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 --- include/efi_api.h | 10 ++++++ lib/efi_loader/efi_device_path.c | 41 ++++++++++++++++++------ lib/efi_loader/efi_device_path_to_text.c | 13 ++++++++ 3 files changed, 55 insertions(+), 9 deletions(-)
diff --git a/include/efi_api.h b/include/efi_api.h index 48e48a6263..4ccde1d24d 100644 --- a/include/efi_api.h +++ b/include/efi_api.h @@ -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; diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c index c9315dd458..398dbc699b 100644 --- a/lib/efi_loader/efi_device_path.c +++ b/lib/efi_loader/efi_device_path.c @@ -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; diff --git a/lib/efi_loader/efi_device_path_to_text.c b/lib/efi_loader/efi_device_path_to_text.c index edc9fdc387..43554cd771 100644 --- a/lib/efi_loader/efi_device_path_to_text.c +++ b/lib/efi_loader/efi_device_path_to_text.c @@ -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; -- 2.30.2