source: mainline/arch/ia32/src/asm.S@ 25d7709

#
# 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
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

## 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 %eax

        # Test if this is interrupt with error word or not
        movl $(1<<\i), %eax
        andl $ERROR_WORD_INTERRUPT_LIST,%eax

        /*
         * If this interrupt/exception  stores error word,
         * we need to pop EAX.
         * If this interrupt doesn't store error word, we emulate it
         * for the sake of consistent pstate structure. In that case
         * we merely leave the EAX on the stack.
         */
        jz 0f

        /*
         * This exception stores error word.
         */
        pop %eax
        jmp 1f

0:
        /*
         * This interrupt doesn't store error word.
         * Just restore EAX without doing POP.
         */
        movl (%esp), %eax

1:
        pusha
        movl %esp, %ebp
        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
        pushl %edi
        call exc_dispatch
        addl $8,%esp

        pop %es
        pop %ds

# Clear Nested Task flag.
        pushfl
        pop %eax
        and $0xFFFFBFFF,%eax
        push %eax
        popfl
        
        popa
        add $4,%esp     # Skip error word, whether real or fake.
        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