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efi_loader: flesh out device-path to text 

It needs to handle more device-path node types, and also multiple levels
of path hierarchy.  To simplify this, initially construct utf8 string to
a temporary buffer, and then allocate the real utf16 buffer that is
returned.  This should be mostly for debugging or at least not critical-
path so an extra copy won't hurt, and is saner than the alternative.

Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Rob Clark 2017-09-13 18:05:30 -04:00 committed by Alexander Graf
parent 9309a1b76c
commit adae4313cd
3 changed files with 183 additions and 65 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/efi_api.h
View File

@ -304,6 +304,7 @@ struct efi_device_path_vendor {
#define EFI_PNP_ID(ID) (u32)(((ID) << 16) | 0x41D0)
#define EISA_PNP_ID(ID) EFI_PNP_ID(ID)
#define EISA_PNP_NUM(ID) ((ID) >> 16)
struct efi_device_path_acpi_path {
struct efi_device_path dp;

2
include/efi_loader.h
View File

@ -80,6 +80,8 @@ extern struct efi_simple_input_interface efi_con_in;
extern const struct efi_console_control_protocol efi_console_control;
extern const struct efi_device_path_to_text_protocol efi_device_path_to_text;
uint16_t *efi_dp_str(struct efi_device_path *dp);
extern const efi_guid_t efi_guid_console_control;
extern const efi_guid_t efi_guid_device_path;
extern const efi_guid_t efi_guid_loaded_image;

245
lib/efi_loader/efi_device_path_to_text.c
View File

@ -15,82 +15,197 @@
const efi_guid_t efi_guid_device_path_to_text_protocol =
EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID;
static char *dp_unknown(char *s, struct efi_device_path *dp)
{
s += sprintf(s, "/UNKNOWN(%04x,%04x)", dp->type, dp->sub_type);
return s;
}
static char *dp_hardware(char *s, struct efi_device_path *dp)
{
switch (dp->sub_type) {
case DEVICE_PATH_SUB_TYPE_VENDOR: {
struct efi_device_path_vendor *vdp =
(struct efi_device_path_vendor *)dp;
s += sprintf(s, "/VenHw(%pUl)", &vdp->guid);
break;
}
default:
s = dp_unknown(s, dp);
break;
}
return s;
}
static char *dp_acpi(char *s, struct efi_device_path *dp)
{
switch (dp->sub_type) {
case DEVICE_PATH_SUB_TYPE_ACPI_DEVICE: {
struct efi_device_path_acpi_path *adp =
(struct efi_device_path_acpi_path *)dp;
s += sprintf(s, "/Acpi(PNP%04x", EISA_PNP_NUM(adp->hid));
if (adp->uid)
s += sprintf(s, ",%d", adp->uid);
s += sprintf(s, ")");
break;
}
default:
s = dp_unknown(s, dp);
break;
}
return s;
}
static char *dp_msging(char *s, struct efi_device_path *dp)
{
switch (dp->sub_type) {
case DEVICE_PATH_SUB_TYPE_MSG_USB: {
struct efi_device_path_usb *udp =
(struct efi_device_path_usb *)dp;
s += sprintf(s, "/Usb(0x%x,0x%x)", udp->parent_port_number,
udp->usb_interface);
break;
}
case DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR: {
struct efi_device_path_mac_addr *mdp =
(struct efi_device_path_mac_addr *)dp;
if (mdp->if_type != 0 && mdp->if_type != 1)
break;
s += sprintf(s, "/MAC(%02x%02x%02x%02x%02x%02x,0x%1x)",
mdp->mac.addr[0], mdp->mac.addr[1],
mdp->mac.addr[2], mdp->mac.addr[3],
mdp->mac.addr[4], mdp->mac.addr[5],
mdp->if_type);
break;
}
case DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS: {
struct efi_device_path_usb_class *ucdp =
(struct efi_device_path_usb_class *)dp;
s += sprintf(s, "/USBClass(%x,%x,%x,%x,%x)",
ucdp->vendor_id, ucdp->product_id,
ucdp->device_class, ucdp->device_subclass,
ucdp->device_protocol);
break;
}
case DEVICE_PATH_SUB_TYPE_MSG_SD:
case DEVICE_PATH_SUB_TYPE_MSG_MMC: {
const char *typename =
(dp->sub_type == DEVICE_PATH_SUB_TYPE_MSG_SD) ?
"SDCard" : "MMC";
struct efi_device_path_sd_mmc_path *sddp =
(struct efi_device_path_sd_mmc_path *)dp;
s += sprintf(s, "/%s(Slot%u)", typename, sddp->slot_number);
break;
}
default:
s = dp_unknown(s, dp);
break;
}
return s;
}
static char *dp_media(char *s, struct efi_device_path *dp)
{
switch (dp->sub_type) {
case DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH: {
struct efi_device_path_hard_drive_path *hddp =
(struct efi_device_path_hard_drive_path *)dp;
void *sig = hddp->partition_signature;
switch (hddp->signature_type) {
case SIG_TYPE_MBR:
s += sprintf(s, "/HD(Part%d,Sig%08x)",
hddp->partition_number,
*(uint32_t *)sig);
break;
case SIG_TYPE_GUID:
s += sprintf(s, "/HD(Part%d,Sig%pUl)",
hddp->partition_number, sig);
default:
s += sprintf(s, "/HD(Part%d,MBRType=%02x,SigType=%02x)",
hddp->partition_number, hddp->partmap_type,
hddp->signature_type);
}
break;
}
case DEVICE_PATH_SUB_TYPE_CDROM_PATH: {
struct efi_device_path_cdrom_path *cddp =
(struct efi_device_path_cdrom_path *)dp;
s += sprintf(s, "/CDROM(0x%x)", cddp->boot_entry);
break;
}
case DEVICE_PATH_SUB_TYPE_FILE_PATH: {
struct efi_device_path_file_path *fp =
(struct efi_device_path_file_path *)dp;
int slen = (dp->length - sizeof(*dp)) / 2;
s += sprintf(s, "/%-*ls", slen, fp->str);
break;
}
default:
s = dp_unknown(s, dp);
break;
}
return s;
}
static uint16_t *efi_convert_device_node_to_text(
struct efi_device_path *device_node,
struct efi_device_path *dp,
bool display_only,
bool allow_shortcuts)
{
unsigned long buffer_size;
unsigned long len;
efi_status_t r;
uint16_t *buffer = NULL;
int i;
char buf[512]; /* this ought be be big enough for worst case */
char *str = buf;
uint16_t *out;
switch (device_node->type) {
case DEVICE_PATH_TYPE_END:
while (dp) {
switch (dp->type) {
case DEVICE_PATH_TYPE_HARDWARE_DEVICE:
str = dp_hardware(str, dp);
break;
case DEVICE_PATH_TYPE_ACPI_DEVICE:
str = dp_acpi(str, dp);
break;
case DEVICE_PATH_TYPE_MESSAGING_DEVICE:
str = dp_msging(str, dp);
break;
case DEVICE_PATH_TYPE_MEDIA_DEVICE:
str = dp_media(str, dp);
break;
default:
str = dp_unknown(str, dp);
}
dp = efi_dp_next(dp);
}
*str++ = '\0';
len = str - buf;
r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, 2 * len, (void **)&out);
if (r != EFI_SUCCESS)
return NULL;
case DEVICE_PATH_TYPE_MESSAGING_DEVICE:
switch (device_node->sub_type) {
case DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR: {
struct efi_device_path_mac_addr *dp =
(struct efi_device_path_mac_addr *)device_node;
if (dp->if_type != 0 && dp->if_type != 1)
break;
r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
2 * MAC_OUTPUT_LEN,
(void **)&buffer);
if (r != EFI_SUCCESS)
return NULL;
sprintf((char *)buffer,
"MAC(%02x%02x%02x%02x%02x%02x,0x%1x)",
dp->mac.addr[0], dp->mac.addr[1],
dp->mac.addr[2], dp->mac.addr[3],
dp->mac.addr[4], dp->mac.addr[5],
dp->if_type);
for (i = MAC_OUTPUT_LEN - 1; i >= 0; --i)
buffer[i] = ((uint8_t *)buffer)[i];
break;
}
}
break;
case DEVICE_PATH_TYPE_MEDIA_DEVICE:
switch (device_node->sub_type) {
case DEVICE_PATH_SUB_TYPE_FILE_PATH: {
struct efi_device_path_file_path *fp =
(struct efi_device_path_file_path *)device_node;
buffer_size = device_node->length - 4;
r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
buffer_size, (void **) &buffer);
if (r != EFI_SUCCESS)
return NULL;
memcpy(buffer, fp->str, buffer_size);
break;
}
}
break;
}
ascii2unicode(out, buf);
out[len - 1] = 0;
/*
* For all node types that we do not yet support return
* 'UNKNOWN(type,subtype)'.
*/
if (!buffer) {
r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
2 * UNKNOWN_OUTPUT_LEN,
(void **)&buffer);
if (r != EFI_SUCCESS)
return NULL;
sprintf((char *)buffer,
"UNKNOWN(%04x,%04x)",
device_node->type,
device_node->sub_type);
for (i = UNKNOWN_OUTPUT_LEN - 1; i >= 0; --i)
buffer[i] = ((uint8_t *)buffer)[i];
}
return buffer;
return out;
}
/* helper for debug prints.. efi_free_pool() the result. */
uint16_t *efi_dp_str(struct efi_device_path *dp)
{
return efi_convert_device_node_to_text(dp, true, true);
}
static uint16_t EFIAPI *efi_convert_device_node_to_text_ext(
struct efi_device_path *device_node,
bool display_only,