freebsd-dev/sys/powerpc/aim/moea64_if.m
Nathan Whitehorn bef5da7f98 Add an abstraction layer to the 64-bit AIM MMU's page table manipulation
logic to support modifying the page table through a hypervisor. This
uses KOBJ inheritance to provide subclasses of the base 64-bit AIM MMU
class with additional methods for page table manipulation.

Many thanks to Peter Grehan for suggesting this design and implementing
the MMU KOBJ inheritance mechanism.
2010-12-04 02:42:52 +00:00

116 lines
3.1 KiB
Objective-C

#-
# Copyright (c) 2010 Nathan Whitehorn
# 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.
#
# $FreeBSD$
#
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/systm.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
#include <machine/mmuvar.h>
/**
* MOEA64 kobj methods for 64-bit Book-S page table
* manipulation routines used, for example, by hypervisors.
*/
INTERFACE moea64;
/**
* Copy ref/changed bits from PTE referenced by _pt_cookie to _pvo_pt.
*/
METHOD void pte_synch {
mmu_t _mmu;
uintptr_t _pt_cookie;
struct lpte *_pvo_pt;
};
/**
* Clear bits ptebit (a mask) from the low word of the PTE referenced by
* _pt_cookie. Note that _pvo_pt is for reference use only -- the bit should
* NOT be cleared there.
*/
METHOD void pte_clear {
mmu_t _mmu;
uintptr_t _pt_cookie;
struct lpte *_pvo_pt;
uint64_t _vpn;
uint64_t _ptebit;
};
/**
* Invalidate the PTE referenced by _pt_cookie, synchronizing its validity
* and ref/changed bits after completion.
*/
METHOD void pte_unset {
mmu_t _mmu;
uintptr_t _pt_cookie;
struct lpte *_pvo_pt;
uint64_t _vpn;
};
/**
* Update the PTE referenced by _pt_cookie with the values in _pvo_pt,
* making sure that the values of ref/changed bits are preserved and
* synchronized back to _pvo_pt.
*/
METHOD void pte_change {
mmu_t _mmu;
uintptr_t _pt_cookie;
struct lpte *_pvo_pt;
uint64_t _vpn;
};
/**
* Insert the PTE _pvo_pt into the PTEG group _ptegidx, returning the index
* of the PTE in its group at completion, or -1 if no slots were free. Must
* not replace PTEs marked LPTE_WIRED or LPTE_LOCKED, and must set LPTE_HID
* and LPTE_VALID appropriately in _pvo_pt.
*/
METHOD int pte_insert {
mmu_t _mmu;
u_int _ptegidx;
struct lpte *_pvo_pt;
};
/**
* Return the page table reference cookie corresponding to _pvo, or -1 if
* the _pvo is not currently in the page table.
*/
METHOD uintptr_t pvo_to_pte {
mmu_t _mmu;
const struct pvo_entry *_pvo;
};