[thirdparty/util-linux.git] / sys-utils / lscpu-dmi.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2020 FUJITSU LIMITED.  All rights reserved.
 */

#include "lscpu.h"

void to_dmi_header(struct lscpu_dmi_header *h, uint8_t *data)
{
	h->type = data[0];
	h->length = data[1];
	memcpy(&h->handle, data + 2, sizeof(h->handle));
	h->data = data;
}

char *dmi_string(const struct lscpu_dmi_header *dm, uint8_t s)
{
	char *bp = (char *)dm->data;

	if (!s || !bp)
		return NULL;

	bp += dm->length;
	while (s > 1 && *bp) {
		bp += strlen(bp);
		bp++;
		s--;
	}

	return !*bp ? NULL : bp;
}

int parse_dmi_table(uint16_t len, uint16_t num,
				uint8_t *data,
				struct dmi_info *di)
{
	uint8_t *buf = data;
	int rc = -1;
	int i = 0;

	 /* 4 is the length of an SMBIOS structure header */
	while (i < num && data + 4 <= buf + len) {
		uint8_t *next;
		struct lscpu_dmi_header h;

		to_dmi_header(&h, data);

		/*
		 * If a short entry is found (less than 4 bytes), not only it
		 * is invalid, but we cannot reliably locate the next entry.
		 * Better stop at this point.
		 */
		if (h.length < 4)
			goto done;

		/* look for the next handle */
		next = data + h.length;
		while (next - buf + 1 < len && (next[0] != 0 || next[1] != 0))
			next++;
		next += 2;
		switch (h.type) {
		case 0:
			di->vendor = dmi_string(&h, data[0x04]);
			break;
		case 1:
			di->manufacturer = dmi_string(&h, data[0x04]);
			di->product = dmi_string(&h, data[0x05]);
			break;
		case 4:
			/* Get the first processor information */
			if (di->sockets == 0) {
				di->processor_manufacturer = dmi_string(&h, data[0x7]);
				di->processor_version = dmi_string(&h, data[0x10]);
				di->current_speed = *((uint16_t *)(&data[0x16]));
				di->part_num = dmi_string(&h, data[0x22]);
			}
			di->sockets++;
			break;
		default:
			break;
		}

		data = next;
		i++;
	}
	rc = 0;
done:
	return rc;
}

int dmi_decode_cputype(struct lscpu_cputype *ct)
{
	static char const sys_fw_dmi_tables[] = _PATH_SYS_DMI;
	struct dmi_info di = { };
	struct stat st;
	uint8_t *data;
	int rc = 0;
	char buf[100] = { };

	if (stat(sys_fw_dmi_tables, &st))
		return rc;

	data = get_mem_chunk(0, st.st_size, sys_fw_dmi_tables);
	if (!data)
		return rc;

	rc = parse_dmi_table(st.st_size, st.st_size/4, data, &di);
	if (rc < 0) {
		free(data);
		return rc;
	}

	ct->bios_vendor = xstrdup(di.processor_manufacturer);

	snprintf(buf, sizeof(buf),
			"%s %s CPU @ %d.%dGHz", di.processor_version, di.part_num,
			di.current_speed/1000, (di.current_speed % 1000) / 100);
	ct->bios_modelname = xstrdup(buf);

	free(data);
	return 0;
}

size_t get_number_of_physical_sockets_from_dmi(void)
{
	static char const sys_fw_dmi_tables[] = _PATH_SYS_DMI;
	struct dmi_info di;
	struct stat st;
	uint8_t *data;
	int rc = 0;

	if (stat(sys_fw_dmi_tables, &st))
		return rc;

	data = get_mem_chunk(0, st.st_size, sys_fw_dmi_tables);
	if (!data)
		return rc;

	memset(&di, 0, sizeof(struct dmi_info));
	rc = parse_dmi_table(st.st_size, st.st_size/4, data, &di);

	free(data);

	if ((rc < 0) || !di.sockets)
		return 0;
	else
		return di.sockets;
}
Commit	Line	Data
3cd676f5 MM	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Copyright (C) 2020 FUJITSU LIMITED. All rights reserved.
	4	*/
	5
	6	#include "lscpu.h"
	7
	8	void to_dmi_header(struct lscpu_dmi_header h, uint8_t data)
	9	{
	10	h->type = data[0];
	11	h->length = data[1];
	12	memcpy(&h->handle, data + 2, sizeof(h->handle));
	13	h->data = data;
	14	}
	15
	16	char dmi_string(const struct lscpu_dmi_header dm, uint8_t s)
	17	{
	18	char bp = (char )dm->data;
	19
	20	if (!s \|\| !bp)
	21	return NULL;
	22
	23	bp += dm->length;
	24	while (s > 1 && *bp) {
	25	bp += strlen(bp);
	26	bp++;
	27	s--;
	28	}
	29
	30	return !*bp ? NULL : bp;
	31	}
	32
	33	int parse_dmi_table(uint16_t len, uint16_t num,
	34	uint8_t *data,
	35	struct dmi_info *di)
	36	{
	37	uint8_t *buf = data;
	38	int rc = -1;
	39	int i = 0;
	40
	41	/* 4 is the length of an SMBIOS structure header */
	42	while (i < num && data + 4 <= buf + len) {
	43	uint8_t *next;
	44	struct lscpu_dmi_header h;
	45
	46	to_dmi_header(&h, data);
	47
	48	/*
	49	* If a short entry is found (less than 4 bytes), not only it
	50	* is invalid, but we cannot reliably locate the next entry.
	51	* Better stop at this point.
	52	*/
	53	if (h.length < 4)
	54	goto done;
	55
	56	/* look for the next handle */
	57	next = data + h.length;
	58	while (next - buf + 1 < len && (next[0] != 0 \|\| next[1] != 0))
	59	next++;
	60	next += 2;
	61	switch (h.type) {
	62	case 0:
	63	di->vendor = dmi_string(&h, data[0x04]);
	64	break;
65	case 1:
66	di->manufacturer = dmi_string(&h, data[0x04]);
67	di->product = dmi_string(&h, data[0x05]);
68	break;
788f90d6	69	case 4:
a772d7c4 HS	70	/* Get the first processor information */
	71	if (di->sockets == 0) {
	72	di->processor_manufacturer = dmi_string(&h, data[0x7]);
	73	di->processor_version = dmi_string(&h, data[0x10]);
	74	di->current_speed = ((uint16_t )(&data[0x16]));
	75	di->part_num = dmi_string(&h, data[0x22]);
	76	}
788f90d6 MM	77	di->sockets++;
788f90d6 MM	78	break;
3cd676f5 MM	79	default:
	80	break;
	81	}
	82
	83	data = next;
	84	i++;
	85	}
	86	rc = 0;
	87	done:
	88	return rc;
	89	}
788f90d6	90
a772d7c4 HS	91	int dmi_decode_cputype(struct lscpu_cputype *ct)
	92	{
	93	static char const sys_fw_dmi_tables[] = _PATH_SYS_DMI;
	94	struct dmi_info di = { };
	95	struct stat st;
	96	uint8_t *data;
	97	int rc = 0;
	98	char buf[100] = { };
	99
	100	if (stat(sys_fw_dmi_tables, &st))
	101	return rc;
	102
	103	data = get_mem_chunk(0, st.st_size, sys_fw_dmi_tables);
	104	if (!data)
	105	return rc;
	106
	107	rc = parse_dmi_table(st.st_size, st.st_size/4, data, &di);
	108	if (rc < 0) {
	109	free(data);
	110	return rc;
	111	}
	112
	113	ct->bios_vendor = xstrdup(di.processor_manufacturer);
	114
	115	snprintf(buf, sizeof(buf),
	116	"%s %s CPU @ %d.%dGHz", di.processor_version, di.part_num,
	117	di.current_speed/1000, (di.current_speed % 1000) / 100);
	118	ct->bios_modelname = xstrdup(buf);
	119
	120	free(data);
	121	return 0;
	122	}
	123
788f90d6 MM	124	size_t get_number_of_physical_sockets_from_dmi(void)
	125	{
	126	static char const sys_fw_dmi_tables[] = _PATH_SYS_DMI;
	127	struct dmi_info di;
	128	struct stat st;
	129	uint8_t *data;
	130	int rc = 0;
	131
	132	if (stat(sys_fw_dmi_tables, &st))
	133	return rc;
	134
	135	data = get_mem_chunk(0, st.st_size, sys_fw_dmi_tables);
	136	if (!data)
	137	return rc;
	138
	139	memset(&di, 0, sizeof(struct dmi_info));
	140	rc = parse_dmi_table(st.st_size, st.st_size/4, data, &di);
	141
	142	free(data);
	143
	144	if ((rc < 0) \|\| !di.sockets)
	145	return 0;
	146	else
	147	return di.sockets;
	148	}