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#
# Copyright (C) 2005 Ondrej Palkovsky
# 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.
#


#  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

#include <arch/pm.h>
#include <arch/context_offset.h>
#include <arch/mm/page.h>
    
.text
.global interrupt_handlers
.global syscall_entry
.global panic_printf

panic_printf:
    movq $halt, (%rsp)
    jmp printf

.global memcpy
memcpy:
    jmp _memcpy
    
.global cpuid
.global has_cpuid
.global rdtsc
.global read_efer_flag
.global set_efer_flag
    
## Determine CPUID support
#
# Return 0 in EAX if CPUID is not support, 1 if supported.
#
has_cpuid:
    pushfq          # store flags
    popq %rax       # read flags
    movq %rax,%rdx      # copy flags
    btcl $21,%edx       # swap the ID bit
    pushq %rdx
    popfq           # propagate the change into flags
    pushfq
    popq %rdx       # read flags    
    andl $(1<<21),%eax  # interested only in ID bit
    andl $(1<<21),%edx
    xorl %edx,%eax      # 0 if not supported, 1 if supported
    ret

cpuid:
    movq %rbx, %r10  # we have to preserve rbx across function calls

    movl %edi,%eax  # load the command into %eax

    cpuid   
    movl %eax,0(%rsi)
    movl %ebx,4(%rsi)
    movl %ecx,8(%rsi)
    movl %edx,12(%rsi)

    movq %r10, %rbx
    ret

rdtsc:
    xorq %rax,%rax
    rdtsc
    ret

set_efer_flag:
    movq $0xc0000080, %rcx
    rdmsr
    btsl %edi, %eax
    wrmsr
    ret
    
read_efer_flag: 
    movq $0xc0000080, %rcx
    rdmsr
    ret         

# Push all general purpose registers on stack except %rbp, %rsp
.macro save_all_gpr
    movq %rbp, IOFFSET_RBP(%rsp)
    movq %rax, IOFFSET_RAX(%rsp)
    movq %rbx, IOFFSET_RBX(%rsp)
    movq %rcx, IOFFSET_RCX(%rsp)
    movq %rdx, IOFFSET_RDX(%rsp)
    movq %rsi, IOFFSET_RSI(%rsp)
    movq %rdi, IOFFSET_RDI(%rsp)
    movq %r8, IOFFSET_R8(%rsp)
    movq %r9, IOFFSET_R9(%rsp)
    movq %r10, IOFFSET_R10(%rsp)
    movq %r11, IOFFSET_R11(%rsp)
    movq %r12, IOFFSET_R12(%rsp)
    movq %r13, IOFFSET_R13(%rsp)
    movq %r14, IOFFSET_R14(%rsp)
    movq %r15, IOFFSET_R15(%rsp)
.endm

.macro restore_all_gpr
    movq IOFFSET_RBP(%rsp), %rbp
    movq IOFFSET_RAX(%rsp), %rax
    movq IOFFSET_RBX(%rsp), %rbx
    movq IOFFSET_RCX(%rsp), %rcx
    movq IOFFSET_RDX(%rsp), %rdx
    movq IOFFSET_RSI(%rsp), %rsi
    movq IOFFSET_RDI(%rsp), %rdi
    movq IOFFSET_R8(%rsp), %r8
    movq IOFFSET_R9(%rsp), %r9
    movq IOFFSET_R10(%rsp), %r10
    movq IOFFSET_R11(%rsp), %r11
    movq IOFFSET_R12(%rsp), %r12
    movq IOFFSET_R13(%rsp), %r13
    movq IOFFSET_R14(%rsp), %r14
    movq IOFFSET_R15(%rsp), %r15
.endm
    
## 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
    subq $IREGISTER_SPACE, %rsp
    save_all_gpr

    movq $(\i),%rdi   # %rdi - first parameter
    movq %rsp, %rsi   # %rsi - pointer to interrupt_context
    call exc_dispatch   # exc_dispatch(i, stack)

# 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
    restore_all_gpr
    # $8 = Skip error word
    addq $IREGISTER_SPACE + 0x8, %rsp
    iretq

0:
# Return with no error word
    restore_all_gpr
    addq $IREGISTER_SPACE, %rsp
    iretq

    .if (\n-\i)-1
    handler "(\i+1)",\n
    .endif
.endm
    
interrupt_handlers:
h_start:
    handler 0 IDT_ITEMS
h_end:

    
syscall_entry:
    # Switch to hidden gs   
    swapgs
    # %gs:0 now points to pointer to stack page
    mov %gs:0, %r10     # We have a ptr to stack page in r10
    addq $PAGE_SIZE-16, %r10 # We need some space to store old %sp
    
    movq %rsp, 0(%r10)  # Save old stack pointer to stack
    movq %r10, %rsp     # Change to new stack
    pushq %rcx          # Return address
    pushq %r11          # Save flags

    # Switch back to remain consistent
    swapgs 

    sti
    movq %r9, %rcx      # Exchange last parameter as a third
    call syscall_handler
    cli                 # We will be touching stack pointer
        
    popq %r11
    popq %rcx
    movq 0(%rsp), %rsp
    sysretq
        
.data
.global interrupt_handler_size

interrupt_handler_size: .quad (h_end-h_start)/IDT_ITEMS