From: "Aneesh Kumar K.V" <aneesh.ku...@linux.vnet.ibm.com>
The proto-VSID space is divided into two class
User: 0 to 2^(CONTEXT_BITS + USER_ESID_BITS) -1
kernel: 2^(CONTEXT_BITS + USER_ESID_BITS) to 2^(VSID_BITS) - 1
With KERNEL_START at 0xc000000000000000, the proto vsid for
the kernel ends up with 0xc00000000 (36 bits). With 64TB
patchset we need to have kernel proto-VSID in the
[2^37 to 2^38 - 1] range due to the increased USER_ESID_BITS.
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/mmu-hash64.h | 16 +++++++++++++---
arch/powerpc/kernel/exceptions-64s.S | 4 +++-
arch/powerpc/mm/slb_low.S | 16 ++++++++++++++++
3 files changed, 32 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/include/asm/mmu-hash64.h
b/arch/powerpc/include/asm/mmu-hash64.h
index daa3e4b..8e97715 100644
--- a/arch/powerpc/include/asm/mmu-hash64.h
+++ b/arch/powerpc/include/asm/mmu-hash64.h
@@ -516,9 +516,19 @@ typedef struct {
/* This is only valid for addresses >= PAGE_OFFSET */
static inline unsigned long get_kernel_vsid(unsigned long ea, int ssize)
{
- if (ssize == MMU_SEGSIZE_256M)
- return vsid_scramble(ea >> SID_SHIFT, 256M);
- return vsid_scramble(ea >> SID_SHIFT_1T, 1T);
+ unsigned long proto_vsid;
+ /*
+ * We need to make sure proto_vsid for the kernel is
+ * >= 2^(CONTEXT_BITS + USER_ESID_BITS[_1T])
+ */
+ if (ssize == MMU_SEGSIZE_256M) {
+ proto_vsid = ea >> SID_SHIFT;
+ proto_vsid |= (1UL << (CONTEXT_BITS + USER_ESID_BITS));
+ return vsid_scramble(proto_vsid, 256M);
+ }
+ proto_vsid = ea >> SID_SHIFT_1T;
+ proto_vsid |= (1UL << (CONTEXT_BITS + USER_ESID_BITS_1T));
+ return vsid_scramble(proto_vsid, 1T);
}
/* Returns the segment size indicator for a user address */
diff --git a/arch/powerpc/kernel/exceptions-64s.S
b/arch/powerpc/kernel/exceptions-64s.S
index 1c06d29..40ed208 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -958,7 +958,9 @@ _GLOBAL(do_stab_bolted)
rldimi r10,r11,7,52 /* r10 = first ste of the group */
/* Calculate VSID */
- /* This is a kernel address, so protovsid = ESID */
+ /* This is a kernel address, so protovsid = ESID | 1 << 37 */
+ li r9,0x1
+ rldimi r11,r9,(CONTEXT_BITS + USER_ESID_BITS),0
ASM_VSID_SCRAMBLE(r11, r9, 256M)
rldic r9,r11,12,16 /* r9 = vsid << 12 */
diff --git a/arch/powerpc/mm/slb_low.S b/arch/powerpc/mm/slb_low.S
index db2cb3f..405d380 100644
--- a/arch/powerpc/mm/slb_low.S
+++ b/arch/powerpc/mm/slb_low.S
@@ -57,8 +57,16 @@ _GLOBAL(slb_allocate_realmode)
_GLOBAL(slb_miss_kernel_load_linear)
li r11,0
BEGIN_FTR_SECTION
+ li r9,0x1
+ rldimi r10,r9,(CONTEXT_BITS + USER_ESID_BITS),0
b slb_finish_load
END_MMU_FTR_SECTION_IFCLR(MMU_FTR_1T_SEGMENT)
+ li r9,0x1
+ /*
+ * shift 12 bits less here, slb_finish_load_1T will do
+ * the necessary shits
+ */
+ rldimi r10,r9,(CONTEXT_BITS + USER_ESID_BITS),0
b slb_finish_load_1T
1:
@@ -86,8 +94,16 @@ _GLOBAL(slb_miss_kernel_load_vmemmap)
li r11,0
6:
BEGIN_FTR_SECTION
+ li r9,0x1
+ rldimi r10,r9,(CONTEXT_BITS + USER_ESID_BITS),0
b slb_finish_load
END_MMU_FTR_SECTION_IFCLR(MMU_FTR_1T_SEGMENT)
+ li r9,0x1
+ /*
+ * shift 12 bits less here, slb_finish_load_1T will do
+ * the necessary shits
+ */
+ rldimi r10,r9,(CONTEXT_BITS + USER_ESID_BITS),0
b slb_finish_load_1T
0: /* user address: proto-VSID = context << 15 | ESID. First check
--
1.7.10
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
