| // Copyright 2015 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. | |
| // +build mips64 mips64le | |
| // +build linux | |
| package runtime | |
| import "unsafe" | |
| // On mips64, Linux limits the user address space to 40 bits (see | |
| // TASK_SIZE64 in the Linux kernel). This has grown over time, | |
| // so here we allow 48 bit addresses. | |
| // | |
| // In addition to the 16 bits taken from the top, we can take 3 from the | |
| // bottom, because node must be pointer-aligned, giving a total of 19 bits | |
| // of count. | |
| const ( | |
| addrBits = 48 | |
| cntBits = 64 - addrBits + 3 | |
| ) | |
| func lfstackPack(node *lfnode, cnt uintptr) uint64 { | |
| return uint64(uintptr(unsafe.Pointer(node)))<<(64-addrBits) | uint64(cnt&(1<<cntBits-1)) | |
| } | |
| func lfstackUnpack(val uint64) (node *lfnode, cnt uintptr) { | |
| node = (*lfnode)(unsafe.Pointer(uintptr(val >> cntBits << 3))) | |
| cnt = uintptr(val & (1<<cntBits - 1)) | |
| return | |
| } |