cregit-Linux how code gets into the kernel

Release 4.14 arch/parisc/include/asm/page.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _PARISC_PAGE_H

#define _PARISC_PAGE_H

#include <linux/const.h>

#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)

# define PAGE_SHIFT	12
#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)

# define PAGE_SHIFT	14
#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)

# define PAGE_SHIFT	16
#else
# error "unknown default kernel page size"
#endif

#define PAGE_SIZE	(_AC(1,UL) << PAGE_SHIFT)

#define PAGE_MASK	(~(PAGE_SIZE-1))


#ifndef __ASSEMBLY__

#include <asm/types.h>
#include <asm/cache.h>


#define clear_page(page)	clear_page_asm((void *)(page))

#define copy_page(to, from)	copy_page_asm((void *)(to), (void *)(from))

struct page;

void clear_page_asm(void *page);
void copy_page_asm(void *to, void *from);

#define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
			struct page *pg);

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

#define STRICT_MM_TYPECHECKS
#ifdef STRICT_MM_TYPECHECKS


typedef struct { unsigned long pte; } pte_t; 

/* either 32 or 64bit */

/* NOTE: even on 64 bits, these entries are __u32 because we allocate
 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */


typedef struct { __u32 pmd; } pmd_t;


typedef struct { __u32 pgd; } pgd_t;


typedef struct { unsigned long pgprot; } pgprot_t;


#define pte_val(x)	((x).pte)
/* These do not work lvalues, so make sure we don't use them as such. */

#define pmd_val(x)	((x).pmd + 0)

#define pgd_val(x)	((x).pgd + 0)

#define pgprot_val(x)	((x).pgprot)


#define __pte(x)	((pte_t) { (x) } )

#define __pmd(x)	((pmd_t) { (x) } )

#define __pgd(x)	((pgd_t) { (x) } )

#define __pgprot(x)	((pgprot_t) { (x) } )


#define __pmd_val_set(x,n) (x).pmd = (n)

#define __pgd_val_set(x,n) (x).pgd = (n)

#else
/*
 * .. while these make it easier on the compiler
 */

typedef unsigned long pte_t;

typedef         __u32 pmd_t;

typedef         __u32 pgd_t;

typedef unsigned long pgprot_t;


#define pte_val(x)      (x)

#define pmd_val(x)      (x)

#define pgd_val(x)      (x)

#define pgprot_val(x)   (x)


#define __pte(x)        (x)

#define __pmd(x)	(x)

#define __pgd(x)        (x)

#define __pgprot(x)     (x)


#define __pmd_val_set(x,n) (x) = (n)

#define __pgd_val_set(x,n) (x) = (n)

#endif /* STRICT_MM_TYPECHECKS */


typedef struct page *pgtable_t;


typedef struct __physmem_range {
	
unsigned long start_pfn;
	
unsigned long pages;       /* PAGE_SIZE pages */

} physmem_range_t;

extern physmem_range_t pmem_ranges[];
extern int npmem_ranges;

#endif /* !__ASSEMBLY__ */

/* WARNING: The definitions below must match exactly to sizeof(pte_t)
 * etc
 */
#ifdef CONFIG_64BIT

#define BITS_PER_PTE_ENTRY	3

#define BITS_PER_PMD_ENTRY	2

#define BITS_PER_PGD_ENTRY	2
#else

#define BITS_PER_PTE_ENTRY	2

#define BITS_PER_PMD_ENTRY	2

#define BITS_PER_PGD_ENTRY	BITS_PER_PMD_ENTRY
#endif

#define PGD_ENTRY_SIZE	(1UL << BITS_PER_PGD_ENTRY)

#define PMD_ENTRY_SIZE	(1UL << BITS_PER_PMD_ENTRY)

#define PTE_ENTRY_SIZE	(1UL << BITS_PER_PTE_ENTRY)


#define LINUX_GATEWAY_SPACE     0

/* This governs the relationship between virtual and physical addresses.
 * If you alter it, make sure to take care of our various fixed mapping
 * segments in fixmap.h */
#if defined(BOOTLOADER)

#define __PAGE_OFFSET	(0)		
/* bootloader uses physical addresses */
#else
#ifdef CONFIG_64BIT

#define __PAGE_OFFSET	(0x40000000)	
/* 1GB */
#else

#define __PAGE_OFFSET	(0x10000000)	
/* 256MB */
#endif
#endif /* BOOTLOADER */


#define PAGE_OFFSET		((unsigned long)__PAGE_OFFSET)

/* The size of the gateway page (we leave lots of room for expansion) */

#define GATEWAY_PAGE_SIZE	0x4000

/* The start of the actual kernel binary---used in vmlinux.lds.S
 * Leave some space after __PAGE_OFFSET for detecting kernel null
 * ptr derefs */

#define KERNEL_BINARY_TEXT_START	(__PAGE_OFFSET + 0x100000)

/* These macros don't work for 64-bit C code -- don't allow in C at all */
#ifdef __ASSEMBLY__

#   define PA(x)	((x)-__PAGE_OFFSET)

#   define VA(x)	((x)+__PAGE_OFFSET)
#endif

#define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)

#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))

#ifndef CONFIG_DISCONTIGMEM

#define pfn_valid(pfn)		((pfn) < max_mapnr)
#endif /* CONFIG_DISCONTIGMEM */

#ifdef CONFIG_HUGETLB_PAGE

#define HPAGE_SHIFT		PMD_SHIFT 
/* fixed for transparent huge pages */

#define HPAGE_SIZE      	((1UL) << HPAGE_SHIFT)

#define HPAGE_MASK		(~(HPAGE_SIZE - 1))

#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)

#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)

# define REAL_HPAGE_SHIFT	20 
/* 20 = 1MB */

# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
#elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)

# define REAL_HPAGE_SHIFT	22 
/* 22 = 4MB */

# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
#else

# define REAL_HPAGE_SHIFT	24 
/* 24 = 16MB */

# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
#endif
#endif /* CONFIG_HUGETLB_PAGE */


#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)


#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)

#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)


#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

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


#define PAGE0   ((struct zeropage *)__PAGE_OFFSET)

/* DEFINITION OF THE ZERO-PAGE (PAG0) */
/* based on work by Jason Eckhardt (jason@equator.com) */

#endif /* _PARISC_PAGE_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Helge Deller25438.96%834.78%
Matthew Wilcox16925.92%313.04%
Linus Torvalds (pre-git)16425.15%14.35%
John David Anglin223.37%28.70%
Kyle McMartin131.99%14.35%
Rolf Eike Beer91.38%14.35%
Martin Schwidefsky60.92%14.35%
David Mosberger-Tang40.61%14.35%
Sam Ravnborg40.61%14.35%
Kamezawa Hiroyuki30.46%14.35%
Stephen Rothwell20.31%14.35%
Arnd Bergmann10.15%14.35%
Greg Kroah-Hartman10.15%14.35%
Total652100.00%23100.00%
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