#
# Copyright (C) 2001-2004 Jakub Jermar
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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## very low and hardware-level functions

#  Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int has no error word
# and 1 means interrupt with error word
#define ERROR_WORD_INTERRUPT_LIST 0x00027D00

.text

.global paging_on
.global enable_l_apic_in_msr
.global interrupt_handlers

## Turn paging on
#
# Enable paging and write-back caching in CR0.
#
paging_on:
	movl %cr0,%edx
	orl $(1<<31),%edx		# paging on
	andl $~((1<<30)|(1<<29)),%edx	# clear Cache Disable and not Write Though
	movl %edx,%cr0
	jmp 0f
0:
	ret


## Enable local APIC
#
# Enable local APIC in MSR.
#
enable_l_apic_in_msr:
	push %eax

	movl $0x1b, %ecx
	rdmsr
	orl $(1<<11),%eax
	orl $(0xfee00000),%eax
	wrmsr

	pop %eax
	ret


## Declare interrupt handlers
#
# Declare interrupt handlers for n interrupt
# vectors starting at vector i.
#
# The handlers setup data segment registers
# and call exc_dispatch().
#
.macro handler i n
	push %ebp
	movl %esp,%ebp
	pusha

	push %ds
	push %es

	# we must fill the data segment registers
	movw $16,%ax
	movw %ax,%ds
	movw %ax,%es

	movl $(\i),%edi
	pushl %ebp
	addl $4,(%esp)
	pushl %edi
	call exc_dispatch
	addl $8,%esp

	pop %es
	pop %ds


# CLNT
	pushfl
	pop %eax
	and $0xFFFFBFFF,%eax
	push %eax
	popfl
	


# Test if this is interrupt with error word or not
	mov $\i,%cl
	movl $1,%eax
	test $0xe0,%cl
	jnz 0f
	and $0x1f,%cl
	shl %cl,%eax
	and $ERROR_WORD_INTERRUPT_LIST,%eax
	jz 0f


# Return with error word
	popa
	pop %ebp
	add $4,%esp	# Skip error word
	iret

0:
# Return with no error word
	popa
	pop %ebp
	iret

	.if (\n-\i)-1
	handler "(\i+1)",\n
	.endif
.endm

# keep in sync with pm.h !!!
IDT_ITEMS=64
interrupt_handlers:
h_start:
	handler 0 64
#	handler 64 128	
#	handler 128 192
#	handler 192 256
h_end:

.data
.global interrupt_handler_size

interrupt_handler_size: .long (h_end-h_start)/IDT_ITEMS