ba1c2daad4
The old code was full of complexity that would only matter if the kernel itself used the VFP hardware. Now that's reduced to either killing the userland process or panicking the kernel on an illegal VFP instruction. This removes most of the complexity from the assembler code, reducing it to just calling the save code if the outgoing thread used the VFP. The routine that stores the VFP state now takes a flag that indicates whether the hardware should be disabled after saving state. Right now it always is, but this makes the code ready to be used by get/set_mcontext() (doing so will be addressed in a future commit). Remove the arm-specific pc_vfpcthread from struct pcpu and use the MI field pc_fpcurthread instead. Reviewed by: cognet
126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
/*-
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* Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: FreeBSD: src/sys/i386/include/globaldata.h,v 1.27 2001/04/27
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PCPU_H_
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#define _MACHINE_PCPU_H_
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#ifdef _KERNEL
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#include <machine/cpuconf.h>
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#define ALT_STACK_SIZE 128
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struct vmspace;
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#endif /* _KERNEL */
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#ifdef VFP
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#define PCPU_MD_FIELDS \
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unsigned int pc_cpu; \
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unsigned int pc_vfpsid; \
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unsigned int pc_vfpmvfr0; \
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unsigned int pc_vfpmvfr1; \
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struct pmap *pc_curpmap; \
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char __pad[137]
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#else
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#define PCPU_MD_FIELDS \
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char __pad[157]
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#endif
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#ifdef _KERNEL
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struct pcb;
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struct pcpu;
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extern struct pcpu *pcpup;
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#if ARM_ARCH_6 || ARM_ARCH_7A
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/* or ARM_TP_ADDRESS mark REMOVE ME NOTE */
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#define CPU_MASK (0xf)
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#ifndef SMP
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#define get_pcpu() (pcpup)
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#else
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#define get_pcpu() __extension__ ({ \
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int id; \
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__asm __volatile("mrc p15, 0, %0, c0, c0, 5" : "=r" (id)); \
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(pcpup + (id & CPU_MASK)); \
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})
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#endif
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static inline struct thread *
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get_curthread(void)
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{
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void *ret;
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__asm __volatile("mrc p15, 0, %0, c13, c0, 4" : "=r" (ret));
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return (ret);
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}
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static inline void
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set_curthread(struct thread *td)
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{
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__asm __volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (td));
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}
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static inline void *
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get_tls(void)
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{
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void *tls;
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__asm __volatile("mrc p15, 0, %0, c13, c0, 3" : "=r" (tls));
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return (tls);
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}
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static inline void
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set_tls(void *tls)
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{
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__asm __volatile("mcr p15, 0, %0, c13, c0, 3" : : "r" (tls));
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}
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#define curthread get_curthread()
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#else
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#define get_pcpu() pcpup
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#endif
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#define PCPU_GET(member) (get_pcpu()->pc_ ## member)
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#define PCPU_ADD(member, value) (get_pcpu()->pc_ ## member += (value))
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#define PCPU_INC(member) PCPU_ADD(member, 1)
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#define PCPU_PTR(member) (&get_pcpu()->pc_ ## member)
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#define PCPU_SET(member,value) (get_pcpu()->pc_ ## member = (value))
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void pcpu0_init(void);
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#endif /* _KERNEL */
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#endif /* !_MACHINE_PCPU_H_ */
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