cpuid_check: add the multi-bits output value check function

Add the multi-bits output value check function, for example:
./cpuid_check  1 0 0 0 a 4:7 5

Suggested-by: Xudong Hao <xudong.hao@intel.com>
Signed-off-by: Pengfei Xu <pengfei.xu@intel.com>

Author: Pengfei Xu

BM/tools/cpuid_check/cpuid_check.c

@@ -23,6 +23,9 @@ int usage(char *progname)
 	printf("  CHAR5: a|b|c|d indicates the output matching EAX|EBX|ECX|EDX\n");
 	printf("  NUM6: number of decimal digits in CHAR5 output register matching SPEC\n");
 	printf("CET SHSTK cpuid check example:\n# %s 7 0 0 0 c 7\n", progname);
+	printf("Or STR6: 4:7  bit 4 to 7, start from 0, right to left\n");
+	printf("Or NUM7: num in decimal. Check num should be same as value of above bit 4:7\n");
+	printf("Or sample:# %s 1 0 0 0 a 4:7 5\n", progname);
 	exit(2);
 }
 
@@ -58,7 +61,7 @@ int h_to_b(long n)
 	return 0;
 }
 
-/* Check that the cpuid target output bits are correct. */
+/* Check that the cpuid target output of multi-bits are correct. */
 int check_id(long n, int ex_number)
 {
 	int i = 0;
@@ -81,11 +84,19 @@ int check_id(long n, int ex_number)
 	return 0;
 }
 
+unsigned int extract_bits(unsigned int num, int start, int end)
+{
+	unsigned int mask = 0;
+
+	mask = ((1 << (end - start + 1)) - 1) << start;
+	return (num & mask) >> start;
+}
+
 int main(int argc, char *argv[])
 {
-	unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0;
-	int ex_n, test_result = 1;
-	char ex = 'e';
+	unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0, result_num = 0;
+	int ex_n, test_result = 1, start = 0, end = 0, extract_bits_num = 0;
+	char ex = 'e', n_bits[7];
 
 	if (argc == 1) {
 		usage(argv[0]);
@@ -114,6 +125,45 @@ int main(int argc, char *argv[])
 			usage(argv[0]);
 		if (sscanf(argv[6], "%d", &ex_n) != 1)
 			usage(argv[0]);
+	} else if (argc == 8) {
+		if (sscanf(argv[1], "%x", &eax) != 1)
+			usage(argv[0]);
+
+		if (sscanf(argv[2], "%x", &ebx) != 1)
+			usage(argv[0]);
+		if (sscanf(argv[3], "%x", &ecx) != 1)
+			usage(argv[0]);
+		if (sscanf(argv[4], "%x", &edx) != 1)
+			usage(argv[0]);
+		if (sscanf(argv[5], "%c", &ex) != 1)
+			usage(argv[0]);
+
+		memset(n_bits, 0, sizeof(n_bits));
+		if (sscanf(argv[6], "%6s", &n_bits) != 1)
+			usage(argv[0]);
+
+		printf("7 parameters: Check CPUID.(EAX=%dH, ECX=%dH):e%cx[bit %s]\n",
+		       eax, ecx, ex, n_bits);
+
+		/*
+		 * Check if n_bits contains ":", like bit 4:7
+		 */
+		if (!strchr(n_bits, ':')) {
+			fprintf(stderr, "Error: n_bits must contain ':' char like 4:7\n");
+			usage(argv[0]);
+		}
+
+		if (sscanf(n_bits, "%d:%d", &start, &end) != 2) {
+			fprintf(stderr, "Invalid bit range format. Expected format: 4:7\n");
+			usage(argv[0]);
+		} else if (start > end) {
+			printf("start bit:%d should equal or less than end:%d\n",
+			       start, end);
+			usage(argv[0]);
+		}
+
+		if (sscanf(argv[7], "%d", &ex_n) != 1)
+			usage(argv[0]);
 	} else {
 		if (sscanf(argv[1], "%x", &eax) != 1)
 			usage(argv[0]);
@@ -140,18 +190,34 @@ int main(int argc, char *argv[])
 	printf("  edx=%08x    || Binary: ", edx);
 	h_to_b(edx);
 
-	printf("Now check cpuid e%cx, bit %d\n", ex, ex_n);
 	if (ex == 'a') {
-		test_result = check_id(eax, ex_n);
+		result_num = eax;
 	} else if (ex == 'b') {
-		test_result = check_id(ebx, ex_n);
+		result_num = ebx;
 	} else if (ex == 'c') {
-		test_result = check_id(ecx, ex_n);
+		result_num = ecx;
 	} else if (ex == 'd') {
-		test_result = check_id(edx, ex_n);
+		result_num = edx;
+	} else {
+		printf("No check point, not in a-d, skip. Return 0.\n");
+		return test_result;
+	}
+
+	if (strchr(n_bits, ':')) {
+		printf("Now check cpuid e%cx, bit %d:%d\n", ex, start, end);
+		extract_bits_num = extract_bits(result_num, start, end);
+		if (extract_bits_num == ex_n) {
+			printf("CPUID output: e%cx[bit %d:%d]:%d == %d, pass.\n",
+			       ex, start, end, extract_bits_num, ex_n);
+			test_result = 0;
+		} else {
+			printf("CPUID output: e%cx[bit %d:%d]:%d != %d, fail.\n",
+			       ex, start, end, extract_bits_num, ex_n);
+			test_result = 1;
+		}
 	} else {
-		printf("No check point, not in a-d, skip.\n");
-		test_result = 0;
+		printf("Now check cpuid e%cx, bit %d\n", ex, ex_n);
+		test_result = check_id(result_num, ex_n);
 	}
 
 	printf("Done! Return:%d.\n\n", test_result);