github.com/transparency-dev/armored-witness-os@v0.1.3-0.20240514084412-27eef7325168/trusted_os/dma.go (about)

     1  // Copyright 2022 The Armored Witness OS authors. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package main
    16  
    17  import (
    18  	"github.com/usbarmory/tamago/dma"
    19  	"github.com/usbarmory/tamago/soc/nxp/imx6ul"
    20  )
    21  
    22  var appletRegion *dma.Region
    23  
    24  func init() {
    25  	appletRegion, _ = dma.NewRegion(appletStart, appletSize, false)
    26  	appletRegion.Reserve(appletSize, 0)
    27  
    28  	dma.Init(secureDMAStart, secureDMASize)
    29  
    30  	deriveKeyMemory, _ := dma.NewRegion(imx6ul.OCRAM_START, imx6ul.OCRAM_SIZE, false)
    31  
    32  	switch {
    33  	case imx6ul.CAAM != nil:
    34  		imx6ul.CAAM.DeriveKeyMemory = deriveKeyMemory
    35  	case imx6ul.DCP != nil:
    36  		imx6ul.DCP.DeriveKeyMemory = deriveKeyMemory
    37  	}
    38  }