vtophys.cc revision 924 
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 "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    //@todo Andrew couldn't remember why he commented some of this code
100    //so I put it back in. Perhaps something to do with gdb debugging?
101    if (PC_PAL(vaddr)) {
102        paddr = vaddr & ~ULL(1);
103    } else if (!ptbr) {
104        paddr = vaddr;
105    } else {
106        if (vaddr >= ALPHA_K0SEG_BASE && vaddr <= ALPHA_K0SEG_END) {
107            paddr = ALPHA_K0SEG_TO_PHYS(vaddr);
108        } else {
109            Addr pte = kernel_pte_lookup(xc->physmem, ptbr, vaddr);
110            uint64_t entry = xc->physmem->phys_read_qword(pte);
111            if (pte && entry_valid(entry))
112                paddr = PMAP_PTE_PA(entry) | (vaddr & PGOFSET);
113        }
114    }
115
116
117    DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
118
119    return paddr;
120}
121
122uint8_t *
123ptomem(ExecContext *xc, Addr paddr, size_t len)
124{
125    return xc->physmem->dma_addr(paddr, len);
126}
127
128uint8_t *
129vtomem(ExecContext *xc, Addr vaddr, size_t len)
130{
131    Addr paddr = vtophys(xc, vaddr);
132    return xc->physmem->dma_addr(paddr, len);
133}
134
135void
136CopyData(ExecContext *xc, void *dest, Addr vaddr, size_t cplen)
137{
138    Addr paddr;
139    char *dmaaddr;
140    char *dst = (char *)dest;
141    int len;
142
143    paddr = vtophys(xc, vaddr);
144    len = min((int)(ALPHA_PGBYTES - (paddr & PGOFSET)), (int)cplen);
145    dmaaddr = (char *)xc->physmem->dma_addr(paddr, len);
146    assert(dmaaddr);
147
148    memcpy(dst, dmaaddr, len);
149    if (len == cplen)
150        return;
151
152    cplen -= len;
153    dst += len;
154    vaddr += len;
155
156    while (cplen > ALPHA_PGBYTES) {
157        paddr = vtophys(xc, vaddr);
158        dmaaddr = (char *)xc->physmem->dma_addr(paddr, ALPHA_PGBYTES);
159        assert(dmaaddr);
160
161        memcpy(dst, dmaaddr, ALPHA_PGBYTES);
162        cplen -= ALPHA_PGBYTES;
163        dst += ALPHA_PGBYTES;
164        vaddr += ALPHA_PGBYTES;
165    }
166
167    if (cplen > 0) {
168        paddr = vtophys(xc, vaddr);
169        dmaaddr = (char *)xc->physmem->dma_addr(paddr, cplen);
170        assert(dmaaddr);
171
172        memcpy(dst, dmaaddr, cplen);
173    }
174}
175
176void
177CopyString(ExecContext *xc, char *dst, Addr vaddr, size_t maxlen)
178{
179    Addr paddr;
180    char *dmaaddr;
181    int len;
182
183    paddr = vtophys(xc, vaddr);
184    len = min((int)(ALPHA_PGBYTES - (paddr & PGOFSET)), (int)maxlen);
185    dmaaddr = (char *)xc->physmem->dma_addr(paddr, len);
186    assert(dmaaddr);
187
188    char *term = (char *)memchr(dmaaddr, 0, len);
189    if (term)
190        len = term - dmaaddr + 1;
191
192    memcpy(dst, dmaaddr, len);
193
194    if (term || len == maxlen)
195        return;
196
197    maxlen -= len;
198    dst += len;
199    vaddr += len;
200
201    while (maxlen > ALPHA_PGBYTES) {
202        paddr = vtophys(xc, vaddr);
203        dmaaddr = (char *)xc->physmem->dma_addr(paddr, ALPHA_PGBYTES);
204        assert(dmaaddr);
205
206        char *term = (char *)memchr(dmaaddr, 0, ALPHA_PGBYTES);
207        len = term ? (term - dmaaddr + 1) : ALPHA_PGBYTES;
208
209        memcpy(dst, dmaaddr, len);
210        if (term)
211            return;
212
213        maxlen -= ALPHA_PGBYTES;
214        dst += ALPHA_PGBYTES;
215        vaddr += ALPHA_PGBYTES;
216    }
217
218    if (maxlen > 0) {
219        paddr = vtophys(xc, vaddr);
220        dmaaddr = (char *)xc->physmem->dma_addr(paddr, maxlen);
221        assert(dmaaddr);
222
223        char *term = (char *)memchr(dmaaddr, 0, maxlen);
224        len = term ? (term - dmaaddr + 1) : maxlen;
225
226        memcpy(dst, dmaaddr, len);
227
228        maxlen -= len;
229    }
230
231    if (maxlen == 0)
232        dst[maxlen] = '\0';
233}
234