- leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map
-
-# mov ax,0b800h
-# mov es,ax
-# mov byte ptr es:[162],'b'
-# mov ax,cs
-# mov es,ax
-
-#
-# Enable A20 Gate
-#
-
- movw $0x2401,%ax # Enable A20 Gate
- int $0x15
- jnc A20GateEnabled # Jump if it suceeded
-
-#
-# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.
-#
-
- call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
- jnz Timeout8042 # Jump if the 8042 timed out
- outw %ax, $DELAY_PORT # Delay 1 uS
- movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port
- outb %al, $KBD_STATUS_PORT # Send command to the 8042
- call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
- jnz Timeout8042 # Jump if the 8042 timed out
- movb $ENABLE_A20_CMD, %al # gate address bit 20 on
- outb %al, $KBD_CONTROL_PORT # Send command to thre 8042
- call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
- movw $25,%cx # Delay 25 uS for the command to complete on the 8042
-Delay25uS:
- outw %ax, $DELAY_PORT # Delay 1 uS
- loop Delay25uS
-Timeout8042:
-
-
-A20GateEnabled:
-
-#
-# DISABLE INTERRUPTS - Entering Protected Mode
-#
-
- cli
-
-# mov ax,0b800h
-# mov es,ax
-# mov byte ptr es:[164],'c'
-# mov ax,cs
-# mov es,ax
-
- leal OffsetIn32BitProtectedMode, %eax
- addl $0x20000+0x6,%eax
- movl %eax, OffsetIn32BitProtectedMode
-
- leal OffsetInLongMode, %eax
- addl $0x20000+0x6,%eax
- movl %eax, OffsetInLongMode
-
- #
- # load GDT
- #
- .byte 0x66
- lgdt gdtr
-
- #
- # Enable Protect Mode (set CR0.PE=1)
- #
- movl %cr0, %eax # Read CR0.
- orl $0x1,%eax # Set PE=1
- movl %eax, %cr0 # Write CR0.
- .byte 0x66
- .byte 0xea # jmp far 16:32
-OffsetIn32BitProtectedMode:
- .long 0x0000000 # offset $+8 (In32BitProtectedMode)
- .word 0x10 # selector (flat CS)
-In32BitProtectedMode:
-
-#
-# Entering Long Mode
-#
- .byte 0x66
- movw $8,%ax
- movw %ax,%ds
- movw %ax,%es
- movw %ax,%ss
-
- #
- # Enable the 64-bit page-translation-table entries by
- # setting CR4.PAE=1 (this is _required_ before activating
- # long mode). Paging is not enabled until after long mode
- # is enabled.
- #
- .byte 0xf
- .byte 0x20
- .byte 0xe0
-# mov eax, cr4
- btsl $5,%eax
- .byte 0xf
- .byte 0x22
- .byte 0xe0
-# mov cr4, eax
-
- #
- # This is the Trapolean Page Tables that are guarenteed
- # under 4GB.
- #
- # Address Map:
- # 10000 ~ 12000 - efildr (loaded)
- # 20000 ~ 21000 - start64.com
- # 21000 ~ 22000 - efi64.com
- # 22000 ~ 90000 - efildr
- # 90000 ~ 96000 - 4G pagetable (will be reload later)
- #
- .byte 0xb8
- .long 0x90000
-# mov eax, 90000h
- movl %eax, %cr3
-
- #
- # Enable long mode (set EFER.LME=1).
- #
- .byte 0xb9
- .long 0xc0000080
-# mov ecx, 0c0000080h ; EFER MSR number.
- .byte 0xf
- .byte 0x32
-# rdmsr ; Read EFER.
- .byte 0xf
- .byte 0xba
- .byte 0xe8
- .byte 0x8
-# bts eax, 8 ; Set LME=1.
- .byte 0xf
- .byte 0x30
-# wrmsr ; Write EFER.
-
- #
- # Enable paging to activate long mode (set CR0.PG=1)
- #
- movl $cr0, %eax # Read CR0.
- .byte 0xf
- .byte 0xba
- .byte 0xe8
- .byte 0x1f
-# bts eax, 31 ; Set PG=1.
- movl %eax, %cr0 # Write CR0.
- jmp GoToLongMode
-GoToLongMode:
-
- .byte 0x67
- .byte 0xea # Far Jump $+9:Selector to reload CS
-OffsetInLongMode:
- .long 00000000 # $+9 Offset is ensuing instruction boundary
- .word 0x38 # Selector is our code selector, 38h
-
-InLongMode:
- .byte 0x66
- movw $0x30,%ax
- movw %ax,%ds
-
- .byte 0x66
- movw $0x18,%ax
- movw %ax,%es
- movw %ax,%ss
- movw %ax,%ds
-
- .byte 0xbd
- .long 0x400000
-# mov ebp,000400000h ; Destination of EFILDR32
- .byte 0xbb
- .long 0x70000
-# mov ebx,000070000h ; Length of copy
-
- #
- # load idt later
- #
- .byte 0x48
- .byte 0x33
- .byte 0xc0
-# xor rax, rax
- .byte 0x66
- movw $idtr, %ax
- .byte 0x48
- .byte 0x5
- .long 0x20000
-# add rax, 20000h
-
- .byte 0xf
- .byte 0x1
- .byte 0x18
-# lidt fword ptr [rax]
-
- .byte 0x48
- .byte 0xc7
- .byte 0xc0
- .long 0x21000
-# mov rax, 21000h
- .byte 0x50
-# push rax
-
-# ret
- .byte 0xc3
-
-Empty8042InputBuffer:
- movw $0,%cx
-Empty8042Loop:
- outw %ax, $DELAY_PORT # Delay 1us
- inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port
- andb $0x2,%al # Check the Input Buffer Full Flag
- loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS
- ret
-
-##############################################################################
-# data
-##############################################################################
-
- .align 0x2
-
- gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit
- .long 0 # (GDT base gets set above)
-##############################################################################
-# global descriptor table (GDT)
-##############################################################################
-
- .align 0x2
-
-GDT_BASE:
-# null descriptor
-.equ NULL_SEL, .-GDT_BASE # Selector [0x0]
- .word 0 # limit 15:0
- .word 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
-.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x92 # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# linear code segment descriptor
-.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x9A # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# system data segment descriptor
-.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x92 # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# system code segment descriptor
-.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x9A # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# spare segment descriptor
-.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28]
- .word 0 # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0 # present, ring 0, data, expand-up, writable
- .byte 0 # page-granular, 32-bit
- .byte 0
-
-#
-# system data segment descriptor
-#
-.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A
- .byte 0xCF # G | D | L | AVL | Segment [19..16]
- .byte 0
-
-#
-# system code segment descriptor
-#
-.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A
- .byte 0xAF # G | D | L | AVL | Segment [19..16]
- .byte 0
-
-# spare segment descriptor
-.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40]
- .word 0 # limit 0xFFFFF
- .word 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 0x2
-
-
-
-idtr: .long 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 db "IDT",0
- .align 0x2
-
-
-IDT_BASE:
-# divide by zero (INT 0)
-.equ DIV_ZERO_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# debug exception (INT 1)
-.equ DEBUG_EXCEPT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# NMI (INT 2)
-.equ NMI_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# soft breakpoint (INT 3)
-.equ BREAKPOINT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# overflow (INT 4)
-.equ OVERFLOW_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# bounds check (INT 5)
-.equ BOUNDS_CHECK_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# invalid opcode (INT 6)
-.equ INVALID_OPCODE_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# device not available (INT 7)
-.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# double fault (INT 8)
-.equ DOUBLE_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# Coprocessor segment overrun - reserved (INT 9)
-.equ RSVD_INTR_SEL1, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# invalid TSS (INT 0ah)
-.equ INVALID_TSS_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# segment not present (INT 0bh)
-.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# stack fault (INT 0ch)
-.equ STACK_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# general protection (INT 0dh)
-.equ GP_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# page fault (INT 0eh)
-.equ PAGE_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# Intel reserved - do not use (INT 0fh)
-.equ RSVD_INTR_SEL2, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# floating point error (INT 10h)
-.equ FLT_POINT_ERR_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# alignment check (INT 11h)
-.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# machine check (INT 12h)
-.equ MACHINE_CHECK_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# SIMD floating-point exception (INT 13h)
-.equ SIMD_EXCEPTION_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail
- .fill 85 * 16, 1, 0 # db (85 * 16) dup(0)
-
-# IRQ 0 (System timer) - (INT 68h)
-.equ IRQ0_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 1 (8042 Keyboard controller) - (INT 69h)
-.equ IRQ1_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)
-.equ IRQ2_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 3 (COM 2) - (INT 6bh)
-.equ IRQ3_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 4 (COM 1) - (INT 6ch)
-.equ IRQ4_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 5 (LPT 2) - (INT 6dh)
-.equ IRQ5_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 6 (Floppy controller) - (INT 6eh)
-.equ IRQ6_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 7 (LPT 1) - (INT 6fh)
-.equ IRQ7_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 8 (RTC Alarm) - (INT 70h)
-.equ IRQ8_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 9 - (INT 71h)
-.equ IRQ9_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 10 - (INT 72h)
-.equ IRQ10_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 11 - (INT 73h)
-.equ IRQ11_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 12 (PS/2 mouse) - (INT 74h)
-.equ IRQ12_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 13 (Floating point error) - (INT 75h)
-.equ IRQ13_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 14 (Secondary IDE) - (INT 76h)
-.equ IRQ14_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 15 (Primary IDE) - (INT 77h)
-.equ IRQ15_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-IDT_END:
-
- .align 0x2
-
-MemoryMapSize: .long 0
-MemoryMap: .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
-
- .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
- .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
-
- .org 0x0fe0
-MyStack:
- # below is the pieces of the IVT that is used to redirect INT 68h - 6fh
- # back to INT 08h - 0fh when in real mode... It is 'org'ed to a
- # known low address (20f00) so it can be set up by PlMapIrqToVect in
- # 8259.c
-
- int $8
- iret
-
- int $9
- iret
-
- int $10
- iret
-
- int $11
- iret
-
- int $12
- iret
-
- int $13
- iret
-
- int $14
- iret
-
- int $15
- iret
-
-
- .org 0x0ffe
-BlockSignature:
- .word 0xaa55
-
+ leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map\r
+\r
+# mov ax,0b800h\r
+# mov es,ax\r
+# mov byte ptr es:[162],'b'\r
+# mov ax,cs\r
+# mov es,ax\r
+\r
+#\r
+# Enable A20 Gate \r
+#\r
+\r
+ movw $0x2401,%ax # Enable A20 Gate\r
+ int $0x15\r
+ jnc A20GateEnabled # Jump if it suceeded\r
+\r
+#\r
+# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.\r
+#\r
+\r
+ call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
+ jnz Timeout8042 # Jump if the 8042 timed out\r
+ outw %ax, $DELAY_PORT # Delay 1 uS\r
+ movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port\r
+ outb %al, $KBD_STATUS_PORT # Send command to the 8042\r
+ call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
+ jnz Timeout8042 # Jump if the 8042 timed out\r
+ movb $ENABLE_A20_CMD, %al # gate address bit 20 on\r
+ outb %al, $KBD_CONTROL_PORT # Send command to thre 8042\r
+ call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
+ movw $25,%cx # Delay 25 uS for the command to complete on the 8042\r
+Delay25uS: \r
+ outw %ax, $DELAY_PORT # Delay 1 uS\r
+ loop Delay25uS\r
+Timeout8042: \r
+\r
+\r
+A20GateEnabled: \r
+\r
+#\r
+# DISABLE INTERRUPTS - Entering Protected Mode\r
+#\r
+\r
+ cli\r
+\r
+# mov ax,0b800h\r
+# mov es,ax\r
+# mov byte ptr es:[164],'c'\r
+# mov ax,cs\r
+# mov es,ax\r
+\r
+ leal OffsetIn32BitProtectedMode, %eax\r
+ addl $0x20000+0x6,%eax\r
+ movl %eax, OffsetIn32BitProtectedMode \r
+\r
+ leal OffsetInLongMode, %eax\r
+ addl $0x20000+0x6,%eax\r
+ movl %eax, OffsetInLongMode \r
+\r
+ #\r
+ # load GDT\r
+ #\r
+ .byte 0x66\r
+ lgdt gdtr\r
+\r
+ #\r
+ # Enable Protect Mode (set CR0.PE=1)\r
+ #\r
+ movl %cr0, %eax # Read CR0.\r
+ orl $0x1,%eax # Set PE=1\r
+ movl %eax, %cr0 # Write CR0.\r
+ .byte 0x66\r
+ .byte 0xea # jmp far 16:32\r
+OffsetIn32BitProtectedMode: \r
+ .long 0x0000000 # offset $+8 (In32BitProtectedMode)\r
+ .word 0x10 # selector (flat CS)\r
+In32BitProtectedMode: \r
+\r
+#\r
+# Entering Long Mode\r
+#\r
+ .byte 0x66\r
+ movw $8,%ax\r
+ movw %ax,%ds\r
+ movw %ax,%es\r
+ movw %ax,%ss\r
+\r
+ #\r
+ # Enable the 64-bit page-translation-table entries by\r
+ # setting CR4.PAE=1 (this is _required_ before activating\r
+ # long mode). Paging is not enabled until after long mode\r
+ # is enabled.\r
+ #\r
+ .byte 0xf\r
+ .byte 0x20\r
+ .byte 0xe0\r
+# mov eax, cr4\r
+ btsl $5,%eax\r
+ .byte 0xf\r
+ .byte 0x22\r
+ .byte 0xe0\r
+# mov cr4, eax\r
+\r
+ #\r
+ # This is the Trapolean Page Tables that are guarenteed\r
+ # under 4GB.\r
+ #\r
+ # Address Map:\r
+ # 10000 ~ 12000 - efildr (loaded)\r
+ # 20000 ~ 21000 - start64.com\r
+ # 21000 ~ 22000 - efi64.com\r
+ # 22000 ~ 90000 - efildr\r
+ # 90000 ~ 96000 - 4G pagetable (will be reload later)\r
+ #\r
+ .byte 0xb8\r
+ .long 0x90000\r
+# mov eax, 90000h\r
+ movl %eax, %cr3\r
+\r
+ #\r
+ # Enable long mode (set EFER.LME=1).\r
+ #\r
+ .byte 0xb9\r
+ .long 0xc0000080\r
+# mov ecx, 0c0000080h ; EFER MSR number.\r
+ .byte 0xf\r
+ .byte 0x32\r
+# rdmsr ; Read EFER.\r
+ .byte 0xf\r
+ .byte 0xba\r
+ .byte 0xe8\r
+ .byte 0x8\r
+# bts eax, 8 ; Set LME=1.\r
+ .byte 0xf\r
+ .byte 0x30\r
+# wrmsr ; Write EFER.\r
+\r
+ #\r
+ # Enable paging to activate long mode (set CR0.PG=1)\r
+ #\r
+ movl $cr0, %eax # Read CR0.\r
+ .byte 0xf\r
+ .byte 0xba\r
+ .byte 0xe8\r
+ .byte 0x1f\r
+# bts eax, 31 ; Set PG=1.\r
+ movl %eax, %cr0 # Write CR0.\r
+ jmp GoToLongMode\r
+GoToLongMode: \r
+\r
+ .byte 0x67\r
+ .byte 0xea # Far Jump $+9:Selector to reload CS\r
+OffsetInLongMode: \r
+ .long 00000000 # $+9 Offset is ensuing instruction boundary\r
+ .word 0x38 # Selector is our code selector, 38h\r
+\r
+InLongMode: \r
+ .byte 0x66\r
+ movw $0x30,%ax\r
+ movw %ax,%ds\r
+\r
+ .byte 0x66\r
+ movw $0x18,%ax\r
+ movw %ax,%es\r
+ movw %ax,%ss\r
+ movw %ax,%ds\r
+\r
+ .byte 0xbd\r
+ .long 0x400000\r
+# mov ebp,000400000h ; Destination of EFILDR32\r
+ .byte 0xbb\r
+ .long 0x70000\r
+# mov ebx,000070000h ; Length of copy\r
+\r
+ #\r
+ # load idt later\r
+ #\r
+ .byte 0x48\r
+ .byte 0x33\r
+ .byte 0xc0\r
+# xor rax, rax\r
+ .byte 0x66\r
+ movw $idtr, %ax\r
+ .byte 0x48\r
+ .byte 0x5\r
+ .long 0x20000\r
+# add rax, 20000h\r
+\r
+ .byte 0xf\r
+ .byte 0x1\r
+ .byte 0x18\r
+# lidt fword ptr [rax]\r
+\r
+ .byte 0x48\r
+ .byte 0xc7\r
+ .byte 0xc0\r
+ .long 0x21000\r
+# mov rax, 21000h\r
+ .byte 0x50\r
+# push rax\r
+\r
+# ret\r
+ .byte 0xc3\r
+\r
+Empty8042InputBuffer: \r
+ movw $0,%cx\r
+Empty8042Loop: \r
+ outw %ax, $DELAY_PORT # Delay 1us\r
+ inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port\r
+ andb $0x2,%al # Check the Input Buffer Full Flag\r
+ loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS\r
+ ret\r
+\r
+##############################################################################\r
+# data\r
+##############################################################################\r
+\r
+ .align 0x2\r
+\r
+ gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit \r
+ .long 0 # (GDT base gets set above)\r
+##############################################################################\r
+# global descriptor table (GDT)\r
+##############################################################################\r
+\r
+ .align 0x2\r
+\r
+GDT_BASE: \r
+# null descriptor\r
+.equ NULL_SEL, .-GDT_BASE # Selector [0x0]\r
+ .word 0 # limit 15:0\r
+ .word 0 # base 15:0\r
+ .byte 0 # base 23:16\r
+ .byte 0 # type\r
+ .byte 0 # limit 19:16, flags\r
+ .byte 0 # base 31:24\r
+\r
+# linear data segment descriptor\r
+.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x92 # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# linear code segment descriptor\r
+.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x9A # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# system data segment descriptor\r
+.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x92 # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# system code segment descriptor\r
+.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x9A # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# spare segment descriptor\r
+.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28]\r
+ .word 0 # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0 # present, ring 0, data, expand-up, writable\r
+ .byte 0 # page-granular, 32-bit\r
+ .byte 0\r
+\r
+#\r
+# system data segment descriptor\r
+#\r
+.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A\r
+ .byte 0xCF # G | D | L | AVL | Segment [19..16]\r
+ .byte 0\r
+\r
+#\r
+# system code segment descriptor\r
+#\r
+.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A\r
+ .byte 0xAF # G | D | L | AVL | Segment [19..16]\r
+ .byte 0\r
+\r
+# spare segment descriptor\r
+.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40]\r
+ .word 0 # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0 # present, ring 0, data, expand-up, writable\r
+ .byte 0 # page-granular, 32-bit\r
+ .byte 0\r
+\r
+GDT_END: \r
+\r
+ .align 0x2\r
+\r
+\r
+\r
+idtr: .long IDT_END - IDT_BASE - 1 # IDT limit\r
+ .quad 0 # (IDT base gets set above)\r
+\r
+##############################################################################\r
+# interrupt descriptor table (IDT)\r
+#\r
+# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ\r
+# mappings. This implementation only uses the system timer and all other\r
+# IRQs will remain masked. The descriptors for vectors 33+ are provided\r
+# for convenience.\r
+##############################################################################\r
+\r
+#idt_tag db "IDT",0 \r
+ .align 0x2\r
+\r
+\r
+IDT_BASE: \r
+# divide by zero (INT 0)\r
+.equ DIV_ZERO_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# debug exception (INT 1)\r
+.equ DEBUG_EXCEPT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# NMI (INT 2)\r
+.equ NMI_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# soft breakpoint (INT 3)\r
+.equ BREAKPOINT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# overflow (INT 4)\r
+.equ OVERFLOW_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# bounds check (INT 5)\r
+.equ BOUNDS_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# invalid opcode (INT 6)\r
+.equ INVALID_OPCODE_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# device not available (INT 7)\r
+.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# double fault (INT 8)\r
+.equ DOUBLE_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# Coprocessor segment overrun - reserved (INT 9)\r
+.equ RSVD_INTR_SEL1, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# invalid TSS (INT 0ah)\r
+.equ INVALID_TSS_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# segment not present (INT 0bh)\r
+.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# stack fault (INT 0ch)\r
+.equ STACK_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# general protection (INT 0dh)\r
+.equ GP_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# page fault (INT 0eh)\r
+.equ PAGE_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# Intel reserved - do not use (INT 0fh)\r
+.equ RSVD_INTR_SEL2, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# floating point error (INT 10h)\r
+.equ FLT_POINT_ERR_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# alignment check (INT 11h)\r
+.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# machine check (INT 12h)\r
+.equ MACHINE_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# SIMD floating-point exception (INT 13h)\r
+.equ SIMD_EXCEPTION_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail\r
+ .fill 85 * 16, 1, 0 # db (85 * 16) dup(0)\r
+\r
+# IRQ 0 (System timer) - (INT 68h)\r
+.equ IRQ0_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 1 (8042 Keyboard controller) - (INT 69h)\r
+.equ IRQ1_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)\r
+.equ IRQ2_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 3 (COM 2) - (INT 6bh)\r
+.equ IRQ3_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 4 (COM 1) - (INT 6ch)\r
+.equ IRQ4_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 5 (LPT 2) - (INT 6dh)\r
+.equ IRQ5_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 6 (Floppy controller) - (INT 6eh)\r
+.equ IRQ6_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 7 (LPT 1) - (INT 6fh)\r
+.equ IRQ7_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 8 (RTC Alarm) - (INT 70h)\r
+.equ IRQ8_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 9 - (INT 71h)\r
+.equ IRQ9_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 10 - (INT 72h)\r
+.equ IRQ10_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 11 - (INT 73h)\r
+.equ IRQ11_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 12 (PS/2 mouse) - (INT 74h)\r
+.equ IRQ12_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 13 (Floating point error) - (INT 75h)\r
+.equ IRQ13_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 14 (Secondary IDE) - (INT 76h)\r
+.equ IRQ14_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 15 (Primary IDE) - (INT 77h)\r
+.equ IRQ15_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+IDT_END: \r
+\r
+ .align 0x2\r
+\r
+MemoryMapSize: .long 0\r
+MemoryMap: .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+\r
+ .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\r
+ .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\r
+\r
+ .org 0x0fe0\r
+MyStack: \r
+ # below is the pieces of the IVT that is used to redirect INT 68h - 6fh\r
+ # back to INT 08h - 0fh when in real mode... It is 'org'ed to a\r
+ # known low address (20f00) so it can be set up by PlMapIrqToVect in\r
+ # 8259.c\r
+\r
+ int $8\r
+ iret\r
+\r
+ int $9\r
+ iret\r
+\r
+ int $10\r
+ iret\r
+\r
+ int $11\r
+ iret\r
+\r
+ int $12\r
+ iret\r
+\r
+ int $13\r
+ iret\r
+\r
+ int $14\r
+ iret\r
+\r
+ int $15\r
+ iret\r
+\r
+\r
+ .org 0x0ffe\r
+BlockSignature: \r
+ .word 0xaa55\r
+\r