tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
36extern void *memset(void *dest, int c, size_t l);
37extern 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
42struct page;
43
44#include <abi/page.h>
45
46struct vm_area_struct;
47
48typedef struct { unsigned long pte_low; } pte_t;
49#define pte_val(x) ((x).pte_low)
50
51typedef struct { unsigned long pgd; } pgd_t;
52typedef struct { unsigned long pgprot; } pgprot_t;
53typedef 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
64extern 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
73static 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 */