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_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && \
38 (void *)(kaddr) < high_memory)
39
40 extern void *memset(void *dest, int c, size_t l);
41 extern void *memcpy(void *to, const void *from, size_t l);
42
43 #define clear_page(page) memset((page), 0, PAGE_SIZE)
44 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
45
46 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
47 #define phys_to_page(paddr) (pfn_to_page(PFN_DOWN(paddr)))
48
49 struct page;
50
51 #include <abi/page.h>
52
53 struct vm_area_struct;
54
55 typedef struct { unsigned long pte_low; } pte_t;
56 #define pte_val(x) ((x).pte_low)
57
58 typedef struct { unsigned long pgd; } pgd_t;
59 typedef struct { unsigned long pgprot; } pgprot_t;
60 typedef struct page *pgtable_t;
61
62 #define pgd_val(x) ((x).pgd)
63 #define pgprot_val(x) ((x).pgprot)
64
65 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
66
67 #define __pte(x) ((pte_t) { (x) })
68 #define __pgd(x) ((pgd_t) { (x) })
69 #define __pgprot(x) ((pgprot_t) { (x) })
70
71 extern unsigned long va_pa_offset;
72
73 #define ARCH_PFN_OFFSET PFN_DOWN(va_pa_offset + PHYS_OFFSET_OFFSET)
74
75 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + va_pa_offset)
76 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - va_pa_offset))
77
78 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
79
virt_to_pfn(const void * kaddr)80 static inline unsigned long virt_to_pfn(const void *kaddr)
81 {
82 return __pa(kaddr) >> PAGE_SHIFT;
83 }
84
pfn_to_virt(unsigned long pfn)85 static inline void * pfn_to_virt(unsigned long pfn)
86 {
87 return (void *)((unsigned long)__va(pfn) << PAGE_SHIFT);
88 }
89
90 #define MAP_NR(x) PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \
91 PHYS_OFFSET_OFFSET)
92 #define virt_to_page(x) (mem_map + MAP_NR(x))
93
94 #define pfn_to_kaddr(x) __va(PFN_PHYS(x))
95
96 #include <asm-generic/memory_model.h>
97 #include <asm-generic/getorder.h>
98
99 #endif /* !__ASSEMBLY__ */
100 #endif /* __ASM_CSKY_PAGE_H */
101