blob: b0eba22ca5c32689c1509ba7b4da05d4de6b7126 [file] [log] [blame] [raw]
"use strict";
/** @const */ var CMOS_RTC_SECONDS = 0x00;
/** @const */ var CMOS_RTC_SECONDS_ALARM = 0x01;
/** @const */ var CMOS_RTC_MINUTES = 0x02;
/** @const */ var CMOS_RTC_MINUTES_ALARM = 0x03;
/** @const */ var CMOS_RTC_HOURS = 0x04;
/** @const */ var CMOS_RTC_HOURS_ALARM = 0x05;
/** @const */ var CMOS_RTC_DAY_WEEK = 0x06;
/** @const */ var CMOS_RTC_DAY_MONTH = 0x07;
/** @const */ var CMOS_RTC_MONTH = 0x08;
/** @const */ var CMOS_RTC_YEAR = 0x09;
/** @const */ var CMOS_STATUS_A = 0x0a;
/** @const */ var CMOS_STATUS_B = 0x0b;
/** @const */ var CMOS_STATUS_C = 0x0c;
/** @const */ var CMOS_STATUS_D = 0x0d;
/** @const */ var CMOS_RESET_CODE = 0x0f;
/** @const */ var CMOS_FLOPPY_DRIVE_TYPE = 0x10;
/** @const */ var CMOS_DISK_DATA = 0x12;
/** @const */ var CMOS_EQUIPMENT_INFO = 0x14;
/** @const */ var CMOS_MEM_BASE_LOW = 0x15;
/** @const */ var CMOS_MEM_BASE_HIGH = 0x16;
/** @const */ var CMOS_MEM_OLD_EXT_LOW = 0x17;
/** @const */ var CMOS_MEM_OLD_EXT_HIGH = 0x18;
/** @const */ var CMOS_DISK_DRIVE1_TYPE = 0x19;
/** @const */ var CMOS_DISK_DRIVE2_TYPE = 0x1a;
/** @const */ var CMOS_DISK_DRIVE1_CYL = 0x1b;
/** @const */ var CMOS_DISK_DRIVE2_CYL = 0x24;
/** @const */ var CMOS_MEM_EXTMEM_LOW = 0x30;
/** @const */ var CMOS_MEM_EXTMEM_HIGH = 0x31;
/** @const */ var CMOS_CENTURY = 0x32;
/** @const */ var CMOS_MEM_EXTMEM2_LOW = 0x34;
/** @const */ var CMOS_MEM_EXTMEM2_HIGH = 0x35;
/** @const */ var CMOS_BIOS_BOOTFLAG1 = 0x38;
/** @const */ var CMOS_BIOS_DISKTRANSFLAG = 0x39;
/** @const */ var CMOS_BIOS_BOOTFLAG2 = 0x3d;
/** @const */ var CMOS_MEM_HIGHMEM_LOW = 0x5b;
/** @const */ var CMOS_MEM_HIGHMEM_MID = 0x5c;
/** @const */ var CMOS_MEM_HIGHMEM_HIGH = 0x5d;
/** @const */ var CMOS_BIOS_SMP_COUNT = 0x5f;
/**
* RTC (real time clock) and CMOS
* @constructor
* @param {CPU} cpu
*/
function RTC(cpu)
{
/** @const @type {CPU} */
this.cpu = cpu;
this.cmos_index = 0;
this.cmos_data = new Uint8Array(128);
// used for cmos entries
this.rtc_time = Date.now();
this.last_update = this.rtc_time;
// used for periodic interrupt
this.next_interrupt = 0;
this.periodic_interrupt = false;
// corresponds to default value for cmos_a
this.periodic_interrupt_time = 1000 / 1024;
this.cmos_a = 0x26;
this.cmos_b = 2;
this.cmos_c = 0;
this.nmi_disabled = 0;
cpu.io.register_write(0x70, this, function(out_byte)
{
this.cmos_index = out_byte & 0x7F;
this.nmi_disabled = out_byte >> 7;
});
cpu.io.register_write(0x71, this, this.cmos_port_write);
cpu.io.register_read(0x71, this, this.cmos_port_read);
}
RTC.prototype.get_state = function()
{
var state = [];
state[0] = this.cmos_index;
state[1] = this.cmos_data;
state[2] = this.rtc_time;
state[3] = this.last_update;
state[4] = this.next_interrupt;
state[6] = this.periodic_interrupt;
state[7] = this.periodic_interrupt_time;
state[8] = this.cmos_a;
state[9] = this.cmos_b;
state[10] = this.cmos_c;
state[11] = this.nmi_disabled;
return state;
};
RTC.prototype.set_state = function(state)
{
this.cmos_index = state[0];
this.cmos_data = state[1];
this.rtc_time = state[2];
this.last_update = state[3];
this.next_interrupt = state[4];
this.periodic_interrupt = state[6];
this.periodic_interrupt_time = state[7];
this.cmos_a = state[8];
this.cmos_b = state[9];
this.cmos_c = state[10];
this.nmi_disabled = state[11];
};
RTC.prototype.timer = function(time, legacy_mode)
{
time = Date.now(); // XXX
this.rtc_time += time - this.last_update;
this.last_update = time;
if(this.periodic_interrupt && this.next_interrupt < time)
{
this.cpu.device_raise_irq(8);
this.cmos_c |= 1 << 6 | 1 << 7;
this.next_interrupt += this.periodic_interrupt_time *
Math.ceil((time - this.next_interrupt) / this.periodic_interrupt_time);
return Math.max(0, time - this.next_interrupt);
}
return 100;
};
RTC.prototype.bcd_pack = function(n)
{
var i = 0,
result = 0,
digit;
while(n)
{
digit = n % 10;
result |= digit << (4 * i);
i++;
n = (n - digit) / 10;
}
return result;
};
RTC.prototype.encode_time = function(t)
{
if(this.cmos_b & 4)
{
// binary mode
return t;
}
else
{
return this.bcd_pack(t);
}
};
// TODO
// - interrupt on update
// - countdown
// - letting bios/os set values
// (none of these are used by seabios or the OSes we're
// currently testing)
RTC.prototype.cmos_port_read = function()
{
var index = this.cmos_index;
//this.cmos_index = 0xD;
switch(index)
{
case CMOS_RTC_SECONDS:
return this.encode_time(new Date(this.rtc_time).getUTCSeconds());
case CMOS_RTC_MINUTES:
return this.encode_time(new Date(this.rtc_time).getUTCMinutes());
case CMOS_RTC_HOURS:
// TODO: 12 hour mode
return this.encode_time(new Date(this.rtc_time).getUTCHours());
case CMOS_RTC_DAY_MONTH:
return this.encode_time(new Date(this.rtc_time).getUTCDate());
case CMOS_RTC_MONTH:
return this.encode_time(new Date(this.rtc_time).getUTCMonth() + 1);
case CMOS_RTC_YEAR:
return this.encode_time(new Date(this.rtc_time).getUTCFullYear() % 100);
case CMOS_STATUS_A:
return this.cmos_a;
case CMOS_STATUS_B:
//dbg_log("cmos read from index " + h(index));
return this.cmos_b;
case CMOS_STATUS_C:
// It is important to know that upon a IRQ 8, Status Register C
// will contain a bitmask telling which interrupt happened.
// What is important is that if register C is not read after an
// IRQ 8, then the interrupt will not happen again.
this.cpu.device_lower_irq(8);
dbg_log("cmos reg C read", LOG_RTC);
// Missing IRQF flag
//return cmos_b & 0x70;
var c = this.cmos_c;
this.cmos_c &= ~0xF0;
return c;
case CMOS_STATUS_D:
return 0xFF;
case CMOS_CENTURY:
return this.encode_time(new Date(this.rtc_time).getUTCFullYear() / 100 | 0);
default:
dbg_log("cmos read from index " + h(index), LOG_RTC);
return this.cmos_data[this.cmos_index];
}
};
RTC.prototype.cmos_port_write = function(data_byte)
{
switch(this.cmos_index)
{
case 0xA:
this.cmos_a = data_byte & 0x7F;
this.periodic_interrupt_time = 1000 / (32768 >> (this.cmos_a & 0xF) - 1);
dbg_log("Periodic interrupt, a=" + h(this.cmos_a, 2) + " t=" + this.periodic_interrupt_time , LOG_RTC);
break;
case 0xB:
this.cmos_b = data_byte;
if(this.cmos_b & 0x40)
{
this.next_interrupt = Date.now();
}
if(this.cmos_b & 0x20) dbg_log("Unimplemented: alarm interrupt", LOG_RTC);
if(this.cmos_b & 0x10) dbg_log("Unimplemented: updated interrupt", LOG_RTC);
dbg_log("cmos b=" + h(this.cmos_b, 2), LOG_RTC);
break;
default:
dbg_log("cmos write index " + h(this.cmos_index) + ": " + h(data_byte), LOG_RTC);
}
this.periodic_interrupt = (this.cmos_b & 0x40) === 0x40 && (this.cmos_a & 0xF) > 0;
};
/**
* @param {number} index
*/
RTC.prototype.cmos_read = function(index)
{
dbg_assert(index < 128);
return this.cmos_data[index];
};
/**
* @param {number} index
* @param {number} value
*/
RTC.prototype.cmos_write = function(index, value)
{
dbg_log("cmos " + h(index) + " <- " + h(value), LOG_RTC);
dbg_assert(index < 128);
this.cmos_data[index] = value;
};