blob: 471aef96674f967a94bedebbdab54d6884ffd9e0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
/* ----------------------------------------------------------------------- *
*
* 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"
__export const com32sys_t zero_regs; /* Common all-zero register set */
static inline uint32_t eflags(void)
{
//uint32_t v;
#if __SIZEOF_POINTER__ == 4
uint32_t v;
asm volatile("pushfl ; popl %0" : "=rm" (v));
#elif __SIZEOF_POINTER__ == 8
uint64_t v;
asm volatile("pushfq ; pop %0" : "=rm" (v));
#else
#error "Unable to build for to-be-defined architecture type"
#endif
return v;
}
__export 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);
}
|
