void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
void release_thread(struct task_struct *);
-/* Lazy FPU handling on uni-processor */
-extern struct task_struct *last_task_used_math;
-extern struct task_struct *last_task_used_altivec;
-extern struct task_struct *last_task_used_vsx;
-extern struct task_struct *last_task_used_spe;
-
#ifdef CONFIG_PPC32
#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
extern void load_up_spe(struct task_struct *);
extern void switch_booke_debug_regs(struct debug_reg *new_debug);
-#ifndef CONFIG_SMP
-extern void discard_lazy_cpu_state(void);
-#else
-static inline void discard_lazy_cpu_state(void)
-{
-}
-#endif
-
#ifdef CONFIG_PPC_FPU
extern void flush_fp_to_thread(struct task_struct *);
extern void giveup_fpu(struct task_struct *);
SYNC
MTMSRD(r5) /* enable use of fpu now */
isync
-/*
- * For SMP, we don't do lazy FPU switching because it just gets too
- * horrendously complex, especially when a task switches from one CPU
- * to another. Instead we call giveup_fpu in switch_to.
- */
-#ifndef CONFIG_SMP
- LOAD_REG_ADDRBASE(r3, last_task_used_math)
- toreal(r3)
- PPC_LL r4,ADDROFF(last_task_used_math)(r3)
- PPC_LCMPI 0,r4,0
- beq 1f
- toreal(r4)
- addi r4,r4,THREAD /* want last_task_used_math->thread */
- addi r10,r4,THREAD_FPSTATE
- SAVE_32FPVSRS(0, R5, R10)
- mffs fr0
- stfd fr0,FPSTATE_FPSCR(r10)
- PPC_LL r5,PT_REGS(r4)
- toreal(r5)
- PPC_LL r4,_MSR-STACK_FRAME_OVERHEAD(r5)
- li r10,MSR_FP|MSR_FE0|MSR_FE1
- andc r4,r4,r10 /* disable FP for previous task */
- PPC_STL r4,_MSR-STACK_FRAME_OVERHEAD(r5)
-1:
-#endif /* CONFIG_SMP */
/* enable use of FP after return */
#ifdef CONFIG_PPC32
mfspr r5,SPRN_SPRG_THREAD /* current task's THREAD (phys) */
lfd fr0,FPSTATE_FPSCR(r10)
MTFSF_L(fr0)
REST_32FPVSRS(0, R4, R10)
-#ifndef CONFIG_SMP
- subi r4,r5,THREAD
- fromreal(r4)
- PPC_STL r4,ADDROFF(last_task_used_math)(r3)
-#endif /* CONFIG_SMP */
/* restore registers and return */
/* we haven't used ctr or xer or lr */
blr
andc r4,r4,r3 /* disable FP for previous task */
PPC_STL r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1:
-#ifndef CONFIG_SMP
- li r5,0
- LOAD_REG_ADDRBASE(r4,last_task_used_math)
- PPC_STL r5,ADDROFF(last_task_used_math)(r4)
-#endif /* CONFIG_SMP */
blr
/*
oris r5,r5,MSR_SPE@h
mtmsr r5 /* enable use of SPE now */
isync
-/*
- * For SMP, we don't do lazy SPE switching because it just gets too
- * horrendously complex, especially when a task switches from one CPU
- * to another. Instead we call giveup_spe in switch_to.
- */
-#ifndef CONFIG_SMP
- lis r3,last_task_used_spe@ha
- lwz r4,last_task_used_spe@l(r3)
- cmpi 0,r4,0
- beq 1f
- addi r4,r4,THREAD /* want THREAD of last_task_used_spe */
- SAVE_32EVRS(0,r10,r4,THREAD_EVR0)
- evxor evr10, evr10, evr10 /* clear out evr10 */
- evmwumiaa evr10, evr10, evr10 /* evr10 <- ACC = 0 * 0 + ACC */
- li r5,THREAD_ACC
- evstddx evr10, r4, r5 /* save off accumulator */
- lwz r5,PT_REGS(r4)
- lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
- lis r10,MSR_SPE@h
- andc r4,r4,r10 /* disable SPE for previous task */
- stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
-1:
-#endif /* !CONFIG_SMP */
/* enable use of SPE after return */
oris r9,r9,MSR_SPE@h
mfspr r5,SPRN_SPRG_THREAD /* current task's THREAD (phys) */
evlddx evr4,r10,r5
evmra evr4,evr4
REST_32EVRS(0,r10,r5,THREAD_EVR0)
-#ifndef CONFIG_SMP
- subi r4,r5,THREAD
- stw r4,last_task_used_spe@l(r3)
-#endif /* !CONFIG_SMP */
blr
/*
andc r4,r4,r3 /* disable SPE for previous task */
stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1:
-#ifndef CONFIG_SMP
- li r5,0
- lis r4,last_task_used_spe@ha
- stw r5,last_task_used_spe@l(r4)
-#endif /* !CONFIG_SMP */
blr
#endif /* CONFIG_SPE */
std r0,_LINK(r1)
std r0,_NIP(r1)
-#ifndef CONFIG_SMP
- /* Make sure FPU, VSX etc... are flushed as we may lose
- * state when going to nap mode
- */
- bl discard_lazy_cpu_state
-#endif /* CONFIG_SMP */
-
/* Hard disable interrupts */
mfmsr r9
rldicl r9,r9,48,1
extern unsigned long _get_SP(void);
-#ifndef CONFIG_SMP
-struct task_struct *last_task_used_math = NULL;
-struct task_struct *last_task_used_altivec = NULL;
-struct task_struct *last_task_used_vsx = NULL;
-struct task_struct *last_task_used_spe = NULL;
-#endif
-
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
void giveup_fpu_maybe_transactional(struct task_struct *tsk)
{
*/
preempt_disable();
if (tsk->thread.regs->msr & MSR_FP) {
-#ifdef CONFIG_SMP
/*
* This should only ever be called for current or
* for a stopped child process. Since we save away
- * the FP register state on context switch on SMP,
+ * the FP register state on context switch,
* there is something wrong if a stopped child appears
* to still have its FP state in the CPU registers.
*/
BUG_ON(tsk != current);
-#endif
giveup_fpu_maybe_transactional(tsk);
}
preempt_enable();
{
WARN_ON(preemptible());
-#ifdef CONFIG_SMP
if (current->thread.regs && (current->thread.regs->msr & MSR_FP))
giveup_fpu_maybe_transactional(current);
else
giveup_fpu(NULL); /* just enables FP for kernel */
-#else
- giveup_fpu_maybe_transactional(last_task_used_math);
-#endif /* CONFIG_SMP */
}
EXPORT_SYMBOL(enable_kernel_fp);
{
WARN_ON(preemptible());
-#ifdef CONFIG_SMP
if (current->thread.regs && (current->thread.regs->msr & MSR_VEC))
giveup_altivec_maybe_transactional(current);
else
giveup_altivec_notask();
-#else
- giveup_altivec_maybe_transactional(last_task_used_altivec);
-#endif /* CONFIG_SMP */
}
EXPORT_SYMBOL(enable_kernel_altivec);
if (tsk->thread.regs) {
preempt_disable();
if (tsk->thread.regs->msr & MSR_VEC) {
-#ifdef CONFIG_SMP
BUG_ON(tsk != current);
-#endif
giveup_altivec_maybe_transactional(tsk);
}
preempt_enable();
{
WARN_ON(preemptible());
-#ifdef CONFIG_SMP
if (current->thread.regs && (current->thread.regs->msr & MSR_VSX))
giveup_vsx(current);
else
giveup_vsx(NULL); /* just enable vsx for kernel - force */
-#else
- giveup_vsx(last_task_used_vsx);
-#endif /* CONFIG_SMP */
}
EXPORT_SYMBOL(enable_kernel_vsx);
if (tsk->thread.regs) {
preempt_disable();
if (tsk->thread.regs->msr & MSR_VSX) {
-#ifdef CONFIG_SMP
BUG_ON(tsk != current);
-#endif
giveup_vsx(tsk);
}
preempt_enable();
{
WARN_ON(preemptible());
-#ifdef CONFIG_SMP
if (current->thread.regs && (current->thread.regs->msr & MSR_SPE))
giveup_spe(current);
else
giveup_spe(NULL); /* just enable SPE for kernel - force */
-#else
- giveup_spe(last_task_used_spe);
-#endif /* __SMP __ */
}
EXPORT_SYMBOL(enable_kernel_spe);
if (tsk->thread.regs) {
preempt_disable();
if (tsk->thread.regs->msr & MSR_SPE) {
-#ifdef CONFIG_SMP
BUG_ON(tsk != current);
-#endif
tsk->thread.spefscr = mfspr(SPRN_SPEFSCR);
giveup_spe(tsk);
}
}
#endif /* CONFIG_SPE */
-#ifndef CONFIG_SMP
-/*
- * If we are doing lazy switching of CPU state (FP, altivec or SPE),
- * and the current task has some state, discard it.
- */
-void discard_lazy_cpu_state(void)
-{
- preempt_disable();
- if (last_task_used_math == current)
- last_task_used_math = NULL;
-#ifdef CONFIG_ALTIVEC
- if (last_task_used_altivec == current)
- last_task_used_altivec = NULL;
-#endif /* CONFIG_ALTIVEC */
-#ifdef CONFIG_VSX
- if (last_task_used_vsx == current)
- last_task_used_vsx = NULL;
-#endif /* CONFIG_VSX */
-#ifdef CONFIG_SPE
- if (last_task_used_spe == current)
- last_task_used_spe = NULL;
-#endif
- preempt_enable();
-}
-#endif /* CONFIG_SMP */
-
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
void do_send_trap(struct pt_regs *regs, unsigned long address,
unsigned long error_code, int signal_code, int breakpt)
__switch_to_tm(prev);
-#ifdef CONFIG_SMP
- /* avoid complexity of lazy save/restore of fpu
- * by just saving it every time we switch out if
- * this task used the fpu during the last quantum.
- *
- * If it tries to use the fpu again, it'll trap and
- * reload its fp regs. So we don't have to do a restore
- * every switch, just a save.
- * -- Cort
- */
if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP))
giveup_fpu(prev);
#ifdef CONFIG_ALTIVEC
- /*
- * If the previous thread used altivec in the last quantum
- * (thus changing altivec regs) then save them.
- * We used to check the VRSAVE register but not all apps
- * set it, so we don't rely on it now (and in fact we need
- * to save & restore VSCR even if VRSAVE == 0). -- paulus
- *
- * On SMP we always save/restore altivec regs just to avoid the
- * complexity of changing processors.
- * -- Cort
- */
if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC))
giveup_altivec(prev);
#endif /* CONFIG_ALTIVEC */
__giveup_vsx(prev);
#endif /* CONFIG_VSX */
#ifdef CONFIG_SPE
- /*
- * If the previous thread used spe in the last quantum
- * (thus changing spe regs) then save them.
- *
- * On SMP we always save/restore spe regs just to avoid the
- * complexity of changing processors.
- */
if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE)))
giveup_spe(prev);
#endif /* CONFIG_SPE */
-#else /* CONFIG_SMP */
-#ifdef CONFIG_ALTIVEC
- /* Avoid the trap. On smp this this never happens since
- * we don't set last_task_used_altivec -- Cort
- */
- if (new->thread.regs && last_task_used_altivec == new)
- new->thread.regs->msr |= MSR_VEC;
-#endif /* CONFIG_ALTIVEC */
-#ifdef CONFIG_VSX
- if (new->thread.regs && last_task_used_vsx == new)
- new->thread.regs->msr |= MSR_VSX;
-#endif /* CONFIG_VSX */
-#ifdef CONFIG_SPE
- /* Avoid the trap. On smp this this never happens since
- * we don't set last_task_used_spe
- */
- if (new->thread.regs && last_task_used_spe == new)
- new->thread.regs->msr |= MSR_SPE;
-#endif /* CONFIG_SPE */
-
-#endif /* CONFIG_SMP */
-
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
switch_booke_debug_regs(&new->thread.debug);
#else
void exit_thread(void)
{
- discard_lazy_cpu_state();
}
void flush_thread(void)
{
- discard_lazy_cpu_state();
-
#ifdef CONFIG_HAVE_HW_BREAKPOINT
flush_ptrace_hw_breakpoint(current);
#else /* CONFIG_HAVE_HW_BREAKPOINT */
regs->msr = MSR_USER32;
}
#endif
- discard_lazy_cpu_state();
#ifdef CONFIG_VSX
current->thread.used_vsr = 0;
#endif
if (sig)
regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
- /*
- * Do this before updating the thread state in
- * current->thread.fpr/vr/evr. That way, if we get preempted
- * and another task grabs the FPU/Altivec/SPE, it won't be
- * tempted to save the current CPU state into the thread_struct
- * and corrupt what we are writing there.
- */
- discard_lazy_cpu_state();
-
#ifdef CONFIG_ALTIVEC
/*
* Force the process to reload the altivec registers from
/* Restore the previous little-endian mode */
regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
- /*
- * Do this before updating the thread state in
- * current->thread.fpr/vr/evr. That way, if we get preempted
- * and another task grabs the FPU/Altivec/SPE, it won't be
- * tempted to save the current CPU state into the thread_struct
- * and corrupt what we are writing there.
- */
- discard_lazy_cpu_state();
-
#ifdef CONFIG_ALTIVEC
regs->msr &= ~MSR_VEC;
if (msr & MSR_VEC) {
if (set != NULL)
err |= __get_user(set->sig[0], &sc->oldmask);
- /*
- * Do this before updating the thread state in
- * current->thread.fpr/vr. That way, if we get preempted
- * and another task grabs the FPU/Altivec, it won't be
- * tempted to save the current CPU state into the thread_struct
- * and corrupt what we are writing there.
- */
- discard_lazy_cpu_state();
-
/*
* Force reload of FP/VEC.
* This has to be done before copying stuff into current->thread.fpr/vr
err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
- /*
- * Do this before updating the thread state in
- * current->thread.fpr/vr. That way, if we get preempted
- * and another task grabs the FPU/Altivec, it won't be
- * tempted to save the current CPU state into the thread_struct
- * and corrupt what we are writing there.
- */
- discard_lazy_cpu_state();
-
/*
* Force reload of FP/VEC.
* This has to be done before copying stuff into current->thread.fpr/vr
MTMSRD(r5) /* enable use of AltiVec now */
isync
-/*
- * For SMP, we don't do lazy VMX switching because it just gets too
- * horrendously complex, especially when a task switches from one CPU
- * to another. Instead we call giveup_altvec in switch_to.
- * VRSAVE isn't dealt with here, that is done in the normal context
- * switch code. Note that we could rely on vrsave value to eventually
- * avoid saving all of the VREGs here...
- */
-#ifndef CONFIG_SMP
- LOAD_REG_ADDRBASE(r3, last_task_used_altivec)
- toreal(r3)
- PPC_LL r4,ADDROFF(last_task_used_altivec)(r3)
- PPC_LCMPI 0,r4,0
- beq 1f
-
- /* Save VMX state to last_task_used_altivec's THREAD struct */
- toreal(r4)
- addi r4,r4,THREAD
- addi r6,r4,THREAD_VRSTATE
- SAVE_32VRS(0,r5,r6)
- mfvscr v0
- li r10,VRSTATE_VSCR
- stvx v0,r10,r6
- /* Disable VMX for last_task_used_altivec */
- PPC_LL r5,PT_REGS(r4)
- toreal(r5)
- PPC_LL r4,_MSR-STACK_FRAME_OVERHEAD(r5)
- lis r10,MSR_VEC@h
- andc r4,r4,r10
- PPC_STL r4,_MSR-STACK_FRAME_OVERHEAD(r5)
-1:
-#endif /* CONFIG_SMP */
-
/* Hack: if we get an altivec unavailable trap with VRSAVE
* set to all zeros, we assume this is a broken application
* that fails to set it properly, and thus we switch it to
lvx v0,r10,r6
mtvscr v0
REST_32VRS(0,r4,r6)
-#ifndef CONFIG_SMP
- /* Update last_task_used_altivec to 'current' */
- subi r4,r5,THREAD /* Back to 'current' */
- fromreal(r4)
- PPC_STL r4,ADDROFF(last_task_used_altivec)(r3)
-#endif /* CONFIG_SMP */
/* restore registers and return */
blr
andc r4,r4,r3 /* disable FP for previous task */
PPC_STL r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1:
-#ifndef CONFIG_SMP
- li r5,0
- LOAD_REG_ADDRBASE(r4,last_task_used_altivec)
- PPC_STL r5,ADDROFF(last_task_used_altivec)(r4)
-#endif /* CONFIG_SMP */
blr
#ifdef CONFIG_VSX
andis. r5,r12,MSR_VEC@h
beql+ load_up_altivec /* skip if already loaded */
-#ifndef CONFIG_SMP
- ld r3,last_task_used_vsx@got(r2)
- ld r4,0(r3)
- cmpdi 0,r4,0
- beq 1f
- /* Disable VSX for last_task_used_vsx */
- addi r4,r4,THREAD
- ld r5,PT_REGS(r4)
- ld r4,_MSR-STACK_FRAME_OVERHEAD(r5)
- lis r6,MSR_VSX@h
- andc r6,r4,r6
- std r6,_MSR-STACK_FRAME_OVERHEAD(r5)
-1:
-#endif /* CONFIG_SMP */
ld r4,PACACURRENT(r13)
addi r4,r4,THREAD /* Get THREAD */
li r6,1
/* enable use of VSX after return */
oris r12,r12,MSR_VSX@h
std r12,_MSR(r1)
-#ifndef CONFIG_SMP
- /* Update last_task_used_vsx to 'current' */
- ld r4,PACACURRENT(r13)
- std r4,0(r3)
-#endif /* CONFIG_SMP */
b fast_exception_return
/*
andc r4,r4,r3 /* disable VSX for previous task */
std r4,_MSR-STACK_FRAME_OVERHEAD(r5)
1:
-#ifndef CONFIG_SMP
- li r5,0
- ld r4,last_task_used_vsx@got(r2)
- std r5,0(r4)
-#endif /* CONFIG_SMP */
blr
#endif /* CONFIG_VSX */
projects / users / willy / pagecache.git / commitdiff