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/*-
* Copyright (c) 2001 Jake Burkholder.
* 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.
*
* $FreeBSD$
*/
#include <machine/asmacros.h>
#include <machine/asi.h>
#include <machine/ktr.h>
#include <machine/tstate.h>
#include "assym.s"
ENTRY(cpu_throw)
save %sp, -CCFSZ, %sp
call choosethread
ldx [PCPU(CURTHREAD)], %l0
flushw
b,a %xcc, .Lsw1
nop
END(cpu_throw)
ENTRY(cpu_switch)
/*
* Choose a new thread. If its the same as the current one, do
* nothing.
*/
save %sp, -CCFSZ, %sp
call choosethread
ldx [PCPU(CURTHREAD)], %l0
cmp %l0, %o0
be,a,pn %xcc, 4f
nop
ldx [%l0 + TD_PCB], %l1
/*
* If the current thread was using floating point, save its context.
*/
ldx [%l0 + TD_FRAME], %l2
ldub [%l2 + TF_FPRS], %l3
andcc %l3, FPRS_FEF, %g0
bz,a,pt %xcc, 1f
nop
wr %g0, FPRS_FEF, %fprs
wr %g0, ASI_BLK_S, %asi
stda %f0, [%l1 + PCB_FPSTATE + FP_FB0] %asi
stda %f16, [%l1 + PCB_FPSTATE + FP_FB1] %asi
stda %f32, [%l1 + PCB_FPSTATE + FP_FB2] %asi
stda %f48, [%l1 + PCB_FPSTATE + FP_FB3] %asi
membar #Sync
wr %g0, 0, %fprs
andn %l3, FPRS_FEF, %l3
stb %l3, [%l2 + TF_FPRS]
/*
* Flush the windows out to the stack and save the current frame
* pointer and program counter.
*/
1: flushw
wrpr %g0, 0, %cleanwin
stx %fp, [%l1 + PCB_FP]
stx %i7, [%l1 + PCB_PC]
/*
* Load the new thread's frame pointer and program counter, and set
* the current thread and pcb.
*/
.Lsw1:
#if KTR_COMPILE & KTR_PROC
CATR(KTR_PROC, "cpu_switch: td=%d (%s) pc=%#lx fp=%#lx"
, %l3, %l4, %l5, 7, 8, 9)
ldx [%o0 + TD_PROC], %l4
lduw [%l4 + P_PID], %l5
stx %l5, [%l3 + KTR_PARM1]
add %l4, P_COMM, %l5
stx %l5, [%l3 + KTR_PARM2]
ldx [%o0 + TD_PCB], %l4
ldx [%l4 + PCB_PC], %l5
stx %l5, [%l3 + KTR_PARM3]
ldx [%l4 + PCB_FP], %l5
stx %l5, [%l3 + KTR_PARM4]
9:
#endif
ldx [%o0 + TD_PCB], %o1
ldx [%o1 + PCB_FP], %fp
ldx [%o1 + PCB_PC], %i7
sub %fp, CCFSZ, %sp
stx %o0, [PCPU(CURTHREAD)]
stx %o1, [PCPU(CURPCB)]
wrpr %g0, PSTATE_NORMAL, %pstate
mov %o1, PCB_REG
wrpr %g0, PSTATE_ALT, %pstate
mov %o1, PCB_REG
wrpr %g0, PSTATE_KERNEL, %pstate
/*
* Point to the vmspaces of the new and old processes.
*/
2: ldx [%l0 + TD_PROC], %l2
ldx [%o0 + TD_PROC], %o2
ldx [%l2 + P_VMSPACE], %l2
ldx [%o2 + P_VMSPACE], %o2
/*
* If they're the same we are done.
*/
cmp %l2, %o2
be,a,pn %xcc, 4f
nop
/*
* If the old process has nucleus context we can skip demapping the
* tsb.
*/
lduw [PCPU(CPUID)], %l3
sllx %l3, INT_SHIFT, %l3
add %l2, VM_PMAP + PM_CONTEXT, %l4
lduw [%l3 + %l4], %l5
brz,a,pn %l5, 3f
nop
/*
* Demap the old process's tsb.
*/
ldx [%l2 + VM_PMAP + PM_TSB], %l3
or %l3, TLB_DEMAP_NUCLEUS | TLB_DEMAP_PAGE, %l3
stxa %g0, [%l3] ASI_DMMU_DEMAP
membar #Sync
/*
* Mark the pmap no longer active on this cpu.
*/
lduw [%l2 + VM_PMAP + PM_ACTIVE], %l3
lduw [PCPU(CPUMASK)], %l4
andn %l3, %l4, %l3
stw %l3, [%l2 + VM_PMAP + PM_ACTIVE]
/*
* If the new process has nucleus context we are done.
*/
3: lduw [PCPU(CPUID)], %o3
sllx %o3, INT_SHIFT, %o3
add %o2, VM_PMAP + PM_CONTEXT, %o4
lduw [%o3 + %o4], %o5
brz,a,pn %o5, 4f
nop
/*
* Install the new primary context.
*/
mov AA_DMMU_PCXR, %o4
stxa %o5, [%o4] ASI_DMMU
flush %o0
/*
* Mark the pmap as active on this cpu.
*/
lduw [%o2 + VM_PMAP + PM_ACTIVE], %o3
lduw [PCPU(CPUMASK)], %o4
or %o3, %o4, %o3
stw %o3, [%o2 + VM_PMAP + PM_ACTIVE]
/*
* Switch to mmu globals and install the preloaded tsb pointer.
*/
ldx [%o2 + VM_PMAP + PM_TSB], %o3
wrpr %g0, PSTATE_MMU, %pstate
mov %o3, TSB_REG
wrpr %g0, PSTATE_KERNEL, %pstate
/*
* Done. Return and load the new process's window from the stack.
*/
4: ret
restore
END(cpu_switch)
ENTRY(savectx)
save %sp, -CCFSZ, %sp
flushw
call savefpctx
mov %i0, %o0
stx %fp, [%i0 + PCB_FP]
stx %i7, [%i0 + PCB_PC]
ret
restore %g0, 0, %o0
END(savectx)
ENTRY(savefpctx)
wr %g0, FPRS_FEF, %fprs
wr %g0, ASI_BLK_S, %asi
stda %f0, [%o0 + PCB_FPSTATE + FP_FB0] %asi
stda %f16, [%o0 + PCB_FPSTATE + FP_FB1] %asi
stda %f32, [%o0 + PCB_FPSTATE + FP_FB2] %asi
stda %f48, [%o0 + PCB_FPSTATE + FP_FB3] %asi
membar #Sync
retl
wr %g0, 0, %fprs
END(savefpctx)
ENTRY(restorefpctx)
wr %g0, FPRS_FEF, %fprs
wr %g0, ASI_BLK_S, %asi
ldda [%o0 + PCB_FPSTATE + FP_FB0] %asi, %f0
ldda [%o0 + PCB_FPSTATE + FP_FB1] %asi, %f16
ldda [%o0 + PCB_FPSTATE + FP_FB2] %asi, %f32
ldda [%o0 + PCB_FPSTATE + FP_FB3] %asi, %f48
membar #Sync
retl
wr %g0, 0, %fprs
END(restorefpctx)
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