[Verse 1] Deep beneath the user layer lies a bridge of C and steel Where silicon meets software in the kernel's spinning wheel Module init gets us started, cleanup when we're done Registration tables mapping every interrupt that comes [Chorus] Init, probe, remove, release Major minor device peace Kernel space is where we dance Hardware talks through our commands Copy from user, copy to Never trust what programs do Spinlocks guard our precious state Driver patterns never wait [Verse 2] Character streams and block devices need their own approach File operations structure tells the kernel how we coach Read and write and ioctl, each function has its place Memory mapping dangerous without the proper grace [Chorus] Init, probe, remove, release Major minor device peace Kernel space is where we dance Hardware talks through our commands Copy from user, copy to Never trust what programs do Spinlocks guard our precious state Driver patterns never wait [Bridge] Interrupts are knocking at our handler's careful door Bottom halves and work queues process what came before DMA coherent buffers keep the cache lines synchronized Atomic operations guarantee what gets surprised [Verse 3] Platform drivers bind through device tree declarations PCI discovers hardware through enumeration stations Registers get mapped with ioremap's virtual sight Barriers ensure our writes complete before the night [Chorus] Init, probe, remove, release Major minor device peace Kernel space is where we dance Hardware talks through our commands Copy from user, copy to Never trust what programs do Spinlocks guard our precious state Driver patterns never wait [Outro] From silicon to system calls Our module bridges all Kernel driver architect Hardware interface perfect
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