gem5/arch/alpha/vtophys.cc
Nathan Binkert 60a7bd950b CopyData and CopyString moved from kernel.cc to vtophys.cc
kernel.cc and kernel.hh moved to kern/tru64

--HG--
extra : convert_revision : 1b9123af03960b602a2d52dfa7b714280f9995aa
2003-10-13 16:09:33 -04:00

223 lines
6.3 KiB
C++

/*
* Copyright (c) 2003 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <string>
#include "targetarch/pmap.h"
#include "cpu/exec_context.hh"
#include "mem/functional_mem/physical_memory.hh"
#include "base/trace.hh"
#include "targetarch/vtophys.hh"
using namespace std;
inline Addr
level3_index(Addr vaddr)
{ return (vaddr >> ALPHA_PGSHIFT) & PTEMASK; }
inline Addr
level2_index(Addr vaddr)
{ return (vaddr >> (ALPHA_PGSHIFT + NPTEPG_SHIFT)) & PTEMASK; }
inline Addr
level1_index(Addr vaddr)
{ return (vaddr >> (ALPHA_PGSHIFT + 2 * NPTEPG_SHIFT)) & PTEMASK; }
Addr
kernel_pte_lookup(PhysicalMemory *pmem, Addr ptbr, Addr vaddr)
{
uint64_t level1_map = ptbr;
Addr level1_pte = level1_map + (level1_index(vaddr) << PTESHIFT);
uint64_t level1 = pmem->phys_read_qword(level1_pte);
if (!entry_valid(level1)) {
DPRINTF(VtoPhys, "level 1 PTE not valid, va = %#\n", vaddr);
return 0;
}
uint64_t level2_map = PMAP_PTE_PA(level1);
Addr level2_pte = level2_map + (level2_index(vaddr) << PTESHIFT);
uint64_t level2 = pmem->phys_read_qword(level2_pte);
if (!entry_valid(level2)) {
DPRINTF(VtoPhys, "level 2 PTE not valid, va = %#x\n", vaddr);
return 0;
}
uint64_t level3_map = PMAP_PTE_PA(level2);
Addr level3_pte = level3_map + (level3_index(vaddr) << PTESHIFT);
return level3_pte;
}
Addr
vtophys(PhysicalMemory *xc, Addr vaddr)
{
Addr paddr = 0;
if (vaddr < ALPHA_K0SEG_BASE)
DPRINTF(VtoPhys, "vtophys: invalid vaddr %#x", vaddr);
else if (vaddr < ALPHA_K1SEG_BASE)
paddr = ALPHA_K0SEG_TO_PHYS(vaddr);
else
panic("vtophys: ptbr is not set on virtual lookup");
DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
return paddr;
}
Addr
vtophys(ExecContext *xc, Addr vaddr)
{
Addr ptbr = xc->regs.ipr[AlphaISA::IPR_PALtemp20];
Addr paddr = 0;
if (vaddr < ALPHA_K0SEG_BASE) {
DPRINTF(VtoPhys, "vtophys: invalid vaddr %#x", vaddr);
} else if (vaddr < ALPHA_K1SEG_BASE) {
paddr = ALPHA_K0SEG_TO_PHYS(vaddr);
} else {
if (!ptbr)
panic("vtophys: ptbr is not set on virtual lookup");
Addr pte = kernel_pte_lookup(xc->physmem, ptbr, vaddr);
uint64_t entry = xc->physmem->phys_read_qword(pte);
if (pte && entry_valid(entry))
paddr = PMAP_PTE_PA(entry) | (vaddr & PGOFSET);
}
DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
return paddr;
}
uint8_t *
vtomem(ExecContext *xc, Addr vaddr, size_t len)
{
Addr paddr = vtophys(xc, vaddr);
return xc->physmem->dma_addr(paddr, len);
}
void
CopyData(ExecContext *xc, void *dest, Addr vaddr, size_t cplen)
{
Addr paddr;
char *dmaaddr;
char *dst = (char *)dest;
int len;
paddr = vtophys(xc, vaddr);
len = min((int)(ALPHA_PGBYTES - (paddr & PGOFSET)), (int)cplen);
dmaaddr = (char *)xc->physmem->dma_addr(paddr, len);
assert(dmaaddr);
memcpy(dst, dmaaddr, len);
if (len == cplen)
return;
cplen -= len;
dst += len;
vaddr += len;
while (cplen > ALPHA_PGBYTES) {
paddr = vtophys(xc, vaddr);
dmaaddr = (char *)xc->physmem->dma_addr(paddr, ALPHA_PGBYTES);
assert(dmaaddr);
memcpy(dst, dmaaddr, ALPHA_PGBYTES);
cplen -= ALPHA_PGBYTES;
dst += ALPHA_PGBYTES;
vaddr += ALPHA_PGBYTES;
}
if (cplen > 0) {
paddr = vtophys(xc, vaddr);
dmaaddr = (char *)xc->physmem->dma_addr(paddr, cplen);
assert(dmaaddr);
memcpy(dst, dmaaddr, cplen);
}
}
void
CopyString(ExecContext *xc, char *dst, Addr vaddr, size_t maxlen)
{
Addr paddr;
char *dmaaddr;
int len;
paddr = vtophys(xc, vaddr);
len = min((int)(ALPHA_PGBYTES - (paddr & PGOFSET)), (int)maxlen);
dmaaddr = (char *)xc->physmem->dma_addr(paddr, len);
assert(dmaaddr);
char *term = (char *)memchr(dmaaddr, 0, len);
if (term)
len = term - dmaaddr + 1;
memcpy(dst, dmaaddr, len);
if (term || len == maxlen)
return;
maxlen -= len;
dst += len;
vaddr += len;
while (maxlen > ALPHA_PGBYTES) {
paddr = vtophys(xc, vaddr);
dmaaddr = (char *)xc->physmem->dma_addr(paddr, ALPHA_PGBYTES);
assert(dmaaddr);
char *term = (char *)memchr(dmaaddr, 0, ALPHA_PGBYTES);
len = term ? (term - dmaaddr + 1) : ALPHA_PGBYTES;
memcpy(dst, dmaaddr, len);
if (term)
return;
maxlen -= ALPHA_PGBYTES;
dst += ALPHA_PGBYTES;
vaddr += ALPHA_PGBYTES;
}
if (maxlen > 0) {
paddr = vtophys(xc, vaddr);
dmaaddr = (char *)xc->physmem->dma_addr(paddr, maxlen);
assert(dmaaddr);
char *term = (char *)memchr(dmaaddr, 0, maxlen);
len = term ? (term - dmaaddr + 1) : maxlen;
memcpy(dst, dmaaddr, len);
maxlen -= len;
}
if (maxlen == 0)
dst[maxlen] = '\0';
}