/[gxemul]/trunk/src/devices/dev_bt459.c
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Revision 24 - (hide annotations)
Mon Oct 8 16:19:56 2007 UTC (16 years, 7 months ago) by dpavlin
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++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1256 2006/06/23 20:43:44 debug Exp $
20060219	Various minor updates. Removing the old MIPS16 skeleton code,
		because it will need to be rewritten for dyntrans anyway.
20060220-22	Removing the non-working dyntrans backend support.
		Continuing on the 64-bit dyntrans virtual memory generalization.
20060223	More work on the 64-bit vm generalization.
20060225	Beginning on MIPS dyntrans load/store instructions.
		Minor PPC updates (64-bit load/store, etc).
		Fixes for the variable-instruction-length framework, some
		minor AVR updates (a simple Hello World program works!).
		Beginning on a skeleton for automatically generating documen-
		tation (for devices etc.).
20060226	PPC updates (adding some more 64-bit instructions, etc).
		AVR updates (more instructions).
		FINALLY found and fixed the zs bug, making NetBSD/macppc
		accept the serial console.
20060301	Adding more AVR instructions.
20060304	Continuing on AVR-related stuff. Beginning on a framework for
		cycle-accurate device emulation. Adding an experimental "PAL
		TV" device (just a dummy so far).
20060305	Adding more AVR instructions.
		Adding a dummy epcom serial controller (for TS7200 emulation).
20060310	Removing the emul() command from configuration files, so only
		net() and machine() are supported.
		Minor progress on the MIPS dyntrans rewrite.
20060311	Continuing on the MIPS dyntrans rewrite (adding more
		instructions, etc).
20060315	Adding more instructions (sllv, srav, srlv, bgtz[l], blez[l],
		beql, bnel, slti[u], various loads and stores).
20060316	Removing the ALWAYS_SIGNEXTEND_32 option, since it was rarely
		used.
		Adding more MIPS dyntrans instructions, and fixing bugs.
20060318	Implementing fast loads/stores for MIPS dyntrans (big/little
		endian, 32-bit and 64-bit modes).
20060320	Making MIPS dyntrans the default configure option; use
		"--enable-oldmips" to use the old bintrans system.
		Adding MIPS dyntrans dmult[u]; minor updates.
20060322	Continuing... adding some more instructions.
		Adding a simple skeleton for demangling C++ "_ZN" symbols.
20060323	Moving src/debugger.c into a new directory (src/debugger/).
20060324	Fixing the hack used to load PPC ELFs (useful for relocated
		Linux/ppc kernels), and adding a dummy G3 machine mode.
20060325-26	Beginning to experiment with GDB remote serial protocol
		connections; adding a -G command line option for selecting
		which TCP port to listen to.
20060330	Beginning a major cleanup to replace things like "0x%016llx"
		with more correct "0x%016"PRIx64, etc.
		Continuing on the GDB remote serial protocol support.
20060331	More cleanup, and some minor GDB remote progress.
20060402	Adding a hack to the configure script, to allow compilation
		on systems that lack PRIx64 etc.
20060406	Removing the temporary FreeBSD/arm hack in dev_ns16550.c and
		replacing it with a better fix from Olivier Houchard.
20060407	A remote debugger (gdb or ddd) can now start and stop the
		emulator using the GDB remote serial protocol, and registers
		and memory can be read. MIPS only for now.
20060408	More GDB progress: single-stepping also works, and also adding
		support for ARM, PowerPC, and Alpha targets.
		Continuing on the delay-slot-across-page-boundary issue.
20060412	Minor update: beginning to add support for the SPARC target
		to the remote GDB functionality.
20060414	Various MIPS updates: adding more instructions for dyntrans
		(eret, add), and making some exceptions work. Fixing a bug
		in dmult[u].
		Implementing the first SPARC instructions (sethi, or).
20060415	Adding "magic trap" instructions so that PROM calls can be
		software emulated in MIPS dyntrans.
		Adding more MIPS dyntrans instructions (ddiv, dadd) and
		fixing another bug in dmult.
20060416	More MIPS dyntrans progress: adding [d]addi, movn, movz, dsllv,
		rfi, an ugly hack for supporting R2000/R3000 style faked caches,
		preliminary interrupt support, and various other updates and
		bugfixes.
20060417	Adding more SPARC instructions (add, sub, sll[x], sra[x],
		srl[x]), and useful SPARC header definitions.
		Adding the first (trivial) x86/AMD64 dyntrans instructions (nop,
		cli/sti, stc/clc, std/cld, simple mov, inc ax). Various other
		x86 updates related to variable instruction length stuff.
		Adding unaligned loads/stores to the MIPS dyntrans mode (but
		still using the pre-dyntrans (slow) imlementation).
20060419	Fixing a MIPS dyntrans exception-in-delay-slot bug.
		Removing the old "show opcode statistics" functionality, since
		it wasn't really useful and isn't implemented for dyntrans.
		Single-stepping (or running with instruction trace) now looks
		ok with dyntrans with delay-slot architectures.
20060420	Minor hacks (removing the -B command line option when compiled
		for non-bintrans, and some other very minor updates).
		Adding (slow) MIPS dyntrans load-linked/store-conditional.
20060422	Applying fixes for bugs discovered by Nils Weller's nwcc
		(static DEC memmap => now per machine, and adding an extern
		keyword in cpu_arm_instr.c).
		Finally found one of the MIPS dyntrans bugs that I've been
		looking for (copy/paste spelling error BIG vs LITTLE endian in
		cpu_mips_instr_loadstore.c for 16-bit fast stores).
		FINALLY found the major MIPS dyntrans bug: slti vs sltiu
		signed/unsigned code in cpu_mips_instr.c. :-)
		Adding more MIPS dyntrans instructions (lwc1, swc1, bgezal[l],
		ctc1, tlt[u], tge[u], tne, beginning on rdhwr).
		NetBSD/hpcmips can now reach userland when using dyntrans :-)
		Adding some more x86 dyntrans instructions.
		Finally removed the old Alpha-specific virtual memory code,
		and replaced it with the generic 64-bit version.
		Beginning to add disassembly support for SPECIAL3 MIPS opcodes.
20060423	Continuing on the delay-slot-across-page-boundary issue;
		adding an end_of_page2 ic slot (like I had planned before, but
		had removed for some reason).
		Adding a quick-and-dirty fallback to legacy coprocessor 1
		code (i.e. skipping dyntrans implementation for now).
		NetBSD/hpcmips and NetBSD/pmax (when running on an emulated
		R4400) can now be installed and run. :-)  (Many bugs left
		to fix, though.)
		Adding more MIPS dyntrans instructions: madd[u], msub[u].
		Cleaning up the SPECIAL2 vs R5900/TX79/C790 "MMI" opcode
		maps somewhat (disassembly and dyntrans instruction decoding).
20060424	Adding an isa_revision field to mips_cpu_types.h, and making
		sure that SPECIAL3 opcodes cause Reserved Instruction
		exceptions on MIPS32/64 revisions lower than 2.
		Adding the SPARC 'ba', 'call', 'jmpl/retl', 'and', and 'xor'
		instructions.
20060425	Removing the -m command line option ("run at most x 
		instructions") and -T ("single_step_on_bad_addr"), because
		they never worked correctly with dyntrans anyway.
		Freshening up the man page.
20060428	Adding more MIPS dyntrans instructions: bltzal[l], idle.
		Enabling MIPS dyntrans compare interrupts.
20060429	FINALLY found the weird dyntrans bug, causing NetBSD etc. to
		behave strangely: some floating point code (conditional
		coprocessor branches) could not be reused from the old
		non-dyntrans code. The "quick-and-dirty fallback" only appeared
		to work. Fixing by implementing bc1* for MIPS dyntrans.
		More MIPS instructions: [d]sub, sdc1, ldc1, dmtc1, dmfc1, cfc0.
		Freshening up MIPS floating point disassembly appearance.
20060430	Continuing on C790/R5900/TX79 disassembly; implementing 128-bit
		"por" and "pextlw".
20060504	Disabling -u (userland emulation) unless compiled as unstable
		development version.
		Beginning on freshening up the testmachine include files,
		to make it easier to reuse those files (placing them in
		src/include/testmachine/), and beginning on a set of "demos"
		or "tutorials" for the testmachine functionality.
		Minor updates to the MIPS GDB remote protocol stub.
		Refreshing doc/experiments.html and gdb_remote.html.
		Enabling Alpha emulation in the stable release configuration,
		even though no guest OSes for Alpha can run yet.
20060505	Adding a generic 'settings' object, which will contain
		references to settable variables (which will later be possible
		to access using the debugger).
20060506	Updating dev_disk and corresponding demo/documentation (and
		switching from SCSI to IDE disk types, so it actually works
		with current test machines :-).
20060510	Adding a -D_LARGEFILE_SOURCE hack for 64-bit Linux hosts,
		so that fseeko() doesn't give a warning.
		Updating the section about how dyntrans works (the "runnable
		IR") in doc/intro.html.
		Instruction updates (some x64=1 checks, some more R5900
		dyntrans stuff: better mul/mult separation from MIPS32/64,
		adding ei and di).
		Updating MIPS cpuregs.h to a newer one (from NetBSD).
		Adding more MIPS dyntrans instructions: deret, ehb.
20060514	Adding disassembly and beginning implementation of SPARC wr
		and wrpr instructions.
20060515	Adding a SUN SPARC machine mode, with dummy SS20 and Ultra1
		machines. Adding the 32-bit "rd psr" instruction.
20060517	Disassembly support for the general SPARC rd instruction.
		Partial implementation of the cmp (subcc) instruction.
		Some other minor updates (making sure that R5900 processors
		start up with the EIE bit enabled, otherwise Linux/playstation2
		receives no interrupts).
20060519	Minor MIPS updates/cleanups.
20060521	Moving the MeshCube machine into evbmips; this seems to work
		reasonably well with a snapshot of a NetBSD MeshCube kernel.
		Cleanup/fix of MIPS config0 register initialization.
20060529	Minor MIPS fixes, including a sign-extension fix to the
		unaligned load/store code, which makes NetBSD/pmax on R3000
		work better with dyntrans. (Ultrix and Linux/DECstation still
		don't work, though.)
20060530	Minor updates to the Alpha machine mode: adding an AlphaBook
		mode, an LCA bus (forwarding accesses to an ISA bus), etc.
20060531	Applying a bugfix for the MIPS dyntrans sc[d] instruction from
		Ondrej Palkovsky. (Many thanks.)
20060601	Minifix to allow ARM immediate msr instruction to not give
		an error for some valid values.
		More Alpha updates.
20060602	Some minor Alpha updates.
20060603	Adding the Alpha cmpbge instruction. NetBSD/alpha prints its
		first boot messages :-) on an emulated Alphabook 1.
20060612	Minor updates; adding a dev_ether.h include file for the
		testmachine ether device. Continuing the hunt for the dyntrans
		bug which makes Linux and Ultrix on DECstation behave
		strangely... FINALLY found it! It seems to be related to
		invalidation of the translation cache, on tlbw{r,i}. There
		also seems to be some remaining interrupt-related problems.
20060614	Correcting the implementation of ldc1/sdc1 for MIPS dyntrans
		(so that it uses 16 32-bit registers if the FR bit in the
		status register is not set).
20060616	REMOVING BINTRANS COMPLETELY!
		Removing the old MIPS interpretation mode.
		Removing the MFHILO_DELAY and instruction delay stuff, because
		they wouldn't work with dyntrans anyway.
20060617	Some documentation updates (adding "NetBSD-archive" to some
		URLs, and new Debian/DECstation installation screenshots).
		Removing the "tracenull" and "enable-caches" configure options.
		Improving MIPS dyntrans performance somewhat (only invalidate
		translations if necessary, on writes to the entryhi register,
		instead of doing it for all cop0 writes).
20060618	More cleanup after the removal of the old MIPS emulation.
		Trying to fix the MIPS dyntrans performance bugs/bottlenecks;
		only semi-successful so far (for R3000).
20060620	Minor update to allow clean compilation again on Tru64/Alpha.
20060622	MIPS cleanup and fixes (removing the pc_last stuff, which
		doesn't make sense with dyntrans anyway, and fixing a cross-
		page-delay-slot-with-exception case in end_of_page).
		Removing the old max_random_cycles_per_chunk stuff, and the
		concept of cycles vs instructions for MIPS emulation.
		FINALLY found and fixed the bug which caused NetBSD/pmax
		clocks to behave strangely (it was a load to the zero register,
		which was treated as a NOP; now it is treated as a load to a
		dummy scratch register).
20060623	Increasing the dyntrans chunk size back to
		N_SAFE_DYNTRANS_LIMIT, instead of N_SAFE_DYNTRANS_LIMIT/2.
		Preparing for a quick release, even though there are known
		bugs, and performance for non-R3000 MIPS emulation is very
		poor. :-/
		Reverting to half the dyntrans chunk size again, because
		NetBSD/cats seemed less stable with full size chunks. :(
		NetBSD/sgimips 3.0 can now run :-)  (With release 0.3.8, only
		NetBSD/sgimips 2.1 worked, not 3.0.)

==============  RELEASE 0.4.0  ==============
1 dpavlin 4 /*
2 dpavlin 22 * Copyright (C) 2003-2006 Anders Gavare. All rights reserved.
3 dpavlin 4 *
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 24 * $Id: dev_bt459.c,v 1.64 2006/03/04 12:38:47 debug Exp $
29 dpavlin 4 *
30     * Brooktree 459 vdac, used by TURBOchannel graphics cards.
31     */
32    
33     #include <stdio.h>
34     #include <stdlib.h>
35     #include <string.h>
36    
37     #include "cpu.h"
38     #include "devices.h"
39     #include "machine.h"
40     #include "memory.h"
41     #include "misc.h"
42     #include "x11.h"
43    
44     #include "bt459.h"
45    
46    
47     #ifdef WITH_X11
48     #include <X11/Xlib.h>
49     #include <X11/Xutil.h>
50     #endif
51    
52     extern int quiet_mode;
53    
54    
55     /* #define BT459_DEBUG */
56     /* #define WITH_CURSOR_DEBUG */
57     #define BT459_TICK_SHIFT 14
58    
59     struct bt459_data {
60     uint32_t bt459_reg[DEV_BT459_NREGS];
61    
62     unsigned char cur_addr_hi;
63     unsigned char cur_addr_lo;
64    
65     int planes;
66     int type;
67    
68     int irq_nr;
69     int interrupts_enable;
70     int interrupt_time;
71     int interrupt_time_reset_value;
72    
73     int cursor_x_add;
74     int cursor_y_add;
75    
76     int need_to_redraw_whole_screen;
77    
78     int need_to_update_cursor_shape;
79     int cursor_on;
80     int cursor_x;
81     int cursor_y;
82     int cursor_xsize;
83     int cursor_ysize;
84    
85     int palette_sub_offset; /* 0, 1, or 2 */
86    
87     struct vfb_data *vfb_data;
88    
89     /*
90     * There is one pointer to the framebuffer's RGB palette,
91     * and then a local copy of the palette. 256 * 3 bytes (r,g,b).
92     * The reason for this is that when we need to blank the screen
93     * (ie video_on = 0), we can set the framebuffer's palette to all
94     * zeroes, but keep our own copy intact, to be reused later again
95     * when the screen is unblanked.
96     */
97     int video_on;
98     unsigned char *rgb_palette; /* 256 * 3 (r,g,b) */
99     unsigned char local_rgb_palette[256 * 3];
100     };
101    
102    
103     /*
104     * bt459_update_X_cursor():
105     *
106     * This routine takes the color values in the cursor RAM area, and put them
107     * in the framebuffer window's cursor_pixels.
108     *
109     * d->cursor_xsize and ysize are also updated.
110     */
111     static void bt459_update_X_cursor(struct cpu *cpu, struct bt459_data *d)
112     {
113     int i, x,y, xmax=0, ymax=0;
114     int bw_only = 1;
115    
116     /* First, let's calculate the size of the cursor: */
117     for (y=0; y<64; y++)
118     for (x=0; x<64; x+=4) {
119     int reg = BT459_REG_CRAM_BASE + y*16 + x/4;
120     unsigned char data = d->bt459_reg[reg];
121    
122     if (data)
123     ymax = y;
124    
125     for (i=0; i<4; i++) {
126     int color = (data >> (6-2*i)) & 3;
127     if (color != 0)
128     xmax = x + i;
129     if (color != 0 && color != 3)
130     bw_only = 0;
131     }
132     }
133    
134     d->cursor_xsize = xmax + 1;
135     d->cursor_ysize = ymax + 1;
136    
137     /*
138     * The 'bw_only' hack is because it is nicer to have the b/w
139     * text cursor invert whatever it is standing on, not just overwrite
140     * it with a big white box.
141     *
142     * The following seems to work with NetBSD/OpenBSD/Ultrix/Sprite:
143     * 0 = transparent, 1 and 2 = use the color specified by
144     * BT459_REG_CCOLOR_2, 3 = reverse of color 1/2.
145     */
146    
147     #ifdef WITH_X11
148     if (cpu->machine->use_x11 && d->vfb_data->fb_window != NULL) {
149     for (y=0; y<=ymax; y++) {
150     for (x=0; x<=xmax; x+=4) {
151     struct fb_window *win = d->vfb_data->fb_window;
152     int reg = BT459_REG_CRAM_BASE + y*16 + x/4;
153     unsigned char data = d->bt459_reg[reg];
154    
155     for (i=0; i<4; i++) {
156     int color = (data >> (6-2*i)) & 3;
157     int pixelvalue;
158    
159     if (bw_only) {
160     if (color)
161     pixelvalue =
162     CURSOR_COLOR_INVERT;
163     else
164     pixelvalue = 0;
165     } else {
166     pixelvalue =
167     CURSOR_COLOR_TRANSPARENT;
168     switch (color) {
169     case 1:
170     case 2: pixelvalue = (d->
171     bt459_reg[
172     BT459_REG_CCOLOR_2]
173     >> 4) & 0xf;
174     break;
175     case 3: pixelvalue = 15 -
176     ((d->bt459_reg[
177     BT459_REG_CCOLOR_2]
178     >> 4) & 0xf);
179     break;
180     }
181     }
182    
183     win->cursor_pixels[y][x+i] =
184     pixelvalue;
185     #ifdef WITH_CURSOR_DEBUG
186     printf("%i", color);
187     #endif
188     }
189     }
190     #ifdef WITH_CURSOR_DEBUG
191     printf("\n");
192     #endif
193     }
194     #ifdef WITH_CURSOR_DEBUG
195     printf("color 1,2,3 = 0x%02x, 0x%02x, 0x%02x\n",
196     d->bt459_reg[BT459_REG_CCOLOR_1],
197     d->bt459_reg[BT459_REG_CCOLOR_2],
198     d->bt459_reg[BT459_REG_CCOLOR_3]);
199     printf("\n");
200     #endif
201     /*
202     * Make sure the cursor is redrawn, if it is on:
203     *
204     * How does this work? Well, 0 is off, and non-zero is on,
205     * but if the old and new differ, the cursor is redrawn.
206     * (Hopefully this will "never" overflow.)
207     */
208     if (d->cursor_on)
209     d->cursor_on ++;
210     }
211     #endif
212     }
213    
214    
215     /*
216     * bt459_update_cursor_position():
217     */
218     static void bt459_update_cursor_position(struct bt459_data *d,
219     int old_cursor_on)
220     {
221     int new_cursor_x = (d->bt459_reg[BT459_REG_CXLO] & 255) +
222     ((d->bt459_reg[BT459_REG_CXHI] & 255) << 8) - d->cursor_x_add;
223     int new_cursor_y = (d->bt459_reg[BT459_REG_CYLO] & 255) +
224     ((d->bt459_reg[BT459_REG_CYHI] & 255) << 8) - d->cursor_y_add;
225    
226     if (new_cursor_x != d->cursor_x || new_cursor_y != d->cursor_y ||
227     d->cursor_on != old_cursor_on) {
228     int on;
229    
230     d->cursor_x = new_cursor_x;
231     d->cursor_y = new_cursor_y;
232    
233     if (!quiet_mode)
234     debug("[ bt459: cursor = %03i,%03i ]\n",
235     d->cursor_x, d->cursor_y);
236    
237     on = d->cursor_on;
238     if (d->cursor_xsize == 0 || d->cursor_ysize == 0)
239     on = 0;
240    
241     dev_fb_setcursor(d->vfb_data, d->cursor_x, d->cursor_y,
242     on, d->cursor_xsize, d->cursor_ysize);
243     }
244     }
245    
246    
247     /*
248     * dev_bt459_tick():
249     */
250     void dev_bt459_tick(struct cpu *cpu, void *extra)
251     {
252     struct bt459_data *d = extra;
253     int old_cursor_on = d->cursor_on;
254    
255     if (d->need_to_update_cursor_shape) {
256     d->need_to_update_cursor_shape = 0;
257     bt459_update_X_cursor(cpu, d);
258     bt459_update_cursor_position(d, old_cursor_on);
259     }
260    
261     if (d->need_to_redraw_whole_screen) {
262     d->vfb_data->update_x1 = 0;
263     d->vfb_data->update_x2 = d->vfb_data->xsize - 1;
264     d->vfb_data->update_y1 = 0;
265     d->vfb_data->update_y2 = d->vfb_data->ysize - 1;
266     d->need_to_redraw_whole_screen = 0;
267     }
268    
269     /*
270     * Vertical retrace interrupts. (This hack is kind of ugly.)
271     * Once every 'interrupt_time_reset_value', the interrupt is
272     * asserted. It is acked either manually (by someone reading
273     * a normal BT459 register or the Interrupt ack register),
274     * or after another tick has passed. (This is to prevent
275     * lockups from unhandled interrupts.)
276     */
277     if (d->type != BT459_PX && d->interrupts_enable && d->irq_nr > 0) {
278     d->interrupt_time --;
279     if (d->interrupt_time < 0) {
280     d->interrupt_time = d->interrupt_time_reset_value;
281     cpu_interrupt(cpu, d->irq_nr);
282     } else
283     cpu_interrupt_ack(cpu, d->irq_nr);
284     }
285     }
286    
287    
288     /*
289     * dev_bt459_irq_access():
290     */
291 dpavlin 22 DEVICE_ACCESS(bt459_irq)
292 dpavlin 4 {
293     struct bt459_data *d = (struct bt459_data *) extra;
294     uint64_t idata = 0, odata = 0;
295    
296 dpavlin 18 if (writeflag == MEM_WRITE)
297     idata = memory_readmax64(cpu, data, len);
298 dpavlin 4
299     #ifdef BT459_DEBUG
300     fatal("[ bt459: IRQ ack ]\n");
301     #endif
302    
303     d->interrupts_enable = 1;
304     if (d->irq_nr > 0)
305     cpu_interrupt_ack(cpu, d->irq_nr);
306    
307     if (writeflag == MEM_READ)
308     memory_writemax64(cpu, data, len, odata);
309    
310     return 1;
311     }
312    
313    
314     /*
315     * dev_bt459_access():
316     */
317 dpavlin 22 DEVICE_ACCESS(bt459)
318 dpavlin 4 {
319     struct bt459_data *d = (struct bt459_data *) extra;
320     uint64_t idata = 0, odata = 0;
321     int btaddr, old_cursor_on = d->cursor_on, modified;
322    
323     idata = memory_readmax64(cpu, data, len);
324    
325     #ifdef BT459_DEBUG
326     if (writeflag == MEM_WRITE)
327     fatal("[ bt459: write to addr 0x%02x: %08x ]\n",
328     (int)relative_addr, (int)idata);
329     #endif
330    
331     /*
332     * Vertical retrace interrupts are acked either by
333     * accessing a normal BT459 register, or the irq register,
334     * or by simply "missing" it.
335     */
336     if (d->irq_nr > 0)
337     cpu_interrupt_ack(cpu, d->irq_nr);
338    
339     /* ID register is read-only, should always be 0x4a or 0x4a4a4a: */
340     if (d->planes == 24)
341     d->bt459_reg[BT459_REG_ID] = 0x4a4a4a;
342     else {
343     /*
344     * TODO: Is it really 0x4a, or 0x4a0000?
345     * Ultrix panics with a "bad VDAC ID" message if 0x4a
346     * is returned.
347     */
348     d->bt459_reg[BT459_REG_ID] = 0x4a0000;
349     }
350    
351     btaddr = ((d->cur_addr_hi << 8) + d->cur_addr_lo) % DEV_BT459_NREGS;
352    
353     /* Read from/write to the bt459: */
354     switch (relative_addr) {
355     case 0x00: /* Low byte of address: */
356     if (writeflag == MEM_WRITE) {
357     if (!quiet_mode)
358     debug("[ bt459: write to Low Address Byte, "
359     "0x%02x ]\n", (int)idata);
360     d->cur_addr_lo = idata;
361     d->palette_sub_offset = 0;
362     } else {
363     odata = d->cur_addr_lo;
364     if (!quiet_mode)
365     debug("[ bt459: read from Low Address Byte: "
366     "0x%0x ]\n", (int)odata);
367     }
368     break;
369     case 0x04: /* High byte of address: */
370     if (writeflag == MEM_WRITE) {
371     if (!quiet_mode)
372     debug("[ bt459: write to High Address Byte, "
373     "0x%02x ]\n", (int)idata);
374     d->cur_addr_hi = idata;
375     d->palette_sub_offset = 0;
376     } else {
377     odata = d->cur_addr_hi;
378     if (!quiet_mode)
379     debug("[ bt459: read from High Address Byte: "
380     "0x%0x ]\n", (int)odata);
381     }
382     break;
383     case 0x08: /* Register access: */
384     if (writeflag == MEM_WRITE) {
385     if (!quiet_mode)
386     debug("[ bt459: write to BT459 register "
387     "0x%04x, value 0x%02x ]\n", btaddr,
388     (int)idata);
389     modified = (d->bt459_reg[btaddr] != idata);
390     d->bt459_reg[btaddr] = idata;
391    
392     switch (btaddr) {
393     case BT459_REG_CCOLOR_1:
394     case BT459_REG_CCOLOR_2:
395     case BT459_REG_CCOLOR_3:
396     if (modified)
397     d->need_to_update_cursor_shape = 1;
398     break;
399     case BT459_REG_PRM:
400     /*
401     * NetBSD writes 0x00 to this register to
402     * blank the screen (video off), and 0xff
403     * to turn the screen on.
404     */
405     switch (idata & 0xff) {
406     case 0: d->video_on = 0;
407     memset(d->rgb_palette, 0, 256*3);
408     d->need_to_redraw_whole_screen = 1;
409     debug("[ bt459: video OFF ]\n");
410     break;
411     default:d->video_on = 1;
412     memcpy(d->rgb_palette,
413     d->local_rgb_palette, 256*3);
414     d->need_to_redraw_whole_screen = 1;
415     debug("[ bt459: video ON ]\n");
416     }
417     break;
418     case BT459_REG_CCR:
419     /* Cursor control register: */
420     switch (idata & 0xff) {
421     case 0x00: d->cursor_on = 0; break;
422     case 0xc0:
423     case 0xc1: d->cursor_on = 1; break;
424     default:
425     fatal("[ bt459: unimplemented CCR "
426     "value 0x%08x ]\n", (int)idata);
427     }
428     if (modified)
429     d->need_to_update_cursor_shape = 1;
430     break;
431     default:
432     if (btaddr < 0x100)
433     fatal("[ bt459: write to BT459 "
434     "register 0x%04x, value 0x%02x ]\n",
435     btaddr, (int)idata);
436     }
437    
438     /* Write to cursor bitmap: */
439     if (btaddr >= BT459_REG_CRAM_BASE && modified)
440     d->need_to_update_cursor_shape = 1;
441     } else {
442     odata = d->bt459_reg[btaddr];
443    
444     /* Perhaps this hack is not necessary: */
445     if (btaddr == BT459_REG_ID && len==1)
446     odata = (odata >> 16) & 255;
447    
448     if (!quiet_mode)
449     debug("[ bt459: read from BT459 register "
450     "0x%04x, value 0x%02x ]\n", btaddr,
451     (int)odata);
452     }
453    
454     /* Go to next register: */
455     d->cur_addr_lo ++;
456     if (d->cur_addr_lo == 0)
457     d->cur_addr_hi ++;
458     break;
459     case 0xc: /* Color map: */
460     if (writeflag == MEM_WRITE) {
461     idata &= 255;
462     if (!quiet_mode)
463     debug("[ bt459: write to BT459 colormap "
464     "0x%04x subaddr %i, value 0x%02x ]\n",
465     btaddr, d->palette_sub_offset, (int)idata);
466    
467     if (btaddr < 0x100) {
468     if (d->video_on &&
469     d->local_rgb_palette[(btaddr & 0xff) * 3
470     + d->palette_sub_offset] != idata)
471     d->need_to_redraw_whole_screen = 1;
472    
473     /*
474     * Actually, the palette should only be
475     * updated after the third write,
476     * but this should probably work fine too:
477     */
478     d->local_rgb_palette[(btaddr & 0xff) * 3
479     + d->palette_sub_offset] = idata;
480    
481     if (d->video_on)
482     d->rgb_palette[(btaddr & 0xff) * 3
483     + d->palette_sub_offset] = idata;
484     }
485     } else {
486     if (btaddr < 0x100)
487     odata = d->local_rgb_palette[(btaddr & 0xff)
488     * 3 + d->palette_sub_offset];
489     if (!quiet_mode)
490     debug("[ bt459: read from BT459 colormap "
491     "0x%04x subaddr %i, value 0x%02x ]\n",
492     btaddr, d->palette_sub_offset, (int)odata);
493     }
494    
495     d->palette_sub_offset ++;
496     if (d->palette_sub_offset >= 3) {
497     d->palette_sub_offset = 0;
498    
499     d->cur_addr_lo ++;
500     if (d->cur_addr_lo == 0)
501     d->cur_addr_hi ++;
502     }
503    
504     break;
505     default:
506     if (writeflag == MEM_WRITE) {
507     debug("[ bt459: unimplemented write to address 0x%x, "
508     "data=0x%02x ]\n", (int)relative_addr, (int)idata);
509     } else {
510     debug("[ bt459: unimplemented read from address "
511     "0x%x ]\n", (int)relative_addr);
512     }
513     }
514    
515    
516     bt459_update_cursor_position(d, old_cursor_on);
517    
518     if (writeflag == MEM_READ)
519     memory_writemax64(cpu, data, len, odata);
520    
521     #ifdef BT459_DEBUG
522     if (writeflag == MEM_READ)
523     fatal("[ bt459: read from addr 0x%02x: %08x ]\n",
524     (int)relative_addr, (int)idata);
525     #endif
526    
527     return 1;
528     }
529    
530    
531     /*
532     * dev_bt459_init():
533     */
534     void dev_bt459_init(struct machine *machine, struct memory *mem,
535     uint64_t baseaddr, uint64_t baseaddr_irq, struct vfb_data *vfb_data,
536     int planes, int irq_nr, int type)
537     {
538     struct bt459_data *d = malloc(sizeof(struct bt459_data));
539     if (d == NULL) {
540     fprintf(stderr, "out of memory\n");
541     exit(1);
542     }
543    
544     memset(d, 0, sizeof(struct bt459_data));
545    
546     d->vfb_data = vfb_data;
547     d->rgb_palette = vfb_data->rgb_palette;
548     d->planes = planes;
549     d->irq_nr = irq_nr;
550     d->type = type;
551     d->cursor_x = -1;
552     d->cursor_y = -1;
553     d->cursor_xsize = d->cursor_ysize = 0; /* anything */
554     d->video_on = 1;
555    
556     /*
557     * These offsets are based on those mentioned in NetBSD,
558     * and then adjusted to look good with both NetBSD and
559     * Ultrix:
560     */
561     switch (d->type) {
562     case BT459_PX:
563     d->cursor_x_add = 370;
564     d->cursor_y_add = 37;
565     break;
566     case BT459_BA:
567     d->cursor_x_add = 220;
568     d->cursor_y_add = 35;
569     break;
570     case BT459_BBA:
571     if (vfb_data->xsize == 1280) {
572     /* 1280x1024: */
573     d->cursor_x_add = 368;
574     d->cursor_y_add = 38;
575     } else {
576     /* 1024x864: */
577     d->cursor_x_add = 220;
578     d->cursor_y_add = 35;
579     }
580     break;
581     }
582    
583     d->interrupt_time_reset_value = 500;
584    
585     memory_device_register(mem, "bt459", baseaddr, DEV_BT459_LENGTH,
586 dpavlin 20 dev_bt459_access, (void *)d, DM_DEFAULT, NULL);
587 dpavlin 4
588     if (baseaddr_irq != 0)
589     memory_device_register(mem, "bt459_irq", baseaddr_irq, 0x10000,
590 dpavlin 20 dev_bt459_irq_access, (void *)d, DM_DEFAULT, NULL);
591 dpavlin 4
592 dpavlin 24 machine_add_tickfunction(machine, dev_bt459_tick, d,
593     BT459_TICK_SHIFT, 0.0);
594 dpavlin 4 }
595    
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