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703 jermar 1
/*
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 * Copyright (C) 2001-2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/*
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 * This file contains address space manipulation functions.
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 * Roughly speaking, this is a higher-level client of
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 * Virtual Address Translation (VAT) subsystem.
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 */
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#include <mm/as.h>
727 jermar 36
#include <mm/asid.h>
703 jermar 37
#include <mm/page.h>
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#include <mm/frame.h>
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#include <mm/tlb.h>
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#include <mm/heap.h>
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#include <arch/mm/page.h>
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#include <genarch/mm/page_pt.h>
727 jermar 43
#include <mm/asid.h>
703 jermar 44
#include <arch/mm/asid.h>
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#include <arch/mm/as.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <synch/spinlock.h>
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#include <config.h>
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#include <list.h>
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#include <panic.h>
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#include <arch/asm.h>
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#include <debug.h>
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#include <memstr.h>
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#include <arch.h>
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#include <print.h>
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#define KAS_START_INDEX     PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)
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#define KAS_END_INDEX       PTL0_INDEX(KERNEL_ADDRESS_SPACE_END)
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#define KAS_INDICES     (1+(KAS_END_INDEX-KAS_START_INDEX))
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/*
704 jermar 63
 * Here we assume that PFN (Physical Frame Number) space
703 jermar 64
 * is smaller than the width of index_t. UNALLOCATED_PFN
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 * can be then used to mark mappings wich were not
704 jermar 66
 * yet allocated a physical frame.
703 jermar 67
 */
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#define UNALLOCATED_PFN     ((index_t) -1)
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/** Create address space. */
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/*
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 * FIXME: this interface must be meaningful for all possible VAT
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 *    (Virtual Address Translation) mechanisms.
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 */
727 jermar 75
as_t *as_create(pte_t *ptl0, int flags)
703 jermar 76
{
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    as_t *as;
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    as = (as_t *) malloc(sizeof(as_t));
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    if (as) {
727 jermar 81
        list_initialize(&as->as_with_asid_link);
703 jermar 82
        spinlock_initialize(&as->lock, "as_lock");
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        list_initialize(&as->as_area_head);
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727 jermar 85
        if (flags & AS_KERNEL)
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            as->asid = ASID_KERNEL;
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        else
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            as->asid = ASID_INVALID;
703 jermar 89
 
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        as->ptl0 = ptl0;
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        if (!as->ptl0) {
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            pte_t *src_ptl0, *dst_ptl0;
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            src_ptl0 = (pte_t *) PA2KA((__address) GET_PTL0_ADDRESS());
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            dst_ptl0 = (pte_t *) frame_alloc(FRAME_KA | FRAME_PANIC, ONE_FRAME, NULL);
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//          memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
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//          memcpy((void *) &dst_ptl0[KAS_START_INDEX], (void *) &src_ptl0[KAS_START_INDEX], KAS_INDICES);
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            memcpy((void *) dst_ptl0,(void *) src_ptl0, PAGE_SIZE);
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            as->ptl0 = (pte_t *) KA2PA((__address) dst_ptl0);
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        }
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    }
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    return as;
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}
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/** Create address space area of common attributes.
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 *
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 * The created address space area is added to the target address space.
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 *
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 * @param as Target address space.
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 * @param type Type of area.
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 * @param size Size of area in multiples of PAGE_SIZE.
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 * @param base Base address of area.
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 *
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 * @return Address space area on success or NULL on failure.
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 */
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as_area_t *as_area_create(as_t *as, as_area_type_t type, size_t size, __address base)
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{
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    ipl_t ipl;
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    as_area_t *a;
124
 
125
    if (base % PAGE_SIZE)
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        panic("addr not aligned to a page boundary");
127
 
128
    ipl = interrupts_disable();
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    spinlock_lock(&as->lock);
130
 
131
    /*
132
     * TODO: test as_area which is to be created doesn't overlap with an existing one.
133
     */
134
 
135
    a = (as_area_t *) malloc(sizeof(as_area_t));
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    if (a) {
137
        int i;
138
 
139
        a->mapping = (index_t *) malloc(size * sizeof(index_t));
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        if (!a->mapping) {
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            free(a);
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            spinlock_unlock(&as->lock);
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            interrupts_restore(ipl);
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            return NULL;
145
        }
146
 
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        for (i=0; i<size; i++) {
148
            /*
149
             * Frames will be allocated on-demand by
704 jermar 150
             * as_page_fault() or preloaded by
718 decky 151
             * as_area_set_mapping().
703 jermar 152
             */
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            a->mapping[i] = UNALLOCATED_PFN;
154
        }
155
 
156
        spinlock_initialize(&a->lock, "as_area_lock");
157
 
158
        link_initialize(&a->link);         
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        a->type = type;
160
        a->size = size;
161
        a->base = base;
162
 
163
        list_append(&a->link, &as->as_area_head);
164
 
165
    }
166
 
167
    spinlock_unlock(&as->lock);
168
    interrupts_restore(ipl);
704 jermar 169
 
703 jermar 170
    return a;
171
}
172
 
173
/** Load mapping for address space area.
174
 *
175
 * Initialize a->mapping.
176
 *
718 decky 177
 * @param a   Target address space area.
178
 * @param vpn Page number relative to area start.
179
 * @param pfn Frame number to map.
703 jermar 180
 */
718 decky 181
void as_area_set_mapping(as_area_t *a, index_t vpn, index_t pfn)
703 jermar 182
{
718 decky 183
    ASSERT(vpn < a->size);
184
    ASSERT(a->mapping[vpn] == UNALLOCATED_PFN);
185
    ASSERT(pfn != UNALLOCATED_PFN);
186
 
703 jermar 187
    ipl_t ipl;
188
 
189
    ipl = interrupts_disable();
190
    spinlock_lock(&a->lock);
191
 
718 decky 192
    a->mapping[vpn] = pfn;
193
 
703 jermar 194
    spinlock_unlock(&a->lock);
195
    interrupts_restore(ipl);
196
}
197
 
198
/** Handle page fault within the current address space.
199
 *
200
 * This is the high-level page fault handler.
201
 * Interrupts are assumed disabled.
202
 *
203
 * @param page Faulting page.
204
 *
704 jermar 205
 * @return 0 on page fault, 1 on success.
703 jermar 206
 */
207
int as_page_fault(__address page)
208
{
209
    int flags;
210
    link_t *cur;
211
    as_area_t *a, *area = NULL;
212
    index_t vpn;
213
    __address frame;
214
 
215
    ASSERT(AS);
216
    spinlock_lock(&AS->lock);
217
 
218
    /*
219
     * Search this areas of this address space for presence of 'page'.
220
     */
221
    for (cur = AS->as_area_head.next; cur != &AS->as_area_head; cur = cur->next) {
222
        a = list_get_instance(cur, as_area_t, link);
223
        spinlock_lock(&a->lock);
224
 
225
        if ((page >= a->base) && (page < a->base + a->size * PAGE_SIZE)) {
226
 
227
            /*
228
             * We found the area containing 'page'.
229
             * TODO: access checking
230
             */
231
 
232
            vpn = (page - a->base) / PAGE_SIZE;
233
            area = a;
234
            break;
235
        }
236
 
237
        spinlock_unlock(&a->lock);
238
    }
239
 
240
    if (!area) {
241
        /*
242
         * No area contained mapping for 'page'.
243
         * Signal page fault to low-level handler.
244
         */
245
        spinlock_unlock(&AS->lock);
246
        return 0;
247
    }
248
 
249
    /*
250
     * Note: area->lock is held.
251
     */
252
 
253
    /*
254
     * Decide if a frame needs to be allocated.
255
     * If so, allocate it and adjust area->mapping map.
256
     */
257
    if (area->mapping[vpn] == UNALLOCATED_PFN) {
258
        frame = frame_alloc(0, ONE_FRAME, NULL);
711 decky 259
        memsetb(PA2KA(frame), FRAME_SIZE, 0);
703 jermar 260
        area->mapping[vpn] = frame / FRAME_SIZE;
704 jermar 261
        ASSERT(area->mapping[vpn] != UNALLOCATED_PFN);
718 decky 262
    } else
703 jermar 263
        frame = area->mapping[vpn] * FRAME_SIZE;
264
 
265
    switch (area->type) {
266
        case AS_AREA_TEXT:
267
            flags = PAGE_EXEC | PAGE_READ | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE;
268
            break;
269
        case AS_AREA_DATA:
270
        case AS_AREA_STACK:
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            flags = PAGE_READ | PAGE_WRITE | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE;
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            break;
273
        default:
274
            panic("unexpected as_area_type_t %d", area->type);
275
    }
276
 
277
    /*
278
     * Map 'page' to 'frame'.
279
     * Note that TLB shootdown is not attempted as only new information is being
280
     * inserted into page tables.
281
     */
282
    page_mapping_insert(page, AS->asid, frame, flags, (__address) AS->ptl0);
283
 
284
    spinlock_unlock(&area->lock);
285
    spinlock_unlock(&AS->lock);
286
 
287
    return 1;
288
}
289
 
290
/** Install address space on CPU.
291
 *
292
 * @param as Address space.
293
 */
294
void as_install(as_t *as)
295
{
296
    ipl_t ipl;
297
 
727 jermar 298
    asid_install(as);
299
 
703 jermar 300
    ipl = interrupts_disable();
301
    spinlock_lock(&as->lock);
302
    ASSERT(as->ptl0);
303
    SET_PTL0_ADDRESS(as->ptl0);
304
    spinlock_unlock(&as->lock);
305
    interrupts_restore(ipl);
306
 
307
    /*
308
     * Perform architecture-specific steps.
727 jermar 309
     * (e.g. write ASID to hardware register etc.)
703 jermar 310
     */
311
    as_install_arch(as);
312
 
313
    AS = as;
314
}