summaryrefslogtreecommitdiff
path: root/src/cpu/amd/mtrr
diff options
context:
space:
mode:
Diffstat (limited to 'src/cpu/amd/mtrr')
-rw-r--r--src/cpu/amd/mtrr/amd_mtrr.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/src/cpu/amd/mtrr/amd_mtrr.c b/src/cpu/amd/mtrr/amd_mtrr.c
index 6c0ead25ba..106cb7949d 100644
--- a/src/cpu/amd/mtrr/amd_mtrr.c
+++ b/src/cpu/amd/mtrr/amd_mtrr.c
@@ -103,9 +103,12 @@ void amd_setup_mtrrs(void)
const int cpu_id = cpuid_eax(0x80000001);
printk(BIOS_SPEW, "CPU ID 0x80000001: %x\n", cpu_id);
const int has_tom2wb =
- (((cpu_id>>20 )&0xf) > 0) || // ExtendedFamily > 0
- ((((cpu_id>>8 )&0xf) == 0xf) && // Family == 0F
- (((cpu_id>>16)&0xf) >= 0x4)); // Rev>=F deduced from rev tables
+ // ExtendedFamily > 0
+ (((cpu_id>>20)&0xf) > 0) ||
+ // Family == 0F
+ ((((cpu_id>>8)&0xf) == 0xf) &&
+ // Rev>=F deduced from rev tables
+ (((cpu_id>>16)&0xf) >= 0x4));
if (has_tom2wb)
printk(BIOS_DEBUG, "CPU is Fam 0Fh rev.F or later. We can use TOM2WB for any memory above 4GB\n");
@@ -135,9 +138,8 @@ void amd_setup_mtrrs(void)
* undefined side effects.
*/
msr.lo = msr.hi = 0;
- for (i = IORR_FIRST; i <= IORR_LAST; i++) {
+ for (i = IORR_FIRST; i <= IORR_LAST; i++)
wrmsr(i, msr);
- }
/* Enable Variable Mtrrs
* Enable the RdMem and WrMem bits in the fixed mtrrs.
@@ -151,12 +153,12 @@ void amd_setup_mtrrs(void)
enable_cache();
- address_bits = CONFIG_CPU_ADDR_BITS; //K8 could be 40, and GH could be 48
+ //K8 could be 40, and GH could be 48
+ address_bits = CONFIG_CPU_ADDR_BITS;
/* AMD specific cpuid function to query number of address bits */
- if (cpuid_eax(0x80000000) >= 0x80000008) {
+ if (cpuid_eax(0x80000000) >= 0x80000008)
address_bits = cpuid_eax(0x80000008) & 0xff;
- }
/* Now that I have mapped what is memory and what is not
* Set up the mtrrs so we can cache the memory.