[src/trunk]: src/sys/arch/aarch64/include add helper function aarch64_address...

[ryo <ryo%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/3aade8ca6e62
branches:  trunk
changeset: 745370:3aade8ca6e62
user:      ryo <ryo%NetBSD.org@localhost>
date:      Sat Feb 29 21:32:22 2020 +0000

description:
add helper function aarch64_addresspace() and aarch64_untag_address() to check address space, and eliminate address tag

diffstat:

 sys/arch/aarch64/include/pmap.h |  72 ++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 71 insertions(+), 1 deletions(-)

diffs (93 lines):

diff -r 079721d1b6fd -r 3aade8ca6e62 sys/arch/aarch64/include/pmap.h
--- a/sys/arch/aarch64/include/pmap.h   Sat Feb 29 21:31:55 2020 +0000
+++ b/sys/arch/aarch64/include/pmap.h   Sat Feb 29 21:32:22 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.h,v 1.35 2020/02/29 21:09:11 ryo Exp $ */
+/* $NetBSD: pmap.h,v 1.36 2020/02/29 21:32:22 ryo Exp $ */
 
 /*-
  * Copyright (c) 2014 The NetBSD Foundation, Inc.
@@ -44,6 +44,7 @@
 #include <sys/queue.h>
 #include <uvm/uvm_pglist.h>
 
+#include <aarch64/armreg.h>
 #include <aarch64/pte.h>
 
 #define PMAP_NEED_PROCWR
@@ -278,6 +279,75 @@
        return pflag;
 }
 
+/*
+ * Which is the address space of this VA?
+ * return the space considering TBI. (PAC is not yet)
+ *
+ * return value: AARCH64_ADDRSPACE_{LOWER,UPPER}{_OUTOFRANGE}?
+ */
+#define AARCH64_ADDRTOP_TAG            __BIT(55)       /* ECR_EL1.TBI[01]=1 */
+#define AARCH64_ADDRTOP_MSB            __BIT(63)       /* ECR_EL1.TBI[01]=0 */
+#define AARCH64_ADDRESS_TAG_MASK       __BITS(63,56)   /* if TCR.TBI[01]=1 */
+#define AARCH64_ADDRESS_PAC_MASK       __BITS(54,48)   /* depend on VIRT_BIT */
+#define AARCH64_ADDRESS_TAGPAC_MASK    \
+                       (AARCH64_ADDRESS_TAG_MASK|AARCH64_ADDRESS_PAC_MASK)
+
+#define AARCH64_ADDRSPACE_LOWER                        0       /* -> TTBR0 */
+#define AARCH64_ADDRSPACE_UPPER                        1       /* -> TTBR1 */
+#define AARCH64_ADDRSPACE_LOWER_OUTOFRANGE     -1      /* certainly fault */
+#define AARCH64_ADDRSPACE_UPPER_OUTOFRANGE     -2      /* certainly fault */
+static inline int
+aarch64_addressspace(vaddr_t va)
+{
+       uint64_t addrtop, tbi;
+
+       addrtop = (uint64_t)va & AARCH64_ADDRTOP_TAG;
+       tbi = addrtop ? TCR_TBI1 : TCR_TBI0;
+       if (reg_tcr_el1_read() & tbi) {
+               if (addrtop == 0) {
+                       /* lower address, and TBI0 enabled */
+                       if ((va & AARCH64_ADDRESS_PAC_MASK) != 0)
+                               return AARCH64_ADDRSPACE_LOWER_OUTOFRANGE;
+                       return AARCH64_ADDRSPACE_LOWER;
+               }
+               /* upper address, and TBI1 enabled */
+               if ((va & AARCH64_ADDRESS_PAC_MASK) != AARCH64_ADDRESS_PAC_MASK)
+                       return AARCH64_ADDRSPACE_UPPER_OUTOFRANGE;
+               return AARCH64_ADDRSPACE_UPPER;
+       }
+
+       addrtop = (uint64_t)va & AARCH64_ADDRTOP_MSB;
+       if (addrtop == 0) {
+               /* lower address, and TBI0 disabled */
+               if ((va & AARCH64_ADDRESS_TAGPAC_MASK) != 0)
+                       return AARCH64_ADDRSPACE_LOWER_OUTOFRANGE;
+               return AARCH64_ADDRSPACE_LOWER;
+       }
+       /* upper address, and TBI1 disabled */
+       if ((va & AARCH64_ADDRESS_TAGPAC_MASK) != AARCH64_ADDRESS_TAGPAC_MASK)
+               return AARCH64_ADDRSPACE_UPPER_OUTOFRANGE;
+       return AARCH64_ADDRSPACE_UPPER;
+}
+
+static inline vaddr_t
+aarch64_untag_address(vaddr_t va)
+{
+       uint64_t addrtop, tbi;
+
+       addrtop = (uint64_t)va & AARCH64_ADDRTOP_TAG;
+       tbi = addrtop ? TCR_TBI1 : TCR_TBI0;
+       if (reg_tcr_el1_read() & tbi) {
+               if (addrtop == 0) {
+                       /* lower address, and TBI0 enabled */
+                       return (uint64_t)va & ~AARCH64_ADDRESS_TAG_MASK;
+               }
+               /* upper address, and TBI1 enabled */
+               return (uint64_t)va | AARCH64_ADDRESS_TAG_MASK;
+       }
+
+       /* TBI[01] is disabled, nothing to do */
+       return va;
+}
 
 #define pmap_phys_address(pa)          aarch64_ptob((pa))
 #define pmap_mmap_flags(ppn)           aarch64_mmap_flags((ppn))