arch/sparc/include/asm/page_32.h

Source file repositories/reference/linux-study-clean/arch/sparc/include/asm/page_32.h

File Facts

System
Linux kernel
Corpus path
arch/sparc/include/asm/page_32.h
Extension
.h
Size
3659 bytes
Lines
137
Domain
Architecture Layer
Bucket
arch/sparc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct sparc_phys_banks {
  unsigned long base_addr;
  unsigned long num_bytes;
};

#define SPARC_PHYS_BANKS 32

extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];

/* passing structs on the Sparc slow us down tremendously... */

/* #define STRICT_MM_TYPECHECKS */

#ifdef STRICT_MM_TYPECHECKS
/*
 * These are used to make use of C type-checking..
 */
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long iopte; } iopte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long ctxd; } ctxd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
typedef struct { unsigned long iopgprot; } iopgprot_t;

#define pte_val(x)	((x).pte)
#define iopte_val(x)	((x).iopte)
#define pmd_val(x)      ((x).pmd)
#define pgd_val(x)	((x).pgd)
#define ctxd_val(x)	((x).ctxd)
#define pgprot_val(x)	((x).pgprot)
#define iopgprot_val(x)	((x).iopgprot)

#define __pte(x)	((pte_t) { (x) } )
#define __pmd(x)	((pmd_t) { { (x) }, })
#define __iopte(x)	((iopte_t) { (x) } )
#define __pgd(x)	((pgd_t) { (x) } )
#define __ctxd(x)	((ctxd_t) { (x) } )
#define __pgprot(x)	((pgprot_t) { (x) } )
#define __iopgprot(x)	((iopgprot_t) { (x) } )

#else
/*
 * .. while these make it easier on the compiler
 */
typedef unsigned long pte_t;
typedef unsigned long iopte_t;
typedef unsigned long pmd_t;
typedef unsigned long pgd_t;
typedef unsigned long ctxd_t;
typedef unsigned long pgprot_t;
typedef unsigned long iopgprot_t;

#define pte_val(x)	(x)
#define iopte_val(x)	(x)
#define pmd_val(x)      (x)
#define pgd_val(x)	(x)
#define ctxd_val(x)	(x)
#define pgprot_val(x)	(x)
#define iopgprot_val(x)	(x)

#define __pte(x)	(x)
#define __pmd(x)	(x)
#define __iopte(x)	(x)
#define __pgd(x)	(x)
#define __ctxd(x)	(x)
#define __pgprot(x)	(x)
#define __iopgprot(x)	(x)

#endif

typedef pte_t *pgtable_t;

#define TASK_UNMAPPED_BASE	0x50000000

#else /* !(__ASSEMBLER__) */

#define __pgprot(x)	(x)

#endif /* !(__ASSEMBLER__) */

#define PAGE_OFFSET	0xf0000000
#ifndef __ASSEMBLER__
extern unsigned long phys_base;
extern unsigned long pfn_base;
#endif
#define __pa(x)			((unsigned long)(x) - PAGE_OFFSET + phys_base)
#define __va(x)			((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))

#define virt_to_phys		__pa

Annotation

Implementation Notes