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chore: use stdlib endian-aware integer read/write functions

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-06-03 12:18:28 -03:00
parent deff74d804
commit 2dc3864dca
8 changed files with 29 additions and 128 deletions
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16
src/bus/Iwram.zig
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@@ -25,9 +25,7 @@ pub fn read(self: *const Self, comptime T: type, address: usize) T {
const addr = address & 0x7FFF;
return switch (T) {
u32 => (@as(u32, self.buf[addr + 3]) << 24) | (@as(u32, self.buf[addr + 2]) << 16) | (@as(u32, self.buf[addr + 1]) << 8) | (@as(u32, self.buf[addr])),
u16 => (@as(u16, self.buf[addr + 1]) << 8) | @as(u16, self.buf[addr]),
u8 => self.buf[addr],
u32, u16, u8 => std.mem.readIntSliceLittle(T, self.buf[addr..][0..@sizeOf(T)]),
else => @compileError("IWRAM: Unsupported read width"),
};
}
@@ -36,17 +34,7 @@ pub fn write(self: *const Self, comptime T: type, address: usize, value: T) void
const addr = address & 0x7FFF;
return switch (T) {
u32 => {
self.buf[addr + 3] = @truncate(u8, value >> 24);
self.buf[addr + 2] = @truncate(u8, value >> 16);
self.buf[addr + 1] = @truncate(u8, value >> 8);
self.buf[addr + 0] = @truncate(u8, value >> 0);
},
u16 => {
self.buf[addr + 1] = @truncate(u8, value >> 8);
self.buf[addr + 0] = @truncate(u8, value >> 0);
},
u8 => self.buf[addr] = value,
u32, u16, u8 => std.mem.writeIntSliceLittle(T, self.buf[addr..][0..@sizeOf(T)], value),
else => @compileError("IWRAM: Unsupported write width"),
};
}