/[gxemul]/trunk/src/cpus/memory_ppc.c
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Contents of /trunk/src/cpus/memory_ppc.c

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Revision 34 - (show annotations)
Mon Oct 8 16:21:17 2007 UTC (16 years, 6 months ago) by dpavlin
File MIME type: text/plain
File size: 8219 byte(s) 
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1480 2007/02/19 01:34:42 debug Exp $
20061029	Changing usleep(1) calls in the debugger to usleep(10000)
20061107	Adding a new disk image option (-d o...) which sets the ISO9660
		filesystem base offset; also making some other hacks to allow
		NetBSD/dreamcast and homebrew demos/games to boot directly
		from a filesystem image.
		Moving Dreamcast-specific stuff in the documentation to its
		own page (dreamcast.html).
		Adding a border to the Dreamcast PVR framebuffer.
20061108	Adding a -T command line option (again?), for halting the
		emulator on unimplemented memory accesses.
20061109	Continuing on various SH4 and Dreamcast related things.
		The emulator should now halt on more unimplemented device
		accesses, instead of just printing a warning, forcing me to
		actually implement missing stuff :)
20061111	Continuing on SH4 and Dreamcast stuff.
		Adding a bogus Landisk (SH4) machine mode.
20061112	Implementing some parts of the Dreamcast GDROM device. With
		some ugly hacks, NetBSD can (barely) mount an ISO image.
20061113	NetBSD/dreamcast now starts booting from the Live CD image,
		but crashes randomly quite early on in the boot process.
20061122	Beginning on a skeleton interrupt.h and interrupt.c for the
		new interrupt subsystem.
20061124	Continuing on the new interrupt system; taking the first steps
		to attempt to connect CPUs (SuperH and MIPS) and devices
		(dev_cons and SH4 timer interrupts) to it. Many things will
		probably break from now on.
20061125	Converting dev_ns16550, dev_8253 to the new interrupt system.
		Attempting to begin to convert the ISA bus.
20061130	Incorporating a patch from Brian Foley for the configure
		script, which checks for X11 libs in /usr/X11R6/lib64 (which
		is used on some Linux systems).
20061227	Adding a note in the man page about booting from Dreamcast
		CDROM images (i.e. that no external kernel is needed).
20061229	Continuing on the interrupt system rewrite: beginning to
		convert more devices, adding abort() calls for legacy interrupt
		system calls so that everything now _has_ to be rewritten!
		Almost all machine modes are now completely broken.
20061230	More progress on removing old interrupt code, mostly related
		to the ISA bus + devices, the LCA bus (on AlphaBook1), and
		the Footbridge bus (for CATS). And some minor PCI stuff.
		Connecting the ARM cpu to the new interrupt system.
		The CATS, NetWinder, and QEMU_MIPS machine modes now work with
		the new interrupt system :)
20061231	Connecting PowerPC CPUs to the new interrupt system.
		Making PReP machines (IBM 6050) work again.
		Beginning to convert the GT PCI controller (for e.g. Malta
		and Cobalt emulation). Some things work, but not everything.
		Updating Copyright notices for 2007.
20070101	Converting dev_kn02 from legacy style to devinit; the 3max
		machine mode now works with the new interrupt system :-]
20070105	Beginning to convert the SGI O2 machine to the new interrupt
		system; finally converting O2 (IP32) devices to devinit, etc.
20070106	Continuing on the interrupt system redesign/rewrite; KN01
		(PMAX), KN230, and Dreamcast ASIC interrupts should work again,
		moving out stuff from machine.h and devices.h into the
		corresponding devices, beginning the rewrite of i80321
		interrupts, etc.
20070107	Beginning on the rewrite of Eagle interrupt stuff (PReP, etc).
20070117	Beginning the rewrite of Algor (V3) interrupts (finally
		changing dev_v3 into devinit style).
20070118	Removing the "bus" registry concept from machine.h, because
		it was practically meaningless.
		Continuing on the rewrite of Algor V3 ISA interrupts.
20070121	More work on Algor interrupts; they are now working again,
		well enough to run NetBSD/algor. :-)
20070122	Converting VR41xx (HPCmips) interrupts. NetBSD/hpcmips
		can be installed using the new interrupt system :-)
20070123	Making the testmips mode work with the new interrupt system.
20070127	Beginning to convert DEC5800 devices to devinit, and to the
		new interrupt system.
		Converting Playstation 2 devices to devinit, and converting
		the interrupt system. Also fixing a severe bug: the interrupt
		mask register on Playstation 2 is bitwise _toggled_ on writes.
20070128	Removing the dummy NetGear machine mode and the 8250 device
		(which was only used by the NetGear machine).
		Beginning to convert the MacPPC GC (Grand Central) interrupt
		controller to the new interrupt system.
		Converting Jazz interrupts (PICA61 etc.) to the new interrupt
		system. NetBSD/arc can be installed again :-)
		Fixing the JAZZ timer (hardcoding it at 100 Hz, works with
		NetBSD and it is better than a completely dummy timer as it
		was before).
		Converting dev_mp to the new interrupt system, although I
		haven't had time to actually test it yet.
		Completely removing src/machines/interrupts.c, cpu_interrupt
		and cpu_interrupt_ack in src/cpu.c, and
		src/include/machine_interrupts.h! Adding fatal error messages
		+ abort() in the few places that are left to fix.
		Converting dev_z8530 to the new interrupt system.
		FINALLY removing the md_int struct completely from the
		machine struct.
		SH4 fixes (adding a PADDR invalidation in the ITLB replacement
		code in memory_sh.c); the NetBSD/dreamcast LiveCD now runs
		all the way to the login prompt, and can be interacted with :-)
		Converting the CPC700 controller (PCI and interrupt controller
		for PM/PPC) to the new interrupt system.
20070129	Fixing MACE ISA interrupts (SGI IP32 emulation). Both NetBSD/
		sgimips' and OpenBSD/sgi's ramdisk kernels can now be
		interacted with again.
20070130	Moving out the MIPS multi_lw and _sw instruction combinations
		so that they are auto-generated at compile time instead.
20070131	Adding detection of amd64/x86_64 hosts in the configure script,
		for doing initial experiments (again :-) with native code
		generation.
		Adding a -k command line option to set the size of the dyntrans
		cache, and a -B command line option to disable native code
		generation, even if GXemul was compiled with support for
		native code generation for the specific host CPU architecture.
20070201	Experimenting with a skeleton for native code generation.
		Changing the default behaviour, so that native code generation
		is now disabled by default, and has to be enabled by using
		-b on the command line.
20070202	Continuing the native code generation experiments.
		Making PCI interrupts work for Footbridge again.
20070203	More native code generation experiments.
		Removing most of the native code generation experimental code,
		it does not make sense to include any quick hacks like this.
		Minor cleanup/removal of some more legacy MIPS interrupt code.
20070204	Making i80321 interrupts work again (for NetBSD/evbarm etc.),
		and fixing the timer at 100 Hz.
20070206	Experimenting with removing the wdc interrupt slowness hack.
20070207	Lowering the number of dyntrans TLB entries for MIPS from
		192 to 128, resulting in a minor speed improvement.
		Minor optimization to the code invalidation routine in
		cpu_dyntrans.c.
20070208	Increasing (experimentally) the nr of dyntrans instructions per
		loop from 60 to 120.
20070210	Commenting out (experimentally) the dyntrans_device_danger
		detection in memory_rw.c.
		Changing the testmips and baremips machines to use a revision 2
		MIPS64 CPU by default, instead of revision 1.
		Removing the dummy i960, IA64, x86, AVR32, and HP PA-RISC
		files, the PC bios emulation, and the Olivetti M700 (ARC) and
		db64360 emulation modes.
20070211	Adding an "mp" demo to the demos directory, which tests the
		SMP functionality of the testmips machine.
		Fixing PReP interrupts some more. NetBSD/prep now boots again.
20070216	Adding a "nop workaround" for booting Mach/PMAX to the
		documentation; thanks to Artur Bujdoso for the values.
		Converting more of the MacPPC interrupt stuff to the new
		system.
		Beginning to convert BeBox interrupts to the new system.
		PPC603e should NOT have the PPC_NO_DEC flag! Removing it.
		Correcting BeBox clock speed (it was set to 100 in the NetBSD
		bootinfo block, but should be 33000000/4), allowing NetBSD
		to start without using the (incorrect) PPC_NO_DEC hack.
20070217	Implementing (slow) AltiVec vector loads and stores, allowing
		NetBSD/macppc to finally boot using the GENERIC kernel :-)
		Updating the documentation with install instructions for
		NetBSD/macppc.
20070218-19	Regression testing for the release.

==============  RELEASE 0.4.4  ==============
1 /*
2 * Copyright (C) 2005-2007 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 * $Id: memory_ppc.c,v 1.27 2006/12/30 13:30:56 debug Exp $
29 *
30 * Included from cpu_ppc.c.
31 */
32
33
34 #include "ppc_bat.h"
35 #include "ppc_pte.h"
36
37
38 /*
39 * ppc_bat():
40 *
41 * BAT translation. Returns -1 if there was no BAT hit, >= 0 for a hit.
42 * (0 for access denied, 1 for read-only, and 2 for read-write access allowed.)
43 */
44 int ppc_bat(struct cpu *cpu, uint64_t vaddr, uint64_t *return_paddr, int flags,
45 int user)
46 {
47 int i, istart = 0, iend = 8, pp;
48
49 if (flags & FLAG_INSTR)
50 iend = 4;
51 else
52 istart = 4;
53
54 if (cpu->cd.ppc.bits != 32) {
55 fatal("TODO: ppc_bat() for non-32-bit\n");
56 exit(1);
57 }
58 if (cpu->cd.ppc.cpu_type.flags & PPC_601) {
59 fatal("TODO: ppc_bat() for PPC 601\n");
60 exit(1);
61 }
62
63 /* Scan either the 4 instruction BATs or the 4 data BATs: */
64 for (i=istart; i<iend; i++) {
65 int regnr = SPR_IBAT0U + i * 2;
66 uint32_t upper = cpu->cd.ppc.spr[regnr];
67 uint32_t lower = cpu->cd.ppc.spr[regnr + 1];
68 uint32_t phys = lower & BAT_RPN, ebs = upper & BAT_EPI;
69 uint32_t mask = ((upper & BAT_BL) << 15) | 0x1ffff;
70
71 /* Not valid in either supervisor or user mode? */
72 if (user && !(upper & BAT_Vu))
73 continue;
74 if (!user && !(upper & BAT_Vs))
75 continue;
76
77 /* Virtual address mismatch? Then skip. */
78 if ((vaddr & ~mask) != (ebs & ~mask))
79 continue;
80
81 *return_paddr = (vaddr & mask) | (phys & ~mask);
82
83 pp = lower & BAT_PP;
84 switch (pp) {
85 case BAT_PP_NONE:
86 return 0;
87 case BAT_PP_RO_S:
88 case BAT_PP_RO:
89 return (flags & FLAG_WRITEFLAG)? 0 : 1;
90 default:/* BAT_PP_RW: */
91 return 2;
92 }
93 }
94
95 return -1;
96 }
97
98
99 /*
100 * get_pte_low():
101 *
102 * Scan a PTE group for a cmp (compare) value.
103 *
104 * Returns 1 if the value was found, and *lowp is set to the low PTE word.
105 * Returns 0 if no match was found.
106 */
107 static int get_pte_low(struct cpu *cpu, uint64_t pteg_select,
108 uint32_t *lowp, uint32_t cmp)
109 {
110 unsigned char *d = memory_paddr_to_hostaddr(cpu->mem, pteg_select, 1);
111 int i;
112
113 for (i=0; i<8; i++) {
114 uint32_t *ep = (uint32_t *) (d + (i << 3)), upper;
115 upper = *ep;
116 upper = BE32_TO_HOST(upper);
117
118 /* Valid PTE, and correct api and vsid? */
119 if (upper == cmp) {
120 uint32_t lo = ep[1];
121 lo = BE32_TO_HOST(lo);
122 *lowp = lo;
123 return 1;
124 }
125 }
126
127 return 0;
128 }
129
130
131 /*
132 * ppc_vtp32():
133 *
134 * Virtual to physical address translation (32-bit mode).
135 *
136 * Returns 1 if a translation was found, 0 if none was found. However, finding
137 * a translation does not mean that it should be returned; there can be
138 * a permission violation. *resp is set to 0 for no access, 1 for read-only
139 * access, or 2 for read/write access.
140 */
141 static int ppc_vtp32(struct cpu *cpu, uint32_t vaddr, uint64_t *return_paddr,
142 int *resp, uint64_t msr, int writeflag, int instr)
143 {
144 int srn = (vaddr >> 28) & 15, api = (vaddr >> 22) & PTE_API;
145 int access, key, match;
146 uint32_t vsid = cpu->cd.ppc.sr[srn] & 0x00ffffff;
147 uint64_t sdr1 = cpu->cd.ppc.spr[SPR_SDR1], htaborg;
148 uint32_t hash1, hash2, pteg_select, tmp;
149 uint32_t lower_pte = 0, cmp;
150
151 htaborg = sdr1 & 0xffff0000UL;
152
153 /* Primary hash: */
154 hash1 = (vsid & 0x7ffff) ^ ((vaddr >> 12) & 0xffff);
155 tmp = (hash1 >> 10) & (sdr1 & 0x1ff);
156 pteg_select = htaborg & 0xfe000000;
157 pteg_select |= ((hash1 & 0x3ff) << 6);
158 pteg_select |= (htaborg & 0x01ff0000) | (tmp << 16);
159 cpu->cd.ppc.spr[SPR_HASH1] = pteg_select;
160 cmp = cpu->cd.ppc.spr[instr? SPR_ICMP : SPR_DCMP] =
161 PTE_VALID | api | (vsid << PTE_VSID_SHFT);
162 match = get_pte_low(cpu, pteg_select, &lower_pte, cmp);
163
164 /* Secondary hash: */
165 hash2 = hash1 ^ 0x7ffff;
166 tmp = (hash2 >> 10) & (sdr1 & 0x1ff);
167 pteg_select = htaborg & 0xfe000000;
168 pteg_select |= ((hash2 & 0x3ff) << 6);
169 pteg_select |= (htaborg & 0x01ff0000) | (tmp << 16);
170 cpu->cd.ppc.spr[SPR_HASH2] = pteg_select;
171 if (!match) {
172 cmp |= PTE_HID;
173 match = get_pte_low(cpu, pteg_select, &lower_pte, cmp);
174 }
175
176 *resp = 0;
177
178 if (!match)
179 return 0;
180
181 /* Non-executable, or Guarded page? */
182 if (instr && cpu->cd.ppc.sr[srn] & SR_NOEXEC)
183 return 1;
184 if (instr && lower_pte & PTE_G)
185 return 1;
186
187 access = lower_pte & PTE_PP;
188 *return_paddr = (lower_pte & PTE_RPGN) | (vaddr & ~PTE_RPGN);
189
190 key = (cpu->cd.ppc.sr[srn] & SR_PRKEY && msr & PPC_MSR_PR) ||
191 (cpu->cd.ppc.sr[srn] & SR_SUKEY && !(msr & PPC_MSR_PR));
192
193 if (key) {
194 switch (access) {
195 case 1:
196 case 3: *resp = writeflag? 0 : 1;
197 break;
198 case 2: *resp = 2;
199 break;
200 }
201 } else {
202 switch (access) {
203 case 3: *resp = writeflag? 0 : 1;
204 break;
205 default:*resp = 2;
206 }
207 }
208
209 return 1;
210 }
211
212
213 /*
214 * ppc_translate_v2p():
215 *
216 * Don't call this function if userland_emul is non-NULL, or cpu is NULL.
217 *
218 * Return values:
219 * 0 Failure
220 * 1 Success, the page is readable only
221 * 2 Success, the page is read/write
222 */
223 int ppc_translate_v2p(struct cpu *cpu, uint64_t vaddr,
224 uint64_t *return_paddr, int flags)
225 {
226 int instr = flags & FLAG_INSTR, res = 0, match, user;
227 int writeflag = flags & FLAG_WRITEFLAG? 1 : 0;
228 uint64_t msr;
229
230 reg_access_msr(cpu, &msr, 0, 0);
231 user = msr & PPC_MSR_PR? 1 : 0;
232
233 if (cpu->cd.ppc.bits == 32)
234 vaddr &= 0xffffffff;
235
236 if ((instr && !(msr & PPC_MSR_IR)) || (!instr && !(msr & PPC_MSR_DR))) {
237 *return_paddr = vaddr;
238 return 2;
239 }
240
241 if (cpu->cd.ppc.cpu_type.flags & PPC_601) {
242 fatal("ppc_translate_v2p(): TODO: 601\n");
243 exit(1);
244 }
245
246 /* Try the BATs first: */
247 if (cpu->cd.ppc.bits == 32) {
248 res = ppc_bat(cpu, vaddr, return_paddr, flags, user);
249 if (res > 0)
250 return res;
251 if (res == 0) {
252 fatal("[ TODO: BAT exception ]\n");
253 exit(1);
254 }
255 }
256
257 /* Virtual to physical translation: */
258 if (cpu->cd.ppc.bits == 32) {
259 match = ppc_vtp32(cpu, vaddr, return_paddr, &res, msr,
260 writeflag, instr);
261 if (match && res > 0)
262 return res;
263 } else {
264 /* htaborg = sdr1 & 0xfffffffffffc0000ULL; */
265 fatal("TODO: ppc 64-bit translation\n");
266 exit(1);
267 }
268
269
270 /*
271 * No match? Then cause an exception.
272 *
273 * PPC603: cause a software TLB reload exception.
274 * All others: cause a DSI or ISI.
275 */
276
277 if (flags & FLAG_NOEXCEPTIONS)
278 return 0;
279
280 if (!quiet_mode)
281 fatal("[ memory_ppc: exception! vaddr=0x%"PRIx64" pc=0x%"PRIx64
282 " instr=%i user=%i wf=%i ]\n", (uint64_t) vaddr,
283 (uint64_t) cpu->pc, instr, user, writeflag);
284
285 if (cpu->cd.ppc.cpu_type.flags & PPC_603) {
286 cpu->cd.ppc.spr[instr? SPR_IMISS : SPR_DMISS] = vaddr;
287
288 msr |= PPC_MSR_TGPR;
289 reg_access_msr(cpu, &msr, 1, 0);
290
291 ppc_exception(cpu, instr? 0x10 : (writeflag? 0x12 : 0x11));
292 } else {
293 if (!instr) {
294 cpu->cd.ppc.spr[SPR_DAR] = vaddr;
295 cpu->cd.ppc.spr[SPR_DSISR] = match?
296 DSISR_PROTECT : DSISR_NOTFOUND;
297 if (writeflag)
298 cpu->cd.ppc.spr[SPR_DSISR] |= DSISR_STORE;
299 }
300 ppc_exception(cpu, instr?
301 PPC_EXCEPTION_ISI : PPC_EXCEPTION_DSI);
302 }
303
304 return 0;
305 }
306
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