arch/riscv/include/asm/page.h

root/arch/riscv/include/asm/page.h
/* 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>

#include <vdso/page.h>

#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_MMU
#ifdef CONFIG_64BIT
#define PAGE_OFFSET_L5          _AC(0xff60000000000000, UL)
#define PAGE_OFFSET_L4          _AC(0xffffaf8000000000, UL)
#define PAGE_OFFSET_L3          _AC(0xffffffd600000000, UL)
#ifdef CONFIG_XIP_KERNEL
#define PAGE_OFFSET             PAGE_OFFSET_L3
#else
#define PAGE_OFFSET             kernel_map.page_offset
#endif /* CONFIG_XIP_KERNEL */
#else
#define PAGE_OFFSET             _AC(0xc0000000, UL)
#endif /* CONFIG_64BIT */
#else
#define PAGE_OFFSET             ((unsigned long)phys_ram_base)
#endif /* CONFIG_MMU */

#ifndef __ASSEMBLER__

#ifdef CONFIG_RISCV_ISA_ZICBOZ
void clear_page(void *page);
#else
#define clear_page(pgaddr)                      memset((pgaddr), 0, PAGE_SIZE)
#endif
#define copy_page(to, from)                     memcpy((to), (from), PAGE_SIZE)

#define copy_user_page(vto, vfrom, vaddr, topg) copy_page(vto, vfrom)

/*
 * 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

#if defined(CONFIG_64BIT) && defined(CONFIG_MMU)
/*
 * We override this value as its generic definition uses __pa too early in
 * the boot process (before kernel_map.va_pa_offset is set).
 */
#define MIN_MEMBLOCK_ADDR      0
#endif

#define ARCH_PFN_OFFSET         (PFN_DOWN((unsigned long)phys_ram_base))

struct kernel_mapping {
        unsigned long virt_addr;
        unsigned long virt_offset;
        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 */
#ifdef CONFIG_XIP_KERNEL
        unsigned long va_kernel_xip_text_pa_offset;
        unsigned long va_kernel_xip_data_pa_offset;
        uintptr_t xiprom;
        uintptr_t xiprom_sz;
#else
        unsigned long page_offset;
        unsigned long va_kernel_pa_offset;
#endif
};

extern struct kernel_mapping kernel_map;
extern phys_addr_t phys_ram_base;
extern unsigned long vmemmap_start_pfn;

#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))

#ifndef CONFIG_DEBUG_VIRTUAL
#define linear_mapping_pa_to_va(x)      ((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
#else
void *linear_mapping_pa_to_va(unsigned long x);
#endif

#ifdef CONFIG_XIP_KERNEL
#define kernel_mapping_pa_to_va(y)      ({                                      \
        unsigned long _y = (unsigned long)(y);                                  \
        (_y < phys_ram_base) ?                                                  \
                (void *)(_y + kernel_map.va_kernel_xip_text_pa_offset) :        \
                (void *)(_y + kernel_map.va_kernel_xip_data_pa_offset);         \
        })
#else
#define kernel_mapping_pa_to_va(y) ((void *)((unsigned long)(y) + kernel_map.va_kernel_pa_offset))
#endif

#define __pa_to_va_nodebug(x)           linear_mapping_pa_to_va(x)

#ifndef CONFIG_DEBUG_VIRTUAL
#define linear_mapping_va_to_pa(x)      ((unsigned long)(x) - kernel_map.va_pa_offset)
#else
phys_addr_t linear_mapping_va_to_pa(unsigned long x);
#endif

#ifdef CONFIG_XIP_KERNEL
#define kernel_mapping_va_to_pa(y) ({                                           \
        unsigned long _y = (unsigned long)(y);                                  \
        (_y < kernel_map.virt_addr + kernel_map.xiprom_sz) ?                    \
                (_y - kernel_map.va_kernel_xip_text_pa_offset) :                \
                (_y - kernel_map.va_kernel_xip_data_pa_offset);                 \
        })
#else
#define kernel_mapping_va_to_pa(y) ((unsigned long)(y) - kernel_map.va_kernel_pa_offset)
#endif

#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 sym_to_pfn(x)           __phys_to_pfn(__pa_symbol(x))

unsigned long kaslr_offset(void);

static __always_inline void *pfn_to_kaddr(unsigned long pfn)
{
        return __va(pfn << PAGE_SHIFT);
}

#endif /* __ASSEMBLER__ */

#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 */
Linux
