1/* $OpenBSD: tcb.h,v 1.2 2017/01/10 13:13:12 patrick Exp $ */ 2 3/* 4 * Copyright (c) 2011 Philip Guenther <guenther@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19#ifndef _MACHINE_TCB_H_ 20#define _MACHINE_TCB_H_ 21 22#ifdef _KERNEL 23 24#include <machine/pcb.h> 25 26static inline void 27__aarch64_set_tcb(void *tcb) 28{ 29 __asm volatile("msr tpidr_el0, %x0" : : "r" (tcb)); 30} 31 32#define TCB_GET(p) \ 33 ((struct pcb *)(p)->p_addr)->pcb_tcb 34 35#define TCB_SET(p, addr) \ 36 do { \ 37 ((struct pcb *)(p)->p_addr)->pcb_tcb = (addr); \ 38 __aarch64_set_tcb(addr); \ 39 } while (0) 40 41#else /* _KERNEL */ 42 43/* ELF TLS ABI calls for small TCB, with static TLS data after it */ 44#define TLS_VARIANT 1 45 46static inline void * 47__aarch64_read_tcb(void) 48{ 49 void *tcb; 50 __asm volatile("mrs %x0, tpidr_el0": "=r" (tcb)); 51 return tcb; 52} 53 54#define TCB_GET() __aarch64_read_tcb() 55 56#endif /* _KERNEL */ 57 58#endif /* _MACHINE_TCB_H_ */ 59