Handle switching switching mmu contexts and mapping the new primary tsb.
Rework some register usage and code placement. Comment.
This commit is contained in:
Jake Burkholder
parent
04a8a9ba95
commit
a5f2d2a0eb
@ -27,6 +27,7 @@
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*/
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#include <machine/asmacros.h>
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#include <machine/asi.h>
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#include "assym.s"
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@ -70,32 +71,109 @@
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.endm
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ENTRY(cpu_switch)
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/*
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* Choose a new process. If its the same as the current one, do
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* nothing.
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*/
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save %sp, -CCFSZ, %sp
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call chooseproc
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ldx [PCPU(CURPROC)], %l0
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cmp %l0, %o0
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be,pn %xcc, 3f
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ldx [%l0 + P_FRAME], %l2
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ldx [%l2 + TF_TSTATE], %l2
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andcc %l2, TSTATE_PEF, %l2
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EMPTY
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/*
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* If the process was using floating point, save its context.
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*/
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ldx [%l0 + P_FRAME], %l1
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ldx [%l1 + TF_TSTATE], %l1
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andcc %l1, TSTATE_PEF, %l1
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be,pt %xcc, 1f
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ldx [PCPU(CURPCB)], %l1
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savefp %l1 + PCB_FPSTATE, %l3
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ldx [PCPU(CURPCB)], %l2
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savefp %l2 + PCB_FPSTATE, %l3
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/*
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* Flush the windows out to the stack and save the current frame
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* pointer and program counter.
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*/
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1: flushw
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wrpr %g0, 0, %cleanwin
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stx %fp, [%l1 + PCB_FP]
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stx %i7, [%l1 + PCB_PC]
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stx %fp, [%l2 + PCB_FP]
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stx %i7, [%l2 + PCB_PC]
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/*
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* Load the new process's frame pointer and program counter, and set
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* the current process and pcb.
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*/
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ldx [%o0 + P_ADDR], %o1
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ldx [%o1 + U_PCB + PCB_FP], %fp
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ldx [%o1 + U_PCB + PCB_PC], %i7
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ldx [%o0 + P_FRAME], %l2
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ldx [%l2 + TF_TSTATE], %l2
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andcc %l2, TSTATE_PEF, %l2
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sub %fp, CCFSZ, %sp
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stx %o0, [PCPU(CURPROC)]
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stx %o1, [PCPU(CURPCB)]
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/*
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* Point to the new process's vmspace and load its vm context number.
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* If its nucleus context we are done.
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*/
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ldx [%o0 + P_VMSPACE], %o2
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lduw [%o2 + VM_PMAP + PM_CONTEXT], %o3
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brz,pn %o3, 3f
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EMPTY
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/*
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* If the new process was using floating point, restore its context.
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*/
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ldx [%o0 + P_FRAME], %o4
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ldx [%o4 + TF_TSTATE], %o4
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andcc %o4, TSTATE_PEF, %o4
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be,pt %xcc, 2f
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stx %o0, [PCPU(CURPROC)]
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restrfp %o1 + U_PCB + PCB_FPSTATE, %l4
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2: stx %o1, [PCPU(CURPCB)]
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sub %fp, CCFSZ, %sp
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nop
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restrfp %o1 + U_PCB + PCB_FPSTATE, %o4
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/*
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* Point to the current process's vmspace and load the hardware
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* context number. If its the same as the new process, we are
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* done.
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*/
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ldx [%l0 + P_VMSPACE], %l1
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lduw [%l1 + VM_PMAP + PM_CONTEXT], %l3
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cmp %l3, %o3
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be,pn %xcc, 3f
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EMPTY
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/*
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* Install the new primary context.
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*/
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2: mov AA_DMMU_PCXR, %o1
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stxa %o3, [%o1] ASI_DMMU
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flush %o0
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/*
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* Map the primary user tsb.
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*/
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setx TSB_USER_MIN_ADDRESS, %o1, %o0
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mov AA_DMMU_TAR, %o1
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stxa %o0, [%o1] ASI_DMMU
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mov TLB_DAR_TSB_USER_PRIMARY, %o1
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ldx [%o2 + VM_PMAP + PM_STTE + TTE_DATA], %o3
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stxa %o3, [%o1] ASI_DTLB_DATA_ACCESS_REG
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membar #Sync
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/*
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* If the primary tsb page hasn't been initialized, initialize it
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* and update the bit in the tte.
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*/
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andcc %o3, TD_INIT, %g0
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bnz %xcc, 3f
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or %o3, TD_INIT, %o3
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stx %o3, [%o2 + VM_PMAP + PM_STTE + TTE_DATA]
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call tsb_page_init
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clr %o1
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/*
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* Done. Return and load the new process's window from the stack.
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*/
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3: ret
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restore
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END(cpu_switch)
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@ -27,6 +27,7 @@
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*/
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#include <machine/asmacros.h>
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#include <machine/asi.h>
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#include "assym.s"
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@ -70,32 +71,109 @@
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.endm
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ENTRY(cpu_switch)
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/*
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* Choose a new process. If its the same as the current one, do
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* nothing.
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*/
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save %sp, -CCFSZ, %sp
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call chooseproc
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ldx [PCPU(CURPROC)], %l0
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cmp %l0, %o0
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be,pn %xcc, 3f
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ldx [%l0 + P_FRAME], %l2
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ldx [%l2 + TF_TSTATE], %l2
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andcc %l2, TSTATE_PEF, %l2
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EMPTY
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/*
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* If the process was using floating point, save its context.
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*/
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ldx [%l0 + P_FRAME], %l1
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ldx [%l1 + TF_TSTATE], %l1
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andcc %l1, TSTATE_PEF, %l1
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be,pt %xcc, 1f
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ldx [PCPU(CURPCB)], %l1
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savefp %l1 + PCB_FPSTATE, %l3
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ldx [PCPU(CURPCB)], %l2
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savefp %l2 + PCB_FPSTATE, %l3
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/*
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* Flush the windows out to the stack and save the current frame
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* pointer and program counter.
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*/
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1: flushw
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wrpr %g0, 0, %cleanwin
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stx %fp, [%l1 + PCB_FP]
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stx %i7, [%l1 + PCB_PC]
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stx %fp, [%l2 + PCB_FP]
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stx %i7, [%l2 + PCB_PC]
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/*
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* Load the new process's frame pointer and program counter, and set
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* the current process and pcb.
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*/
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ldx [%o0 + P_ADDR], %o1
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ldx [%o1 + U_PCB + PCB_FP], %fp
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ldx [%o1 + U_PCB + PCB_PC], %i7
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ldx [%o0 + P_FRAME], %l2
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ldx [%l2 + TF_TSTATE], %l2
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andcc %l2, TSTATE_PEF, %l2
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sub %fp, CCFSZ, %sp
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stx %o0, [PCPU(CURPROC)]
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stx %o1, [PCPU(CURPCB)]
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/*
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* Point to the new process's vmspace and load its vm context number.
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* If its nucleus context we are done.
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*/
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ldx [%o0 + P_VMSPACE], %o2
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lduw [%o2 + VM_PMAP + PM_CONTEXT], %o3
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brz,pn %o3, 3f
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EMPTY
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/*
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* If the new process was using floating point, restore its context.
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*/
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ldx [%o0 + P_FRAME], %o4
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ldx [%o4 + TF_TSTATE], %o4
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andcc %o4, TSTATE_PEF, %o4
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be,pt %xcc, 2f
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stx %o0, [PCPU(CURPROC)]
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restrfp %o1 + U_PCB + PCB_FPSTATE, %l4
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2: stx %o1, [PCPU(CURPCB)]
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sub %fp, CCFSZ, %sp
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nop
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restrfp %o1 + U_PCB + PCB_FPSTATE, %o4
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/*
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* Point to the current process's vmspace and load the hardware
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* context number. If its the same as the new process, we are
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* done.
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*/
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ldx [%l0 + P_VMSPACE], %l1
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lduw [%l1 + VM_PMAP + PM_CONTEXT], %l3
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cmp %l3, %o3
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be,pn %xcc, 3f
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EMPTY
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/*
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* Install the new primary context.
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*/
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2: mov AA_DMMU_PCXR, %o1
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stxa %o3, [%o1] ASI_DMMU
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flush %o0
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/*
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* Map the primary user tsb.
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*/
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setx TSB_USER_MIN_ADDRESS, %o1, %o0
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mov AA_DMMU_TAR, %o1
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stxa %o0, [%o1] ASI_DMMU
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mov TLB_DAR_TSB_USER_PRIMARY, %o1
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ldx [%o2 + VM_PMAP + PM_STTE + TTE_DATA], %o3
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stxa %o3, [%o1] ASI_DTLB_DATA_ACCESS_REG
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membar #Sync
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/*
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* If the primary tsb page hasn't been initialized, initialize it
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* and update the bit in the tte.
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*/
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andcc %o3, TD_INIT, %g0
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bnz %xcc, 3f
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or %o3, TD_INIT, %o3
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stx %o3, [%o2 + VM_PMAP + PM_STTE + TTE_DATA]
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call tsb_page_init
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clr %o1
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/*
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* Done. Return and load the new process's window from the stack.
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*/
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3: ret
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restore
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END(cpu_switch)
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