Method read_doubleword

crates/virtual-machine/src/bus.rs:299–302

(&mut self, addr: u64)

            a if a >= PLIC_BASE && a <= PLIC_END => Some((&mut self.plic, addr - PLIC_BASE)),
            a if a >= FB_BASE && a <= FB_END => Some((&mut self.framebuffer, addr - FB_BASE)),
            a if a >= KBD_BASE && a <= KBD_END => Some((&mut self.keyboard, addr - KBD_BASE)),
            a if a >= ROM_BASE && a <= ROM_END => Some((&mut self.rom, addr)),
            _ => {
                // Route all RAM accesses through L1 cache (which cascades to L2, L3, then RAM)
                Some((&mut self.l1_cache, addr))
            }
        }