Return to vm_param.h CVS log

Up to [GnuMach] / Gnu-Mach / i386 / util

Annotation of Gnu-Mach/i386/util/vm_param.h, revision 1.1.1.1

1.1       root        1: /* 
                      2:  * Mach Operating System
                      3:  * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
                      4:  * All Rights Reserved.
                      5:  * 
                      6:  * Permission to use, copy, modify and distribute this software and its
                      7:  * documentation is hereby granted, provided that both the copyright
                      8:  * notice and this permission notice appear in all copies of the
                      9:  * software, derivative works or modified versions, and any portions
                     10:  * thereof, and that both notices appear in supporting documentation.
                     11:  * 
                     12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     15:  * 
                     16:  * Carnegie Mellon requests users of this software to return to
                     17:  * 
                     18:  *  Software Distribution Coordinator  or  [email protected]
                     19:  *  School of Computer Science
                     20:  *  Carnegie Mellon University
                     21:  *  Pittsburgh PA 15213-3890
                     22:  * 
                     23:  * any improvements or extensions that they make and grant Carnegie Mellon
                     24:  * the rights to redistribute these changes.
                     25:  */
                     26: /*
                     27:  *     File:   vm_param.h
                     28:  *     Author: Avadis Tevanian, Jr.
                     29:  *     Date:   1985
                     30:  *
                     31:  *     I386 machine dependent virtual memory parameters.
                     32:  *     Most of the declarations are preceeded by I386_ (or i386_)
                     33:  *     which is OK because only I386 specific code will be using
                     34:  *     them.
                     35:  */
                     36: 
                     37: #ifndef        _I386_KERNEL_UTIL_VM_PARAM_H_
                     38: #define _I386_KERNEL_UTIL_VM_PARAM_H_
                     39: 
                     40: #include <mach/vm_param.h>
                     41: 
                     42: 
                     43: /* This variable is expected always to contain
                     44:    the kernel virtual address at which physical memory is mapped.
                     45:    It may change as paging is turned on or off.  */
                     46: extern vm_offset_t phys_mem_va;
                     47: 
                     48: 
                     49: /* Calculate a kernel virtual address from a physical address.  */
                     50: #define phystokv(pa)   ((vm_offset_t)(pa) + phys_mem_va)
                     51: 
                     52: /* Same, but in reverse.
                     53:    This only works for the region of kernel virtual addresses
                     54:    that directly map physical addresses.  */
                     55: #define kvtophys(va)   ((vm_offset_t)(va) - phys_mem_va)
                     56: 
                     57: 
                     58: /* This variable contains the kernel virtual address
                     59:    corresponding to linear address 0.
                     60:    In the absence of paging,
                     61:    linear addresses are always the same as physical addresses.  */
                     62: #ifndef linear_base_va
                     63: #define linear_base_va phys_mem_va
                     64: #endif
                     65: 
                     66: /* Convert between linear and kernel virtual addresses.  */
                     67: #define lintokv(la)    ((vm_offset_t)(la) + linear_base_va)
                     68: #define kvtolin(va)    ((vm_offset_t)(va) - linear_base_va)
                     69: 
                     70: 
                     71: /* This variable keeps track of where in physical memory
                     72:    our boot image was loaded.
                     73:    It holds the physical address
                     74:    corresponding to the boot image's virtual address 0.
                     75:    When paging is disabled, this is simply -phys_mem_va.
                     76:    However, when paging is enabled,
                     77:    phys_mem_va points to the place physical memory is mapped into exec space,
                     78:    and has no relationship to where in physical memory the boot image is.
                     79:    Thus, this variable always contains the location of the boot image
                     80:    whether or not paging is enabled.  */
                     81: extern vm_offset_t boot_image_pa;
                     82: 
                     83: /* Code segment we originally had when we started in real mode.
                     84:    Always equal to boot_image_pa >> 4.  */
                     85: extern unsigned short real_cs;
                     86: 
                     87: 
                     88: 
                     89: #endif /* _I386_KERNEL_UTIL_VM_PARAM_H_ */

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.