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misc_tools.asm
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;all this stuff is in 32bit assembly so don't put any real mode specific stuff in here
[BITS 32]
[CPU 486]
section .auxfunctions
;sets IOPL to 3 regardless of anything else
global forceIOPL_High
forceIOPL_High:
pushf
pop eax
or eax, 0x3000
push eax
popf
ret
;sets IOPL to 0 regardless of anything else
global forceIOPL_Low
forceIOPL_Low:
pushf
pop eax
and eax, 0xCFFF
push eax
popf
ret
;here's my real mode x86 keyboard stuff. I see no reason why it wouldn't work here tbh
global waitAck
waitAck:
call kbd8042WaitReadReady
in al, 060h
cmp al, 0FAh
jne waitAck
ret
global kbd8042WaitReadReady
kbd8042WaitReadReady:
in al, 064h ;8042 status port
and al, 00000001b ;read the data register read ready bit
cmp al, 1
jne kbd8042WaitReadReady ;if it's not ready, keep waiting until it is
ret
global kbd8042WaitWriteReady
kbd8042WaitWriteReady:
in al, 064h
and al, 00000010b
ror al, 1
cmp al, 0
jne kbd8042WaitWriteReady
ret
;do note that changing compilers may make these stop working because of calling conventions and all
;char byte, unsigned int port
global asmOutb
asmOutb:
push ebp
mov ebp, esp
mov edx, [ebp+12]
mov eax, [ebp+8]
out dx, al
leave
ret
;unsigned int port
global asmInb
asmInb:
push ebp
mov ebp, esp
mov edx, [ebp+8]
mov eax, 0
in al, dx
leave
ret
;;the same thing but for 16 bit transfers
global asmOutW
asmOutW:
push ebp
mov ebp, esp
mov edx, [ebp+12]
mov eax, [ebp+8]
out dx, ax
leave
ret
global asmInW
asmInW:
push ebp
mov ebp, esp
mov edx, [ebp+8]
mov eax, 0
in ax, dx
leave
ret
;cpuid command. get information about the cpu and then return it
global cpu_ident
cpu_ident:
push ebp
mov ebp, esp
CPU 586
mov eax, 0x01
cpuid
CPU 486
;info we want is in the eax register
leave
ret
;get the cpu vendor
global cpu_vendor
cpu_vendor:
push ebp
mov ebp, esp
CPU 586
mov eax, 0
cpuid
CPU 486
;good enough
mov eax, ebx
leave
ret
global enable_A20
enable_A20:
;cli
call a20wait
mov al,0xAD
out 0x64,al
call a20wait
mov al,0xD0
out 0x64,al
call a20wait2
in al,0x60
push eax
call a20wait
mov al,0xD1
out 0x64,al
call a20wait
pop eax
or al,2
out 0x60,al
call a20wait
mov al,0xAE
out 0x64,al
call a20wait
;sti
ret
a20wait:
in al,0x64
test al,2
jnz a20wait
ret
a20wait2:
in al,0x64
test al,1
jz a20wait2
ret
;I don't have time to implement all this shit if its not going to work
;thats why im making this happen for all errors
generic_error:
mov al, 'F'
mov ah, 0x04
mov [0xB8936], ax
mov al, 'U'
mov ah, 0x04
mov [0xB8938], ax
mov al, 'C'
mov ah, 0x04
mov [0xB893A], ax
mov al, 'K'
mov ah, 0x04
mov [0xB893C], ax
hlt
ret
;trigger interrupt 3 and hopefully trigger an arbitrary breakpoint
global insert_breakpoint_asm
insert_breakpoint_asm:
push ebp
mov ebp, esp
int 3
leave
ret
Invalid_TSS:
ret
;sets up the ldt and then fucks off
setupldt:
;put address of error subroutine
mov eax, generic_error
mov [Invalid_TSS_INT], ax
mov cl, 16
sar eax, cl
mov [Invalid_TSS_INT+6], ax
lidt [top_idt] ;load gdt settings
ret
;Now for the idt
;you need interrupts to work since exceptions are interrupts
idt:
dq 0x00
Invalid_TSS_INT:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT1:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT2:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT3:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT4:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT5:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT6:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT7:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT8:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT9:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT10:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT11:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT12:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT13:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT14:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT15:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
Invalid_TSS_INT16:
;each entry is 64 bits (damn lol what a pain)
dw 0x00 ;offset bits 0-15
dw 0x10 ;segment selector 16 bits
dw 0xEE00 ;bits32-39 reserved. bits 40-43 gate type. bit 45-46 dpl. bit 47 present bit
dw 0x00 ;offset bits 16-31
end_of_idt:
top_idt:
dw end_of_idt - idt - 1
dd idt
%include "drivers/vgadriver.asm"