91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2023 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/serial.h>
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#include <grub/term.h>
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#include <grub/types.h>
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#include <grub/pci.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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static int
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find_pciserial (grub_pci_device_t dev, grub_pci_id_t pciid __attribute__ ((unused)), void *data __attribute__ ((unused)))
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{
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grub_pci_address_t cmd_addr, class_addr, bar_addr;
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struct grub_serial_port *port;
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grub_uint32_t class, bar;
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grub_uint16_t cmdreg;
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grub_err_t err;
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cmd_addr = grub_pci_make_address (dev, GRUB_PCI_REG_COMMAND);
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cmdreg = grub_pci_read (cmd_addr);
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class_addr = grub_pci_make_address (dev, GRUB_PCI_REG_REVISION);
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class = grub_pci_read (class_addr);
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bar_addr = grub_pci_make_address (dev, GRUB_PCI_REG_ADDRESS_REG0);
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bar = grub_pci_read (bar_addr);
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/* 16550 compatible MODEM or SERIAL. */
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if (((class >> 16) != GRUB_PCI_CLASS_COMMUNICATION_MODEM &&
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(class >> 16) != GRUB_PCI_CLASS_COMMUNICATION_SERIAL) ||
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((class >> 8) & 0xff) != GRUB_PCI_SERIAL_16550_COMPATIBLE)
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return 0;
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if ((bar & GRUB_PCI_ADDR_SPACE_MASK) != GRUB_PCI_ADDR_SPACE_IO)
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return 0;
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port = grub_zalloc (sizeof (*port));
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if (port == NULL)
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return 0;
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port->name = grub_xasprintf ("pci,%02x:%02x.%x",
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grub_pci_get_bus (dev),
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grub_pci_get_device (dev),
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grub_pci_get_function (dev));
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if (port->name == NULL)
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goto fail;
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grub_pci_write (cmd_addr, cmdreg | GRUB_PCI_COMMAND_IO_ENABLED);
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port->driver = &grub_ns8250_driver;
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port->port = bar & GRUB_PCI_ADDR_IO_MASK;
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err = grub_serial_config_defaults (port);
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if (err != GRUB_ERR_NONE)
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{
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grub_print_error ();
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goto fail;
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}
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err = grub_serial_register (port);
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if (err != GRUB_ERR_NONE)
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goto fail;
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return 0;
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fail:
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grub_free (port->name);
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grub_free (port);
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return 0;
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}
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void
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grub_pciserial_init (void)
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{
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grub_pci_iterate (find_pciserial, NULL);
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}
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