From 79e8b41a4a17763ac8d2dffbe72504783d002ddc Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Thu, 7 Jan 2010 17:34:03 +0100
Subject: [PATCH] lscpu: add {32,64}-bit CPU modes detection

This patch add "CPU op-mode(s):" field that prints all supported CPU
operation modes. The field is based on CPU flags:

	rm (real mode)          16-bit
	tm (transparent mode)   32-bit
	lm (long mode)          64-bit

Example:

	$ lscpu
	Architecture:          x86_64
	CPU op-mode(s):        32-bit, 64-bit
	CPU(s):                2
	Thread(s) per core:    1
	Core(s) per socket:    2
	CPU socket(s):         1
	NUMA node(s):          1
	Vendor ID:             GenuineIntel
	CPU family:            6
	Model:                 15
	Stepping:              11
	CPU MHz:               1600.000
	Virtualization:        VT-x
	L1d cache:             32K
	L1i cache:             32K
	L2 cache:              4096K

Signed-off-by: Karel Zak <kzak@redhat.com>
---
 sys-utils/lscpu.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/sys-utils/lscpu.c b/sys-utils/lscpu.c
index 6b6082fb..c200fb32 100644
--- a/sys-utils/lscpu.c
+++ b/sys-utils/lscpu.c
@@ -80,6 +80,12 @@ const char *hv_vendors[] = {
 	[HYPER_MSHV]	= "Microsoft"
 };
 
+/* CPU modes (bits) */
+enum {
+	MODE_REAL	= (1 << 1),
+	MODE_TRANSPARENT = (1 << 2),
+	MODE_LONG	= (1 << 3)
+};
 
 /* CPU(s) description */
 struct cpu_desc {
@@ -108,6 +114,8 @@ struct cpu_desc {
 	char	*stepping;
 	char	*flags;
 
+	int	mode;		/* rm, lm or/and tm */
+
 	/* NUMA */
 	int	*nodecpu;
 };
@@ -285,6 +293,13 @@ read_basicinfo(struct cpu_desc *cpu)
 			cpu->virtflag = strdup("svm");
 		else if (strstr(buf, " vmx "))
 			cpu->virtflag = strdup("vmx");
+
+		if (strstr(buf, " rm "))
+			cpu->mode |= MODE_REAL;
+		if (strstr(buf, " tm "))
+			cpu->mode |= MODE_TRANSPARENT;
+		if (strstr(buf, " lm "))
+			cpu->mode |= MODE_LONG;
 	}
 
 	fclose(fp);
@@ -584,6 +599,26 @@ static void
 print_readable(struct cpu_desc *cpu)
 {
 	print_s("Architecture:", cpu->arch);
+
+	if (cpu->mode & (MODE_REAL | MODE_TRANSPARENT | MODE_LONG)) {
+		char buf[64], *p = buf;
+
+		if (cpu->mode & MODE_REAL) {
+			strcpy(p, "16-bit, ");
+			p += 8;
+		}
+		if (cpu->mode & MODE_TRANSPARENT) {
+			strcpy(p, "32-bit, ");
+			p += 8;
+		}
+		if (cpu->mode & MODE_LONG) {
+			strcpy(p, "64-bit, ");
+			p += 8;
+		}
+		*(p - 2) = '\0';
+		print_s(_("CPU op-mode(s):"), buf);
+	}
+
 	print_n("CPU(s):", cpu->ct_cpu);
 
 	if (have_topology) {
-- 
2.39.5