diff options
| author | gikidy <gikidy@6f19259b-4bc3-4df7-8a09-765794883524> | 2009-02-20 08:03:44 +0000 |
|---|---|---|
| committer | gikidy <gikidy@6f19259b-4bc3-4df7-8a09-765794883524> | 2009-02-20 08:03:44 +0000 |
| commit | 5ffcd2579f945ffd14b410947f330f5e50ac7658 (patch) | |
| tree | 68ca0449eaba1e7eef193810b9f7267f9a20718a /DuetPkg/CpuDxe | |
| parent | 166451c51cb3c05d1a604a9eda009e81f0833cbc (diff) | |
| download | edk2-5ffcd2579f945ffd14b410947f330f5e50ac7658.zip edk2-5ffcd2579f945ffd14b410947f330f5e50ac7658.tar.gz edk2-5ffcd2579f945ffd14b410947f330f5e50ac7658.tar.bz2 | |
Patch for CpuInterrupt.S from Tristan Gingold.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7555 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'DuetPkg/CpuDxe')
| -rw-r--r-- | DuetPkg/CpuDxe/Ia32/CpuInterrupt.S | 1198 |
1 files changed, 657 insertions, 541 deletions
diff --git a/DuetPkg/CpuDxe/Ia32/CpuInterrupt.S b/DuetPkg/CpuDxe/Ia32/CpuInterrupt.S index 120669a..64ad89f 100644 --- a/DuetPkg/CpuDxe/Ia32/CpuInterrupt.S +++ b/DuetPkg/CpuDxe/Ia32/CpuInterrupt.S @@ -1,167 +1,216 @@ -/** @file
- *
- * Copyright 2006, Intel Corporation
- * All rights reserved. This program and the accompanying materials
- * are licensed and made available under the terms and conditions of the BSD License
- * which accompanies this distribution. The full text of the license may be found at
- * http://opensource.org/licenses/bsd-license.php
- *
- * THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
- * WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
- *
- * CpuInterrupt.S
- *
- * Abstract:
- *
- **/
-
-.globl ASM_PFX(SystemTimerHandler)
-.globl ASM_PFX(SystemExceptionHandler)
-.globl ASM_PFX(mExceptionCodeSize)
-.globl ASM_PFX(InitDescriptor)
-.globl ASM_PFX(InstallInterruptHandler)
-
-ASM_PFX(mExceptionCodeSize): .long 9
-
-/**
- * VOID
- * InitDescriptor (
- * VOID
- * )
- **/
+#------------------------------------------------------------------------------
+#*
+#* Copyright 2006, Intel Corporation
+#* All rights reserved. This program and the accompanying materials
+#* are licensed and made available under the terms and conditions of the BSD License
+#* which accompanies this distribution. The full text of the license may be found at
+#* http://opensource.org/licenses/bsd-license.php
+#*
+#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#*
+#* CpuInterrupt.S
+#*
+#* Abstract:
+#*
+#------------------------------------------------------------------------------
+
+#PUBLIC SystemTimerHandler
+#PUBLIC SystemExceptionHandler
+#EXTERNDEF mExceptionCodeSize:DWORD
+
+#EXTERN TimerHandler: NEAR
+#EXTERN ExceptionHandler: NEAR
+#EXTERN mTimerVector: DWORD
+
+ .data
+ .globl ASM_PFX(mExceptionCodeSize)
+ASM_PFX(mExceptionCodeSize): .long 9
+
+ .text
+ .globl ASM_PFX(InitDescriptor)
+
ASM_PFX(InitDescriptor):
+ movl $GDT_BASE,%eax # EAX=PHYSICAL address of gdt
+ movl %eax, gdtr + 2 # Put address of gdt into the gdtr
lgdt gdtr
+ movl $IDT_BASE,%eax # EAX=PHYSICAL address of idt
+ movl %eax, idtr + 2 # Put address of idt into the idtr
lidt idtr
ret
-/**
- * VOID
- * InstallInterruptHandler (
- * UINTN Vector,
- * VOID (*Handler)(VOID)
- * )
- **/
+# VOID
+# InstallInterruptHandler (
+# UINTN Vector,
+# VOID (*Handler)(VOID)
+# )
+ .globl ASM_PFX(InstallInterruptHandler)
ASM_PFX(InstallInterruptHandler):
- movl %esp, %ebp
- pushl %edi
- pushfl # save eflags
+# Vector:DWORD @ 4(%esp)
+# Handler:DWORD @ 8(%esp)
+
+ push %edi
+ pushf # save eflags
cli # turn off interrupts
- subl $6, %esp # open some space on the stack
- movl %esp, %edi
- sidt %es:(%edi) # get fword address of IDT
- movl %es:2(%edi), %edi # move offset of IDT into EDI
- addl $6, %esp # correct stack
- mov 4(%ebp), %eax # Get vector number
- shll $3, %eax # multiply by 8 to get offset
- addl %eax, %edi # add to IDT base to get entry
- movl 8(%ebp), %eax # load new address into IDT entry
- movw %ax, %es:(%edi) # write bits 15..0 of offset
- shrl $16, %eax # use ax to copy 31..16 to descriptors
- movw %ax, %es:6(%edi) # write bits 31..16 of offset
- popfl # restore flags (possible enabling interrupts)
+ subl $6,%esp # open some space on the stack
+ movl %esp,%edi
+ sidt (%edi) # get fword address of IDT
+ movl 2(%edi), %edi # move offset of IDT into EDI
+ addl $6,%esp # correct stack
+ movl 12(%esp),%eax # Get vector number
+ shl $3,%eax # multiply by 8 to get offset
+ addl %eax,%edi # add to IDT base to get entry
+ movl 16(%esp),%eax # load new address into IDT entry
+ movw %ax,(%edi) # write bits 15..0 of offset
+ shrl $16,%eax # use ax to copy 31..16 to descriptors
+ movw %ax,6(%edi) # write bits 31..16 of offset
+ popf # restore flags (possible enabling interrupts)
pop %edi
ret
-.macro JmpCommonIdtEntry errno, vector
- /* jmp commonIdtEntry - this must be hand coded to keep the assembler from
- * using a 8 bit reletive jump when the entries are
- * within 255 bytes of the common entry. This must
- * be done to maintain the consistency of the size
- * of entry points...
- */
- pushl \errno
- pushl \vector
- #.byte 0e9h # jmp 16 bit reletive
- #.long commonIdtEntry - $ - $4 # offset to jump to
- jmpl *commonIdtEntry
-.endm
-
-.align 0x02
+ .macro JmpCommonIdtEntry
+ # jmp commonIdtEntry - this must be hand coded to keep the assembler from
+ # using a 8 bit reletive jump when the entries are
+ # within 255 bytes of the common entry. This must
+ # be done to maintain the consistency of the size
+ # of entry points...
+ .byte 0xe9 # jmp 16 bit reletive
+ .long commonIdtEntry - . - 4 # offset to jump to
+ .endm
+
+ .align 2
+ .globl ASM_PFX(SystemExceptionHandler)
ASM_PFX(SystemExceptionHandler):
INT0:
- JmpCommonIdtEntry errno=0,vector=0
+ pushl $0x0 # push error code place holder on the stack
+ pushl $0x0
+ JmpCommonIdtEntry
+# db 0e9h # jmp 16 bit reletive
+# dd commonIdtEntry - $ - 4 # offset to jump to
+
INT1:
- JmpCommonIdtEntry errno=0,vector=1
+ pushl $0x0 # push error code place holder on the stack
+ pushl $0x1
+ JmpCommonIdtEntry
+
INT2:
- JmpCommonIdtEntry errno=0,vector=2
+ pushl $0x0 # push error code place holder on the stack
+ pushl $0x2
+ JmpCommonIdtEntry
+
INT3:
- JmpCommonIdtEntry errno=0,vector=3
+ pushl $0x0 # push error code place holder on the stack
+ pushl $0x3
+ JmpCommonIdtEntry
+
INT4:
- JmpCommonIdtEntry errno=0,vector=4
+ pushl $0x0 # push error code place holder on the stack
+ pushl $0x4
+ JmpCommonIdtEntry
+
INT5:
- JmpCommonIdtEntry errno=0,vector=5
+ pushl $0x0 # push error code place holder on the stack
+ pushl $0x5
+ JmpCommonIdtEntry
+
INT6:
- JmpCommonIdtEntry errno=0,vector=6
+ pushl $0x0 # push error code place holder on the stack
+ pushl $0x6
+ JmpCommonIdtEntry
+
INT7:
- JmpCommonIdtEntry errno=0,vector=7
+ pushl $0x0 # push error code place holder on the stack
+ pushl $0x7
+ JmpCommonIdtEntry
+
INT8:
-# Double fault causes an error code to be pushed so no phony pushl necessary
+# Double fault causes an error code to be pushed so no phony push necessary
nop
nop
- pushl $8
- jmpl *commonIdtEntry
+ pushl $0x8
+ JmpCommonIdtEntry
+
INT9:
- JmpCommonIdtEntry errno=0,vector=9
+ pushl $0x0 # push error code place holder on the stack
+ pushl $0x9
+ JmpCommonIdtEntry
+
INT10:
-# Invalid TSS causes an error code to be pushed so no phony pushl necessary
+# Invalid TSS causes an error code to be pushed so no phony push necessary
nop
nop
pushl $10
- jmpl *commonIdtEntry
+ JmpCommonIdtEntry
+
INT11:
-# Segment Not Present causes an error code to be pushed so no phony pushl necessary
+# Segment Not Present causes an error code to be pushed so no phony push necessary
nop
nop
pushl $11
- jmpl *commonIdtEntry
+ JmpCommonIdtEntry
+
INT12:
-# Stack fault causes an error code to be pushed so no phony pushl necessary
+# Stack fault causes an error code to be pushed so no phony push necessary
nop
nop
pushl $12
- jmpl *commonIdtEntry
+ JmpCommonIdtEntry
+
INT13:
-# GP fault causes an error code to be pushed so no phony pushl necessary
+# GP fault causes an error code to be pushed so no phony push necessary
nop
nop
pushl $13
- jmpl *commonIdtEntry
+ JmpCommonIdtEntry
+
INT14:
-# Page fault causes an error code to be pushed so no phony pushl necessary
+# Page fault causes an error code to be pushed so no phony push necessary
nop
nop
pushl $14
- jmpl *commonIdtEntry
+ JmpCommonIdtEntry
+
INT15:
- JmpCommonIdtEntry errno=0,vector=15
+ pushl $0x0 # push error code place holder on the stack
+ pushl $15
+ JmpCommonIdtEntry
+
INT16:
- JmpCommonIdtEntry errno=0,vector=16
+ pushl $0x0 # push error code place holder on the stack
+ pushl $16
+ JmpCommonIdtEntry
+
INT17:
-# Alignment check causes an error code to be pushed so no phony pushl necessary
+# Alignment check causes an error code to be pushed so no phony push necessary
nop
nop
pushl $17
- jmpl *commonIdtEntry
+ JmpCommonIdtEntry
+
INT18:
- JmpCommonIdtEntry errno=0,vector=18
+ pushl $0x0 # push error code place holder on the stack
+ pushl $18
+ JmpCommonIdtEntry
+
INT19:
- JmpCommonIdtEntry errno=0,vector=19
-INTUnknown:
- JmpCommonIdtEntry errno=0,vector=20
- JmpCommonIdtEntry errno=0,vector=21
- JmpCommonIdtEntry errno=0,vector=22
- JmpCommonIdtEntry errno=0,vector=23
- JmpCommonIdtEntry errno=0,vector=24
- JmpCommonIdtEntry errno=0,vector=25
- JmpCommonIdtEntry errno=0,vector=26
- JmpCommonIdtEntry errno=0,vector=27
- JmpCommonIdtEntry errno=0,vector=28
- JmpCommonIdtEntry errno=0,vector=29
- JmpCommonIdtEntry errno=0,vector=30
- JmpCommonIdtEntry errno=0,vector=31
+ pushl $0x0 # push error code place holder on the stack
+ pushl $19
+ JmpCommonIdtEntry
+INTUnknown:
+ .rept (32 - 20)
+ pushl $0x0 # push error code place holder on the stack
+# push xxh # push vector number
+ .byte 0x6a
+ .byte ( . - INTUnknown - 3 ) / 9 + 20 # vector number
+ JmpCommonIdtEntry
+ .endr
+
+ .globl ASM_PFX(SystemTimerHandler)
ASM_PFX(SystemTimerHandler):
- JmpCommonIdtEntry errno=0,vector=ASM_PFX(mTimerVector)
+ pushl $0
+ pushl $mTimerVector
+ JmpCommonIdtEntry
commonIdtEntry:
# +---------------------+
@@ -179,539 +228,606 @@ commonIdtEntry: # +---------------------+ <-- EBP
cli
- pushl %ebp
- movl %esp, %ebp
+ push %ebp
+ movl %esp,%ebp
#
# Align stack to make sure that EFI_FX_SAVE_STATE_IA32 of EFI_SYSTEM_CONTEXT_IA32
# is 16-byte aligned
#
- andl $0xfffffff0, %esp
- subl $12, %esp
+ andl $0xfffffff0,%esp
+ subl $12,%esp
## UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax#
- pushl %eax
- pushl %ecx
- pushl %edx
- pushl %ebx
- leal 24(%ebp), %ecx
- pushl %ecx # ESP
- pushl (%ebp) # EBP
- pushl %esi
- pushl %edi
+ push %eax
+ push %ecx
+ push %edx
+ push %ebx
+ leal 6*4(%ebp),%ecx
+ push %ecx # ESP
+ push (%ebp) # EBP
+ push %esi
+ push %edi
## UINT32 Gs, Fs, Es, Ds, Cs, Ss#
- movl %ss, %eax
- pushl %eax
- movzwl 16(%ebp), %eax
- pushl %eax
- movl %ds, %eax
- pushl %eax
- movl %es, %eax
- pushl %eax
- movl %fs, %eax
- pushl %eax
- movl %gs, %eax
- pushl %eax
+ movw %ss,%ax
+ push %eax
+ movzx 4*4(%ebp),%eax
+ push %eax
+ movw %ds,%ax
+ push %eax
+ movw %es,%ax
+ push %eax
+ movw %fs,%ax
+ push %eax
+ movw %gs,%ax
+ push %eax
## UINT32 Eip#
- pushl 12(%ebp)
+ pushl 3*4(%ebp)
## UINT32 Gdtr[2], Idtr[2]#
- subl $8, %esp
- sidt (%esp)
- subl $8, %esp
- sgdt (%esp)
+ subl $8,%esp
+ sidt (%esp)
+ subl $8,%esp
+ sgdt (%esp)
## UINT32 Ldtr, Tr#
- xorl %eax, %eax
- strw %ax
- pushl %eax
- sldt %ax
- pushl %eax
+ xorl %eax, %eax
+ str %ax
+ push %eax
+ sldt %eax
+ push %eax
## UINT32 EFlags#
- pushl 5*4(%ebp)
+ pushl 5*4(%ebp)
## UINT32 Cr0, Cr1, Cr2, Cr3, Cr4#
- movl %cr4, %eax
- orl $0x208, %eax
- movl %eax, %cr4
- pushl %eax
- movl %cr3, %eax
- pushl %eax
- movl %cr2, %eax
- pushl %eax
- xorl %eax, %eax
- pushl %eax
- movl %cr0, %eax
- pushl %eax
+ mov %cr4,%eax
+ orl $0x208,%eax
+ mov %eax,%cr4
+ push %eax
+ mov %cr3,%eax
+ push %eax
+ mov %cr2,%eax
+ push %eax
+ xor %eax, %eax
+ push %eax
+ mov %cr0,%eax
+ push %eax
## UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7#
- movl %dr7, %eax
- pushl %eax
+ mov %dr7,%eax
+ push %eax
## clear Dr7 while executing debugger itself
- xorl %eax, %eax
- movl %eax, %dr7
+ xor %eax, %eax
+ mov %eax,%dr7
- movl %dr6, %eax
- pushl %eax
+ mov %dr6,%eax
+ push %eax
## insure all status bits in dr6 are clear...
- xorl %eax, %eax
- movl %eax, %dr6
-
- movl %dr3, %eax
- pushl %eax
- movl %dr2, %eax
- pushl %eax
- movl %dr1, %eax
- pushl %eax
- movl %dr0, %eax
- pushl %eax
-
-## FX_SAVE_STATE_IA32 FxSaveState#
- subl $512, %esp
- movl %esp, %edi
- #.byte 0f, 0ae, 00000111y #fxsave [edi]
+ xor %eax, %eax
+ mov %eax,%dr6
+
+ mov %dr3,%eax
+ push %eax
+ mov %dr2,%eax
+ push %eax
+ mov %dr1,%eax
+ push %eax
+ mov %dr0,%eax
+ push %eax
+
+## FX_SAVE_STATE_IA32 FxSaveState;
+ sub $512,%esp
+ mov %esp,%edi
fxsave (%edi)
-
-## UINT32 ExceptionData#
+
+## UINT32 ExceptionData;
pushl 2*4(%ebp)
## Prepare parameter and call
- movl %esp, %edx
- pushl %edx
- movl 1*4(%ebp), %eax
- pushl %eax
- cmpl $32, %eax
+ mov %esp,%edx
+ push %edx
+ mov 1*4(%ebp),%eax
+ push %eax
+ cmpl $32,%eax
jb CallException
- call ASM_PFX(TimerHandler)
+ call TimerHandler
jmp ExceptionDone
CallException:
- call ASM_PFX(ExceptionHandler)
+ call ExceptionHandler
ExceptionDone:
- addl $8, %esp
+ addl $8,%esp
cli
-## UINT32 ExceptionData#
- addl $4, %esp
-
-## FX_SAVE_STATE_IA32 FxSaveState#
- movl %esp, %esi
- #db 0fh, 0aeh, 00001110y # fxrstor [esi]
- fxrstor (%esi)
- addl $512, %esp
-
-## UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7#
- popl %eax
- movl %eax, %dr0
- popl %eax
- movl %eax, %dr1
- popl %eax
- movl %eax, %dr2
- popl %eax
- movl %eax, %dr3
+## UINT32 ExceptionData;
+ addl $4,%esp
+
+## FX_SAVE_STATE_IA32 FxSaveState;
+ mov %esp,%esi
+ fxrstor (%esi)
+ addl $512,%esp
+
+#; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
+ pop %eax
+ mov %eax,%dr0
+ pop %eax
+ mov %eax,%dr1
+ pop %eax
+ mov %eax,%dr2
+ pop %eax
+ mov %eax,%dr3
## skip restore of dr6. We cleared dr6 during the context save.
- addl $4, %esp
- popl %eax
- movl %eax, %dr7
-
-## UINT32 Cr0, Cr1, Cr2, Cr3, Cr4#
- popl %eax
- movl %eax, %cr0
- addl $4, %esp # not for Cr1
- popl %eax
- movl %eax, %cr2
- popl %eax
- movl %eax, %cr3
- popl %eax
- movl %eax, %cr4
-
-## UINT32 EFlags#
- popl 5*4(%ebp)
-
-## UINT32 Ldtr, Tr#
-## UINT32 Gdtr[2], Idtr[2]#
+ addl $4,%esp
+ pop %eax
+ mov %eax,%dr7
+
+## UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
+ pop %eax
+ mov %eax,%cr0
+ addl $4,%esp # not for Cr1
+ pop %eax
+ mov %eax,%cr2
+ pop %eax
+ mov %eax,%cr3
+ pop %eax
+ mov %eax,%cr4
+
+## UINT32 EFlags;
+ popl 5*4(%ebp)
+
+## UINT32 Ldtr, Tr;
+## UINT32 Gdtr[2], Idtr[2];
## Best not let anyone mess with these particular registers...
- addl $24, %esp
+ addl $24,%esp
-## UINT32 Eip#
- popl 3*4(%ebp)
+## UINT32 Eip;
+ popl 3*4(%ebp)
-## UINT32 Gs, Fs, Es, Ds, Cs, Ss#
+## UINT32 Gs, Fs, Es, Ds, Cs, Ss;
## NOTE - modified segment registers could hang the debugger... We
## could attempt to insulate ourselves against this possibility,
## but that poses risks as well.
##
- popl %gs
- popl %fs
- popl %es
- popl %ds
+ pop %gs
+ pop %fs
+ pop %es
+ pop %ds
popl 4*4(%ebp)
- popl %ss
+ pop %ss
-## UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax#
- popl %edi
- popl %esi
- addl $4, %esp # not for ebp
- addl $4, %esp # not for esp
- popl %ebx
- popl %edx
- popl %ecx
- popl %eax
-
- movl %ebp, %esp
- popl %ebp
- addl $8, %esp
- iretl
-
-
-##############################################################################
+## UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
+ pop %edi
+ pop %esi
+ addl $4,%esp # not for ebp
+ addl $4,%esp # not for esp
+ pop %ebx
+ pop %edx
+ pop %ecx
+ pop %eax
+
+ mov %ebp,%esp
+ pop %ebp
+ addl $8,%esp
+ iret
+
+
+#;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
# data
-##############################################################################
+#;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-.align 2, 0x0
-gdtr:
- .word 8*8 - 1
- .long GDT_BASE
-
-##############################################################################
+ .data
+ .align 4
+
+gdtr: .short GDT_END - GDT_BASE - 1 # GDT limit
+ .long 0 # (GDT base gets set above)
+#;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
# global descriptor table (GDT)
-##############################################################################
+#;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+ .align 4
-.align 2, 0x90
+ .globl GDT_BASE
GDT_BASE:
- .quad 0x0 // null descriptor
- .quad 0x00cf92000000ffff // linear data segment descriptor
- .quad 0x00cf9a000000ffff // linear code segment descriptor
- .quad 0x00cf92000000ffff // system data segment descriptor
- .quad 0x00cf9a000000ffff // system code segment descriptor
- .quad 0x0 // spare segment descriptor
- .quad 0x0
- .quad 0x0
-
-.align 0x02
-
-idtr:
- .word IDT_END - IDT_BASE - 1 # IDT limit
- .long IDT_BASE
-
-##############################################################################
+# null descriptor
+NULL_SEL = .-GDT_BASE
+ .short 0 # limit 15:0
+ .short 0 # base 15:0
+ .byte 0 # base 23:16
+ .byte 0 # type
+ .byte 0 # limit 19:16, flags
+ .byte 0 # base 31:24
+
+# linear data segment descriptor
+LINEAR_SEL = .-GDT_BASE
+ .short 0x0FFFF # limit 0xFFFFF
+ .short 0 # base 0
+ .byte 0
+ .byte 0x092 # present, ring 0, data, expand-up, writable
+ .byte 0x0CF # page-granular, 32-bit
+ .byte 0
+
+# linear code segment descriptor
+LINEAR_CODE_SEL = .-GDT_BASE
+ .short 0x0FFFF # limit 0xFFFFF
+ .short 0 # base 0
+ .byte 0
+ .byte 0x09A # present, ring 0, data, expand-up, writable
+ .byte 0x0CF # page-granular, 32-bit
+ .byte 0
+
+# system data segment descriptor
+SYS_DATA_SEL = .-GDT_BASE
+ .short 0x0FFFF # limit 0xFFFFF
+ .short 0 # base 0
+ .byte 0
+ .byte 0x092 # present, ring 0, data, expand-up, writable
+ .byte 0x0CF # page-granular, 32-bit
+ .byte 0
+
+# system code segment descriptor
+SYS_CODE_SEL = .-GDT_BASE
+ .short 0x0FFFF # limit 0xFFFFF
+ .short 0 # base 0
+ .byte 0
+ .byte 0x09A # present, ring 0, data, expand-up, writable
+ .byte 0x0CF # page-granular, 32-bit
+ .byte 0
+
+# spare segment descriptor
+SPARE3_SEL = .-GDT_BASE
+ .short 0 # limit 0xFFFFF
+ .short 0 # base 0
+ .byte 0
+ .byte 0 # present, ring 0, data, expand-up, writable
+ .byte 0 # page-granular, 32-bit
+ .byte 0
+
+# spare segment descriptor
+SPARE4_SEL = .-GDT_BASE
+ .short 0 # limit 0xFFFFF
+ .short 0 # base 0
+ .byte 0
+ .byte 0 # present, ring 0, data, expand-up, writable
+ .byte 0 # page-granular, 32-bit
+ .byte 0
+
+# spare segment descriptor
+SPARE5_SEL = .-GDT_BASE
+ .short 0 # limit 0xFFFFF
+ .short 0 # base 0
+ .byte 0
+ .byte 0 # present, ring 0, data, expand-up, writable
+ .byte 0 # page-granular, 32-bit
+ .byte 0
+
+GDT_END:
+
+ .align 4
+
+
+
+idtr: .short IDT_END - IDT_BASE - 1 # IDT limit
+ .long 0 # (IDT base gets set above)
+#;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
# interrupt descriptor table (IDT)
#
# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ
# mappings. This implementation only uses the system timer and all other
# IRQs will remain masked. The descriptors for vectors 33+ are provided
# for convenience.
-##############################################################################
+#;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-.align 0x02
+#idt_tag .byte "IDT",0
+ .align 4
+.globl IDT_BASE
IDT_BASE:
- .skip 256 * 16
-
-/**
# divide by zero (INT 0)
-DIV_ZERO_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+DIV_ZERO_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# debug exception (INT 1)
-DEBUG_EXCEPT_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+DEBUG_EXCEPT_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# NMI (INT 2)
-NMI_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+NMI_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# soft breakpoint (INT 3)
-BREAKPOINT_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+BREAKPOINT_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# overflow (INT 4)
-OVERFLOW_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+OVERFLOW_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# bounds check (INT 5)
-BOUNDS_CHECK_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+BOUNDS_CHECK_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# invalid opcode (INT 6)
-INVALID_OPCODE_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+INVALID_OPCODE_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# device not available (INT 7)
-DEV_NOT_AVAIL_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+DEV_NOT_AVAIL_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# double fault (INT 8)
-DOUBLE_FAULT_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+DOUBLE_FAULT_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# Coprocessor segment overrun - reserved (INT 9)
-RSVD_INTR_SEL1 equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+RSVD_INTR_SEL1 = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# invalid TSS (INT 0ah)
-INVALID_TSS_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+INVALID_TSS_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# segment not present (INT 0bh)
-SEG_NOT_PRESENT_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+SEG_NOT_PRESENT_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# stack fault (INT 0ch)
-STACK_FAULT_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+STACK_FAULT_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# general protection (INT 0dh)
-GP_FAULT_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+GP_FAULT_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# page fault (INT 0eh)
-PAGE_FAULT_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
+PAGE_FAULT_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# Intel reserved - do not use (INT 0fh)
-RSVD_INTR_SEL2 equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-# floating point error (INT 10h)
-FLT_POINT_ERR_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-# alignment check (INT 11h)
-ALIGNMENT_CHECK_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-# machine check (INT 12h)
-MACHINE_CHECK_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-# SIMD floating-point exception (INT 13h)
-SIMD_EXCEPTION_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-REPEAT (32 - 20)
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-ENDM
+RSVD_INTR_SEL2 = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+# floating point error (INT 0x10)
+FLT_POINT_ERR_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+# alignment check (INT 0x11)
+ALIGNMENT_CHECK_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+# machine check (INT 0x12)
+MACHINE_CHECK_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+# SIMD floating-point exception (INT 0x13)
+SIMD_EXCEPTION_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+ .rept (32 - 20)
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+ .endr
# 72 unspecified descriptors
- db (72 * 8) dup(0)
+ .rept 72 * 8
+ .byte 0
+ .endr
-# IRQ 0 (System timer) - (INT 68h)
-IRQ0_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-# IRQ 1 (8042 Keyboard controller) - (INT 69h)
-IRQ1_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
+# IRQ 0 (System timer) - (INT 0x68)
+IRQ0_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+# IRQ 1 (8042 Keyboard controller) - (INT 0x69)
+IRQ1_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)
-IRQ2_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
+IRQ2_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# IRQ 3 (COM 2) - (INT 6bh)
-IRQ3_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
+IRQ3_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# IRQ 4 (COM 1) - (INT 6ch)
-IRQ4_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
+IRQ4_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# IRQ 5 (LPT 2) - (INT 6dh)
-IRQ5_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
+IRQ5_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# IRQ 6 (Floppy controller) - (INT 6eh)
-IRQ6_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
+IRQ6_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
# IRQ 7 (LPT 1) - (INT 6fh)
-IRQ7_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-# IRQ 8 (RTC Alarm) - (INT 70h)
-IRQ8_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-# IRQ 9 - (INT 71h)
-IRQ9_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-# IRQ 10 - (INT 72h)
-IRQ10_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-# IRQ 11 - (INT 73h)
-IRQ11_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-# IRQ 12 (PS/2 mouse) - (INT 74h)
-IRQ12_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-# IRQ 13 (Floating point error) - (INT 75h)
-IRQ13_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-# IRQ 14 (Secondary IDE) - (INT 76h)
-IRQ14_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
-# IRQ 15 (Primary IDE) - (INT 77h)
-IRQ15_SEL equ $-IDT_BASE
- dw 0 # offset 15:0
- dw SYS_CODE_SEL # selector 15:0
- db 0 # 0 for interrupt gate
- db 0eh OR 80h # (10001110)type = 386 interrupt gate, present
- dw 0 # offset 31:16
-
- db (1 * 8) dup(0)
-
-**/
+IRQ7_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+# IRQ 8 (RTC Alarm) - (INT 0x70)
+IRQ8_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+# IRQ 9 - (INT 0x71)
+IRQ9_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+# IRQ 10 - (INT 0x72)
+IRQ10_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+# IRQ 11 - (INT 0x73)
+IRQ11_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+# IRQ 12 (PS/2 mouse) - (INT 0x74)
+IRQ12_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+# IRQ 13 (Floating point error) - (INT 0x75)
+IRQ13_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+# IRQ 14 (Secondary IDE) - (INT 0x76)
+IRQ14_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+# IRQ 15 (Primary IDE) - (INT 0x77)
+IRQ15_SEL = .-IDT_BASE
+ .short 0 # offset 15:0
+ .short SYS_CODE_SEL # selector 15:0
+ .byte 0 # 0 for interrupt gate
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present
+ .short 0 # offset 31:16
+
+ .rept 1 * 8
+ .byte 0
+ .endr
+
IDT_END:
+
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