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/* ----------------------------------------------------------------------- *
*
* Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
*
* 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, Inc., 51 Franklin St, Fifth Floor,
* Boston MA 02110-1301, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
* call16.c
*
* Simple wrapper to call 16-bit core functions from 32-bit code
*/
#include <stddef.h>
#include <stdio.h>
#include "core.h"
const com32sys_t zero_regs; /* Common all-zero register set */
static inline uint32_t eflags(void)
{
uint32_t v;
asm volatile("pushfl ; popl %0" : "=rm" (v));
return v;
}
void call16(void (*func)(void), const com32sys_t *ireg, com32sys_t *oreg)
{
com32sys_t xreg = *ireg;
/* Enable interrupts if and only if they are enabled in the caller */
xreg.eflags.l = (xreg.eflags.l & ~EFLAGS_IF) | (eflags() & EFLAGS_IF);
core_farcall((size_t)func, &xreg, oreg);
}
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