1 files changed, 201 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
new file mode 100644
index 000000000..d0ee46de2
--- /dev/null
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -0,0 +1,201 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_PGTABLE_H
+#define _ASM_POWERPC_PGTABLE_H
+
+#ifndef __ASSEMBLY__
+#include <linux/mmdebug.h>
+#include <linux/mmzone.h>
+#include <asm/processor.h>		/* For TASK_SIZE */
+#include <asm/mmu.h>
+#include <asm/page.h>
+#include <asm/tlbflush.h>
+
+struct mm_struct;
+
+#endif /* !__ASSEMBLY__ */
+
+#ifdef CONFIG_PPC_BOOK3S
+#include <asm/book3s/pgtable.h>
+#else
+#include <asm/nohash/pgtable.h>
+#endif /* !CONFIG_PPC_BOOK3S */
+
+/*
+ * Protection used for kernel text. We want the debuggers to be able to
+ * set breakpoints anywhere, so don't write protect the kernel text
+ * on platforms where such control is possible.
+ */
+#if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) || \
+	defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
+#define PAGE_KERNEL_TEXT	PAGE_KERNEL_X
+#else
+#define PAGE_KERNEL_TEXT	PAGE_KERNEL_ROX
+#endif
+
+/* Make modules code happy. We don't set RO yet */
+#define PAGE_KERNEL_EXEC	PAGE_KERNEL_X
+
+/* Advertise special mapping type for AGP */
+#define PAGE_AGP		(PAGE_KERNEL_NC)
+#define HAVE_PAGE_AGP
+
+#ifndef __ASSEMBLY__
+
+void set_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
+		pte_t pte, unsigned int nr);
+#define set_ptes set_ptes
+#define update_mmu_cache(vma, addr, ptep) \
+	update_mmu_cache_range(NULL, vma, addr, ptep, 1)
+
+#ifndef MAX_PTRS_PER_PGD
+#define MAX_PTRS_PER_PGD PTRS_PER_PGD
+#endif
+
+/* Keep these as a macros to avoid include dependency mess */
+#define pte_page(x)		pfn_to_page(pte_pfn(x))
+#define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), (pgprot))
+
+static inline unsigned long pte_pfn(pte_t pte)
+{
+	return (pte_val(pte) & PTE_RPN_MASK) >> PTE_RPN_SHIFT;
+}
+
+/*
+ * Select all bits except the pfn
+ */
+static inline pgprot_t pte_pgprot(pte_t pte)
+{
+	unsigned long pte_flags;
+
+	pte_flags = pte_val(pte) & ~PTE_RPN_MASK;
+	return __pgprot(pte_flags);
+}
+
+#ifndef pmd_page_vaddr
+static inline const void *pmd_page_vaddr(pmd_t pmd)
+{
+	return __va(pmd_val(pmd) & ~PMD_MASKED_BITS);
+}
+#define pmd_page_vaddr pmd_page_vaddr
+#endif
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+extern unsigned long empty_zero_page[];
+#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
+
+extern pgd_t swapper_pg_dir[];
+
+extern void paging_init(void);
+void poking_init(void);
+
+extern unsigned long ioremap_bot;
+extern const pgprot_t protection_map[16];
+
+#ifndef CONFIG_TRANSPARENT_HUGEPAGE
+#define pmd_large(pmd)		0
+#endif
+
+/* can we use this in kvm */
+unsigned long vmalloc_to_phys(void *vmalloc_addr);
+
+void pgtable_cache_add(unsigned int shift);
+
+pte_t *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va);
+
+#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)
+void mark_initmem_nx(void);
+#else
+static inline void mark_initmem_nx(void) { }
+#endif
+
+/*
+ * When used, PTE_FRAG_NR is defined in subarch pgtable.h
+ * so we are sure it is included when arriving here.
+ */
+#ifdef PTE_FRAG_NR
+static inline void *pte_frag_get(mm_context_t *ctx)
+{
+	return ctx->pte_frag;
+}
+
+static inline void pte_frag_set(mm_context_t *ctx, void *p)
+{
+	ctx->pte_frag = p;
+}
+#else
+#define PTE_FRAG_NR		1
+#define PTE_FRAG_SIZE_SHIFT	PAGE_SHIFT
+#define PTE_FRAG_SIZE		(1UL << PTE_FRAG_SIZE_SHIFT)
+
+static inline void *pte_frag_get(mm_context_t *ctx)
+{
+	return NULL;
+}
+
+static inline void pte_frag_set(mm_context_t *ctx, void *p)
+{
+}
+#endif
+
+#ifndef pmd_is_leaf
+#define pmd_is_leaf pmd_is_leaf
+static inline bool pmd_is_leaf(pmd_t pmd)
+{
+	return false;
+}
+#endif
+
+#ifndef pud_is_leaf
+#define pud_is_leaf pud_is_leaf
+static inline bool pud_is_leaf(pud_t pud)
+{
+	return false;
+}
+#endif
+
+#ifndef p4d_is_leaf
+#define p4d_is_leaf p4d_is_leaf
+static inline bool p4d_is_leaf(p4d_t p4d)
+{
+	return false;
+}
+#endif
+
+#define pmd_pgtable pmd_pgtable
+static inline pgtable_t pmd_pgtable(pmd_t pmd)
+{
+	return (pgtable_t)pmd_page_vaddr(pmd);
+}
+
+#ifdef CONFIG_PPC64
+int __meminit vmemmap_populated(unsigned long vmemmap_addr, int vmemmap_map_size);
+bool altmap_cross_boundary(struct vmem_altmap *altmap, unsigned long start,
+			   unsigned long page_size);
+/*
+ * mm/memory_hotplug.c:mhp_supports_memmap_on_memory goes into details
+ * some of the restrictions. We don't check for PMD_SIZE because our
+ * vmemmap allocation code can fallback correctly. The pageblock
+ * alignment requirement is met using altmap->reserve blocks.
+ */
+#define arch_supports_memmap_on_memory arch_supports_memmap_on_memory
+static inline bool arch_supports_memmap_on_memory(unsigned long vmemmap_size)
+{
+	if (!radix_enabled())
+		return false;
+	/*
+	 * With 4K page size and 2M PMD_SIZE, we can align
+	 * things better with memory block size value
+	 * starting from 128MB. Hence align things with PMD_SIZE.
+	 */
+	if (IS_ENABLED(CONFIG_PPC_4K_PAGES))
+		return IS_ALIGNED(vmemmap_size, PMD_SIZE);
+	return true;
+}
+
+#endif /* CONFIG_PPC64 */
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_POWERPC_PGTABLE_H */