microblaze: Unprivileged stream instruction awareness

Add cpuinfo support for the new MicroBlaze option permitting userspace
(unprivileged) access to the streaming instructions (FSL / AXI-stream).

Emit a noisy warning at bootup if this is enabled, because bad user code
can potentially lockup the CPU.

Signed-off-by: John A. Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

2 files changed, 3 insertions, 1 deletions

diff --git a/arch/microblaze/include/asm/cpuinfo.h b/arch/microblaze/include/asm/cpuinfo.h
index d8f013347a9e..7d6831ac8a46 100644
--- a/arch/microblaze/include/asm/cpuinfo.h
+++ b/arch/microblaze/include/asm/cpuinfo.h
@@ -38,6 +38,7 @@ struct cpuinfo {
         u32 use_exc;
         u32 ver_code;
         u32 mmu;
+        u32 mmu_privins;
         u32 endian;
 
         /* CPU caches */
diff --git a/arch/microblaze/include/asm/pvr.h b/arch/microblaze/include/asm/pvr.h
index 56a80e45c4e2..4bbdb4c03b57 100644
--- a/arch/microblaze/include/asm/pvr.h
+++ b/arch/microblaze/include/asm/pvr.h
@@ -117,10 +117,10 @@ struct pvr_s {
 #define PVR11_MMU_DTLB_SIZE             0x07000000
 #define PVR11_MMU_TLB_ACCESS            0x00C00000
 #define PVR11_MMU_ZONES                 0x003C0000
+#define PVR11_MMU_PRIVINS               0x00010000
 /* MSR Reset value PVR mask */
 #define PVR11_MSR_RESET_VALUE_MASK      0x000007FF
 
-
 /* PVR access macros */
 #define PVR_IS_FULL(_pvr)       (_pvr.pvr[0] & PVR0_PVR_FULL_MASK)
 #define PVR_USE_BARREL(_pvr)    (_pvr.pvr[0] & PVR0_USE_BARREL_MASK)
@@ -216,6 +216,7 @@ struct pvr_s {
 #define PVR_MMU_DTLB_SIZE(_pvr)         (_pvr.pvr[11] & PVR11_MMU_DTLB_SIZE)
 #define PVR_MMU_TLB_ACCESS(_pvr)        (_pvr.pvr[11] & PVR11_MMU_TLB_ACCESS)
 #define PVR_MMU_ZONES(_pvr)             (_pvr.pvr[11] & PVR11_MMU_ZONES)
+#define PVR_MMU_PRIVINS(pvr)            (pvr.pvr[11] & PVR11_MMU_PRIVINS)
 
 /* endian */
 #define PVR_ENDIAN(_pvr)        (_pvr.pvr[0] & PVR0_ENDI)