1. Convert the tstate saved in the pcb to a pstate and test for PSTATE_PEF
to determine if a process is using floating point. in order to avoid sign extending a 13 bit immediate. 2. We don't need to context switch cwp anymore, it is better to just fiddle the save tstate on return from traps. See exception.s 1.10 and 1.12. 3. Completely remove pcb_cwp. 4. Implement vmapbuf, vunmapbuf and vm_fault_quick. Completely remove TODOs from vm_machdep.c (yay!). Submitted by: tmm (1, 3, 4) Obtained from: existing archs (4)
This commit is contained in:
jake
parent
b1b4ae1667
commit
195f88af01
@ -32,19 +32,11 @@
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#include <machine/fp.h>
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#include <machine/frame.h>
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/*
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* XXX: MAXWIN should probably be done dynamically, pcb_wscratch is therefore
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* at the end of the pcb.
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*/
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#define MAXWIN 8
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/* Used in pcb_fcwp to mark the wscratch stack as empty. */
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#define PCB_CWP_EMPTY 0xff
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#define MAXWIN 8
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/* NOTE: pcb_fpstate must be aligned on a 64 byte boundary. */
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struct pcb {
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struct fpstate pcb_fpstate;
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u_long pcb_cwp;
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u_long pcb_fp;
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u_long pcb_pc;
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u_long pcb_y;
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@ -113,7 +113,8 @@ ENTRY(cpu_switch)
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rd %fprs, %l3
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stx %l3, [%l2 + PCB_FPSTATE + FP_FPRS]
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ldx [%l1 + TF_TSTATE], %l1
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andcc %l1, TSTATE_PEF, %l1
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srlx %l1, TSTATE_PSTATE_SHIFT, %l1
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andcc %l1, PSTATE_PEF, %l1
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be,pt %xcc, 1f
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nop
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savefp %l2 + PCB_FPSTATE, %l4, %l3
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@ -124,8 +125,6 @@ ENTRY(cpu_switch)
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*/
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1: flushw
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wrpr %g0, 0, %cleanwin
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rdpr %cwp, %l3
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stx %l3, [%l2 + PCB_CWP]
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stx %fp, [%l2 + PCB_FP]
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stx %i7, [%l2 + PCB_PC]
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@ -135,7 +134,7 @@ ENTRY(cpu_switch)
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*/
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.Lsw1: ldx [%o0 + TD_PCB], %o1
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#if KTR_COMPILE & KTR_PROC
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CATR(KTR_PROC, "cpu_switch: to=%p pc=%#lx fp=%#lx sp=%#lx cwp=%#lx"
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CATR(KTR_PROC, "cpu_switch: to=%p pc=%#lx fp=%#lx sp=%#lx"
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, %g1, %g2, %g3, 7, 8, 9)
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stx %o0, [%g1 + KTR_PARM1]
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ldx [%o1 + PCB_PC], %g2
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@ -144,17 +143,7 @@ ENTRY(cpu_switch)
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stx %g2, [%g1 + KTR_PARM3]
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sub %g2, CCFSZ, %g2
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stx %g2, [%g1 + KTR_PARM4]
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ldx [%o1 + PCB_CWP], %g2
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stx %g2, [%g1 + KTR_PARM5]
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9:
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#endif
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#if 1
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mov %o0, %g4
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mov %l0, %g5
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ldx [%o1 + PCB_CWP], %o2
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wrpr %o2, %cwp
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mov %g4, %o0
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mov %g5, %l0
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#endif
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ldx [%o0 + TD_PCB], %o1
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ldx [%o1 + PCB_FP], %fp
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@ -187,7 +176,8 @@ ENTRY(cpu_switch)
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*/
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ldx [%o0 + TD_FRAME], %o4
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ldx [%o4 + TF_TSTATE], %o4
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andcc %o4, TSTATE_PEF, %o4
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srlx %o4, TSTATE_PSTATE_SHIFT, %o4
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andcc %o4, PSTATE_PEF, %o4
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be,pt %xcc, 2f
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nop
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restrfp %o1 + PCB_FPSTATE, %o4
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@ -274,7 +264,8 @@ ENTRY(savectx)
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ldx [PCPU(CURTHREAD)], %l0
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ldx [%l0 + TD_FRAME], %l0
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ldx [%l0 + TF_TSTATE], %l0
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andcc %l0, TSTATE_PEF, %l0
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srlx %l0, TSTATE_PSTATE_SHIFT, %l0
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andcc %l0, PSTATE_PEF, %l0
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be,pt %xcc, 1f
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stx %fp, [%i0 + PCB_FP]
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add %i0, PCB_FPSTATE, %o0
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@ -113,7 +113,8 @@ ENTRY(cpu_switch)
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rd %fprs, %l3
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stx %l3, [%l2 + PCB_FPSTATE + FP_FPRS]
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ldx [%l1 + TF_TSTATE], %l1
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andcc %l1, TSTATE_PEF, %l1
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srlx %l1, TSTATE_PSTATE_SHIFT, %l1
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andcc %l1, PSTATE_PEF, %l1
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be,pt %xcc, 1f
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nop
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savefp %l2 + PCB_FPSTATE, %l4, %l3
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@ -124,8 +125,6 @@ ENTRY(cpu_switch)
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*/
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1: flushw
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wrpr %g0, 0, %cleanwin
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rdpr %cwp, %l3
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stx %l3, [%l2 + PCB_CWP]
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stx %fp, [%l2 + PCB_FP]
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stx %i7, [%l2 + PCB_PC]
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@ -135,7 +134,7 @@ ENTRY(cpu_switch)
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*/
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.Lsw1: ldx [%o0 + TD_PCB], %o1
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#if KTR_COMPILE & KTR_PROC
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CATR(KTR_PROC, "cpu_switch: to=%p pc=%#lx fp=%#lx sp=%#lx cwp=%#lx"
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CATR(KTR_PROC, "cpu_switch: to=%p pc=%#lx fp=%#lx sp=%#lx"
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, %g1, %g2, %g3, 7, 8, 9)
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stx %o0, [%g1 + KTR_PARM1]
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ldx [%o1 + PCB_PC], %g2
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@ -144,17 +143,7 @@ ENTRY(cpu_switch)
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stx %g2, [%g1 + KTR_PARM3]
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sub %g2, CCFSZ, %g2
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stx %g2, [%g1 + KTR_PARM4]
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ldx [%o1 + PCB_CWP], %g2
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stx %g2, [%g1 + KTR_PARM5]
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9:
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#endif
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#if 1
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mov %o0, %g4
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mov %l0, %g5
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ldx [%o1 + PCB_CWP], %o2
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wrpr %o2, %cwp
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mov %g4, %o0
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mov %g5, %l0
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#endif
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ldx [%o0 + TD_PCB], %o1
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ldx [%o1 + PCB_FP], %fp
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@ -187,7 +176,8 @@ ENTRY(cpu_switch)
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*/
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ldx [%o0 + TD_FRAME], %o4
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ldx [%o4 + TF_TSTATE], %o4
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andcc %o4, TSTATE_PEF, %o4
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srlx %o4, TSTATE_PSTATE_SHIFT, %o4
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andcc %o4, PSTATE_PEF, %o4
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be,pt %xcc, 2f
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nop
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restrfp %o1 + PCB_FPSTATE, %o4
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@ -274,7 +264,8 @@ ENTRY(savectx)
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ldx [PCPU(CURTHREAD)], %l0
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ldx [%l0 + TD_FRAME], %l0
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ldx [%l0 + TF_TSTATE], %l0
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andcc %l0, TSTATE_PEF, %l0
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srlx %l0, TSTATE_PSTATE_SHIFT, %l0
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andcc %l0, PSTATE_PEF, %l0
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be,pt %xcc, 1f
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stx %fp, [%i0 + PCB_FP]
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add %i0, PCB_FPSTATE, %o0
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@ -57,7 +57,10 @@
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <machine/cache.h>
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#include <machine/cpu.h>
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#include <machine/frame.h>
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#include <machine/md_var.h>
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@ -108,7 +111,6 @@ cpu_fork(struct thread *td1, struct proc *p2, int flags)
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__asm __volatile("flushw");
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/* Copy the pcb (this will copy the windows saved in the pcb, too). */
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bcopy(td1->td_pcb, pcb, sizeof(*pcb));
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pcb->pcb_cwp = 2;
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/*
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* Create a new fresh stack for the new process.
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@ -127,7 +129,6 @@ cpu_fork(struct thread *td1, struct proc *p2, int flags)
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fp->f_local[0] = (u_long)fork_return;
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fp->f_local[1] = (u_long)td2;
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fp->f_local[2] = (u_long)tf;
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pcb->pcb_cwp = 0;
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pcb->pcb_fp = (u_long)fp - SPOFF;
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pcb->pcb_pc = (u_long)fork_trampoline - 8;
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@ -157,7 +158,7 @@ cpu_reset(void)
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bspec[0] = '\0';
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bspec[sizeof(bspec) - 1] = '\0';
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}
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openfirmware_exit(&args);
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}
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@ -188,30 +189,133 @@ int
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is_physical_memory(vm_offset_t addr)
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{
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TODO;
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/* There is no device memory in the midst of the normal RAM. */
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return (1);
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}
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void
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swi_vm(void *v)
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{
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TODO;
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/*
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* Nothing to do here yet - busdma bounce buffers are not yet
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* implemented.
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*/
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}
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/*
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* quick version of vm_fault
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*/
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int
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vm_fault_quick(caddr_t v, int prot)
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{
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TODO;
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return (0);
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int r;
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if (prot & VM_PROT_WRITE)
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r = subyte(v, fubyte(v));
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else
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r = fubyte(v);
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return(r);
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}
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/*
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* Map an IO request into kernel virtual address space.
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*
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* All requests are (re)mapped into kernel VA space.
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* Notice that we use b_bufsize for the size of the buffer
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* to be mapped. b_bcount might be modified by the driver.
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*/
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void
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vmapbuf(struct buf *bp)
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{
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TODO;
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caddr_t addr, kva;
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vm_offset_t pa;
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int pidx;
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struct vm_page *m;
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pmap_t pmap;
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GIANT_REQUIRED;
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if ((bp->b_flags & B_PHYS) == 0)
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panic("vmapbuf");
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pmap = &curproc->p_vmspace->vm_pmap;
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for (addr = (caddr_t)trunc_page((vm_offset_t)bp->b_data), pidx = 0;
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addr < bp->b_data + bp->b_bufsize; addr += PAGE_SIZE, pidx++) {
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/*
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* Do the vm_fault if needed; do the copy-on-write thing
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* when reading stuff off device into memory.
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*/
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vm_fault_quick((addr >= bp->b_data) ? addr : bp->b_data,
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(bp->b_iocmd == BIO_READ) ? (VM_PROT_READ | VM_PROT_WRITE) :
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VM_PROT_READ);
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pa = trunc_page(pmap_extract(pmap, (vm_offset_t)addr));
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if (pa == 0)
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panic("vmapbuf: page not present");
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m = PHYS_TO_VM_PAGE(pa);
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vm_page_hold(m);
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bp->b_pages[pidx] = m;
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}
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if (pidx > btoc(MAXPHYS))
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panic("vmapbuf: mapped more than MAXPHYS");
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pmap_qenter((vm_offset_t)bp->b_saveaddr, bp->b_pages, pidx);
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kva = bp->b_saveaddr;
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bp->b_npages = pidx;
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bp->b_saveaddr = bp->b_data;
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bp->b_data = kva + (((vm_offset_t)bp->b_data) & PAGE_MASK);
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if (CACHE_BADALIAS(trunc_page(bp->b_data),
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trunc_page(bp->b_saveaddr))) {
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/*
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* bp->data (the virtual address the buffer got mapped to in the
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* kernel) is an illegal alias to the user address.
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* If the kernel had mapped this buffer previously (during a
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* past IO operation) at this address, there might still be
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* stale but valid tagged data in the cache, so flush it.
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* XXX: the kernel address should be selected such that this
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* cannot happen.
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* XXX: pmap_kenter() maps physically uncacheable right now, so
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* this cannot happen.
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*/
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dcache_inval(pmap, (vm_offset_t)bp->b_data,
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(vm_offset_t)bp->b_data + bp->b_bufsize - 1);
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}
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}
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/*
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* Free the io map PTEs associated with this IO operation.
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* We also invalidate the TLB entries and restore the original b_addr.
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*/
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void
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vunmapbuf(struct buf *bp)
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{
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TODO;
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int pidx;
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int npages;
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GIANT_REQUIRED;
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if ((bp->b_flags & B_PHYS) == 0)
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panic("vunmapbuf");
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npages = bp->b_npages;
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pmap_qremove(trunc_page((vm_offset_t)bp->b_data),
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npages);
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for (pidx = 0; pidx < npages; pidx++)
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vm_page_unhold(bp->b_pages[pidx]);
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if (CACHE_BADALIAS(trunc_page(bp->b_data),
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trunc_page(bp->b_saveaddr))) {
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/*
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* bp->data (the virtual address the buffer got mapped to in the
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* kernel) is an illegal alias to the user address. In this
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* case, D$ of the user adress needs to be flushed to avoid the
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* user reading stale data.
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* XXX: the kernel address should be selected such that this
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* cannot happen.
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*/
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dcache_inval(&curproc->p_vmspace->vm_pmap,
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(vm_offset_t)bp->b_saveaddr, (vm_offset_t)bp->b_saveaddr +
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bp->b_bufsize - 1);
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}
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bp->b_data = bp->b_saveaddr;
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}
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