1 files changed, 115 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/page.h b/arch/loongarch/include/asm/page.h
new file mode 100644
index 000000000000..a3aaf34fba16
--- /dev/null
+++ b/arch/loongarch/include/asm/page.h
@@ -0,0 +1,115 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#ifndef _ASM_PAGE_H
+#define _ASM_PAGE_H
+
+#include <linux/const.h>
+#include <asm/addrspace.h>
+
+#include <vdso/page.h>
+
+#define HPAGE_SHIFT	(PAGE_SHIFT + PAGE_SHIFT - 3)
+#define HPAGE_SIZE	(_AC(1, UL) << HPAGE_SHIFT)
+#define HPAGE_MASK	(~(HPAGE_SIZE - 1))
+#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
+
+#ifndef __ASSEMBLER__
+
+#include <linux/kernel.h>
+#include <linux/pfn.h>
+
+/*
+ * It's normally defined only for FLATMEM config but it's
+ * used in our early mem init code for all memory models.
+ * So always define it.
+ */
+#define ARCH_PFN_OFFSET	PFN_UP(PHYS_OFFSET)
+
+extern void clear_page(void *page);
+extern void copy_page(void *to, void *from);
+
+#define clear_user_page(page, vaddr, pg)	clear_page(page)
+#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
+
+extern unsigned long shm_align_mask;
+
+struct page;
+struct vm_area_struct;
+void copy_user_highpage(struct page *to, struct page *from,
+	      unsigned long vaddr, struct vm_area_struct *vma);
+
+#define __HAVE_ARCH_COPY_USER_HIGHPAGE
+
+typedef struct { unsigned long pte; } pte_t;
+#define pte_val(x)	((x).pte)
+#define __pte(x)	((pte_t) { (x) })
+typedef struct page *pgtable_t;
+
+typedef struct { unsigned long pgd; } pgd_t;
+#define pgd_val(x)	((x).pgd)
+#define __pgd(x)	((pgd_t) { (x) })
+
+/*
+ * Manipulate page protection bits
+ */
+typedef struct { unsigned long pgprot; } pgprot_t;
+#define pgprot_val(x)	((x).pgprot)
+#define __pgprot(x)	((pgprot_t) { (x) })
+#define pte_pgprot(x)	__pgprot(pte_val(x) & ~_PFN_MASK)
+
+#define ptep_buddy(x)	((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
+
+/*
+ * __pa()/__va() should be used only during mem init.
+ */
+#define __pa(x)		PHYSADDR(x)
+#define __va(x)		((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
+
+#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
+#define sym_to_pfn(x)		__phys_to_pfn(__pa_symbol(x))
+
+struct page *dmw_virt_to_page(unsigned long kaddr);
+struct page *tlb_virt_to_page(unsigned long kaddr);
+
+#define pfn_to_phys(pfn)	__pfn_to_phys(pfn)
+#define phys_to_pfn(paddr)	__phys_to_pfn(paddr)
+
+#ifndef CONFIG_KFENCE
+
+#define page_to_virt(page)	__va(page_to_phys(page))
+#define virt_to_page(kaddr)	phys_to_page(__pa(kaddr))
+
+#else
+
+#define WANT_PAGE_VIRTUAL
+
+#define page_to_virt(page)								\
+({											\
+	extern char *__kfence_pool;							\
+	(__kfence_pool == NULL) ? __va(page_to_phys(page)) : page_address(page);	\
+})
+
+#define virt_to_page(kaddr)								\
+({											\
+	(likely((unsigned long)kaddr < vm_map_base)) ?					\
+	dmw_virt_to_page((unsigned long)kaddr) : tlb_virt_to_page((unsigned long)kaddr);\
+})
+
+#endif
+
+#define pfn_to_virt(pfn)	page_to_virt(pfn_to_page(pfn))
+#define virt_to_pfn(kaddr)	page_to_pfn(virt_to_page(kaddr))
+
+extern int __virt_addr_valid(volatile void *kaddr);
+#define virt_addr_valid(kaddr)	__virt_addr_valid((volatile void *)(kaddr))
+
+#define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_TSK_EXEC
+
+#include <asm-generic/memory_model.h>
+#include <asm-generic/getorder.h>
+
+#endif /* !__ASSEMBLER__ */
+
+#endif /* _ASM_PAGE_H */