94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
#include "stdint.h"
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#include "stddef.h"
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#include "registers.h"
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#include "string.h"
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#include "hooks.h"
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#include "init.h"
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#include "main.h"
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#ifdef REALMODE
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#include "realmode.h"
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#endif
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/* Symbols defined by the linker */
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extern char _bss[], _ebss[];
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/*
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* This file provides the basic entry points from assembly code. See
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* README.i386 for a description of the entry code path.
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*
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* This file is compiled to two different object files: hooks.o and
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* hooks_rm.o. REALMODE is defined when compiling hooks_rm.o
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*
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*/
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/*
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* arch_initialise(): perform any required initialisation such as
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* setting up the console device and relocating to high memory. Note
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* that if we relocate to high memory and the prefix is in base
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* memory, then we will need to install a copy of librm in base memory
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* and adjust retaddr so that we return to the installed copy.
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*
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*/
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#ifdef REALMODE
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void arch_rm_initialise ( struct i386_all_regs *regs,
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void (*retaddr) (void) )
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#else /* REALMODE */
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void arch_initialise ( struct i386_all_regs *regs,
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void (*retaddr) (void) __unused )
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#endif /* REALMODE */
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{
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/* Zero the BSS */
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memset ( _bss, 0, _ebss - _bss );
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/* Call all registered initialisation functions.
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*/
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call_init_fns ();
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}
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#ifdef REALMODE
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/*
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* arch_rm_main() : call main() and then exit via whatever exit mechanism
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* the prefix requested.
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*
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*/
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void arch_rm_main ( struct i386_all_regs *regs ) {
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struct i386_all_regs regs_copy;
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void (*exit_fn) ( struct i386_all_regs *regs );
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/* Take a copy of the registers, because the memory holding
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* them will probably be trashed by the time main() returns.
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*/
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regs_copy = *regs;
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exit_fn = ( typeof ( exit_fn ) ) regs_copy.eax;
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/* Call to main() */
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regs_copy.eax = main();
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/* Call registered per-object exit functions */
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call_exit_fns ();
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if ( exit_fn ) {
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/* Prefix requested that we use a particular function
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* as the exit path, so we call this function, which
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* must not return.
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*/
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exit_fn ( ®s_copy );
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}
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}
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#else /* REALMODE */
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/*
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* arch_main() : call main() and return
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*
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*/
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void arch_main ( struct i386_all_regs *regs ) {
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regs->eax = main();
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/* Call registered per-object exit functions */
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call_exit_fns ();
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};
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#endif /* REALMODE */
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