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