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More advanced Fault handling (recovers to text mode), Keyboard handler converted to C and improved (shifting, simple get_key added)

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This commit is contained in:
Lucia Ceionia
2023-02-01 20:42:05 -06:00
parent 0faa2eb553
commit 679eb8cf57
9 changed files with 293 additions and 175 deletions
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172
handler.nasm
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@@ -1,61 +1,4 @@
extern unhandled_handler
unhandled_handler:
mov ax, 0x10
mov ds, ax
mov dword [0xb8000], 0x0f000f00 | 'E' | 'R' << 16
mov dword [0xb8004], 0x0f000f00 | 'R' | 'O' << 16
mov dword [0xb8008], 0x0f000f00 | 'R' | '!' << 16
.hlt:
hlt
jmp .hlt
global pageFaultHandler
pageFaultHandler:
mov ax, 0x10
mov ds, ax
pop eax ; error code
mov ebx, 0x0f000f00 | '0' | '!' << 16
and eax, 0x7 ; U/S,R/W,P
add ebx, eax
mov dword [0xb8000], 0x0f000f00 | 'P' | 'G' << 16
mov dword [0xb8004], 0x0f000f00 | 'F' | 'L' << 16
mov dword [0xb8008], 0x0f000f00 | 'T' | ':' << 16
mov dword [0xb800C], ebx
.hlt:
hlt
jmp .hlt
extern gpf_handler_v86
global gpfHandler
gpfHandler:
push eax
mov ax, 0x10
mov ds, ax
mov eax, dword [esp+16] ; EFLAGS
and eax, 1 << 17 ; VM flag
test eax, eax
pop eax
jnz gpf_handler_v86
jmp gpf_handler_32
gpf_unhandled:
mov dword [0xb8000], 0x0f000f00 | 'G' | 'P' << 16
mov dword [0xb8004], 0x0f000f00 | 'F' | '!' << 16
.hlt:
hlt
jmp .hlt
gpf_handler_32:
push eax
mov eax, dword [esp+8] ; EIP
movzx eax, word [eax]
cmp eax, 0x30CD ; int 0x30
jne gpf_unhandled
pop eax ; return value
jmp return_prev_task
extern return_prev_task
scancodesToAscii: db 0, 0 ; 0x00 - 0x01
oldscancodesToAscii: db 0, 0 ; 0x00 - 0x01
db "1234567890" ; 0x02 - 0x0B
db "-=" ; 0x0C - 0x0D
db 0, 0 ; 0x0E - 0x0F
@@ -71,8 +14,8 @@ db ' ' ; 0x39
db 'C'
scancodesToAsciiEnd:
cursorCurrent: dd 0xb8000 + (80*6*2)
global keyboardHandler
keyboardHandler:
global oldkeyboardHandler
oldkeyboardHandler:
push eax
push ebx
push ds
@@ -82,7 +25,7 @@ xor eax, eax
in al, 0x60
cmp eax, 0x3A
jg .done
mov al, [scancodesToAscii+eax]
mov al, [oldscancodesToAscii+eax]
test al, al
jz .done
mov ebx, [cursorCurrent]
@@ -98,8 +41,7 @@ pop eax
iret
KBDWAIT: db 0
global kbd_wait
kbd_wait:
oldkbd_wait:
mov byte [KBDWAIT], 0
.loop:
hlt
@@ -108,13 +50,15 @@ test eax, eax
jz .loop
ret
TIMERVAL: dd 0
global timerHandler
timerHandler:
push eax
push ds
mov ax, 0x10
mov ds, ax
inc byte [(0xb8000 + (80*8*2))]
;inc byte [(0xb8000 + (80*8*2))]
inc dword [TIMERVAL]
mov al, 0x20
out 0x20, al
pop ds
@@ -159,103 +103,3 @@ jmp $+2
jmp $+2
out 0xA1, al
ret
global divisionErrorHandler
divisionErrorHandler:
mov ax, 0x10
mov ds, ax
mov dword [0xb8000], 0x0f000f00 | '#' | 'D' << 16
mov dword [0xb8004], 0x0f000f00 | 'E' | '!' << 16
.hlt:
hlt
jmp .hlt
global boundRangeHandler
boundRangeHandler:
mov ax, 0x10
mov ds, ax
mov dword [0xb8000], 0x0f000f00 | '#' | 'B' << 16
mov dword [0xb8004], 0x0f000f00 | 'R' | '!' << 16
.hlt:
hlt
jmp .hlt
global invalidOpcodeHandler
invalidOpcodeHandler:
mov ax, 0x10
mov ds, ax
mov dword [0xb8000], 0x0f000f00 | '#' | 'U' << 16
mov dword [0xb8004], 0x0f000f00 | 'D' | '!' << 16
.hlt:
hlt
jmp .hlt
global deviceNotAvailableHandler
deviceNotAvailableHandler:
mov ax, 0x10
mov ds, ax
mov dword [0xb8000], 0x0f000f00 | '#' | 'N' << 16
mov dword [0xb8004], 0x0f000f00 | 'D' | '!' << 16
.hlt:
hlt
jmp .hlt
global doubleFaultHandler
doubleFaultHandler:
mov ax, 0x10
mov ds, ax
mov dword [0xb8000], 0x0f000f00 | '#' | 'D' << 16
mov dword [0xb8004], 0x0f000f00 | 'F' | '!' << 16
.hlt:
hlt
jmp .hlt
global invalidTSSHandler
invalidTSSHandler:
mov ax, 0x10
mov ds, ax
mov dword [0xb8000], 0x0f000f00 | '#' | 'T' << 16
mov dword [0xb8004], 0x0f000f00 | 'S' | '!' << 16
.hlt:
hlt
jmp .hlt
global segmentNotPresentHandler
segmentNotPresentHandler:
mov ax, 0x10
mov ds, ax
mov dword [0xb8000], 0x0f000f00 | '#' | 'N' << 16
mov dword [0xb8004], 0x0f000f00 | 'P' | '!' << 16
.hlt:
hlt
jmp .hlt
global stackSegmentHandler
stackSegmentHandler:
mov ax, 0x10
mov ds, ax
mov dword [0xb8000], 0x0f000f00 | '#' | 'S' << 16
mov dword [0xb8004], 0x0f000f00 | 'S' | '!' << 16
.hlt:
hlt
jmp .hlt
global x87FloatingHandler
x87FloatingHandler:
mov ax, 0x10
mov ds, ax
mov dword [0xb8000], 0x0f000f00 | '#' | 'M' << 16
mov dword [0xb8004], 0x0f000f00 | 'F' | '!' << 16
.hlt:
hlt
jmp .hlt
global alignmentCheckHandler
alignmentCheckHandler:
mov ax, 0x10
mov ds, ax
mov dword [0xb8000], 0x0f000f00 | '#' | 'A' << 16
mov dword [0xb8004], 0x0f000f00 | 'C' | '!' << 16
.hlt:
hlt
jmp .hlt
global controlProtectionHandler
controlProtectionHandler:
mov ax, 0x10
mov ds, ax
mov dword [0xb8000], 0x0f000f00 | '#' | 'C' << 16
mov dword [0xb8004], 0x0f000f00 | 'P' | '!' << 16
.hlt:
hlt
jmp .hlt