OC-PsychOS/sebios.lua

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local component_invoke = component.invoke
function boot_invoke(address, method, ...)
local result = table.pack(pcall(component_invoke, address, method, ...))
if not result[1] then
return nil, result[2]
else
return table.unpack(result, 2, result.n)
end
end
-- backwards compatibility, may remove later
local eeprom = component.list("eeprom")()
computer.getBootAddress = function()
return boot_invoke(eeprom, "getData")
end
computer.setBootAddress = function(address)
return boot_invoke(eeprom, "setData", address)
end
do
local screen = component.list("screen")()
local gpu = component.list("gpu")()
if gpu and screen then
boot_invoke(gpu, "bind", screen)
end
end
local function tryLoadFrom(address)
if component.type(address) == "filesystem" then
local handle, reason = boot_invoke(address, "open", "/init.lua")
if not handle then
return nil, reason
end
local buffer = ""
repeat
local data, reason = boot_invoke(address, "read", handle, math.huge)
if not data and reason then
return nil, reason
end
buffer = buffer .. (data or "")
until not data
boot_invoke(address, "close", handle)
return load(buffer, "=init")
elseif component.type(address) == "tape_drive" then
boot_invoke(address,"seek",-math.huge)
local boottype = boot_invoke(address,"read",1)
if boottype == "!" then
local rl = tonumber(boot_invoke(address,"read",8))
local buffer = boot_invoke(address,"read",rl)
return load(buffer, "=init")
end
end
end
local bootdevs = {}
for address in component.list("filesystem") do
bootdevs[#bootdevs+1] = address
end
for address in component.list("tape_drive") do
bootdevs[#bootdevs+1] = address
end
do
local gA,sA = component.list("gpu")(),component.list("screen")()
if gA and sA then
local gP,cy = component.proxy(gA),1
gP.bind(sA)
local sx, sy = gP.getResolution()
gP.fill(1,1,sx,sy," ")
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local function wl(s)
gP.set(1,cy,s)
cy=cy+1
end
wl("SKS Enhanced BIOS v1")
wl("Memory: "..tostring(computer.totalMemory()/1024).."K")
wl("")
for k,v in ipairs(bootdevs) do
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wl(tostring(k-1).." "..v.." "..component.type(v).." "..component.invoke(v,"getLabel"))
end
local timer = 5
while computer.uptime() < timer do
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t,_,c = computer.pullSignal(0.5)
if t == "key_down" and c > 47 and c < 58 then
computer.setBootAddress(bootdevs[c-47])
wl("Boot device set to "..bootdevs[c-47])
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elseif t == "key_down" and c == 32 then
timer = timer + 10
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end
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end
end
end
local init, reason
if computer.getBootAddress() then
init, reason = tryLoadFrom(computer.getBootAddress())
end
if not init then
computer.setBootAddress()
for k,address in ipairs(bootdevs) do
init, reason = tryLoadFrom(address)
if init then
computer.setBootAddress(address)
break
end
end
end
if not init then
error("no bootable medium found" .. (reason and (": " .. tostring(reason)) or ""), 0)
end
computer.beep(1000, 0.2)
init()