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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2000,2007 Ronald G. Minnich <rminnich@gmail.com>
* Copyright (C) 2005 Eswar Nallusamy, LANL
* Copyright (C) 2005 Tyan
* (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
* Copyright (C) 2007 coresystems GmbH
* (Written by Stefan Reinauer <stepan@coresystems.de> for coresystems GmbH)
* Copyright (C) 2007,2008 Carl-Daniel Hailfinger
* Copyright (C) 2008 VIA Technologies, Inc.
* (Written by Jason Zhao <jasonzhao@viatech.com.cn> for VIA)
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <cpu/x86/stack.h>
#include <cpu/x86/mtrr.h>
#include <console/post_codes.h>
#define CacheSize CONFIG_DCACHE_RAM_SIZE
#define CacheBase CONFIG_DCACHE_RAM_BASE
/* Save the BIST result. */
movl %eax, %ebp
CacheAsRam:
/* Disable cache. */
movl %cr0, %eax
orl $(1 << 30), %eax
movl %eax, %cr0
invd
/* Set the default memory type and enable fixed and variable MTRRs. */
movl $MTRRdefType_MSR, %ecx
xorl %edx, %edx
movl $(MTRRdefTypeEn | MTRRdefTypeFixEn), %eax
wrmsr
/* Clear all MTRRs. */
xorl %edx, %edx
movl $all_mtrr_msrs, %esi
clear_fixed_var_mtrr:
lodsl (%esi), %eax
testl %eax, %eax
jz clear_fixed_var_mtrr_out
movl %eax, %ecx
xorl %eax, %eax
wrmsr
jmp clear_fixed_var_mtrr
all_mtrr_msrs:
/* fixed MTRR MSRs */
.long MTRRfix64K_00000_MSR
.long MTRRfix16K_80000_MSR
.long MTRRfix16K_A0000_MSR
.long MTRRfix4K_C0000_MSR
.long MTRRfix4K_C8000_MSR
.long MTRRfix4K_D0000_MSR
.long MTRRfix4K_D8000_MSR
.long MTRRfix4K_E0000_MSR
.long MTRRfix4K_E8000_MSR
.long MTRRfix4K_F0000_MSR
.long MTRRfix4K_F8000_MSR
/* var MTRR MSRs */
.long MTRRphysBase_MSR(0)
.long MTRRphysMask_MSR(0)
.long MTRRphysBase_MSR(1)
.long MTRRphysMask_MSR(1)
.long MTRRphysBase_MSR(2)
.long MTRRphysMask_MSR(2)
.long MTRRphysBase_MSR(3)
.long MTRRphysMask_MSR(3)
.long MTRRphysBase_MSR(4)
.long MTRRphysMask_MSR(4)
.long MTRRphysBase_MSR(5)
.long MTRRphysMask_MSR(5)
.long MTRRphysBase_MSR(6)
.long MTRRphysMask_MSR(6)
.long MTRRphysBase_MSR(7)
.long MTRRphysMask_MSR(7)
.long 0x000 /* NULL, end of table */
clear_fixed_var_mtrr_out:
movl $MTRRphysBase_MSR(0), %ecx
xorl %edx, %edx
movl $(CacheBase | MTRR_TYPE_WRBACK), %eax
wrmsr
movl $MTRRphysMask_MSR(0), %ecx
/* This assumes we never access addresses above 2^36 in CAR. */
movl $0x0000000f, %edx
movl $(~(CacheSize - 1) | MTRRphysMaskValid), %eax
wrmsr
/*
* Enable write base caching so we can do execute in place (XIP)
* on the flash ROM.
*/
movl $MTRRphysBase_MSR(1), %ecx
xorl %edx, %edx
/*
* IMPORTANT: The following calculation _must_ be done at runtime. See
* http://www.coreboot.org/pipermail/coreboot/2010-October/060855.html
*/
movl copy_and_run, %eax
andl $(~(CONFIG_XIP_ROM_SIZE - 1)), %eax
orl $MTRR_TYPE_WRBACK, %eax
wrmsr
movl $MTRRphysMask_MSR(1), %ecx
movl $0x0000000f, %edx
movl $(~(CONFIG_XIP_ROM_SIZE - 1) | MTRRphysMaskValid), %eax
wrmsr
/* Set the default memory type and enable fixed and variable MTRRs. */
/* TODO: Or also enable fixed MTRRs? Bug in the code? */
movl $MTRRdefType_MSR, %ecx
xorl %edx, %edx
movl $(MTRRdefTypeEn), %eax
wrmsr
/* Enable cache. */
movl %cr0, %eax
andl $(~((1 << 30) | (1 << 29))), %eax
movl %eax, %cr0
/* Read the range with lodsl. */
cld
movl $CacheBase, %esi
movl %esi, %edi
movl $(CacheSize >> 2), %ecx
rep lodsl
movl $CacheBase, %esi
movl %esi, %edi
movl $(CacheSize >> 2), %ecx
/*
* 0x5c5c5c5c is a memory test pattern.
* TODO: Check if everything works with the zero pattern as well.
*/
/* xorl %eax, %eax */
xorl $0x5c5c5c5c, %eax
rep stosl
#ifdef CARTEST
/*
* IMPORTANT: The following calculation _must_ be done at runtime. See
* http://www.coreboot.org/pipermail/coreboot/2010-October/060855.html
*/
movl copy_and_run, %esi
andl $(~(CONFIG_XIP_ROM_SIZE - 1)), %ei
movl %esi, %edi
movl $(CONFIG_XIP_ROM_SIZE >> 2), %ecx
rep lodsl
#endif
/*
* The key point of this CAR code is C7 cache does not turn into
* "no fill" mode, which is not compatible with general CAR code.
*/
movl $(CacheBase + CacheSize - 4), %eax
movl %eax, %esp
#ifdef CARTEST
testok:
post_code(0x40)
xorl %edx, %edx
xorl %eax, %eax
movl $0x5c5c, %edx
pushl %edx
pushl %edx
pushl %edx
pushl %edx
pushl %edx
popl %esi
popl %esi
popl %eax
popl %eax
popl %eax
cmpl %edx, %eax
jne stackerr
#endif
/* Restore the BIST result. */
movl %ebp, %eax
/* We need to set EBP? No need. */
movl %esp, %ebp
pushl %eax /* BIST */
call main
/*
* TODO: Backup stack in CACHE_AS_RAM into MMX and SSE and after we
* get STACK up, we restore that. It is only needed if we
* want to go back.
*/
/* We don't need CAR from now on. */
/* Disable cache. */
movl %cr0, %eax
orl $(1 << 30), %eax
movl %eax, %cr0
/* Set the default memory type and enable variable MTRRs. */
/* TODO: Or also enable fixed MTRRs? Bug in the code? */
movl $MTRRdefType_MSR, %ecx
xorl %edx, %edx
movl $(MTRRdefTypeEn), %eax
wrmsr
/* Enable caching for CONFIG_RAMBASE..CONFIG_RAMTOP. */
movl $MTRRphysBase_MSR(0), %ecx
xorl %edx, %edx
movl $(CONFIG_RAMBASE | MTRR_TYPE_WRBACK), %eax
wrmsr
movl $MTRRphysMask_MSR(0), %ecx
movl $0x0000000f, %edx /* AMD 40 bit 0xff */
movl $(~(CONFIG_RAMTOP - CONFIG_RAMBASE - 1) | MTRRphysMaskValid), %eax
wrmsr
/* Cache XIP_ROM_BASE-SIZE to speedup coreboot code. */
movl $MTRRphysBase_MSR(1), %ecx
xorl %edx, %edx
/*
* IMPORTANT: The following calculation _must_ be done at runtime. See
* http://www.coreboot.org/pipermail/coreboot/2010-October/060855.html
*/
movl copy_and_run, %eax
andl $(~(CONFIG_XIP_ROM_SIZE - 1)), %eax
orl $MTRR_TYPE_WRBACK, %eax
wrmsr
movl $MTRRphysMask_MSR(1), %ecx
xorl %edx, %edx
movl $(~(CONFIG_XIP_ROM_SIZE - 1) | MTRRphysMaskValid), %eax
wrmsr
/* Enable cache. */
movl %cr0, %eax
andl $(~((1 << 30) | (1 << 29))), %eax
movl %eax, %cr0
invd
/* Clear boot_complete flag. */
xorl %ebp, %ebp
__main:
post_code(POST_PREPARE_RAMSTAGE)
cld /* Clear direction flag. */
movl %ebp, %esi
movl $ROMSTAGE_STACK, %esp
movl %esp, %ebp
pushl %esi
call copy_and_run
.Lhlt:
post_code(POST_DEAD_CODE)
hlt
jmp .Lhlt