Subversion Repositories HelenOS

/*

 *	The PCI Library -- ID to Name Translation

 *

 *	Copyright (c) 1997--2005 Martin Mares <mj@ucw.cz>

 *

 *	May 8, 2006 - Modified and ported to HelenOS by Jakub Jermar.

 *

 *	Can be freely distributed and used under the terms of the GNU GPL.

 */

#include <stdio.h>

#include <stdlib.h>

#include <stdarg.h>

#include <string.h>

#include <errno.h>

#include "internal.h"

#include "pci_ids.h"

struct id_entry {

	struct id_entry *next;

	u32 id12, id34;

	byte cat;

	byte name[1];

};

enum id_entry_type {

	ID_UNKNOWN,

	ID_VENDOR,

	ID_DEVICE,

	ID_SUBSYSTEM,

	ID_GEN_SUBSYSTEM,

	ID_CLASS,

	ID_SUBCLASS,

	ID_PROGIF

};

struct id_bucket {

	struct id_bucket *next;

	unsigned int full;

};

#define MAX_LINE 1024

#define BUCKET_SIZE 8192

#define HASH_SIZE 4099

#ifdef __GNUC__

#define BUCKET_ALIGNMENT __alignof__(struct id_bucket)

#else

union id_align {

	struct id_bucket *next;

	unsigned int full;

};

#define BUCKET_ALIGNMENT sizeof(union id_align)

#endif

#define BUCKET_ALIGN(n) ((n)+BUCKET_ALIGNMENT-(n)%BUCKET_ALIGNMENT)

static void *id_alloc(struct pci_access *a, unsigned int size)

{

	struct id_bucket *buck = a->current_id_bucket;

	unsigned int pos;

	if (!buck || buck->full + size > BUCKET_SIZE) {

		buck = pci_malloc(a, BUCKET_SIZE);

		buck->next = a->current_id_bucket;

		a->current_id_bucket = buck;

		buck->full = BUCKET_ALIGN(sizeof(struct id_bucket));

	}

	pos = buck->full;

	buck->full = BUCKET_ALIGN(buck->full + size);

	return (byte *) buck + pos;

}

static inline u32 id_pair(unsigned int x, unsigned int y)

{

	return ((x << 16) | y);

}

static inline unsigned int id_hash(int cat, u32 id12, u32 id34)

{

	unsigned int h;

	h = id12 ^ (id34 << 3) ^ (cat << 5);

	return h % HASH_SIZE;

}

static struct id_entry *id_lookup(struct pci_access *a, int cat, int id1,

				  int id2, int id3, int id4)

{

	struct id_entry *n;

	u32 id12 = id_pair(id1, id2);

	u32 id34 = id_pair(id3, id4);

	n = a->id_hash[id_hash(cat, id12, id34)];

	while (n && (n->id12 != id12 || n->id34 != id34 || n->cat != cat))

		n = n->next;

	return n;

}

static int id_insert(struct pci_access *a, int cat, int id1, int id2,

		     int id3, int id4, byte * text)

{

	u32 id12 = id_pair(id1, id2);

	u32 id34 = id_pair(id3, id4);

	unsigned int h = id_hash(cat, id12, id34);

	struct id_entry *n = a->id_hash[h];

	int len = str_size((char *) text);

	while (n && (n->id12 != id12 || n->id34 != id34 || n->cat != cat))

		n = n->next;

	if (n)

		return 1;

	n = id_alloc(a, sizeof(struct id_entry) + len);

	n->id12 = id12;

	n->id34 = id34;

	n->cat = cat;

	memcpy(n->name, text, len + 1);

	n->next = a->id_hash[h];

	a->id_hash[h] = n;

	return 0;

}

static int id_hex(byte * p, int cnt)

{

	int x = 0;

	while (cnt--) {

		x <<= 4;

		if (*p >= '0' && *p <= '9')

			x += (*p - '0');

		else if (*p >= 'a' && *p <= 'f')

			x += (*p - 'a' + 10);

		else if (*p >= 'A' && *p <= 'F')

			x += (*p - 'A' + 10);

		else

			return -1;

		p++;

	}

	return x;

}

static inline int id_white_p(int c)

{

	return (c == ' ') || (c == '\t');

}

static const char *id_parse_list(struct pci_access *a, int *lino)

{

	byte *line;

	byte *p;

	int id1 = 0, id2 = 0, id3 = 0, id4 = 0;

	int cat = -1;

	int nest;

	static const char parse_error[] = "Parse error";

	int i;

	*lino = 0;

	for (i = 0; i < sizeof(pci_ids) / sizeof(char *); i++) {

		line = (byte *) pci_ids[i];

		(*lino)++;

		p = line;

		while (*p)

			p++;

		if (p > line && (p[-1] == ' ' || p[-1] == '\t'))

			*--p = 0;

		p = line;

		while (id_white_p(*p))

			p++;

		if (!*p || *p == '#')

			continue;

		p = line;

		while (*p == '\t')

			p++;

		nest = p - line;

		if (!nest) {	/* Top-level entries */

			if (p[0] == 'C' && p[1] == ' ') {	/* Class block */

				if ((id1 = id_hex(p + 2, 2)) < 0 || !id_white_p(p[4]))

					return parse_error;

				cat = ID_CLASS;

				p += 5;

			} else if (p[0] == 'S' && p[1] == ' ') {	/* Generic subsystem block */

				if ((id1 = id_hex(p + 2, 4)) < 0 || p[6])

					return parse_error;

				if (!id_lookup(a, ID_VENDOR, id1, 0, 0, 0))

					return "Vendor does not exist";

				cat = ID_GEN_SUBSYSTEM;

				continue;

			} else if (p[0] >= 'A' && p[0] <= 'Z' && p[1] == ' ') {	/* Unrecognized block (RFU) */

				cat = ID_UNKNOWN;

				continue;

			} else {	/* Vendor ID */

				if ((id1 = id_hex(p, 4)) < 0 || !id_white_p(p[4]))

					return parse_error;

				cat = ID_VENDOR;

				p += 5;

			}

			id2 = id3 = id4 = 0;

		} else if (cat == ID_UNKNOWN)	/* Nested entries in RFU blocks are skipped */

			continue;

		else if (nest == 1)	/* Nesting level 1 */

			switch (cat) {

			case ID_VENDOR:

			case ID_DEVICE:

			case ID_SUBSYSTEM:

				if ((id2 = id_hex(p, 4)) < 0 || !id_white_p(p[4]))

					return parse_error;

				p += 5;

				cat = ID_DEVICE;

				id3 = id4 = 0;

				break;

			case ID_GEN_SUBSYSTEM:

				if ((id2 = id_hex(p, 4)) < 0 || !id_white_p(p[4]))

					return parse_error;

				p += 5;

				id3 = id4 = 0;

				break;

			case ID_CLASS:

			case ID_SUBCLASS:

			case ID_PROGIF:

				if ((id2 = id_hex(p, 2)) < 0 || !id_white_p(p[2]))

					return parse_error;

				p += 3;

				cat = ID_SUBCLASS;

				id3 = id4 = 0;

				break;

			default:

				return parse_error;

		} else if (nest == 2)	/* Nesting level 2 */

			switch (cat) {

			case ID_DEVICE:

			case ID_SUBSYSTEM:

				if ((id3 = id_hex(p, 4)) < 0 || !id_white_p(p[4])

				    || (id4 = id_hex(p + 5, 4)) < 0 || !id_white_p(p[9]))

					return parse_error;

				p += 10;

				cat = ID_SUBSYSTEM;

				break;

			case ID_CLASS:

			case ID_SUBCLASS:

			case ID_PROGIF:

				if ((id3 = id_hex(p, 2)) < 0 || !id_white_p(p[2]))

					return parse_error;

				p += 3;

				cat = ID_PROGIF;

				id4 = 0;

				break;

			default:

				return parse_error;

		} else		/* Nesting level 3 or more */

			return parse_error;

		while (id_white_p(*p))

			p++;

		if (!*p)

			return parse_error;

		if (id_insert(a, cat, id1, id2, id3, id4, p))

			return "Duplicate entry";

	}

	return NULL;

}

int pci_load_name_list(struct pci_access *a)

{

	int lino;

	const char *err;

	pci_free_name_list(a);

	a->id_hash = pci_malloc(a, sizeof(struct id_entry *) * HASH_SIZE);

	bzero(a->id_hash, sizeof(struct id_entry *) * HASH_SIZE);

	err = id_parse_list(a, &lino);

	if (err)

		a->error("%s at %s, element %d\n", err, "pci_ids.h", lino);

	return 1;

}

void pci_free_name_list(struct pci_access *a)

{

	pci_mfree(a->id_hash);

	a->id_hash = NULL;

	while (a->current_id_bucket) {

		struct id_bucket *buck = a->current_id_bucket;

		a->current_id_bucket = buck->next;

		pci_mfree(buck);

	}

}

static struct id_entry *id_lookup_subsys(struct pci_access *a, int iv,

					 int id, int isv, int isd)

{

	struct id_entry *d = NULL;

	if (iv > 0 && id > 0)	/* Per-device lookup */

		d = id_lookup(a, ID_SUBSYSTEM, iv, id, isv, isd);

	if (!d)			/* Generic lookup */

		d = id_lookup(a, ID_GEN_SUBSYSTEM, isv, isd, 0, 0);

	if (!d && iv == isv && id == isd)	/* Check for subsystem == device */

		d = id_lookup(a, ID_DEVICE, iv, id, 0, 0);

	return d;

}

char *pci_lookup_name(struct pci_access *a, char *buf, int size, int flags,

		      ...)

{

	va_list args;

	int num, res, synth;

	struct id_entry *v, *d, *cls, *pif;

	int iv, id, isv, isd, icls, ipif;

	va_start(args, flags);

	num = 0;

	if ((flags & PCI_LOOKUP_NUMERIC) || a->numeric_ids) {

		flags &= ~PCI_LOOKUP_NUMERIC;

		num = 1;

	} else if (!a->id_hash) {

		if (!pci_load_name_list(a))

			num = a->numeric_ids = 1;

	}

	if (flags & PCI_LOOKUP_NO_NUMBERS) {

		flags &= ~PCI_LOOKUP_NO_NUMBERS;

		synth = 0;

		if (num)

			return NULL;

	} else

		synth = 1;

	switch (flags) {

	case PCI_LOOKUP_VENDOR:

		iv = va_arg(args, int);

		if (num)

			res = snprintf(buf, size, "%04x", iv);

		else if (v = id_lookup(a, ID_VENDOR, iv, 0, 0, 0))

			return (char *) v->name;

		else

			res = snprintf(buf, size, "Unknown vendor %04x", iv);

		break;

	case PCI_LOOKUP_DEVICE:

		iv = va_arg(args, int);

		id = va_arg(args, int);

		if (num)

			res = snprintf(buf, size, "%04x", id);

		else if (d = id_lookup(a, ID_DEVICE, iv, id, 0, 0))

			return (char *) d->name;

		else if (synth)

			res = snprintf(buf, size, "Unknown device %04x", id);

		else

			return NULL;

		break;

	case PCI_LOOKUP_VENDOR | PCI_LOOKUP_DEVICE:

		iv = va_arg(args, int);

		id = va_arg(args, int);

		if (num)

			res = snprintf(buf, size, "%04x:%04x", iv, id);

		else {

			v = id_lookup(a, ID_VENDOR, iv, 0, 0, 0);

			d = id_lookup(a, ID_DEVICE, iv, id, 0, 0);

			if (v && d)

				res = snprintf(buf, size, "%s %s", v->name,

					     d->name);

			else if (!synth)

				return NULL;

			else if (!v)

				res = snprintf(buf, size, "Unknown device %04x:%04x", iv, id);

			else	/* !d */

				res = snprintf(buf, size, "%s Unknown device %04x", v->name, id);

		}

		break;

	case PCI_LOOKUP_SUBSYSTEM | PCI_LOOKUP_VENDOR:

		isv = va_arg(args, int);

		if (num)

			res = snprintf(buf, size, "%04x", isv);

		else if (v = id_lookup(a, ID_VENDOR, isv, 0, 0, 0))

			return (char *) v->name;

		else if (synth)

			res = snprintf(buf, size, "Unknown vendor %04x", isv);

		else

			return NULL;

		break;

	case PCI_LOOKUP_SUBSYSTEM | PCI_LOOKUP_DEVICE:

		iv = va_arg(args, int);

		id = va_arg(args, int);

		isv = va_arg(args, int);

		isd = va_arg(args, int);

		if (num)

			res = snprintf(buf, size, "%04x", isd);

		else if (d = id_lookup_subsys(a, iv, id, isv, isd))

			return (char *) d->name;

		else if (synth)

			res = snprintf(buf, size, "Unknown device %04x", isd);

		else

			return NULL;

		break;

	case PCI_LOOKUP_VENDOR | PCI_LOOKUP_DEVICE | PCI_LOOKUP_SUBSYSTEM:

		iv = va_arg(args, int);

		id = va_arg(args, int);

		isv = va_arg(args, int);

		isd = va_arg(args, int);

		if (num)

			res = snprintf(buf, size, "%04x:%04x", isv, isd);

		else {

			v = id_lookup(a, ID_VENDOR, isv, 0, 0, 0);

			d = id_lookup_subsys(a, iv, id, isv, isd);

			if (v && d)

				res = snprintf(buf, size, "%s %s", v->name, d->name);

			else if (!synth)

				return NULL;

			else if (!v)

				res = snprintf(buf, size, "Unknown device %04x:%04x", isv, isd);

			else	/* !d */

				res = snprintf(buf, size, "%s Unknown device %04x", v->name, isd);

		}

		break;

	case PCI_LOOKUP_CLASS:

		icls = va_arg(args, int);

		if (num)

			res = snprintf(buf, size, "%04x", icls);

		else if (cls = id_lookup(a, ID_SUBCLASS, icls >> 8, icls & 0xff, 0, 0))

			return (char *) cls->name;

		else if (cls = id_lookup(a, ID_CLASS, icls, 0, 0, 0))

			res = snprintf(buf, size, "%s [%04x]", cls->name, icls);

		else if (synth)

			res = snprintf(buf, size, "Class %04x", icls);

		else

			return NULL;

		break;

	case PCI_LOOKUP_PROGIF:

		icls = va_arg(args, int);

		ipif = va_arg(args, int);

		if (num)

			res = snprintf(buf, size, "%02x", ipif);

		else if (pif = id_lookup(a, ID_PROGIF, icls >> 8, icls & 0xff, ipif, 0))

			return (char *) pif->name;

		else if (icls == 0x0101 && !(ipif & 0x70)) {

			/* IDE controllers have complex prog-if semantics */

			res = snprintf(buf, size, "%s%s%s%s%s",

				       (ipif & 0x80) ? "Master " : "",

				       (ipif & 0x08) ? "SecP " : "",

				       (ipif & 0x04) ? "SecO " : "",

				       (ipif & 0x02) ? "PriP " : "",

				       (ipif & 0x01) ? "PriO " : "");

			if (res > 0 && res < size)

				buf[--res] = 0;

		} else if (synth)

			res = snprintf(buf, size, "ProgIf %02x", ipif);

		else

			return NULL;

		break;

	default:

		return "<pci_lookup_name: invalid request>";

	}

	if (res < 0 || res >= size)

		return "<pci_lookup_name: buffer too small>";

	else

		return buf;

}