powerpc/pseries: Add hcall to read 4 ptes at a time in real mode

This adds plpar_pte_read_4_raw() which can be used read 4 PTEs from
PHYP at a time, while in real mode.

It also creates a new hcall9 which can be used in real mode.  It's the
same as plpar_hcall9 but minus the tracing hcall statistics which may
require variables outside the RMO.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 38 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/hvCall.S b/arch/powerpc/platforms/pseries/hvCall.S
index 383a5d0e981..48d20573e4d 100644
--- a/arch/powerpc/platforms/pseries/hvCall.S
+++ b/arch/powerpc/platforms/pseries/hvCall.S
@@ -228,3 +228,41 @@ _GLOBAL(plpar_hcall9)
         mtcrf   0xff,r0
 
         blr                             /* return r3 = status */
+
+/* See plpar_hcall_raw to see why this is needed */
+_GLOBAL(plpar_hcall9_raw)
+        HMT_MEDIUM
+
+        mfcr    r0
+        stw     r0,8(r1)
+
+        std     r4,STK_PARM(r4)(r1)     /* Save ret buffer */
+
+        mr      r4,r5
+        mr      r5,r6
+        mr      r6,r7
+        mr      r7,r8
+        mr      r8,r9
+        mr      r9,r10
+        ld      r10,STK_PARM(r11)(r1)    /* put arg7 in R10 */
+        ld      r11,STK_PARM(r12)(r1)    /* put arg8 in R11 */
+        ld      r12,STK_PARM(r13)(r1)    /* put arg9 in R12 */
+
+        HVSC                            /* invoke the hypervisor */
+
+        mr      r0,r12
+        ld      r12,STK_PARM(r4)(r1)
+        std     r4,  0(r12)
+        std     r5,  8(r12)
+        std     r6, 16(r12)
+        std     r7, 24(r12)
+        std     r8, 32(r12)
+        std     r9, 40(r12)
+        std     r10,48(r12)
+        std     r11,56(r12)
+        std     r0, 64(r12)
+
+        lwz     r0,8(r1)
+        mtcrf   0xff,r0
+
+        blr                             /* return r3 = status */