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-rw-r--r--arch/riscv/include/asm/page.h191
1 files changed, 191 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
new file mode 100644
index 000000000..86048c60f
--- /dev/null
+++ b/arch/riscv/include/asm/page.h
@@ -0,0 +1,191 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ * Copyright (C) 2017 XiaojingZhu <zhuxiaoj@ict.ac.cn>
+ */
+
+#ifndef _ASM_RISCV_PAGE_H
+#define _ASM_RISCV_PAGE_H
+
+#include <linux/pfn.h>
+#include <linux/const.h>
+
+#define PAGE_SHIFT (12)
+#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
+#define PAGE_MASK (~(PAGE_SIZE - 1))
+
+#ifdef CONFIG_64BIT
+#define HUGE_MAX_HSTATE 2
+#else
+#define HUGE_MAX_HSTATE 1
+#endif
+#define HPAGE_SHIFT PMD_SHIFT
+#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
+#define HPAGE_MASK (~(HPAGE_SIZE - 1))
+#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
+
+/*
+ * PAGE_OFFSET -- the first address of the first page of memory.
+ * When not using MMU this corresponds to the first free page in
+ * physical memory (aligned on a page boundary).
+ */
+#ifdef CONFIG_64BIT
+#ifdef CONFIG_MMU
+#define PAGE_OFFSET kernel_map.page_offset
+#else
+#define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
+#endif
+/*
+ * By default, CONFIG_PAGE_OFFSET value corresponds to SV57 address space so
+ * define the PAGE_OFFSET value for SV48 and SV39.
+ */
+#define PAGE_OFFSET_L4 _AC(0xffffaf8000000000, UL)
+#define PAGE_OFFSET_L3 _AC(0xffffffd800000000, UL)
+#else
+#define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
+#endif /* CONFIG_64BIT */
+
+#ifndef __ASSEMBLY__
+
+#define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
+#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
+
+#define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
+#define copy_user_page(vto, vfrom, vaddr, topg) \
+ memcpy((vto), (vfrom), PAGE_SIZE)
+
+/*
+ * Use struct definitions to apply C type checking
+ */
+
+/* Page Global Directory entry */
+typedef struct {
+ unsigned long pgd;
+} pgd_t;
+
+/* Page Table entry */
+typedef struct {
+ unsigned long pte;
+} pte_t;
+
+typedef struct {
+ unsigned long pgprot;
+} pgprot_t;
+
+typedef struct page *pgtable_t;
+
+#define pte_val(x) ((x).pte)
+#define pgd_val(x) ((x).pgd)
+#define pgprot_val(x) ((x).pgprot)
+
+#define __pte(x) ((pte_t) { (x) })
+#define __pgd(x) ((pgd_t) { (x) })
+#define __pgprot(x) ((pgprot_t) { (x) })
+
+#ifdef CONFIG_64BIT
+#define PTE_FMT "%016lx"
+#else
+#define PTE_FMT "%08lx"
+#endif
+
+#ifdef CONFIG_MMU
+extern unsigned long riscv_pfn_base;
+#define ARCH_PFN_OFFSET (riscv_pfn_base)
+#else
+#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
+#endif /* CONFIG_MMU */
+
+struct kernel_mapping {
+ unsigned long page_offset;
+ unsigned long virt_addr;
+ uintptr_t phys_addr;
+ uintptr_t size;
+ /* Offset between linear mapping virtual address and kernel load address */
+ unsigned long va_pa_offset;
+ /* Offset between kernel mapping virtual address and kernel load address */
+ unsigned long va_kernel_pa_offset;
+ unsigned long va_kernel_xip_pa_offset;
+#ifdef CONFIG_XIP_KERNEL
+ uintptr_t xiprom;
+ uintptr_t xiprom_sz;
+#endif
+};
+
+extern struct kernel_mapping kernel_map;
+extern phys_addr_t phys_ram_base;
+
+#define is_kernel_mapping(x) \
+ ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size))
+
+#define is_linear_mapping(x) \
+ ((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < PAGE_OFFSET + KERN_VIRT_SIZE))
+
+#define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
+#define kernel_mapping_pa_to_va(y) ({ \
+ unsigned long _y = y; \
+ (IS_ENABLED(CONFIG_XIP_KERNEL) && _y < phys_ram_base) ? \
+ (void *)((unsigned long)(_y) + kernel_map.va_kernel_xip_pa_offset) : \
+ (void *)((unsigned long)(_y) + kernel_map.va_kernel_pa_offset + XIP_OFFSET); \
+ })
+#define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x)
+
+#define linear_mapping_va_to_pa(x) ((unsigned long)(x) - kernel_map.va_pa_offset)
+#define kernel_mapping_va_to_pa(y) ({ \
+ unsigned long _y = y; \
+ (IS_ENABLED(CONFIG_XIP_KERNEL) && _y < kernel_map.virt_addr + XIP_OFFSET) ? \
+ ((unsigned long)(_y) - kernel_map.va_kernel_xip_pa_offset) : \
+ ((unsigned long)(_y) - kernel_map.va_kernel_pa_offset - XIP_OFFSET); \
+ })
+
+#define __va_to_pa_nodebug(x) ({ \
+ unsigned long _x = x; \
+ is_linear_mapping(_x) ? \
+ linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x); \
+ })
+
+#ifdef CONFIG_DEBUG_VIRTUAL
+extern phys_addr_t __virt_to_phys(unsigned long x);
+extern phys_addr_t __phys_addr_symbol(unsigned long x);
+#else
+#define __virt_to_phys(x) __va_to_pa_nodebug(x)
+#define __phys_addr_symbol(x) __va_to_pa_nodebug(x)
+#endif /* CONFIG_DEBUG_VIRTUAL */
+
+#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
+#define __pa(x) __virt_to_phys((unsigned long)(x))
+#define __va(x) ((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
+
+#define phys_to_pfn(phys) (PFN_DOWN(phys))
+#define pfn_to_phys(pfn) (PFN_PHYS(pfn))
+
+#define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr)))
+#define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn)))
+
+#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
+#define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
+
+#define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
+#define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
+
+#define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
+
+#ifdef CONFIG_FLATMEM
+#define pfn_valid(pfn) \
+ (((pfn) >= ARCH_PFN_OFFSET) && (((pfn) - ARCH_PFN_OFFSET) < max_mapnr))
+#endif
+
+#endif /* __ASSEMBLY__ */
+
+#define virt_addr_valid(vaddr) ({ \
+ unsigned long _addr = (unsigned long)vaddr; \
+ (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
+})
+
+#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
+
+#include <asm-generic/memory_model.h>
+#include <asm-generic/getorder.h>
+
+#endif /* _ASM_RISCV_PAGE_H */