forked from toolshed/abra
51 lines
1.4 KiB
Go
51 lines
1.4 KiB
Go
// Copyright 2022 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
//go:build loong64
|
|
|
|
package cpu
|
|
|
|
const cacheLineSize = 64
|
|
|
|
// Bit fields for CPUCFG registers, Related reference documents:
|
|
// https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#_cpucfg
|
|
const (
|
|
// CPUCFG1 bits
|
|
cpucfg1_CRC32 = 1 << 25
|
|
|
|
// CPUCFG2 bits
|
|
cpucfg2_LAM_BH = 1 << 27
|
|
cpucfg2_LAMCAS = 1 << 28
|
|
)
|
|
|
|
func initOptions() {
|
|
options = []option{
|
|
{Name: "lsx", Feature: &Loong64.HasLSX},
|
|
{Name: "lasx", Feature: &Loong64.HasLASX},
|
|
{Name: "crc32", Feature: &Loong64.HasCRC32},
|
|
{Name: "lam_bh", Feature: &Loong64.HasLAM_BH},
|
|
{Name: "lamcas", Feature: &Loong64.HasLAMCAS},
|
|
}
|
|
|
|
// The CPUCFG data on Loong64 only reflects the hardware capabilities,
|
|
// not the kernel support status, so features such as LSX and LASX that
|
|
// require kernel support cannot be obtained from the CPUCFG data.
|
|
//
|
|
// These features only require hardware capability support and do not
|
|
// require kernel specific support, so they can be obtained directly
|
|
// through CPUCFG
|
|
cfg1 := get_cpucfg(1)
|
|
cfg2 := get_cpucfg(2)
|
|
|
|
Loong64.HasCRC32 = cfgIsSet(cfg1, cpucfg1_CRC32)
|
|
Loong64.HasLAMCAS = cfgIsSet(cfg2, cpucfg2_LAMCAS)
|
|
Loong64.HasLAM_BH = cfgIsSet(cfg2, cpucfg2_LAM_BH)
|
|
}
|
|
|
|
func get_cpucfg(reg uint32) uint32
|
|
|
|
func cfgIsSet(cfg uint32, val uint32) bool {
|
|
return cfg&val != 0
|
|
}
|