[kvm-unit-tests PATCH 08/18] lib: arm: Implement flush_tlb_all

[Alexandru Elisei <alexandru.elisei@arm.com>]

flush_tlb_all performs a TLBIALL, which affects only the executing PE; fix
that by executing a TLBIALLIS. Note that virtualization extensions imply
the multiprocessing extensions, so we're safe to use that instruction.

While we're at it, let's add a comment to flush_dcache_addr stating what
instruction is uses (unsurprisingly, it's a dcache clean and invalidate to
PoC).

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 lib/arm/asm/mmu.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/arm/asm/mmu.h b/lib/arm/asm/mmu.h
index 361f3cdcc3d5..7c9ee3dbc079 100644
--- a/lib/arm/asm/mmu.h
+++ b/lib/arm/asm/mmu.h
@@ -25,8 +25,10 @@ static inline void local_flush_tlb_all(void)
 
 static inline void flush_tlb_all(void)
 {
-	//TODO
-	local_flush_tlb_all();
+	/* TLBIALLIS */
+	asm volatile("mcr p15, 0, %0, c8, c3, 0" :: "r" (0));
+	dsb();
+	isb();
 }
 
 static inline void flush_tlb_page(unsigned long vaddr)
@@ -39,6 +41,7 @@ static inline void flush_tlb_page(unsigned long vaddr)
 
 static inline void flush_dcache_addr(unsigned long vaddr)
 {
+	/* DCCIMVAC */
 	asm volatile("mcr p15, 0, %0, c7, c14, 1" :: "r" (vaddr));
 }
 
-- 
2.20.1