287 lines
6.4 KiB
C
287 lines
6.4 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2012 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/serial.h>
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#include <grub/types.h>
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#include <grub/dl.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/time.h>
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#include <grub/i18n.h>
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#include <grub/ieee1275/console.h>
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#define IEEE1275_IHANDLE_INVALID ((grub_ieee1275_cell_t) 0)
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struct ofserial_hash_ent
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{
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char *devpath;
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/* Pointer to shortest available name on nodes representing canonical names,
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otherwise NULL. */
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const char *shortest;
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struct ofserial_hash_ent *next;
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};
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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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if (port->configured)
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return;
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if (grub_ieee1275_open (port->elem->devpath, &port->handle)
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|| port->handle == (grub_ieee1275_ihandle_t) -1)
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port->handle = IEEE1275_IHANDLE_INVALID;
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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_ssize_t actual;
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char c;
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do_real_config (port);
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if (port->handle == IEEE1275_IHANDLE_INVALID)
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return -1;
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grub_ieee1275_read (port->handle, &c, 1, &actual);
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if (actual <= 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_ssize_t actual;
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char c0 = c;
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do_real_config (port);
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if (port->handle == IEEE1275_IHANDLE_INVALID)
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return;
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grub_ieee1275_write (port->handle, &c0, 1, &actual);
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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 __attribute__ ((unused)),
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struct grub_serial_config *config __attribute__ ((unused)))
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{
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/* FIXME: no IEEE1275 serial config available. */
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return GRUB_ERR_NONE;
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}
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struct grub_serial_driver grub_ofserial_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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#define OFSERIAL_HASH_SZ 8
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static struct ofserial_hash_ent *ofserial_hash[OFSERIAL_HASH_SZ];
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static int
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ofserial_hash_fn (const char *devpath)
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{
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int hash = 0;
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while (*devpath)
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hash ^= *devpath++;
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return (hash & (OFSERIAL_HASH_SZ - 1));
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}
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static struct ofserial_hash_ent *
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ofserial_hash_find (const char *devpath)
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{
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struct ofserial_hash_ent *p = ofserial_hash[ofserial_hash_fn(devpath)];
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while (p)
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{
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if (!grub_strcmp (p->devpath, devpath))
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break;
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p = p->next;
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}
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return p;
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}
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static struct ofserial_hash_ent *
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ofserial_hash_add_real (char *devpath)
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{
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struct ofserial_hash_ent *p;
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struct ofserial_hash_ent **head = &ofserial_hash[ofserial_hash_fn(devpath)];
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p = grub_malloc(sizeof (*p));
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if (!p)
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return NULL;
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p->devpath = devpath;
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p->next = *head;
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p->shortest = 0;
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*head = p;
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return p;
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}
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static struct ofserial_hash_ent *
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ofserial_hash_add (char *devpath, char *curcan)
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{
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struct ofserial_hash_ent *p, *pcan;
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p = ofserial_hash_add_real (devpath);
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grub_dprintf ("serial", "devpath = %s, canonical = %s\n", devpath, curcan);
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if (!curcan)
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{
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p->shortest = devpath;
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return p;
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}
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pcan = ofserial_hash_find (curcan);
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if (!pcan)
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pcan = ofserial_hash_add_real (curcan);
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else
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grub_free (curcan);
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if (!pcan)
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grub_errno = GRUB_ERR_NONE;
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else
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{
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if (!pcan->shortest
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|| grub_strlen (pcan->shortest) > grub_strlen (devpath))
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pcan->shortest = devpath;
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}
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return p;
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}
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static void
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dev_iterate_real (struct grub_ieee1275_devalias *alias,
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int use_name)
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{
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struct ofserial_hash_ent *op;
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if (grub_strcmp (alias->type, "serial") != 0)
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return;
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grub_dprintf ("serial", "serial name = %s, path = %s\n", alias->name,
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alias->path);
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op = ofserial_hash_find (alias->path);
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if (!op)
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{
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char *name = grub_strdup (use_name ? alias->name : alias->path);
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char *can = grub_strdup (alias->path);
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if (!name || !can)
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{
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grub_errno = GRUB_ERR_NONE;
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grub_free (name);
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grub_free (can);
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return;
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}
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op = ofserial_hash_add (name, can);
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}
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return;
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}
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static int
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dev_iterate (struct grub_ieee1275_devalias *alias)
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{
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dev_iterate_real (alias, 0);
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return 0;
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}
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static const char *
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add_port (struct ofserial_hash_ent *ent)
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{
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struct grub_serial_port *port;
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char *ptr;
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grub_err_t err;
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if (!ent->shortest)
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return NULL;
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port = grub_zalloc (sizeof (*port));
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if (!port)
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return NULL;
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port->name = grub_malloc (sizeof ("ieee1275/")
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+ grub_strlen (ent->shortest));
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port->elem = ent;
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if (!port->name)
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return NULL;
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ptr = grub_stpcpy (port->name, "ieee1275/");
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grub_strcpy (ptr, ent->shortest);
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port->driver = &grub_ofserial_driver;
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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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return port->name;
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}
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const char *
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grub_ofserial_add_port (const char *path)
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{
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struct ofserial_hash_ent *ent;
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char *name = grub_strdup (path);
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char *can = grub_strdup (path);
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if (!name || ! can)
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{
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grub_free (name);
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grub_free (can);
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return NULL;
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}
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ent = ofserial_hash_add (name, can);
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return add_port (ent);
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}
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void
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grub_ofserial_init (void)
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{
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unsigned i;
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struct grub_ieee1275_devalias alias;
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FOR_IEEE1275_DEVALIASES(alias)
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dev_iterate_real (&alias, 1);
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grub_ieee1275_devices_iterate (dev_iterate);
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for (i = 0; i < ARRAY_SIZE (ofserial_hash); i++)
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{
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struct ofserial_hash_ent *ent;
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for (ent = ofserial_hash[i]; ent; ent = ent->next)
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add_port (ent);
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}
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}
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