Move ring0 package.

This allows the package to serve as a general purpose ring0 support package, as
opposed to being bound to specific sentry platforms.

Updates #5039

PiperOrigin-RevId: 355220044

1 files changed, 71 insertions, 0 deletions

diff --git a/pkg/ring0/lib_arm64.go b/pkg/ring0/lib_arm64.go
new file mode 100644
index 000000000..a490bf3af
--- /dev/null
+++ b/pkg/ring0/lib_arm64.go
@@ -0,0 +1,71 @@
+// Copyright 2019 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.
+
+// +build arm64
+
+package ring0
+
+// storeAppASID writes the application's asid value.
+func storeAppASID(asid uintptr)
+
+// LocalFlushTlbAll same as FlushTlbAll, but only applies to the calling CPU.
+func LocalFlushTlbAll()
+
+// FlushTlbByVA invalidates tlb by VA/Last-level/Inner-Shareable.
+func FlushTlbByVA(addr uintptr)
+
+// FlushTlbByASID invalidates tlb by ASID/Inner-Shareable.
+func FlushTlbByASID(asid uintptr)
+
+// FlushTlbAll invalidates all tlb.
+func FlushTlbAll()
+
+// CPACREL1 returns the value of the CPACR_EL1 register.
+func CPACREL1() (value uintptr)
+
+// GetFPCR returns the value of FPCR register.
+func GetFPCR() (value uintptr)
+
+// SetFPCR writes the FPCR value.
+func SetFPCR(value uintptr)
+
+// GetFPSR returns the value of FPSR register.
+func GetFPSR() (value uintptr)
+
+// SetFPSR writes the FPSR value.
+func SetFPSR(value uintptr)
+
+// SaveVRegs saves V0-V31 registers.
+// V0-V31: 32 128-bit registers for floating point and simd.
+func SaveVRegs(*byte)
+
+// LoadVRegs loads V0-V31 registers.
+func LoadVRegs(*byte)
+
+// LoadFloatingPoint loads floating point state.
+func LoadFloatingPoint(*byte)
+
+// SaveFloatingPoint saves floating point state.
+func SaveFloatingPoint(*byte)
+
+// EnableVFP enables fpsimd.
+func EnableVFP()
+
+// DisableVFP disables fpsimd.
+func DisableVFP()
+
+// Init sets function pointers based on architectural features.
+//
+// This must be called prior to using ring0.
+func Init() {}