jslinux/jslinux.js

98 lines
2.0 KiB
JavaScript

/*
Linux launcher
Copyright (c) 2011 Fabrice Bellard
Redistribution or commercial use is prohibited without the author's
permission.
*/
"use strict";
var term, pc, boot_start_time;
function term_start()
{
term = new Term(80, 30, term_handler);
term.open();
}
/* send chars to the serial port */
function term_handler(str)
{
pc.serial.send_chars(str);
}
function clipboard_set(val)
{
var el;
el = document.getElementById("text_clipboard");
el.value = val;
}
function clipboard_get()
{
var el;
el = document.getElementById("text_clipboard");
return el.value;
}
function clear_clipboard()
{
var el;
el = document.getElementById("text_clipboard");
el.value = "";
}
/* just used to display the boot time in the VM */
function get_boot_time()
{
return (+new Date()) - boot_start_time;
}
function start()
{
var start_addr, initrd_size, params, cmdline_addr;
params = new Object();
/* serial output chars */
params.serial_write = term.write.bind(term);
/* memory size (in bytes) */
params.mem_size = 16 * 1024 * 1024;
/* clipboard I/O */
params.clipboard_get = clipboard_get;
params.clipboard_set = clipboard_set;
params.get_boot_time = get_boot_time;
pc = new PCEmulator(params);
pc.load_binary("vmlinux-2.6.20.bin", 0x00100000);
initrd_size = pc.load_binary("root.bin", 0x00400000);
start_addr = 0x10000;
pc.load_binary("linuxstart.bin", start_addr);
/* set the Linux kernel command line */
/* Note: we don't use initramfs because it is not possible to
disable gzip decompression in this case, which would be too
slow. */
cmdline_addr = 0xf800;
pc.cpu.write_string(cmdline_addr, "console=ttyS0 root=/dev/ram0 rw init=/sbin/init notsc=1");
pc.cpu.eip = start_addr;
pc.cpu.regs[0] = params.mem_size; /* eax */
pc.cpu.regs[3] = initrd_size; /* ebx */
pc.cpu.regs[1] = cmdline_addr; /* ecx */
boot_start_time = (+new Date());
pc.start();
}
term_start();