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/*
* This file is part of the coreboot project.
*
* Copyright 2018 Google LLC
*
* 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; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <stddef.h>
#include <stdint.h>
#include <cpu/x86/smm.h>
/*
* calls into SMM with the given cmd and subcmd in eax, and arg in ebx
*
* static inline because the resulting assembly is often smaller than
* the call sequence due to constant folding.
*/
static inline u32 call_smm(u8 cmd, u8 subcmd, void *arg)
{
u32 res = 0;
__asm__ __volatile__ (
"outb %b0, %3"
: "=a" (res)
: "a" ((subcmd << 8) | cmd), "b" (arg), "i" (APM_CNT));
return res;
}
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