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// Copyright 2019 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build arm64
package ring0
// init initializes architecture-specific state.
func (k *Kernel) init(opts KernelOpts) {
// Save the root page tables.
k.PageTables = opts.PageTables
}
// init initializes architecture-specific state.
func (c *CPU) init() {
// Set the kernel stack pointer(virtual address).
c.registers.Sp = uint64(c.StackTop())
}
// StackTop returns the kernel's stack address.
//
//go:nosplit
func (c *CPU) StackTop() uint64 {
return uint64(kernelAddr(&c.stack[0])) + uint64(len(c.stack))
}
// IsCanonical indicates whether addr is canonical per the arm64 spec.
//
//go:nosplit
func IsCanonical(addr uint64) bool {
return addr <= 0x0000ffffffffffff || addr > 0xffff000000000000
}
//go:nosplit
func (c *CPU) SwitchToUser(switchOpts SwitchOpts) (vector Vector) {
// Sanitize registers.
regs := switchOpts.Registers
regs.Pstate &= ^uint64(UserFlagsClear)
regs.Pstate |= UserFlagsSet
kernelExitToEl0()
vector = c.vecCode
// Perform the switch.
return
}
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