Alan Cox <[EMAIL PROTECTED]> wrote: > > Some are part of the CPU core and affect things like CPU core itself, CPU > > caches, MMU/TLB and exceptions/interrupts. Others are on-silicon devices > > such as the serial ports, the bus controller, the SDRAM controller. > > How are they addressed - as CPU registers or as memory/IO space ?
Well, they're all accessed as memory locations within a special range of addresses (all of 0xCxxxxxxx and 0xDxxxxxxx). This includes the magic CPU registers. This is hard coded by the CPU before the MMU gets its hands on the addresses, AFAIK. I also wondered what about the boot wrapper (the kernel decompressor): Is that permitted to use readb() and co? David - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
