
244 popw %ax # restore ax
247 movb %dl, %cl # cl = (StartLBA % MaxSector) + 1 = Sector
248 xorw %dx, %dx # dx = 0
249 divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder
250 # dx = ax % (MaxHead + 1) = Head
252 pushw %bx # Save number of blocks to transfer
253 movb %dl, %dh # dh = Head
254 movw $0x7c00, %bp # bp = 0x7c00
255 movb PhysicalDrive(%bp), %dl # dl = Drive Number
256 movb %al, %ch # ch = Cylinder
257 movb %bl, %al # al = Blocks
258 movb $2, %ah # ah = Function 2
259 movw %di, %bx # es:bx = Buffer address
265 addl %ebx, %esi # StartLBA = StartLBA + NumberOfBlocks
266 subw %bx, %cx # Blocks = Blocks - NumberOfBlocks
268 shlw $(BLOCK_SHIFT-4), %bx
270 movw %ax, %es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE
279 leaw ErrorString, %si
281 jmp PrintStringAndHalt
293 .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!', 0x0c
296 LBAOffsetForBootSector:
302 #******************************************************************************
303 #******************************************************************************
304 #******************************************************************************
306 .equ DELAY_PORT, 0x0ed # Port to use for 1uS delay
307 .equ KBD_CONTROL_PORT, 0x060 # 8042 control port
308 .equ KBD_STATUS_PORT, 0x064 # 8042 status port
309 .equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port
310 .equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20
315 .byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c
326 # mov byte ptr es:[160],'a'
335 movl $0x534d4150, %edx # 0x534d4150 stands for 'SMAP'
344 subl %eax, %edi # Get the address of the memory map
345 movl %edi, MemoryMapSize # Save the size of the memory map
348 movw %cs, %bx # BX=segment
349 shll $4, %ebx # BX="linear" address of segment base
350 leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt
351 movl %eax, gdtr + 2 # Put address of gdt into the gdtr
352 leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt
353 movl %eax, idtr + 2 # Put address of idt into the idtr
354 leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map
356 addl $0x1000, %ebx # Source of EFI32
359 movl %ebx, %esi # Source of EFILDR32
363 # mov byte ptr es:[162],'b'
371 movw $0x2401, %ax # Enable A20 Gate
373 jnc A20GateEnabled # Jump if it suceeded
376 # If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.
379 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
380 jnz Timeout8042 # Jump if the 8042 timed out
381 outw %ax, $DELAY_PORT # Delay 1 uS
382 movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port
383 outb %al, $KBD_STATUS_PORT # Send command to the 8042
384 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
385 jnz Timeout8042 # Jump if the 8042 timed out
386 movb $ENABLE_A20_CMD, %al # gate address bit 20 on
387 outb %al, $KBD_CONTROL_PORT # Send command to thre 8042
388 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
389 movw $25, %cx # Delay 25 uS for the command to complete on the 8042
391 outw %ax, $DELAY_PORT # Delay 1 uS
399 # DISABLE INTERRUPTS - Entering Protected Mode
406 # mov byte ptr es:[164],'c'
419 movl $0x008, %eax # Flat data descriptor
420 movl $0x00400000, %ebp # Destination of EFILDR32
421 movl $0x00070000, %ebx # Length of copy
424 # jmp far 0010:00020000
430 Empty8042InputBuffer:
433 outw %ax, $DELAY_PORT # Delay 1us
434 inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port
435 andb $0x2, %al # Check the Input Buffer Full Flag
436 loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS
439 ##############################################################################
441 ##############################################################################
445 gdtr: .word GDT_END - GDT_BASE - 1 # GDT limit
446 .long 0 # (GDT base gets set above)
447 ##############################################################################
448 # global descriptor table (GDT)
449 ##############################################################################
456 .equ NULL_SEL, .-GDT_BASE
461 .byte 0 # limit 19:16, flags
464 # linear data segment descriptor
465 .equ LINEAR_SEL, .-GDT_BASE
466 .word 0xFFFF # limit 0xFFFFF
469 .byte 0x92 # present, ring 0, data, expand-up, writable
470 .byte 0xCF # page-granular, 32-bit
473 # linear code segment descriptor
474 .equ LINEAR_CODE_SEL, .-GDT_BASE
475 .word 0xFFFF # limit 0xFFFFF
478 .byte 0x9A # present, ring 0, data, expand-up, writable
479 .byte 0xCF # page-granular, 32-bit
482 # system data segment descriptor
483 .equ SYS_DATA_SEL, .-GDT_BASE
484 .word 0xFFFF # limit 0xFFFFF
487 .byte 0x92 # present, ring 0, data, expand-up, writable
488 .byte 0xCF # page-granular, 32-bit
491 # system code segment descriptor
492 .equ SYS_CODE_SEL, .-GDT_BASE
493 .word 0xFFFF # limit 0xFFFFF
496 .byte 0x9A # present, ring 0, data, expand-up, writable
497 .byte 0xCF # page-granular, 32-bit
500 # spare segment descriptor
501 .equ SPARE3_SEL, .-GDT_BASE
502 .word 0 # limit 0xFFFFF
505 .byte 0 # present, ring 0, data, expand-up, writable
506 .byte 0 # page-granular, 32-bit
509 # spare segment descriptor
510 .equ SPARE4_SEL, .-GDT_BASE
511 .word 0 # limit 0xFFFFF
514 .byte 0 # present, ring 0, data, expand-up, writable
515 .byte 0 # page-granular, 32-bit
518 # spare segment descriptor
519 .equ SPARE5_SEL, .-GDT_BASE
520 .word 0 # limit 0xFFFFF
523 .byte 0 # present, ring 0, data, expand-up, writable
524 .byte 0 # page-granular, 32-bit
533 idtr: .word IDT_END - IDT_BASE - 1 # IDT limit
534 .long 0 # (IDT base gets set above)
535 ##############################################################################
536 # interrupt descriptor table (IDT)
538 # Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ
539 # mappings. This implementation only uses the system timer and all other
540 # IRQs will remain masked. The descriptors for vectors 33+ are provided
542 ##############################################################################
549 # divide by zero (INT 0)
550 .equ DIV_ZERO_SEL, .-IDT_BASE
551 .word 0 # offset 15:0
552 .word SYS_CODE_SEL # selector 15:0
553 .byte 0 # 0 for interrupt gate
554 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
555 .word 0 # offset 31:16
557 # debug exception (INT 1)
558 .equ DEBUG_EXCEPT_SEL, .-IDT_BASE
559 .word 0 # offset 15:0
560 .word SYS_CODE_SEL # selector 15:0
561 .byte 0 # 0 for interrupt gate
562 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
563 .word 0 # offset 31:16
566 .equ NMI_SEL, .-IDT_BASE
567 .word 0 # offset 15:0
568 .word SYS_CODE_SEL # selector 15:0
569 .byte 0 # 0 for interrupt gate
570 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
571 .word 0 # offset 31:16
573 # soft breakpoint (INT 3)
574 .equ BREAKPOINT_SEL, .-IDT_BASE
575 .word 0 # offset 15:0
576 .word SYS_CODE_SEL # selector 15:0
577 .byte 0 # 0 for interrupt gate
578 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
579 .word 0 # offset 31:16
582 .equ OVERFLOW_SEL, .-IDT_BASE
583 .word 0 # offset 15:0
584 .word SYS_CODE_SEL # selector 15:0
585 .byte 0 # 0 for interrupt gate
586 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
587 .word 0 # offset 31:16
589 # bounds check (INT 5)
590 .equ BOUNDS_CHECK_SEL, .-IDT_BASE
591 .word 0 # offset 15:0
592 .word SYS_CODE_SEL # selector 15:0
593 .byte 0 # 0 for interrupt gate
594 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
595 .word 0 # offset 31:16
597 # invalid opcode (INT 6)
598 .equ INVALID_OPCODE_SEL, .-IDT_BASE
599 .word 0 # offset 15:0
600 .word SYS_CODE_SEL # selector 15:0
601 .byte 0 # 0 for interrupt gate
602 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
603 .word 0 # offset 31:16
605 # device not available (INT 7)
606 .equ DEV_NOT_AVAIL_SEL, .-IDT_BASE
607 .word 0 # offset 15:0
608 .word SYS_CODE_SEL # selector 15:0
609 .byte 0 # 0 for interrupt gate
610 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
611 .word 0 # offset 31:16
613 # double fault (INT 8)
614 .equ DOUBLE_FAULT_SEL, .-IDT_BASE
615 .word 0 # offset 15:0
616 .word SYS_CODE_SEL # selector 15:0
617 .byte 0 # 0 for interrupt gate
618 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
619 .word 0 # offset 31:16
621 # Coprocessor segment overrun - reserved (INT 9)
622 .equ RSVD_INTR_SEL1, .-IDT_BASE
623 .word 0 # offset 15:0
624 .word SYS_CODE_SEL # selector 15:0
625 .byte 0 # 0 for interrupt gate
626 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
627 .word 0 # offset 31:16
629 # invalid TSS (INT 0ah)
630 .equ INVALID_TSS_SEL, .-IDT_BASE
631 .word 0 # offset 15:0
632 .word SYS_CODE_SEL # selector 15:0
633 .byte 0 # 0 for interrupt gate
634 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
635 .word 0 # offset 31:16
637 # segment not present (INT 0bh)
638 .equ SEG_NOT_PRESENT_SEL, .-IDT_BASE
639 .word 0 # offset 15:0
640 .word SYS_CODE_SEL # selector 15:0
641 .byte 0 # 0 for interrupt gate
642 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
643 .word 0 # offset 31:16
645 # stack fault (INT 0ch)
646 .equ STACK_FAULT_SEL, .-IDT_BASE
647 .word 0 # offset 15:0
648 .word SYS_CODE_SEL # selector 15:0
649 .byte 0 # 0 for interrupt gate
650 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
651 .word 0 # offset 31:16
653 # general protection (INT 0dh)
654 .equ GP_FAULT_SEL, .-IDT_BASE
655 .word 0 # offset 15:0
656 .word SYS_CODE_SEL # selector 15:0
657 .byte 0 # 0 for interrupt gate
658 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
659 .word 0 # offset 31:16
661 # page fault (INT 0eh)
662 .equ PAGE_FAULT_SEL, .-IDT_BASE
663 .word 0 # offset 15:0
664 .word SYS_CODE_SEL # selector 15:0
665 .byte 0 # 0 for interrupt gate
666 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
667 .word 0 # offset 31:16
669 # Intel reserved - do not use (INT 0fh)
670 .equ RSVD_INTR_SEL2, .-IDT_BASE
671 .word 0 # offset 15:0
672 .word SYS_CODE_SEL # selector 15:0
673 .byte 0 # 0 for interrupt gate
674 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
675 .word 0 # offset 31:16
677 # floating point error (INT 10h)
678 .equ FLT_POINT_ERR_SEL, .-IDT_BASE
679 .word 0 # offset 15:0
680 .word SYS_CODE_SEL # selector 15:0
681 .byte 0 # 0 for interrupt gate
682 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
683 .word 0 # offset 31:16
685 # alignment check (INT 11h)
686 .equ ALIGNMENT_CHECK_SEL, .-IDT_BASE
687 .word 0 # offset 15:0
688 .word SYS_CODE_SEL # selector 15:0
689 .byte 0 # 0 for interrupt gate
690 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
691 .word 0 # offset 31:16
693 # machine check (INT 12h)
694 .equ MACHINE_CHECK_SEL, .-IDT_BASE
695 .word 0 # offset 15:0
696 .word SYS_CODE_SEL # selector 15:0
697 .byte 0 # 0 for interrupt gate
698 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
699 .word 0 # offset 31:16
701 # SIMD floating-point exception (INT 13h)
702 .equ SIMD_EXCEPTION_SEL, .-IDT_BASE
703 .word 0 # offset 15:0
704 .word SYS_CODE_SEL # selector 15:0
705 .byte 0 # 0 for interrupt gate
706 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
707 .word 0 # offset 31:16
709 # 85 unspecified descriptors, First 12 of them are reserved, the rest are avail
712 # IRQ 0 (System timer) - (INT 68h)
713 .equ IRQ0_SEL, .-IDT_BASE
714 .word 0 # offset 15:0
715 .word SYS_CODE_SEL # selector 15:0
716 .byte 0 # 0 for interrupt gate
717 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
718 .word 0 # offset 31:16
720 # IRQ 1 (8042 Keyboard controller) - (INT 69h)
721 .equ IRQ1_SEL, .-IDT_BASE
722 .word 0 # offset 15:0
723 .word SYS_CODE_SEL # selector 15:0
724 .byte 0 # 0 for interrupt gate
725 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
726 .word 0 # offset 31:16
728 # Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)
729 .equ IRQ2_SEL, .-IDT_BASE
730 .word 0 # offset 15:0
731 .word SYS_CODE_SEL # selector 15:0
732 .byte 0 # 0 for interrupt gate
733 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
734 .word 0 # offset 31:16
736 # IRQ 3 (COM 2) - (INT 6bh)
737 .equ IRQ3_SEL, .-IDT_BASE
738 .word 0 # offset 15:0
739 .word SYS_CODE_SEL # selector 15:0
740 .byte 0 # 0 for interrupt gate
741 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
742 .word 0 # offset 31:16
744 # IRQ 4 (COM 1) - (INT 6ch)
745 .equ IRQ4_SEL, .-IDT_BASE
746 .word 0 # offset 15:0
747 .word SYS_CODE_SEL # selector 15:0
748 .byte 0 # 0 for interrupt gate
749 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
750 .word 0 # offset 31:16
752 # IRQ 5 (LPT 2) - (INT 6dh)
753 .equ IRQ5_SEL, .-IDT_BASE
754 .word 0 # offset 15:0
755 .word SYS_CODE_SEL # selector 15:0
756 .byte 0 # 0 for interrupt gate
757 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
758 .word 0 # offset 31:16
760 # IRQ 6 (Floppy controller) - (INT 6eh)
761 .equ IRQ6_SEL, .-IDT_BASE
762 .word 0 # offset 15:0
763 .word SYS_CODE_SEL # selector 15:0
764 .byte 0 # 0 for interrupt gate
765 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
766 .word 0 # offset 31:16
768 # IRQ 7 (LPT 1) - (INT 6fh)
769 .equ IRQ7_SEL, .-IDT_BASE
770 .word 0 # offset 15:0
771 .word SYS_CODE_SEL # selector 15:0
772 .byte 0 # 0 for interrupt gate
773 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
774 .word 0 # offset 31:16
776 # IRQ 8 (RTC Alarm) - (INT 70h)
777 .equ IRQ8_SEL, .-IDT_BASE
778 .word 0 # offset 15:0
779 .word SYS_CODE_SEL # selector 15:0
780 .byte 0 # 0 for interrupt gate
781 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
782 .word 0 # offset 31:16
785 .equ IRQ9_SEL, .-IDT_BASE
786 .word 0 # offset 15:0
787 .word SYS_CODE_SEL # selector 15:0
788 .byte 0 # 0 for interrupt gate
789 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
790 .word 0 # offset 31:16
793 .equ IRQ10_SEL, .-IDT_BASE
794 .word 0 # offset 15:0
795 .word SYS_CODE_SEL # selector 15:0
796 .byte 0 # 0 for interrupt gate
797 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
798 .word 0 # offset 31:16
801 .equ IRQ11_SEL, .-IDT_BASE
802 .word 0 # offset 15:0
803 .word SYS_CODE_SEL # selector 15:0
804 .byte 0 # 0 for interrupt gate
805 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
806 .word 0 # offset 31:16
808 # IRQ 12 (PS/2 mouse) - (INT 74h)
809 .equ IRQ12_SEL, .-IDT_BASE
810 .word 0 # offset 15:0
811 .word SYS_CODE_SEL # selector 15:0
812 .byte 0 # 0 for interrupt gate
813 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
814 .word 0 # offset 31:16
816 # IRQ 13 (Floating point error) - (INT 75h)
817 .equ IRQ13_SEL, .-IDT_BASE
818 .word 0 # offset 15:0
819 .word SYS_CODE_SEL # selector 15:0
820 .byte 0 # 0 for interrupt gate
821 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
822 .word 0 # offset 31:16
824 # IRQ 14 (Secondary IDE) - (INT 76h)
825 .equ IRQ14_SEL, .-IDT_BASE
826 .word 0 # offset 15:0
827 .word SYS_CODE_SEL # selector 15:0
828 .byte 0 # 0 for interrupt gate
829 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
830 .word 0 # offset 31:16
832 # IRQ 15 (Primary IDE) - (INT 77h)
833 .equ IRQ15_SEL, .-IDT_BASE
834 .word 0 # offset 15:0
835 .word SYS_CODE_SEL # selector 15:0
836 .byte 0 # 0 for interrupt gate
837 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
838 .word 0 # offset 31:16
844 MemoryMapSize: .long 0
845 MemoryMap: .long 0,0,0,0,0,0,0,0
846 .long 0,0,0,0,0,0,0,0
847 .long 0,0,0,0,0,0,0,0
848 .long 0,0,0,0,0,0,0,0
849 .long 0,0,0,0,0,0,0,0
850 .long 0,0,0,0,0,0,0,0
851 .long 0,0,0,0,0,0,0,0
852 .long 0,0,0,0,0,0,0,0
853 .long 0,0,0,0,0,0,0,0
854 .long 0,0,0,0,0,0,0,0
855 .long 0,0,0,0,0,0,0,0
856 .long 0,0,0,0,0,0,0,0
857 .long 0,0,0,0,0,0,0,0
858 .long 0,0,0,0,0,0,0,0
859 .long 0,0,0,0,0,0,0,0
860 .long 0,0,0,0,0,0,0,0
861 .long 0,0,0,0,0,0,0,0
862 .long 0,0,0,0,0,0,0,0
863 .long 0,0,0,0,0,0,0,0
864 .long 0,0,0,0,0,0,0,0
865 .long 0,0,0,0,0,0,0,0
866 .long 0,0,0,0,0,0,0,0
867 .long 0,0,0,0,0,0,0,0
868 .long 0,0,0,0,0,0,0,0
869 .long 0,0,0,0,0,0,0,0
870 .long 0,0,0,0,0,0,0,0
871 .long 0,0,0,0,0,0,0,0
872 .long 0,0,0,0,0,0,0,0
873 .long 0,0,0,0,0,0,0,0
874 .long 0,0,0,0,0,0,0,0
876 .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
877 .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
881 # below is the pieces of the IVT that is used to redirect INT 68h - 6fh
882 # back to INT 08h - 0fh when in real mode... It is 'org'ed to a
883 # known low address (20f00) so it can be set up by PlMapIrqToVect in