linux/arch/csky/include/asm/page.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2
   3#ifndef __ASM_CSKY_PAGE_H
   4#define __ASM_CSKY_PAGE_H
   5
   6#include <asm/setup.h>
   7#include <asm/cache.h>
   8#include <linux/const.h>
   9
  10/*
  11 * PAGE_SHIFT determines the page size: 4KB
  12 */
  13#define PAGE_SHIFT      12
  14#define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  15#define PAGE_MASK       (~(PAGE_SIZE - 1))
  16#define THREAD_SIZE     (PAGE_SIZE * 2)
  17#define THREAD_MASK     (~(THREAD_SIZE - 1))
  18#define THREAD_SHIFT    (PAGE_SHIFT + 1)
  19
  20
  21/*
  22 * For C-SKY "User-space:Kernel-space" is "2GB:2GB" fixed by hardware and there
  23 * are two segment registers (MSA0 + MSA1) to mapping 512MB + 512MB physical
  24 * address region. We use them mapping kernel 1GB direct-map address area and
  25 * for more than 1GB of memory we use highmem.
  26 */
  27#define PAGE_OFFSET     CONFIG_PAGE_OFFSET
  28#define SSEG_SIZE       0x20000000
  29#define LOWMEM_LIMIT    (SSEG_SIZE * 2)
  30
  31#define PHYS_OFFSET_OFFSET (CONFIG_DRAM_BASE & (SSEG_SIZE - 1))
  32
  33#ifndef __ASSEMBLY__
  34
  35#include <linux/pfn.h>
  36
  37#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  38#define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
  39
  40#define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && \
  41                        (void *)(kaddr) < high_memory)
  42#define pfn_valid(pfn)          ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
  43
  44extern void *memset(void *dest, int c, size_t l);
  45extern void *memcpy(void *to, const void *from, size_t l);
  46
  47#define clear_page(page)        memset((page), 0, PAGE_SIZE)
  48#define copy_page(to, from)     memcpy((to), (from), PAGE_SIZE)
  49
  50#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
  51#define phys_to_page(paddr)     (pfn_to_page(PFN_DOWN(paddr)))
  52
  53struct page;
  54
  55#include <abi/page.h>
  56
  57struct vm_area_struct;
  58
  59typedef struct { unsigned long pte_low; } pte_t;
  60#define pte_val(x)      ((x).pte_low)
  61
  62typedef struct { unsigned long pgd; } pgd_t;
  63typedef struct { unsigned long pgprot; } pgprot_t;
  64typedef struct page *pgtable_t;
  65
  66#define pgd_val(x)      ((x).pgd)
  67#define pgprot_val(x)   ((x).pgprot)
  68
  69#define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
  70
  71#define __pte(x)        ((pte_t) { (x) })
  72#define __pgd(x)        ((pgd_t) { (x) })
  73#define __pgprot(x)     ((pgprot_t) { (x) })
  74
  75extern unsigned long va_pa_offset;
  76
  77#define ARCH_PFN_OFFSET PFN_DOWN(va_pa_offset + PHYS_OFFSET_OFFSET)
  78
  79#define __pa(x)          ((unsigned long)(x) - PAGE_OFFSET + va_pa_offset)
  80#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - va_pa_offset))
  81
  82#define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
  83
  84#define MAP_NR(x)       PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \
  85                                 PHYS_OFFSET_OFFSET)
  86#define virt_to_page(x) (mem_map + MAP_NR(x))
  87
  88#define pfn_to_kaddr(x) __va(PFN_PHYS(x))
  89
  90#include <asm-generic/memory_model.h>
  91#include <asm-generic/getorder.h>
  92
  93#endif /* !__ASSEMBLY__ */
  94#endif /* __ASM_CSKY_PAGE_H */
  95
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