Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Define variables and macros for DVMA allocation using rmaps.

This commit is contained in:
pk 1995-06-26 22:36:32 +00:00
parent 81447b8322
commit affbc4d346
1 changed files with 25 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
sys/arch/sparc/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.14 1995/06/26 06:56:14 cgd Exp $ */ /* $NetBSD: param.h,v 1.15 1995/06/26 22:36:32 pk Exp $ */
/* /*
* Copyright (c) 1992, 1993 * Copyright (c) 1992, 1993
@ -157,6 +157,30 @@ extern int nbpg, pgofset, pgshift;
*/ */
#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE))
/*
* dvmamap manages a range of DVMA addresses intended to create double
* mappings of physical memory. In a way, `dvmamap' is a submap of the
* VM map `phys_map'. The difference is the use of the `resource map'
* routines to manage page allocation, allowing DVMA addresses to be
* allocated and freed from within interrupt routines.
*
* Note that `phys_map' can still be used to allocate memory-backed pages
* in DVMA space.
*/
#ifdef _KERNEL
#ifndef LOCORE
extern vm_offset_t dvmabase;
extern struct map *dvmamap;
#endif
#endif
/*
* The dvma resource map is defined in page units, which are numbered 1 to N.
* Use these macros to convert to/from virtual addresses.
*/
#define rctov(n) (ctob(((n)-1))+dvmabase)
#define vtorc(v) ((btoc((v)-dvmabase))+1)
#ifdef _KERNEL #ifdef _KERNEL
#ifndef LOCORE #ifndef LOCORE
#define DELAY(n) delay(n) #define DELAY(n) delay(n)