Author: bdragon
Date: Wed Sep 23 00:28:47 2020
New Revision: 366040
URL: https://svnweb.freebsd.org/changeset/base/366040
Log:
[PowerPC64LE] LE opal_call() implementation
OPAL runs in big endian, so we need to rfid into it to switch endian
atomically when branching to it, and we need to do the
RETURN_TO_NATIVE_ENDIAN dance when it returns to us.
Sponsored by: Tag1 Consulting, Inc.
Modified:
head/sys/powerpc/powernv/opal.c
head/sys/powerpc/powernv/opalcall.S
Modified: head/sys/powerpc/powernv/opal.c
==============================================================================
--- head/sys/powerpc/powernv/opal.c Wed Sep 23 00:21:51 2020
(r366039)
+++ head/sys/powerpc/powernv/opal.c Wed Sep 23 00:28:47 2020
(r366040)
@@ -57,7 +57,7 @@ opal_check(void)
OF_getencprop(opal, "opal-entry-address", val, sizeof(val));
opal_entrypoint = ((uint64_t)val[0] << 32) | val[1];
- opal_msr = mfmsr() & ~(PSL_EE | PSL_IR | PSL_DR | PSL_SE);
+ opal_msr = mfmsr() & ~(PSL_EE | PSL_IR | PSL_DR | PSL_SE | PSL_LE);
opal_initialized = 1;
Modified: head/sys/powerpc/powernv/opalcall.S
==============================================================================
--- head/sys/powerpc/powernv/opalcall.S Wed Sep 23 00:21:51 2020
(r366039)
+++ head/sys/powerpc/powernv/opalcall.S Wed Sep 23 00:28:47 2020
(r366040)
@@ -84,6 +84,10 @@ ASENTRY(opal_call)
xori %r3,%r3,1
#endif
+#ifdef __LITTLE_ENDIAN__
+ mtsrr1 %r3
+#endif
+
/* Shift registers over */
mr %r3,%r4
mr %r4,%r5
@@ -93,8 +97,23 @@ ASENTRY(opal_call)
mr %r8,%r9
mr %r9,%r10
+#ifdef __LITTLE_ENDIAN__
+ /* We need to rfid to switch endian. */
+ mfctr %r11
+ mtsrr0 %r11
+ LOAD_LR_NIA
+1:
+ mflr %r11
+ addi %r11, %r11, (2f-1b)
+ mtlr %r11
/* Call OPAL */
+ rfid
+2:
+ RETURN_TO_NATIVE_ENDIAN
+#else
+ /* Call OPAL */
bctrl
+#endif
/* Restore MSR */
mtmsrd %r31
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