vtophys.cc revision 1110 
1/*
2 * Copyright (c) 2002-2004 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <string>
30
31#include "arch/alpha/pmap.h"
32#include "arch/alpha/vtophys.hh"
33#include "base/trace.hh"
34#include "cpu/exec_context.hh"
35#include "mem/functional_mem/physical_memory.hh"
36
37using namespace std;
38
39inline Addr
40level3_index(Addr vaddr)
41{ return (vaddr >> ALPHA_PGSHIFT) & PTEMASK; }
42
43inline Addr
44level2_index(Addr vaddr)
45{ return (vaddr >> (ALPHA_PGSHIFT + NPTEPG_SHIFT)) & PTEMASK; }
46
47inline Addr
48level1_index(Addr vaddr)
49{ return (vaddr >> (ALPHA_PGSHIFT + 2 * NPTEPG_SHIFT)) & PTEMASK; }
50
51Addr
52kernel_pte_lookup(PhysicalMemory *pmem, Addr ptbr, Addr vaddr)
53{
54    uint64_t level1_map = ptbr;
55    Addr level1_pte = level1_map + (level1_index(vaddr) << PTESHIFT);
56
57    uint64_t level1 = pmem->phys_read_qword(level1_pte);
58    if (!entry_valid(level1)) {
59        DPRINTF(VtoPhys, "level 1 PTE not valid, va = %#\n", vaddr);
60        return 0;
61    }
62
63    uint64_t level2_map = PMAP_PTE_PA(level1);
64    Addr level2_pte = level2_map + (level2_index(vaddr) << PTESHIFT);
65    uint64_t level2 = pmem->phys_read_qword(level2_pte);
66    if (!entry_valid(level2)) {
67        DPRINTF(VtoPhys, "level 2 PTE not valid, va = %#x\n", vaddr);
68        return 0;
69    }
70
71    uint64_t level3_map = PMAP_PTE_PA(level2);
72    Addr level3_pte = level3_map + (level3_index(vaddr) << PTESHIFT);
73
74    return level3_pte;
75}
76
77Addr
78vtophys(PhysicalMemory *xc, Addr vaddr)
79{
80    Addr paddr = 0;
81    if (vaddr < ALPHA_K0SEG_BASE)
82        DPRINTF(VtoPhys, "vtophys: invalid vaddr %#x", vaddr);
83    else if (vaddr < ALPHA_K1SEG_BASE)
84        paddr = ALPHA_K0SEG_TO_PHYS(vaddr);
85    else
86        panic("vtophys: ptbr is not set on virtual lookup");
87
88    DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
89
90    return paddr;
91}
92
93Addr
94vtophys(ExecContext *xc, Addr vaddr)
95{
96    Addr ptbr = xc->regs.ipr[AlphaISA::IPR_PALtemp20];
97    Addr paddr = 0;
98    //@todo Andrew couldn't remember why he commented some of this code
99    //so I put it back in. Perhaps something to do with gdb debugging?
100    if (PC_PAL(vaddr) && (vaddr < PAL_MAX)) {
101        paddr = vaddr & ~ULL(1);
102    } else {
103        if (vaddr >= ALPHA_K0SEG_BASE && vaddr <= ALPHA_K0SEG_END) {
104            paddr = ALPHA_K0SEG_TO_PHYS(vaddr);
105        } else if (!ptbr) {
106            paddr = vaddr;
107        } else {
108            Addr pte = kernel_pte_lookup(xc->physmem, ptbr, vaddr);
109            uint64_t entry = xc->physmem->phys_read_qword(pte);
110            if (pte && entry_valid(entry))
111                paddr = PMAP_PTE_PA(entry) | (vaddr & ALPHA_PGOFSET);
112        }
113    }
114
115
116    DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
117
118    return paddr;
119}
120
121uint8_t *
122ptomem(ExecContext *xc, Addr paddr, size_t len)
123{
124    return xc->physmem->dma_addr(paddr, len);
125}
126
127uint8_t *
128vtomem(ExecContext *xc, Addr vaddr, size_t len)
129{
130    Addr paddr = vtophys(xc, vaddr);
131    return xc->physmem->dma_addr(paddr, len);
132}
133
134void
135CopyOut(ExecContext *xc, void *dest, Addr src, size_t cplen)
136{
137    Addr paddr;
138    char *dmaaddr;
139    char *dst = (char *)dest;
140    int len;
141
142    paddr = vtophys(xc, src);
143    len = min((int)(ALPHA_PGBYTES - (paddr & ALPHA_PGOFSET)), (int)cplen);
144    dmaaddr = (char *)xc->physmem->dma_addr(paddr, len);
145    assert(dmaaddr);
146
147    memcpy(dst, dmaaddr, len);
148    if (len == cplen)
149        return;
150
151    cplen -= len;
152    dst += len;
153    src += len;
154
155    while (cplen > ALPHA_PGBYTES) {
156        paddr = vtophys(xc, src);
157        dmaaddr = (char *)xc->physmem->dma_addr(paddr, ALPHA_PGBYTES);
158        assert(dmaaddr);
159
160        memcpy(dst, dmaaddr, ALPHA_PGBYTES);
161        cplen -= ALPHA_PGBYTES;
162        dst += ALPHA_PGBYTES;
163        src += ALPHA_PGBYTES;
164    }
165
166    if (cplen > 0) {
167        paddr = vtophys(xc, src);
168        dmaaddr = (char *)xc->physmem->dma_addr(paddr, cplen);
169        assert(dmaaddr);
170
171        memcpy(dst, dmaaddr, cplen);
172    }
173}
174
175void
176CopyIn(ExecContext *xc, Addr dest, void *source, size_t cplen)
177{
178    Addr paddr;
179    char *dmaaddr;
180    char *src = (char *)source;
181    int len;
182
183    paddr = vtophys(xc, dest);
184    len = min((int)(ALPHA_PGBYTES - (paddr & ALPHA_PGOFSET)), (int)cplen);
185    dmaaddr = (char *)xc->physmem->dma_addr(paddr, len);
186    assert(dmaaddr);
187
188    memcpy(dmaaddr, src, len);
189    if (len == cplen)
190        return;
191
192    cplen -= len;
193    src += len;
194    dest += len;
195
196    while (cplen > ALPHA_PGBYTES) {
197        paddr = vtophys(xc, dest);
198        dmaaddr = (char *)xc->physmem->dma_addr(paddr, ALPHA_PGBYTES);
199        assert(dmaaddr);
200
201        memcpy(dmaaddr, src, ALPHA_PGBYTES);
202        cplen -= ALPHA_PGBYTES;
203        src += ALPHA_PGBYTES;
204        dest += ALPHA_PGBYTES;
205    }
206
207    if (cplen > 0) {
208        paddr = vtophys(xc, dest);
209        dmaaddr = (char *)xc->physmem->dma_addr(paddr, cplen);
210        assert(dmaaddr);
211
212        memcpy(dmaaddr, src, cplen);
213    }
214}
215
216void
217CopyString(ExecContext *xc, char *dst, Addr vaddr, size_t maxlen)
218{
219    Addr paddr;
220    char *dmaaddr;
221    int len;
222
223    paddr = vtophys(xc, vaddr);
224    len = min((int)(ALPHA_PGBYTES - (paddr & ALPHA_PGOFSET)), (int)maxlen);
225    dmaaddr = (char *)xc->physmem->dma_addr(paddr, len);
226    assert(dmaaddr);
227
228    char *term = (char *)memchr(dmaaddr, 0, len);
229    if (term)
230        len = term - dmaaddr + 1;
231
232    memcpy(dst, dmaaddr, len);
233
234    if (term || len == maxlen)
235        return;
236
237    maxlen -= len;
238    dst += len;
239    vaddr += len;
240
241    while (maxlen > ALPHA_PGBYTES) {
242        paddr = vtophys(xc, vaddr);
243        dmaaddr = (char *)xc->physmem->dma_addr(paddr, ALPHA_PGBYTES);
244        assert(dmaaddr);
245
246        char *term = (char *)memchr(dmaaddr, 0, ALPHA_PGBYTES);
247        len = term ? (term - dmaaddr + 1) : ALPHA_PGBYTES;
248
249        memcpy(dst, dmaaddr, len);
250        if (term)
251            return;
252
253        maxlen -= ALPHA_PGBYTES;
254        dst += ALPHA_PGBYTES;
255        vaddr += ALPHA_PGBYTES;
256    }
257
258    if (maxlen > 0) {
259        paddr = vtophys(xc, vaddr);
260        dmaaddr = (char *)xc->physmem->dma_addr(paddr, maxlen);
261        assert(dmaaddr);
262
263        char *term = (char *)memchr(dmaaddr, 0, maxlen);
264        len = term ? (term - dmaaddr + 1) : maxlen;
265
266        memcpy(dst, dmaaddr, len);
267
268        maxlen -= len;
269    }
270
271    if (maxlen == 0)
272        dst[maxlen] = '\0';
273}
274