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This fixes a FIXME in src/cpu/amd/mtrr/amd_mtrr.c and shuts up the 

Linux kernel, which was previously complaining that the MTRR setup
is wrong, if the cpu supports more than CONFIG_CPU_ADDR_BITS bits of
address space.

Shamelessly copied from Linux arch/x86/kernel/cpu/mtrr/main.c

Signed-off-by: Tobias Diedrich <ranma+coreboot@tdiedrich.de>
Acked-by: Scott Duplichan <scott@notabs.org>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6052 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Tobias Diedrich 2010-11-09 22:31:11 +00:00 committed by Rudolf Marek
parent 8b3cac2a6c
commit c29246739a
1 changed files with 6 additions and 3 deletions
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9
src/cpu/amd/mtrr/amd_mtrr.c
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@ -1,5 +1,6 @@
#include <console/console.h>
#include <device/device.h>
#include <arch/cpu.h>
#include <cpu/x86/mtrr.h>
#include <cpu/amd/mtrr.h>
#include <cpu/x86/cache.h>
@ -175,11 +176,13 @@ void amd_setup_mtrrs(void)
enable_cache();
/* FIXME we should probably query the cpu for this
* but so far this is all any recent AMD cpu has supported.
*/
address_bits = CONFIG_CPU_ADDR_BITS; //K8 could be 40, and GH could be 48
/* AMD specific cpuid function to query number of address bits */
if (cpuid_eax(0x80000000) >= 0x80000008) {
address_bits = cpuid_eax(0x80000008) & 0xff;
}
/* Now that I have mapped what is memory and what is not
* Setup the mtrrs so we can cache the memory.
*/