ARC: mmu: clarify the MMUv3 programming model

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c
index ec86ac0e3321..6d98e1d57a18 100644
--- a/arch/arc/mm/cache.c
+++ b/arch/arc/mm/cache.c
@@ -271,7 +271,11 @@ void __cache_line_loop_v2(phys_addr_t paddr, unsigned long vaddr,
 
 /*
  * For ARC700 MMUv3 I-cache and D-cache flushes
- * Also reused for HS38 aliasing I-cache configuration
+ *  - ARC700 programming model requires paddr and vaddr be passed in seperate
+ *    AUX registers (*_IV*L and *_PTAG respectively) irrespective of whether the
+ *    caches actually alias or not.
+ * -  For HS38, only the aliasing I-cache configuration uses the PTAG reg
+ *    (non aliasing I-cache version doesn't; while D-cache can't possibly alias)
  */
 static inline
 void __cache_line_loop_v3(phys_addr_t paddr, unsigned long vaddr,