121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/* main.c - the kernel main routine */
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/*
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* PUPA -- Preliminary Universal Programming Architecture for GRUB
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* Copyright (C) 2002 Free Software Foundation, Inc.
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <pupa/kernel.h>
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#include <pupa/misc.h>
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#include <pupa/mm.h>
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#include <pupa/symbol.h>
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#include <pupa/dl.h>
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#include <pupa/term.h>
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#include <pupa/rescue.h>
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#include <pupa/file.h>
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#include <pupa/device.h>
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/* Return the end of the core image. */
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pupa_addr_t
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pupa_get_end_addr (void)
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{
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return pupa_total_module_size + pupa_end_addr;
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}
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/* Load all modules in core. */
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static void
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pupa_load_modules (void)
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{
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struct pupa_module_header *header;
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for (header = (struct pupa_module_header *) pupa_end_addr;
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header < (struct pupa_module_header *) pupa_get_end_addr ();
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header = (struct pupa_module_header *) ((char *) header + header->size))
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{
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if (! pupa_dl_load_core ((char *) header + header->offset,
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(header->size - header->offset)))
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pupa_fatal ("%s", pupa_errmsg);
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}
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}
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/* Add the region where modules reside into dynamic memory. */
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static void
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pupa_add_unused_region (void)
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{
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if (pupa_total_module_size)
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pupa_mm_init_region ((void *) pupa_end_addr, pupa_total_module_size);
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}
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/* Set the root device according to the dl prefix. */
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static void
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pupa_set_root_dev (void)
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{
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const char *prefix;
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prefix = pupa_dl_get_prefix ();
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if (prefix)
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{
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char *dev;
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dev = pupa_file_get_device_name (prefix);
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if (dev)
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{
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pupa_device_set_root (dev);
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pupa_free (dev);
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}
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}
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}
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/* Load the normal mode module and execute the normal mode if possible. */
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static void
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pupa_load_normal_mode (void)
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{
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/* Load the module. */
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pupa_dl_load ("normal");
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/* Ignore any error, because we have the rescue mode anyway. */
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pupa_errno = PUPA_ERR_NONE;
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}
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/* The main routine. */
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void
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pupa_main (void)
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{
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/* First of all, initialize the machine. */
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pupa_machine_init ();
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/* Hello. */
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pupa_setcolorstate (PUPA_TERM_COLOR_HIGHLIGHT);
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pupa_printf ("Welcome to PUPA!\n\n");
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pupa_setcolorstate (PUPA_TERM_COLOR_STANDARD);
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/* It is better to set the root device as soon as possible,
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for convenience. */
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pupa_set_root_dev ();
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/* Load pre-loaded modules and free the space. */
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pupa_register_exported_symbols ();
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pupa_load_modules ();
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pupa_add_unused_region ();
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/* Load the normal mode module. */
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pupa_load_normal_mode ();
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/* Enter the rescue mode. */
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pupa_enter_rescue_mode ();
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}
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