/[gxemul]/trunk/src/memory_fast_v2h.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Annotation of /trunk/src/memory_fast_v2h.c

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Revision 4 - (hide annotations)
Mon Oct 8 16:18:00 2007 UTC (16 years, 6 months ago) by dpavlin
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File size: 6910 byte(s) 
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.707 2005/04/27 16:37:33 debug Exp $
20050408	Some minor updates to the wdc. Linux now doesn't complain
		anymore if a disk is non-present.
20050409	Various minor fixes (a bintrans bug, and some other things).
		The wdc seems to work with Playstation2 emulation, but there
		is a _long_ annoying delay when disks are detected.
		Fixing a really important bintrans bug (when devices and RAM
		are mixed within 4KB pages), which was triggered with
		NetBSD/playstation2 kernels.
20050410	Adding a dummy dev_ps2_ether (just so that NetBSD doesn't
		complain as much during bootup).
		Symbols starting with '$' are now ignored.
		Renaming dev_ps2_ohci.c to dev_ohci.c, etc.
20050411	Moving the bintrans-cache-isolation check from cpu_mips.c to
		cpu_mips_coproc.c. (I thought this would give a speedup, but
		it's not noticable.)
		Better playstation2 sbus interrupt code.
		Skip ahead many ticks if the count register is read manually.
		(This increases the speed of delay-loops that simply read
		the count register.)
20050412	Updates to the playstation2 timer/interrupt code.
		Some other minor updates.
20050413	NetBSD/cobalt runs from a disk image :-) including userland;
		updating the documentation on how to install NetBSD/cobalt
		using NetBSD/pmax (!).
		Some minor bintrans updates (no real speed improvement) and
		other minor updates (playstation2 now uses the -o options).
20050414	Adding a dummy x86 (and AMD64) mode.
20050415	Adding some (32-bit and 16-bit) x86 instructions.
		Adding some initial support for non-SCSI, non-IDE floppy
		images. (The x86 mode can boot from these, more or less.)
		Moving the devices/ and include/ directories to src/devices/
		and src/include/, respectively.
20050416	Continuing on the x86 stuff. (Adding pc_bios.c and some simple
		support for software interrupts in 16-bit mode.)
20050417	Ripping out most of the x86 instruction decoding stuff, trying
		to rewrite it in a cleaner way.
		Disabling some of the least working CPU families in the
		configure script (sparc, x86, alpha, hppa), so that they are
		not enabled by default.
20050418	Trying to fix the bug which caused problems when turning on
		and off bintrans interactively, by flushing the bintrans cache
		whenever bintrans is manually (re)enabled.
20050419	Adding the 'lswi' ppc instruction.
		Minor updates to the x86 instruction decoding.
20050420	Renaming x86 register name indices from R_xx to X86_R_xx (this
		makes building on Tru64 nicer).
20050422	Adding a check for duplicate MIPS TLB entries on tlbwr/tlbwi.
20050427	Adding screenshots to guestoses.html.
		Some minor fixes and testing for the next release.

==============  RELEASE 0.3.2  ==============
1 dpavlin 2 /*
2     * Copyright (C) 2004-2005 Anders Gavare. All rights reserved.
3     *
4     * Redistribution and use in source and binary forms, with or without
5     * modification, are permitted provided that the following conditions are met:
6     *
7     * 1. Redistributions of source code must retain the above copyright
8     * notice, this list of conditions and the following disclaimer.
9     * 2. 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     * 3. The name of the author may not be used to endorse or promote products
13     * derived from this software without specific prior written permission.
14     *
15     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18     * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25     * SUCH DAMAGE.
26     *
27     *
28 dpavlin 4 * $Id: memory_fast_v2h.c,v 1.13 2005/04/09 21:13:58 debug Exp $
29 dpavlin 2 *
30     * Fast virtual memory to host address, used by binary translated code.
31     */
32    
33     #include <stdio.h>
34     #include <stdlib.h>
35    
36     #include "bintrans.h"
37     #include "cpu.h"
38     #include "memory.h"
39     #include "cpu_mips.h"
40     #include "misc.h"
41    
42    
43     #ifdef BINTRANS
44    
45     /*
46     * fast_vaddr_to_hostaddr():
47     *
48     * Used by dynamically translated code. The caller should have made sure
49     * that the access is aligned correctly.
50     *
51     * Return value is a pointer to a host page + offset, if the page was
52     * writable (or writeflag was zero), if the virtual address was translatable
53     * to a paddr, and if the paddr was translatable to a host address.
54     *
55     * On error, NULL is returned. The caller (usually the dynamically
56     * generated machine code) must check for this.
57     */
58     unsigned char *fast_vaddr_to_hostaddr(struct cpu *cpu,
59     uint64_t vaddr, int writeflag)
60     {
61     int ok, i, n, start_and_stop;
62     uint64_t paddr, vaddr_page;
63     unsigned char *memblock;
64     size_t offset;
65     const int MAX = N_BINTRANS_VADDR_TO_HOST;
66    
67     /* printf("fast_vaddr_to_hostaddr(): cpu=%p, vaddr=%016llx, wf=%i\n",
68     cpu, (long long)vaddr, writeflag); */
69    
70     #if 0
71     /* Hm. This seems to work now, so this #if X can be removed. (?) */
72    
73     /*
74     * TODO:
75     *
76     * Why doesn't this work yet?
77     */
78     if ((vaddr & 0xc0000000ULL) >= 0xc0000000ULL && writeflag) {
79     return NULL;
80     }
81     #endif
82    
83    
84     vaddr_page = vaddr & ~0xfff;
85     i = start_and_stop = cpu->cd.mips.bintrans_next_index;
86     n = 0;
87     for (;;) {
88     if (cpu->cd.mips.bintrans_data_vaddr[i] == vaddr_page &&
89     cpu->cd.mips.bintrans_data_hostpage[i] != NULL &&
90     cpu->cd.mips.bintrans_data_writable[i] >= writeflag) {
91     uint64_t tmpaddr;
92     unsigned char *tmpptr;
93     int tmpwf;
94    
95     if (n < 3)
96     return cpu->cd.mips.bintrans_data_hostpage[i]
97     + (vaddr & 0xfff);
98    
99     cpu->cd.mips.bintrans_next_index = start_and_stop - 1;
100     if (cpu->cd.mips.bintrans_next_index < 0)
101     cpu->cd.mips.bintrans_next_index = MAX - 1;
102    
103     tmpptr = cpu->cd.mips.bintrans_data_hostpage[
104     cpu->cd.mips.bintrans_next_index];
105     tmpaddr = cpu->cd.mips.bintrans_data_vaddr[
106     cpu->cd.mips.bintrans_next_index];
107     tmpwf = cpu->cd.mips.bintrans_data_writable[
108     cpu->cd.mips.bintrans_next_index];
109    
110     cpu->cd.mips.bintrans_data_hostpage[
111     cpu->cd.mips.bintrans_next_index] =
112     cpu->cd.mips.bintrans_data_hostpage[i];
113     cpu->cd.mips.bintrans_data_vaddr[
114     cpu->cd.mips.bintrans_next_index] =
115     cpu->cd.mips.bintrans_data_vaddr[i];
116     cpu->cd.mips.bintrans_data_writable[
117     cpu->cd.mips.bintrans_next_index] =
118     cpu->cd.mips.bintrans_data_writable[i];
119    
120     cpu->cd.mips.bintrans_data_hostpage[i] = tmpptr;
121     cpu->cd.mips.bintrans_data_vaddr[i] = tmpaddr;
122     cpu->cd.mips.bintrans_data_writable[i] = tmpwf;
123    
124     return cpu->cd.mips.bintrans_data_hostpage[
125     cpu->cd.mips.bintrans_next_index] + (vaddr & 0xfff);
126     }
127    
128     n ++;
129     i ++;
130     if (i == MAX)
131     i = 0;
132     if (i == start_and_stop)
133     break;
134     }
135    
136     ok = cpu->translate_address(cpu, vaddr, &paddr,
137     (writeflag? FLAG_WRITEFLAG : 0) + FLAG_NOEXCEPTIONS);
138     /* printf("ok=%i\n", ok); */
139     if (!ok)
140     return NULL;
141    
142     for (i=0; i<cpu->mem->n_mmapped_devices; i++)
143 dpavlin 4 if (paddr >= (cpu->mem->dev_baseaddr[i] & ~0xfff) &&
144     paddr <= ((cpu->mem->dev_baseaddr[i] +
145     cpu->mem->dev_length[i] - 1) | 0xfff)) {
146 dpavlin 2 if (cpu->mem->dev_flags[i] & MEM_BINTRANS_OK) {
147     paddr -= cpu->mem->dev_baseaddr[i];
148    
149 dpavlin 4 /* Within a device _page_ but not within the
150     actual device? Then abort: */
151     if ((int64_t)paddr < 0 ||
152     paddr >= cpu->mem->dev_length[i])
153     return NULL;
154    
155 dpavlin 2 if (writeflag) {
156     uint64_t low_paddr = paddr & ~0xfff;
157     uint64_t high_paddr = paddr | 0xfff;
158     if (!(cpu->mem->dev_flags[i] &
159     MEM_BINTRANS_WRITE_OK))
160     return NULL;
161    
162     if (low_paddr < cpu->mem->
163     dev_bintrans_write_low[i])
164     cpu->mem->
165     dev_bintrans_write_low[i] =
166     low_paddr;
167     if (high_paddr > cpu->mem->
168     dev_bintrans_write_high[i])
169     cpu->mem->
170     dev_bintrans_write_high[i]
171     = high_paddr;
172     }
173    
174     cpu->cd.mips.bintrans_next_index --;
175     if (cpu->cd.mips.bintrans_next_index < 0)
176     cpu->cd.mips.bintrans_next_index =
177     MAX - 1;
178     cpu->cd.mips.bintrans_data_hostpage[cpu->
179     cd.mips.bintrans_next_index] = cpu->mem->
180     dev_bintrans_data[i] + (paddr & ~0xfff);
181     cpu->cd.mips.bintrans_data_vaddr[cpu->
182     cd.mips.bintrans_next_index] = vaddr_page;
183     cpu->cd.mips.bintrans_data_writable[cpu->
184     cd.mips.bintrans_next_index] = writeflag;
185     return cpu->mem->dev_bintrans_data[i] + paddr;
186     } else
187     return NULL;
188     }
189    
190     memblock = memory_paddr_to_hostaddr(cpu->mem, paddr,
191     writeflag? MEM_WRITE : MEM_READ);
192     if (memblock == NULL)
193     return NULL;
194    
195     offset = paddr & ((1 << BITS_PER_MEMBLOCK) - 1);
196    
197     if (writeflag)
198     bintrans_invalidate(cpu, paddr);
199    
200     cpu->cd.mips.bintrans_next_index --;
201     if (cpu->cd.mips.bintrans_next_index < 0)
202     cpu->cd.mips.bintrans_next_index = MAX - 1;
203     cpu->cd.mips.bintrans_data_hostpage[cpu->cd.mips.bintrans_next_index] =
204     memblock + (offset & ~0xfff);
205     cpu->cd.mips.bintrans_data_vaddr[cpu->cd.mips.bintrans_next_index] =
206     vaddr_page;
207     cpu->cd.mips.bintrans_data_writable[cpu->cd.mips.bintrans_next_index] =
208     writeflag; /* ok - 1; */
209    
210     return memblock + offset;
211     }
212    
213     #endif /* BINTRANS */
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