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cpu/amd: Always fetch CPU addr bits at runtime 

All supported AMD CPUs support getting the physical address size from cpuid so
there is no need for a Kconfig default value.

Change-Id: If6f9234e091f44a2a03012e7e14c380aefbe717e
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58686
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Arthur Heymans 2021-10-28 10:13:39 +02:00 committed by Patrick Georgi
parent 4c8c8442ab
commit 7e27202441
1 changed files with 2 additions and 9 deletions
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11
src/cpu/amd/mtrr/amd_mtrr.c
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@ -4,6 +4,7 @@
#include <console/console.h>
#include <device/device.h>
#include <arch/cpu.h>
#include <cpu/cpu.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/msr.h>
#include <cpu/amd/mtrr.h>
@ -85,7 +86,6 @@ void add_uma_resource_below_tolm(struct device *nb, int idx)
void amd_setup_mtrrs(void)
{
unsigned long address_bits;
unsigned long i;
msr_t msr, sys_cfg;
// Test if this CPU is a Fam 0Fh rev. F or later
@ -142,13 +142,6 @@ void amd_setup_mtrrs(void)
enable_cache();
//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)
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.
*/
@ -156,5 +149,5 @@ void amd_setup_mtrrs(void)
// Rev. F K8 supports has SYSCFG_MSR_TOM2WB and doesn't need
// variable MTRR to span memory above 4GB
// Lower revisions K8 need variable MTRR over 4GB
x86_setup_var_mtrrs(address_bits, has_tom2wb ? 0 : 1);
x86_setup_var_mtrrs(cpu_phys_address_size(), has_tom2wb ? 0 : 1);
}