diff options
Diffstat (limited to 'arch/ppc/kernel/process.c')
| -rw-r--r-- | arch/ppc/kernel/process.c | 51 |
1 files changed, 44 insertions, 7 deletions
diff --git a/arch/ppc/kernel/process.c b/arch/ppc/kernel/process.c index ed98ba6f0..41382b2d7 100644 --- a/arch/ppc/kernel/process.c +++ b/arch/ppc/kernel/process.c @@ -19,6 +19,7 @@ * */ +#include <linux/config.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/kernel.h> @@ -140,15 +141,31 @@ int check_stack(struct task_struct *tsk) } #endif /* defined(CHECK_STACK) */ +#ifdef CONFIG_ALTIVEC int -dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs) +dump_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs) { - if (regs->msr & MSR_FP) - giveup_fpu(current); - memcpy(fpregs, ¤t->thread.fpr[0], sizeof(*fpregs)); + if (regs->msr & MSR_VEC) + giveup_altivec(current); + memcpy(vrregs, ¤t->thread.vr[0], sizeof(*vrregs)); return 1; } +void +enable_kernel_altivec(void) +{ +#ifdef __SMP__ + if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) + giveup_altivec(current); + else + giveup_altivec(NULL): /* just enable AltiVec for kernel - force */ +#else + giveup_altivec(last_task_used_altivec); +#endif /* __SMP __ */ + printk("MSR_VEC in enable_altivec_kernel\n"); +} +#endif /* CONFIG_ALTIVEC */ + void enable_kernel_fp(void) { @@ -162,6 +179,15 @@ enable_kernel_fp(void) #endif /* __SMP__ */ } +int +dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs) +{ + if (regs->msr & MSR_FP) + giveup_fpu(current); + memcpy(fpregs, ¤t->thread.fpr[0], sizeof(*fpregs)); + return 1; +} + void _switch_to(struct task_struct *prev, struct task_struct *new, struct task_struct **last) @@ -194,6 +220,7 @@ _switch_to(struct task_struct *prev, struct task_struct *new, */ if ( prev->thread.regs && (prev->thread.regs->msr & MSR_FP) ) giveup_fpu(prev); +#ifdef CONFIG_ALTIVEC /* * If the previous thread 1) has some altivec regs it wants saved * (has bits in vrsave set) and 2) used altivec in the last quantum @@ -206,6 +233,7 @@ _switch_to(struct task_struct *prev, struct task_struct *new, if ( (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)) && prev->thread.vrsave ) giveup_altivec(prev); +#endif /* CONFIG_ALTIVEC */ prev->last_processor = prev->processor; current_set[smp_processor_id()] = new; #endif /* __SMP__ */ @@ -337,13 +365,18 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp, p->thread.fpscr = current->thread.fpscr; childregs->msr &= ~MSR_FP; +#ifdef CONFIG_ALTIVEC + /* + * copy altiVec info - assume lazy altiVec switch + * - kumar + */ if (regs->msr & MSR_VEC) giveup_altivec(current); - if ( p->thread.vrsave ) - memcpy(&p->thread.vrf, ¤t->thread.vrf, sizeof(p->thread.vrf)); + + memcpy(&p->thread.vr, ¤t->thread.vr, sizeof(p->thread.vr)); p->thread.vscr = current->thread.vscr; - p->thread.vrsave = current->thread.vrsave; childregs->msr &= ~MSR_VEC; +#endif /* CONFIG_ALTIVEC */ #ifdef __SMP__ p->last_processor = NO_PROC_ID; @@ -463,6 +496,10 @@ asmlinkage int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, goto out; if (regs->msr & MSR_FP) giveup_fpu(current); +#ifdef CONFIG_ALTIVEC + if (regs->msr & MSR_VEC) + giveup_altivec(current); +#endif /* CONFIG_ALTIVEC */ error = do_execve(filename, (char **) a1, (char **) a2, regs); putname(filename); out: |