feat: load + run native ELF binaries

7 files changed, 333 insertions, 235 deletions

diff --git a/kernel/console.rv b/kernel/console.rv
new file mode 100644
index 0000000..a448ef9
--- /dev/null
+++ b/kernel/console.rv
@@ -0,0 +1,64 @@
+const FW = 8            # glyph width in pixels
+const FH = 16           # glyph height in pixels (8x16 VGA bitmap font)
+const FG = 0xd0d0d0
+const CON_BG = 0x101018
+
+global con = { col = 0, row = 0, scale = 1 }
+
+# cell size in pixels at the current zoom. named cell_* (not cw/ch) so they don't
+# collide with draw_glyph's `ch` character parameter.
+fn cell_w() FW * con.scale
+fn cell_h() FH * con.scale
+fn con_cols() fb_width() / cell_w()
+fn con_rows() fb_height() / cell_h()
+
+fn draw_glyph(col, row, ch) do
+  const x0 = col * cell_w()
+  const y0 = row * cell_h()
+  fill_rect(x0, y0, cell_w(), cell_h(), 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..FH do
+    const bits = g[fy]
+    for fx in 0..FW do
+      if (bits shr fx) band 1 == 1 fill_rect(x0 + fx * con.scale, y0 + fy * con.scale, con.scale, con.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(cell_h(), 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
+
+fn puts(s) serial_puts(s)
+
+global flush_console = fn() do
+  let c = serial_next()
+  while c >= 0 do
+    con_putc(string.of_ascii(c))
+    c = serial_next()
+  end
+end
diff --git a/kernel/font.rv b/kernel/font.rv
new file mode 100644
index 0000000..7bd7c6a
--- /dev/null
+++ b/kernel/font.rv
@@ -0,0 +1,102 @@
+# IBM VGA 8x16 font (from Linux lib/fonts/font_8x16.c)
+# ASCII 0x20..0x7f, indexed by (code - 32).
+# one byte per row, 16 rows.
+# bit 0 (LSB) of a byte is the leftmost pixel (VGA data is MSB-first, reversed here).
+global FONT = {
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, # space
+  { 0x00, 0x00, 0x18, 0x3C, 0x3C, 0x3C, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00 }, # !
+  { 0x00, 0x66, 0x66, 0x66, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, # "
+  { 0x00, 0x00, 0x00, 0x36, 0x36, 0x7F, 0x36, 0x36, 0x36, 0x7F, 0x36, 0x36, 0x00, 0x00, 0x00, 0x00 }, # #
+  { 0x18, 0x18, 0x3E, 0x63, 0x43, 0x03, 0x3E, 0x60, 0x60, 0x61, 0x63, 0x3E, 0x18, 0x18, 0x00, 0x00 }, # $
+  { 0x00, 0x00, 0x00, 0x00, 0x43, 0x63, 0x30, 0x18, 0x0C, 0x06, 0x63, 0x61, 0x00, 0x00, 0x00, 0x00 }, # %
+  { 0x00, 0x00, 0x1C, 0x36, 0x36, 0x1C, 0x6E, 0x3B, 0x33, 0x33, 0x33, 0x6E, 0x00, 0x00, 0x00, 0x00 }, # &
+  { 0x00, 0x0C, 0x0C, 0x0C, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, # '
+  { 0x00, 0x00, 0x30, 0x18, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00 }, # (
+  { 0x00, 0x00, 0x0C, 0x18, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x18, 0x0C, 0x00, 0x00, 0x00, 0x00 }, # )
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x66, 0x3C, 0xFF, 0x3C, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, # *
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x7E, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, # +
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x18, 0x0C, 0x00, 0x00, 0x00 }, # ,
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, # -
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00 }, # .
+  { 0x00, 0x00, 0x00, 0x00, 0x40, 0x60, 0x30, 0x18, 0x0C, 0x06, 0x03, 0x01, 0x00, 0x00, 0x00, 0x00 }, # /
+  { 0x00, 0x00, 0x1C, 0x36, 0x63, 0x63, 0x6B, 0x6B, 0x63, 0x63, 0x36, 0x1C, 0x00, 0x00, 0x00, 0x00 }, # 0
+  { 0x00, 0x00, 0x18, 0x1C, 0x1E, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x7E, 0x00, 0x00, 0x00, 0x00 }, # 1
+  { 0x00, 0x00, 0x3E, 0x63, 0x60, 0x30, 0x18, 0x0C, 0x06, 0x03, 0x63, 0x7F, 0x00, 0x00, 0x00, 0x00 }, # 2
+  { 0x00, 0x00, 0x3E, 0x63, 0x60, 0x60, 0x3C, 0x60, 0x60, 0x60, 0x63, 0x3E, 0x00, 0x00, 0x00, 0x00 }, # 3
+  { 0x00, 0x00, 0x30, 0x38, 0x3C, 0x36, 0x33, 0x7F, 0x30, 0x30, 0x30, 0x78, 0x00, 0x00, 0x00, 0x00 }, # 4
+  { 0x00, 0x00, 0x7F, 0x03, 0x03, 0x03, 0x3F, 0x60, 0x60, 0x60, 0x63, 0x3E, 0x00, 0x00, 0x00, 0x00 }, # 5
+  { 0x00, 0x00, 0x1C, 0x06, 0x03, 0x03, 0x3F, 0x63, 0x63, 0x63, 0x63, 0x3E, 0x00, 0x00, 0x00, 0x00 }, # 6
+  { 0x00, 0x00, 0x7F, 0x63, 0x60, 0x60, 0x30, 0x18, 0x0C, 0x0C, 0x0C, 0x0C, 0x00, 0x00, 0x00, 0x00 }, # 7
+  { 0x00, 0x00, 0x3E, 0x63, 0x63, 0x63, 0x3E, 0x63, 0x63, 0x63, 0x63, 0x3E, 0x00, 0x00, 0x00, 0x00 }, # 8
+  { 0x00, 0x00, 0x3E, 0x63, 0x63, 0x63, 0x7E, 0x60, 0x60, 0x60, 0x30, 0x1E, 0x00, 0x00, 0x00, 0x00 }, # 9
+  { 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00 }, # :
+  { 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x18, 0x18, 0x0C, 0x00, 0x00, 0x00, 0x00 }, # ;
+  { 0x00, 0x00, 0x00, 0x60, 0x30, 0x18, 0x0C, 0x06, 0x0C, 0x18, 0x30, 0x60, 0x00, 0x00, 0x00, 0x00 }, # <
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x7E, 0x00, 0x00, 0x7E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, # =
+  { 0x00, 0x00, 0x00, 0x06, 0x0C, 0x18, 0x30, 0x60, 0x30, 0x18, 0x0C, 0x06, 0x00, 0x00, 0x00, 0x00 }, # >
+  { 0x00, 0x00, 0x3E, 0x63, 0x63, 0x30, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00 }, # ?
+  { 0x00, 0x00, 0x00, 0x3E, 0x63, 0x63, 0x7B, 0x7B, 0x7B, 0x3B, 0x03, 0x3E, 0x00, 0x00, 0x00, 0x00 }, # @
+  { 0x00, 0x00, 0x08, 0x1C, 0x36, 0x63, 0x63, 0x7F, 0x63, 0x63, 0x63, 0x63, 0x00, 0x00, 0x00, 0x00 }, # A
+  { 0x00, 0x00, 0x3F, 0x66, 0x66, 0x66, 0x3E, 0x66, 0x66, 0x66, 0x66, 0x3F, 0x00, 0x00, 0x00, 0x00 }, # B
+  { 0x00, 0x00, 0x3C, 0x66, 0x43, 0x03, 0x03, 0x03, 0x03, 0x43, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00 }, # C
+  { 0x00, 0x00, 0x1F, 0x36, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x36, 0x1F, 0x00, 0x00, 0x00, 0x00 }, # D
+  { 0x00, 0x00, 0x7F, 0x66, 0x46, 0x16, 0x1E, 0x16, 0x06, 0x46, 0x66, 0x7F, 0x00, 0x00, 0x00, 0x00 }, # E
+  { 0x00, 0x00, 0x7F, 0x66, 0x46, 0x16, 0x1E, 0x16, 0x06, 0x06, 0x06, 0x0F, 0x00, 0x00, 0x00, 0x00 }, # F
+  { 0x00, 0x00, 0x3C, 0x66, 0x43, 0x03, 0x03, 0x7B, 0x63, 0x63, 0x66, 0x5C, 0x00, 0x00, 0x00, 0x00 }, # G
+  { 0x00, 0x00, 0x63, 0x63, 0x63, 0x63, 0x7F, 0x63, 0x63, 0x63, 0x63, 0x63, 0x00, 0x00, 0x00, 0x00 }, # H
+  { 0x00, 0x00, 0x3C, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, 0x00, 0x00, 0x00, 0x00 }, # I
+  { 0x00, 0x00, 0x78, 0x30, 0x30, 0x30, 0x30, 0x30, 0x33, 0x33, 0x33, 0x1E, 0x00, 0x00, 0x00, 0x00 }, # J
+  { 0x00, 0x00, 0x67, 0x66, 0x66, 0x36, 0x1E, 0x1E, 0x36, 0x66, 0x66, 0x67, 0x00, 0x00, 0x00, 0x00 }, # K
+  { 0x00, 0x00, 0x0F, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x46, 0x66, 0x7F, 0x00, 0x00, 0x00, 0x00 }, # L
+  { 0x00, 0x00, 0x63, 0x77, 0x7F, 0x7F, 0x6B, 0x63, 0x63, 0x63, 0x63, 0x63, 0x00, 0x00, 0x00, 0x00 }, # M
+  { 0x00, 0x00, 0x63, 0x67, 0x6F, 0x7F, 0x7B, 0x73, 0x63, 0x63, 0x63, 0x63, 0x00, 0x00, 0x00, 0x00 }, # N
+  { 0x00, 0x00, 0x3E, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x3E, 0x00, 0x00, 0x00, 0x00 }, # O
+  { 0x00, 0x00, 0x3F, 0x66, 0x66, 0x66, 0x3E, 0x06, 0x06, 0x06, 0x06, 0x0F, 0x00, 0x00, 0x00, 0x00 }, # P
+  { 0x00, 0x00, 0x3E, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x6B, 0x7B, 0x3E, 0x30, 0x70, 0x00, 0x00 }, # Q
+  { 0x00, 0x00, 0x3F, 0x66, 0x66, 0x66, 0x3E, 0x36, 0x66, 0x66, 0x66, 0x67, 0x00, 0x00, 0x00, 0x00 }, # R
+  { 0x00, 0x00, 0x3E, 0x63, 0x63, 0x06, 0x1C, 0x30, 0x60, 0x63, 0x63, 0x3E, 0x00, 0x00, 0x00, 0x00 }, # S
+  { 0x00, 0x00, 0x7E, 0x7E, 0x5A, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, 0x00, 0x00, 0x00, 0x00 }, # T
+  { 0x00, 0x00, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x3E, 0x00, 0x00, 0x00, 0x00 }, # U
+  { 0x00, 0x00, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x36, 0x1C, 0x08, 0x00, 0x00, 0x00, 0x00 }, # V
+  { 0x00, 0x00, 0x63, 0x63, 0x63, 0x63, 0x6B, 0x6B, 0x6B, 0x7F, 0x77, 0x36, 0x00, 0x00, 0x00, 0x00 }, # W
+  { 0x00, 0x00, 0x63, 0x63, 0x36, 0x3E, 0x1C, 0x1C, 0x3E, 0x36, 0x63, 0x63, 0x00, 0x00, 0x00, 0x00 }, # X
+  { 0x00, 0x00, 0x66, 0x66, 0x66, 0x66, 0x3C, 0x18, 0x18, 0x18, 0x18, 0x3C, 0x00, 0x00, 0x00, 0x00 }, # Y
+  { 0x00, 0x00, 0x7F, 0x63, 0x61, 0x30, 0x18, 0x0C, 0x06, 0x43, 0x63, 0x7F, 0x00, 0x00, 0x00, 0x00 }, # Z
+  { 0x00, 0x00, 0x3C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x3C, 0x00, 0x00, 0x00, 0x00 }, # [
+  { 0x00, 0x00, 0x00, 0x01, 0x03, 0x07, 0x0E, 0x1C, 0x38, 0x70, 0x60, 0x40, 0x00, 0x00, 0x00, 0x00 }, # \
+  { 0x00, 0x00, 0x3C, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x3C, 0x00, 0x00, 0x00, 0x00 }, # ]
+  { 0x08, 0x1C, 0x36, 0x63, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, # ^
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0x00, 0x00 }, # _
+  { 0x00, 0x0C, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, # `
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x1E, 0x30, 0x3E, 0x33, 0x33, 0x33, 0x6E, 0x00, 0x00, 0x00, 0x00 }, # a
+  { 0x00, 0x00, 0x07, 0x06, 0x06, 0x1E, 0x36, 0x66, 0x66, 0x66, 0x66, 0x3E, 0x00, 0x00, 0x00, 0x00 }, # b
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x3E, 0x63, 0x03, 0x03, 0x03, 0x63, 0x3E, 0x00, 0x00, 0x00, 0x00 }, # c
+  { 0x00, 0x00, 0x38, 0x30, 0x30, 0x3C, 0x36, 0x33, 0x33, 0x33, 0x33, 0x6E, 0x00, 0x00, 0x00, 0x00 }, # d
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x3E, 0x63, 0x7F, 0x03, 0x03, 0x63, 0x3E, 0x00, 0x00, 0x00, 0x00 }, # e
+  { 0x00, 0x00, 0x38, 0x6C, 0x4C, 0x0C, 0x1E, 0x0C, 0x0C, 0x0C, 0x0C, 0x1E, 0x00, 0x00, 0x00, 0x00 }, # f
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x6E, 0x33, 0x33, 0x33, 0x33, 0x33, 0x3E, 0x30, 0x33, 0x1E, 0x00 }, # g
+  { 0x00, 0x00, 0x07, 0x06, 0x06, 0x36, 0x6E, 0x66, 0x66, 0x66, 0x66, 0x67, 0x00, 0x00, 0x00, 0x00 }, # h
+  { 0x00, 0x00, 0x18, 0x18, 0x00, 0x1C, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, 0x00, 0x00, 0x00, 0x00 }, # i
+  { 0x00, 0x00, 0x60, 0x60, 0x00, 0x70, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x66, 0x66, 0x3C, 0x00 }, # j
+  { 0x00, 0x00, 0x07, 0x06, 0x06, 0x66, 0x36, 0x1E, 0x1E, 0x36, 0x66, 0x67, 0x00, 0x00, 0x00, 0x00 }, # k
+  { 0x00, 0x00, 0x1C, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, 0x00, 0x00, 0x00, 0x00 }, # l
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x37, 0x7F, 0x6B, 0x6B, 0x6B, 0x6B, 0x63, 0x00, 0x00, 0x00, 0x00 }, # m
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x3B, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00 }, # n
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x3E, 0x63, 0x63, 0x63, 0x63, 0x63, 0x3E, 0x00, 0x00, 0x00, 0x00 }, # o
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x3B, 0x66, 0x66, 0x66, 0x66, 0x66, 0x3E, 0x06, 0x06, 0x0F, 0x00 }, # p
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x6E, 0x33, 0x33, 0x33, 0x33, 0x33, 0x3E, 0x30, 0x30, 0x78, 0x00 }, # q
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x3B, 0x6E, 0x66, 0x06, 0x06, 0x06, 0x0F, 0x00, 0x00, 0x00, 0x00 }, # r
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x3E, 0x63, 0x06, 0x1C, 0x30, 0x63, 0x3E, 0x00, 0x00, 0x00, 0x00 }, # s
+  { 0x00, 0x00, 0x08, 0x0C, 0x0C, 0x3F, 0x0C, 0x0C, 0x0C, 0x0C, 0x6C, 0x38, 0x00, 0x00, 0x00, 0x00 }, # t
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x6E, 0x00, 0x00, 0x00, 0x00 }, # u
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x63, 0x63, 0x63, 0x63, 0x63, 0x36, 0x1C, 0x00, 0x00, 0x00, 0x00 }, # v
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x63, 0x63, 0x6B, 0x6B, 0x6B, 0x7F, 0x36, 0x00, 0x00, 0x00, 0x00 }, # w
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x63, 0x36, 0x1C, 0x1C, 0x1C, 0x36, 0x63, 0x00, 0x00, 0x00, 0x00 }, # x
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x7E, 0x60, 0x30, 0x1F, 0x00 }, # y
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x7F, 0x33, 0x18, 0x0C, 0x06, 0x63, 0x7F, 0x00, 0x00, 0x00, 0x00 }, # z
+  { 0x00, 0x00, 0x70, 0x18, 0x18, 0x18, 0x0E, 0x18, 0x18, 0x18, 0x18, 0x70, 0x00, 0x00, 0x00, 0x00 }, # {
+  { 0x00, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00 }, # |
+  { 0x00, 0x00, 0x0E, 0x18, 0x18, 0x18, 0x70, 0x18, 0x18, 0x18, 0x18, 0x0E, 0x00, 0x00, 0x00, 0x00 }, # }
+  { 0x00, 0x6E, 0x3B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, # ~
+  { 0x00, 0x00, 0x00, 0x00, 0x08, 0x1C, 0x36, 0x63, 0x63, 0x63, 0x7F, 0x00, 0x00, 0x00, 0x00, 0x00 }, # 
+}
diff --git a/kernel/input.rv b/kernel/input.rv
new file mode 100644
index 0000000..33cf65d
--- /dev/null
+++ b/kernel/input.rv
@@ -0,0 +1,47 @@
+# keyboard scancode table
+# ts is NOT a good way to write a driver LMAO
+const KBD       = "  1234567890-=  qwertyuiop[]  asdfghjkl;'` \\zxcvbnm,./    "
+# same layout, shifted. index 42 (left shift) / 54 (right shift) stay blank.
+const KBD_SHIFT = "  !@#$%^&*()_+  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)))
+
+# she stroke my keys till i handle
+# no fr this is just a key stroke handler
+global sh = { line = "", shift = :false }
+global on_key = fn(code) do
+  # shift: 0x2a/0x36 press,
+  #        0xaa/0xb6 release
+  # index a blank cell and type a stray space.
+  if code == 0x2a do sh.shift = :true  return :nil end
+  if code == 0x36 do sh.shift = :true  return :nil end
+  if code == 0xaa do sh.shift = :false return :nil end
+  if code == 0xb6 do sh.shift = :false return :nil end
+  if code >= 128 return :nil # other key releases
+  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 = if sh.shift KBD_SHIFT[code] else KBD[code]
+  sh.line = sh.line ~ ch
+  puts(ch)
+end
diff --git a/kernel/main.rv b/kernel/main.rv
index 8fe3b81..d3f1b23 100644
--- a/kernel/main.rv
+++ b/kernel/main.rv
@@ -1,240 +1,6 @@
-# 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> ")
+flush_console()
diff --git a/kernel/proc.rv b/kernel/proc.rv
new file mode 100644
index 0000000..af6e8f7
--- /dev/null
+++ b/kernel/proc.rv
@@ -0,0 +1,40 @@
+# parse the embedded ELF (physical address from elf_phys()) and run it in ring 3
+
+const PT_LOAD = 1
+const PAGE_FLAGS = 6      # WRITE | USER
+
+fn cmd_run() do
+  const base = elf_phys()
+  if mem_read(base, 4) != 0x464c457f do
+    puts("run: not an ELF\n")
+    return :nil
+  end
+  const entry = mem_read(base + 24, 8)
+  const phoff = mem_read(base + 32, 8)
+  const phnum = mem_read(base + 56, 2)
+  const phentsize = mem_read(base + 54, 2)
+  const as = as_create()
+  for i in 0..phnum do
+    const ph = base + phoff + i * phentsize
+    if mem_read(ph, 4) == PT_LOAD do
+      const offset = mem_read(ph + 8, 8)
+      const vaddr = mem_read(ph + 16, 8)
+      const filesz = mem_read(ph + 32, 8)
+      const memsz = mem_read(ph + 40, 8)
+      let off = 0
+      while off < memsz do
+        const frame = frame_alloc()
+        mem_zero(frame, 4096)
+        if off < filesz do
+          const left = filesz - off
+          mem_copy(frame, base + offset + off, if left > 4096 4096 else left)
+        end
+        as_map(as, vaddr + off, frame, PAGE_FLAGS)
+        off = off + 4096
+      end
+    end
+  end
+  const stack_top = 0x7fff0000
+  as_map(as, stack_top - 4096, frame_alloc(), PAGE_FLAGS)
+  proc_run(as, entry, stack_top)
+end
diff --git a/kernel/shell.rv b/kernel/shell.rv
new file mode 100644
index 0000000..562f3c4
--- /dev/null
+++ b/kernel/shell.rv
@@ -0,0 +1,55 @@
+# this is just a simple prompt to test that shit is working
+fn cmd_help() puts("commands: help, clear, bars, echo <text>, time, run, zoom in|out\n")
+
+fn zoom_by(d) do
+  let s = con.scale + d
+  if s < 1 do s = 1 end
+  if s > 6 do s = 6 end
+  con.scale = s
+  cmd_clear()
+  puts("zoom " ~ s ~ "x\n")
+end
+
+fn cmd_zoom(words) do
+  const dir = if words:len() > 1 words[1] else ""
+  if dir == "in" do zoom_by(1) end
+  else if dir == "out" do zoom_by(-1) end
+  else do puts("usage: zoom in | zoom out\n") end
+end
+
+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 == "run" do cmd_run() end
+  else if cmd == "zoom" do cmd_zoom(words) 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
diff --git a/kernel/vmm.rv b/kernel/vmm.rv
new file mode 100644
index 0000000..d6673b3
--- /dev/null
+++ b/kernel/vmm.rv
@@ -0,0 +1,24 @@
+# build the 4-level page tables for one user page
+# everything here only writes small entries we construct, so it's f64-safe
+const PTE_ADDR = 0x000FFFFFFFFFF000
+
+fn pte_idx(virt, level) (virt shr (12 + 9 * level)) band 0x1ff
+
+# next-level table phys under entry `i` of table `tbl`, creating it if absent
+fn next_table(tbl, i) do
+  const slot = tbl + i * 8
+  const entry = mem_read(slot, 8)
+  if (entry band 1) != 0 return entry band PTE_ADDR
+  const frame = frame_alloc()
+  mem_zero(frame, 4096)
+  mem_write(slot, frame bor 7, 8) # present | write | user
+  frame
+end
+
+fn as_map(pml4, virt, phys, flags) do
+  const pdpt = next_table(pml4, pte_idx(virt, 3))
+  const pd = next_table(pdpt, pte_idx(virt, 2))
+  const pt = next_table(pd, pte_idx(virt, 1))
+  mem_write(pt + pte_idx(virt, 0) * 8, (phys band PTE_ADDR) bor flags bor 1, 8)
+  invlpg(virt)
+end