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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2000,2007 Ronald G. Minnich <rminnich@gmail.com>
* 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 <cpu/x86/mtrr.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/post_code.h>
#include <cbmem.h>
/* The full cache-as-ram size includes the cache-as-ram portion from coreboot
* and the space used by the reference code. These 2 values combined should
* be a power of 2 because the MTRR setup assumes that. */
#define CACHE_AS_RAM_SIZE \
(CONFIG_DCACHE_RAM_SIZE + CONFIG_DCACHE_RAM_MRC_VAR_SIZE)
#define CACHE_AS_RAM_BASE CONFIG_DCACHE_RAM_BASE
/* Cache 4GB - MRC_SIZE_KB for MRC */
#define CACHE_MRC_BYTES ((CONFIG_CACHE_MRC_SIZE_KB << 10) - 1)
#define CACHE_MRC_BASE (0xFFFFFFFF - CACHE_MRC_BYTES)
#define CACHE_MRC_MASK (~CACHE_MRC_BYTES)
#define CPU_MAXPHYSADDR CONFIG_CPU_ADDR_BITS
#define CPU_PHYSMASK_HI (1 << (CPU_MAXPHYSADDR - 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)
/* Zero out all fixed range and variable 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
post_code(0x22)
/* Configure the default memory type to uncacheable. */
movl $MTRR_DEF_TYPE_MSR, %ecx
rdmsr
andl $(~0x00000cff), %eax
wrmsr
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
* 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_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(0x27)
/* Enable caching for ram init code to run faster */
movl $MTRR_PHYS_BASE(2), %ecx
movl $(CACHE_MRC_BASE | MTRR_TYPE_WRPROT), %eax
xorl %edx, %edx
wrmsr
movl $MTRR_PHYS_MASK(2), %ecx
movl $(CACHE_MRC_MASK | MTRR_PHYS_MASK_VALID), %eax
movl $CPU_PHYSMASK_HI, %edx
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. It also contains the information
* for setting up MTRRs. */
movl %eax, %ebx
post_code(0x2f)
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(0x31)
/* 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
/* Clear MTRR that was used to cache MRC */
xorl %eax, %eax
xorl %edx, %edx
movl $MTRR_PHYS_BASE(2), %ecx
wrmsr
movl $MTRR_PHYS_MASK(2), %ecx
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)
/* Setup stack as indicated by return value from ramstage_main(). */
movl %ebx, %esp
/* Get number of MTRRs. */
popl %ebx
movl $MTRR_PHYS_BASE(0), %ecx
1:
testl %ebx, %ebx
jz 1f
/* Low 32 bits of MTRR base. */
popl %eax
/* Upper 32 bits of MTRR base. */
popl %edx
/* Write MTRR base. */
wrmsr
inc %ecx
/* Low 32 bits of MTRR mask. */
popl %eax
/* Upper 32 bits of MTRR mask. */
popl %edx
/* Write MTRR mask. */
wrmsr
inc %ecx
dec %ebx
jmp 1b
1:
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
/* Variable MTRRs */
.word 0x200, 0x201, 0x202, 0x203
.word 0x204, 0x205, 0x206, 0x207
.word 0x208, 0x209, 0x20A, 0x20B
.word 0x20C, 0x20D, 0x20E, 0x20F
.word 0x210, 0x211, 0x212, 0x213
mtrr_table_end:
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