x86asm.nim

# The MIT License (MIT)
# 
# Copyright (c) 2015 Kashyap
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

proc outb* (port: uint16, value: uint8) =
  asm """
    outb %%al, %%dx
    :
    :"a"(`value`), "d"(`port`)
  """  

proc inb* (port: uint16): uint8 =
  asm """
    inb %%dx, %%al
    :"=a"(`result`)
    :"d"(`port`)
  """


proc readeflags*(): uint64 = 
  asm """
    pushf
    pop %0
   :"=r"(`result`)
   :
   """
proc cli*() =
  asm """
    cli
  """

discard readeflags()