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