| 1 | /*
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| 2 | * Copyright (C) 2005 Martin Decky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #include <arch/mm/page.h>
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| 30 | #include <genarch/mm/page_pt.h>
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| 31 | #include <arch/mm/frame.h>
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| 32 | #include <arch/asm.h>
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| 33 | #include <arch/interrupt.h>
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| 34 | #include <mm/frame.h>
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| 35 | #include <mm/page.h>
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| 36 | #include <mm/as.h>
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| 37 | #include <arch.h>
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| 38 | #include <arch/types.h>
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| 39 | #include <arch/exception.h>
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| 40 | #include <align.h>
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| 41 | #include <config.h>
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| 42 | #include <print.h>
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| 43 | #include <symtab.h>
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| 44 |
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| 45 | static phte_t *phte;
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| 46 |
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| 47 |
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| 48 | /** Try to find PTE for faulting address
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| 49 | *
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| 50 | * Try to find PTE for faulting address.
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| 51 | * The as->lock must be held on entry to this function
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| 52 | * if lock is true.
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| 53 | *
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| 54 | * @param as Address space.
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| 55 | * @param lock Lock/unlock the address space.
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| 56 | * @param badvaddr Faulting virtual address.
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| 57 | * @param access Access mode that caused the fault.
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| 58 | * @param istate Pointer to interrupted state.
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| 59 | * @param pfrc Pointer to variable where as_page_fault() return code will be stored.
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| 60 | * @return PTE on success, NULL otherwise.
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| 61 | *
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| 62 | */
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| 63 | static pte_t *find_mapping_and_check(as_t *as, bool lock, __address badvaddr, int access,
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| 64 | istate_t *istate, int *pfcr)
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| 65 | {
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| 66 | /*
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| 67 | * Check if the mapping exists in page tables.
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| 68 | */
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| 69 | pte_t *pte = page_mapping_find(as, badvaddr);
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| 70 | if ((pte) && (pte->p)) {
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| 71 | /*
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| 72 | * Mapping found in page tables.
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| 73 | * Immediately succeed.
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| 74 | */
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| 75 | return pte;
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| 76 | } else {
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| 77 | int rc;
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| 78 |
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| 79 | /*
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| 80 | * Mapping not found in page tables.
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| 81 | * Resort to higher-level page fault handler.
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| 82 | */
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| 83 | page_table_unlock(as, lock);
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| 84 | switch (rc = as_page_fault(badvaddr, access, istate)) {
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| 85 | case AS_PF_OK:
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| 86 | /*
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| 87 | * The higher-level page fault handler succeeded,
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| 88 | * The mapping ought to be in place.
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| 89 | */
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| 90 | page_table_lock(as, lock);
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| 91 | pte = page_mapping_find(as, badvaddr);
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| 92 | ASSERT((pte) && (pte->p));
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| 93 | return pte;
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| 94 | case AS_PF_DEFER:
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| 95 | page_table_lock(as, lock);
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| 96 | *pfcr = rc;
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| 97 | return NULL;
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| 98 | case AS_PF_FAULT:
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| 99 | page_table_lock(as, lock);
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| 100 | printf("Page fault.\n");
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| 101 | *pfcr = rc;
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| 102 | return NULL;
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| 103 | default:
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| 104 | panic("unexpected rc (%d)\n", rc);
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| 105 | }
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| 106 | }
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| 107 | }
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| 108 |
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| 109 |
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| 110 | static void pht_refill_fail(__address badvaddr, istate_t *istate)
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| 111 | {
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| 112 | char *symbol = "";
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| 113 | char *sym2 = "";
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| 114 |
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| 115 | char *s = get_symtab_entry(istate->pc);
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| 116 | if (s)
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| 117 | symbol = s;
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| 118 | s = get_symtab_entry(istate->lr);
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| 119 | if (s)
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| 120 | sym2 = s;
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| 121 | panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);
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| 122 | }
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| 123 |
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| 124 |
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| 125 | static void pht_insert(const __address vaddr, const pfn_t pfn)
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| 126 | {
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| 127 | __u32 page = (vaddr >> 12) & 0xffff;
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| 128 | __u32 api = (vaddr >> 22) & 0x3f;
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| 129 | __u32 vsid;
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| 130 |
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| 131 | asm volatile (
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| 132 | "mfsrin %0, %1\n"
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| 133 | : "=r" (vsid)
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| 134 | : "r" (vaddr)
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| 135 | );
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| 136 |
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| 137 | /* Primary hash (xor) */
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| 138 | __u32 h = 0;
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| 139 | __u32 hash = vsid ^ page;
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| 140 | __u32 base = (hash & 0x3ff) << 3;
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| 141 | __u32 i;
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| 142 | bool found = false;
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| 143 |
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| 144 | /* Find unused or colliding
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| 145 | PTE in PTEG */
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| 146 | for (i = 0; i < 8; i++) {
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| 147 | if ((!phte[base + i].v) || ((phte[base + i].vsid == vsid) && (phte[base + i].api == api))) {
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| 148 | found = true;
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| 149 | break;
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| 150 | }
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| 151 | }
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| 152 |
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| 153 | if (!found) {
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| 154 | /* Secondary hash (not) */
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| 155 | __u32 base2 = (~hash & 0x3ff) << 3;
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| 156 |
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| 157 | /* Find unused or colliding
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| 158 | PTE in PTEG */
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| 159 | for (i = 0; i < 8; i++) {
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| 160 | if ((!phte[base2 + i].v) || ((phte[base2 + i].vsid == vsid) && (phte[base2 + i].api == api))) {
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| 161 | found = true;
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| 162 | base = base2;
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| 163 | h = 1;
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| 164 | break;
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| 165 | }
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| 166 | }
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| 167 |
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| 168 | if (!found) {
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| 169 | // TODO: A/C precedence groups
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| 170 | i = page % 8;
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| 171 | }
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| 172 | }
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| 173 |
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| 174 | phte[base + i].v = 1;
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| 175 | phte[base + i].vsid = vsid;
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| 176 | phte[base + i].h = h;
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| 177 | phte[base + i].api = api;
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| 178 | phte[base + i].rpn = pfn;
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| 179 | phte[base + i].r = 0;
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| 180 | phte[base + i].c = 0;
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| 181 | phte[base + i].pp = 2; // FIXME
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| 182 | }
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| 183 |
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| 184 |
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| 185 | /** Process Instruction/Data Storage Interrupt
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| 186 | *
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| 187 | * @param data True if Data Storage Interrupt.
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| 188 | * @param istate Interrupted register context.
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| 189 | *
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| 190 | */
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| 191 | void pht_refill(int n, istate_t *istate)
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| 192 | {
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| 193 | __address badvaddr;
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| 194 | pte_t *pte;
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| 195 | int pfcr;
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| 196 | as_t *as;
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| 197 | bool lock;
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| 198 |
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| 199 | if (AS == NULL) {
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| 200 | as = AS_KERNEL;
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| 201 | lock = false;
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| 202 | } else {
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| 203 | as = AS;
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| 204 | lock = true;
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| 205 | }
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| 206 |
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| 207 | if (n == VECTOR_DATA_STORAGE) {
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| 208 | asm volatile (
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| 209 | "mfdar %0\n"
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| 210 | : "=r" (badvaddr)
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| 211 | );
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| 212 | } else
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| 213 | badvaddr = istate->pc;
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| 214 |
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| 215 | page_table_lock(as, lock);
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| 216 |
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| 217 | pte = find_mapping_and_check(as, lock, badvaddr, PF_ACCESS_READ /* FIXME */, istate, &pfcr);
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| 218 | if (!pte) {
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| 219 | switch (pfcr) {
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| 220 | case AS_PF_FAULT:
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| 221 | goto fail;
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| 222 | break;
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| 223 | case AS_PF_DEFER:
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| 224 | /*
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| 225 | * The page fault came during copy_from_uspace()
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| 226 | * or copy_to_uspace().
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| 227 | */
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| 228 | page_table_unlock(as, lock);
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| 229 | return;
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| 230 | default:
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| 231 | panic("Unexpected pfrc (%d)\n", pfcr);
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| 232 | }
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| 233 | }
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| 234 |
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| 235 | pte->a = 1; /* Record access to PTE */
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| 236 | pht_insert(badvaddr, pte->pfn);
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| 237 |
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| 238 | page_table_unlock(as, lock);
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| 239 | return;
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| 240 |
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| 241 | fail:
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| 242 | page_table_unlock(as, lock);
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| 243 | pht_refill_fail(badvaddr, istate);
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| 244 | }
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| 245 |
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| 246 |
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| 247 | void pht_init(void)
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| 248 | {
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| 249 | memsetb((__address) phte, 1 << PHT_BITS, 0);
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| 250 | }
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| 251 |
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| 252 |
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| 253 | void page_arch_init(void)
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| 254 | {
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| 255 | if (config.cpu_active == 1) {
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| 256 | page_mapping_operations = &pt_mapping_operations;
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| 257 |
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| 258 | __address cur;
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| 259 | int flags;
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| 260 |
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| 261 | /* Frames below 128 MB are mapped using BAT,
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| 262 | map rest of the physical memory */
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| 263 | for (cur = 128 << 20; cur < last_frame; cur += FRAME_SIZE) {
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| 264 | flags = PAGE_CACHEABLE;
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| 265 | if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))
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| 266 | flags |= PAGE_GLOBAL;
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| 267 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
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| 268 | }
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| 269 |
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| 270 | /* Allocate page hash table */
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| 271 | phte_t *physical_phte = (phte_t *) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA | FRAME_PANIC));
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| 272 | phte = (phte_t *) PA2KA((__address) physical_phte);
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| 273 |
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| 274 | ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0);
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| 275 | pht_init();
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| 276 |
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| 277 | asm volatile (
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| 278 | "mtsdr1 %0\n"
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| 279 | :
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| 280 | : "r" ((__address) physical_phte)
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| 281 | );
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| 282 | }
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| 283 | }
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| 284 |
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| 285 |
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| 286 | __address hw_map(__address physaddr, size_t size)
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| 287 | {
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| 288 | if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
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| 289 | panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
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| 290 |
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| 291 | __address virtaddr = PA2KA(last_frame);
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| 292 | pfn_t i;
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| 293 | for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
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| 294 | page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
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| 295 |
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| 296 | last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
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| 297 |
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| 298 | return virtaddr;
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| 299 | }
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