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vm_param.h
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1997-04-27
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/*
* Copyright (c) 1994 NeXT Computer, Inc.
*
* sun sparc Family: Virtual memory constants.
*
* HISTORY
*
* 11 April 1994 Mahesh M. Kumar created at NeXT
* based on the i386 version by David E. Bohman
*
*/
#ifndef _MACH_SPARC_VM_PARAM_H_
#define _MACH_SPARC_VM_PARAM_H_
#define BYTE_SIZE 8 /* byte size in bits */
#define BYTE_MSF 0
#define SPARC_PGBYTES 4096 /* bytes per sun4m page */
#define SPARC_PGSHIFT 12 /* number of bits to shift for pages */
#define SPARC_PGALIGN 12 /* number of bits to shift for pages */
/*
* Convert bytes to pages and convert pages to bytes.
* No rounding is used.
*/
#define sparc_btop(x) (((unsigned)(x)) >> SPARC_PGSHIFT)
#define sparc_ptob(x) (((unsigned)(x)) << SPARC_PGSHIFT)
/*
* Round off or truncate to the nearest page. These will work
* for either addresses or counts. (i.e. 1 byte rounds to 1 page
* bytes.
*/
#define sparc_round_page(x) ((((unsigned)(x)) + SPARC_PGBYTES - 1) & \
~(SPARC_PGBYTES-1))
#define sparc_trunc_page(x) (((unsigned)(x)) & ~(SPARC_PGBYTES-1))
#define VM_MIN_ADDRESS ((vm_offset_t) 0)
#define VM_MAX_ADDRESS ((vm_offset_t) 0xF0000000)
#define KERNELBASE 0xF0000000
#define KERNELSIZE (16*1024*1024) /* 16 MB */
#define VM_KERNEL_LOAD_ADDRESS ((vm_offset_t)KERNELBASE)
#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t) 0xF0000000)
#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t) 0xFF000000)
/* except the last 16 MB for DVMA */
#define KERNSTACK_SIZE (4*SPARC_PGBYTES)
#define INTSTACK_SIZE (8*SPARC_PGBYTES)
/*
* Conversion between sun4m pages and VM pages
*/
#define trunc_sun_to_vm(p) (atop(trunc_page(sun_ptob(p))))
#define round_sun_to_vm(p) (atop(round_page(sun_ptob(p))))
#define vm_to_sun(p) (sun_btop(ptoa(p)))
/*
* Maximum alignment required by any data type for this architecture.
* (Use cache line size bytes for performance reasons....)
*/
#define MAX_DATA_ALIGNMENT 16 /* 16 bytes */
#endif _MACH_SPARC_VM_PARAM_H_