freebsd-dev/sys/sparc64/include/pcpu.h
Marius Strobl 09c7f9e338 - USIII-based machines can consist of CPUs running at different
frequencies (and having different cache sizes) so use the STICK
  (System TICK) timer, which was introduced due to this and is
  driven by the same frequency across all CPUs, instead of the
  TICK timer, whose frequency varies with the CPU clock, to drive
  hardclock. We try to use the STICK counter with all CPUs that are
  USIII or beyond, even when not necessary due to identical CPUs,
  as we can can also avoid the workaround for the BlackBird erratum
  #1 there. Unfortunately, using the STICK counter currently causes
  a hang with USIIIi MP machines for reasons unknown, so we still
  use the TICK timer there (which is okay as they can only consist
  of identical CPUs).
- Given that we only (try to) synchronize the (S)TICK timers of APs
  with the BSP during startup, we could end up spinning forever in
  DELAY(9) if that function is migrated to another CPU while we're
  spinning due to clock drift afterwards, so pin to the CPU in order
  to avoid migration. Unfortunately, pinning doesn't work at the
  point DELAY(9) is required by the low-level console drivers, yet,
  so switch to a function pointer, which is updated accordingly, for
  implementing DELAY(9). For USIII and beyond, this would also allow
  to easily use the STICK counter instead of the TICK one here,
  there's no benefit in doing so however.
  While at it, use cpu_spinwait(9) for spinning in the delay-
  functions. This currently is a NOP though.
- Don't set the TICK timer of the BSP to 0 during at startup as
  there's no need to do so.
- Implement cpu_est_clockrate().
- Unfortunately, USIIIi-based machines don't provide a timecounter
  device besides the STICK and TICK counters (well, in theory the
  Tomatillo bridges have a performance counter that can be (ab)used
  as timecounter by configuring it to count bus cycles, though unlike
  the performance counter of Schizo bridges, the Tomatillo one is
  broken and counts Sun knows what in this mode). This means that
  we've to use a (S)TICK counter for timecounting, which has the old
  problem of not being in sync across CPUs, so provide an additional
  timecounter function which binds itself to the BSP but has an
  adequate low priority.
2008-09-03 17:39:19 +00:00

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C

/*-
* Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: FreeBSD: src/sys/i386/include/globaldata.h,v 1.27 2001/04/27
* $FreeBSD$
*/
#ifndef _MACHINE_PCPU_H_
#define _MACHINE_PCPU_H_
#include <machine/asmacros.h>
#include <machine/cache.h>
#include <machine/frame.h>
#include <machine/intr_machdep.h>
#define ALT_STACK_SIZE 128
struct pmap;
/*
* Inside the kernel, the globally reserved register g7 is used to
* point at the globaldata structure.
*/
#define PCPU_MD_FIELDS \
struct cacheinfo pc_cache; \
struct intr_request pc_irpool[IR_FREE]; \
struct intr_request *pc_irhead; \
struct intr_request **pc_irtail; \
struct intr_request *pc_irfree; \
struct pmap *pc_pmap; \
vm_offset_t pc_addr; \
u_long pc_tickref; \
u_long pc_tickadj; \
u_int pc_clock; \
u_int pc_mid; \
u_int pc_node; \
u_int pc_tlb_ctx; \
u_int pc_tlb_ctx_max; \
u_int pc_tlb_ctx_min
#ifdef _KERNEL
struct pcb;
struct pcpu;
register struct pcb *curpcb __asm__(__XSTRING(PCB_REG));
register struct pcpu *pcpup __asm__(__XSTRING(PCPU_REG));
#define PCPU_GET(member) (pcpup->pc_ ## member)
/*
* XXX The implementation of this operation should be made atomic
* with respect to preemption.
*/
#define PCPU_ADD(member, value) (pcpup->pc_ ## member += (value))
#define PCPU_INC(member) PCPU_ADD(member, 1)
#define PCPU_PTR(member) (&pcpup->pc_ ## member)
#define PCPU_SET(member,value) (pcpup->pc_ ## member = (value))
#endif /* _KERNEL */
#endif /* !_MACHINE_PCPU_H_ */