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# font8x8_basic (printable ASCII 0x20..0x7f), one row of 8 glyphs per line
# each glyph is 8 bytes; bit 0 (LSB) of a byte is the leftmost pixel
global FONT = {
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x18, 0x3C, 0x3C, 0x18, 0x18, 0x00, 0x18, 0x00 },
{ 0x36, 0x36, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x36, 0x36, 0x7F, 0x36, 0x7F, 0x36, 0x36, 0x00 },
{ 0x0C, 0x3E, 0x03, 0x1E, 0x30, 0x1F, 0x0C, 0x00 },
{ 0x00, 0x63, 0x33, 0x18, 0x0C, 0x66, 0x63, 0x00 },
{ 0x1C, 0x36, 0x1C, 0x6E, 0x3B, 0x33, 0x6E, 0x00 },
{ 0x06, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x18, 0x0C, 0x06, 0x06, 0x06, 0x0C, 0x18, 0x00 },
{ 0x06, 0x0C, 0x18, 0x18, 0x18, 0x0C, 0x06, 0x00 },
{ 0x00, 0x66, 0x3C, 0xFF, 0x3C, 0x66, 0x00, 0x00 },
{ 0x00, 0x0C, 0x0C, 0x3F, 0x0C, 0x0C, 0x00, 0x00 },
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x0C, 0x0C, 0x06 },
{ 0x00, 0x00, 0x00, 0x3F, 0x00, 0x00, 0x00, 0x00 },
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x0C, 0x0C, 0x00 },
{ 0x60, 0x30, 0x18, 0x0C, 0x06, 0x03, 0x01, 0x00 },
{ 0x3E, 0x63, 0x73, 0x7B, 0x6F, 0x67, 0x3E, 0x00 },
{ 0x0C, 0x0E, 0x0C, 0x0C, 0x0C, 0x0C, 0x3F, 0x00 },
{ 0x1E, 0x33, 0x30, 0x1C, 0x06, 0x33, 0x3F, 0x00 },
{ 0x1E, 0x33, 0x30, 0x1C, 0x30, 0x33, 0x1E, 0x00 },
{ 0x38, 0x3C, 0x36, 0x33, 0x7F, 0x30, 0x78, 0x00 },
{ 0x3F, 0x03, 0x1F, 0x30, 0x30, 0x33, 0x1E, 0x00 },
{ 0x1C, 0x06, 0x03, 0x1F, 0x33, 0x33, 0x1E, 0x00 },
{ 0x3F, 0x33, 0x30, 0x18, 0x0C, 0x0C, 0x0C, 0x00 },
{ 0x1E, 0x33, 0x33, 0x1E, 0x33, 0x33, 0x1E, 0x00 },
{ 0x1E, 0x33, 0x33, 0x3E, 0x30, 0x18, 0x0E, 0x00 },
{ 0x00, 0x0C, 0x0C, 0x00, 0x00, 0x0C, 0x0C, 0x00 },
{ 0x00, 0x0C, 0x0C, 0x00, 0x00, 0x0C, 0x0C, 0x06 },
{ 0x18, 0x0C, 0x06, 0x03, 0x06, 0x0C, 0x18, 0x00 },
{ 0x00, 0x00, 0x3F, 0x00, 0x00, 0x3F, 0x00, 0x00 },
{ 0x06, 0x0C, 0x18, 0x30, 0x18, 0x0C, 0x06, 0x00 },
{ 0x1E, 0x33, 0x30, 0x18, 0x0C, 0x00, 0x0C, 0x00 },
{ 0x3E, 0x63, 0x7B, 0x7B, 0x7B, 0x03, 0x1E, 0x00 },
{ 0x0C, 0x1E, 0x33, 0x33, 0x3F, 0x33, 0x33, 0x00 },
{ 0x3F, 0x66, 0x66, 0x3E, 0x66, 0x66, 0x3F, 0x00 },
{ 0x3C, 0x66, 0x03, 0x03, 0x03, 0x66, 0x3C, 0x00 },
{ 0x1F, 0x36, 0x66, 0x66, 0x66, 0x36, 0x1F, 0x00 },
{ 0x7F, 0x46, 0x16, 0x1E, 0x16, 0x46, 0x7F, 0x00 },
{ 0x7F, 0x46, 0x16, 0x1E, 0x16, 0x06, 0x0F, 0x00 },
{ 0x3C, 0x66, 0x03, 0x03, 0x73, 0x66, 0x7C, 0x00 },
{ 0x33, 0x33, 0x33, 0x3F, 0x33, 0x33, 0x33, 0x00 },
{ 0x1E, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x1E, 0x00 },
{ 0x78, 0x30, 0x30, 0x30, 0x33, 0x33, 0x1E, 0x00 },
{ 0x67, 0x66, 0x36, 0x1E, 0x36, 0x66, 0x67, 0x00 },
{ 0x0F, 0x06, 0x06, 0x06, 0x46, 0x66, 0x7F, 0x00 },
{ 0x63, 0x77, 0x7F, 0x7F, 0x6B, 0x63, 0x63, 0x00 },
{ 0x63, 0x67, 0x6F, 0x7B, 0x73, 0x63, 0x63, 0x00 },
{ 0x1C, 0x36, 0x63, 0x63, 0x63, 0x36, 0x1C, 0x00 },
{ 0x3F, 0x66, 0x66, 0x3E, 0x06, 0x06, 0x0F, 0x00 },
{ 0x1E, 0x33, 0x33, 0x33, 0x3B, 0x1E, 0x38, 0x00 },
{ 0x3F, 0x66, 0x66, 0x3E, 0x36, 0x66, 0x67, 0x00 },
{ 0x1E, 0x33, 0x07, 0x0E, 0x38, 0x33, 0x1E, 0x00 },
{ 0x3F, 0x2D, 0x0C, 0x0C, 0x0C, 0x0C, 0x1E, 0x00 },
{ 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x3F, 0x00 },
{ 0x33, 0x33, 0x33, 0x33, 0x33, 0x1E, 0x0C, 0x00 },
{ 0x63, 0x63, 0x63, 0x6B, 0x7F, 0x77, 0x63, 0x00 },
{ 0x63, 0x63, 0x36, 0x1C, 0x1C, 0x36, 0x63, 0x00 },
{ 0x33, 0x33, 0x33, 0x1E, 0x0C, 0x0C, 0x1E, 0x00 },
{ 0x7F, 0x63, 0x31, 0x18, 0x4C, 0x66, 0x7F, 0x00 },
{ 0x1E, 0x06, 0x06, 0x06, 0x06, 0x06, 0x1E, 0x00 },
{ 0x03, 0x06, 0x0C, 0x18, 0x30, 0x60, 0x40, 0x00 },
{ 0x1E, 0x18, 0x18, 0x18, 0x18, 0x18, 0x1E, 0x00 },
{ 0x08, 0x1C, 0x36, 0x63, 0x00, 0x00, 0x00, 0x00 },
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF },
{ 0x0C, 0x0C, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x00, 0x00, 0x1E, 0x30, 0x3E, 0x33, 0x6E, 0x00 },
{ 0x07, 0x06, 0x06, 0x3E, 0x66, 0x66, 0x3B, 0x00 },
{ 0x00, 0x00, 0x1E, 0x33, 0x03, 0x33, 0x1E, 0x00 },
{ 0x38, 0x30, 0x30, 0x3E, 0x33, 0x33, 0x6E, 0x00 },
{ 0x00, 0x00, 0x1E, 0x33, 0x3F, 0x03, 0x1E, 0x00 },
{ 0x1C, 0x36, 0x06, 0x0F, 0x06, 0x06, 0x0F, 0x00 },
{ 0x00, 0x00, 0x6E, 0x33, 0x33, 0x3E, 0x30, 0x1F },
{ 0x07, 0x06, 0x36, 0x6E, 0x66, 0x66, 0x67, 0x00 },
{ 0x0C, 0x00, 0x0E, 0x0C, 0x0C, 0x0C, 0x1E, 0x00 },
{ 0x30, 0x00, 0x30, 0x30, 0x30, 0x33, 0x33, 0x1E },
{ 0x07, 0x06, 0x66, 0x36, 0x1E, 0x36, 0x67, 0x00 },
{ 0x0E, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x1E, 0x00 },
{ 0x00, 0x00, 0x33, 0x7F, 0x7F, 0x6B, 0x63, 0x00 },
{ 0x00, 0x00, 0x1F, 0x33, 0x33, 0x33, 0x33, 0x00 },
{ 0x00, 0x00, 0x1E, 0x33, 0x33, 0x33, 0x1E, 0x00 },
{ 0x00, 0x00, 0x3B, 0x66, 0x66, 0x3E, 0x06, 0x0F },
{ 0x00, 0x00, 0x6E, 0x33, 0x33, 0x3E, 0x30, 0x78 },
{ 0x00, 0x00, 0x3B, 0x6E, 0x66, 0x06, 0x0F, 0x00 },
{ 0x00, 0x00, 0x3E, 0x03, 0x1E, 0x30, 0x1F, 0x00 },
{ 0x08, 0x0C, 0x3E, 0x0C, 0x0C, 0x2C, 0x18, 0x00 },
{ 0x00, 0x00, 0x33, 0x33, 0x33, 0x33, 0x6E, 0x00 },
{ 0x00, 0x00, 0x33, 0x33, 0x33, 0x1E, 0x0C, 0x00 },
{ 0x00, 0x00, 0x63, 0x6B, 0x7F, 0x7F, 0x36, 0x00 },
{ 0x00, 0x00, 0x63, 0x36, 0x1C, 0x36, 0x63, 0x00 },
{ 0x00, 0x00, 0x33, 0x33, 0x33, 0x3E, 0x30, 0x1F },
{ 0x00, 0x00, 0x3F, 0x19, 0x0C, 0x26, 0x3F, 0x00 },
{ 0x38, 0x0C, 0x0C, 0x07, 0x0C, 0x0C, 0x38, 0x00 },
{ 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x00 },
{ 0x07, 0x0C, 0x0C, 0x38, 0x0C, 0x0C, 0x07, 0x00 },
{ 0x6E, 0x3B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
}
const SCALE = 2
const CW = 8 * SCALE
const CH = 8 * SCALE
const FG = 0xd0d0d0
const CON_BG = 0x101018
global con = { col = 0, row = 0 }
fn con_cols() fb_width() / CW
fn con_rows() fb_height() / CH
fn draw_glyph(col, row, ch) do
const x0 = col * CW
const y0 = row * CH
fill_rect(x0, y0, CW, CH, CON_BG) # clear the cell
const code = ch:ascii()
if code < 32 return :nil
if code > 127 return :nil
const g = FONT[code - 32]
for fy in 0..8 do
const bits = g[fy]
for fx in 0..8 do
if (bits shr fx) band 1 == 1 fill_rect(x0 + fx * SCALE, y0 + fy * SCALE, SCALE, SCALE, FG)
end
end
end
fn con_newline() do
con.col = 0
con.row = con.row + 1
if con.row >= con_rows() do
fb_scroll(CH, CON_BG)
con.row = con_rows() - 1
end
end
# we dont do Shift/Cntrl
# thats a job for future me lmao
fn con_putc(ch) do
const code = ch:ascii()
if code == 10 do con_newline() return :nil end # \n
if code == 13 do con.col = 0 return :nil end # \r
if code == 8 do # backspace: move left
if con.col > 0 con.col = con.col - 1
return :nil
end
if code < 32 return :nil
draw_glyph(con.col, con.row, ch)
con.col = con.col + 1
if con.col >= con_cols() con_newline()
end
# render a string to the screen and mirror to serial
fn puts(s) do
serial_puts(s)
for i in 0..s:len() do con_putc(s[i]) end
end
# keyboard scancode table
# ts is NOT a good way to write a driver LMAO
const KBD = " 1234567890-= qwertyuiop[] asdfghjkl;'` \\zxcvbnm,./ "
# 8259 PIC
fn pic_remap() do
outb(0x20, 0x11) outb(0xa0, 0x11)
outb(0x21, 0x20) outb(0xa1, 0x28)
outb(0x21, 0x04) outb(0xa1, 0x02)
outb(0x21, 0x01) outb(0xa1, 0x01)
outb(0x21, 0xff) outb(0xa1, 0xff)
end
fn pic_unmask(line) outb(0x21, inb(0x21) band (255 bxor (1 shl line)))
# this is just a simple prompt to test that shit is working
fn cmd_help() puts("commands: help, clear, bars, echo <text>, time\n")
fn cmd_clear() do
fill_rect(0, 0, fb_width(), fb_height(), CON_BG)
con.col = 0
con.row = 0
end
fn cmd_bars() do
const bars = { 0xff5555, 0xffaa00, 0xffff55, 0x55ff55, 0x55ffff, 0x5599ff, 0xaa55ff, 0xffffff }
const bw = fb_width() / 8
for i in 0..8 do fill_rect(i * bw, 0, bw, 40, bars[i]) end
puts("painted 8 bars from revo\n")
end
fn bcd(b) (b shr 4) * 10 + (b band 15)
fn rtc(reg) do
outb(0x70, reg)
inb(0x71)
end
fn cmd_time() puts("utc " ~ bcd(rtc(4)) ~ ":" ~ bcd(rtc(2)) ~ ":" ~ bcd(rtc(0)) ~ "\n")
fn run(line) do
const words = line:split(" ")
const cmd = words[0]
if cmd == "help" do cmd_help() end
else if cmd == "clear" do cmd_clear() end
else if cmd == "bars" do cmd_bars() end
else if cmd == "time" do cmd_time() end
else if cmd == "echo" do
if line:len() > 5 puts(line:sub(5, line:len() - 5) ~ "\n") else puts("\n")
end
else if line:len() == 0 do :nil end
else do puts("unknown command: " ~ cmd ~ "\n") end
puts("> ")
end
# she stroke my keys till i handle
# no fr this is just a key stroke handler
global sh = { line = "" }
global on_key = fn(code) do
if code >= 128 return :nil # key release
if code == 28 do # Enter
puts("\n")
run(sh.line)
sh.line = ""
return :nil
end
if code == 14 do # Backspace
if sh.line:len() > 0 do
sh.line = sh.line:sub(0, sh.line:len() - 1)
puts("\x08 \x08")
end
return :nil
end
if code < 2 return :nil
if code >= KBD:len() return :nil
const ch = KBD[code]
sh.line = sh.line ~ ch
puts(ch)
end
# kmain
pic_remap()
pic_unmask(1)
cmd_clear()
puts("revel shell, live in revo. type `help`\n> ")
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