Viewing file:  page.h (2.69 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_CSKY_PAGE_H
#define __ASM_CSKY_PAGE_H
#include <asm/setup.h>
#include <asm/cache.h>
#include <linux/const.h>
/*
* PAGE_SHIFT determines the page size: 4KB
*/
#define PAGE_SHIFT 12
#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE - 1))
#define THREAD_SIZE (PAGE_SIZE * 2)
#define THREAD_MASK (~(THREAD_SIZE - 1))
#define THREAD_SHIFT (PAGE_SHIFT + 1)
/*
* For C-SKY "User-space:Kernel-space" is "2GB:2GB" fixed by hardware and there
* are two segment registers (MSA0 + MSA1) to mapping 512MB + 512MB physical
* address region. We use them mapping kernel 1GB direct-map address area and
* for more than 1GB of memory we use highmem.
*/
#define PAGE_OFFSET CONFIG_PAGE_OFFSET
#define SSEG_SIZE 0x20000000
#define LOWMEM_LIMIT (SSEG_SIZE * 2)
#define PHYS_OFFSET_OFFSET (CONFIG_DRAM_BASE & (SSEG_SIZE - 1))
#ifndef __ASSEMBLY__
#include <linux/pfn.h>
#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
#define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && \
(void *)(kaddr) < high_memory)
#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
extern void *memset(void *dest, int c, size_t l);
extern void *memcpy(void *to, const void *from, size_t l);
#define clear_page(page) memset((page), 0, PAGE_SIZE)
#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
#define phys_to_page(paddr) (pfn_to_page(PFN_DOWN(paddr)))
struct page;
#include <abi/page.h>
struct vm_area_struct;
typedef struct { unsigned long pte_low; } pte_t;
#define pte_val(x) ((x).pte_low)
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
typedef struct page *pgtable_t;
#define pgd_val(x) ((x).pgd)
#define pgprot_val(x) ((x).pgprot)
#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
#define __pte(x) ((pte_t) { (x) })
#define __pgd(x) ((pgd_t) { (x) })
#define __pgprot(x) ((pgprot_t) { (x) })
extern unsigned long va_pa_offset;
#define ARCH_PFN_OFFSET PFN_DOWN(va_pa_offset + PHYS_OFFSET_OFFSET)
#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + va_pa_offset)
#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - va_pa_offset))
#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
#define MAP_NR(x) PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \
PHYS_OFFSET_OFFSET)
#define virt_to_page(x) (mem_map + MAP_NR(x))
#define pfn_to_kaddr(x) __va(PFN_PHYS(x))
#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_CSKY_PAGE_H */
|