[Xen-changelog] [xen master] xen: arm: Enable 40 bit addressing in VTCR for arm64

[patchbot@xxxxxxx]

commit 50257e96b77c51b3eeb06ab68e7bd48ba2a8752b
Author:     Ian Campbell <ian.campbell@xxxxxxxxxx>
AuthorDate: Thu Oct 10 15:43:41 2013 +0100
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Thu Oct 24 14:23:36 2013 +0100

    xen: arm: Enable 40 bit addressing in VTCR for arm64
    
    This requires setting the v8 specific VTCR_EL2.PS field. These bits are
    UNK/SBZP on v7.
    
    Also the TS0SZ field is described slightly differently for v8, so update the
    comment to reflect this.
    
    Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
 xen/arch/arm/mm.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index eaeb0c3..1773ffe 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -369,9 +369,16 @@ void __cpuinit setup_virt_paging(void)
     /* Setup Stage 2 address translation */
     /* SH0=00, ORGN0=IRGN0=01
      * SL0=01 (Level-1)
-     * T0SZ=(1)1000 = -8 (40 bit physical addresses)
+     * ARVv7: T0SZ=(1)1000 = -8 (32-(-8) = 40 bit physical addresses)
+     * ARMv8: T0SZ=01 1000 = 24 (64-24   = 40 bit physical addresses)
+     *        PS=010 == 40 bits
      */
-    WRITE_SYSREG32(0x80002558, VTCR_EL2); isb();
+#ifdef CONFIG_ARM_32
+    WRITE_SYSREG32(0x80002558, VTCR_EL2);
+#else
+    WRITE_SYSREG32(0x80022558, VTCR_EL2);
+#endif
+    isb();
 }
 
 static inline lpae_t pte_of_xenaddr(vaddr_t va)
--
generated by git-patchbot for /home/xen/git/xen.git#master

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog