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-rw-r--r--src/stem/task/idt_.asm143
1 files changed, 143 insertions, 0 deletions
diff --git a/src/stem/task/idt_.asm b/src/stem/task/idt_.asm
new file mode 100644
index 0000000..b73f7a5
--- /dev/null
+++ b/src/stem/task/idt_.asm
@@ -0,0 +1,143 @@
+; UNRELATED
+
+[GLOBAL gdt_flush]
+
+gdt_flush:
+ mov eax, [esp+4]
+ lgdt [eax]
+
+ mov ax, 0x10
+ mov ds, ax
+ mov es, ax
+ mov fs, ax
+ mov gs, ax
+ mov ss, ax
+ jmp 0x08:.flush
+
+.flush:
+ ret
+
+; RELATED
+
+[GLOBAL idt_flush]
+idt_flush:
+ mov eax, [esp+4] ; Get the pointer to the IDT, passed as a parameter.
+ lidt [eax] ; Load the IDT pointer.
+ ret
+
+;************************************************************************************
+
+%macro COMMONSTUB 1
+[EXTERN idt_%1Handler]
+%1_common_stub:
+ pusha ; Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax
+
+ mov ax, ds ; Lower 16-bits of eax = ds.
+ push eax ; save the data segment descriptor
+
+ mov ax, 0x10 ; load the kernel data segment descriptor
+ mov ds, ax
+ mov es, ax
+ mov fs, ax
+ mov gs, ax
+
+ mov eax, cr3
+ push eax
+
+ call idt_%1Handler
+
+ pop eax
+ mov cr3, eax
+
+ pop eax ; reload the original data segment descriptor
+ mov ds, ax
+ mov es, ax
+ mov fs, ax
+ mov gs, ax
+
+ popa ; Pops edi,esi,ebp...
+ add esp, 8 ; Cleans up the pushed error code and pushed ISR number
+ sti
+ iret
+%endmacro
+
+COMMONSTUB isr
+COMMONSTUB irq
+
+;************************************************************************************
+
+%macro ISR_NOERRCODE 1 ; define a macro, taking one parameter
+ [GLOBAL isr%1] ; %1 accesses the first parameter.
+ isr%1:
+ cli
+ push byte 0
+ push byte %1
+ jmp isr_common_stub
+%endmacro
+
+%macro ISR_ERRCODE 1
+ [GLOBAL isr%1]
+ isr%1:
+ cli
+ push byte %1
+ jmp isr_common_stub
+%endmacro
+
+%macro IRQ 2
+ [GLOBAL irq%1]
+ irq%1:
+ cli
+ push byte %1 ;push irq number
+ push byte %2 ;push int number
+ jmp irq_common_stub
+%endmacro
+
+ISR_NOERRCODE 0
+ISR_NOERRCODE 1
+ISR_NOERRCODE 2
+ISR_NOERRCODE 3
+ISR_NOERRCODE 4
+ISR_NOERRCODE 5
+ISR_NOERRCODE 6
+ISR_NOERRCODE 7
+ISR_ERRCODE 8
+ISR_NOERRCODE 9
+ISR_ERRCODE 10
+ISR_ERRCODE 11
+ISR_ERRCODE 12
+ISR_ERRCODE 13
+ISR_ERRCODE 14
+ISR_NOERRCODE 15
+ISR_NOERRCODE 16
+ISR_NOERRCODE 17
+ISR_NOERRCODE 18
+ISR_NOERRCODE 19
+ISR_NOERRCODE 20
+ISR_NOERRCODE 21
+ISR_NOERRCODE 22
+ISR_NOERRCODE 23
+ISR_NOERRCODE 24
+ISR_NOERRCODE 25
+ISR_NOERRCODE 26
+ISR_NOERRCODE 27
+ISR_NOERRCODE 28
+ISR_NOERRCODE 29
+ISR_NOERRCODE 30
+ISR_NOERRCODE 31
+
+IRQ 0, 32
+IRQ 1, 33
+IRQ 2, 34
+IRQ 3, 35
+IRQ 4, 36
+IRQ 5, 37
+IRQ 6, 38
+IRQ 7, 39
+IRQ 8, 40
+IRQ 9, 41
+IRQ 10, 42
+IRQ 11, 43
+IRQ 12, 44
+IRQ 13, 45
+IRQ 14, 46
+IRQ 15, 47