freebsd-src/sys/powerpc/include/mmuvar.h
Peter Grehan f9c702db84 Insert a layer of indirection to the pmap code, using a kobj for
the interface. This allows run-time selection of MMU code, based
on CPU-type detection, or tunable-overrides when testing new code.

Pre-requisite for G5 support.

conf/files.powerpc
  - remove pmap.c
  - add mmu_if.h, mmu_oea.c, pmap_dispatch.c

powerpc/include/mmuvar.h
  - definitions for MMU implementations

powerpc/include/pmap.h
  - remove pmap_pte_spill declaration
  - add pmap_mmu_install declaration
  - size the phys_avail array
  - pmap_bootstrapped is now global-scope

powerpc/powerpc/machdep.c
  - call kobj_machdep_init early in the boot sequence to allow
    kobj usage prior to SI_SUB_LOCK
  - install the OEA pmap code. This will be moved to CPU-specific
    init code in the future.

powerpc/powerpc/mmu_if.m
  - Kobj MMU interface definitions

powerpc/powerpc/pmap_dispatch.c
  - central dispatch for pmap calls
  - contains the global mmu kobj and the routine to locate the
   the mmu implementation and init the kobj
2005-11-08 06:48:08 +00:00

97 lines
3.0 KiB
C

/*-
* Copyright (c) 2005 Peter Grehan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _MACHINE_MMUVAR_H_
#define _MACHINE_MMUVAR_H_
/*
* A PowerPC MMU implementation is declared with a kernel object and
* an associated method table, similar to a device driver.
*
* e.g.
*
* static mmu_method_t ppc8xx_methods[] = {
* MMUMETHOD(mmu_change_wiring, ppc8xx_mmu_change_wiring),
* MMUMETHOD(mmu_clear_modify, ppc8xx_mmu_clear_modify),
* MMUMETHOD(mmu_clear_reference, ppc8xx_mmu_clear_reference),
* ...
* MMUMETHOD(mmu_dev_direct_mapped, ppc8xx_mmu_dev_direct_mapped),
* { 0, 0 }
* };
*
* static mmu_def_t ppc8xx_mmu = {
* "ppc8xx",
* ppc8xx_methods,
* sizeof(ppc8xx_mmu_softc), // or 0 if no softc
* };
*
* MMU_DEF(ppc8xx_mmu);
*/
#include <sys/kobj.h>
struct mmu_kobj {
/*
* An MMU instance is a kernel object
*/
KOBJ_FIELDS;
/*
* Utility elements that an instance may use
*/
struct mtx mmu_mtx; /* available for instance use */
void *mmu_iptr; /* instance data pointer */
/*
* Opaque data that can be overlaid with an instance-private
* structure. MMU code can test that this is large enough at
* compile time with a sizeof() test againt it's softc. There
* is also a run-time test when the MMU kernel object is
* registered.
*/
#define MMU_OPAQUESZ 64
u_int mmu_opaque[MMU_OPAQUESZ];
};
typedef struct mmu_kobj *mmu_t;
typedef struct kobj_class mmu_def_t;
#define mmu_method_t kobj_method_t
#define MMUMETHOD KOBJMETHOD
#define MMU_DEF(name) DATA_SET(mmu_set, name)
/*
* Known MMU names
*/
#define MMU_TYPE_OEA "mmu_oea" /* 32-bit OEA */
#define MMU_TYPE_G5 "mmu_g5" /* 64-bit bridge (ibm 970) */
#define MMU_TYPE_8xx "mmu_8xx" /* 8xx quicc TLB */
#endif /* _MACHINE_MMUVAR_H_ */