vtophys.cc revision 73 
1/*
2 * Copyright (c) 2003 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 "targetarch/pmap.h"
32
33#include "cpu/exec_context.hh"
34#include "mem/functional_mem/physical_memory.hh"
35#include "base/trace.hh"
36#include "targetarch/vtophys.hh"
37
38using namespace std;
39
40inline Addr
41level3_index(Addr vaddr)
42{ return (vaddr >> ALPHA_PGSHIFT) & PTEMASK; }
43
44inline Addr
45level2_index(Addr vaddr)
46{ return (vaddr >> (ALPHA_PGSHIFT + NPTEPG_SHIFT)) & PTEMASK; }
47
48inline Addr
49level1_index(Addr vaddr)
50{ return (vaddr >> (ALPHA_PGSHIFT + 2 * NPTEPG_SHIFT)) & PTEMASK; }
51
52Addr
53kernel_pte_lookup(PhysicalMemory *pmem, Addr ptbr, Addr vaddr)
54{
55    uint64_t level1_map = ptbr;
56    Addr level1_pte = level1_map + (level1_index(vaddr) << PTESHIFT);
57
58    uint64_t level1 = pmem->phys_read_qword(level1_pte);
59    if (!entry_valid(level1)) {
60        DPRINTF(VtoPhys, "level 1 PTE not valid, va = %#\n", vaddr);
61        return 0;
62    }
63
64    uint64_t level2_map = PMAP_PTE_PA(level1);
65    Addr level2_pte = level2_map + (level2_index(vaddr) << PTESHIFT);
66    uint64_t level2 = pmem->phys_read_qword(level2_pte);
67    if (!entry_valid(level2)) {
68        DPRINTF(VtoPhys, "level 2 PTE not valid, va = %#x\n", vaddr);
69        return 0;
70    }
71
72    uint64_t level3_map = PMAP_PTE_PA(level2);
73    Addr level3_pte = level3_map + (level3_index(vaddr) << PTESHIFT);
74
75    return level3_pte;
76}
77
78Addr
79vtophys(PhysicalMemory *xc, Addr vaddr)
80{
81    Addr paddr = 0;
82    if (vaddr < ALPHA_K0SEG_BASE)
83        DPRINTF(VtoPhys, "vtophys: invalid vaddr %#x", vaddr);
84    else if (vaddr < ALPHA_K1SEG_BASE)
85        paddr = ALPHA_K0SEG_TO_PHYS(vaddr);
86    else
87        panic("vtophys: ptbr is not set on virtual lookup");
88
89    DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
90
91    return paddr;
92}
93
94Addr
95vtophys(ExecContext *xc, Addr vaddr)
96{
97    Addr ptbr = xc->regs.ipr[AlphaISA::IPR_PALtemp20];
98    Addr paddr = 0;
99    if (vaddr < ALPHA_K0SEG_BASE) {
100        DPRINTF(VtoPhys, "vtophys: invalid vaddr %#x", vaddr);
101    } else if (vaddr < ALPHA_K1SEG_BASE) {
102        paddr = ALPHA_K0SEG_TO_PHYS(vaddr);
103    } else {
104        if (!ptbr)
105            panic("vtophys: ptbr is not set on virtual lookup");
106
107        Addr pte = kernel_pte_lookup(xc->physmem, ptbr, vaddr);
108        uint64_t entry = xc->physmem->phys_read_qword(pte);
109        if (pte && entry_valid(entry))
110            paddr = PMAP_PTE_PA(entry) | (vaddr & PGOFSET);
111    }
112
113    DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
114
115    return paddr;
116}
117
118uint8_t *
119vtomem(ExecContext *xc, Addr vaddr, size_t len)
120{
121    Addr paddr = vtophys(xc, vaddr);
122    return xc->physmem->dma_addr(paddr, len);
123}
124
125void
126CopyData(ExecContext *xc, void *dest, Addr vaddr, size_t cplen)
127{
128    Addr paddr;
129    char *dmaaddr;
130    char *dst = (char *)dest;
131    int len;
132
133    paddr = vtophys(xc, vaddr);
134    len = min((int)(ALPHA_PGBYTES - (paddr & PGOFSET)), (int)cplen);
135    dmaaddr = (char *)xc->physmem->dma_addr(paddr, len);
136    assert(dmaaddr);
137
138    memcpy(dst, dmaaddr, len);
139    if (len == cplen)
140        return;
141
142    cplen -= len;
143    dst += len;
144    vaddr += len;
145
146    while (cplen > ALPHA_PGBYTES) {
147        paddr = vtophys(xc, vaddr);
148        dmaaddr = (char *)xc->physmem->dma_addr(paddr, ALPHA_PGBYTES);
149        assert(dmaaddr);
150
151        memcpy(dst, dmaaddr, ALPHA_PGBYTES);
152        cplen -= ALPHA_PGBYTES;
153        dst += ALPHA_PGBYTES;
154        vaddr += ALPHA_PGBYTES;
155    }
156
157    if (cplen > 0) {
158        paddr = vtophys(xc, vaddr);
159        dmaaddr = (char *)xc->physmem->dma_addr(paddr, cplen);
160        assert(dmaaddr);
161
162        memcpy(dst, dmaaddr, cplen);
163    }
164}
165
166void
167CopyString(ExecContext *xc, char *dst, Addr vaddr, size_t maxlen)
168{
169    Addr paddr;
170    char *dmaaddr;
171    int len;
172
173    paddr = vtophys(xc, vaddr);
174    len = min((int)(ALPHA_PGBYTES - (paddr & PGOFSET)), (int)maxlen);
175    dmaaddr = (char *)xc->physmem->dma_addr(paddr, len);
176    assert(dmaaddr);
177
178    char *term = (char *)memchr(dmaaddr, 0, len);
179    if (term)
180        len = term - dmaaddr + 1;
181
182    memcpy(dst, dmaaddr, len);
183
184    if (term || len == maxlen)
185        return;
186
187    maxlen -= len;
188    dst += len;
189    vaddr += len;
190
191    while (maxlen > ALPHA_PGBYTES) {
192        paddr = vtophys(xc, vaddr);
193        dmaaddr = (char *)xc->physmem->dma_addr(paddr, ALPHA_PGBYTES);
194        assert(dmaaddr);
195
196        char *term = (char *)memchr(dmaaddr, 0, ALPHA_PGBYTES);
197        len = term ? (term - dmaaddr + 1) : ALPHA_PGBYTES;
198
199        memcpy(dst, dmaaddr, len);
200        if (term)
201            return;
202
203        maxlen -= ALPHA_PGBYTES;
204        dst += ALPHA_PGBYTES;
205        vaddr += ALPHA_PGBYTES;
206    }
207
208    if (maxlen > 0) {
209        paddr = vtophys(xc, vaddr);
210        dmaaddr = (char *)xc->physmem->dma_addr(paddr, maxlen);
211        assert(dmaaddr);
212
213        char *term = (char *)memchr(dmaaddr, 0, maxlen);
214        len = term ? (term - dmaaddr + 1) : maxlen;
215
216        memcpy(dst, dmaaddr, len);
217
218        maxlen -= len;
219    }
220
221    if (maxlen == 0)
222        dst[maxlen] = '\0';
223}
224