From 0921a33fc9f3724cb36a03a24b58b0a5bfc519b1 Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex.auvolat@ens.fr>
Date: Mon, 1 Dec 2014 17:24:38 +0100
Subject: Advance HH, GDT, IDT (details below)

- Implement higher-half in loader with paging (using 4Mb pages)
- Add GDT installation code
- Add IDT installation code (spend a loong time debugging the ISRs!)
- Add CDROM generation scripts
- Add scripts to launch bochs (debug) and qemu (debug)
---
 kernel/l0/interrupt.s | 126 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 kernel/l0/interrupt.s

(limited to 'kernel/l0/interrupt.s')

diff --git a/kernel/l0/interrupt.s b/kernel/l0/interrupt.s
new file mode 100644
index 0000000..ddd1e76
--- /dev/null
+++ b/kernel/l0/interrupt.s
@@ -0,0 +1,126 @@
+;************************************************************************************
+
+%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
+
+	; pass the register data structure as a pointer to the function
+	; (passing it directly results in GCC trashing the data when doing optimisations)
+	mov eax, esp
+	push eax
+	call idt_%1Handler
+	add esp, 4
+
+	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
+	iret
+%endmacro
+
+COMMONSTUB isr
+COMMONSTUB irq
+COMMONSTUB syscall
+
+;************************************************************************************
+
+%macro ISR_NOERRCODE 1  ; define a macro, taking one parameter
+	[GLOBAL isr%1]        ; %1 accesses the first parameter.
+	isr%1:
+		push byte 0
+		push byte %1
+		jmp isr_common_stub
+%endmacro
+
+%macro ISR_ERRCODE 1
+	[GLOBAL isr%1]
+	isr%1:
+		push byte %1
+		jmp isr_common_stub
+%endmacro
+
+%macro IRQ 2
+	[GLOBAL irq%1]
+	irq%1:
+		push byte %1	;push irq number
+		push byte %2	;push int number
+		jmp irq_common_stub
+%endmacro
+
+%macro SYSCALL 1
+	[GLOBAL syscall%1]
+	syscall%1:
+		cli
+		push byte 0
+		push byte %1
+		jmp syscall_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
+
+SYSCALL 64
+
+; vim: set ts=4 sw=4 tw=0 noet :
-- 
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