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

/* 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
 */
#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)

/*
 * NOTE: virtual isn't really correct, actually it should be the offset into the
 * memory node, but we have no highmem, so that works for now.
 * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
 * of the shifts unnecessary.
 */

#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;

/*
 * These are used to make use of C type-checking..
 */
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) })

#endif /* !__ASSEMBLY__ */

#define PHYS_OFFSET		(CONFIG_RAM_BASE & ~(LOWMEM_LIMIT - 1))
#define PHYS_OFFSET_OFFSET	(CONFIG_RAM_BASE & (LOWMEM_LIMIT - 1))
#define ARCH_PFN_OFFSET		PFN_DOWN(CONFIG_RAM_BASE)

#define	PAGE_OFFSET	0x80000000
#define LOWMEM_LIMIT	0x40000000

#define __pa(x)		((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
#define __va(x)		((void *)((unsigned long)(x) + PAGE_OFFSET - \
				  PHYS_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 VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
				VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

/*
 * main RAM and kernel working space are coincident at 0x80000000, but to make
 * life more interesting, there's also an uncached virtual shadow at 0xb0000000
 * - these mappings are fixed in the MMU
 */

#define pfn_to_kaddr(x)	__va(PFN_PHYS(x))

#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>

#endif /* __ASM_CSKY_PAGE_H */