1 /* $OpenBSD: tcb.h,v 1.3 2016/10/02 20:11:32 guenther 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 26 static inline void 27 __arm_set_tcb(void *tcb) 28 { 29 __asm volatile("mcr p15, 0, %0, c13, c0, 3\n" : : "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 __arm_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 46 static inline void * 47 __arm_read_tcb(void) 48 { 49 void *tcb; 50 __asm volatile("mrc p15, 0, %0, c13, c0, 3\n" : "=r" (tcb)); 51 return tcb; 52 } 53 54 #define TCB_GET() __arm_read_tcb() 55 56 #endif /* _KERNEL */ 57 58 #endif /* _MACHINE_TCB_H_ */ 59