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/* vax_mmu.h - VAX memory management (inlined)
Copyright (c) 1998-2013, Robert M Supnik
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik.
29-Nov-13 RMS Reworked unaligned flows
24-Oct-12 MB Added support for KA620 virtual addressing
21-Jul-08 RMS Removed inlining support
28-May-08 RMS Inlined physical memory routines
29-Apr-07 RMS Added address masking for system page table reads
22-Sep-05 RMS Fixed declarations (Sterling Garwood)
30-Sep-04 RMS Comment and formating changes
19-Sep-03 RMS Fixed upper/lower case linkage problems on VMS
01-Jun-03 RMS Fixed compilation problem with USE_ADDR64
This module contains the instruction simulators for
Read - read virtual
Write - write virtual
ReadL(P) - read aligned physical longword (physical context)
WriteL(P) - write aligned physical longword (physical context)
ReadB(W) - read aligned physical byte (word)
WriteB(W) - write aligned physical byte (word)
Test - test acccess
*/
#ifndef VAX_MMU_H_
#define VAX_MMU_H_ 1
#include "vax_defs.h"
#include <setjmp.h>
typedef struct {
int32 tag; /* tag */
int32 pte; /* pte */
} TLBENT;
extern uint32 *M;
extern UNIT cpu_unit;
extern DEVICE cpu_dev;
extern int32 mapen; /* map enable */
extern int32 mchk_va, mchk_ref; /* for mcheck */
extern TLBENT stlb[VA_TBSIZE], ptlb[VA_TBSIZE];
static const int32 insert[4] = {
0x00000000, 0x000000FF, 0x0000FFFF, 0x00FFFFFF
};
extern void zap_tb (int stb);
extern void zap_tb_ent (uint32 va);
extern t_bool chk_tb_ent (uint32 va);
extern void set_map_reg (void);
extern int32 ReadIO (uint32 pa, int32 lnt);
extern void WriteIO (uint32 pa, int32 val, int32 lnt);
extern int32 ReadReg (uint32 pa, int32 lnt);
extern void WriteReg (uint32 pa, int32 val, int32 lnt);
extern TLBENT fill (uint32 va, int32 lnt, int32 acc, int32 *stat);
static SIM_INLINE int32 ReadU (uint32 pa, int32 lnt);
static SIM_INLINE void WriteU (uint32 pa, int32 val, int32 lnt);
static SIM_INLINE int32 ReadB (uint32 pa);
static SIM_INLINE int32 ReadW (uint32 pa);
static SIM_INLINE int32 ReadL (uint32 pa);
static SIM_INLINE int32 ReadLP (uint32 pa);
static SIM_INLINE void WriteB (uint32 pa, int32 val);
static SIM_INLINE void WriteW (uint32 pa, int32 val);
static SIM_INLINE void WriteL (uint32 pa, int32 val);
/* Read and write virtual
These routines logically fall into three phases:
1. Look up the virtual address in the translation buffer, calling
the fill routine on a tag mismatch or access mismatch (invalid
tlb entries have access = 0 and thus always mismatch). The
fill routine handles all errors. If the resulting physical
address is aligned, do an aligned physical read or write.
2. Test for unaligned across page boundaries. If cross page, look
up the physical address of the second page. If not cross page,
the second physical address is the same as the first.
3. Using the two physical addresses, do an unaligned read or
write, with three cases: unaligned long, unaligned word within
a longword, unaligned word crossing a longword boundary.
Note that these routines do not handle quad or octa references.
*/
/* Read virtual
Inputs:
va = virtual address
lnt = length code (BWL)
acc = access code (KESU)
Output:
returned data, right justified in 32b longword
*/
static SIM_INLINE int32 Read (uint32 va, int32 lnt, int32 acc)
{
int32 vpn, off, tbi, pa;
int32 pa1, bo, sc, wl, wh;
TLBENT xpte;
mchk_va = va;
if (mapen) { /* mapping on? */
vpn = VA_GETVPN (va); /* get vpn, offset */
off = VA_GETOFF (va);
tbi = VA_GETTBI (vpn);
xpte = (va & VA_S0)? stlb[tbi]: ptlb[tbi]; /* access tlb */
if (((xpte.pte & acc) == 0) || (xpte.tag != vpn) ||
((acc & TLB_WACC) && ((xpte.pte & TLB_M) == 0)))
xpte = fill (va, lnt, acc, NULL); /* fill if needed */
pa = (xpte.pte & TLB_PFN) | off; /* get phys addr */
}
else {
pa = va & PAMASK;
off = 0;
}
if ((pa & (lnt - 1)) == 0) { /* aligned? */
if (lnt >= L_LONG) /* long, quad? */
return ReadL (pa);
if (lnt == L_WORD) /* word? */
return ReadW (pa);
return ReadB (pa); /* byte */
}
if (mapen && ((uint32)(off + lnt) > VA_PAGSIZE)) { /* cross page? */
vpn = VA_GETVPN (va + lnt); /* vpn 2nd page */
tbi = VA_GETTBI (vpn);
xpte = (va & VA_S0)? stlb[tbi]: ptlb[tbi]; /* access tlb */
if (((xpte.pte & acc) == 0) || (xpte.tag != vpn) ||
((acc & TLB_WACC) && ((xpte.pte & TLB_M) == 0)))
xpte = fill (va + lnt, lnt, acc, NULL); /* fill if needed */
pa1 = ((xpte.pte & TLB_PFN) | VA_GETOFF (va + 4)) & ~03;
}
else pa1 = ((pa + 4) & PAMASK) & ~03; /* not cross page */
bo = pa & 3;
if (lnt >= L_LONG) { /* lw unaligned? */
sc = bo << 3;
wl = ReadU (pa, L_LONG - bo); /* read both fragments */
wh = ReadU (pa1, bo); /* extract */
return ((wl | (wh << (32 - sc))) & LMASK);
}
else if (bo == 1) /* read within lw */
return ReadU (pa, L_WORD);
else {
wl = ReadU (pa, L_BYTE); /* word cross lw */
wh = ReadU (pa1, L_BYTE); /* read, extract */
return (wl | (wh << 8));
}
}
/* Write virtual
Inputs:
va = virtual address
val = data to be written, right justified in 32b lw
lnt = length code (BWL)
acc = access code (KESU)
Output:
none
*/
static SIM_INLINE void Write (uint32 va, int32 val, int32 lnt, int32 acc)
{
int32 vpn, off, tbi, pa;
int32 pa1, bo, sc;
TLBENT xpte;
mchk_va = va;
if (mapen) {
vpn = VA_GETVPN (va);
off = VA_GETOFF (va);
tbi = VA_GETTBI (vpn);
xpte = (va & VA_S0)? stlb[tbi]: ptlb[tbi]; /* access tlb */
if (((xpte.pte & acc) == 0) || (xpte.tag != vpn) ||
((xpte.pte & TLB_M) == 0))
xpte = fill (va, lnt, acc, NULL);
pa = (xpte.pte & TLB_PFN) | off;
}
else {
pa = va & PAMASK;
off = 0;
}
if ((pa & (lnt - 1)) == 0) { /* aligned? */
if (lnt >= L_LONG) /* long, quad? */
WriteL (pa, val);
else if (lnt == L_WORD) /* word? */
WriteW (pa, val);
else WriteB (pa, val); /* byte */
return;
}
if (mapen && ((uint32)(off + lnt) > VA_PAGSIZE)) {
vpn = VA_GETVPN (va + 4);
tbi = VA_GETTBI (vpn);
xpte = (va & VA_S0)? stlb[tbi]: ptlb[tbi]; /* access tlb */
if (((xpte.pte & acc) == 0) || (xpte.tag != vpn) ||
((xpte.pte & TLB_M) == 0))
xpte = fill (va + lnt, lnt, acc, NULL);
pa1 = ((xpte.pte & TLB_PFN) | VA_GETOFF (va + 4)) & ~03;
}
else pa1 = ((pa + 4) & PAMASK) & ~03;
bo = pa & 3;
if (lnt >= L_LONG) {
sc = bo << 3;
WriteU (pa, val & insert[L_LONG - bo], L_LONG - bo);
WriteU (pa1, (val >> (32 - sc)) & insert[bo], bo);
}
else if (bo == 1) /* read within lw */
WriteU (pa, val & WMASK, L_WORD);
else { /* word cross lw */
WriteU (pa, val & BMASK, L_BYTE);
WriteU (pa1, (val >> 8) & BMASK, L_BYTE);
}
return;
}
/* Test access to a byte (VAX PROBEx) */
static SIM_INLINE int32 Test (uint32 va, int32 acc, int32 *status)
{
int32 vpn, off, tbi;
TLBENT xpte;
*status = PR_OK; /* assume ok */
if (mapen) { /* mapping on? */
vpn = VA_GETVPN (va); /* get vpn, off */
off = VA_GETOFF (va);
tbi = VA_GETTBI (vpn);
xpte = (va & VA_S0)? stlb[tbi]: ptlb[tbi]; /* access tlb */
if ((xpte.pte & acc) && (xpte.tag == vpn)) /* TB hit, acc ok? */
return (xpte.pte & TLB_PFN) | off;
xpte = fill (va, L_BYTE, acc, status); /* fill TB */
if (*status == PR_OK)
return (xpte.pte & TLB_PFN) | off;
else return -1;
}
return va & PAMASK; /* ret phys addr */
}
/* Read aligned physical (in virtual context, unless indicated)
Inputs:
pa = physical address, naturally aligned
Output:
returned data, right justified in 32b longword
*/
static SIM_INLINE int32 ReadB (uint32 pa)
{
int32 dat;
if (ADDR_IS_MEM (pa))
dat = M[pa >> 2];
else {
mchk_ref = REF_V;
if (ADDR_IS_IO (pa))
dat = ReadIO (pa, L_BYTE);
else dat = ReadReg (pa, L_BYTE);
}
return ((dat >> ((pa & 3) << 3)) & BMASK);
}
static SIM_INLINE int32 ReadW (uint32 pa)
{
int32 dat;
if (ADDR_IS_MEM (pa))
dat = M[pa >> 2];
else {
mchk_ref = REF_V;
if (ADDR_IS_IO (pa))
dat = ReadIO (pa, L_WORD);
else dat = ReadReg (pa, L_WORD);
}
return ((dat >> ((pa & 2)? 16: 0)) & WMASK);
}
static SIM_INLINE int32 ReadL (uint32 pa)
{
if (ADDR_IS_MEM (pa))
return M[pa >> 2];
mchk_ref = REF_V;
if (ADDR_IS_IO (pa))
return ReadIO (pa, L_LONG);
return ReadReg (pa, L_LONG);
}
static SIM_INLINE int32 ReadLP (uint32 pa)
{
if (ADDR_IS_MEM (pa))
return M[pa >> 2];
mchk_va = pa;
mchk_ref = REF_P;
if (ADDR_IS_IO (pa))
return ReadIO (pa, L_LONG);
return ReadReg (pa, L_LONG);
}
/* Read unaligned physical (in virtual context)
Inputs:
pa = physical address
lnt = length in bytes (1, 2, or 3)
Output:
returned data
*/
static SIM_INLINE int32 ReadU (uint32 pa, int32 lnt)
{
int32 dat;
int32 sc = (pa & 3) << 3;
if (ADDR_IS_MEM (pa))
dat = M[pa >> 2];
else {
mchk_ref = REF_V;
if (ADDR_IS_IO (pa))
dat = ReadIOU (pa, lnt);
else dat = ReadRegU (pa, lnt);
}
return ((dat >> sc) & insert[lnt]);
}
/* Write aligned physical (in virtual context, unless indicated)
Inputs:
pa = physical address, naturally aligned
val = data to be written, right justified in 32b longword
Output:
none
*/
static SIM_INLINE void WriteB (uint32 pa, int32 val)
{
if (ADDR_IS_MEM (pa)) {
int32 id = pa >> 2;
int32 sc = (pa & 3) << 3;
int32 mask = 0xFF << sc;
M[id] = (M[id] & ~mask) | (val << sc);
}
else {
mchk_ref = REF_V;
if (ADDR_IS_IO (pa))
WriteIO (pa, val, L_BYTE);
else WriteReg (pa, val, L_BYTE);
}
return;
}
static SIM_INLINE void WriteW (uint32 pa, int32 val)
{
if (ADDR_IS_MEM (pa)) {
int32 id = pa >> 2;
M[id] = (pa & 2)? (M[id] & 0xFFFF) | (val << 16):
(M[id] & ~0xFFFF) | val;
}
else {
mchk_ref = REF_V;
if (ADDR_IS_IO (pa))
WriteIO (pa, val, L_WORD);
else WriteReg (pa, val, L_WORD);
}
return;
}
static SIM_INLINE void WriteL (uint32 pa, int32 val)
{
if (ADDR_IS_MEM (pa))
M[pa >> 2] = val;
else {
mchk_ref = REF_V;
if (ADDR_IS_IO (pa))
WriteIO (pa, val, L_LONG);
else WriteReg (pa, val, L_LONG);
}
return;
}
static SIM_INLINE void WriteLP (uint32 pa, int32 val)
{
if (ADDR_IS_MEM (pa))
M[pa >> 2] = val;
else {
mchk_va = pa;
mchk_ref = REF_P;
if (ADDR_IS_IO (pa))
WriteIO (pa, val, L_LONG);
else WriteReg (pa, val, L_LONG);
}
return;
}
/* Write unaligned physical (in virtual context)
Inputs:
pa = physical address
val = data to be written, right justified in 32b longword
lnt = length (1, 2, or 3 bytes)
Output:
none
*/
static SIM_INLINE void WriteU (uint32 pa, int32 val, int32 lnt)
{
if (ADDR_IS_MEM (pa)) {
int32 bo = pa & 3;
int32 sc = bo << 3;
M[pa >> 2] = (M[pa >> 2] & ~(insert[lnt] << sc)) | ((val & insert[lnt]) << sc);
}
else {
mchk_ref = REF_V;
if ADDR_IS_IO (pa)
WriteIOU (pa, val, lnt);
else WriteRegU (pa, val, lnt);
}
return;
}
#endif /* VAX_MMU_H_ */