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Line 47... Line 47...
47 
 *
 47 
 *
48 
 * Try to find PTE for faulting address.
 48 
 * Try to find PTE for faulting address.
49 
 * The AS->lock must be held on entry to this function.
 49 
 * The AS->lock must be held on entry to this function.
50 
 *
 50 
 *
51 
 * @param badvaddr Faulting virtual address.
 51 
 * @param badvaddr Faulting virtual address.
52 
 * @param istate Pointer to interrupted state.
 52 
 * @param istate   Pointer to interrupted state.
53 
 * @param pfrc Pointer to variable where as_page_fault() return code will be stored.
 53 
 * @param pfrc     Pointer to variable where as_page_fault() return code will be stored.
54 
 * @return         PTE on success, NULL otherwise.
 54 
 * @return         PTE on success, NULL otherwise.
55 
 *
 55 
 *
56 
 */
 56 
 */
57 
static pte_t *find_mapping_and_check(__address badvaddr, istate_t *istate, int *pfcr)
 57 
static pte_t *find_mapping_and_check(__address badvaddr, istate_t *istate, int *pfcr)
58 
{
 58 
{
Line 112... Line 112...
112 
    if (s)
 112 
    if (s)
113 
        sym2 = s;
 113 
        sym2 = s;
114 
    panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);
 114 
    panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);
115 
}
 115 
}
116 
 
 116 
 
- 
 
 117 
 
117 
static void pht_insert(const __address vaddr, const pfn_t pfn)
 118 
static void pht_insert(const __address vaddr, const pfn_t pfn)
118 
{
 119 
{
119 
    __u32 page = (vaddr >> 12) & 0xffff;
 120 
    __u32 page = (vaddr >> 12) & 0xffff;
120 
    __u32 api = (vaddr >> 22) & 0x3f;
 121 
    __u32 api = (vaddr >> 22) & 0x3f;
121 
    __u32 vsid;
 122 
    __u32 vsid;
Line 128... Line 129...
128 
   
 129 
   
129 
    /* Primary hash (xor) */
 130 
    /* Primary hash (xor) */
130 
    __u32 hash = ((vsid ^ page) & 0x3ff) << 3;
 131 
    __u32 hash = ((vsid ^ page) & 0x3ff) << 3;
131 
   
 132 
   
132 
    __u32 i;
 133 
    __u32 i;
- 
 
 134 
    bool found = false;
133 
    /* Find unused PTE in PTEG */
 135 
    /* Find unused PTE in PTEG */
134 
    for (i = 0; i < 8; i++) {
 136 
    for (i = 0; i < 8; i++) {
135 
        if (!phte[hash + i].v)
 137 
        if (!phte[hash + i].v) {
- 
 
 138 
            found = true;
136 
            break;
 139 
            break;
- 
 
 140 
        }
137 
    }
 141 
    }
138 
   
 142 
   
- 
 
 143 
    if (!found) {
139 
    // TODO: Check access/change bits, secondary hash
 144 
        /* Secondary hash (not) */
- 
 
 145 
        hash = ~hash;
- 
 
 146 
       
- 
 
 147 
        /* Find unused PTE in PTEG */
- 
 
 148 
        for (i = 0; i < 8; i++) {
- 
 
 149 
            if (!phte[hash + i].v) {
- 
 
 150 
                found = true;
- 
 
 151 
                break;
- 
 
 152 
            }
- 
 
 153 
        }
140 
   
 154 
       
141 
    if (i == 8)
 155 
        if (!found) {
- 
 
 156 
            // TODO: A/C precedence groups
142 
        i = page % 8;
 157 
            i = page % 8;
- 
 
 158 
        }
- 
 
 159 
    }
143 
   
 160 
   
144 
    phte[hash + i].v = 1;
 161 
    phte[hash + i].v = 1;
145 
    phte[hash + i].vsid = vsid;
 162 
    phte[hash + i].vsid = vsid;
146 
    phte[hash + i].h = 0;
 163 
    phte[hash + i].h = 0;
147 
    phte[hash + i].api = api;
 164 
    phte[hash + i].api = api;
Line 181... Line 198...
181 
    page_table_lock(AS, true);
 198 
    page_table_lock(AS, true);
182 
   
 199 
   
183 
    pte = find_mapping_and_check(badvaddr, istate, &pfcr);
 200 
    pte = find_mapping_and_check(badvaddr, istate, &pfcr);
184 
    if (!pte) {
 201 
    if (!pte) {
185 
        switch (pfcr) {
 202 
        switch (pfcr) {
186 
        case AS_PF_FAULT:
 203 
            case AS_PF_FAULT:
187 
            goto fail;
 204 
                goto fail;
188 
            break;
 205 
                break;
189 
        case AS_PF_DEFER:
 206 
            case AS_PF_DEFER:
190 
            /*
 207 
                /*
191 
             * The page fault came during copy_from_uspace()
 208 
                 * The page fault came during copy_from_uspace()
192 
             * or copy_to_uspace().
 209 
                 * or copy_to_uspace().
193 
             */
 210 
                 */
194 
            page_table_unlock(AS, true);
 211 
                page_table_unlock(AS, true);
195 
            return;
 212 
                return;
196 
        default:
 213 
            default:
197 
            panic("Unexpected pfrc (%d)\n", pfcr);
 214 
                panic("Unexpected pfrc (%d)\n", pfcr);
198 
            break;
 - 
 
199 
        }
 215 
        }
200 
    }
 216 
    }
201 
   
 217 
   
202 
    pte->a = 1; /* Record access to PTE */
 218 
    pte->a = 1; /* Record access to PTE */
203 
    pht_insert(badvaddr, pte->pfn);
 219 
    pht_insert(badvaddr, pte->pfn);
Line 212... Line 228...
212 
 
 228 
 
213 
 
 229 
 
214 
void pht_init(void)
 230 
void pht_init(void)
215 
{
 231 
{
216 
    memsetb((__address) phte, 1 << PHT_BITS, 0);
 232 
    memsetb((__address) phte, 1 << PHT_BITS, 0);
217 
   
 - 
 
218 
    /* Insert global kernel mapping */
 - 
 
219 
   
 - 
 
220 
    __address cur;
 - 
 
221 
    for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
 - 
 
222 
        pte_t *pte = page_mapping_find(AS_KERNEL, PA2KA(cur));
 - 
 
223 
        if ((pte) && (pte->p) && (pte->g))
 - 
 
224 
            pht_insert(PA2KA(cur), pte->pfn);
 - 
 
225 
    }
 - 
 
226 
}
 233 
}
227 
 
 234 
 
228 
 
 235 
 
229 
void page_arch_init(void)
 236 
void page_arch_init(void)
230 
{
 237 
{
Line 254... Line 261...
254 
        asm volatile (
 261 
        asm volatile (
255 
            "mtsdr1 %0\n"
 262 
            "mtsdr1 %0\n"
256 
            :
 263 
            :
257 
            : "r" ((__address) physical_phte)
 264 
            : "r" ((__address) physical_phte)
258 
        );
 265 
        );
259 
       
 - 
 
260 
        /* Invalidate block address translation registers,
 - 
 
261 
           thus remove the temporary mapping */
 - 
 
262 
//      invalidate_bat();
 - 
 
263 
    }
 266 
    }
264 
}
 267 
}