Hi, I'm trying to figure out how ACPI is implemented, I don't know if this list is the right one to ask but I'm sure there are kind people in this place that will help me in my quest :) I tried to look for resources but I couldn't find too many. I'm interested to know how ACPI works in the hardware level... so, after a lot of reading I left with these questions, any knowledge provided is greatly appreciated. By looking at /proc/irq and /proc/ioports I can see that ACPI is allocated with IRQ9 and I/O ports 0x400-0x42F. 1. How does exactly a hardware device generates an event? 2. How does the OS asks a device to change it's state? what *exactly* happens? I read that the BIOS supplies all the ACPI tables. 3. Are they are being built in compile time (this is what I understand from the FAQ at Intel's website)? 4. What happens If a new PCI device is being added to the system, how the DSDT is being updated? (If at all...) I saw a note about an ACPI Controller. 5. What exactly is the role of this controller? How it operates? And who 6. In general, I'm looking to find out what is the role (in respect to "talking with the hardware") of these entities: the driver, the device, the OS (including the CA)? Who reads/writes to the I/O ports. Who sets the IRQ? the controller? or is it the device itself? What happens exactly? I tried reading the ACPI spec, but it's 600+ pages that doesn't answer these questions... Thanks in advance, Eric. - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
