LXR linux/arch/csky/include/asm/page.h

   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
  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 * NOTE: virtual isn't really correct, actually it should be the offset into the
  22 * memory node, but we have no highmem, so that works for now.
  23 * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
  24 * of the shifts unnecessary.
  25 */
  26
  27#ifndef __ASSEMBLY__
  28
  29#include <linux/pfn.h>
  30
  31#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  32#define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
  33
  34#define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && \
  35                        (void *)(kaddr) < high_memory)
  36#define pfn_valid(pfn)          ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
  37
  38extern void *memset(void *dest, int c, size_t l);
  39extern void *memcpy(void *to, const void *from, size_t l);
  40
  41#define clear_page(page)        memset((page), 0, PAGE_SIZE)
  42#define copy_page(to, from)     memcpy((to), (from), PAGE_SIZE)
  43
  44#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
  45#define phys_to_page(paddr)     (pfn_to_page(PFN_DOWN(paddr)))
  46
  47struct page;
  48
  49#include <abi/page.h>
  50
  51struct vm_area_struct;
  52
  53/*
  54 * These are used to make use of C type-checking..
  55 */
  56typedef struct { unsigned long pte_low; } pte_t;
  57#define pte_val(x)      ((x).pte_low)
  58
  59typedef struct { unsigned long pgd; } pgd_t;
  60typedef struct { unsigned long pgprot; } pgprot_t;
  61typedef struct page *pgtable_t;
  62
  63#define pgd_val(x)      ((x).pgd)
  64#define pgprot_val(x)   ((x).pgprot)
  65
  66#define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
  67
  68#define __pte(x)        ((pte_t) { (x) })
  69#define __pgd(x)        ((pgd_t) { (x) })
  70#define __pgprot(x)     ((pgprot_t) { (x) })
  71
  72#endif /* !__ASSEMBLY__ */
  73
  74#define PHYS_OFFSET             (CONFIG_RAM_BASE & ~(LOWMEM_LIMIT - 1))
  75#define PHYS_OFFSET_OFFSET      (CONFIG_RAM_BASE & (LOWMEM_LIMIT - 1))
  76#define ARCH_PFN_OFFSET         PFN_DOWN(CONFIG_RAM_BASE)
  77
  78#define PAGE_OFFSET     0x80000000
  79#define LOWMEM_LIMIT    0x40000000
  80
  81#define __pa(x)         ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
  82#define __va(x)         ((void *)((unsigned long)(x) + PAGE_OFFSET - \
  83                                  PHYS_OFFSET))
  84#define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
  85
  86#define MAP_NR(x)       PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \
  87                                 PHYS_OFFSET_OFFSET)
  88#define virt_to_page(x) (mem_map + MAP_NR(x))
  89
  90#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
  91                                VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  92
  93/*
  94 * main RAM and kernel working space are coincident at 0x80000000, but to make
  95 * life more interesting, there's also an uncached virtual shadow at 0xb0000000
  96 * - these mappings are fixed in the MMU
  97 */
  98
  99#define pfn_to_kaddr(x) __va(PFN_PHYS(x))
 100
 101#include <asm-generic/memory_model.h>
 102#include <asm-generic/getorder.h>
 103
 104#endif /* __ASM_CSKY_PAGE_H */
 105