From c29246739af6faa56ceba4e912968464cbc9f4de Mon Sep 17 00:00:00 2001 From: Tobias Diedrich Date: Tue, 9 Nov 2010 22:31:11 +0000 Subject: 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 Acked-by: Scott Duplichan git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6052 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1 --- src/cpu/amd/mtrr/amd_mtrr.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'src/cpu/amd/mtrr/amd_mtrr.c') 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 #include +#include #include #include #include @@ -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. */ -- cgit v1.2.3