diff options
Diffstat (limited to 'grub-core/term/efi/serial.c')
| -rw-r--r-- | grub-core/term/efi/serial.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/grub-core/term/efi/serial.c b/grub-core/term/efi/serial.c new file mode 100644 index 0000000..4c94723 --- /dev/null +++ b/grub-core/term/efi/serial.c @@ -0,0 +1,195 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2006,2007,2008,2012 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <grub/disk.h> +#include <grub/partition.h> +#include <grub/mm.h> +#include <grub/types.h> +#include <grub/misc.h> +#include <grub/err.h> +#include <grub/term.h> +#include <grub/efi/api.h> +#include <grub/efi/efi.h> +#include <grub/efi/disk.h> +#include <grub/serial.h> +#include <grub/types.h> +#include <grub/i18n.h> + +/* GUID. */ +static grub_efi_guid_t serial_io_guid = GRUB_EFI_SERIAL_IO_GUID; + +static void +do_real_config (struct grub_serial_port *port) +{ + grub_efi_status_t status = GRUB_EFI_SUCCESS; + const grub_efi_parity_type_t parities[] = { + [GRUB_SERIAL_PARITY_NONE] = GRUB_EFI_SERIAL_NO_PARITY, + [GRUB_SERIAL_PARITY_ODD] = GRUB_EFI_SERIAL_ODD_PARITY, + [GRUB_SERIAL_PARITY_EVEN] = GRUB_EFI_SERIAL_EVEN_PARITY + }; + const grub_efi_stop_bits_t stop_bits[] = { + [GRUB_SERIAL_STOP_BITS_1] = GRUB_EFI_SERIAL_1_STOP_BIT, + [GRUB_SERIAL_STOP_BITS_1_5] = GRUB_EFI_SERIAL_1_5_STOP_BITS, + [GRUB_SERIAL_STOP_BITS_2] = GRUB_EFI_SERIAL_2_STOP_BITS, + }; + + if (port->configured) + return; + + status = efi_call_7 (port->interface->set_attributes, port->interface, + port->config.speed, + 0, 0, parities[port->config.parity], + port->config.word_len, + stop_bits[port->config.stop_bits]); + if (status != GRUB_EFI_SUCCESS) + port->broken = 1; + + status = efi_call_2 (port->interface->set_control_bits, port->interface, + port->config.rtscts ? 0x4002 : 0x2); + + port->configured = 1; +} + +/* Fetch a key. */ +static int +serial_hw_fetch (struct grub_serial_port *port) +{ + grub_efi_uintn_t bufsize = 1; + char c; + grub_efi_status_t status = GRUB_EFI_SUCCESS; + do_real_config (port); + if (port->broken) + return -1; + + status = efi_call_3 (port->interface->read, port->interface, &bufsize, &c); + if (status != GRUB_EFI_SUCCESS || bufsize == 0) + return -1; + + return c; +} + +/* Put a character. */ +static void +serial_hw_put (struct grub_serial_port *port, const int c) +{ + grub_efi_uintn_t bufsize = 1; + char c0 = c; + + do_real_config (port); + + if (port->broken) + return; + + efi_call_3 (port->interface->write, port->interface, &bufsize, &c0); +} + +/* Initialize a serial device. PORT is the port number for a serial device. + SPEED is a DTE-DTE speed which must be one of these: 2400, 4800, 9600, + 19200, 38400, 57600 and 115200. WORD_LEN is the word length to be used + for the device. Likewise, PARITY is the type of the parity and + STOP_BIT_LEN is the length of the stop bit. The possible values for + WORD_LEN, PARITY and STOP_BIT_LEN are defined in the header file as + macros. */ +static grub_err_t +serial_hw_configure (struct grub_serial_port *port, + struct grub_serial_config *config) +{ + if (config->parity != GRUB_SERIAL_PARITY_NONE + && config->parity != GRUB_SERIAL_PARITY_ODD + && config->parity != GRUB_SERIAL_PARITY_EVEN) + return grub_error (GRUB_ERR_BAD_ARGUMENT, + N_("unsupported serial port parity")); + + if (config->stop_bits != GRUB_SERIAL_STOP_BITS_1 + && config->stop_bits != GRUB_SERIAL_STOP_BITS_1_5 + && config->stop_bits != GRUB_SERIAL_STOP_BITS_2) + return grub_error (GRUB_ERR_BAD_ARGUMENT, + N_("unsupported serial port stop bits number")); + + if (config->word_len < 5 || config->word_len > 8) + return grub_error (GRUB_ERR_BAD_ARGUMENT, + N_("unsupported serial port word length")); + + port->config = *config; + port->configured = 0; + + /* FIXME: should check if the serial terminal was found. */ + + return GRUB_ERR_NONE; +} + +struct grub_serial_driver grub_efiserial_driver = + { + .configure = serial_hw_configure, + .fetch = serial_hw_fetch, + .put = serial_hw_put + }; + +void +grub_efiserial_init (void) +{ + grub_efi_uintn_t num_handles; + grub_efi_handle_t *handles; + grub_efi_handle_t *handle; + int num_serial = 0; + grub_err_t err; + + /* Find handles which support the disk io interface. */ + handles = grub_efi_locate_handle (GRUB_EFI_BY_PROTOCOL, &serial_io_guid, + 0, &num_handles); + if (! handles) + return; + + /* Make a linked list of devices. */ + for (handle = handles; num_handles--; handle++) + { + struct grub_serial_port *port; + struct grub_efi_serial_io_interface *sio; + + sio = grub_efi_open_protocol (*handle, &serial_io_guid, + GRUB_EFI_OPEN_PROTOCOL_GET_PROTOCOL); + if (! sio) + /* This should not happen... Why? */ + continue; + + port = grub_zalloc (sizeof (*port)); + if (!port) + return; + + port->name = grub_malloc (sizeof ("efiXXXXXXXXXXXXXXXXXXXX")); + if (!port->name) + { + grub_free (port); + return; + } + grub_snprintf (port->name, sizeof ("efiXXXXXXXXXXXXXXXXXXXX"), + "efi%d", num_serial++); + + port->driver = &grub_efiserial_driver; + port->interface = sio; + err = grub_serial_config_defaults (port); + if (err) + grub_print_error (); + + grub_serial_register (port); + } + + grub_free (handles); + + return; +} |