PowerISA v3.0 CPUs expect _PAGE_PRESENT to be at 0x8000_0000_0000_0000
instead of 0x2 and _PAGE_PTE to be at 0x4000_0000_0000_0000 instead of
0x1 in radix mode. These requirements are accomodated by changing the
flags _PAGE_PRESENT & _PAGE_PTE for 64-bit POWER server processors with
kernel commits 849f86a6 & 84c95756. This patch makes the corresponding
changes here.
Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
---
ppc64.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/ppc64.c b/ppc64.c
index 6b89eaa..8733d64 100644
--- a/ppc64.c
+++ b/ppc64.c
@@ -317,6 +317,16 @@ ppc64_init(int when)
m->_page_rw = 0x8UL;
m->_page_guarded = 0x10UL;
}
+
+ /*
+ * Starting with kernel v4.6, to accommodate both
+ * radix and hash MMU modes in a single kernel,
+ * _PAGE_PTE & _PAGE_PRESENT page flags are changed.
+ */
+ if (THIS_KERNEL_VERSION >= LINUX(4,6,0)) {
+ m->_page_pte = 0x1UL << 62;
+ m->_page_present = 0x1UL << 63;
+ }
}
if (!(machdep->flags & (VM_ORIG|VM_4_LEVEL))) {
@@ -1336,7 +1346,7 @@ ppc64_translate_pte(ulong pte, void *physaddr, ulonglong pte_rpn_shift)
ulong paddr;
paddr = PTOB(pte >> pte_rpn_shift);
- page_present = (pte & _PAGE_PRESENT);
+ page_present = !!(pte & _PAGE_PRESENT);
if (physaddr) {
*((ulong *)physaddr) = paddr;
--
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