63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/*
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Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>
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This file is part of Aedrix.
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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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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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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <atags.h>
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extern uint32 atags_ptr;
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int atag_valid(struct atag *a) {
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switch (a->tag) {
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case ATAG_NONE:
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return a->size == 2;
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case ATAG_CORE:
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return a->size == 2 || a->size == 5;
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case ATAG_MEM:
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case ATAG_INITRD2:
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case ATAG_SERIAL:
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return a->size == 4;
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case ATAG_VIDEOTEXT:
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case ATAG_RAMDISK:
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return a->size == 5;
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case ATAG_REVISION:
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return a->size == 3;
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case ATAG_VIDEOLFB:
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return a->size == 8;
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case ATAG_CMDLINE:
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return a->size >= 3;
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default:
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return 0;
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}
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}
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int _atags_mem_region(struct atag **mem_header, int initialize) {
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if (initialize)
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*mem_header = (struct atag *)atags_ptr;
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else
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*mem_header = (struct atag *)((uint32 *)*mem_header + (*mem_header)->size);
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while (atag_valid(*mem_header) && (*mem_header)->tag != ATAG_NONE && (*mem_header)->tag != ATAG_MEM) {
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*mem_header = (struct atag *)((uint32 *)*mem_header + (*mem_header)->size);
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}
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if (!atag_valid(*mem_header) || (*mem_header)->tag == ATAG_NONE)
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return -1;
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return 0;
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}
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