x86: cpu: Report address width from cpu_get_info()

Add support for this new field in the common code used by most x86 CPU
drivers.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/arch/x86/cpu/i386/cpu.c b/arch/x86/cpu/i386/cpu.c
index 8f342dd..7517b75 100644 (file)
--- a/arch/x86/cpu/i386/cpu.c
+++ b/arch/x86/cpu/i386/cpu.c
@@ -34,6 +34,10 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#define CPUID_FEATURE_PAE      BIT(6)
+#define CPUID_FEATURE_PSE36    BIT(17)
+#define CPUID_FEAURE_HTT       BIT(28)
+
 /*
  * Constructor for a conventional segment GDT (or LDT) entry
  * This is a macro so it can be used in initialisers
@@ -388,6 +392,25 @@ static void setup_identity(void)
        }
 }
 
+static uint cpu_cpuid_extended_level(void)
+{
+       return cpuid_eax(0x80000000);
+}
+
+int cpu_phys_address_size(void)
+{
+       if (!has_cpuid())
+               return 32;
+
+       if (cpu_cpuid_extended_level() >= 0x80000008)
+               return cpuid_eax(0x80000008) & 0xff;
+
+       if (cpuid_edx(1) & (CPUID_FEATURE_PAE | CPUID_FEATURE_PSE36))
+               return 36;
+
+       return 32;
+}
+
 /* Don't allow PCI region 3 to use memory in the 2-4GB memory hole */
 static void setup_pci_ram_top(void)
 {

diff --git a/arch/x86/cpu/intel_common/cpu.c b/arch/x86/cpu/intel_common/cpu.c
index d8a3d60..39aa0f6 100644 (file)
--- a/arch/x86/cpu/intel_common/cpu.c
+++ b/arch/x86/cpu/intel_common/cpu.c
@@ -127,6 +127,7 @@ int cpu_intel_get_info(struct cpu_info *info, int bclk)
        info->cpu_freq = ((msr.lo >> 8) & 0xff) * bclk * 1000000;
        info->features = 1 << CPU_FEAT_L1_CACHE | 1 << CPU_FEAT_MMU |
                1 << CPU_FEAT_UCODE | 1 << CPU_FEAT_DEVICE_ID;
+       info->address_width = cpu_phys_address_size();
 
        return 0;
 }

diff --git a/arch/x86/cpu/x86_64/cpu.c b/arch/x86/cpu/x86_64/cpu.c
index 1b4d397..90a766c 100644 (file)
--- a/arch/x86/cpu/x86_64/cpu.c
+++ b/arch/x86/cpu/x86_64/cpu.c
@@ -70,3 +70,8 @@ int x86_cpu_reinit_f(void)
 {
        return 0;
 }
+
+int cpu_phys_address_size(void)
+{
+       return CONFIG_CPU_ADDR_BITS;
+}

diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h
index 21a05da..5b001bb 100644 (file)
--- a/arch/x86/include/asm/cpu.h
+++ b/arch/x86/include/asm/cpu.h
@@ -288,4 +288,13 @@ u32 cpu_get_family_model(void);
  */
 u32 cpu_get_stepping(void);
 
+/**
+ * cpu_phys_address_size() - Get the physical address size in bits
+ *
+ * This is 32 for older CPUs but newer ones may support 36.
+ *
+ * @return address size (typically 32 or 36)
+ */
+int cpu_phys_address_size(void);
+
 #endif