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- /**************************************************************************
- OS loader
-
- Author: Markus Gutschke (gutschk@math.uni-muenster.de)
- Date: Sep/95
- Modifications: Ken Yap (for Etherboot/16)
- Doug Ambrisko (ELF and a.out support)
- Klaus Espenlaub (rewrote ELF and a.out (did it really work before?) support,
- added ELF Multiboot images). Someone should merge the ELF and a.out
- loaders, as most of the code is now identical. Maybe even NBI could be
- rewritten and merged into the generic loading framework. This should
- save quite a few bytes of code if you have selected more than one format.
- Ken Yap (Jan 2001)
- Added support for linear entry addresses in tagged images,
- which allows a more efficient protected mode call instead of
- going to real mode and back. Also means entry addresses > 1 MB can
- be called. Conditional on the LINEAR_EXEC_ADDR bit.
- Added support for Etherboot extension calls. Conditional on the
- TAGGED_PROGRAM_RETURNS bit. Implies LINEAR_EXEC_ADDR.
- Added support for non-MULTIBOOT ELF which also supports Etherboot
- extension calls. Conditional on the ELF_PROGRAM_RETURNS bit.
-
- **************************************************************************/
-
- /*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2, or (at
- * your option) any later version.
- */
-
- #include "io.h"
- #include "memsizes.h"
-
- /* Linker symbols */
- extern char _text[];
- extern char _end[];
-
- int prep_segment ( physaddr_t start, physaddr_t mid, physaddr_t end ) {
- unsigned fit, i;
-
- DBG ( "OSLOADER preparing segment [%lX,%lX)\n", start, end );
-
- if ( mid > end ) {
- DBG ( "OSLOADER got filesz > memsz\n" );
- return 0;
- }
-
- /* Check for overlap with Etherboot runtime image */
- if ( ( end > virt_to_phys ( _text ) ) &&
- ( start < virt_to_phys ( _end ) ) ) {
- DBG ( "OSLOADER got segment [%lX, %lX) "
- "overlapping etherboot [%lX, %lX)\n",
- start, end,
- virt_to_phys ( _text ), virt_to_phys ( _end ) );
- return 0;
- }
-
- /* Check that block fits entirely inside a single memory region */
- fit = 0;
- for ( i = 0 ; i < meminfo.map_count ; i++ ) {
- unsigned long long r_start, r_end;
-
- if (meminfo.map[i].type != E820_RAM)
- continue;
-
- r_start = meminfo.map[i].addr;
- r_end = r_start + meminfo.map[i].size;
- if ( ( start >= r_start ) && ( end <= r_end ) ) {
- fit = 1;
- break;
- }
- }
- if ( ! fit ) {
- DBG ( "OSLOADER got segment [%lX,%lX) "
- "which does not fit in any memory region\n",
- start, end );
- return 0;
- }
-
- /* Zero the bss */
- memset ( phys_to_virt ( mid ), 0, end - mid );
-
- return 1;
- }
-
- /*
- * Local variables:
- * c-basic-offset: 8
- * End:
- */
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