diff options
Diffstat (limited to 'arch/sparc/include/asm/mmu_context_64.h')
| -rw-r--r-- | arch/sparc/include/asm/mmu_context_64.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/mmu_context_64.h b/arch/sparc/include/asm/mmu_context_64.h index b361702ef52a..312fcee8df2b 100644 --- a/arch/sparc/include/asm/mmu_context_64.h +++ b/arch/sparc/include/asm/mmu_context_64.h @@ -9,8 +9,10 @@ #include <linux/spinlock.h> #include <linux/mm_types.h> #include <linux/smp.h> +#include <linux/sched.h> #include <asm/spitfire.h> +#include <asm/adi_64.h> #include <asm-generic/mm_hooks.h> #include <asm/percpu.h> @@ -136,6 +138,55 @@ static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, str #define deactivate_mm(tsk,mm) do { } while (0) #define activate_mm(active_mm, mm) switch_mm(active_mm, mm, NULL) + +#define __HAVE_ARCH_START_CONTEXT_SWITCH +static inline void arch_start_context_switch(struct task_struct *prev) +{ + /* Save the current state of MCDPER register for the process + * we are switching from + */ + if (adi_capable()) { + register unsigned long tmp_mcdper; + + __asm__ __volatile__( + ".word 0x83438000\n\t" /* rd %mcdper, %g1 */ + "mov %%g1, %0\n\t" + : "=r" (tmp_mcdper) + : + : "g1"); + if (tmp_mcdper) + set_tsk_thread_flag(prev, TIF_MCDPER); + else + clear_tsk_thread_flag(prev, TIF_MCDPER); + } +} + +#define finish_arch_post_lock_switch finish_arch_post_lock_switch +static inline void finish_arch_post_lock_switch(void) +{ + /* Restore the state of MCDPER register for the new process + * just switched to. + */ + if (adi_capable()) { + register unsigned long tmp_mcdper; + + tmp_mcdper = test_thread_flag(TIF_MCDPER); + __asm__ __volatile__( + "mov %0, %%g1\n\t" + ".word 0x9d800001\n\t" /* wr %g0, %g1, %mcdper" */ + ".word 0xaf902001\n\t" /* wrpr %g0, 1, %pmcdper */ + : + : "ir" (tmp_mcdper) + : "g1"); + if (current && current->mm && current->mm->context.adi) { + struct pt_regs *regs; + + regs = task_pt_regs(current); + regs->tstate |= TSTATE_MCDE; + } + } +} + #endif /* !(__ASSEMBLY__) */ #endif /* !(__SPARC64_MMU_CONTEXT_H) */ |