github.com/transparency-dev/armored-witness-applet@v0.1.1/trusted_applet/mem_bee.go (about)

     1  // Copyright 2022 The Armored Witness Applet 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  //go:build bee
    16  // +build bee
    17  
    18  package main
    19  
    20  import (
    21  	_ "unsafe"
    22  )
    23  
    24  // The following memory region is within an alias of external DDR, required
    25  // when memory encryption is enforced by the i.MX6UL Bus Encryption Engine
    26  // (BEE).
    27  const (
    28  	appletStart = 0x20000000
    29  	appletSize  = 0x10000000 // 256MB
    30  )
    31  
    32  //go:linkname ramStart runtime.ramStart
    33  var ramStart uint32 = appletStart
    34  
    35  //go:linkname ramSize runtime.ramSize
    36  var ramSize uint32 = appletSize
    37  
    38  //go:linkname ramStackOffset runtime.ramStackOffset
    39  var ramStackOffset uint32 = 0x100