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added some comments to IDE CMOS setup

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Christian Schnell 2025-05-18 14:58:08 +02:00 • committed by Fabian
parent 40dab74fa5
commit 2add432dbf
1 changed files with 26 additions and 16 deletions
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42
src/ide.js
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@ -614,7 +614,7 @@ function IDEInterface(channel, cpu, buffer, is_cd, channel_nr, interface_nr, bus
* @const
* @type {number}
*/
this.nr = channel_nr;
this.channel_nr = channel_nr;
/**
* @const
@ -786,22 +786,32 @@ IDEInterface.prototype.set_disk_buffer = function(buffer)
this.cylinder_count = Math.floor(this.cylinder_count);
}
var rtc = this.cpu.devices.rtc;
// for CMOS see:
// https://github.com/copy/v86/blob/master/src/rtc.js
// https://github.com/coreboot/seabios/blob/master/src/hw/rtc.h
// https://web.archive.org/web/20240119203005/http://www.bioscentral.com/misc/cmosmap.htm
const rtc = this.cpu.devices.rtc;
// master
rtc.cmos_write(CMOS_BIOS_DISKTRANSFLAG,
rtc.cmos_read(CMOS_BIOS_DISKTRANSFLAG) | 1 << this.nr * 4);
rtc.cmos_write(CMOS_BIOS_DISKTRANSFLAG, // TODO: what is this doing, setting LBA translation?
rtc.cmos_read(CMOS_BIOS_DISKTRANSFLAG) | 1 << this.channel_nr * 4);
// set hard disk type (CMOS_DISK_DATA = 0x12) of C: to 0b1111, keep type of D:
// bits 0-3: hard disk type of D:
// bits 4-7: hard disk type of C:
// TODO: should this not also set CMOS_DISK_DRIVE1_TYPE to a hard disk type (see SeaBIOS rtc.h)?
rtc.cmos_write(CMOS_DISK_DATA, rtc.cmos_read(CMOS_DISK_DATA) & 0x0F | 0xF0);
var reg = this.nr === 0 ? CMOS_DISK_DRIVE1_CYL : CMOS_DISK_DRIVE2_CYL;
rtc.cmos_write(reg + 0, this.cylinder_count & 0xFF);
rtc.cmos_write(reg + 1, this.cylinder_count >> 8 & 0xFF);
rtc.cmos_write(reg + 2, this.head_count & 0xFF);
rtc.cmos_write(reg + 3, 0xFF);
rtc.cmos_write(reg + 4, 0xFF);
rtc.cmos_write(reg + 5, 0xC8);
rtc.cmos_write(reg + 6, this.cylinder_count & 0xFF);
rtc.cmos_write(reg + 7, this.cylinder_count >> 8 & 0xFF);
rtc.cmos_write(reg + 8, this.sectors_per_track & 0xFF);
const drive_reg = this.channel_nr === 0 ? CMOS_DISK_DRIVE1_CYL : CMOS_DISK_DRIVE2_CYL; // 0x1B : 0x24 (drive C: or D:)
rtc.cmos_write(drive_reg + 0, this.cylinder_count & 0xFF); // number of cylinders least significant byte
rtc.cmos_write(drive_reg + 1, this.cylinder_count >> 8 & 0xFF); // number of cylinders most significant byte
rtc.cmos_write(drive_reg + 2, this.head_count & 0xFF); // number of heads
rtc.cmos_write(drive_reg + 3, 0xFF); // write precomp cylinder least significant byte
rtc.cmos_write(drive_reg + 4, 0xFF); // write precomp cylinder most significant byte
rtc.cmos_write(drive_reg + 5, 0xC8); // control byte
rtc.cmos_write(drive_reg + 6, this.cylinder_count & 0xFF); // landing zone least significant byte
rtc.cmos_write(drive_reg + 7, this.cylinder_count >> 8 & 0xFF); // landing zone most significant byte
rtc.cmos_write(drive_reg + 8, this.sectors_per_track & 0xFF); // number of sectors
if(this.channel.cpu)
{
@ -2214,13 +2224,13 @@ IDEInterface.prototype.report_read_start = function()
IDEInterface.prototype.report_read_end = function(byte_count)
{
const sector_count = byte_count / this.sector_size | 0;
this.bus.send("ide-read-end", [this.nr, byte_count, sector_count]);
this.bus.send("ide-read-end", [this.channel_nr, byte_count, sector_count]);
};
IDEInterface.prototype.report_write = function(byte_count)
{
const sector_count = byte_count / this.sector_size | 0;
this.bus.send("ide-write-end", [this.nr, byte_count, sector_count]);
this.bus.send("ide-write-end", [this.channel_nr, byte_count, sector_count]);
};
IDEInterface.prototype.read_buffer = function(start, length, callback)