9f8acdaa5d
RTS/CTS flow control.
192 lines
5.5 KiB
C
192 lines
5.5 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2006,2007,2008,2012 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/disk.h>
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#include <grub/partition.h>
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#include <grub/mm.h>
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#include <grub/types.h>
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#include <grub/misc.h>
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#include <grub/err.h>
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#include <grub/term.h>
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#include <grub/efi/api.h>
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#include <grub/efi/efi.h>
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#include <grub/efi/disk.h>
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#include <grub/serial.h>
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#include <grub/types.h>
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#include <grub/i18n.h>
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/* GUID. */
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static grub_efi_guid_t serial_io_guid = GRUB_EFI_SERIAL_IO_GUID;
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static void
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do_real_config (struct grub_serial_port *port)
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{
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grub_efi_status_t status = GRUB_EFI_SUCCESS;
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const grub_efi_parity_type_t parities[] = {
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[GRUB_SERIAL_PARITY_NONE] = GRUB_EFI_SERIAL_NO_PARITY,
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[GRUB_SERIAL_PARITY_ODD] = GRUB_EFI_SERIAL_ODD_PARITY,
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[GRUB_SERIAL_PARITY_EVEN] = GRUB_EFI_SERIAL_EVEN_PARITY
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};
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const grub_efi_stop_bits_t stop_bits[] = {
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[GRUB_SERIAL_STOP_BITS_1] = GRUB_EFI_SERIAL_1_STOP_BIT,
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[GRUB_SERIAL_STOP_BITS_1_5] = GRUB_EFI_SERIAL_1_5_STOP_BITS,
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[GRUB_SERIAL_STOP_BITS_2] = GRUB_EFI_SERIAL_2_STOP_BITS,
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};
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if (port->configured)
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return;
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status = efi_call_7 (port->interface->set_attributes, port->interface,
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port->config.speed,
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0, 0, parities[port->config.parity],
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port->config.word_len,
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stop_bits[port->config.stop_bits]);
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if (status != GRUB_EFI_SUCCESS)
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port->broken = 1;
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status = efi_call_2 (port->interface->set_control_bits, port->interface,
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port->config.rtscts ? 0x4002 : 0x2);
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port->configured = 1;
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}
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/* Fetch a key. */
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static int
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serial_hw_fetch (struct grub_serial_port *port)
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{
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grub_efi_uintn_t bufsize = 1;
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char c;
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grub_efi_status_t status = GRUB_EFI_SUCCESS;
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do_real_config (port);
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if (port->broken)
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return -1;
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status = efi_call_3 (port->interface->read, port->interface, &bufsize, &c);
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if (status != GRUB_EFI_SUCCESS || bufsize == 0)
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return -1;
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return c;
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}
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/* Put a character. */
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static void
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serial_hw_put (struct grub_serial_port *port, const int c)
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{
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grub_efi_uintn_t bufsize = 1;
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char c0 = c;
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do_real_config (port);
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if (port->broken)
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return;
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efi_call_3 (port->interface->write, port->interface, &bufsize, &c0);
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}
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/* Initialize a serial device. PORT is the port number for a serial device.
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SPEED is a DTE-DTE speed which must be one of these: 2400, 4800, 9600,
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19200, 38400, 57600 and 115200. WORD_LEN is the word length to be used
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for the device. Likewise, PARITY is the type of the parity and
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STOP_BIT_LEN is the length of the stop bit. The possible values for
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WORD_LEN, PARITY and STOP_BIT_LEN are defined in the header file as
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macros. */
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static grub_err_t
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serial_hw_configure (struct grub_serial_port *port,
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struct grub_serial_config *config)
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{
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if (config->parity != GRUB_SERIAL_PARITY_NONE
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&& config->parity != GRUB_SERIAL_PARITY_ODD
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&& config->parity != GRUB_SERIAL_PARITY_EVEN)
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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N_("unsupported serial port parity"));
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if (config->stop_bits != GRUB_SERIAL_STOP_BITS_1
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&& config->stop_bits != GRUB_SERIAL_STOP_BITS_1_5
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&& config->stop_bits != GRUB_SERIAL_STOP_BITS_2)
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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N_("unsupported serial port stop bits number"));
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if (config->word_len < 5 || config->word_len > 8)
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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N_("unsupported serial port word length"));
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port->config = *config;
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port->configured = 0;
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/* FIXME: should check if the serial terminal was found. */
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return GRUB_ERR_NONE;
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}
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struct grub_serial_driver grub_efiserial_driver =
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{
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.configure = serial_hw_configure,
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.fetch = serial_hw_fetch,
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.put = serial_hw_put
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};
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void
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grub_efiserial_init (void)
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{
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grub_efi_uintn_t num_handles;
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grub_efi_handle_t *handles;
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grub_efi_handle_t *handle;
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int num_serial = 0;
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grub_err_t err;
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/* Find handles which support the disk io interface. */
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handles = grub_efi_locate_handle (GRUB_EFI_BY_PROTOCOL, &serial_io_guid,
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0, &num_handles);
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if (! handles)
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return;
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/* Make a linked list of devices. */
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for (handle = handles; num_handles--; handle++)
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{
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struct grub_serial_port *port;
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struct grub_efi_serial_io_interface *sio;
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sio = grub_efi_open_protocol (*handle, &serial_io_guid,
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GRUB_EFI_OPEN_PROTOCOL_GET_PROTOCOL);
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if (! sio)
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/* This should not happen... Why? */
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continue;
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port = grub_zalloc (sizeof (*port));
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if (!port)
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return;
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port->name = grub_malloc (sizeof ("efiXXXXXXXXXXXXXXXXXXXX"));
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if (!port->name)
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return;
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grub_snprintf (port->name, sizeof ("efiXXXXXXXXXXXXXXXXXXXX"),
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"efi%d", num_serial++);
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port->driver = &grub_efiserial_driver;
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port->interface = sio;
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err = grub_serial_config_defaults (port);
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if (err)
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grub_print_error ();
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grub_serial_register (port);
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}
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grub_free (handles);
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return;
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}
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