1 files changed, 106 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/page_64.h b/arch/powerpc/include/asm/page_64.h
new file mode 100644
index 000000000..79a9b7c6a
--- /dev/null
+++ b/arch/powerpc/include/asm/page_64.h
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _ASM_POWERPC_PAGE_64_H
+#define _ASM_POWERPC_PAGE_64_H
+
+/*
+ * Copyright (C) 2001 PPC64 Team, IBM Corp
+ */
+
+#include <asm/asm-const.h>
+
+/*
+ * We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux
+ * specific, every notion of page number shared with the firmware, TCEs,
+ * iommu, etc... still uses a page size of 4K.
+ */
+#define HW_PAGE_SHIFT		12
+#define HW_PAGE_SIZE		(ASM_CONST(1) << HW_PAGE_SHIFT)
+#define HW_PAGE_MASK		(~(HW_PAGE_SIZE-1))
+
+/*
+ * PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and
+ * HW_PAGE_SHIFT, that is 4K pages.
+ */
+#define PAGE_FACTOR		(PAGE_SHIFT - HW_PAGE_SHIFT)
+
+/* Segment size; normal 256M segments */
+#define SID_SHIFT		28
+#define SID_MASK		ASM_CONST(0xfffffffff)
+#define ESID_MASK		0xfffffffff0000000UL
+#define GET_ESID(x)		(((x) >> SID_SHIFT) & SID_MASK)
+
+/* 1T segments */
+#define SID_SHIFT_1T		40
+#define SID_MASK_1T		0xffffffUL
+#define ESID_MASK_1T		0xffffff0000000000UL
+#define GET_ESID_1T(x)		(((x) >> SID_SHIFT_1T) & SID_MASK_1T)
+
+#ifndef __ASSEMBLY__
+#include <asm/cache.h>
+
+typedef unsigned long pte_basic_t;
+
+static inline void clear_page(void *addr)
+{
+	unsigned long iterations;
+	unsigned long onex, twox, fourx, eightx;
+
+	iterations = ppc64_caches.l1d.blocks_per_page / 8;
+
+	/*
+	 * Some verisions of gcc use multiply instructions to
+	 * calculate the offsets so lets give it a hand to
+	 * do better.
+	 */
+	onex = ppc64_caches.l1d.block_size;
+	twox = onex << 1;
+	fourx = onex << 2;
+	eightx = onex << 3;
+
+	asm volatile(
+	"mtctr	%1	# clear_page\n\
+	.balign	16\n\
+1:	dcbz	0,%0\n\
+	dcbz	%3,%0\n\
+	dcbz	%4,%0\n\
+	dcbz	%5,%0\n\
+	dcbz	%6,%0\n\
+	dcbz	%7,%0\n\
+	dcbz	%8,%0\n\
+	dcbz	%9,%0\n\
+	add	%0,%0,%10\n\
+	bdnz+	1b"
+	: "=&r" (addr)
+	: "r" (iterations), "0" (addr), "b" (onex), "b" (twox),
+		"b" (twox+onex), "b" (fourx), "b" (fourx+onex),
+		"b" (twox+fourx), "b" (eightx-onex), "r" (eightx)
+	: "ctr", "memory");
+}
+
+extern void copy_page(void *to, void *from);
+
+/* Log 2 of page table size */
+extern u64 ppc64_pft_size;
+
+#endif /* __ASSEMBLY__ */
+
+#define VM_DATA_DEFAULT_FLAGS \
+	(is_32bit_task() ? \
+	 VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
+
+/*
+ * This is the default if a program doesn't have a PT_GNU_STACK
+ * program header entry. The PPC64 ELF ABI has a non executable stack
+ * stack by default, so in the absence of a PT_GNU_STACK program header
+ * we turn execute permission off.
+ */
+#define VM_STACK_DEFAULT_FLAGS32	VM_DATA_FLAGS_EXEC
+#define VM_STACK_DEFAULT_FLAGS64	VM_DATA_FLAGS_NON_EXEC
+
+#define VM_STACK_DEFAULT_FLAGS \
+	(is_32bit_task() ? \
+	 VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
+
+#include <asm-generic/getorder.h>
+
+#endif /* _ASM_POWERPC_PAGE_64_H */