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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"
/*
* Save and restore FPU state. This is done at switch time.
* We could use FPRS_DL and FPRS_DU; however, it is accessible to non-privileged
* software, so it is avoided for compatabilities sake.
* savefp clobbers %fprs.
*/
.macro savefp state, tmp, fprs
or \fprs, FPRS_FEF, \tmp
wr \tmp, 0, %fprs
stx %fsr, [\state + FP_FSR]
rd %asi, \tmp
wr %g0, ASI_BLK_S, %asi
stda %f0, [\state + FP_FB0] %asi
stda %f16, [\state + FP_FB1] %asi
stda %f32, [\state + FP_FB2] %asi
stda %f48, [\state + FP_FB3] %asi
wr \tmp, 0, %asi
membar #Sync
.endm
.macro restrfp state, tmp
rd %fprs, \tmp
or \tmp, FPRS_FEF, \tmp
wr \tmp, 0, %fprs
rd %asi, \tmp
wr %g0, ASI_BLK_S, %asi
ldda [\state + FP_FB0] %asi, %f0
ldda [\state + FP_FB1] %asi, %f16
ldda [\state + FP_FB2] %asi, %f32
ldda [\state + FP_FB3] %asi, %f48
wr \tmp, 0, %asi
membar #Sync
ldx [\state + FP_FSR], %fsr
.endm
ENTRY(cpu_throw)
save %sp, -CCFSZ, %sp
call chooseproc
ldx [PCPU(CURPROC)], %l0
flushw
b,a .Lsw1
END(cpu_throw)
ENTRY(cpu_switch)
/*
* Choose a new process. If its the same as the current one, do
* nothing.
*/
save %sp, -CCFSZ, %sp
call chooseproc
ldx [PCPU(CURPROC)], %l0
#if KTR_COMPILE & KTR_CT1
CATR(KTR_CT1, "cpu_switch: from=%p (%s) to=%p (%s)"
, %g1, %g2, %g3, 7, 8, 9)
stx %l0, [%g1 + KTR_PARM1]
add %l0, P_COMM, %g2
stx %g2, [%g1 + KTR_PARM2]
stx %o0, [%g1 + KTR_PARM3]
add %o0, P_COMM, %g2
stx %g2, [%g1 + KTR_PARM4]
9:
#endif
cmp %l0, %o0
be,pn %xcc, 3f
EMPTY
/*
* Always save %fprs and %y. Both are not used within the kernel
* and are therefore not saved in the trap frame.
* If the process was using floating point, save its context.
*/
ldx [%l0 + P_FRAME], %l1
ldx [PCPU(CURPCB)], %l2
rd %y, %l3
stx %l3, [%l2 + PCB_Y]
rd %fprs, %l3
stx %l3, [%l2 + PCB_FPSTATE + FP_FPRS]
ldx [%l1 + TF_TSTATE], %l1
andcc %l1, TSTATE_PEF, %l1
be,pt %xcc, 1f
nop
savefp %l2 + PCB_FPSTATE, %l4, %l3
/*
* Flush the windows out to the stack and save the current frame
* pointer and program counter.
*/
1: flushw
wrpr %g0, 0, %cleanwin
rdpr %cwp, %l3
stx %l3, [%l2 + PCB_CWP]
stx %fp, [%l2 + PCB_FP]
stx %i7, [%l2 + PCB_PC]
/*
* Load the new process's frame pointer and program counter, and set
* the current process and pcb.
*/
.Lsw1: ldx [%o0 + P_ADDR], %o1
#if KTR_COMPILE & KTR_CT1
CATR(KTR_CT1, "cpu_switch: to=%p pc=%#lx fp=%#lx sp=%#lx cwp=%#lx"
, %g1, %g2, %g3, 7, 8, 9)
stx %o0, [%g1 + KTR_PARM1]
ldx [%o1 + U_PCB + PCB_PC], %g2
stx %g2, [%g1 + KTR_PARM2]
ldx [%o1 + U_PCB + PCB_FP], %g2
stx %g2, [%g1 + KTR_PARM3]
sub %g2, CCFSZ, %g2
stx %g2, [%g1 + KTR_PARM4]
ldx [%o1 + U_PCB + PCB_CWP], %g2
stx %g2, [%g1 + KTR_PARM5]
9:
#endif
#if 1
mov %o0, %g4
mov %l0, %g5
ldx [%o1 + U_PCB + PCB_CWP], %o2
wrpr %o2, %cwp
mov %g4, %o0
mov %g5, %l0
#endif
ldx [%o0 + P_ADDR], %o1
ldx [%o1 + U_PCB + PCB_FP], %fp
ldx [%o1 + U_PCB + PCB_PC], %i7
sub %fp, CCFSZ, %sp
stx %o0, [PCPU(CURPROC)]
stx %o1, [PCPU(CURPCB)]
/*
* Point to the new process's vmspace and load its vm context number.
* If its nucleus context we are done.
*/
ldx [%o0 + P_VMSPACE], %o2
lduw [%o2 + VM_PMAP + PM_CONTEXT], %o3
#if KTR_COMPILE & KTR_CT1
CATR(KTR_CT1, "cpu_switch: to=%p vm=%p context=%#x"
, %g1, %g2, %g3, 7, 8, 9)
stx %o0, [%g1 + KTR_PARM1]
stx %o2, [%g1 + KTR_PARM2]
stx %o3, [%g1 + KTR_PARM3]
9:
#endif
brz,pn %o3, 3f
EMPTY
/*
* If the new process was using floating point, restore its context.
* Always restore %fprs and %y.
*/
ldx [%o0 + P_FRAME], %o4
ldx [%o4 + TF_TSTATE], %o4
andcc %o4, TSTATE_PEF, %o4
be,pt %xcc, 2f
nop
restrfp %o1 + U_PCB + PCB_FPSTATE, %o4
2: ldx [%o1 + PCB_FPSTATE + FP_FPRS], %o4
wr %o4, 0, %fprs
ldx [%o1 + PCB_Y], %o4
wr %o4, 0, %y
/*
* Point to the current process's vmspace and load the hardware
* context number. If its the same as the new process, we are
* done.
*/
ldx [%l0 + P_VMSPACE], %l1
lduw [%l1 + VM_PMAP + PM_CONTEXT], %l3
#if KTR_COMPILE & KTR_CT1
CATR(KTR_CT1, "cpu_switch: from=%p vm=%p context=%#x"
, %g1, %g2, %g3, 7, 8, 9)
stx %l0, [%g1 + KTR_PARM1]
stx %l1, [%g1 + KTR_PARM2]
stx %l3, [%g1 + KTR_PARM3]
9:
#endif
cmp %l3, %o3
be,pn %xcc, 3f
EMPTY
/*
* Install the new primary context.
*/
mov AA_DMMU_PCXR, %o1
stxa %o3, [%o1] ASI_DMMU
flush %o0
/*
* Map the primary user tsb.
*/
setx TSB_USER_MIN_ADDRESS, %o1, %o0
mov AA_DMMU_TAR, %o1
stxa %o0, [%o1] ASI_DMMU
mov TLB_DAR_TSB_USER_PRIMARY, %o1
ldx [%o2 + VM_PMAP + PM_STTE + TTE_DATA], %o3
stxa %o3, [%o1] ASI_DTLB_DATA_ACCESS_REG
membar #Sync
/*
* If the primary tsb page hasn't been initialized, initialize it
* and update the bit in the tte.
*/
andcc %o3, TD_INIT, %g0
bnz %xcc, 3f
or %o3, TD_INIT, %o3
stx %o3, [%o2 + VM_PMAP + PM_STTE + TTE_DATA]
call tsb_page_init
clr %o1
/*
* Done. Return and load the new process's window from the stack.
*/
3:
#if KTR_COMPILE & KTR_CT1
CATR(KTR_CT1, "cpu_switch: return p=%p (%s)"
, %g1, %g2, %g3, 7, 8, 9)
ldx [PCPU(CURPROC)], %g2
stx %g2, [%g1 + KTR_PARM1]
add %g2, P_COMM, %g3
stx %g3, [%g1 + KTR_PARM2]
9:
#endif
ret
restore
END(cpu_switch)
ENTRY(savectx)
save %sp, -CCFSZ, %sp
flushw
rd %y, %l0
stx %l0, [%i0 + PCB_Y]
rd %fprs, %l0
stx %l0, [%i0 + PCB_FPSTATE + FP_FPRS]
ldx [PCPU(CURPROC)], %l0
ldx [%l0 + P_FRAME], %l0
ldx [%l0 + TF_TSTATE], %l0
andcc %l0, TSTATE_PEF, %l0
be,pt %xcc, 1f
stx %fp, [%i0 + PCB_FP]
add %i0, PCB_FPSTATE, %o0
call savefpctx
1: stx %i7, [%i0 + PCB_PC]
ret
restore %g0, 0, %o0
END(savectx)
/* Note: this does not save %fprs. */
ENTRY(savefpctx)
rd %fprs, %o2
savefp %o0, %o1, %o2
retl
wr %o2, 0, %fprs
END(savefpctx)
ENTRY(restorefpctx)
restrfp %o0, %o1
ldx [%o0 + FP_FPRS], %o1
retl
wr %o1, 0, %fprs
END(restorefpctx)
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