FreeBSD/Linux Kernel Cross Reference
sys/powerpc/ps3/mmu_ps3.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * 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 ``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("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/ktr.h>
    #include <sys/lock.h>
    #include <sys/msgbuf.h>
    #include <sys/mutex.h>
    #include <sys/proc.h>
    #include <sys/sysctl.h>
    #include <sys/systm.h>
    #include <sys/vmmeter.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/uma.h>
    
    #include <powerpc/aim/mmu_oea64.h>
    
    #include "mmu_if.h"
    #include "moea64_if.h"
    #include "ps3-hvcall.h"
    
    #define VSID_HASH_MASK          0x0000007fffffffffUL
    #define PTESYNC()               __asm __volatile("ptesync")
    
    extern int ps3fb_remap(void);
    
    static uint64_t mps3_vas_id;
    
    /*
     * Kernel MMU interface
     */
    
    static void     mps3_bootstrap(mmu_t mmup, vm_offset_t kernelstart,
                        vm_offset_t kernelend);
    static void     mps3_cpu_bootstrap(mmu_t mmup, int ap);
    static int64_t  mps3_pte_synch(mmu_t, struct pvo_entry *);
    static int64_t  mps3_pte_clear(mmu_t, struct pvo_entry *, uint64_t ptebit);
    static int64_t  mps3_pte_unset(mmu_t, struct pvo_entry *);
    static int      mps3_pte_insert(mmu_t, struct pvo_entry *);
    
    
    static mmu_method_t mps3_methods[] = {
            MMUMETHOD(mmu_bootstrap,        mps3_bootstrap),
            MMUMETHOD(mmu_cpu_bootstrap,    mps3_cpu_bootstrap),
    
            MMUMETHOD(moea64_pte_synch,     mps3_pte_synch),
            MMUMETHOD(moea64_pte_clear,     mps3_pte_clear),
            MMUMETHOD(moea64_pte_unset,     mps3_pte_unset),
            MMUMETHOD(moea64_pte_insert,    mps3_pte_insert),
    
            { 0, 0 }
    };
    
    MMU_DEF_INHERIT(ps3_mmu, "mmu_ps3", mps3_methods, 0, oea64_mmu);
    
    static struct mtx mps3_table_lock;
    
    static void
    mps3_bootstrap(mmu_t mmup, vm_offset_t kernelstart, vm_offset_t kernelend)
    {
            uint64_t final_pteg_count;
    
            mtx_init(&mps3_table_lock, "page table", NULL, MTX_DEF);
   
           moea64_early_bootstrap(mmup, kernelstart, kernelend);
   
           /* In case we had a page table already */
           lv1_destruct_virtual_address_space(0);
   
           /* Allocate new hardware page table */
           lv1_construct_virtual_address_space(
               20 /* log_2(moea64_pteg_count) */, 2 /* n page sizes */,
               (24UL << 56) | (16UL << 48) /* page sizes 16 MB + 64 KB */,
               &mps3_vas_id, &final_pteg_count
           );
   
           lv1_select_virtual_address_space(mps3_vas_id);
   
           moea64_pteg_count = final_pteg_count / sizeof(struct lpteg);
   
           moea64_mid_bootstrap(mmup, kernelstart, kernelend);
           moea64_late_bootstrap(mmup, kernelstart, kernelend);
   }
   
   static void
   mps3_cpu_bootstrap(mmu_t mmup, int ap)
   {
           struct slb *slb = PCPU_GET(aim.slb);
           register_t seg0;
           int i;
   
           mtmsr(mfmsr() & ~PSL_DR & ~PSL_IR);
   
           /*
            * Select the page table we configured above and set up the FB mapping
            * so we can have a console.
            */
           lv1_select_virtual_address_space(mps3_vas_id);
   
           if (!ap)
                   ps3fb_remap();
   
           /*
            * Install kernel SLB entries
            */
   
           __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));
           }
   }
   
   static int64_t
   mps3_pte_synch_locked(struct pvo_entry *pvo)
   {
           uint64_t halfbucket[4], rcbits;
           
           PTESYNC();
           lv1_read_htab_entries(mps3_vas_id, pvo->pvo_pte.slot & ~0x3UL,
               &halfbucket[0], &halfbucket[1], &halfbucket[2], &halfbucket[3],
               &rcbits);
   
           /* Check if present in page table */
           if ((halfbucket[pvo->pvo_pte.slot & 0x3] & LPTE_AVPN_MASK) !=
               ((pvo->pvo_vpn >> (ADDR_API_SHFT64 - ADDR_PIDX_SHFT)) &
               LPTE_AVPN_MASK))
                   return (-1);
           if (!(halfbucket[pvo->pvo_pte.slot & 0x3] & LPTE_VALID))
                   return (-1);
   
           /*
            * rcbits contains the low 12 bits of each PTE's 2nd part,
            * spaced at 16-bit intervals
            */
   
           return ((rcbits >> ((3 - (pvo->pvo_pte.slot & 0x3))*16)) &
               (LPTE_CHG | LPTE_REF));
   }
   
   static int64_t
   mps3_pte_synch(mmu_t mmu, struct pvo_entry *pvo)
   {
           int64_t retval;
   
           mtx_lock(&mps3_table_lock);
           retval = mps3_pte_synch_locked(pvo);
           mtx_unlock(&mps3_table_lock);
   
           return (retval);
   }
   
   static int64_t
   mps3_pte_clear(mmu_t mmu, struct pvo_entry *pvo, uint64_t ptebit)
   {
           int64_t refchg;
           struct lpte pte;
   
           mtx_lock(&mps3_table_lock);
   
           refchg = mps3_pte_synch_locked(pvo);
           if (refchg < 0) {
                   mtx_unlock(&mps3_table_lock);
                   return (refchg);
           }
   
           moea64_pte_from_pvo(pvo, &pte);
   
           pte.pte_lo |= refchg;
           pte.pte_lo &= ~ptebit;
           /* XXX: race on RC bits between write and sync. Anything to do? */
           lv1_write_htab_entry(mps3_vas_id, pvo->pvo_pte.slot, pte.pte_hi,
               pte.pte_lo);
           mtx_unlock(&mps3_table_lock);
   
           return (refchg);
   }
   
   static int64_t
   mps3_pte_unset(mmu_t mmu, struct pvo_entry *pvo)
   {
           int64_t refchg;
   
           mtx_lock(&mps3_table_lock);
           refchg = mps3_pte_synch_locked(pvo);
           if (refchg < 0) {
                   moea64_pte_overflow--;
                   mtx_unlock(&mps3_table_lock);
                   return (-1);
           }
           /* XXX: race on RC bits between unset and sync. Anything to do? */
           lv1_write_htab_entry(mps3_vas_id, pvo->pvo_pte.slot, 0, 0);
           mtx_unlock(&mps3_table_lock);
           moea64_pte_valid--;
   
           return (refchg & (LPTE_REF | LPTE_CHG));
   }
   
   static int
   mps3_pte_insert(mmu_t mmu, struct pvo_entry *pvo)
   {
           int result;
           struct lpte pte, evicted;
           uint64_t index;
   
           if (pvo->pvo_vaddr & PVO_HID) {
                   /* Hypercall needs primary PTEG */
                   pvo->pvo_vaddr &= ~PVO_HID;
                   pvo->pvo_pte.slot ^= (moea64_pteg_mask << 3);
           }
   
           pvo->pvo_pte.slot &= ~7UL;
           moea64_pte_from_pvo(pvo, &pte);
           evicted.pte_hi = 0;
           PTESYNC();
           mtx_lock(&mps3_table_lock);
           result = lv1_insert_htab_entry(mps3_vas_id, pvo->pvo_pte.slot,
               pte.pte_hi, pte.pte_lo, LPTE_LOCKED | LPTE_WIRED, 0,
               &index, &evicted.pte_hi, &evicted.pte_lo);
           mtx_unlock(&mps3_table_lock);
   
           if (result != 0) {
                   /* No freeable slots in either PTEG? We're hosed. */
                   panic("mps3_pte_insert: overflow (%d)", result);
                   return (-1);
           }
   
           /*
            * See where we ended up.
            */
           if ((index & ~7UL) != pvo->pvo_pte.slot)
                   pvo->pvo_vaddr |= PVO_HID;
           pvo->pvo_pte.slot = index;
   
           moea64_pte_valid++;
   
           if (evicted.pte_hi) {
                   KASSERT((evicted.pte_hi & (LPTE_WIRED | LPTE_LOCKED)) == 0,
                       ("Evicted a wired PTE"));
                   moea64_pte_valid--;
                   moea64_pte_overflow++;
           }
   
           return (0);
   }
   

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