1 #------------------------------------------------------------------------------
3 #* Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
4 #* 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
35 jmp BootSectorEntryPoint # JMP inst - 3 bytes
38 OemId: .ascii "INTEL " # OemId - 8 bytes
40 SectorSize: .word 0 # Sector Size - 16 bits
41 SectorsPerCluster: .byte 0 # Sector Per Cluster - 8 bits
42 ReservedSectors: .word 0 # Reserved Sectors - 16 bits
43 NoFats: .byte 0 # Number of FATs - 8 bits
44 RootEntries: .word 0 # Root Entries - 16 bits
45 Sectors: .word 0 # Number of Sectors - 16 bits
46 Media: .byte 0 # Media - 8 bits - ignored
47 SectorsPerFat: .word 0 # Sectors Per FAT - 16 bits
48 SectorsPerTrack: .word 0 # Sectors Per Track - 16 bits - ignored
49 Heads: .word 0 # Heads - 16 bits - ignored
50 HiddenSectors: .long 0 # Hidden Sectors - 32 bits - ignored
51 LargeSectors: .long 0 # Large Sectors - 32 bits
52 PhysicalDrive: .byte 0 # PhysicalDriveNumber - 8 bits - ignored
53 CurrentHead: .byte 0 # Current Head - 8 bits
54 Signature: .byte 0 # Signature - 8 bits - ignored
55 VolId: .ascii " " # Volume Serial Number- 4 bytes
56 FatLabel: .ascii " " # Label - 11 bytes
57 SystemId: .ascii "FAT16 " # SystemId - 8 bytes
62 # ds = 1000, es = 2000 + x (size of first cluster >> 4)
63 # cx = Start Cluster of EfiLdr
64 # dx = Start Cluster of Efivar.bin
66 # Re use the BPB data stored in Boot Sector
71 # 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already
80 # Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl
86 cmpl $0x4000, %ds:2(%di)
103 movw %ax, %es:0 # Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId
104 movw VolId+2(%bp), %ax
109 # cx = Start Cluster of Efildr -> BS.com has filled already
110 # ES:DI = 2000:0, first cluster will be read again
111 xorw %di, %di # di = 0
116 movw %ax, %cs:JumpSegment
127 # ****************************************************************************
131 # CX = Start Cluster of File
132 # ES:DI = Buffer to store file content read from disk
135 # (ES << 4 + DI) = end of file content Buffer
137 # ****************************************************************************
139 # si = NumberOfClusters
141 # dx = CachedFatSectorNumber
142 # ds:0000 = CacheFatSectorBuffer
143 # es:di = Buffer to load file
144 # bx = NextClusterNumber
146 movw $1, %si # NumberOfClusters = 1
147 pushw %cx # Push Start Cluster onto stack
148 movw $0xfff, %dx # CachedFatSectorNumber = 0xfff
150 movw %cx, %ax # ax = ClusterNumber
151 andw $0xfff8, %ax # ax = ax & 0xfff8
152 cmpw $0xfff8, %ax # See if this is the last cluster
153 je FoundLastCluster # Jump if last cluster found
154 movw %cx, %ax # ax = ClusterNumber
155 shlw %ax # FatOffset = ClusterNumber * 2
157 movw %ax, %si # si = FatOffset
158 shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT
159 addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)
160 andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK
161 cmpw %dx, %ax # Compare FatSectorNumber to CachedFatSectorNumber
167 call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI
169 movw %ax, %dx # CachedFatSectorNumber = FatSectorNumber
171 movw (%si), %bx # bx = NextClusterNumber
172 movw %cx, %ax # ax = ClusterNumber
173 popw %si # Restore si
174 decw %bx # bx = NextClusterNumber - 1
175 cmpw %cx, %bx # See if (NextClusterNumber-1)==ClusterNumber
177 incw %bx # bx = NextClusterNumber
178 incw %si # NumberOfClusters++
179 movw %bx, %cx # ClusterNumber = NextClusterNumber
183 popw %ax # ax = StartCluster
184 pushw %bx # StartCluster = NextClusterNumber
185 movw %bx, %cx # ClusterNumber = NextClusterNumber
186 subw $2, %ax # ax = StartCluster - 2
188 movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster
189 mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster
190 addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster
191 pushw %ax # save start sector
192 movw %si, %ax # ax = NumberOfClusters
193 mulw %bx # ax = NumberOfClusters * SectorsPerCluster
194 movw %ax, %bx # bx = Number of Sectors
195 popw %ax # ax = Start Sector
197 movw $1, %si # NumberOfClusters = 1
205 # ****************************************************************************
206 # ReadBlocks - Reads a set of blocks from a block device
209 # BX = Number of Blocks to Read
210 # ES:DI = Buffer to store sectors read from disk
211 # ****************************************************************************
214 # bx = NumberOfBlocks
219 addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA
220 addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA
221 movl %eax, %esi # esi = Start LBA
222 movw %bx, %cx # cx = Number of blocks to read
224 movw $0x7bfc, %bp # bp = 0x7bfc
225 movl %esi, %eax # eax = Start LBA
226 xorl %edx, %edx # edx = 0
227 movzwl (%bp), %ebx # bx = MaxSector
228 divl %ebx # ax = StartLBA / MaxSector
229 incw %dx # dx = (StartLBA % MaxSector) + 1
231 movw (%bp), %bx # bx = MaxSector
232 subw %dx, %bx # bx = MaxSector - Sector
233 incw %bx # bx = MaxSector - Sector + 1
234 cmpw %bx, %cx # Compare (Blocks) to (MaxSector - Sector + 1)
236 movw %cx, %bx # bx = Blocks
239 movw %es, %ax # ax = es
240 shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system
241 andw $0x7f, %ax # ax = Number of blocks into current seg
242 addw %bx, %ax # ax = End Block number of transfer
243 cmpw $0x80, %ax # See if it crosses a 64K boundry
244 jle NotCrossing64KBoundry # Branch if not crossing 64K boundry
245 subw $0x80, %ax # ax = Number of blocks past 64K boundry
246 subw %ax, %bx # Decrease transfer size by block overage
247 NotCrossing64KBoundry:
248 popw %ax # restore ax
251 movb %dl, %cl # cl = (StartLBA % MaxSector) + 1 = Sector
252 xorw %dx, %dx # dx = 0
253 divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder
254 # dx = ax % (MaxHead + 1) = Head
256 pushw %bx # Save number of blocks to transfer
257 movb %dl, %dh # dh = Head
258 movw $0x7c00, %bp # bp = 0x7c00
259 movb PhysicalDrive(%bp), %dl # dl = Drive Number
260 movb %al, %ch # ch = Cylinder
261 movb %bl, %al # al = Blocks
262 movb $2, %ah # ah = Function 2
263 movw %di, %bx # es:bx = Buffer address
269 addl %ebx, %esi # StartLBA = StartLBA + NumberOfBlocks
270 subw %bx, %cx # Blocks = Blocks - NumberOfBlocks
272 shlw $(BLOCK_SHIFT-4), %bx
274 movw %ax, %es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE
283 leaw ErrorString, %si
285 jmp PrintStringAndHalt
297 .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!', 0x0c
299 # .org 0x01fa # Just for passing build.
300 LBAOffsetForBootSector:
303 # .org 0x01fe # Just for passing build.
306 #******************************************************************************
307 #******************************************************************************
308 #******************************************************************************
310 .equ DELAY_PORT, 0x0ed # Port to use for 1uS delay
311 .equ KBD_CONTROL_PORT, 0x060 # 8042 control port
312 .equ KBD_STATUS_PORT, 0x064 # 8042 status port
313 .equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port
314 .equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20
316 # .org 0x0200 # Just for passing build.
319 .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
330 # mov byte ptr es:[160],'a'
339 movl $0x534d4150, %edx # 0x534d4150 stands for 'SMAP'
348 subl %eax, %edi # Get the address of the memory map
349 movl %edi, MemoryMapSize # Save the size of the memory map
352 movw %cs, %bx # BX=segment
353 shll $4, %ebx # BX="linear" address of segment base
354 leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt
355 movl %eax, gdtr + 2 # Put address of gdt into the gdtr
356 leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt
357 movl %eax, idtr + 2 # Put address of idt into the idtr
358 leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map
360 addl $0x1000, %ebx # Source of EFI32
363 movl %ebx, %esi # Source of EFILDR32
367 # mov byte ptr es:[162],'b'
375 movw $0x2401, %ax # Enable A20 Gate
377 jnc A20GateEnabled # Jump if it suceeded
380 # If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.
383 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
384 jnz Timeout8042 # Jump if the 8042 timed out
385 outw %ax, $DELAY_PORT # Delay 1 uS
386 movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port
387 outb %al, $KBD_STATUS_PORT # Send command to the 8042
388 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
389 jnz Timeout8042 # Jump if the 8042 timed out
390 movb $ENABLE_A20_CMD, %al # gate address bit 20 on
391 outb %al, $KBD_CONTROL_PORT # Send command to thre 8042
392 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
393 movw $25, %cx # Delay 25 uS for the command to complete on the 8042
395 outw %ax, $DELAY_PORT # Delay 1 uS
401 movw $0x0008, %bx # Flat data descriptor
403 # DISABLE INTERRUPTS - Entering Protected Mode
410 # mov byte ptr es:[164],'c'
423 # jmp far 0010:00020000
429 Empty8042InputBuffer:
432 outw %ax, $DELAY_PORT # Delay 1us
433 inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port
434 andb $0x2, %al # Check the Input Buffer Full Flag
435 loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS
438 ##############################################################################
440 ##############################################################################
444 gdtr: .word GDT_END - GDT_BASE - 1 # GDT limit
445 .long 0 # (GDT base gets set above)
446 ##############################################################################
447 # global descriptor table (GDT)
448 ##############################################################################
454 .equ NULL_SEL, .-GDT_BASE
459 .byte 0 # limit 19:16, flags
462 # linear data segment descriptor
463 .equ LINEAR_SEL, .-GDT_BASE
464 .word 0xFFFF # limit 0xFFFFF
467 .byte 0x92 # present, ring 0, data, expand-up, writable
468 .byte 0xCF # page-granular, 32-bit
471 # linear code segment descriptor
472 .equ LINEAR_CODE_SEL, .-GDT_BASE
473 .word 0xFFFF # limit 0xFFFFF
476 .byte 0x9A # present, ring 0, data, expand-up, writable
477 .byte 0xCF # page-granular, 32-bit
480 # system data segment descriptor
481 .equ SYS_DATA_SEL, .-GDT_BASE
482 .word 0xFFFF # limit 0xFFFFF
485 .byte 0x92 # present, ring 0, data, expand-up, writable
486 .byte 0xCF # page-granular, 32-bit
489 # system code segment descriptor
490 .equ SYS_CODE_SEL, .-GDT_BASE
491 .word 0xFFFF # limit 0xFFFFF
494 .byte 0x9A # present, ring 0, data, expand-up, writable
495 .byte 0xCF # page-granular, 32-bit
498 # spare segment descriptor
499 .equ SPARE3_SEL, .-GDT_BASE
500 .word 0 # limit 0xFFFFF
503 .byte 0 # present, ring 0, data, expand-up, writable
504 .byte 0 # page-granular, 32-bit
507 # spare segment descriptor
508 .equ SPARE4_SEL, .-GDT_BASE
509 .word 0 # limit 0xFFFFF
512 .byte 0 # present, ring 0, data, expand-up, writable
513 .byte 0 # page-granular, 32-bit
516 # spare segment descriptor
517 .equ SPARE5_SEL, .-GDT_BASE
518 .word 0 # limit 0xFFFFF
521 .byte 0 # present, ring 0, data, expand-up, writable
522 .byte 0 # page-granular, 32-bit
531 idtr: .word IDT_END - IDT_BASE - 1 # IDT limit
532 .long 0 # (IDT base gets set above)
533 ##############################################################################
534 # interrupt descriptor table (IDT)
536 # Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ
537 # mappings. This implementation only uses the system timer and all other
538 # IRQs will remain masked. The descriptors for vectors 33+ are provided
540 ##############################################################################
546 # divide by zero (INT 0)
547 .equ DIV_ZERO_SEL, .-IDT_BASE
548 .word 0 # offset 15:0
549 .word SYS_CODE_SEL # selector 15:0
550 .byte 0 # 0 for interrupt gate
551 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
552 .word 0 # offset 31:16
554 # debug exception (INT 1)
555 .equ DEBUG_EXCEPT_SEL, .-IDT_BASE
556 .word 0 # offset 15:0
557 .word SYS_CODE_SEL # selector 15:0
558 .byte 0 # 0 for interrupt gate
559 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
560 .word 0 # offset 31:16
563 .equ NMI_SEL, .-IDT_BASE
564 .word 0 # offset 15:0
565 .word SYS_CODE_SEL # selector 15:0
566 .byte 0 # 0 for interrupt gate
567 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
568 .word 0 # offset 31:16
570 # soft breakpoint (INT 3)
571 .equ BREAKPOINT_SEL, .-IDT_BASE
572 .word 0 # offset 15:0
573 .word SYS_CODE_SEL # selector 15:0
574 .byte 0 # 0 for interrupt gate
575 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
576 .word 0 # offset 31:16
579 .equ OVERFLOW_SEL, .-IDT_BASE
580 .word 0 # offset 15:0
581 .word SYS_CODE_SEL # selector 15:0
582 .byte 0 # 0 for interrupt gate
583 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
584 .word 0 # offset 31:16
586 # bounds check (INT 5)
587 .equ BOUNDS_CHECK_SEL, .-IDT_BASE
588 .word 0 # offset 15:0
589 .word SYS_CODE_SEL # selector 15:0
590 .byte 0 # 0 for interrupt gate
591 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
592 .word 0 # offset 31:16
594 # invalid opcode (INT 6)
595 .equ INVALID_OPCODE_SEL, .-IDT_BASE
596 .word 0 # offset 15:0
597 .word SYS_CODE_SEL # selector 15:0
598 .byte 0 # 0 for interrupt gate
599 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
600 .word 0 # offset 31:16
602 # device not available (INT 7)
603 .equ DEV_NOT_AVAIL_SEL, .-IDT_BASE
604 .word 0 # offset 15:0
605 .word SYS_CODE_SEL # selector 15:0
606 .byte 0 # 0 for interrupt gate
607 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
608 .word 0 # offset 31:16
610 # double fault (INT 8)
611 .equ DOUBLE_FAULT_SEL, .-IDT_BASE
612 .word 0 # offset 15:0
613 .word SYS_CODE_SEL # selector 15:0
614 .byte 0 # 0 for interrupt gate
615 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
616 .word 0 # offset 31:16
618 # Coprocessor segment overrun - reserved (INT 9)
619 .equ RSVD_INTR_SEL1, .-IDT_BASE
620 .word 0 # offset 15:0
621 .word SYS_CODE_SEL # selector 15:0
622 .byte 0 # 0 for interrupt gate
623 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
624 .word 0 # offset 31:16
626 # invalid TSS (INT 0ah)
627 .equ INVALID_TSS_SEL, .-IDT_BASE
628 .word 0 # offset 15:0
629 .word SYS_CODE_SEL # selector 15:0
630 .byte 0 # 0 for interrupt gate
631 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
632 .word 0 # offset 31:16
634 # segment not present (INT 0bh)
635 .equ SEG_NOT_PRESENT_SEL, .-IDT_BASE
636 .word 0 # offset 15:0
637 .word SYS_CODE_SEL # selector 15:0
638 .byte 0 # 0 for interrupt gate
639 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
640 .word 0 # offset 31:16
642 # stack fault (INT 0ch)
643 .equ STACK_FAULT_SEL, .-IDT_BASE
644 .word 0 # offset 15:0
645 .word SYS_CODE_SEL # selector 15:0
646 .byte 0 # 0 for interrupt gate
647 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
648 .word 0 # offset 31:16
650 # general protection (INT 0dh)
651 .equ GP_FAULT_SEL, .-IDT_BASE
652 .word 0 # offset 15:0
653 .word SYS_CODE_SEL # selector 15:0
654 .byte 0 # 0 for interrupt gate
655 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
656 .word 0 # offset 31:16
658 # page fault (INT 0eh)
659 .equ PAGE_FAULT_SEL, .-IDT_BASE
660 .word 0 # offset 15:0
661 .word SYS_CODE_SEL # selector 15:0
662 .byte 0 # 0 for interrupt gate
663 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
664 .word 0 # offset 31:16
666 # Intel reserved - do not use (INT 0fh)
667 .equ RSVD_INTR_SEL2, .-IDT_BASE
668 .word 0 # offset 15:0
669 .word SYS_CODE_SEL # selector 15:0
670 .byte 0 # 0 for interrupt gate
671 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
672 .word 0 # offset 31:16
674 # floating point error (INT 10h)
675 .equ FLT_POINT_ERR_SEL, .-IDT_BASE
676 .word 0 # offset 15:0
677 .word SYS_CODE_SEL # selector 15:0
678 .byte 0 # 0 for interrupt gate
679 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
680 .word 0 # offset 31:16
682 # alignment check (INT 11h)
683 .equ ALIGNMENT_CHECK_SEL, .-IDT_BASE
684 .word 0 # offset 15:0
685 .word SYS_CODE_SEL # selector 15:0
686 .byte 0 # 0 for interrupt gate
687 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
688 .word 0 # offset 31:16
690 # machine check (INT 12h)
691 .equ MACHINE_CHECK_SEL, .-IDT_BASE
692 .word 0 # offset 15:0
693 .word SYS_CODE_SEL # selector 15:0
694 .byte 0 # 0 for interrupt gate
695 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
696 .word 0 # offset 31:16
698 # SIMD floating-point exception (INT 13h)
699 .equ SIMD_EXCEPTION_SEL, .-IDT_BASE
700 .word 0 # offset 15:0
701 .word SYS_CODE_SEL # selector 15:0
702 .byte 0 # 0 for interrupt gate
703 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
704 .word 0 # offset 31:16
706 # 85 unspecified descriptors, First 12 of them are reserved, the rest are avail
709 # IRQ 0 (System timer) - (INT 68h)
710 .equ IRQ0_SEL, .-IDT_BASE
711 .word 0 # offset 15:0
712 .word SYS_CODE_SEL # selector 15:0
713 .byte 0 # 0 for interrupt gate
714 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
715 .word 0 # offset 31:16
717 # IRQ 1 (8042 Keyboard controller) - (INT 69h)
718 .equ IRQ1_SEL, .-IDT_BASE
719 .word 0 # offset 15:0
720 .word SYS_CODE_SEL # selector 15:0
721 .byte 0 # 0 for interrupt gate
722 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
723 .word 0 # offset 31:16
725 # Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)
726 .equ IRQ2_SEL, .-IDT_BASE
727 .word 0 # offset 15:0
728 .word SYS_CODE_SEL # selector 15:0
729 .byte 0 # 0 for interrupt gate
730 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
731 .word 0 # offset 31:16
733 # IRQ 3 (COM 2) - (INT 6bh)
734 .equ IRQ3_SEL, .-IDT_BASE
735 .word 0 # offset 15:0
736 .word SYS_CODE_SEL # selector 15:0
737 .byte 0 # 0 for interrupt gate
738 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
739 .word 0 # offset 31:16
741 # IRQ 4 (COM 1) - (INT 6ch)
742 .equ IRQ4_SEL, .-IDT_BASE
743 .word 0 # offset 15:0
744 .word SYS_CODE_SEL # selector 15:0
745 .byte 0 # 0 for interrupt gate
746 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
747 .word 0 # offset 31:16
749 # IRQ 5 (LPT 2) - (INT 6dh)
750 .equ IRQ5_SEL, .-IDT_BASE
751 .word 0 # offset 15:0
752 .word SYS_CODE_SEL # selector 15:0
753 .byte 0 # 0 for interrupt gate
754 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
755 .word 0 # offset 31:16
757 # IRQ 6 (Floppy controller) - (INT 6eh)
758 .equ IRQ6_SEL, .-IDT_BASE
759 .word 0 # offset 15:0
760 .word SYS_CODE_SEL # selector 15:0
761 .byte 0 # 0 for interrupt gate
762 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
763 .word 0 # offset 31:16
765 # IRQ 7 (LPT 1) - (INT 6fh)
766 .equ IRQ7_SEL, .-IDT_BASE
767 .word 0 # offset 15:0
768 .word SYS_CODE_SEL # selector 15:0
769 .byte 0 # 0 for interrupt gate
770 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
771 .word 0 # offset 31:16
773 # IRQ 8 (RTC Alarm) - (INT 70h)
774 .equ IRQ8_SEL, .-IDT_BASE
775 .word 0 # offset 15:0
776 .word SYS_CODE_SEL # selector 15:0
777 .byte 0 # 0 for interrupt gate
778 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
779 .word 0 # offset 31:16
782 .equ IRQ9_SEL, .-IDT_BASE
783 .word 0 # offset 15:0
784 .word SYS_CODE_SEL # selector 15:0
785 .byte 0 # 0 for interrupt gate
786 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
787 .word 0 # offset 31:16
790 .equ IRQ10_SEL, .-IDT_BASE
791 .word 0 # offset 15:0
792 .word SYS_CODE_SEL # selector 15:0
793 .byte 0 # 0 for interrupt gate
794 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
795 .word 0 # offset 31:16
798 .equ IRQ11_SEL, .-IDT_BASE
799 .word 0 # offset 15:0
800 .word SYS_CODE_SEL # selector 15:0
801 .byte 0 # 0 for interrupt gate
802 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
803 .word 0 # offset 31:16
805 # IRQ 12 (PS/2 mouse) - (INT 74h)
806 .equ IRQ12_SEL, .-IDT_BASE
807 .word 0 # offset 15:0
808 .word SYS_CODE_SEL # selector 15:0
809 .byte 0 # 0 for interrupt gate
810 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
811 .word 0 # offset 31:16
813 # IRQ 13 (Floating point error) - (INT 75h)
814 .equ IRQ13_SEL, .-IDT_BASE
815 .word 0 # offset 15:0
816 .word SYS_CODE_SEL # selector 15:0
817 .byte 0 # 0 for interrupt gate
818 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
819 .word 0 # offset 31:16
821 # IRQ 14 (Secondary IDE) - (INT 76h)
822 .equ IRQ14_SEL, .-IDT_BASE
823 .word 0 # offset 15:0
824 .word SYS_CODE_SEL # selector 15:0
825 .byte 0 # 0 for interrupt gate
826 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
827 .word 0 # offset 31:16
829 # IRQ 15 (Primary IDE) - (INT 77h)
830 .equ IRQ15_SEL, .-IDT_BASE
831 .word 0 # offset 15:0
832 .word SYS_CODE_SEL # selector 15:0
833 .byte 0 # 0 for interrupt gate
834 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
835 .word 0 # offset 31:16
841 MemoryMapSize: .long 0
842 MemoryMap: .long 0,0,0,0,0,0,0,0
843 .long 0,0,0,0,0,0,0,0
844 .long 0,0,0,0,0,0,0,0
845 .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
873 .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
874 .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
878 # below is the pieces of the IVT that is used to redirect INT 68h - 6fh
879 # back to INT 08h - 0fh when in real mode... It is 'org'ed to a
880 # known low address (20f00) so it can be set up by PlMapIrqToVect in