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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2011 Advanced Micro Devices, Inc.
*
* 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.
*/
/******************************************************************************
* AMD Generic Encapsulated Software Architecture
*
* $Workfile:: cache_as_ram.inc
*
* Description: cache_as_ram.inc - AGESA Module Entry Point for GCC complier
*
******************************************************************************
*/
#include "gcccar.inc"
#include <cpu/x86/cache.h>
/*
* XMM map:
* xmm0: BIST
* xmm1: backup ebx -- cpu_init_detected
*/
.code32
.globl cache_as_ram_setup, disable_cache_as_ram, cache_as_ram_setup_out
cache_as_ram_setup:
post_code(0xa0)
/* enable SSE2 128bit instructions */
/* Turn on OSFXSR [BIT9] and OSXMMEXCPT [BIT10] onto CR4 register */
movl %cr4, %eax
orl $(3 << 9), %eax
movl %eax, %cr4
/* Get the cpu_init_detected */
mov $1, %eax
cpuid
shr $24, %ebx
/* Save the BIST result */
cvtsi2sd %ebp, %xmm0
/* for normal part %ebx already contain cpu_init_detected from fallback call */
/* Save the cpu_init_detected */
cvtsi2sd %ebx, %xmm1
post_code(0xa1)
AMD_ENABLE_STACK
/* Align the stack. */
and $0xFFFFFFF0, %esp
#ifdef __x86_64__
/* switch to 64 bit long mode */
mov %esi, %ecx
add $0, %ecx # core number
xor %eax, %eax
lea (0x1000+0x23)(%ecx), %edi
mov %edi, (%ecx)
mov %eax, 4(%ecx)
lea 0x1000(%ecx), %edi
movl $0x000000e3, 0x00(%edi)
movl %eax, 0x04(%edi)
movl $0x400000e3, 0x08(%edi)
movl %eax, 0x0c(%edi)
movl $0x800000e3, 0x10(%edi)
movl %eax, 0x14(%edi)
movl $0xc00000e3, 0x18(%edi)
movl %eax, 0x1c(%edi)
# load ROM based identity mapped page tables
mov %ecx, %eax
mov %eax, %cr3
# enable PAE
mov %cr4, %eax
bts $5, %eax
mov %eax, %cr4
# enable long mode
mov $0xC0000080, %ecx
rdmsr
bts $8, %eax
wrmsr
# enable paging
mov %cr0, %eax
bts $31, %eax
mov %eax, %cr0
# use call far to switch to 64-bit code segment
ljmp $0x18, $1f
1:
/* Pass the cpu_init_detected */
cvtsd2si %xmm1, %esi
/* Pass the BIST result */
cvtsd2si %xmm0, %edi
.code64
call cache_as_ram_main
.code32
#else
/* Restore the BIST result */
cvtsd2si %xmm0, %edx
/* Restore the cpu_init_detected */
cvtsd2si %xmm1, %ebx
/* Must maintain 16-byte stack alignment here. */
pushl $0x0
pushl $0x0
pushl %ebx /* init detected */
pushl %edx /* bist */
call cache_as_ram_main
#endif
/* Should never see this postcode */
post_code(0xaf)
stop:
jmp stop
disable_cache_as_ram:
/* Save return stack */
movd 0(%esp), %xmm1
movd %esp, %xmm0
/* Disable cache */
movl %cr0, %eax
orl $CR0_CacheDisable, %eax
movl %eax, %cr0
AMD_DISABLE_STACK
/* enable cache */
movl %cr0, %eax
andl $0x9fffffff, %eax
movl %eax, %cr0
xorl %eax, %eax
/* Restore the return stack */
wbinvd
movd %xmm0, %esp
movd %xmm1, (%esp)
ret
cache_as_ram_setup_out:
#ifdef __x86_64__
.code64
#endif
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