diff options
| author | Tobias Diedrich <ranma+coreboot@tdiedrich.de> | 2010-11-09 22:31:11 +0000 |
|---|---|---|
| committer | Rudolf Marek <r.marek@assembler.cz> | 2010-11-09 22:31:11 +0000 |
| commit | c29246739af6faa56ceba4e912968464cbc9f4de (patch) | |
| tree | 4d9e9c6615caf476373ebca55b71d0257900d99c /src/cpu/amd/mtrr/amd_mtrr.c | |
| parent | 8b3cac2a6c8790abda72e386ed60dea39f322a54 (diff) | |
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
Diffstat (limited to 'src/cpu/amd/mtrr/amd_mtrr.c')
| -rw-r--r-- | src/cpu/amd/mtrr/amd_mtrr.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/src/cpu/amd/mtrr/amd_mtrr.c b/src/cpu/amd/mtrr/amd_mtrr.c index c113f3f8fa..26f4cbe80a 100644 --- a/src/cpu/amd/mtrr/amd_mtrr.c +++ b/src/cpu/amd/mtrr/amd_mtrr.c @@ -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. */ |