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88e38fa148
defined in vsprintf.h. (This may change, since vsprintf.h is a non-standard name, but for now it's the one to use.) There should be no need to include vsprintf.h just for DBG() statements, since include/compiler.h forces it in for a debug build anyway.
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/**************************************************************************
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OS loader
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Author: Markus Gutschke (gutschk@math.uni-muenster.de)
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Date: Sep/95
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Modifications: Ken Yap (for Etherboot/16)
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Doug Ambrisko (ELF and a.out support)
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Klaus Espenlaub (rewrote ELF and a.out (did it really work before?) support,
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added ELF Multiboot images). Someone should merge the ELF and a.out
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loaders, as most of the code is now identical. Maybe even NBI could be
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rewritten and merged into the generic loading framework. This should
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save quite a few bytes of code if you have selected more than one format.
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Ken Yap (Jan 2001)
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Added support for linear entry addresses in tagged images,
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which allows a more efficient protected mode call instead of
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going to real mode and back. Also means entry addresses > 1 MB can
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be called. Conditional on the LINEAR_EXEC_ADDR bit.
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Added support for Etherboot extension calls. Conditional on the
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TAGGED_PROGRAM_RETURNS bit. Implies LINEAR_EXEC_ADDR.
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Added support for non-MULTIBOOT ELF which also supports Etherboot
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extension calls. Conditional on the ELF_PROGRAM_RETURNS bit.
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**************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2, or (at
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* your option) any later version.
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*/
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#include "io.h"
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#include "memsizes.h"
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/* Linker symbols */
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extern char _text[];
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extern char _end[];
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int prep_segment ( physaddr_t start, physaddr_t mid, physaddr_t end ) {
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unsigned fit, i;
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DBG ( "OSLOADER preparing segment [%lX,%lX)\n", start, end );
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if ( mid > end ) {
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DBG ( "OSLOADER got filesz > memsz\n" );
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return 0;
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}
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/* Check for overlap with Etherboot runtime image */
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if ( ( end > virt_to_phys ( _text ) ) &&
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( start < virt_to_phys ( _end ) ) ) {
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DBG ( "OSLOADER got segment [%lX, %lX) "
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"overlapping etherboot [%lX, %lX)\n",
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start, end,
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virt_to_phys ( _text ), virt_to_phys ( _end ) );
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return 0;
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}
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/* Check that block fits entirely inside a single memory region */
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fit = 0;
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for ( i = 0 ; i < meminfo.map_count ; i++ ) {
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unsigned long long r_start, r_end;
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if (meminfo.map[i].type != E820_RAM)
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continue;
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r_start = meminfo.map[i].addr;
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r_end = r_start + meminfo.map[i].size;
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if ( ( start >= r_start ) && ( end <= r_end ) ) {
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fit = 1;
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break;
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}
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}
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if ( ! fit ) {
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DBG ( "OSLOADER got segment [%lX,%lX) "
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"which does not fit in any memory region\n",
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start, end );
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return 0;
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}
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/* Zero the bss */
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memset ( phys_to_virt ( mid ), 0, end - mid );
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return 1;
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}
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/*
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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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