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 #------------------------------------------------------------------------------
22 .equ FAT_DIRECTORY_ENTRY_SIZE, 0x020
23 .equ FAT_DIRECTORY_ENTRY_SHIFT, 5
24 .equ BLOCK_SIZE, 0x0200
25 .equ BLOCK_MASK, 0x01ff
30 jmp BootSectorEntryPoint # JMP inst - 3 bytes
33 OemId: .ascii "INTEL " # OemId - 8 bytes
35 SectorSize: .word 0 # Sector Size - 16 bits
36 SectorsPerCluster: .byte 0 # Sector Per Cluster - 8 bits
37 ReservedSectors: .word 0 # Reserved Sectors - 16 bits
38 NoFats: .byte 0 # Number of FATs - 8 bits
39 RootEntries: .word 0 # Root Entries - 16 bits
40 Sectors: .word 0 # Number of Sectors - 16 bits
41 Media: .byte 0 # Media - 8 bits - ignored
42 SectorsPerFat: .word 0 # Sectors Per FAT - 16 bits
43 SectorsPerTrack: .word 0 # Sectors Per Track - 16 bits - ignored
44 Heads: .word 0 # Heads - 16 bits - ignored
45 HiddenSectors: .long 0 # Hidden Sectors - 32 bits - ignored
46 LargeSectors: .long 0 # Large Sectors - 32 bits
47 PhysicalDrive: .byte 0 # PhysicalDriveNumber - 8 bits - ignored
48 CurrentHead: .byte 0 # Current Head - 8 bits
49 Signature: .byte 0 # Signature - 8 bits - ignored
50 VolId: .ascii " " # Volume Serial Number- 4 bytes
51 FatLabel: .ascii " " # Label - 11 bytes
52 SystemId: .ascii "FAT12 " # SystemId - 8 bytes
57 # ds = 1000, es = 2000 + x (size of first cluster >> 4)
58 # cx = Start Cluster of EfiLdr
59 # dx = Start Cluster of Efivar.bin
61 # Re use the BPB data stored in Boot Sector
66 # 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already
75 # Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl
81 cmpl $0x4000, %ds:2(%di)
98 movw %ax, %es:(0) # Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId
99 movw VolId+2(%bp), %ax
104 # cx = Start Cluster of Efildr -> BS.com has filled already
105 # ES:DI = 2000:0, first cluster will be read again
106 xorw %di, %di # di = 0
111 movw %ax, %cs:JumpSegment
122 # ****************************************************************************
126 # CX = Start Cluster of File
127 # ES:DI = Buffer to store file content read from disk
130 # (ES << 4 + DI) = end of file content Buffer
132 # ****************************************************************************
134 # si = NumberOfClusters
136 # dx = CachedFatSectorNumber
137 # ds:0000 = CacheFatSectorBuffer
138 # es:di = Buffer to load file
139 # bx = NextClusterNumber
141 movw $1, %si # NumberOfClusters = 1
142 pushw %cx # Push Start Cluster onto stack
143 movw $0xfff, %dx # CachedFatSectorNumber = 0xfff
145 movw %cx, %ax # ax = ClusterNumber
146 andw $0xff8, %ax # ax = ax & 0xff8
147 cmpw $0xff8, %ax # See if this is the last cluster
148 je FoundLastCluster # Jump if last cluster found
149 movw %cx, %ax # ax = ClusterNumber
150 shlw %ax # ax = ClusterNumber * 2
151 addw %cx, %ax # ax = ClusterNumber * 2 + ClusterNumber = ClusterNumber * 3
152 shrw %ax # FatOffset = ClusterNumber*3 / 2
154 movw %ax, %si # si = FatOffset
155 shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT
156 addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)
157 andw $BLOCK_MASK,%si # si = FatOffset & BLOCK_MASK
158 cmpw %dx, %ax # Compare FatSectorNumber to CachedFatSectorNumber
164 call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI
166 movw %ax, %dx # CachedFatSectorNumber = FatSectorNumber
168 movw (%si), %bx # bx = NextClusterNumber
169 movw %cx, %ax # ax = ClusterNumber
170 andw $1, %ax # See if this is an odd cluster number
172 shrw $4, %bx # NextClusterNumber = NextClusterNumber >> 4
174 andw $0xfff, %bx # Strip upper 4 bits of NextClusterNumber
175 popw %si # Restore si
176 decw %bx # bx = NextClusterNumber - 1
177 cmpw %cx, %bx # See if (NextClusterNumber-1)==ClusterNumber
179 incw %bx # bx = NextClusterNumber
180 incw %si # NumberOfClusters++
181 movw %bx, %cx # ClusterNumber = NextClusterNumber
185 popw %ax # ax = StartCluster
186 pushw %bx # StartCluster = NextClusterNumber
187 movw %bx, %cx # ClusterNumber = NextClusterNumber
188 subw $2, %ax # ax = StartCluster - 2
190 movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster
191 mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster
192 addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster
193 pushw %ax # save start sector
194 movw %si, %ax # ax = NumberOfClusters
195 mulw %bx # ax = NumberOfClusters * SectorsPerCluster
196 movw %ax, %bx # bx = Number of Sectors
197 popw %ax # ax = Start Sector
199 movw $1, %si # NumberOfClusters = 1
207 # ****************************************************************************
208 # ReadBlocks - Reads a set of blocks from a block device
211 # BX = Number of Blocks to Read
212 # ES:DI = Buffer to store sectors read from disk
213 # ****************************************************************************
216 # bx = NumberOfBlocks
221 addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA
222 addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA
223 movl %eax, %esi # esi = Start LBA
224 movw %bx, %cx # cx = Number of blocks to read
226 movw $0x7bfc, %bp # bp = 0x7bfc
227 movl %esi, %eax # eax = Start LBA
228 xorl %edx, %edx # edx = 0
229 movzwl (%bp), %ebx # bx = MaxSector
230 divl %ebx # ax = StartLBA / MaxSector
231 incw %dx # dx = (StartLBA % MaxSector) + 1
233 movw (%bp), %bx # bx = MaxSector
234 subw %dx, %bx # bx = MaxSector - Sector
235 incw %bx # bx = MaxSector - Sector + 1
236 cmpw %bx, %cx # Compare (Blocks) to (MaxSector - Sector + 1)
238 movw %cx, %bx # bx = Blocks
241 movw %es, %ax # ax = es
242 shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system
243 andw $0x7f, %ax # ax = Number of blocks into current seg
244 addw %bx, %ax # ax = End Block number of transfer
245 cmpw $0x80, %ax # See if it crosses a 64K boundry
246 jle NotCrossing64KBoundry # Branch if not crossing 64K boundry
247 subw $0x80, %ax # ax = Number of blocks past 64K boundry
248 subw %ax, %bx # Decrease transfer size by block overage
249 NotCrossing64KBoundry:
250 popw %ax # restore ax
253 movb %dl, %cl # cl = (StartLBA % MaxSector) + 1 = Sector
254 xorw %dx, %dx # dx = 0
255 divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder
256 # dx = ax % (MaxHead + 1) = Head
258 pushw %bx # Save number of blocks to transfer
259 movb %dl, %dh # dh = Head
260 movw $0x7c00, %bp # bp = 0x7c00
261 movb PhysicalDrive(%bp), %dl # dl = Drive Number
262 movb %al, %ch # ch = Cylinder
263 movb %bl, %al # al = Blocks
264 movb $2, %ah # ah = Function 2
265 movw %di, %bx # es:bx = Buffer address
271 addl %ebx, %esi # StartLBA = StartLBA + NumberOfBlocks
272 subw %bx, %cx # Blocks = Blocks - NumberOfBlocks
274 shlw $(BLOCK_SHIFT-4), %bx
276 movw %ax, %es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE
285 leaw ErrorString, %si
287 jmp PrintStringAndHalt
299 .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c
302 LBAOffsetForBootSector:
308 #******************************************************************************
309 #******************************************************************************
310 #******************************************************************************
312 .equ DELAY_PORT, 0x0ed # Port to use for 1uS delay
313 .equ KBD_CONTROL_PORT, 0x060 # 8042 control port
314 .equ KBD_STATUS_PORT, 0x064 # 8042 status port
315 .equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port
316 .equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20
321 .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
332 # mov byte ptr es:[160],'a'
341 movl $0x534d4150, %edx # SMAP
350 subl %eax, %edi # Get the address of the memory map
351 movl %edi, MemoryMapSize # Save the size of the memory map
354 movw %cs, %bx # BX=segment
355 shll $4, %ebx # BX="linear" address of segment base
356 leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt
357 movl %eax, (gdtr + 2) # Put address of gdt into the gdtr
358 leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt
359 movl %eax, (idtr + 2) # Put address of idt into the idtr
360 leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map
362 addl $0x1000, %ebx # Source of EFI32
365 movl %ebx, %esi # Source of EFILDR32
369 # mov byte ptr es:[162],'b'
377 movw $0x2401, %ax # Enable A20 Gate
379 jnc A20GateEnabled # Jump if it suceeded
382 # If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.
385 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
386 jnz Timeout8042 # Jump if the 8042 timed out
387 outw %ax, $DELAY_PORT # Delay 1 uS
388 mov $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port
389 out %al, $KBD_STATUS_PORT # Send command to the 8042
390 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
391 jnz Timeout8042 # Jump if the 8042 timed out
392 mov $ENABLE_A20_CMD, %al # gate address bit 20 on
393 out %al, $KBD_CONTROL_PORT # Send command to thre 8042
394 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
395 movw $25, %cx # Delay 25 uS for the command to complete on the 8042
397 outw %ax, $DELAY_PORT # Delay 1 uS
405 # DISABLE INTERRUPTS - Entering Protected Mode
412 # mov byte ptr es:[164],'c'
425 movl $0x008, %eax # Flat data descriptor
426 movl $0x00400000, %ebp # Destination of EFILDR32
427 movl $0x00070000, %ebx # Length of copy
430 # jmp far 0010:00020000
436 Empty8042InputBuffer:
439 outw %ax, $DELAY_PORT # Delay 1us
440 in $KBD_STATUS_PORT, %al # Read the 8042 Status Port
441 andb $0x2, %al # Check the Input Buffer Full Flag
442 loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS
445 ##############################################################################
447 ##############################################################################
451 gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit
452 .long 0 # (GDT base gets set above)
453 ##############################################################################
454 # global descriptor table (GDT)
455 ##############################################################################
461 .equ NULL_SEL, .-GDT_BASE
466 .byte 0 # limit 19:16, flags
469 # linear data segment descriptor
470 .equ LINEAR_SEL, .-GDT_BASE
471 .word 0xFFFF # limit 0xFFFFF
474 .byte 0x92 # present, ring 0, data, expand-up, writable
475 .byte 0xCF # page-granular, 32-bit
478 # linear code segment descriptor
479 .equ LINEAR_CODE_SEL, .-GDT_BASE
480 .word 0xFFFF # limit 0xFFFFF
483 .byte 0x9A # present, ring 0, data, expand-up, writable
484 .byte 0xCF # page-granular, 32-bit
487 # system data segment descriptor
488 .equ SYS_DATA_SEL, .-GDT_BASE
489 .word 0xFFFF # limit 0xFFFFF
492 .byte 0x92 # present, ring 0, data, expand-up, writable
493 .byte 0xCF # page-granular, 32-bit
496 # system code segment descriptor
497 .equ SYS_CODE_SEL, .-GDT_BASE
498 .word 0xFFFF # limit 0xFFFFF
501 .byte 0x9A # present, ring 0, data, expand-up, writable
502 .byte 0xCF # page-granular, 32-bit
505 # spare segment descriptor
506 .equ SPARE3_SEL, .-GDT_BASE
507 .word 0 # limit 0xFFFFF
510 .byte 0 # present, ring 0, data, expand-up, writable
511 .byte 0 # page-granular, 32-bit
514 # spare segment descriptor
515 .equ SPARE4_SEL, .-GDT_BASE
516 .word 0 # limit 0xFFFFF
519 .byte 0 # present, ring 0, data, expand-up, writable
520 .byte 0 # page-granular, 32-bit
523 # spare segment descriptor
524 .equ SPARE5_SEL, .-GDT_BASE
525 .word 0 # limit 0xFFFFF
528 .byte 0 # present, ring 0, data, expand-up, writable
529 .byte 0 # page-granular, 32-bit
538 idtr: .long IDT_END - IDT_BASE - 1 # IDT limit
539 .long 0 # (IDT base gets set above)
540 ##############################################################################
541 # interrupt descriptor table (IDT)
543 # Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ
544 # mappings. This implementation only uses the system timer and all other
545 # IRQs will remain masked. The descriptors for vectors 33+ are provided
547 ##############################################################################
553 # divide by zero (INT 0)
554 .equ DIV_ZERO_SEL, .-IDT_BASE
555 .word 0 # offset 15:0
556 .long SYS_CODE_SEL # selector 15:0
557 .byte 0 # 0 for interrupt gate
558 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
559 .word 0 # offset 31:16
561 # debug exception (INT 1)
562 .equ DEBUG_EXCEPT_SEL, .-IDT_BASE
563 .word 0 # offset 15:0
564 .long SYS_CODE_SEL # selector 15:0
565 .byte 0 # 0 for interrupt gate
566 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
567 .word 0 # offset 31:16
570 .equ NMI_SEL, .-IDT_BASE
571 .word 0 # offset 15:0
572 .long SYS_CODE_SEL # selector 15:0
573 .byte 0 # 0 for interrupt gate
574 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
575 .word 0 # offset 31:16
577 # soft breakpoint (INT 3)
578 .equ BREAKPOINT_SEL, .-IDT_BASE
579 .word 0 # offset 15:0
580 .long SYS_CODE_SEL # selector 15:0
581 .byte 0 # 0 for interrupt gate
582 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
583 .word 0 # offset 31:16
586 .equ OVERFLOW_SEL, .-IDT_BASE
587 .word 0 # offset 15:0
588 .long SYS_CODE_SEL # selector 15:0
589 .byte 0 # 0 for interrupt gate
590 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
591 .word 0 # offset 31:16
593 # bounds check (INT 5)
594 .equ BOUNDS_CHECK_SEL, .-IDT_BASE
595 .word 0 # offset 15:0
596 .long SYS_CODE_SEL # selector 15:0
597 .byte 0 # 0 for interrupt gate
598 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
599 .word 0 # offset 31:16
601 # invalid opcode (INT 6)
602 .equ INVALID_OPCODE_SEL, .-IDT_BASE
603 .word 0 # offset 15:0
604 .long SYS_CODE_SEL # selector 15:0
605 .byte 0 # 0 for interrupt gate
606 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
607 .word 0 # offset 31:16
609 # device not available (INT 7)
610 .equ DEV_NOT_AVAIL_SEL, .-IDT_BASE
611 .word 0 # offset 15:0
612 .long SYS_CODE_SEL # selector 15:0
613 .byte 0 # 0 for interrupt gate
614 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
615 .word 0 # offset 31:16
617 # double fault (INT 8)
618 .equ DOUBLE_FAULT_SEL, .-IDT_BASE
619 .word 0 # offset 15:0
620 .long SYS_CODE_SEL # selector 15:0
621 .byte 0 # 0 for interrupt gate
622 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
623 .word 0 # offset 31:16
625 # Coprocessor segment overrun - reserved (INT 9)
626 .equ RSVD_INTR_SEL1, .-IDT_BASE
627 .word 0 # offset 15:0
628 .long SYS_CODE_SEL # selector 15:0
629 .byte 0 # 0 for interrupt gate
630 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
631 .word 0 # offset 31:16
633 # invalid TSS (INT 0x0a)
634 .equ INVALID_TSS_SEL, .-IDT_BASE
635 .word 0 # offset 15:0
636 .long SYS_CODE_SEL # selector 15:0
637 .byte 0 # 0 for interrupt gate
638 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
639 .word 0 # offset 31:16
641 # segment not present (INT 0x0b)
642 .equ SEG_NOT_PRESENT_SEL, .-IDT_BASE
643 .word 0 # offset 15:0
644 .long SYS_CODE_SEL # selector 15:0
645 .byte 0 # 0 for interrupt gate
646 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
647 .word 0 # offset 31:16
649 # stack fault (INT 0x0c)
650 .equ STACK_FAULT_SEL, .-IDT_BASE
651 .word 0 # offset 15:0
652 .long SYS_CODE_SEL # selector 15:0
653 .byte 0 # 0 for interrupt gate
654 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
655 .word 0 # offset 31:16
657 # general protection (INT 0x0d)
658 .equ GP_FAULT_SEL, .-IDT_BASE
659 .word 0 # offset 15:0
660 .long SYS_CODE_SEL # selector 15:0
661 .byte 0 # 0 for interrupt gate
662 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
663 .word 0 # offset 31:16
665 # page fault (INT 0x0e)
666 .equ PAGE_FAULT_SEL, .-IDT_BASE
667 .word 0 # offset 15:0
668 .long SYS_CODE_SEL # selector 15:0
669 .byte 0 # 0 for interrupt gate
670 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
671 .word 0 # offset 31:16
673 # Intel reserved - do not use (INT 0x0f)
674 .equ RSVD_INTR_SEL2, .-IDT_BASE
675 .word 0 # offset 15:0
676 .long SYS_CODE_SEL # selector 15:0
677 .byte 0 # 0 for interrupt gate
678 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
679 .word 0 # offset 31:16
681 # floating point error (INT 0x10)
682 .equ FLT_POINT_ERR_SEL, .-IDT_BASE
683 .word 0 # offset 15:0
684 .long SYS_CODE_SEL # selector 15:0
685 .byte 0 # 0 for interrupt gate
686 .byte 0x0e | 0x80 # type = 386 interrupt gate, present
687 .word 0 # offset 31:16
689 # alignment check (INT 0x11)
690 .equ ALIGNMENT_CHECK_SEL, .-IDT_BASE
691 .word 0 # offset 15:0
692 .long SYS_CODE_SEL # selector 15:0
693 .byte 0 # 0 for interrupt gate
694 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
695 .word 0 # offset 31:16
697 # machine check (INT 0x12)
698 .equ MACHINE_CHECK_SEL, .-IDT_BASE
699 .word 0 # offset 15:0
700 .long SYS_CODE_SEL # selector 15:0
701 .byte 0 # 0 for interrupt gate
702 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
703 .word 0 # offset 31:16
705 # SIMD floating-point exception (INT 0x13)
706 .equ SIMD_EXCEPTION_SEL, .-IDT_BASE
707 .word 0 # offset 15:0
708 .long SYS_CODE_SEL # selector 15:0
709 .byte 0 # 0 for interrupt gate
710 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
711 .word 0 # offset 31:16
713 # 85 unspecified descriptors, First 12 of them are reserved, the rest are avail
714 .fill 85 * 8, 1, 0 # db (85 * 8) dup(0)
716 # IRQ 0 (System timer) - (INT 0x68)
717 .equ IRQ0_SEL, .-IDT_BASE
718 .word 0 # offset 15:0
719 .long SYS_CODE_SEL # selector 15:0
720 .byte 0 # 0 for interrupt gate
721 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
722 .word 0 # offset 31:16
724 # IRQ 1 (8042 Keyboard controller) - (INT 0x69)
725 .equ IRQ1_SEL, .-IDT_BASE
726 .word 0 # offset 15:0
727 .long SYS_CODE_SEL # selector 15:0
728 .byte 0 # 0 for interrupt gate
729 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
730 .word 0 # offset 31:16
732 # Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 0x6a)
733 .equ IRQ2_SEL, .-IDT_BASE
734 .word 0 # offset 15:0
735 .long SYS_CODE_SEL # selector 15:0
736 .byte 0 # 0 for interrupt gate
737 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
738 .word 0 # offset 31:16
740 # IRQ 3 (COM 2) - (INT 0x6b)
741 .equ IRQ3_SEL, .-IDT_BASE
742 .word 0 # offset 15:0
743 .long SYS_CODE_SEL # selector 15:0
744 .byte 0 # 0 for interrupt gate
745 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
746 .word 0 # offset 31:16
748 # IRQ 4 (COM 1) - (INT 0x6c)
749 .equ IRQ4_SEL, .-IDT_BASE
750 .word 0 # offset 15:0
751 .long SYS_CODE_SEL # selector 15:0
752 .byte 0 # 0 for interrupt gate
753 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
754 .word 0 # offset 31:16
756 # IRQ 5 (LPT 2) - (INT 0x6d)
757 .equ IRQ5_SEL, .-IDT_BASE
758 .word 0 # offset 15:0
759 .long SYS_CODE_SEL # selector 15:0
760 .byte 0 # 0 for interrupt gate
761 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
762 .word 0 # offset 31:16
764 # IRQ 6 (Floppy controller) - (INT 0x6e)
765 .equ IRQ6_SEL, .-IDT_BASE
766 .word 0 # offset 15:0
767 .long SYS_CODE_SEL # selector 15:0
768 .byte 0 # 0 for interrupt gate
769 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
770 .word 0 # offset 31:16
772 # IRQ 7 (LPT 1) - (INT 0x6f)
773 .equ IRQ7_SEL, .-IDT_BASE
774 .word 0 # offset 15:0
775 .long SYS_CODE_SEL # selector 15:0
776 .byte 0 # 0 for interrupt gate
777 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
778 .word 0 # offset 31:16
780 # IRQ 8 (RTC Alarm) - (INT 0x70)
781 .equ IRQ8_SEL, .-IDT_BASE
782 .word 0 # offset 15:0
783 .long SYS_CODE_SEL # selector 15:0
784 .byte 0 # 0 for interrupt gate
785 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
786 .word 0 # offset 31:16
789 .equ IRQ9_SEL, .-IDT_BASE
790 .word 0 # offset 15:0
791 .long SYS_CODE_SEL # selector 15:0
792 .byte 0 # 0 for interrupt gate
793 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
794 .word 0 # offset 31:16
796 # IRQ 10 - (INT 0x72)
797 .equ IRQ10_SEL, .-IDT_BASE
798 .word 0 # offset 15:0
799 .long SYS_CODE_SEL # selector 15:0
800 .byte 0 # 0 for interrupt gate
801 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
802 .word 0 # offset 31:16
804 # IRQ 11 - (INT 0x73)
805 .equ IRQ11_SEL, .-IDT_BASE
806 .word 0 # offset 15:0
807 .long SYS_CODE_SEL # selector 15:0
808 .byte 0 # 0 for interrupt gate
809 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
810 .word 0 # offset 31:16
812 # IRQ 12 (PS/2 mouse) - (INT 0x74)
813 .equ IRQ12_SEL, .-IDT_BASE
814 .word 0 # offset 15:0
815 .long SYS_CODE_SEL # selector 15:0
816 .byte 0 # 0 for interrupt gate
817 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
818 .word 0 # offset 31:16
820 # IRQ 13 (Floating point error) - (INT 0x75)
821 .equ IRQ13_SEL, .-IDT_BASE
822 .word 0 # offset 15:0
823 .long SYS_CODE_SEL # selector 15:0
824 .byte 0 # 0 for interrupt gate
825 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
826 .word 0 # offset 31:16
828 # IRQ 14 (Secondary IDE) - (INT 0x76)
829 .equ IRQ14_SEL, .-IDT_BASE
830 .word 0 # offset 15:0
831 .long SYS_CODE_SEL # selector 15:0
832 .byte 0 # 0 for interrupt gate
833 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
834 .word 0 # offset 31:16
836 # IRQ 15 (Primary IDE) - (INT 0x77)
837 .equ IRQ15_SEL, .-IDT_BASE
838 .word 0 # offset 15:0
839 .long SYS_CODE_SEL # selector 15:0
840 .byte 0 # 0 for interrupt gate
841 .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
842 .word 0 # offset 31:16
848 MemoryMapSize: .long 0
849 MemoryMap: .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
877 .long 0,0,0,0,0,0,0,0
878 .long 0,0,0,0,0,0,0,0
880 .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 .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
885 # below is the pieces of the IVT that is used to redirect INT 68h - 6fh
886 # back to INT 08h - 0fh when in real mode... It is 'org'ed to a
887 # known low address (20f00) so it can be set up by PlMapIrqToVect in