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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2004 Eric W. Biederman
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#ifndef CPU_X86_CACHE
#define CPU_X86_CACHE
#include <cpu/x86/cr.h>
#define CR0_CacheDisable (CR0_CD)
#define CR0_NoWriteThrough (CR0_NW)
#if !defined(__ASSEMBLER__)
/*
* Need two versions because ROMCC chokes on certain clobbers:
* cache.h:29.71: cache.h:60.24: earlymtrr.c:117.23: romstage.c:144.33:
* 0x1559920 asm Internal compiler error: lhs 1 regcm == 0
*/
#if defined(__GNUC__)
static inline void wbinvd(void)
{
asm volatile ("wbinvd" ::: "memory");
}
#else
static inline void wbinvd(void)
{
asm volatile ("wbinvd");
}
#endif
static inline void invd(void)
{
asm volatile("invd" ::: "memory");
}
/* The following functions require the always_inline due to AMD
* function STOP_CAR_AND_CPU that disables cache as
* ram, the cache as ram stack can no longer be used. Called
* functions must be inlined to avoid stack usage. Also, the
* compiler must keep local variables register based and not
* allocated them from the stack. With gcc 4.5.0, some functions
* declared as inline are not being inlined. This patch forces
* these functions to always be inlined by adding the qualifier
* __attribute__((always_inline)) to their declaration.
*/
static inline __attribute__((always_inline)) void enable_cache(void)
{
unsigned long cr0;
cr0 = read_cr0();
cr0 &= ~(CR0_CD | CR0_NW);
write_cr0(cr0);
}
static inline __attribute__((always_inline)) void disable_cache(void)
{
/* Disable and write back the cache */
unsigned long cr0;
cr0 = read_cr0();
cr0 |= CR0_CD;
wbinvd();
write_cr0(cr0);
wbinvd();
}
#if !defined(__PRE_RAM__)
void x86_enable_cache(void);
#endif
#endif /* !__ASSEMBLER__ */
#endif /* CPU_X86_CACHE */
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