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efi_loader: Uart device path 

When uploading an EFI binary via the UART we need to assign a device path.

* Provide devicepath node to text conversion for Uart() node.
* Provide function to create Uart() device path.
* Add UART support to efi_dp_from_name().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2021-03-19 02:49:54 +01:00
parent 134d3387e1
commit f027222ad8
3 changed files with 55 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/efi_api.h
View File

@ -523,6 +523,7 @@ struct efi_device_path_acpi_path {
# define DEVICE_PATH_SUB_TYPE_MSG_SCSI 0x02
# define DEVICE_PATH_SUB_TYPE_MSG_USB 0x05
# define DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR 0x0b
# define DEVICE_PATH_SUB_TYPE_MSG_UART 0x0e
# define DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS 0x0f
# define DEVICE_PATH_SUB_TYPE_MSG_SATA 0x12
# define DEVICE_PATH_SUB_TYPE_MSG_NVME 0x17
@ -542,6 +543,15 @@ struct efi_device_path_scsi {
u16 logical_unit_number;
} __packed;
struct efi_device_path_uart {
struct efi_device_path dp;
u32 reserved;
u64 baud_rate;
u8 data_bits;
u8 parity;
u8 stop_bits;
} __packed;
struct efi_device_path_usb {
struct efi_device_path dp;
u8 parent_port_number;

41
lib/efi_loader/efi_device_path.c
View File

@ -960,6 +960,28 @@ struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part,
return start;
}
struct efi_device_path *efi_dp_from_uart(void)
{
void *buf, *pos;
struct efi_device_path_uart *uart;
size_t dpsize = sizeof(ROOT) + sizeof(*uart) + sizeof(END);
buf = dp_alloc(dpsize);
if (!buf)
return NULL;
pos = buf;
memcpy(pos, &ROOT, sizeof(ROOT));
pos += sizeof(ROOT);
uart = pos;
uart->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
uart->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_UART;
uart->dp.length = sizeof(*uart);
pos += sizeof(*uart);
memcpy(pos, &END, sizeof(END));
return buf;
}
#ifdef CONFIG_NET
struct efi_device_path *efi_dp_from_eth(void)
{
@ -1086,7 +1108,6 @@ efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
struct efi_device_path **device,
struct efi_device_path **file)
{
int is_net;
struct blk_desc *desc = NULL;
struct disk_partition fs_partition;
int part = 0;
@ -1096,8 +1117,15 @@ efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
if (path && !file)
return EFI_INVALID_PARAMETER;
is_net = !strcmp(dev, "Net");
if (!is_net) {
if (!strcmp(dev, "Net")) {
#ifdef CONFIG_NET
if (device)
*device = efi_dp_from_eth();
#endif
} else if (!strcmp(dev, "Uart")) {
if (device)
*device = efi_dp_from_uart();
} else {
part = blk_get_device_part_str(dev, devnr, &desc, &fs_partition,
1);
if (part < 0 || !desc)
@ -1105,11 +1133,6 @@ efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
if (device)
*device = efi_dp_from_part(desc, part);
} else {
#ifdef CONFIG_NET
if (device)
*device = efi_dp_from_eth();
#endif
}
if (!path)
@ -1120,7 +1143,7 @@ efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
s = filename;
while ((s = strchr(s, '/')))
*s++ = '\\';
*file = efi_dp_from_file(is_net ? NULL : desc, part, filename);
*file = efi_dp_from_file(desc, part, filename);
if (!*file)
return EFI_INVALID_PARAMETER;

13
lib/efi_loader/efi_device_path_to_text.c
View File

@ -118,6 +118,19 @@ static char *dp_msging(char *s, struct efi_device_path *dp)
ide->logical_unit_number);
break;
}
case DEVICE_PATH_SUB_TYPE_MSG_UART: {
struct efi_device_path_uart *uart =
(struct efi_device_path_uart *)dp;
s += sprintf(s, "Uart(%lld,%d,%d,", uart->baud_rate,
uart->data_bits, uart->parity);
switch (uart->stop_bits) {
case 2:
s += sprintf(s, "1.5)");
default:
s += sprintf(s, "%d)", uart->stop_bits);
}
break;
}
case DEVICE_PATH_SUB_TYPE_MSG_USB: {
struct efi_device_path_usb *udp =
(struct efi_device_path_usb *)dp;