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Annotation of qemu/roms/ipxe/src/image/segment.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (C) 2007 Michael Brown <[email protected]>.
        !             3:  *
        !             4:  * This program is free software; you can redistribute it and/or
        !             5:  * modify it under the terms of the GNU General Public License as
        !             6:  * published by the Free Software Foundation; either version 2 of the
        !             7:  * License, or any later version.
        !             8:  *
        !             9:  * This program is distributed in the hope that it will be useful, but
        !            10:  * WITHOUT ANY WARRANTY; without even the implied warranty of
        !            11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            12:  * General Public License for more details.
        !            13:  *
        !            14:  * You should have received a copy of the GNU General Public License
        !            15:  * along with this program; if not, write to the Free Software
        !            16:  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            17:  */
        !            18: 
        !            19: FILE_LICENCE ( GPL2_OR_LATER );
        !            20: 
        !            21: /**
        !            22:  * @file
        !            23:  *
        !            24:  * Executable image segments
        !            25:  *
        !            26:  */
        !            27: 
        !            28: #include <errno.h>
        !            29: #include <ipxe/uaccess.h>
        !            30: #include <ipxe/io.h>
        !            31: #include <ipxe/errortab.h>
        !            32: #include <ipxe/segment.h>
        !            33: 
        !            34: /**
        !            35:  * Segment-specific error messages
        !            36:  *
        !            37:  * This error happens sufficiently often to merit a user-friendly
        !            38:  * description.
        !            39:  */
        !            40: #define ERANGE_SEGMENT __einfo_error ( EINFO_ERANGE_SEGMENT )
        !            41: #define EINFO_ERANGE_SEGMENT \
        !            42:        __einfo_uniqify ( EINFO_ERANGE, 0x01, "Requested memory not available" )
        !            43: struct errortab segment_errors[] __errortab = {
        !            44:        __einfo_errortab ( EINFO_ERANGE_SEGMENT ),
        !            45: };
        !            46: 
        !            47: /**
        !            48:  * Prepare segment for loading
        !            49:  *
        !            50:  * @v segment          Segment start
        !            51:  * @v filesz           Size of the "allocated bytes" portion of the segment
        !            52:  * @v memsz            Size of the segment
        !            53:  * @ret rc             Return status code
        !            54:  */
        !            55: int prep_segment ( userptr_t segment, size_t filesz, size_t memsz ) {
        !            56:        struct memory_map memmap;
        !            57:        physaddr_t start = user_to_phys ( segment, 0 );
        !            58:        physaddr_t mid = user_to_phys ( segment, filesz );
        !            59:        physaddr_t end = user_to_phys ( segment, memsz );
        !            60:        unsigned int i;
        !            61: 
        !            62:        DBG ( "Preparing segment [%lx,%lx,%lx)\n", start, mid, end );
        !            63: 
        !            64:        /* Sanity check */
        !            65:        if ( filesz > memsz ) {
        !            66:                DBG ( "Insane segment [%lx,%lx,%lx)\n", start, mid, end );
        !            67:                return -EINVAL;
        !            68:        }
        !            69: 
        !            70:        /* Get a fresh memory map.  This allows us to automatically
        !            71:         * avoid treading on any regions that Etherboot is currently
        !            72:         * editing out of the memory map.
        !            73:         */
        !            74:        get_memmap ( &memmap );
        !            75: 
        !            76:        /* Look for a suitable memory region */
        !            77:        for ( i = 0 ; i < memmap.count ; i++ ) {
        !            78:                if ( ( start >= memmap.regions[i].start ) &&
        !            79:                     ( end <= memmap.regions[i].end ) ) {
        !            80:                        /* Found valid region: zero bss and return */
        !            81:                        memset_user ( segment, filesz, 0, ( memsz - filesz ) );
        !            82:                        return 0;
        !            83:                }
        !            84:        }
        !            85: 
        !            86:        /* No suitable memory region found */
        !            87:        DBG ( "Segment [%lx,%lx,%lx) does not fit into available memory\n",
        !            88:              start, mid, end );
        !            89:        return -ERANGE_SEGMENT;
        !            90: }

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