2013-11-06 01:12:55 +01:00
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/**
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* RTC (real time clock) and CMOS
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* @constructor
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*/
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2014-06-15 22:25:17 +02:00
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function RTC(cpu, diskette_type, boot_order)
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2013-11-06 01:12:55 +01:00
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{
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2014-09-25 06:13:54 +02:00
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this.cpu = cpu;
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this.pic = cpu.devices.pic;
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2013-11-06 01:12:55 +01:00
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2014-09-25 06:13:54 +02:00
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this.cmos_index = 0;
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this.boot_order = boot_order;
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this.diskette_type = diskette_type;
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2013-11-06 01:12:55 +01:00
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2014-09-25 06:13:54 +02:00
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// used for cmos entries
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this.rtc_time = Date.now();
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this.last_update = this.rtc_time;
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2014-02-23 23:32:41 +01:00
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2014-09-25 06:13:54 +02:00
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// used for periodic interrupt
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this.next_interrupt = 0;
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2013-11-06 01:12:55 +01:00
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2014-09-25 06:13:54 +02:00
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this.cmos_c_was_read = true;
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2013-11-06 01:12:55 +01:00
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2014-09-25 06:13:54 +02:00
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this.periodic_interrupt = false;
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2013-11-06 01:12:55 +01:00
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2014-09-25 06:13:54 +02:00
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// corresponds to default value for cmos_a
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this.periodic_interrupt_time = 1000 / 1024;
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2013-11-06 01:12:55 +01:00
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2014-09-25 06:13:54 +02:00
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this.cmos_a = 0x26;
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this.cmos_b = 2;
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this.cmos_c = 0;
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2013-11-06 01:12:55 +01:00
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this.nmi_disabled = 0;
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2014-10-21 21:51:42 +02:00
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cpu.io.register_write(0x70, this, function(out_byte)
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2014-09-25 06:13:54 +02:00
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{
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this.cmos_index = out_byte & 0x7F;
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this.nmi_disabled = out_byte >> 7;
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2014-10-21 21:51:42 +02:00
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});
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2014-09-25 06:13:54 +02:00
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2014-10-21 21:51:42 +02:00
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cpu.io.register_write(0x71, this, this.cmos_write);
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cpu.io.register_read(0x71, this, this.cmos_read);
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2014-09-29 07:10:47 +02:00
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this._state_skip = ["cpu", "pic"];
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2014-09-25 06:13:54 +02:00
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}
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RTC.prototype.timer = function(time, legacy_mode)
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{
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if(this.periodic_interrupt && this.cmos_c_was_read && this.next_interrupt < time)
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2013-11-06 01:12:55 +01:00
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{
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2014-09-25 06:13:54 +02:00
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this.cmos_c_was_read = false;
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this.pic.push_irq(8);
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this.cmos_c |= 1 << 6;
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2013-11-06 01:12:55 +01:00
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2014-09-25 06:13:54 +02:00
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this.next_interrupt += this.periodic_interrupt_time *
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Math.ceil((time - this.next_interrupt) / this.periodic_interrupt_time);
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}
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2013-11-06 01:12:55 +01:00
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2014-09-25 06:13:54 +02:00
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this.rtc_time += time - this.last_update;
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this.last_update = time;
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};
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2013-11-06 01:12:55 +01:00
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2014-09-25 06:13:54 +02:00
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RTC.prototype.bcd_pack = function(n)
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{
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var i = 0,
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result = 0,
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digit;
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while(n)
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2013-11-06 01:12:55 +01:00
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{
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2014-09-25 06:13:54 +02:00
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digit = n % 10;
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2014-03-11 16:58:35 +01:00
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2014-09-25 06:13:54 +02:00
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result |= digit << (4 * i);
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i++;
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n = (n - digit) / 10;
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}
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return result;
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};
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2014-03-11 16:58:35 +01:00
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2014-09-25 06:13:54 +02:00
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RTC.prototype.encode_time = function(t)
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{
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if(this.cmos_b & 4)
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2013-11-06 01:12:55 +01:00
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{
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2014-09-25 06:13:54 +02:00
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// binary mode
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return t;
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2013-11-06 01:12:55 +01:00
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}
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2014-09-25 06:13:54 +02:00
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else
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{
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return this.bcd_pack(t);
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}
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};
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// TODO
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// - interrupt on update
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// - countdown
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// - letting bios/os set values
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// (none of these are used by seabios or the OSes we're
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// currently testing)
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RTC.prototype.cmos_read = function()
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{
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var index = this.cmos_index;
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//this.cmos_index = 0xD;
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2013-11-06 01:12:55 +01:00
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2014-09-25 06:13:54 +02:00
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switch(index)
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2013-11-06 01:12:55 +01:00
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{
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2014-09-25 06:13:54 +02:00
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case 0:
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return this.encode_time(new Date(this.rtc_time).getUTCSeconds());
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case 2:
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return this.encode_time(new Date(this.rtc_time).getUTCMinutes());
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case 4:
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// TODO: 12 hour mode
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return this.encode_time(new Date(this.rtc_time).getUTCHours());
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case 7:
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return this.encode_time(new Date(this.rtc_time).getUTCDate());
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case 8:
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return this.encode_time(new Date(this.rtc_time).getUTCMonth() + 1);
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case 9:
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return this.encode_time(new Date(this.rtc_time).getUTCFullYear() % 100);
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case 0xA:
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return this.cmos_a;
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case 0xB:
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//dbg_log("cmos read from index " + h(index));
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return this.cmos_b;
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case 0xE:
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// post info
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return 0;
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case 0xC:
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this.cmos_c_was_read = true;
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// TODO:
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// It is important to know that upon a IRQ 8, Status Register C
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// will contain a bitmask telling which interrupt happened.
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// What is important is that if register C is not read after an
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// IRQ 8, then the interrupt will not happen again.
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dbg_log("cmos reg C read", LOG_RTC);
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// Missing IRQF flag
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//return cmos_b & 0x70;
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return this.cmos_c;
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case 0xF:
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return 0;
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case 0x10:
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// floppy type
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return this.diskette_type;
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case 0x14:
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// equipment
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return 0x2D;
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case 0x32:
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return this.encode_time(new Date(this.rtc_time).getUTCFullYear() / 100 | 0);
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case 0x34:
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return (this.cpu.memory_size - 16 * 1024 * 1024) >> 16 & 0xff;
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case 0x35:
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return (this.cpu.memory_size - 16 * 1024 * 1024) >> 24 & 0xff;
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case 0x38:
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// used by seabios to determine the boot order
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// Nibble
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// 1: FloppyPrio
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// 2: HDPrio
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// 3: CDPrio
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// 4: BEVPrio
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// bootflag 1, high nibble, lowest priority
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// Low nibble: Disable floppy signature check (1)
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return 1 | this.boot_order >> 4 & 0xF0;
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case 0x3D:
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// bootflag 2, both nibbles, high and middle priority
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return this.boot_order & 0xFF;
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case 0x5B:
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case 0x5C:
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case 0x5D:
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// memory above 4GB
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return 0;
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2013-11-06 01:12:55 +01:00
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}
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2014-09-25 06:13:54 +02:00
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dbg_log("cmos read from index " + h(index), LOG_RTC);
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return 0xFF;
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};
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RTC.prototype.cmos_write = function(data_byte)
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{
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switch(this.cmos_index)
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2013-11-06 01:12:55 +01:00
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{
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2014-09-25 06:13:54 +02:00
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case 0xA:
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this.cmos_a = data_byte & 0x7F;
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this.periodic_interrupt_time = 1000 / (32768 >> (this.cmos_a & 0xF) - 1);
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dbg_log("Periodic interrupt, a=" + h(this.cmos_a, 2) + " t=" + this.periodic_interrupt_time , LOG_RTC);
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break;
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case 0xB:
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this.cmos_b = data_byte;
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if(this.cmos_b & 0x40)
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{
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this.next_interrupt = Date.now();
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}
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if(this.cmos_b & 0x20) dbg_log("Unimplemented: alarm interrupt");
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if(this.cmos_b & 0x10) dbg_log("Unimplemented: updated interrupt");
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dbg_log("cmos b=" + h(this.cmos_b, 2), LOG_RTC);
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break;
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default:
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dbg_log("cmos write index " + h(this.cmos_index) + ": " + h(data_byte), LOG_RTC);
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2013-11-06 01:12:55 +01:00
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}
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2014-09-25 06:13:54 +02:00
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this.periodic_interrupt = (this.cmos_b & 0x40) === 0x40 && (this.cmos_a & 0xF) > 0;
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};
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