diff options
Diffstat (limited to 'DuetPkg/CpuDxe/X64/CpuInterrupt.S')
| -rwxr-xr-x | DuetPkg/CpuDxe/X64/CpuInterrupt.S | 866 |
1 files changed, 866 insertions, 0 deletions
diff --git a/DuetPkg/CpuDxe/X64/CpuInterrupt.S b/DuetPkg/CpuDxe/X64/CpuInterrupt.S new file mode 100755 index 0000000..f85792b --- /dev/null +++ b/DuetPkg/CpuDxe/X64/CpuInterrupt.S @@ -0,0 +1,866 @@ +#------------------------------------------------------------------------------
+#*
+#* 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):
+ movq $GDT_BASE,%rax # EAX=PHYSICAL address of gdt
+ movq %rax, gdtr + 2 # Put address of gdt into the gdtr
+ lgdt gdtr
+ movq $0x18, %rax
+ movq %rax, %gs
+ movq %rax, %fs
+ movq $IDT_BASE,%rax # EAX=PHYSICAL address of idt
+ movq %rax, idtr + 2 # Put address of idt into the idtr
+ lidt idtr
+ ret
+
+# VOID
+# InstallInterruptHandler (
+# UINTN Vector,
+# VOID (*Handler)(VOID)
+# )
+ .globl ASM_PFX(InstallInterruptHandler)
+ASM_PFX(InstallInterruptHandler):
+# Vector:DWORD @ 4(%esp)
+# Handler:DWORD @ 8(%esp)
+ push %rbx
+ pushfq # save eflags
+ cli # turn off interrupts
+ subq $0x10, %rsp # open some space on the stack
+ movq %rsp, %rbx
+
+ sidt (%rbx) # get fword address of IDT
+ movq 2(%rbx), %rbx # move offset of IDT into RBX
+ addq $0x10, %rsp # correct stack
+ movq %rcx, %rax # Get vector number
+ shlq $4, %rax # multiply by 16 to get offset
+ addq %rax, %rbx # add to IDT base to get entry
+ movq %rdx, %rax # load new address into IDT entry
+ movw %ax, (%rbx) # write bits 15..0 of offset
+ shrq $16, %rax # use ax to copy 31..16 to descriptors
+ movw %ax, 6(%rbx) # write bits 31..16 of offset
+ shrq $16, %rax # use eax to copy 63..32 to descriptors
+ movl %eax, 8(%rbx) # write bits 63..32 of offset
+ popfq # restore flags (possible enabling interrupts)
+ pop %rbx
+ ret
+
+ .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:
+ push $0x0 # push error code place holder on the stack
+ push $0x0
+ JmpCommonIdtEntry
+# db 0e9h # jmp 16 bit reletive
+# dd commonIdtEntry - $ - 4 # offset to jump to
+
+INT1:
+ push $0x0 # push error code place holder on the stack
+ push $0x1
+ JmpCommonIdtEntry
+
+INT2:
+ push $0x0 # push error code place holder on the stack
+ push $0x2
+ JmpCommonIdtEntry
+
+INT3:
+ push $0x0 # push error code place holder on the stack
+ push $0x3
+ JmpCommonIdtEntry
+
+INT4:
+ push $0x0 # push error code place holder on the stack
+ push $0x4
+ JmpCommonIdtEntry
+
+INT5:
+ push $0x0 # push error code place holder on the stack
+ push $0x5
+ JmpCommonIdtEntry
+
+INT6:
+ push $0x0 # push error code place holder on the stack
+ push $0x6
+ JmpCommonIdtEntry
+
+INT7:
+ push $0x0 # push error code place holder on the stack
+ push $0x7
+ JmpCommonIdtEntry
+
+INT8:
+# Double fault causes an error code to be pushed so no phony push necessary
+ nop
+ nop
+ push $0x8
+ JmpCommonIdtEntry
+
+INT9:
+ push $0x0 # push error code place holder on the stack
+ push $0x9
+ JmpCommonIdtEntry
+
+INT10:
+# Invalid TSS causes an error code to be pushed so no phony push necessary
+ nop
+ nop
+ push $10
+ JmpCommonIdtEntry
+
+INT11:
+# Segment Not Present causes an error code to be pushed so no phony push necessary
+ nop
+ nop
+ push $11
+ JmpCommonIdtEntry
+
+INT12:
+# Stack fault causes an error code to be pushed so no phony push necessary
+ nop
+ nop
+ push $12
+ JmpCommonIdtEntry
+
+INT13:
+# GP fault causes an error code to be pushed so no phony push necessary
+ nop
+ nop
+ push $13
+ JmpCommonIdtEntry
+
+INT14:
+# Page fault causes an error code to be pushed so no phony push necessary
+ nop
+ nop
+ push $14
+ JmpCommonIdtEntry
+
+INT15:
+ push $0x0 # push error code place holder on the stack
+ push $15
+ JmpCommonIdtEntry
+
+INT16:
+ push $0x0 # push error code place holder on the stack
+ push $16
+ JmpCommonIdtEntry
+
+INT17:
+# Alignment check causes an error code to be pushed so no phony push necessary
+ nop
+ nop
+ push $17
+ JmpCommonIdtEntry
+
+INT18:
+ push $0x0 # push error code place holder on the stack
+ push $18
+ JmpCommonIdtEntry
+
+INT19:
+ push $0x0 # push error code place holder on the stack
+ push $19
+ JmpCommonIdtEntry
+
+INTUnknown:
+ .rept (32 - 20)
+ push $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):
+ push $0
+ push $ASM_PFX(mTimerVector)
+ JmpCommonIdtEntry
+
+commonIdtEntry:
+# +---------------------+
+# + EFlags +
+# +---------------------+
+# + CS +
+# +---------------------+
+# + EIP +
+# +---------------------+
+# + Error Code +
+# +---------------------+
+# + Vector Number +
+# +---------------------+
+# + EBP +
+# +---------------------+ <-- EBP
+
+ cli
+ push %rbp
+ movq %rsp,%rbp
+
+ #
+ # Since here the stack pointer is 16-byte aligned, so
+ # EFI_FX_SAVE_STATE_X64 of EFI_SYSTEM_CONTEXT_x64
+ # is 16-byte aligned
+ #
+
+## UINT64 Rdi, Rsi, Rbp, Rsp, Rbx, Rdx, Rcx, Rax#
+## UINT64 R8, R9, R10, R11, R12, R13, R14, R15#
+ push %r15
+ push %r14
+ push %r13
+ push %r12
+ push %r11
+ push %r10
+ push %r9
+ push %r8
+ push %rax
+ push %rcx
+ push %rdx
+ push %rbx
+ push 6*8(%rbp)
+ push (%rbp)
+ push %rsi
+ push %rdi
+
+## UINT64 Gs, Fs, Es, Ds, Cs, Ss# insure high 16 bits of each is zero
+ movzx 7*8(%rbp), %rax
+ push %rax # for ss
+ movzx 4*8(%rbp), %rax
+ push %rax # for cs
+ movq %ds, %rax
+ push %rax
+ movq %es, %rax
+ push %rax
+ movq %fs, %rax
+ push %rax
+ movq %gs, %rax
+ push %rax
+
+## UINT64 Rip#
+ push 3*8(%rbp)
+
+## UINT64 Gdtr[2], Idtr[2]#
+ subq $16, %rsp
+ sidt (%rsp)
+ subq $16, %rsp
+ sgdt (%rsp)
+
+## UINT64 Ldtr, Tr#
+ xorq %rax, %rax
+ str %ax
+ push %rax
+ sldt %ax
+ push %rax
+
+## UINT64 RFlags#
+ push 5*8(%rbp)
+
+## UINT64 Cr0, Cr1, Cr2, Cr3, Cr4, Cr8#
+ movq %cr8, %rax
+ push %rax
+ movq %cr4, %rax
+ orq $0x208, %rax
+ movq %rax, %cr4
+ push %rax
+ movq %cr3, %rax
+ push %rax
+ movq %cr2, %rax
+ push %rax
+ xorq %rax, %rax
+ push %rax
+ movq %cr0, %rax
+ push %rax
+
+## UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7#
+ movq %dr7, %rax
+ push %rax
+
+## clear Dr7 while executing debugger itself
+ xorq %rax, %rax
+ movq %rax, %dr7
+
+ movq %dr6, %rax
+ push %rax
+
+## insure all status bits in dr6 are clear...
+ xorq %rax, %rax
+ movq %rax, %dr6
+
+ movq %dr3, %rax
+ push %rax
+ movq %dr2, %rax
+ push %rax
+ movq %dr1, %rax
+ push %rax
+ movq %dr0, %rax
+ push %rax
+
+
+## FX_SAVE_STATE_X64 FxSaveState#
+ subq $512, %rsp
+ movq %rsp, %rdi
+ fxsave (%rdi)
+
+## UINT64 ExceptionData#
+ push 2*8 (%rbp)
+
+## call into exception handler
+## Prepare parameter and call
+ movq 1*8(%rbp), %rcx
+ movq %rsp, %rdx
+ #
+ # Per X64 calling convention, allocate maximum parameter stack space
+ # and make sure RSP is 16-byte aligned
+ #
+ subq $(4*8+8), %rsp
+ cmpq $32, %rcx
+ jb CallException
+ call ASM_PFX(TimerHandler)
+ jmp ExceptionDone
+CallException:
+ call ASM_PFX(ExceptionHandler)
+ExceptionDone:
+ addq $(4*8+8), %rsp
+
+ cli
+
+## UINT64 ExceptionData#
+ addq $8, %rsp
+
+## FX_SAVE_STATE_X64 FxSaveState#
+ movq %rsp, %rsi
+ fxrstor (%esi)
+ addq $512, %rsp
+
+
+## UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7#
+ pop %rax
+ movq %rax, %dr0
+ pop %rax
+ movq %rax, %dr1
+ pop %rax
+ movq %rax, %dr2
+ pop %rax
+ movq %rax, %dr3
+## skip restore of dr6. We cleared dr6 during the context save.
+ addq $8, %rsp
+ pop %rax
+ movq %rax, %dr7
+
+## UINT64 Cr0, Cr1, Cr2, Cr3, Cr4, Cr8#
+ pop %rax
+ movq %rax, %cr0
+ addq $8, %rsp # not for Cr1
+ pop %rax
+ movq %rax, %cr2
+ pop %rax
+ movq %rax, %cr3
+ pop %rax
+ movq %rax, %cr4
+ pop %rax
+ mov %rax, %cr8
+
+## UINT64 RFlags#
+ pop 5*8(%rbp)
+
+## UINT64 Ldtr, Tr#
+## UINT64 Gdtr[2], Idtr[2]#
+## Best not let anyone mess with these particular registers...
+ addq $48, %rsp
+
+## UINT64 Rip#
+ pop 3*8(%rbp)
+
+## UINT64 Gs, Fs, Es, Ds, Cs, Ss#
+ pop %rax
+ # mov gs, rax # not for gs
+ pop %rax
+ # mov fs, rax # not for fs
+ # (X64 will not use fs and gs, so we do not restore it)
+ pop %rax
+ movq %rax, %es
+ pop %rax
+ movq %rax, %ds
+ pop 4*8(%rbp) # for cs
+ pop 7*8(%rbp) # for ss
+
+## UINT64 Rdi, Rsi, Rbp, Rsp, Rbx, Rdx, Rcx, Rax#
+## UINT64 R8, R9, R10, R11, R12, R13, R14, R15#
+ pop %rdi
+ pop %rsi
+ addq $8, %rsp # not for rbp
+ pop 6*8(%rbp) # for rsp
+ pop %rbx
+ pop %rdx
+ pop %rcx
+ pop %rax
+ pop %r8
+ pop %r9
+ pop %r10
+ pop %r11
+ pop %r12
+ pop %r13
+ pop %r14
+ pop %r15
+
+ movq %rbp, %rsp
+ pop %rbp
+ addq $16, %rsp
+ iretq
+
+
+##############################################################################
+# data
+##############################################################################
+
+ .data
+ .align 0x10
+
+gdtr: .short GDT_END - GDT_BASE - 1 # GDT limit
+ .quad 0 # (GDT base gets set above)
+##############################################################################
+# global descriptor table (GDT)
+##############################################################################
+
+ .align 0x10
+
+GDT_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 0x4
+
+
+
+idtr: .short IDT_END - IDT_BASE - 1 # IDT limit
+ .quad 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.
+##############################################################################
+
+#idt_tag .byte "IDT",0
+ .align 0x4
+
+IDT_BASE:
+# divide by zero (INT 0)
+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 = .-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 = .-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 = .-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 = .-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 = .-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 = .-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 = .-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 = .-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 = .-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 = .-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 = .-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 = .-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 = .-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 = .-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 = .-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
+ .rept 72 * 8
+ .byte 0
+ .endr
+
+# 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 = .-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 = .-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 = .-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 = .-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 = .-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 = .-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 * 16
+ .byte 0
+ .endr
+
+IDT_END:
+
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