amas4

Usage

Overview

The amas driver provides read access to the AMD memory map, which describes the location of physical memory.

One instance of this device is shared between all cores on a chip. This device is present on AMD processors of the 0Fh, 10h and 11h family.

The amas device can run in either interleaved mode or in non-interleaved mode. In interleaved mode, the physical memory addresses are rotated across each chip. amas sits between the CPU cores, the DRAM controller and the HyperTransport bus. When a CPU requests a memory page, amas decides if the request is serviced from memory local to the chip, in which case it normalizes the address and passes it on to the dram controller. If the request refers to memory present on a different chip, the request is forwarded to the correct chip using the hypertransport bus.

The amas device is configured by the BIOS and kernel startup routines. If multiple instances of this device are available, all should contain the same information.