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remove mmio wrapping

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not sure why I added this to begin with since it doesn't happen on hardware
This commit is contained in:
Matthew Berry 2022-04-22 18:53:04 -07:00
parent 9ce8710aca
commit b06c4f87ed
1 changed files with 3 additions and 19 deletions
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24
src/crab/gba/mmio.cr
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@ -20,7 +20,7 @@ module GBA
end
def [](index : Int) : Byte
io_addr = 0x0FFF_u16 & index
io_addr = 0xFFFFFF_u32 & index
if io_addr <= 0x05F
@gba.ppu.read_io io_addr
elsif io_addr <= 0xAF
@ -38,17 +38,13 @@ module GBA
@gba.interrupts.read_io io_addr
elsif 0x204 <= io_addr <= 0x205
(@waitcnt.value >> (8 * (io_addr & 1))).to_u8!
elsif not_used? io_addr
0xFF_u8 # todo what is returned here?
else
# todo: oob reads
puts "Unmapped MMIO read: #{hex_str index.to_u32}".colorize(:red)
0_u8
0_u8 # todo: oob reads
end
end
def []=(index : Int, value : Byte) : Nil
io_addr = 0x0FFF_u16 & index
io_addr = 0xFFFFFF_u32 & index
if io_addr <= 0x05F
@gba.ppu.write_io io_addr, value
elsif io_addr <= 0xAF
@ -73,19 +69,7 @@ module GBA
else
@gba.cpu.halted = true
end
elsif not_used? io_addr
else
puts "Unmapped MMIO write ~ addr:#{hex_str index.to_u32}, val:#{hex_str value}".colorize(:yellow)
end
end
def not_used?(io_addr : Int) : Bool
(0x0E0..0x0FF).includes?(io_addr) || (0x110..0x11F).includes?(io_addr) ||
(0x12C..0x12F).includes?(io_addr) || (0x138..0x13F).includes?(io_addr) ||
(0x142..0x14F).includes?(io_addr) || (0x15A..0x1FF).includes?(io_addr) ||
(0x206..0x207).includes?(io_addr) || (0x20A..0x2FF).includes?(io_addr) ||
(0x302..0x40F).includes?(io_addr) || (0x441..0x7FF).includes?(io_addr) ||
(0x804..0xFFFF).includes?(io_addr)
end
end
end
end