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
33 jmp BootSectorEntryPoint # JMP inst - 3 bytes
36 OemId: .ascii "INTEL " # OemId - 8 bytes
38 SectorSize: .word 0 # Sector Size - 16 bits
39 SectorsPerCluster: .byte 0 # Sector Per Cluster - 8 bits
40 ReservedSectors: .word 0 # Reserved Sectors - 16 bits
41 NoFats: .byte 0 # Number of FATs - 8 bits
42 RootEntries: .word 0 # Root Entries - 16 bits
43 Sectors: .word 0 # Number of Sectors - 16 bits
44 Media: .byte 0 # Media - 8 bits - ignored
45 SectorsPerFat: .word 0 # Sectors Per FAT - 16 bits
46 SectorsPerTrack: .word 0 # Sectors Per Track - 16 bits - ignored
47 Heads: .word 0 # Heads - 16 bits - ignored
48 HiddenSectors: .long 0 # Hidden Sectors - 32 bits - ignored
49 LargeSectors: .long 0 # Large Sectors - 32 bits
50 PhysicalDrive: .byte 0 # PhysicalDriveNumber - 8 bits - ignored
51 CurrentHead: .byte 0 # Current Head - 8 bits
52 Signature: .byte 0 # Signature - 8 bits - ignored
53 VolId: .ascii " " # Volume Serial Number- 4 bytes
54 FatLabel: .ascii " " # Label - 11 bytes
55 SystemId: .ascii "FAT16 " # SystemId - 8 bytes
60 # ds = 1000, es = 2000 + x (size of first cluster >> 4)
61 # cx = Start Cluster of EfiLdr
62 # dx = Start Cluster of Efivar.bin
64 # Re use the BPB data stored in Boot Sector
69 # 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already
78 # Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl
84 cmpl $0x4000, %ds:2(%di)
101 movw %ax, %es:0 # Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId
102 movw VolId+2(%bp), %ax
107 # cx = Start Cluster of Efildr -> BS.com has filled already
108 # ES:DI = 2000:0, first cluster will be read again
109 xorw %di, %di # di = 0
114 movw %ax, %cs:JumpSegment
125 # ****************************************************************************
129 # CX = Start Cluster of File
130 # ES:DI = Buffer to store file content read from disk
133 # (ES << 4 + DI) = end of file content Buffer
135 # ****************************************************************************
137 # si = NumberOfClusters
139 # dx = CachedFatSectorNumber
140 # ds:0000 = CacheFatSectorBuffer
141 # es:di = Buffer to load file
142 # bx = NextClusterNumber
144 movw $1, %si # NumberOfClusters = 1
145 pushw %cx # Push Start Cluster onto stack
146 movw $0xfff, %dx # CachedFatSectorNumber = 0xfff
148 movw %cx, %ax # ax = ClusterNumber
149 andw $0xfff8, %ax # ax = ax & 0xfff8
150 cmpw $0xfff8, %ax # See if this is the last cluster
151 je FoundLastCluster # Jump if last cluster found
152 movw %cx, %ax # ax = ClusterNumber
153 shlw %ax # FatOffset = ClusterNumber * 2
155 movw %ax, %si # si = FatOffset
156 shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT
157 addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)
158 andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK
159 cmpw %dx, %ax # Compare FatSectorNumber to CachedFatSectorNumber
165 call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI
167 movw %ax, %dx # CachedFatSectorNumber = FatSectorNumber
169 movw (%si), %bx # bx = NextClusterNumber
170 movw %cx, %ax # ax = ClusterNumber
171 popw %si # Restore si
172 decw %bx # bx = NextClusterNumber - 1
173 cmpw %cx, %bx # See if (NextClusterNumber-1)==ClusterNumber
175 incw %bx # bx = NextClusterNumber
176 incw %si # NumberOfClusters++
177 movw %bx, %cx # ClusterNumber = NextClusterNumber
181 popw %ax # ax = StartCluster
182 pushw %bx # StartCluster = NextClusterNumber
183 movw %bx, %cx # ClusterNumber = NextClusterNumber
184 subw $2, %ax # ax = StartCluster - 2
186 movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster
187 mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster
188 addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster
189 pushw %ax # save start sector
190 movw %si, %ax # ax = NumberOfClusters
191 mulw %bx # ax = NumberOfClusters * SectorsPerCluster
192 movw %ax, %bx # bx = Number of Sectors
193 popw %ax # ax = Start Sector
195 movw $1, %si # NumberOfClusters = 1
203 # ****************************************************************************
204 # ReadBlocks - Reads a set of blocks from a block device
207 # BX = Number of Blocks to Read
208 # ES:DI = Buffer to store sectors read from disk
209 # ****************************************************************************
212 # bx = NumberOfBlocks
217 addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA
218 addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA
219 movl %eax, %esi # esi = Start LBA
220 movw %bx, %cx # cx = Number of blocks to read
222 movw $0x7bfc, %bp # bp = 0x7bfc
223 movl %esi, %eax # eax = Start LBA
224 xorl %edx, %edx # edx = 0
225 movzwl (%bp), %ebx # bx = MaxSector
226 divl %ebx # ax = StartLBA / MaxSector
227 incw %dx # dx = (StartLBA % MaxSector) + 1
229 movw (%bp), %bx # bx = MaxSector
230 subw %dx, %bx # bx = MaxSector - Sector
231 incw %bx # bx = MaxSector - Sector + 1
232 cmpw %bx, %cx # Compare (Blocks) to (MaxSector - Sector + 1)
234 movw %cx, %bx # bx = Blocks
237 movw %es, %ax # ax = es
238 shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system
239 andw $0x7f, %ax # ax = Number of blocks into current seg
240 addw %bx, %ax # ax = End Block number of transfer
241 cmpw $0x80, %ax # See if it crosses a 64K boundry
242 jle NotCrossing64KBoundry # Branch if not crossing 64K boundry
243 subw $0x80, %ax # ax = Number of blocks past 64K boundry
244 subw %ax, %bx # Decrease transfer size by block overage
245 NotCrossing64KBoundry:
246 popw %ax # restore ax
249 movb %dl, %cl # cl = (StartLBA % MaxSector) + 1 = Sector
250 xorw %dx, %dx # dx = 0
251 divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder
252 # dx = ax % (MaxHead + 1) = Head
254 pushw %bx # Save number of blocks to transfer
255 movb %dl, %dh # dh = Head
256 movw $0x7c00, %bp # bp = 0x7c00
257 movb PhysicalDrive(%bp), %dl # dl = Drive Number
258 movb %al, %ch # ch = Cylinder
259 movb %bl, %al # al = Blocks
260 movb $2, %ah # ah = Function 2
261 movw %di, %bx # es:bx = Buffer address
267 addl %ebx, %esi # StartLBA = StartLBA + NumberOfBlocks
268 subw %bx, %cx # Blocks = Blocks - NumberOfBlocks
270 shlw $(BLOCK_SHIFT-4), %bx
272 movw %ax, %es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE
281 leaw ErrorString, %si
283 jmp PrintStringAndHalt
295 .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!', 0x0c
297 # .org 0x01fa # Just for passing build.
298 LBAOffsetForBootSector:
301 # .org 0x01fe # Just for passing build.
304 #******************************************************************************
305 #******************************************************************************
306 #******************************************************************************
308 .equ DELAY_PORT, 0x0ed # Port to use for 1uS delay
309 .equ KBD_CONTROL_PORT, 0x060 # 8042 control port
310 .equ KBD_STATUS_PORT, 0x064 # 8042 status port
311 .equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port
312 .equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20
314 # .org 0x0200 # Just for passing build.
317 .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
328 # mov byte ptr es:[160],'a'
337 movl $0x534d4150, %edx # 0x534d4150 stands for 'SMAP'
346 subl %eax, %edi # Get the address of the memory map
347 movl %edi, MemoryMapSize # Save the size of the memory map
350 movw %cs, %bx # BX=segment
351 shll $4, %ebx # BX="linear" address of segment base
352 leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt
353 movl %eax, gdtr + 2 # Put address of gdt into the gdtr
354 leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt
355 movl %eax, idtr + 2 # Put address of idt into the idtr
356 leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map
358 addl $0x1000, %ebx # Source of EFI32
361 movl %ebx, %esi # Source of EFILDR32
365 # mov byte ptr es:[162],'b'
373 movw $0x2401, %ax # Enable A20 Gate
375 jnc A20GateEnabled # Jump if it suceeded
378 # If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.
381 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
382 jnz Timeout8042 # Jump if the 8042 timed out
383 outw %ax, $DELAY_PORT # Delay 1 uS
384 movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port
385 outb %al, $KBD_STATUS_PORT # Send command to the 8042
386 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
387 jnz Timeout8042 # Jump if the 8042 timed out
388 movb $ENABLE_A20_CMD, %al # gate address bit 20 on
389 outb %al, $KBD_CONTROL_PORT # Send command to thre 8042
390 call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
391 movw $25, %cx # Delay 25 uS for the command to complete on the 8042
393 outw %ax, $DELAY_PORT # Delay 1 uS
401 # DISABLE INTERRUPTS - Entering Protected Mode
408 # mov byte ptr es:[164],'c'
421 movl $0x008, %eax # Flat data descriptor
422 movl $0x00400000, %ebp # Destination of EFILDR32
423 movl $0x00070000, %ebx # Length of copy
426 # jmp far 0010:00020000
432 Empty8042InputBuffer:
435 outw %ax, $DELAY_PORT # Delay 1us
436 inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port
437 andb $0x2, %al # Check the Input Buffer Full Flag
438 loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS
441 ##############################################################################
443 ##############################################################################
447 gdtr: .word GDT_END - GDT_BASE - 1 # GDT limit
448 .long 0 # (GDT base gets set above)
449 ##############################################################################
450 # global descriptor table (GDT)
451 ##############################################################################
458 .equ NULL_SEL, .-GDT_BASE
463 .byte 0 # limit 19:16, flags
466 # linear data segment descriptor
467 .equ LINEAR_SEL, .-GDT_BASE
468 .word 0xFFFF # limit 0xFFFFF
471 .byte 0x92 # present, ring 0, data, expand-up, writable
472 .byte 0xCF # page-granular, 32-bit
475 # linear code segment descriptor
476 .equ LINEAR_CODE_SEL, .-GDT_BASE
477 .word 0xFFFF # limit 0xFFFFF
480 .byte 0x9A # present, ring 0, data, expand-up, writable
481 .byte 0xCF # page-granular, 32-bit
484 # system data segment descriptor
485 .equ SYS_DATA_SEL, .-GDT_BASE
486 .word 0xFFFF # limit 0xFFFFF
489 .byte 0x92 # present, ring 0, data, expand-up, writable
490 .byte 0xCF # page-granular, 32-bit
493 # system code segment descriptor
494 .equ SYS_CODE_SEL, .-GDT_BASE
495 .word 0xFFFF # limit 0xFFFFF
498 .byte 0x9A # present, ring 0, data, expand-up, writable
499 .byte 0xCF # page-granular, 32-bit
502 # spare segment descriptor
503 .equ SPARE3_SEL, .-GDT_BASE
504 .word 0 # limit 0xFFFFF
507 .byte 0 # present, ring 0, data, expand-up, writable
508 .byte 0 # page-granular, 32-bit
511 # spare segment descriptor
512 .equ SPARE4_SEL, .-GDT_BASE
513 .word 0 # limit 0xFFFFF
516 .byte 0 # present, ring 0, data, expand-up, writable
517 .byte 0 # page-granular, 32-bit
520 # spare segment descriptor
521 .equ SPARE5_SEL, .-GDT_BASE
522 .word 0 # limit 0xFFFFF
525 .byte 0 # present, ring 0, data, expand-up, writable
526 .byte 0 # page-granular, 32-bit
535 idtr: .word IDT_END - IDT_BASE - 1 # IDT limit
536 .long 0 # (IDT base gets set above)
537 ##############################################################################
538 # interrupt descriptor table (IDT)
540 # Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ
541 # mappings. This implementation only uses the system timer and all other
542 # IRQs will remain masked. The descriptors for vectors 33+ are provided
544 ##############################################################################
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