root/arch/csky/include/asm/page.h

INCLUDED FROM

   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     0x80000000
  28 #define SSEG_SIZE       0x20000000
  29 #define LOWMEM_LIMIT    (SSEG_SIZE * 2)
  30 
  31 #define PHYS_OFFSET_OFFSET (CONFIG_RAM_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 
  44 extern void *memset(void *dest, int c, size_t l);
  45 extern 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 
  53 struct page;
  54 
  55 #include <abi/page.h>
  56 
  57 struct vm_area_struct;
  58 
  59 typedef struct { unsigned long pte_low; } pte_t;
  60 #define pte_val(x)      ((x).pte_low)
  61 
  62 typedef struct { unsigned long pgd; } pgd_t;
  63 typedef struct { unsigned long pgprot; } pgprot_t;
  64 typedef 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 
  75 extern 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 VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
  89                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  90 
  91 #define pfn_to_kaddr(x) __va(PFN_PHYS(x))
  92 
  93 #include <asm-generic/memory_model.h>
  94 #include <asm-generic/getorder.h>
  95 
  96 #endif /* !__ASSEMBLY__ */
  97 #endif /* __ASM_CSKY_PAGE_H */