Architecture 2.07 defines a new MSR Split Little Endian (SLE) bit,
which changes the order used for data storage accesses.
If MSR[SLE] is 0, instruction and data storage accesses for the
thread are the same and use the value specified by MSR[LE].
If MSR[SLE] is 1, instruction and data storage accesses for the
thread are opposite. Instruction storage accesses use the value
specified by MSR[LE]. Data storage accesses use the value specified
by ~MSR[LE].
The table below illustrates the Endian modes for all combinations
of MSR[SLE] and MSR[LE].
SLE LE Data Instruction
0 0 Big Big
0 1 Little Little
1 0 Little Big
1 1 Big Little
Signed-off-by: Cédric Le Goater <clg@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
---
This is clearly a powerpc patch but the following patch is for
kvm-ppc and it depends on it. I am not sure how to handle the
patch serie. Should I send to linuxppc-dev@xxxxxxxxxxxxxxxx also ?
Thanks,
C.
arch/powerpc/include/asm/reg.h | 3 +++
arch/powerpc/kernel/process.c | 1 +
2 files changed, 4 insertions(+)
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 5c45787..1464ef9 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -29,6 +29,7 @@
#define MSR_SF_LG 63 /* Enable 64 bit mode */
#define MSR_ISF_LG 61 /* Interrupt 64b mode valid on 630 */
#define MSR_HV_LG 60 /* Hypervisor state */
+#define MSR_SLE_LG 58 /* Split Little Endian */
#define MSR_TS_T_LG 34 /* Trans Mem state: Transactional */
#define MSR_TS_S_LG 33 /* Trans Mem state: Suspended */
#define MSR_TS_LG 33 /* Trans Mem state (2 bits) */
@@ -68,11 +69,13 @@
#define MSR_SF __MASK(MSR_SF_LG) /* Enable 64 bit mode */
#define MSR_ISF __MASK(MSR_ISF_LG) /* Interrupt 64b mode valid on 630 */
#define MSR_HV __MASK(MSR_HV_LG) /* Hypervisor state */
+#define MSR_SLE __MASK(MSR_SLE_LG) /* Split Little Endian */
#else
/* so tests for these bits fail on 32-bit */
#define MSR_SF 0
#define MSR_ISF 0
#define MSR_HV 0
+#define MSR_SLE 0
#endif
#define MSR_VEC __MASK(MSR_VEC_LG) /* Enable AltiVec */
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 5c466aa..7f87981 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -799,6 +799,7 @@ static struct regbit {
#if defined(CONFIG_PPC64) && !defined(CONFIG_BOOKE)
{MSR_SF, "SF"},
{MSR_HV, "HV"},
+ {MSR_SLE, "SLE"},
#endif
{MSR_VEC, "VEC"},
{MSR_VSX, "VSX"},
--
1.7.10.4
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