ipxe/src/arch/i386/core/hooks.c

#include "stdint.h"
#include "stddef.h"
#include "registers.h"
#include "string.h"
#include "init.h"
#include "main.h"
#include "etherboot.h"
#include "hooks.h"

/* Symbols defined by the linker */
extern char _bss[], _ebss[];

/*
 * This file provides the basic entry points from assembly code.  See
 * README.i386 for a description of the entry code path.
 *
 */

/*
 * arch_initialise(): perform any required initialisation such as
 * setting up the console device and relocating to high memory.
 *
 */
void arch_initialise ( struct i386_all_regs *regs __unused ) {
	/* Zero the BSS */
	memset ( _bss, 0, _ebss - _bss );

	/* Call all registered initialisation functions.
	 */
	call_init_fns ();
}

/*
 * arch_main() : call main() and then exit via whatever exit mechanism
 * the prefix requested.
 *
 */
void arch_main ( struct i386_all_regs *regs ) {
	void (*exit_path) ( struct i386_all_regs *regs );

	/* Determine exit path requested by prefix */
	exit_path = ( typeof ( exit_path ) ) regs->eax;

	/* Call to main() */
	regs->eax = main();

	/* Call registered per-object exit functions */
	call_exit_fns ();

	if ( exit_path ) {
		/* Prefix requested that we use a particular function
		 * as the exit path, so we call this function, which
		 * must not return.
		 */
		exit_path ( regs );
	}
}