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#
# 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
.global inb
.global inw
.global inl
.global outb
.global outw
.global outl
.global memcopy
.global memsetb
.global memsetw
.global memcmp


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


## Enable local APIC
#
# Enable local APIC in MSR.
#
enable_l_apic_in_msr:
    pusha
    
    movl $0x1b, %ecx
    rdmsr
    orl $(1<<11),%eax
    orl $(0xfee00000),%eax
    wrmsr
    
    popa
    ret


## Declare interrupt handlers
#
# Declare interrupt handlers for n interrupt
# vectors starting at vector i.
#
# The handlers setup data segment registers
# and call trap_dispatcher().
#
.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 trap_dispatcher
    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:


## I/O input (byte)
#
# Get a byte from I/O port and store it AL.
#
inb:
    push %edx
    xorl %eax,%eax
    movl 8(%esp),%edx
    inb %dx,%al
    pop %edx
    ret


## I/O input (word)
#
# Get a word from I/O port and store it AX.
#
inw:
    push %edx
    xorl %eax,%eax
    movl 8(%esp),%edx
    inw %dx,%ax
    pop %edx
    ret


## I/O input (dword)
#
# Get a dword from I/O port and store it EAX.
#
inl:
    push %edx
    xorl %eax,%eax
    movl 8(%esp),%edx
    inl %dx,%eax
    pop %edx
    ret


## I/O output (byte)
#
# Send a byte to I/O port.
#
outb:
    push %ebp
    movl %esp,%ebp
    pusha

    movl 8(%ebp),%edx
    movl 12(%ebp),%eax
    outb %al,%dx

    popa
    pop %ebp
    ret


## I/O output (word)
#
# Send a word to I/O port.
#
outw:
    push %ebp
    movl %esp,%ebp
    pusha

    movl 8(%ebp),%edx
    movl 12(%ebp),%eax
    outw %ax,%dx

    popa
    pop %ebp
    ret


## I/O output (dword)
#
# Send a dword to I/O port.
#
outl:
    push %ebp
    movl %esp,%ebp
    pusha

    movl 8(%ebp),%edx
    movl 12(%ebp),%eax
    outl %eax,%dx

    popa
    pop %ebp
    ret


## Copy memory
#
# Copy a given number of bytes (3rd argument)
# from the memory location defined by 1st argument
# to the memory location defined by 2nd argument.
# The memory areas cannot overlap.
#
SRC=12
DST=8
CNT=16
memcopy:
    push %ebp
    movl %esp,%ebp
    pusha

    cld
    movl CNT(%ebp),%ecx
    movl DST(%ebp),%edi
    movl SRC(%ebp),%esi

    rep movsb %ds:(%esi),%es:(%edi)

    popa
    pop %ebp
    ret


## Fill memory with bytes
#
# Fill a given number of bytes (2nd argument)
# at memory defined by 1st argument with the
# byte value defined by 3rd argument.
#
DST=8
CNT=12
X=16
memsetb:
    push %ebp
    movl %esp,%ebp
    pusha

    cld
    movl CNT(%ebp),%ecx
    movl DST(%ebp),%edi
    movl X(%ebp),%eax

    rep stosb %al,%es:(%edi)

    popa
    pop %ebp
    ret


## Fill memory with words
#
# Fill a given number of words (2nd argument)
# at memory defined by 1st argument with the
# word value defined by 3rd argument.
#
DST=8
CNT=12
X=16
memsetw:
    push %ebp
    movl %esp,%ebp
    pusha

    cld
    movl CNT(%ebp),%ecx
    movl DST(%ebp),%edi
    movl X(%ebp),%eax

    rep stosw %ax,%es:(%edi)

    popa
    pop %ebp
    ret


## Compare memory regions for equality
#
# Compare a given number of bytes (3rd argument)
# at memory locations defined by 1st and 2nd argument
# for equality. If the bytes are equal, EAX contains
# 0.
#
SRC=12
DST=16
CNT=20
memcmp:
    push %ebp
    subl $4,%esp    
    movl %esp,%ebp

    pusha

    cld
    movl CNT(%ebp),%ecx
    movl DST(%ebp),%edi
    movl SRC(%ebp),%esi

    repe cmpsb %es:(%edi),%ds:(%esi)
    movl %ecx,(%ebp)

    popa
    
    movl (%ebp),%eax    # return value => %eax (zero on success)
    addl $4,%esp
    pop %ebp
    
    ret


# THIS IS USERSPACE CODE
.global utext
utext:
    xor %ax,%ax;
    mov %ax,%ds;
    mov %ax,%es;
    mov %ax,%fs;
    mov %ax,%gs;
0:
    int $48
    jmp 0b
    # not reached
utext_end:

.data
.global utext_size
utext_size:
    .long utext_end - utext 


#.section K_DATA_START
.global interrupt_handler_size

interrupt_handler_size: .long (h_end-h_start)/IDT_ITEMS