/* * This file is part of the coreboot project. * * Copyright (C) 2000,2007 Ronald G. Minnich * Copyright (C) 2007-2008 coresystems GmbH * * 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. */ #include #include #include #define CACHE_AS_RAM_SIZE CONFIG_DCACHE_RAM_SIZE #define CACHE_AS_RAM_BASE CONFIG_DCACHE_RAM_BASE #define CPU_PHYSMASK_HI (1 << (CONFIG_CPU_ADDR_BITS - 32) - 1) #define NoEvictMod_MSR 0x2e0 /* Save the BIST result. */ movl %eax, %ebp cache_as_ram: post_code(0x20) /* Send INIT IPI to all excluding ourself. */ movl $0x000C4500, %eax movl $0xFEE00300, %esi movl %eax, (%esi) /* All CPUs need to be in Wait for SIPI state */ wait_for_sipi: movl (%esi), %eax bt $12, %eax jc wait_for_sipi post_code(0x21) /* Clean-up MTRR_DEF_TYPE_MSR. */ movl $MTRR_DEF_TYPE_MSR, %ecx xorl %eax, %eax xorl %edx, %edx wrmsr post_code(0x22) /* Zero out all fixed range MTRRs. */ movl $mtrr_table, %esi movl $((mtrr_table_end - mtrr_table) >> 1), %edi xorl %eax, %eax xorl %edx, %edx clear_mtrrs: movw (%esi), %bx movzx %bx, %ecx wrmsr add $2, %esi dec %edi jnz clear_mtrrs /* Zero out all variable range MTRRs. */ movl $MTRR_CAP_MSR, %ecx rdmsr andl $0xff, %eax shl $1, %eax movl %eax, %edi movl $0x200, %ecx xorl %eax, %eax xorl %edx, %edx clear_var_mtrrs: wrmsr add $1, %ecx dec %edi jnz clear_var_mtrrs post_code(0x23) /* Set Cache-as-RAM base address. */ movl $(MTRR_PHYS_BASE(0)), %ecx movl $(CACHE_AS_RAM_BASE | MTRR_TYPE_WRBACK), %eax xorl %edx, %edx wrmsr post_code(0x24) /* Set Cache-as-RAM mask. */ movl $(MTRR_PHYS_MASK(0)), %ecx movl $(~(CACHE_AS_RAM_SIZE - 1) | MTRR_PHYS_MASK_VALID), %eax movl $CPU_PHYSMASK_HI, %edx wrmsr post_code(0x25) /* Enable MTRR. */ movl $MTRR_DEF_TYPE_MSR, %ecx rdmsr orl $MTRR_DEF_TYPE_EN, %eax wrmsr /* Enable cache (CR0.CD = 0, CR0.NW = 0). */ movl %cr0, %eax andl $(~(CR0_CacheDisable | CR0_NoWriteThrough)), %eax invd movl %eax, %cr0 /* enable the 'no eviction' mode */ movl $NoEvictMod_MSR, %ecx rdmsr orl $1, %eax andl $~2, %eax wrmsr /* Clear the cache memory region. This will also fill up the cache. */ movl $CACHE_AS_RAM_BASE, %esi movl %esi, %edi movl $(CACHE_AS_RAM_SIZE >> 2), %ecx // movl $0x23322332, %eax xorl %eax, %eax rep stosl /* enable the 'no eviction run' state */ movl $NoEvictMod_MSR, %ecx rdmsr orl $3, %eax wrmsr post_code(0x26) /* Enable Cache-as-RAM mode by disabling cache. */ movl %cr0, %eax orl $CR0_CacheDisable, %eax movl %eax, %cr0 /* Enable cache for our code in Flash because we do XIP here */ movl $MTRR_PHYS_BASE(1), %ecx xorl %edx, %edx /* * IMPORTANT: The following calculation _must_ be done at runtime. See * https://www.coreboot.org/pipermail/coreboot/2010-October/060855.html */ movl $copy_and_run, %eax andl $(~(CONFIG_XIP_ROM_SIZE - 1)), %eax orl $MTRR_TYPE_WRPROT, %eax wrmsr movl $MTRR_PHYS_MASK(1), %ecx movl $CPU_PHYSMASK_HI, %edx movl $(~(CONFIG_XIP_ROM_SIZE - 1) | MTRR_PHYS_MASK_VALID), %eax wrmsr post_code(0x28) /* Enable cache. */ movl %cr0, %eax andl $(~(CR0_CacheDisable | CR0_NoWriteThrough)), %eax movl %eax, %cr0 /* Setup the stack. */ movl $(CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE), %eax movl %eax, %esp /* Restore the BIST result. */ movl %ebp, %eax movl %esp, %ebp pushl %eax before_romstage: post_code(0x29) /* Call romstage.c main function. */ call romstage_main /* Save return value from romstage_main. It contains the stack to use * after cache-as-ram is torn down. */ movl %eax, %esp post_code(0x30) /* Disable cache. */ movl %cr0, %eax orl $CR0_CacheDisable, %eax movl %eax, %cr0 post_code(0x31) /* Disable MTRR. */ movl $MTRR_DEF_TYPE_MSR, %ecx rdmsr andl $(~MTRR_DEF_TYPE_EN), %eax wrmsr post_code(0x32) /* Disable the no eviction run state */ movl $NoEvictMod_MSR, %ecx rdmsr andl $~2, %eax wrmsr invd /* Disable the no eviction mode */ rdmsr andl $~1, %eax wrmsr post_code(0x33) /* Enable cache. */ movl %cr0, %eax andl $~(CR0_CacheDisable | CR0_NoWriteThrough), %eax movl %eax, %cr0 post_code(0x36) /* Disable cache. */ movl %cr0, %eax orl $CR0_CacheDisable, %eax movl %eax, %cr0 post_code(0x38) /* Enable Write Back and Speculative Reads for the first MB * and ramstage. */ movl $MTRR_PHYS_BASE(0), %ecx movl $(0x00000000 | MTRR_TYPE_WRBACK), %eax xorl %edx, %edx wrmsr movl $MTRR_PHYS_MASK(0), %ecx movl $(~(CACHE_TMP_RAMTOP - 1) | MTRR_PHYS_MASK_VALID), %eax movl $CPU_PHYSMASK_HI, %edx // 36bit address space wrmsr #if CACHE_ROM_SIZE /* Enable Caching and speculative Reads for the * complete ROM now that we actually have RAM. */ movl $MTRR_PHYS_BASE(1), %ecx movl $(CACHE_ROM_BASE | MTRR_TYPE_WRPROT), %eax xorl %edx, %edx wrmsr movl $MTRR_PHYS_MASK(1), %ecx movl $(~(CACHE_ROM_SIZE - 1) | MTRR_PHYS_MASK_VALID), %eax movl $CPU_PHYSMASK_HI, %edx wrmsr #endif post_code(0x39) /* And enable cache again after setting MTRRs. */ movl %cr0, %eax andl $~(CR0_CacheDisable | CR0_NoWriteThrough), %eax movl %eax, %cr0 post_code(0x3a) /* Enable MTRR. */ movl $MTRR_DEF_TYPE_MSR, %ecx rdmsr orl $MTRR_DEF_TYPE_EN, %eax wrmsr post_code(0x3b) /* Invalidate the cache again. */ invd post_code(0x3c) __main: post_code(POST_PREPARE_RAMSTAGE) cld /* Clear direction flag. */ call romstage_after_car .Lhlt: post_code(POST_DEAD_CODE) hlt jmp .Lhlt mtrr_table: /* Fixed MTRRs */ .word 0x250, 0x258, 0x259 .word 0x268, 0x269, 0x26A .word 0x26B, 0x26C, 0x26D .word 0x26E, 0x26F mtrr_table_end: