scripts/mod/file2alias.c

Source file repositories/reference/linux-study-clean/scripts/mod/file2alias.c

File Facts

System
Linux kernel
Corpus path
scripts/mod/file2alias.c
Extension
.c
Size
46912 bytes
Lines
1585
Domain
Support Tooling And Documentation
Bucket
scripts
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct devtable {
	const char *device_id;
	unsigned long id_size;
	void (*do_entry)(struct module *mod, void *symval);
};

/* Define a variable f that holds the value of field f of struct devid
 * based at address m.
 */
#define DEF_FIELD(m, devid, f) \
	typeof(((struct devid *)0)->f) f = \
		get_unaligned_native((typeof(f) *)((m) + OFF_##devid##_##f))

/* Define a variable f that holds the address of field f of struct devid
 * based at address m.  Due to the way typeof works, for a field of type
 * T[N] the variable has type T(*)[N], _not_ T*.
 */
#define DEF_FIELD_ADDR(m, devid, f) \
	typeof(((struct devid *)0)->f) *f = ((m) + OFF_##devid##_##f)

#define ADD(str, sep, cond, field)                              \
do {                                                            \
        strcat(str, sep);                                       \
        if (cond)                                               \
                sprintf(str + strlen(str),                      \
                        sizeof(field) == 1 ? "%02X" :           \
                        sizeof(field) == 2 ? "%04X" :           \
                        sizeof(field) == 4 ? "%08X" : "",       \
                        field);                                 \
        else                                                    \
                sprintf(str + strlen(str), "*");                \
} while(0)

static inline void add_uuid(char *str, uuid_le uuid)
{
	int len = strlen(str);

	sprintf(str + len, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
		uuid.b[3], uuid.b[2], uuid.b[1], uuid.b[0],
		uuid.b[5], uuid.b[4], uuid.b[7], uuid.b[6],
		uuid.b[8], uuid.b[9], uuid.b[10], uuid.b[11],
		uuid.b[12], uuid.b[13], uuid.b[14], uuid.b[15]);
}

static inline void add_guid(char *str, guid_t guid)
{
	int len = strlen(str);

	sprintf(str + len, "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
		guid.b[3], guid.b[2], guid.b[1], guid.b[0],
		guid.b[5], guid.b[4], guid.b[7], guid.b[6],
		guid.b[8], guid.b[9], guid.b[10], guid.b[11],
		guid.b[12], guid.b[13], guid.b[14], guid.b[15]);
}

/* USB is special because the bcdDevice can be matched against a numeric range */
/* Looks like "usb:vNpNdNdcNdscNdpNicNiscNipNinN" */
static void do_usb_entry(void *symval,
			 unsigned int bcdDevice_initial, int bcdDevice_initial_digits,
			 unsigned char range_lo, unsigned char range_hi,
			 unsigned char max, struct module *mod)
{
	char alias[500];
	DEF_FIELD(symval, usb_device_id, match_flags);
	DEF_FIELD(symval, usb_device_id, idVendor);
	DEF_FIELD(symval, usb_device_id, idProduct);
	DEF_FIELD(symval, usb_device_id, bcdDevice_lo);
	DEF_FIELD(symval, usb_device_id, bDeviceClass);
	DEF_FIELD(symval, usb_device_id, bDeviceSubClass);
	DEF_FIELD(symval, usb_device_id, bDeviceProtocol);
	DEF_FIELD(symval, usb_device_id, bInterfaceClass);
	DEF_FIELD(symval, usb_device_id, bInterfaceSubClass);
	DEF_FIELD(symval, usb_device_id, bInterfaceProtocol);
	DEF_FIELD(symval, usb_device_id, bInterfaceNumber);

	strcpy(alias, "usb:");
	ADD(alias, "v", match_flags&USB_DEVICE_ID_MATCH_VENDOR,
	    idVendor);
	ADD(alias, "p", match_flags&USB_DEVICE_ID_MATCH_PRODUCT,
	    idProduct);

	strcat(alias, "d");
	if (bcdDevice_initial_digits)
		sprintf(alias + strlen(alias), "%0*X",
			bcdDevice_initial_digits, bcdDevice_initial);
	if (range_lo == range_hi)
		sprintf(alias + strlen(alias), "%X", range_lo);
	else if (range_lo > 0 || range_hi < max) {
		if (range_lo > 0x9 || range_hi < 0xA)
			sprintf(alias + strlen(alias),

Annotation

Implementation Notes