/* * This file is part of the coreboot project. * * Copyright (C) 2000,2007 Ronald G. Minnich * Copyright (C) 2005 Eswar Nallusamy, LANL * Copyright (C) 2005 Tyan * (Written by Yinghai Lu for Tyan) * Copyright (C) 2007 coresystems GmbH * (Written by Stefan Reinauer for coresystems GmbH) * Copyright (C) 2007,2008 Carl-Daniel Hailfinger * Copyright (C) 2008 VIA Technologies, Inc. * (Written by Jason Zhao 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 */ /* Init code - Switch CPU to protected mode and enable Cache-as-Ram (CAR). */ #include #define ROM_CODE_SEG 0x08 #define ROM_DATA_SEG 0x10 #define CACHE_RAM_CODE_SEG 0x18 #define CACHE_RAM_DATA_SEG 0x20 .align 4 .globl protected_stage0 protected_stage0: /* This code was used by v2. TODO. */ lgdt %cs:gdtptr ljmp $ROM_CODE_SEG, $__protected_stage0 .globl __protected_stage0 __protected_stage0: /* Save the BIST result. */ movl %eax, %ebp port80_post(0x01) movw $ROM_DATA_SEG, %ax movw %ax, %ds movw %ax, %es movw %ax, %ss movw %ax, %fs movw %ax, %gs /* Restore the BIST value to %eax. */ movl %ebp, %eax .align 4 #define CacheSize CONFIG_CARSIZE #define CacheBase CONFIG_CARBASE #define ASSEMBLY #include /* Save the BIST result */ movl %eax, %ebp CacheAsRam: /* disable cache */ movl %cr0, %eax orl $(0x1<<30),%eax movl %eax,%cr0 invd /* Set the default memory type and enable fixed and variable MTRRs */ movl $MTRRdefType_MSR, %ecx xorl %edx, %edx /* Enable Variable and Fixed MTRRs */ movl $0x00000c00, %eax wrmsr /* Clear all MTRRs */ xorl %edx, %edx movl $fixed_mtrr_msr, %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 clear_fixed_var_mtrr_out: /* MTRRPhysBase */ movl $0x200, %ecx xorl %edx, %edx movl $(CacheBase|MTRR_TYPE_WRBACK),%eax wrmsr /* MTRRPhysMask */ movl $0x201, %ecx /* This assumes we never access addresses above 2^36 in CAR. */ movl $0x0000000f,%edx movl $(~(CacheSize-1)|0x800),%eax wrmsr #if defined(CONFIG_XIP_ROM_SIZE) && defined(CONFIG_XIP_ROM_BASE) /* enable write base caching so we can do execute in place * on the flash rom. */ /* MTRRPhysBase */ movl $0x202, %ecx xorl %edx, %edx movl $(XIP_ROM_BASE|MTRR_TYPE_WRBACK),%eax wrmsr /* MTRRPhysMask */ movl $0x203, %ecx movl $0x0000000f,%edx movl $(~(XIP_ROM_SIZE - 1) | 0x800), %eax wrmsr #endif /* XIP_ROM_SIZE && XIP_ROM_BASE */ movl $MTRRdefType_MSR, %ecx xorl %edx, %edx /* Enable Variable and Fixed MTRRs */ movl $0x00000800, %eax wrmsr /* enable cache */ movl %cr0, %eax andl $0x9fffffff,%eax movl %eax, %cr0 /* Read the range with lodsl */ movl $CacheBase, %esi cld movl $(CacheSize >> 2), %ecx rep lodsl /* Clear the range */ movl $CacheBase, %edi movl $(CacheSize >> 2), %ecx xorl %eax, %eax rep stosl #if defined(CONFIG_XIP_ROM_SIZE) && defined(CONFIG_XIP_ROM_BASE) /* Read the XIP area */ movl XIP_ROM_BASE, %esi movl $(XIP_ROM_SIZE>>2), %ecx rep lodsl #endif /* XIP_ROM_SIZE && XIP_ROM_BASE */ /* 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. */ /* set up the stack pointer */ movl $(CacheBase + CacheSize - 4), %eax movl %eax, %esp /* Load a different set of data segments */ movw $CACHE_RAM_DATA_SEG, %ax movw %ax, %ds movw %ax, %es movw %ax, %ss lout: /* Store zero for the pointer to the global variables. */ pushl $0 /* Restore the BIST result. */ movl %ebp, %eax /* We need to set ebp? No need. */ movl %esp, %ebp /* Third parameter: cpu #: 0 == BSP all other are APs. * Always 0 for Via. */ pushl $0 /* Second parameter: init_detected */ /* Store zero for the unused init_detected parameter. */ pushl $0 /* First parameter: bist */ pushl %eax call stage1_phase1 /* We will not go back. */ fixed_mtrr_msr: .long 0x250, 0x258, 0x259 .long 0x268, 0x269, 0x26A .long 0x26B, 0x26C, 0x26D .long 0x26E, 0x26F var_mtrr_msr: .long 0x200, 0x201, 0x202, 0x203 .long 0x204, 0x205, 0x206, 0x207 .long 0x208, 0x209, 0x20A, 0x20B .long 0x20C, 0x20D, 0x20E, 0x20F .long 0x000 /* NULL, end of table */ #include "../stage0_common.S"