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Annotation of qemu/roms/ipxe/src/image/segment.c, revision 1.1.1.1

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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