1 #------------------------------------------------------------------------------
3 #* Copyright (c) 2006 - 2007, 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
403 # DISABLE INTERRUPTS - Entering Protected Mode
410 # mov byte ptr es:[164],'c'
423 movl $0x008, %eax # Flat data descriptor
424 movl $0x00400000, %ebp # Destination of EFILDR32
425 movl $0x00070000, %ebx # Length of copy
428 # jmp far 0010:00020000
434 Empty8042InputBuffer:
437 outw %ax, $DELAY_PORT # Delay 1us
438 inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port
439 andb $0x2, %al # Check the Input Buffer Full Flag
440 loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS
443 ##############################################################################
445 ##############################################################################
449 gdtr: .word GDT_END - GDT_BASE - 1 # GDT limit
450 .long 0 # (GDT base gets set above)
451 ##############################################################################
452 # global descriptor table (GDT)
453 ##############################################################################
459 .equ NULL_SEL, .-GDT_BASE
464 .byte 0 # limit 19:16, flags
467 # linear data segment descriptor
468 .equ LINEAR_SEL, .-GDT_BASE
469 .word 0xFFFF # limit 0xFFFFF
472 .byte 0x92 # present, ring 0, data, expand-up, writable
473 .byte 0xCF # page-granular, 32-bit
476 # linear code segment descriptor
477 .equ LINEAR_CODE_SEL, .-GDT_BASE
478 .word 0xFFFF # limit 0xFFFFF
481 .byte 0x9A # present, ring 0, data, expand-up, writable
482 .byte 0xCF # page-granular, 32-bit
485 # system data segment descriptor
486 .equ SYS_DATA_SEL, .-GDT_BASE
487 .word 0xFFFF # limit 0xFFFFF
490 .byte 0x92 # present, ring 0, data, expand-up, writable
491 .byte 0xCF # page-granular, 32-bit
494 # system code segment descriptor
495 .equ SYS_CODE_SEL, .-GDT_BASE
496 .word 0xFFFF # limit 0xFFFFF
499 .byte 0x9A # present, ring 0, data, expand-up, writable
500 .byte 0xCF # page-granular, 32-bit
503 # spare segment descriptor
504 .equ SPARE3_SEL, .-GDT_BASE
505 .word 0 # limit 0xFFFFF
508 .byte 0 # present, ring 0, data, expand-up, writable
509 .byte 0 # page-granular, 32-bit
512 # spare segment descriptor
513 .equ SPARE4_SEL, .-GDT_BASE
514 .word 0 # limit 0xFFFFF
517 .byte 0 # present, ring 0, data, expand-up, writable
518 .byte 0 # page-granular, 32-bit
521 # spare segment descriptor
522 .equ SPARE5_SEL, .-GDT_BASE
523 .word 0 # limit 0xFFFFF
526 .byte 0 # present, ring 0, data, expand-up, writable
527 .byte 0 # page-granular, 32-bit
536 idtr: .word IDT_END - IDT_BASE - 1 # IDT limit
537 .long 0 # (IDT base gets set above)
538 ##############################################################################
539 # interrupt descriptor table (IDT)
541 # Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ
542 # mappings. This implementation only uses the system timer and all other
543 # IRQs will remain masked. The descriptors for vectors 33+ are provided
545 ##############################################################################
551 # divide by zero (INT 0)
552 .equ DIV_ZERO_SEL, .-IDT_BASE
553 .word 0 # offset 15:0
554 .word SYS_CODE_SEL # selector 15:0
555 .byte 0 # 0 for interrupt gate
556 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
557 .word 0 # offset 31:16
559 # debug exception (INT 1)
560 .equ DEBUG_EXCEPT_SEL, .-IDT_BASE
561 .word 0 # offset 15:0
562 .word SYS_CODE_SEL # selector 15:0
563 .byte 0 # 0 for interrupt gate
564 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
565 .word 0 # offset 31:16
568 .equ NMI_SEL, .-IDT_BASE
569 .word 0 # offset 15:0
570 .word SYS_CODE_SEL # selector 15:0
571 .byte 0 # 0 for interrupt gate
572 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
573 .word 0 # offset 31:16
575 # soft breakpoint (INT 3)
576 .equ BREAKPOINT_SEL, .-IDT_BASE
577 .word 0 # offset 15:0
578 .word SYS_CODE_SEL # selector 15:0
579 .byte 0 # 0 for interrupt gate
580 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
581 .word 0 # offset 31:16
584 .equ OVERFLOW_SEL, .-IDT_BASE
585 .word 0 # offset 15:0
586 .word SYS_CODE_SEL # selector 15:0
587 .byte 0 # 0 for interrupt gate
588 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
589 .word 0 # offset 31:16
591 # bounds check (INT 5)
592 .equ BOUNDS_CHECK_SEL, .-IDT_BASE
593 .word 0 # offset 15:0
594 .word SYS_CODE_SEL # selector 15:0
595 .byte 0 # 0 for interrupt gate
596 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
597 .word 0 # offset 31:16
599 # invalid opcode (INT 6)
600 .equ INVALID_OPCODE_SEL, .-IDT_BASE
601 .word 0 # offset 15:0
602 .word SYS_CODE_SEL # selector 15:0
603 .byte 0 # 0 for interrupt gate
604 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
605 .word 0 # offset 31:16
607 # device not available (INT 7)
608 .equ DEV_NOT_AVAIL_SEL, .-IDT_BASE
609 .word 0 # offset 15:0
610 .word SYS_CODE_SEL # selector 15:0
611 .byte 0 # 0 for interrupt gate
612 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
613 .word 0 # offset 31:16
615 # double fault (INT 8)
616 .equ DOUBLE_FAULT_SEL, .-IDT_BASE
617 .word 0 # offset 15:0
618 .word SYS_CODE_SEL # selector 15:0
619 .byte 0 # 0 for interrupt gate
620 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
621 .word 0 # offset 31:16
623 # Coprocessor segment overrun - reserved (INT 9)
624 .equ RSVD_INTR_SEL1, .-IDT_BASE
625 .word 0 # offset 15:0
626 .word SYS_CODE_SEL # selector 15:0
627 .byte 0 # 0 for interrupt gate
628 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
629 .word 0 # offset 31:16
631 # invalid TSS (INT 0ah)
632 .equ INVALID_TSS_SEL, .-IDT_BASE
633 .word 0 # offset 15:0
634 .word SYS_CODE_SEL # selector 15:0
635 .byte 0 # 0 for interrupt gate
636 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
637 .word 0 # offset 31:16
639 # segment not present (INT 0bh)
640 .equ SEG_NOT_PRESENT_SEL, .-IDT_BASE
641 .word 0 # offset 15:0
642 .word SYS_CODE_SEL # selector 15:0
643 .byte 0 # 0 for interrupt gate
644 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
645 .word 0 # offset 31:16
647 # stack fault (INT 0ch)
648 .equ STACK_FAULT_SEL, .-IDT_BASE
649 .word 0 # offset 15:0
650 .word SYS_CODE_SEL # selector 15:0
651 .byte 0 # 0 for interrupt gate
652 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
653 .word 0 # offset 31:16
655 # general protection (INT 0dh)
656 .equ GP_FAULT_SEL, .-IDT_BASE
657 .word 0 # offset 15:0
658 .word SYS_CODE_SEL # selector 15:0
659 .byte 0 # 0 for interrupt gate
660 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
661 .word 0 # offset 31:16
663 # page fault (INT 0eh)
664 .equ PAGE_FAULT_SEL, .-IDT_BASE
665 .word 0 # offset 15:0
666 .word SYS_CODE_SEL # selector 15:0
667 .byte 0 # 0 for interrupt gate
668 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
669 .word 0 # offset 31:16
671 # Intel reserved - do not use (INT 0fh)
672 .equ RSVD_INTR_SEL2, .-IDT_BASE
673 .word 0 # offset 15:0
674 .word SYS_CODE_SEL # selector 15:0
675 .byte 0 # 0 for interrupt gate
676 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
677 .word 0 # offset 31:16
679 # floating point error (INT 10h)
680 .equ FLT_POINT_ERR_SEL, .-IDT_BASE
681 .word 0 # offset 15:0
682 .word SYS_CODE_SEL # selector 15:0
683 .byte 0 # 0 for interrupt gate
684 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
685 .word 0 # offset 31:16
687 # alignment check (INT 11h)
688 .equ ALIGNMENT_CHECK_SEL, .-IDT_BASE
689 .word 0 # offset 15:0
690 .word SYS_CODE_SEL # selector 15:0
691 .byte 0 # 0 for interrupt gate
692 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
693 .word 0 # offset 31:16
695 # machine check (INT 12h)
696 .equ MACHINE_CHECK_SEL, .-IDT_BASE
697 .word 0 # offset 15:0
698 .word SYS_CODE_SEL # selector 15:0
699 .byte 0 # 0 for interrupt gate
700 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
701 .word 0 # offset 31:16
703 # SIMD floating-point exception (INT 13h)
704 .equ SIMD_EXCEPTION_SEL, .-IDT_BASE
705 .word 0 # offset 15:0
706 .word SYS_CODE_SEL # selector 15:0
707 .byte 0 # 0 for interrupt gate
708 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
709 .word 0 # offset 31:16
711 # 85 unspecified descriptors, First 12 of them are reserved, the rest are avail
714 # IRQ 0 (System timer) - (INT 68h)
715 .equ IRQ0_SEL, .-IDT_BASE
716 .word 0 # offset 15:0
717 .word SYS_CODE_SEL # selector 15:0
718 .byte 0 # 0 for interrupt gate
719 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
720 .word 0 # offset 31:16
722 # IRQ 1 (8042 Keyboard controller) - (INT 69h)
723 .equ IRQ1_SEL, .-IDT_BASE
724 .word 0 # offset 15:0
725 .word SYS_CODE_SEL # selector 15:0
726 .byte 0 # 0 for interrupt gate
727 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
728 .word 0 # offset 31:16
730 # Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)
731 .equ IRQ2_SEL, .-IDT_BASE
732 .word 0 # offset 15:0
733 .word SYS_CODE_SEL # selector 15:0
734 .byte 0 # 0 for interrupt gate
735 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
736 .word 0 # offset 31:16
738 # IRQ 3 (COM 2) - (INT 6bh)
739 .equ IRQ3_SEL, .-IDT_BASE
740 .word 0 # offset 15:0
741 .word SYS_CODE_SEL # selector 15:0
742 .byte 0 # 0 for interrupt gate
743 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
744 .word 0 # offset 31:16
746 # IRQ 4 (COM 1) - (INT 6ch)
747 .equ IRQ4_SEL, .-IDT_BASE
748 .word 0 # offset 15:0
749 .word SYS_CODE_SEL # selector 15:0
750 .byte 0 # 0 for interrupt gate
751 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
752 .word 0 # offset 31:16
754 # IRQ 5 (LPT 2) - (INT 6dh)
755 .equ IRQ5_SEL, .-IDT_BASE
756 .word 0 # offset 15:0
757 .word SYS_CODE_SEL # selector 15:0
758 .byte 0 # 0 for interrupt gate
759 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
760 .word 0 # offset 31:16
762 # IRQ 6 (Floppy controller) - (INT 6eh)
763 .equ IRQ6_SEL, .-IDT_BASE
764 .word 0 # offset 15:0
765 .word SYS_CODE_SEL # selector 15:0
766 .byte 0 # 0 for interrupt gate
767 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
768 .word 0 # offset 31:16
770 # IRQ 7 (LPT 1) - (INT 6fh)
771 .equ IRQ7_SEL, .-IDT_BASE
772 .word 0 # offset 15:0
773 .word SYS_CODE_SEL # selector 15:0
774 .byte 0 # 0 for interrupt gate
775 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
776 .word 0 # offset 31:16
778 # IRQ 8 (RTC Alarm) - (INT 70h)
779 .equ IRQ8_SEL, .-IDT_BASE
780 .word 0 # offset 15:0
781 .word SYS_CODE_SEL # selector 15:0
782 .byte 0 # 0 for interrupt gate
783 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
784 .word 0 # offset 31:16
787 .equ IRQ9_SEL, .-IDT_BASE
788 .word 0 # offset 15:0
789 .word SYS_CODE_SEL # selector 15:0
790 .byte 0 # 0 for interrupt gate
791 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
792 .word 0 # offset 31:16
795 .equ IRQ10_SEL, .-IDT_BASE
796 .word 0 # offset 15:0
797 .word SYS_CODE_SEL # selector 15:0
798 .byte 0 # 0 for interrupt gate
799 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
800 .word 0 # offset 31:16
803 .equ IRQ11_SEL, .-IDT_BASE
804 .word 0 # offset 15:0
805 .word SYS_CODE_SEL # selector 15:0
806 .byte 0 # 0 for interrupt gate
807 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
808 .word 0 # offset 31:16
810 # IRQ 12 (PS/2 mouse) - (INT 74h)
811 .equ IRQ12_SEL, .-IDT_BASE
812 .word 0 # offset 15:0
813 .word SYS_CODE_SEL # selector 15:0
814 .byte 0 # 0 for interrupt gate
815 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
816 .word 0 # offset 31:16
818 # IRQ 13 (Floating point error) - (INT 75h)
819 .equ IRQ13_SEL, .-IDT_BASE
820 .word 0 # offset 15:0
821 .word SYS_CODE_SEL # selector 15:0
822 .byte 0 # 0 for interrupt gate
823 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
824 .word 0 # offset 31:16
826 # IRQ 14 (Secondary IDE) - (INT 76h)
827 .equ IRQ14_SEL, .-IDT_BASE
828 .word 0 # offset 15:0
829 .word SYS_CODE_SEL # selector 15:0
830 .byte 0 # 0 for interrupt gate
831 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
832 .word 0 # offset 31:16
834 # IRQ 15 (Primary IDE) - (INT 77h)
835 .equ IRQ15_SEL, .-IDT_BASE
836 .word 0 # offset 15:0
837 .word SYS_CODE_SEL # selector 15:0
838 .byte 0 # 0 for interrupt gate
839 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
840 .word 0 # offset 31:16
846 MemoryMapSize: .long 0
847 MemoryMap: .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
875 .long 0,0,0,0,0,0,0,0
876 .long 0,0,0,0,0,0,0,0
878 .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
879 .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
883 # below is the pieces of the IVT that is used to redirect INT 68h - 6fh
884 # back to INT 08h - 0fh when in real mode... It is 'org'ed to a
885 # known low address (20f00) so it can be set up by PlMapIrqToVect in