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/* |
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* Copyright (C) 2003-2005 Anders Gavare. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* |
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* $Id: dev_mc146818.c,v 1.80 2005/11/20 11:28:45 debug Exp $ |
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* |
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* MC146818 real-time clock, used by many different machines types. |
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* (DS1687 as used in some other machines is also similar to the MC146818.) |
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* |
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* This device contains Date/time, the machine's ethernet address (on |
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* DECstation 3100), and can cause periodic (hardware) interrupts. |
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* |
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* NOTE: Many register offsets are multiplied by 4 in this code; this is |
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* because I originally wrote it for DECstation 3100 emulation, where the |
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* registered are spaced that way. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <time.h> |
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|
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#include "cpu.h" |
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#include "devices.h" |
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#include "machine.h" |
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#include "memory.h" |
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#include "misc.h" |
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|
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#include "mc146818reg.h" |
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|
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|
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#define to_bcd(x) ( ((x)/10) * 16 + ((x)%10) ) |
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#define from_bcd(x) ( ((x)>>4) * 10 + ((x)&15) ) |
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|
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/* #define MC146818_DEBUG */ |
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|
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#define TICK_SHIFT 14 |
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|
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|
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/* 256 on DECstation, SGI uses reg at 72*4 as the Century */ |
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#define N_REGISTERS 1024 |
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struct mc_data { |
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int access_style; |
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int last_addr; |
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|
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int register_choice; |
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int reg[N_REGISTERS]; |
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int addrdiv; |
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|
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int use_bcd; |
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|
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int timebase_hz; |
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int interrupt_hz; |
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int irq_nr; |
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|
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int previous_second; |
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int n_seconds_elapsed; |
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int uip_threshold; |
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|
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int interrupt_every_x_cycles; |
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int cycles_left_until_interrupt; |
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|
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int ugly_netbsd_prep_hack_done; |
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int ugly_netbsd_prep_hack_sec; |
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}; |
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|
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|
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/* |
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* Ugly hack to fool NetBSD/prep to accept the clock. (See mcclock_isa_match |
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* in NetBSD's arch/prep/isa/mcclock_isa.c for details.) |
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*/ |
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#define NETBSD_HACK_INIT 0 |
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#define NETBSD_HACK_FIRST_1 1 |
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#define NETBSD_HACK_FIRST_2 2 |
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#define NETBSD_HACK_SECOND_1 3 |
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#define NETBSD_HACK_SECOND_2 4 |
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#define NETBSD_HACK_DONE 5 |
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|
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|
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/* |
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* recalc_interrupt_cycle(): |
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* |
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* If automatic_clock_adjustment is turned on, then emulated_hz is modified |
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* dynamically. We have to recalculate how often interrupts are to be |
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* triggered. |
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*/ |
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static void recalc_interrupt_cycle(struct cpu *cpu, struct mc_data *d) |
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{ |
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int64_t emulated_hz = cpu->machine->emulated_hz; |
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#if 0 |
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static int warning_printed = 0; |
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|
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/* |
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* A hack to make Ultrix run, even on very fast host machines. |
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* |
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* (Ultrix was probably never meant to be run on machines with |
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* faster CPUs than around 33 MHz or so.) |
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*/ |
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if (d->access_style == MC146818_DEC && emulated_hz > 30000000) { |
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if (!warning_printed) { |
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fatal("\n*********************************************" |
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"**********************************\n\n Your hos" |
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"t machine is too fast! The emulated CPU speed wil" |
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"l be limited to\n 30 MHz, and clocks inside the" |
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" emulated environment might go faster than\n in" |
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" the real world. You have been warned.\n\n******" |
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"*************************************************" |
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"************************\n\n"); |
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warning_printed = 1; |
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} |
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|
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emulated_hz = 30000000; |
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} |
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#endif |
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|
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if (d->interrupt_hz > 0) |
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d->interrupt_every_x_cycles = |
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emulated_hz / d->interrupt_hz; |
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else |
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d->interrupt_every_x_cycles = 0; |
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} |
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|
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|
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/* |
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* dev_mc146818_tick(): |
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*/ |
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void dev_mc146818_tick(struct cpu *cpu, void *extra) |
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{ |
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struct mc_data *d = extra; |
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|
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recalc_interrupt_cycle(cpu, d); |
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|
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if ((d->reg[MC_REGB * 4] & MC_REGB_PIE) && |
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d->interrupt_every_x_cycles > 0) { |
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d->cycles_left_until_interrupt -= (1 << TICK_SHIFT); |
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|
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if (d->cycles_left_until_interrupt < 0 || |
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d->cycles_left_until_interrupt >= |
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d->interrupt_every_x_cycles) { |
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/* debug("[ rtc interrupt (every %i cycles) ]\n", |
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d->interrupt_every_x_cycles); */ |
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cpu_interrupt(cpu, d->irq_nr); |
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|
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d->reg[MC_REGC * 4] |= MC_REGC_PF; |
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|
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/* Reset the cycle countdown: */ |
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while (d->cycles_left_until_interrupt < 0) |
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d->cycles_left_until_interrupt += |
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d->interrupt_every_x_cycles; |
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} |
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} |
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|
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if (d->reg[MC_REGC * 4] & MC_REGC_UF || |
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d->reg[MC_REGC * 4] & MC_REGC_AF || |
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d->reg[MC_REGC * 4] & MC_REGC_PF) |
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d->reg[MC_REGC * 4] |= MC_REGC_IRQF; |
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} |
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|
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|
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/* |
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* dev_mc146818_jazz_access(): |
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* |
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* It seems like JAZZ machines accesses the mc146818 by writing one byte to |
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* 0x90000070 and then reading or writing another byte at 0x......0004000. |
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*/ |
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int dev_mc146818_jazz_access(struct cpu *cpu, struct memory *mem, |
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uint64_t relative_addr, unsigned char *data, size_t len, |
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int writeflag, void *extra) |
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{ |
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struct mc_data *d = extra; |
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|
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#ifdef MC146818_DEBUG |
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if (writeflag == MEM_WRITE) { |
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int i; |
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fatal("[ mc146818_jazz: write to addr=0x%04x: ", |
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(int)relative_addr); |
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for (i=0; i<len; i++) |
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fatal("%02x ", data[i]); |
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fatal("]\n"); |
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} else |
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fatal("[ mc146818_jazz: read from addr=0x%04x ]\n", |
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(int)relative_addr); |
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#endif |
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|
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if (writeflag == MEM_WRITE) { |
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d->last_addr = data[0]; |
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return 1; |
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} else { |
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data[0] = d->last_addr; |
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return 1; |
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} |
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} |
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|
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|
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/* |
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* mc146818_update_time(): |
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* |
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* This function updates the MC146818 registers by reading |
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* the host's clock. |
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*/ |
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static void mc146818_update_time(struct mc_data *d) |
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{ |
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struct tm *tmp; |
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time_t timet; |
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|
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timet = time(NULL); |
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tmp = gmtime(&timet); |
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|
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d->reg[4 * MC_SEC] = tmp->tm_sec; |
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d->reg[4 * MC_MIN] = tmp->tm_min; |
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d->reg[4 * MC_HOUR] = tmp->tm_hour; |
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d->reg[4 * MC_DOW] = tmp->tm_wday + 1; |
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d->reg[4 * MC_DOM] = tmp->tm_mday; |
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d->reg[4 * MC_MONTH] = tmp->tm_mon + 1; |
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d->reg[4 * MC_YEAR] = tmp->tm_year; |
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|
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/* |
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* Special hacks for emulating the behaviour of various machines: |
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*/ |
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switch (d->access_style) { |
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case MC146818_ALGOR: |
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d->reg[4 * MC_YEAR] += 80; |
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break; |
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case MC146818_ARC_NEC: |
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d->reg[4 * MC_YEAR] += (0x18 - 104); |
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break; |
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case MC146818_CATS: |
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d->reg[4 * MC_YEAR] %= 100; |
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break; |
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case MC146818_SGI: |
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/* |
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* NetBSD/sgimips assumes data in BCD format. |
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* Also, IRIX stores the year value in a weird |
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* format, according to ../arch/sgimips/sgimips/clockvar.h |
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* in NetBSD: |
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* |
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* "If year < 1985, store (year - 1970), else |
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* (year - 1940). This matches IRIX semantics." |
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* |
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* Another rule: It seems that a real SGI IP32 box |
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* uses the value 5 for the year 2005. |
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*/ |
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d->reg[4 * MC_YEAR] = |
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d->reg[4 * MC_YEAR] >= 100 ? |
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(d->reg[4 * MC_YEAR] - 100) : |
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( |
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d->reg[4 * MC_YEAR] < 85 ? |
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(d->reg[4 * MC_YEAR] - 30 + 40) |
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: (d->reg[4 * MC_YEAR] - 40) |
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); |
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/* Century: */ |
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d->reg[72 * 4] = 19 + (tmp->tm_year / 100); |
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break; |
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case MC146818_DEC: |
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/* |
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* DECstations must have 72 or 73 in the |
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* Year field, or Ultrix screems. (Weird.) |
| 281 |
*/ |
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d->reg[4 * MC_YEAR] = 72; |
| 283 |
|
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/* |
| 285 |
* Linux on DECstation stores the year in register 63, |
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* but no other DECstation OS does? (Hm.) |
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*/ |
| 288 |
d->reg[4 * 63] = tmp->tm_year - 100; |
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break; |
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} |
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|
| 292 |
if (d->use_bcd) { |
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d->reg[4 * MC_SEC] = to_bcd(d->reg[4 * MC_SEC]); |
| 294 |
d->reg[4 * MC_MIN] = to_bcd(d->reg[4 * MC_MIN]); |
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d->reg[4 * MC_HOUR] = to_bcd(d->reg[4 * MC_HOUR]); |
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d->reg[4 * MC_DOW] = to_bcd(d->reg[4 * MC_DOW]); |
| 297 |
d->reg[4 * MC_DOM] = to_bcd(d->reg[4 * MC_DOM]); |
| 298 |
d->reg[4 * MC_MONTH] = to_bcd(d->reg[4 * MC_MONTH]); |
| 299 |
d->reg[4 * MC_YEAR] = to_bcd(d->reg[4 * MC_YEAR]); |
| 300 |
|
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/* Used by Linux on DECstation: (Hm) */ |
| 302 |
d->reg[4 * 63] = to_bcd(d->reg[4 * 63]); |
| 303 |
|
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/* Used on SGI: */ |
| 305 |
d->reg[4 * 72] = to_bcd(d->reg[4 * 72]); |
| 306 |
} |
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} |
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|
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|
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/* |
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* dev_mc146818_access(): |
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* |
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* TODO: This access function only handles 8-bit accesses! |
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*/ |
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int dev_mc146818_access(struct cpu *cpu, struct memory *mem, |
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uint64_t r, unsigned char *data, size_t len, |
| 317 |
int writeflag, void *extra) |
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{ |
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struct tm *tmp; |
| 320 |
time_t timet; |
| 321 |
struct mc_data *d = extra; |
| 322 |
int i, relative_addr = r; |
| 323 |
|
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relative_addr /= d->addrdiv; |
| 325 |
|
| 326 |
/* Different ways of accessing the registers: */ |
| 327 |
switch (d->access_style) { |
| 328 |
case MC146818_ALGOR: |
| 329 |
case MC146818_CATS: |
| 330 |
case MC146818_PC_CMOS: |
| 331 |
if ((relative_addr & 1) == 0x00) { |
| 332 |
if (writeflag == MEM_WRITE) { |
| 333 |
d->last_addr = data[0]; |
| 334 |
return 1; |
| 335 |
} else { |
| 336 |
data[0] = d->last_addr; |
| 337 |
return 1; |
| 338 |
} |
| 339 |
} else |
| 340 |
relative_addr = d->last_addr * 4; |
| 341 |
break; |
| 342 |
case MC146818_ARC_NEC: |
| 343 |
if (relative_addr == 0x01) { |
| 344 |
if (writeflag == MEM_WRITE) { |
| 345 |
d->last_addr = data[0]; |
| 346 |
return 1; |
| 347 |
} else { |
| 348 |
data[0] = d->last_addr; |
| 349 |
return 1; |
| 350 |
} |
| 351 |
} else if (relative_addr == 0x00) |
| 352 |
relative_addr = d->last_addr * 4; |
| 353 |
else { |
| 354 |
fatal("[ mc146818: not accessed as an " |
| 355 |
"MC146818_ARC_NEC device! ]\n"); |
| 356 |
} |
| 357 |
break; |
| 358 |
case MC146818_ARC_JAZZ: |
| 359 |
/* See comment for dev_mc146818_jazz_access(). */ |
| 360 |
relative_addr = d->last_addr * 4; |
| 361 |
break; |
| 362 |
case MC146818_DEC: |
| 363 |
case MC146818_SGI: |
| 364 |
/* |
| 365 |
* This device was originally written for DECstation |
| 366 |
* emulation, so no changes are necessary for that access |
| 367 |
* style. |
| 368 |
* |
| 369 |
* SGI access bytes 0x0..0xd at offsets 0x0yz..0xdyz, where yz |
| 370 |
* should be ignored. It works _almost_ as DEC, if offsets are |
| 371 |
* divided by 0x40. |
| 372 |
*/ |
| 373 |
break; |
| 374 |
case MC146818_PMPPC: |
| 375 |
relative_addr *= 4; |
| 376 |
break; |
| 377 |
default: |
| 378 |
; |
| 379 |
} |
| 380 |
|
| 381 |
#ifdef MC146818_DEBUG |
| 382 |
if (writeflag == MEM_WRITE) { |
| 383 |
fatal("[ mc146818: write to addr=0x%04x (len %i): ", |
| 384 |
(int)relative_addr, (int)len); |
| 385 |
for (i=0; i<len; i++) |
| 386 |
fatal("0x%02x ", data[i]); |
| 387 |
fatal("]\n"); |
| 388 |
} |
| 389 |
#endif |
| 390 |
|
| 391 |
/* |
| 392 |
* Sprite seems to wants UF interrupt status, once every second, or |
| 393 |
* it hangs forever during bootup. (These do not cause interrupts, |
| 394 |
* but it is good enough... Sprite polls this, iirc.) |
| 395 |
* |
| 396 |
* Linux on at least sgimips and evbmips (Malta) wants the UIP bit |
| 397 |
* in REGA to be updated once a second. |
| 398 |
*/ |
| 399 |
if (relative_addr == MC_REGA*4 || relative_addr == MC_REGC*4) { |
| 400 |
timet = time(NULL); |
| 401 |
tmp = gmtime(&timet); |
| 402 |
d->reg[MC_REGC * 4] &= ~MC_REGC_UF; |
| 403 |
if (tmp->tm_sec != d->previous_second) { |
| 404 |
d->n_seconds_elapsed ++; |
| 405 |
d->previous_second = tmp->tm_sec; |
| 406 |
} |
| 407 |
if (d->n_seconds_elapsed > d->uip_threshold) { |
| 408 |
d->n_seconds_elapsed = 0; |
| 409 |
|
| 410 |
d->reg[MC_REGA * 4] |= MC_REGA_UIP; |
| 411 |
|
| 412 |
d->reg[MC_REGC * 4] |= MC_REGC_UF; |
| 413 |
d->reg[MC_REGC * 4] |= MC_REGC_IRQF; |
| 414 |
|
| 415 |
/* For some reason, some Linux/DECstation KN04 |
| 416 |
kernels want the PF (periodic flag) bit set, |
| 417 |
even though interrupts are not enabled? */ |
| 418 |
d->reg[MC_REGC * 4] |= MC_REGC_PF; |
| 419 |
} else |
| 420 |
d->reg[MC_REGA * 4] &= ~MC_REGA_UIP; |
| 421 |
} |
| 422 |
|
| 423 |
/* RTC data is in either BCD format or binary: */ |
| 424 |
if (d->use_bcd) |
| 425 |
d->reg[MC_REGB * 4] &= ~(1 << 2); |
| 426 |
else |
| 427 |
d->reg[MC_REGB * 4] |= (1 << 2); |
| 428 |
|
| 429 |
/* RTC date/time is always Valid: */ |
| 430 |
d->reg[MC_REGD * 4] |= MC_REGD_VRT; |
| 431 |
|
| 432 |
if (writeflag == MEM_WRITE) { |
| 433 |
/* WRITE: */ |
| 434 |
switch (relative_addr) { |
| 435 |
case MC_REGA*4: |
| 436 |
if ((data[0] & MC_REGA_DVMASK) == MC_BASE_32_KHz) |
| 437 |
d->timebase_hz = 32000; |
| 438 |
if ((data[0] & MC_REGA_DVMASK) == MC_BASE_1_MHz) |
| 439 |
d->timebase_hz = 1000000; |
| 440 |
if ((data[0] & MC_REGA_DVMASK) == MC_BASE_4_MHz) |
| 441 |
d->timebase_hz = 4000000; |
| 442 |
switch (data[0] & MC_REGA_RSMASK) { |
| 443 |
case MC_RATE_NONE: |
| 444 |
d->interrupt_hz = 0; |
| 445 |
break; |
| 446 |
case MC_RATE_1: |
| 447 |
if (d->timebase_hz == 32000) |
| 448 |
d->interrupt_hz = 256; |
| 449 |
else |
| 450 |
d->interrupt_hz = 32768; |
| 451 |
break; |
| 452 |
case MC_RATE_2: |
| 453 |
if (d->timebase_hz == 32000) |
| 454 |
d->interrupt_hz = 128; |
| 455 |
else |
| 456 |
d->interrupt_hz = 16384; |
| 457 |
break; |
| 458 |
case MC_RATE_8192_Hz: d->interrupt_hz = 8192; break; |
| 459 |
case MC_RATE_4096_Hz: d->interrupt_hz = 4096; break; |
| 460 |
case MC_RATE_2048_Hz: d->interrupt_hz = 2048; break; |
| 461 |
case MC_RATE_1024_Hz: d->interrupt_hz = 1024; break; |
| 462 |
case MC_RATE_512_Hz: d->interrupt_hz = 512; break; |
| 463 |
case MC_RATE_256_Hz: d->interrupt_hz = 256; break; |
| 464 |
case MC_RATE_128_Hz: d->interrupt_hz = 128; break; |
| 465 |
case MC_RATE_64_Hz: d->interrupt_hz = 64; break; |
| 466 |
case MC_RATE_32_Hz: d->interrupt_hz = 32; break; |
| 467 |
case MC_RATE_16_Hz: d->interrupt_hz = 16; break; |
| 468 |
case MC_RATE_8_Hz: d->interrupt_hz = 8; break; |
| 469 |
case MC_RATE_4_Hz: d->interrupt_hz = 4; break; |
| 470 |
case MC_RATE_2_Hz: d->interrupt_hz = 2; break; |
| 471 |
default:/* debug("[ mc146818: unimplemented " |
| 472 |
"MC_REGA RS: %i ]\n", |
| 473 |
data[0] & MC_REGA_RSMASK); */ |
| 474 |
; |
| 475 |
} |
| 476 |
|
| 477 |
recalc_interrupt_cycle(cpu, d); |
| 478 |
|
| 479 |
d->cycles_left_until_interrupt = |
| 480 |
d->interrupt_every_x_cycles; |
| 481 |
|
| 482 |
d->reg[MC_REGA * 4] = |
| 483 |
data[0] & (MC_REGA_RSMASK | MC_REGA_DVMASK); |
| 484 |
|
| 485 |
debug("[ rtc set to interrupt every %i:th cycle ]\n", |
| 486 |
d->interrupt_every_x_cycles); |
| 487 |
break; |
| 488 |
case MC_REGB*4: |
| 489 |
if (((data[0] ^ d->reg[MC_REGB*4]) & MC_REGB_PIE)) |
| 490 |
d->cycles_left_until_interrupt = |
| 491 |
d->interrupt_every_x_cycles; |
| 492 |
d->reg[MC_REGB*4] = data[0]; |
| 493 |
if (!(data[0] & MC_REGB_PIE)) { |
| 494 |
cpu_interrupt_ack(cpu, d->irq_nr); |
| 495 |
/* d->cycles_left_until_interrupt = |
| 496 |
d->interrupt_every_x_cycles; */ |
| 497 |
} |
| 498 |
/* debug("[ mc146818: write to MC_REGB, data[0] " |
| 499 |
"= 0x%02x ]\n", data[0]); */ |
| 500 |
break; |
| 501 |
case MC_REGC*4: |
| 502 |
d->reg[MC_REGC * 4] = data[0]; |
| 503 |
debug("[ mc146818: write to MC_REGC, data[0] = " |
| 504 |
"0x%02x ]\n", data[0]); |
| 505 |
break; |
| 506 |
case 0x128: |
| 507 |
d->reg[relative_addr] = data[0]; |
| 508 |
if (data[0] & 8) { |
| 509 |
/* Used on SGI to power off the machine. */ |
| 510 |
fatal("[ md146818: power off ]\n"); |
| 511 |
for (i=0; i<cpu->machine->ncpus; i++) |
| 512 |
cpu->machine->cpus[i]->running = 0; |
| 513 |
cpu->machine-> |
| 514 |
exit_without_entering_debugger = 1; |
| 515 |
} |
| 516 |
break; |
| 517 |
default: |
| 518 |
d->reg[relative_addr] = data[0]; |
| 519 |
|
| 520 |
debug("[ mc146818: unimplemented write to " |
| 521 |
"relative_addr = %08lx: ", (long)relative_addr); |
| 522 |
for (i=0; i<len; i++) |
| 523 |
debug("%02x ", data[i]); |
| 524 |
debug("]\n"); |
| 525 |
} |
| 526 |
} else { |
| 527 |
/* READ: */ |
| 528 |
switch (relative_addr) { |
| 529 |
case 0x01: /* Station's ethernet address (6 bytes) */ |
| 530 |
case 0x05: /* (on DECstation 3100) */ |
| 531 |
case 0x09: |
| 532 |
case 0x0d: |
| 533 |
case 0x11: |
| 534 |
case 0x15: |
| 535 |
break; |
| 536 |
case 4 * MC_SEC: |
| 537 |
if (d->ugly_netbsd_prep_hack_done < NETBSD_HACK_DONE) { |
| 538 |
d->ugly_netbsd_prep_hack_done ++; |
| 539 |
switch (d->ugly_netbsd_prep_hack_done) { |
| 540 |
case NETBSD_HACK_FIRST_1: |
| 541 |
d->ugly_netbsd_prep_hack_sec = |
| 542 |
from_bcd(d->reg[relative_addr]); |
| 543 |
break; |
| 544 |
case NETBSD_HACK_FIRST_2: |
| 545 |
d->reg[relative_addr] = to_bcd( |
| 546 |
d->ugly_netbsd_prep_hack_sec); |
| 547 |
break; |
| 548 |
case NETBSD_HACK_SECOND_1: |
| 549 |
case NETBSD_HACK_SECOND_2: |
| 550 |
d->reg[relative_addr] = to_bcd((1 + |
| 551 |
d->ugly_netbsd_prep_hack_sec) % 60); |
| 552 |
break; |
| 553 |
} |
| 554 |
} |
| 555 |
case 4 * MC_MIN: |
| 556 |
case 4 * MC_HOUR: |
| 557 |
case 4 * MC_DOW: |
| 558 |
case 4 * MC_DOM: |
| 559 |
case 4 * MC_MONTH: |
| 560 |
case 4 * MC_YEAR: |
| 561 |
case 4 * 63: /* 63 is used by Linux on DECstation */ |
| 562 |
case 4 * 72: /* 72 is Century, on SGI (DS1687) */ |
| 563 |
/* |
| 564 |
* If the SET bit is set, then we don't automatically |
| 565 |
* update the values. Otherwise, we update them by |
| 566 |
* reading from the host's clock: |
| 567 |
*/ |
| 568 |
if (d->reg[MC_REGB * 4] & MC_REGB_SET) |
| 569 |
break; |
| 570 |
|
| 571 |
if (d->ugly_netbsd_prep_hack_done >= NETBSD_HACK_DONE) |
| 572 |
mc146818_update_time(d); |
| 573 |
break; |
| 574 |
case 4 * MC_REGA: |
| 575 |
break; |
| 576 |
case 4 * MC_REGC: /* Interrupt ack. */ |
| 577 |
/* NOTE: Acking is done below, _after_ the |
| 578 |
register has been read. */ |
| 579 |
break; |
| 580 |
default:debug("[ mc146818: read from relative_addr = " |
| 581 |
"%04x ]\n", (int)relative_addr); |
| 582 |
} |
| 583 |
|
| 584 |
data[0] = d->reg[relative_addr]; |
| 585 |
|
| 586 |
if (relative_addr == MC_REGC*4) { |
| 587 |
cpu_interrupt_ack(cpu, d->irq_nr); |
| 588 |
/* d->cycles_left_until_interrupt = |
| 589 |
d->interrupt_every_x_cycles; */ |
| 590 |
d->reg[MC_REGC * 4] = 0x00; |
| 591 |
} |
| 592 |
} |
| 593 |
|
| 594 |
#ifdef MC146818_DEBUG |
| 595 |
if (writeflag == MEM_READ) { |
| 596 |
fatal("[ mc146818: read from addr=0x%04x (len %i): ", |
| 597 |
(int)relative_addr, (int)len); |
| 598 |
for (i=0; i<len; i++) |
| 599 |
fatal("0x%02x ", data[i]); |
| 600 |
fatal("]\n"); |
| 601 |
} |
| 602 |
#endif |
| 603 |
|
| 604 |
return 1; |
| 605 |
} |
| 606 |
|
| 607 |
|
| 608 |
/* |
| 609 |
* dev_mc146818_init(): |
| 610 |
* |
| 611 |
* This needs to work for both DECstation emulation and other machine types, |
| 612 |
* so it contains both rtc related stuff and the station's Ethernet address. |
| 613 |
*/ |
| 614 |
void dev_mc146818_init(struct machine *machine, struct memory *mem, |
| 615 |
uint64_t baseaddr, int irq_nr, int access_style, int addrdiv) |
| 616 |
{ |
| 617 |
unsigned char ether_address[6]; |
| 618 |
int i, dev_len; |
| 619 |
struct mc_data *d; |
| 620 |
|
| 621 |
d = malloc(sizeof(struct mc_data)); |
| 622 |
if (d == NULL) { |
| 623 |
fprintf(stderr, "out of memory\n"); |
| 624 |
exit(1); |
| 625 |
} |
| 626 |
|
| 627 |
memset(d, 0, sizeof(struct mc_data)); |
| 628 |
d->irq_nr = irq_nr; |
| 629 |
d->access_style = access_style; |
| 630 |
d->addrdiv = addrdiv; |
| 631 |
|
| 632 |
d->use_bcd = 0; |
| 633 |
switch (access_style) { |
| 634 |
case MC146818_SGI: |
| 635 |
case MC146818_PC_CMOS: |
| 636 |
case MC146818_PMPPC: |
| 637 |
d->use_bcd = 1; |
| 638 |
} |
| 639 |
|
| 640 |
if (machine->machine_type != MACHINE_PREP) { |
| 641 |
/* NetBSD/prep has a really ugly clock detection code; |
| 642 |
all other machines/OSes don't need this. */ |
| 643 |
d->ugly_netbsd_prep_hack_done = NETBSD_HACK_DONE; |
| 644 |
} |
| 645 |
|
| 646 |
if (access_style == MC146818_DEC) { |
| 647 |
/* Station Ethernet Address, on DECstation 3100: */ |
| 648 |
for (i=0; i<6; i++) |
| 649 |
ether_address[i] = 0x10 * (i+1); |
| 650 |
|
| 651 |
d->reg[0x01] = ether_address[0]; |
| 652 |
d->reg[0x05] = ether_address[1]; |
| 653 |
d->reg[0x09] = ether_address[2]; |
| 654 |
d->reg[0x0d] = ether_address[3]; |
| 655 |
d->reg[0x11] = ether_address[4]; |
| 656 |
d->reg[0x15] = ether_address[5]; |
| 657 |
/* TODO: 19, 1d, 21, 25 = checksum bytes 1,2,2,1 resp. */ |
| 658 |
d->reg[0x29] = ether_address[5]; |
| 659 |
d->reg[0x2d] = ether_address[4]; |
| 660 |
d->reg[0x31] = ether_address[3]; |
| 661 |
d->reg[0x35] = ether_address[2]; |
| 662 |
d->reg[0x39] = ether_address[1]; |
| 663 |
d->reg[0x3d] = ether_address[1]; |
| 664 |
d->reg[0x41] = ether_address[0]; |
| 665 |
d->reg[0x45] = ether_address[1]; |
| 666 |
d->reg[0x49] = ether_address[2]; |
| 667 |
d->reg[0x4d] = ether_address[3]; |
| 668 |
d->reg[0x51] = ether_address[4]; |
| 669 |
d->reg[0x55] = ether_address[5]; |
| 670 |
/* TODO: 59, 5d = checksum bytes 1,2 resp. */ |
| 671 |
d->reg[0x61] = 0xff; |
| 672 |
d->reg[0x65] = 0x00; |
| 673 |
d->reg[0x69] = 0x55; |
| 674 |
d->reg[0x6d] = 0xaa; |
| 675 |
d->reg[0x71] = 0xff; |
| 676 |
d->reg[0x75] = 0x00; |
| 677 |
d->reg[0x79] = 0x55; |
| 678 |
d->reg[0x7d] = 0xaa; |
| 679 |
|
| 680 |
/* Battery valid, for DECstations */ |
| 681 |
d->reg[0xf8] = 1; |
| 682 |
} |
| 683 |
|
| 684 |
/* |
| 685 |
* uip_threshold should ideally be 1, but when Linux polls the UIP bit |
| 686 |
* it looses speed. This hack gives Linux the impression that the cpu |
| 687 |
* is uip_threshold times faster than the slow clock it would |
| 688 |
* otherwise detect. |
| 689 |
* |
| 690 |
* TODO: Find out if this messes up Sprite emulation; if so, then |
| 691 |
* this hack has to be removed. |
| 692 |
*/ |
| 693 |
d->uip_threshold = 5; |
| 694 |
|
| 695 |
if (access_style == MC146818_ARC_JAZZ) |
| 696 |
memory_device_register(mem, "mc146818_jazz", 0x90000070ULL, |
| 697 |
1, dev_mc146818_jazz_access, d, DM_DEFAULT, NULL); |
| 698 |
|
| 699 |
dev_len = DEV_MC146818_LENGTH; |
| 700 |
switch (access_style) { |
| 701 |
case MC146818_CATS: |
| 702 |
case MC146818_PC_CMOS: |
| 703 |
dev_len = 2; |
| 704 |
break; |
| 705 |
case MC146818_SGI: |
| 706 |
dev_len = 0x400; |
| 707 |
} |
| 708 |
|
| 709 |
memory_device_register(mem, "mc146818", baseaddr, |
| 710 |
dev_len * addrdiv, dev_mc146818_access, |
| 711 |
d, DM_DEFAULT, NULL); |
| 712 |
|
| 713 |
mc146818_update_time(d); |
| 714 |
|
| 715 |
machine_add_tickfunction(machine, dev_mc146818_tick, d, TICK_SHIFT); |
| 716 |
} |
| 717 |
|
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