Initial commit

kernel/cpu/interrupt.S

@@ -0,0 +1,426 @@
+.code32
+# Defined in isr.c
+#MISMATCH: "[extern isr_handler]"
+#MISMATCH: "[extern irq_handler]"
+
+# Common ISR code
+isr_common_stub: 
+    # 1. Save CPU state
+        pusha # Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax
+        movw %ds,%ax # Lower 16-bits of eax = ds.
+        pushl %eax # save the data segment descriptor
+        movw $0x10,%ax # kernel data segment descriptor
+        movw %ax,%ds
+        movw %ax,%es
+        movw %ax,%fs
+        movw %ax,%gs
+
+    # 2. Call C handler
+        call isr_handler
+
+    # 3. Restore state
+        popl %eax
+        movw %ax,%ds
+        movw %ax,%es
+        movw %ax,%fs
+        movw %ax,%gs
+        popa
+        addl $8,%esp # Cleans up the pushed error code and pushed ISR number
+        sti
+        iret # pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP
+
+# Common IRQ code. Identical to ISR code except for the 'call'
+# and the 'pop ebx'
+irq_common_stub: 
+    pusha
+    movw %ds,%ax
+    pushl %eax
+    movw $0x10,%ax
+    movw %ax,%ds
+    movw %ax,%es
+    movw %ax,%fs
+    movw %ax,%gs
+    call irq_handler # Different than the ISR code
+    popl %ebx # Different than the ISR code
+    movw %bx,%ds
+    movw %bx,%es
+    movw %bx,%fs
+    movw %bx,%gs
+    popa
+    addl $8,%esp
+    sti
+    iret
+
+# We don't get information about which interrupt was caller
+# when the handler is run, so we will need to have a different handler
+# for every interrupt.
+# Furthermore, some interrupts push an error code onto the stack but others
+# don't, so we will push a dummy error code for those which don't, so that
+# we have a consistent stack for all of them.
+
+# First make the ISRs global
+.global isr0
+.global isr1
+.global isr2
+.global isr3
+.global isr4
+.global isr5
+.global isr6
+.global isr7
+.global isr8
+.global isr9
+.global isr10
+.global isr11
+.global isr12
+.global isr13
+.global isr14
+.global isr15
+.global isr16
+.global isr17
+.global isr18
+.global isr19
+.global isr20
+.global isr21
+.global isr22
+.global isr23
+.global isr24
+.global isr25
+.global isr26
+.global isr27
+.global isr28
+.global isr29
+.global isr30
+.global isr31
+
+.global irq0
+.global irq1
+.global irq2
+.global irq3
+.global irq4
+.global irq5
+.global irq6
+.global irq7
+.global irq8
+.global irq9
+.global irq10
+.global irq11
+.global irq12
+.global irq13
+.global irq14
+.global irq15
+
+# 0: Divide By Zero Exception
+isr0: 
+    cli
+    push $0
+    push $0
+    jmp isr_common_stub
+
+# 1: Debug Exception
+isr1: 
+    cli
+    push $0
+    push $1
+    jmp isr_common_stub
+
+# 2: Non Maskable Interrupt Exception
+isr2: 
+    cli
+    push $0
+    push $2
+    jmp isr_common_stub
+
+# 3: Int 3 Exception
+isr3: 
+    cli
+    push $0
+    push $3
+    jmp isr_common_stub
+
+# 4: INTO Exception
+isr4: 
+    cli
+    push $0
+    push $4
+    jmp isr_common_stub
+
+# 5: Out of Bounds Exception
+isr5: 
+    cli
+    push $0
+    push $5
+    jmp isr_common_stub
+
+# 6: Invalid Opcode Exception
+isr6: 
+    cli
+    push $0
+    push $6
+    jmp isr_common_stub
+
+# 7: Coprocessor Not Available Exception
+isr7: 
+    cli
+    push $0
+    push $7
+    jmp isr_common_stub
+
+# 8: Double Fault Exception (With Error Code!)
+isr8: 
+    cli
+    push $8
+    jmp isr_common_stub
+
+# 9: Coprocessor Segment Overrun Exception
+isr9: 
+    cli
+    push $0
+    push $9
+    jmp isr_common_stub
+
+# 10: Bad TSS Exception (With Error Code!)
+isr10: 
+    cli
+    push $10
+    jmp isr_common_stub
+
+# 11: Segment Not Present Exception (With Error Code!)
+isr11: 
+    cli
+    push $11
+    jmp isr_common_stub
+
+# 12: Stack Fault Exception (With Error Code!)
+isr12: 
+    cli
+    push $12
+    jmp isr_common_stub
+
+# 13: General Protection Fault Exception (With Error Code!)
+isr13: 
+    cli
+    push $13
+    jmp isr_common_stub
+
+# 14: Page Fault Exception (With Error Code!)
+isr14: 
+    cli
+    push $14
+    jmp isr_common_stub
+
+# 15: Reserved Exception
+isr15: 
+    cli
+    push $0
+    push $15
+    jmp isr_common_stub
+
+# 16: Floating Point Exception
+isr16: 
+    cli
+    push $0
+    push $16
+    jmp isr_common_stub
+
+# 17: Alignment Check Exception
+isr17: 
+    cli
+    push $0
+    push $17
+    jmp isr_common_stub
+
+# 18: Machine Check Exception
+isr18: 
+    cli
+    push $0
+    push $18
+    jmp isr_common_stub
+
+# 19: Reserved
+isr19: 
+    cli
+    push $0
+    push $19
+    jmp isr_common_stub
+
+# 20: Reserved
+isr20: 
+    cli
+    push $0
+    push $20
+    jmp isr_common_stub
+
+# 21: Reserved
+isr21: 
+    cli
+    push $0
+    push $21
+    jmp isr_common_stub
+
+# 22: Reserved
+isr22: 
+    cli
+    push $0
+    push $22
+    jmp isr_common_stub
+
+# 23: Reserved
+isr23: 
+    cli
+    push $0
+    push $23
+    jmp isr_common_stub
+
+# 24: Reserved
+isr24: 
+    cli
+    push $0
+    push $24
+    jmp isr_common_stub
+
+# 25: Reserved
+isr25: 
+    cli
+    push $0
+    push $25
+    jmp isr_common_stub
+
+# 26: Reserved
+isr26: 
+    cli
+    push $0
+    push $26
+    jmp isr_common_stub
+
+# 27: Reserved
+isr27: 
+    cli
+    push $0
+    push $27
+    jmp isr_common_stub
+
+# 28: Reserved
+isr28: 
+    cli
+    push $0
+    push $28
+    jmp isr_common_stub
+
+# 29: Reserved
+isr29: 
+    cli
+    push $0
+    push $29
+    jmp isr_common_stub
+
+# 30: Reserved
+isr30: 
+    cli
+    push $0
+    push $30
+    jmp isr_common_stub
+
+# 31: Reserved
+isr31: 
+    cli
+    push $0
+    push $31
+    jmp isr_common_stub
+
+# IRQ handlers
+irq0: 
+        cli
+        push $0
+        push $32
+        jmp irq_common_stub
+
+irq1: 
+        cli
+        push $1
+        push $33
+        jmp irq_common_stub
+
+irq2: 
+        cli
+        push $2
+        push $34
+        jmp irq_common_stub
+
+irq3: 
+        cli
+        push $3
+        push $35
+        jmp irq_common_stub
+
+irq4: 
+        cli
+        push $4
+        push $36
+        jmp irq_common_stub
+
+irq5: 
+        cli
+        push $5
+        push $37
+        jmp irq_common_stub
+
+irq6: 
+        cli
+        push $6
+        push $38
+        jmp irq_common_stub
+
+irq7: 
+        cli
+        push $7
+        push $39
+        jmp irq_common_stub
+
+irq8: 
+        cli
+        push $8
+        push $40
+        jmp irq_common_stub
+
+irq9: 
+        cli
+        push $9
+        push $41
+        jmp irq_common_stub
+
+irq10: 
+        cli
+        push $10
+        push $42
+        jmp irq_common_stub
+
+irq11: 
+        cli
+        push $11
+        push $43
+        jmp irq_common_stub
+
+irq12: 
+        cli
+        push $12
+        push $44
+        jmp irq_common_stub
+
+irq13: 
+        cli
+        push $13
+        push $45
+        jmp irq_common_stub
+
+irq14: 
+        cli
+        push $14
+        push $46
+        jmp irq_common_stub
+
+irq15: 
+        cli
+        push $15
+        push $47
+        jmp irq_common_stub
+