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/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas <matt@3am-software.com> of Allegro Networks, Inc.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*-
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
*
* $NetBSD: pmap.c,v 1.28 2000/03/26 20:42:36 kleink Exp $
*/
/*-
* Copyright (C) 2001 Benno Rice.
* 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 Benno Rice ``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 TOOLS GMBH 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/powerpc/aim/moea64_native.c 234476 2012-04-20 00:45:23Z nwhitehorn $");
/*
* Native 64-bit page table operations for running without a hypervisor.
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/sched.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/kdb.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
#include <vm/vm_pageout.h>
#include <vm/vm_pager.h>
#include <machine/md_var.h>
#include <machine/mmuvar.h>
#include "mmu_oea64.h"
#include "mmu_if.h"
#include "moea64_if.h"
#define PTESYNC() __asm __volatile("ptesync");
#define TLBSYNC() __asm __volatile("tlbsync; ptesync");
#define SYNC() __asm __volatile("sync");
#define EIEIO() __asm __volatile("eieio");
#define VSID_HASH_MASK 0x0000007fffffffffULL
/*
* The tlbie instruction must be executed in 64-bit mode
* so we have to twiddle MSR[SF] around every invocation.
* Just to add to the fun, exceptions must be off as well
* so that we can't trap in 64-bit mode. What a pain.
*/
static struct mtx tlbie_mutex;
static __inline void
TLBIE(uint64_t vpn) {
#ifndef __powerpc64__
register_t vpn_hi, vpn_lo;
register_t msr;
register_t scratch;
#endif
vpn <<= ADDR_PIDX_SHFT;
vpn &= ~(0xffffULL << 48);
#ifdef __powerpc64__
mtx_lock(&tlbie_mutex);
__asm __volatile("tlbie %0" :: "r"(vpn) : "memory");
mtx_unlock(&tlbie_mutex);
__asm __volatile("eieio; tlbsync; ptesync");
#else
vpn_hi = (uint32_t)(vpn >> 32);
vpn_lo = (uint32_t)vpn;
/* Note: spin mutex is to disable exceptions while fiddling MSR */
mtx_lock_spin(&tlbie_mutex);
__asm __volatile("\
mfmsr %0; \
mr %1, %0; \
insrdi %1,%5,1,0; \
mtmsrd %1; isync; \
\
sld %1,%2,%4; \
or %1,%1,%3; \
tlbie %1; \
\
mtmsrd %0; isync; \
eieio; \
tlbsync; \
ptesync;"
: "=r"(msr), "=r"(scratch) : "r"(vpn_hi), "r"(vpn_lo), "r"(32), "r"(1)
: "memory");
mtx_unlock_spin(&tlbie_mutex);
#endif
}
#define DISABLE_TRANS(msr) msr = mfmsr(); mtmsr(msr & ~PSL_DR)
#define ENABLE_TRANS(msr) mtmsr(msr)
/*
* PTEG data.
*/
static struct lpteg *moea64_pteg_table;
/*
* PTE calls.
*/
static int moea64_pte_insert_native(mmu_t, u_int, struct lpte *);
static uintptr_t moea64_pvo_to_pte_native(mmu_t, const struct pvo_entry *);
static void moea64_pte_synch_native(mmu_t, uintptr_t pt,
struct lpte *pvo_pt);
static void moea64_pte_clear_native(mmu_t, uintptr_t pt,
struct lpte *pvo_pt, uint64_t vpn, uint64_t ptebit);
static void moea64_pte_change_native(mmu_t, uintptr_t pt,
struct lpte *pvo_pt, uint64_t vpn);
static void moea64_pte_unset_native(mmu_t mmu, uintptr_t pt,
struct lpte *pvo_pt, uint64_t vpn);
/*
* Utility routines.
*/
static void moea64_bootstrap_native(mmu_t mmup,
vm_offset_t kernelstart, vm_offset_t kernelend);
static void moea64_cpu_bootstrap_native(mmu_t, int ap);
static void tlbia(void);
static mmu_method_t moea64_native_methods[] = {
/* Internal interfaces */
MMUMETHOD(mmu_bootstrap, moea64_bootstrap_native),
MMUMETHOD(mmu_cpu_bootstrap, moea64_cpu_bootstrap_native),
MMUMETHOD(moea64_pte_synch, moea64_pte_synch_native),
MMUMETHOD(moea64_pte_clear, moea64_pte_clear_native),
MMUMETHOD(moea64_pte_unset, moea64_pte_unset_native),
MMUMETHOD(moea64_pte_change, moea64_pte_change_native),
MMUMETHOD(moea64_pte_insert, moea64_pte_insert_native),
MMUMETHOD(moea64_pvo_to_pte, moea64_pvo_to_pte_native),
{ 0, 0 }
};
MMU_DEF_INHERIT(oea64_mmu_native, MMU_TYPE_G5, moea64_native_methods,
0, oea64_mmu);
static __inline u_int
va_to_pteg(uint64_t vsid, vm_offset_t addr, int large)
{
uint64_t hash;
int shift;
shift = large ? moea64_large_page_shift : ADDR_PIDX_SHFT;
hash = (vsid & VSID_HASH_MASK) ^ (((uint64_t)addr & ADDR_PIDX) >>
shift);
return (hash & moea64_pteg_mask);
}
static void
moea64_pte_synch_native(mmu_t mmu, uintptr_t pt_cookie, struct lpte *pvo_pt)
{
struct lpte *pt = (struct lpte *)pt_cookie;
pvo_pt->pte_lo |= pt->pte_lo & (LPTE_REF | LPTE_CHG);
}
static void
moea64_pte_clear_native(mmu_t mmu, uintptr_t pt_cookie, struct lpte *pvo_pt,
uint64_t vpn, uint64_t ptebit)
{
struct lpte *pt = (struct lpte *)pt_cookie;
/*
* As shown in Section 7.6.3.2.3
*/
pt->pte_lo &= ~ptebit;
sched_pin();
TLBIE(vpn);
sched_unpin();
}
static void
moea64_pte_set_native(struct lpte *pt, struct lpte *pvo_pt)
{
pvo_pt->pte_hi |= LPTE_VALID;
/*
* Update the PTE as defined in section 7.6.3.1.
* Note that the REF/CHG bits are from pvo_pt and thus should have
* been saved so this routine can restore them (if desired).
*/
pt->pte_lo = pvo_pt->pte_lo;
EIEIO();
pt->pte_hi = pvo_pt->pte_hi;
PTESYNC();
/* Keep statistics for unlocked pages */
if (!(pvo_pt->pte_hi & LPTE_LOCKED))
moea64_pte_valid++;
}
static void
moea64_pte_unset_native(mmu_t mmu, uintptr_t pt_cookie, struct lpte *pvo_pt,
uint64_t vpn)
{
struct lpte *pt = (struct lpte *)pt_cookie;
/*
* Invalidate the pte.
*/
isync();
sched_pin();
pvo_pt->pte_hi &= ~LPTE_VALID;
pt->pte_hi &= ~LPTE_VALID;
PTESYNC();
TLBIE(vpn);
sched_unpin();
/*
* Save the reg & chg bits.
*/
moea64_pte_synch_native(mmu, pt_cookie, pvo_pt);
/* Keep statistics for unlocked pages */
if (!(pvo_pt->pte_hi & LPTE_LOCKED))
moea64_pte_valid--;
}
static void
moea64_pte_change_native(mmu_t mmu, uintptr_t pt, struct lpte *pvo_pt,
uint64_t vpn)
{
/*
* Invalidate the PTE
*/
moea64_pte_unset_native(mmu, pt, pvo_pt, vpn);
moea64_pte_set_native((struct lpte *)pt, pvo_pt);
}
static void
moea64_cpu_bootstrap_native(mmu_t mmup, int ap)
{
int i = 0;
#ifdef __powerpc64__
struct slb *slb = PCPU_GET(slb);
register_t seg0;
#endif
/*
* Initialize segment registers and MMU
*/
mtmsr(mfmsr() & ~PSL_DR & ~PSL_IR);
/*
* Install kernel SLB entries
*/
#ifdef __powerpc64__
__asm __volatile ("slbia");
__asm __volatile ("slbmfee %0,%1; slbie %0;" : "=r"(seg0) :
"r"(0));
for (i = 0; i < 64; i++) {
if (!(slb[i].slbe & SLBE_VALID))
continue;
__asm __volatile ("slbmte %0, %1" ::
"r"(slb[i].slbv), "r"(slb[i].slbe));
}
#else
for (i = 0; i < 16; i++)
mtsrin(i << ADDR_SR_SHFT, kernel_pmap->pm_sr[i]);
#endif
/*
* Install page table
*/
__asm __volatile ("ptesync; mtsdr1 %0; isync"
:: "r"((uintptr_t)moea64_pteg_table
| (uintptr_t)(flsl(moea64_pteg_mask >> 11))));
tlbia();
}
static void
moea64_bootstrap_native(mmu_t mmup, vm_offset_t kernelstart,
vm_offset_t kernelend)
{
vm_size_t size;
vm_offset_t off;
vm_paddr_t pa;
register_t msr;
moea64_early_bootstrap(mmup, kernelstart, kernelend);
/*
* Allocate PTEG table.
*/
size = moea64_pteg_count * sizeof(struct lpteg);
CTR2(KTR_PMAP, "moea64_bootstrap: %d PTEGs, %d bytes",
moea64_pteg_count, size);
/*
* We now need to allocate memory. This memory, to be allocated,
* has to reside in a page table. The page table we are about to
* allocate. We don't have BAT. So drop to data real mode for a minute
* as a measure of last resort. We do this a couple times.
*/
moea64_pteg_table = (struct lpteg *)moea64_bootstrap_alloc(size, size);
DISABLE_TRANS(msr);
bzero((void *)moea64_pteg_table, moea64_pteg_count * sizeof(struct lpteg));
ENABLE_TRANS(msr);
CTR1(KTR_PMAP, "moea64_bootstrap: PTEG table at %p", moea64_pteg_table);
/*
* Initialize the TLBIE lock. TLBIE can only be executed by one CPU.
*/
#ifdef __powerpc64__
mtx_init(&tlbie_mutex, "tlbie", NULL, MTX_DEF);
#else
mtx_init(&tlbie_mutex, "tlbie", NULL, MTX_SPIN);
#endif
moea64_mid_bootstrap(mmup, kernelstart, kernelend);
/*
* Add a mapping for the page table itself if there is no direct map.
*/
if (!hw_direct_map) {
size = moea64_pteg_count * sizeof(struct lpteg);
off = (vm_offset_t)(moea64_pteg_table);
DISABLE_TRANS(msr);
for (pa = off; pa < off + size; pa += PAGE_SIZE)
pmap_kenter(pa, pa);
ENABLE_TRANS(msr);
}
/* Bring up virtual memory */
moea64_late_bootstrap(mmup, kernelstart, kernelend);
}
static void
tlbia(void)
{
vm_offset_t i;
#ifndef __powerpc64__
register_t msr, scratch;
#endif
TLBSYNC();
for (i = 0; i < 0xFF000; i += 0x00001000) {
#ifdef __powerpc64__
__asm __volatile("tlbiel %0" :: "r"(i));
#else
__asm __volatile("\
mfmsr %0; \
mr %1, %0; \
insrdi %1,%3,1,0; \
mtmsrd %1; \
isync; \
\
tlbiel %2; \
\
mtmsrd %0; \
isync;"
: "=r"(msr), "=r"(scratch) : "r"(i), "r"(1));
#endif
}
EIEIO();
TLBSYNC();
}
static uintptr_t
moea64_pvo_to_pte_native(mmu_t mmu, const struct pvo_entry *pvo)
{
struct lpte *pt;
int pteidx, ptegidx;
uint64_t vsid;
/* If the PTEG index is not set, then there is no page table entry */
if (!PVO_PTEGIDX_ISSET(pvo))
return (-1);
/*
* Calculate the ptegidx
*/
vsid = PVO_VSID(pvo);
ptegidx = va_to_pteg(vsid, PVO_VADDR(pvo),
pvo->pvo_vaddr & PVO_LARGE);
/*
* We can find the actual pte entry without searching by grabbing
* the PTEG index from 3 unused bits in pvo_vaddr and by
* noticing the HID bit.
*/
if (pvo->pvo_pte.lpte.pte_hi & LPTE_HID)
ptegidx ^= moea64_pteg_mask;
pteidx = (ptegidx << 3) | PVO_PTEGIDX_GET(pvo);
if ((pvo->pvo_pte.lpte.pte_hi & LPTE_VALID) &&
!PVO_PTEGIDX_ISSET(pvo)) {
panic("moea64_pvo_to_pte: pvo %p has valid pte in pvo but no "
"valid pte index", pvo);
}
if ((pvo->pvo_pte.lpte.pte_hi & LPTE_VALID) == 0 &&
PVO_PTEGIDX_ISSET(pvo)) {
panic("moea64_pvo_to_pte: pvo %p has valid pte index in pvo "
"pvo but no valid pte", pvo);
}
pt = &moea64_pteg_table[pteidx >> 3].pt[pteidx & 7];
if ((pt->pte_hi ^ (pvo->pvo_pte.lpte.pte_hi & ~LPTE_VALID)) ==
LPTE_VALID) {
if ((pvo->pvo_pte.lpte.pte_hi & LPTE_VALID) == 0) {
panic("moea64_pvo_to_pte: pvo %p has valid pte in "
"moea64_pteg_table %p but invalid in pvo", pvo, pt);
}
if (((pt->pte_lo ^ pvo->pvo_pte.lpte.pte_lo) &
~(LPTE_M|LPTE_CHG|LPTE_REF)) != 0) {
panic("moea64_pvo_to_pte: pvo %p pte does not match "
"pte %p in moea64_pteg_table difference is %#x",
pvo, pt,
(uint32_t)(pt->pte_lo ^ pvo->pvo_pte.lpte.pte_lo));
}
return ((uintptr_t)pt);
}
if (pvo->pvo_pte.lpte.pte_hi & LPTE_VALID) {
panic("moea64_pvo_to_pte: pvo %p has invalid pte %p in "
"moea64_pteg_table but valid in pvo", pvo, pt);
}
return (-1);
}
static __inline int
moea64_pte_spillable_ident(u_int ptegidx)
{
struct lpte *pt;
int i, j, k;
/* Start at a random slot */
i = mftb() % 8;
k = -1;
for (j = 0; j < 8; j++) {
pt = &moea64_pteg_table[ptegidx].pt[(i + j) % 8];
if (pt->pte_hi & (LPTE_LOCKED | LPTE_WIRED))
continue;
/* This is a candidate, so remember it */
k = (i + j) % 8;
/* Try to get a page that has not been used lately */
if (!(pt->pte_lo & LPTE_REF))
return (k);
}
return (k);
}
static int
moea64_pte_insert_native(mmu_t mmu, u_int ptegidx, struct lpte *pvo_pt)
{
struct lpte *pt;
struct pvo_entry *pvo;
u_int pteg_bktidx;
int i;
/*
* First try primary hash.
*/
pteg_bktidx = ptegidx;
for (pt = moea64_pteg_table[pteg_bktidx].pt, i = 0; i < 8; i++, pt++) {
if ((pt->pte_hi & (LPTE_VALID | LPTE_LOCKED)) == 0) {
pvo_pt->pte_hi &= ~LPTE_HID;
moea64_pte_set_native(pt, pvo_pt);
return (i);
}
}
/*
* Now try secondary hash.
*/
pteg_bktidx ^= moea64_pteg_mask;
for (pt = moea64_pteg_table[pteg_bktidx].pt, i = 0; i < 8; i++, pt++) {
if ((pt->pte_hi & (LPTE_VALID | LPTE_LOCKED)) == 0) {
pvo_pt->pte_hi |= LPTE_HID;
moea64_pte_set_native(pt, pvo_pt);
return (i);
}
}
/*
* Out of luck. Find a PTE to sacrifice.
*/
pteg_bktidx = ptegidx;
i = moea64_pte_spillable_ident(pteg_bktidx);
if (i < 0) {
pteg_bktidx ^= moea64_pteg_mask;
i = moea64_pte_spillable_ident(pteg_bktidx);
}
if (i < 0) {
/* No freeable slots in either PTEG? We're hosed. */
panic("moea64_pte_insert: overflow");
return (-1);
}
if (pteg_bktidx == ptegidx)
pvo_pt->pte_hi &= ~LPTE_HID;
else
pvo_pt->pte_hi |= LPTE_HID;
/*
* Synchronize the sacrifice PTE with its PVO, then mark both
* invalid. The PVO will be reused when/if the VM system comes
* here after a fault.
*/
pt = &moea64_pteg_table[pteg_bktidx].pt[i];
if (pt->pte_hi & LPTE_HID)
pteg_bktidx ^= moea64_pteg_mask; /* PTEs indexed by primary */
LIST_FOREACH(pvo, &moea64_pvo_table[pteg_bktidx], pvo_olink) {
if (pvo->pvo_pte.lpte.pte_hi == pt->pte_hi) {
KASSERT(pvo->pvo_pte.lpte.pte_hi & LPTE_VALID,
("Invalid PVO for valid PTE!"));
moea64_pte_unset_native(mmu, (uintptr_t)pt,
&pvo->pvo_pte.lpte, pvo->pvo_vpn);
PVO_PTEGIDX_CLR(pvo);
moea64_pte_overflow++;
break;
}
}
KASSERT(pvo->pvo_pte.lpte.pte_hi == pt->pte_hi,
("Unable to find PVO for spilled PTE"));
/*
* Set the new PTE.
*/
moea64_pte_set_native(pt, pvo_pt);
return (i);
}