/* * 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) 2008 Carl-Daniel Hailfinger * * 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 /* When we come here we are in protected mode. We expand the stack * and copy the data segment from ROM to the memory. * * After that, we call the chipset bootstrap routine that * does what is left of the chipset initialization. * * NOTE: Aligned to 4 so that we are sure that the prefetch * cache will be reloaded. */ .section .rom.text .align 4 .globl protected_stage0 protected_stage0: lgdt %cs:gdtptr ljmp $ROM_CODE_SEG, $__protected_stage0 .globl __protected_stage0 __protected_stage0: /* Save the BIST result. */ movl %eax, %ebp post_code(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 /* disable HyperThreading is done by eswar * the other is very similar to the AMD CAR, except remove amd specific msr */ #define CacheSize CONFIG_DCACHE_RAM_SIZE #define CacheBase CONFIG_DCACHE_RAM_BASE #include /* Save the BIST result */ movl %eax, %ebp CacheAsRam: /* Check whether the processor has HT capability */ movl $01, %eax cpuid btl $28, %edx jnc NotHtProcessor bswapl %ebx cmpb $01, %bh jbe NotHtProcessor /* It is a HT processor; Send SIPI to the other logical processor * within this processor so that the CAR related common system * registers are programmed accordingly */ /* Use some register that is common to both logical processors * as semaphore. Refer Appendix B, Vol.3 */ xorl %eax, %eax xorl %edx, %edx movl $0x250, %ecx wrmsr /* Figure out the logical AP's APIC ID; the following logic will work * only for processors with 2 threads. * * Refer to Vol 3. Table 7-1 for details about this logic */ movl $0xFEE00020, %esi movl (%esi), %ebx andl $0xFF000000, %ebx bswapl %ebx btl $0, %ebx jnc LogicalAP0 andb $0xFE, %bl jmp SendSIPI LogicalAP0: orb $0x01, %bl SendSIPI: bswapl %ebx /* ebx - logical AP's APIC ID */ /* Fill up the IPI command registers in the Local APIC mapped to * default address and issue SIPI to the other logical processor * within this processor die. */ RetrySIPI: movl %ebx, %eax movl $0xFEE00310, %esi movl %eax, (%esi) /* SIPI vector - F900:0000 */ movl $0x000006F9, %eax movl $0xFEE00300, %esi movl %eax, (%esi) movl $0x30, %ecx SIPIDelay: pause decl %ecx jnz SIPIDelay movl (%esi), %eax andl $0x00001000, %eax jnz RetrySIPI /* Wait for the Logical AP to complete initialization */ LogicalAPSIPINotdone: movl $0x250, %ecx rdmsr orl %eax, %eax jz LogicalAPSIPINotdone NotHtProcessor: /* 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: /* 0x06 is the WB IO type for a given 4k segment. * segs is the number of 4k segments in the area of the particular * register we want to use for CAR. * reg is the register where the IO type should be stored. */ .macro extractmask segs, reg .if \segs <= 0 /* The xorl here is superfluous because at the point of first execution * of this macro, %eax and %edx are cleared. Later invocations of this * macro will have a monotonically increasing segs parameter. */ xorl \reg, \reg .elseif \segs == 1 movl $0x06000000, \reg /* WB IO type */ .elseif \segs == 2 movl $0x06060000, \reg /* WB IO type */ .elseif \segs == 3 movl $0x06060600, \reg /* WB IO type */ .elseif \segs >= 4 movl $0x06060606, \reg /* WB IO type */ .endif .endm /* size is the cache size in bytes we want to use for CAR. * windowoffset is the 32k-aligned window into CAR size */ .macro simplemask carsize, windowoffset /* DO NOT CHANGE THE FORMATTING of the two lines below! Whitespace is * interpreted as an argument delimiter by some versions of GNU as. */ extractmask (((\carsize-\windowoffset)/0x1000)-4), %eax extractmask (((\carsize-\windowoffset)/0x1000)), %edx .endm #if CacheSize > 0x10000 #error Invalid CAR size, must be at most 64k. #endif #if CacheSize < 0x1000 #error Invalid CAR size, must be at least 4k. This is a processor limitation. #endif #if (CacheSize & (0x1000 - 1)) #error Invalid CAR size, is not a multiple of 4k. This is a processor limitation. #endif #if CacheSize > 0x8000 /* enable caching for 32K-64K using fixed mtrr */ movl $0x268, %ecx /* fix4k_c0000*/ simplemask CacheSize, 0x8000 wrmsr #endif /* enable caching for 0-32K using fixed mtrr */ movl $0x269, %ecx /* fix4k_c8000*/ simplemask CacheSize, 0 wrmsr #if defined(CONFIG_XIP_ROM_SIZE) && defined(CONFIG_XIP_ROM_BASE) #if defined(CONFIG_TINY_BOOTBLOCK) && CONFIG_TINY_BOOTBLOCK #define REAL_XIP_ROM_BASE AUTO_XIP_ROM_BASE #else #define REAL_XIP_ROM_BASE CONFIG_XIP_ROM_BASE #endif /* enable write base caching so we can do execute in place * on the flash rom. */ movl $0x202, %ecx xorl %edx, %edx movl $REAL_XIP_ROM_BASE, %eax orl $MTRR_TYPE_WRBACK, %eax wrmsr movl $0x203, %ecx movl $0x0000000f, %edx movl $(~(CONFIG_XIP_ROM_SIZE - 1) | 0x800), %eax wrmsr #endif /* CONFIG_XIP_ROM_SIZE && CONFIG_XIP_ROM_BASE */ /* 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 /* TODO: make this a config variable */ #if CARTEST /* check the cache as ram */ movl $CacheBase, %esi movl $(CacheSize>>2), %ecx .xin1: movl %esi, %eax movl %eax, (%esi) decl %ecx je .xout1 add $4, %esi jmp .xin1 .xout1: movl $CacheBase, %esi // movl $(CacheSize>>2), %ecx movl $4, %ecx .xin1x: movl %esi, %eax movl $0x4000, %edx movb %ah, %al .testx1: outb %al, $0x80 decl %edx jnz .testx1 movl (%esi), %eax cmpb 0xff, %al je .xin2 /* dont show */ movl $0x4000, %edx .testx2: outb %al, $0x80 decl %edx jnz .testx2 .xin2: decl %ecx je .xout1x add $4, %esi jmp .xin1x .xout1x: #endif 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. * 0 until SMP support is added. */ pushl $0 /* Second parameter: init_detected */ /* Store zero for the unused init_detected parameter. */ pushl $0 /* First parameter: bist */ pushl %eax call main /* 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 */