ARC: mm: move MMU specific bits out of ASID allocator

And while at it, rewrite commentary on ASID allocator

Signed-off-by: Vineet Gupta <vgupta@kernel.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/arc/include/asm/mmu.h b/arch/arc/include/asm/mmu.h
index 762cfe66e16b..c8b490175eae 100644
--- a/arch/arc/include/asm/mmu.h
+++ b/arch/arc/include/asm/mmu.h
@@ -64,6 +64,19 @@ typedef struct {
 	unsigned long asid[NR_CPUS];	/* 8 bit MMU PID + Generation cycle */
 } mm_context_t;
 
+static inline void mmu_setup_asid(struct mm_struct *mm, unsigned int asid)
+{
+	write_aux_reg(ARC_REG_PID, asid | MMU_ENABLE);
+}
+
+static inline void mmu_setup_pgd(struct mm_struct *mm, void *pgd)
+{
+	/* PGD cached in MMU reg to avoid 3 mem lookups: task->mm->pgd */
+#ifdef CONFIG_ISA_ARCV2
+	write_aux_reg(ARC_REG_SCRATCH_DATA0, (unsigned int)pgd);
+#endif
+}
+
 static inline int is_pae40_enabled(void)
 {
 	return IS_ENABLED(CONFIG_ARC_HAS_PAE40);