Got IDT & ISRs working!

2025-03-21 14:09:15 +01:00
parent 05c8ee8f67
commit c3f8d7d8f2
9 changed files with 322 additions and 2 deletions
@@ -0,0 +1,119 @@
+; ISR Assembly
+[bits 32]
+
+isr_common:
+	;; Push registers to the intFrame_t struct
+	push eax
+	push gs
+	push fs
+	push es
+	push ds
+	push ebp
+	push edi
+	push esi
+	push edx
+	push ecx
+	push ebx
+	push esp
+	
+	[extern isr_handleInterrupt]
+	call isr_handleInterrupt
+isr_return:
+	add esp, 4  ; Keep ESP
+	pop ebx
+	pop ecx
+	pop edx
+	pop esi
+	pop edi
+	pop ebp
+	pop ds
+	pop es
+	pop fs
+	pop gs
+	add esp, 4  ; Keep EAX
+	add esp, 8  ; Pop interupt number and error code
+
+	iretd   ; Pop CS, EIP & EFLAGS (Also SS & ESP if it's from userspace)
+
+%macro ISR_WITH_ERRNO 1
+isr%1:
+	push dword %1
+	jmp isr_common
+%endmacro
+	
+%macro ISR_WITHOUT_ERRNO 1
+isr%1:
+	push dword 0	; Instead of error code
+	push dword %1
+	jmp isr_common
+%endmacro
+
+;; Exceptions
+ISR_WITHOUT_ERRNO	0
+ISR_WITHOUT_ERRNO	1
+ISR_WITHOUT_ERRNO	2
+ISR_WITHOUT_ERRNO	3
+ISR_WITHOUT_ERRNO	4
+ISR_WITHOUT_ERRNO	5
+ISR_WITHOUT_ERRNO	6
+ISR_WITHOUT_ERRNO	7
+ISR_WITH_ERRNO		8
+ISR_WITHOUT_ERRNO	9
+ISR_WITH_ERRNO		10
+ISR_WITH_ERRNO		11
+ISR_WITH_ERRNO		12
+ISR_WITH_ERRNO		13
+ISR_WITH_ERRNO		14
+ISR_WITHOUT_ERRNO 	15
+ISR_WITHOUT_ERRNO 	16
+ISR_WITHOUT_ERRNO	17
+ISR_WITHOUT_ERRNO	18
+ISR_WITHOUT_ERRNO	19
+ISR_WITHOUT_ERRNO	20
+ISR_WITHOUT_ERRNO	21
+ISR_WITHOUT_ERRNO	22
+ISR_WITHOUT_ERRNO	23
+ISR_WITHOUT_ERRNO	24
+ISR_WITHOUT_ERRNO	25
+ISR_WITHOUT_ERRNO	26
+ISR_WITHOUT_ERRNO	27
+ISR_WITHOUT_ERRNO	28
+ISR_WITHOUT_ERRNO	29
+ISR_WITHOUT_ERRNO	30
+ISR_WITHOUT_ERRNO	31
+
+;; IRQs 0-15 (mapped 32-47)
+ISR_WITHOUT_ERRNO	32
+ISR_WITHOUT_ERRNO	33
+ISR_WITHOUT_ERRNO	34
+ISR_WITHOUT_ERRNO	35
+ISR_WITHOUT_ERRNO	36
+ISR_WITHOUT_ERRNO	37
+ISR_WITHOUT_ERRNO	38
+ISR_WITHOUT_ERRNO	39
+ISR_WITHOUT_ERRNO	40
+ISR_WITHOUT_ERRNO	41
+ISR_WITHOUT_ERRNO	42
+ISR_WITHOUT_ERRNO	43
+ISR_WITHOUT_ERRNO	44
+ISR_WITHOUT_ERRNO	45
+ISR_WITHOUT_ERRNO	46
+ISR_WITHOUT_ERRNO	47
+
+;; Syscall ISR128
+[global isr128]
+isr128:
+	cli	; Prevent race condition & other issues
+	push dword 0
+	push dword 128
+	jmp isr_common
+
+;; Create table of ISRs
+[global isr_redirectTable]
+isr_redirectTable:
+%assign i 0
+%rep 48
+	dd isr%+i
+%assign i i+1
+%endrep
+