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/* $OpenBSD: tcb.h,v 1.4 2017/04/20 16:07:52 visa Exp $ */
/*
* Copyright (c) 2011 Philip Guenther <guenther@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _MACHINE_TCB_H_
#define _MACHINE_TCB_H_
#ifdef _KERNEL
static inline void
__mips64_set_tcb(struct proc *p, void *tcb)
{
#ifdef CPU_MIPS64R2
extern int cpu_has_userlocal;
if (cpu_has_userlocal)
cp0_set_userlocal(tcb);
#endif
p->p_md.md_tcb = tcb;
}
#define TCB_SET(p, addr) __mips64_set_tcb(p, addr)
#define TCB_GET(p) ((p)->p_md.md_tcb)
#else /* _KERNEL */
/* ELF TLS ABI calls for small TCB, with static TLS data after it */
#define TLS_VARIANT 1
static inline void *
__mips64_get_tcb(void)
{
void *tcb;
/*
* This invokes emulation in kernel if the system does not implement
* the RDHWR instruction or the UserLocal register.
*/
__asm__ volatile (
" .set push\n"
" .set mips64r2\n"
" rdhwr %0, $29\n"
" .set pop\n" : "=r" (tcb));
return tcb;
}
#define TCB_GET() __mips64_get_tcb()
#endif /* _KERNEL */
#endif /* _MACHINE_TCB_H_ */
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