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// Copyright 2018 The gVisor Authors.
//
// 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.
package ring0
import (
"gvisor.dev/gvisor/pkg/sentry/arch/fpu"
)
// Init initializes a new kernel.
//
//go:nosplit
func (k *Kernel) Init(maxCPUs int) {
k.init(maxCPUs)
}
// Halt halts execution.
func Halt()
// defaultHooks implements hooks.
type defaultHooks struct{}
// KernelSyscall implements Hooks.KernelSyscall.
//
// +checkescape:all
//
//go:nosplit
func (defaultHooks) KernelSyscall() {
Halt()
}
// KernelException implements Hooks.KernelException.
//
// +checkescape:all
//
//go:nosplit
func (defaultHooks) KernelException(Vector) {
Halt()
}
// kernelSyscall is a trampoline.
//
// When in amd64, it is called with %rip on the upper half, so it can
// NOT access to any global data which is not mapped on upper and must
// call to function pointers or interfaces to switch to the lower half
// so that callee can access to global data.
//
// +checkescape:hard,stack
//
//go:nosplit
func kernelSyscall(c *CPU) {
c.hooks.KernelSyscall()
}
// kernelException is a trampoline.
//
// When in amd64, it is called with %rip on the upper half, so it can
// NOT access to any global data which is not mapped on upper and must
// call to function pointers or interfaces to switch to the lower half
// so that callee can access to global data.
//
// +checkescape:hard,stack
//
//go:nosplit
func kernelException(c *CPU, vector Vector) {
c.hooks.KernelException(vector)
}
// Init initializes a new CPU.
//
// Init allows embedding in other objects.
func (c *CPU) Init(k *Kernel, cpuID int, hooks Hooks) {
c.self = c // Set self reference.
c.kernel = k // Set kernel reference.
c.init(cpuID) // Perform architectural init.
c.floatingPointState = fpu.NewState()
// Require hooks.
if hooks != nil {
c.hooks = hooks
} else {
c.hooks = defaultHooks{}
}
}
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