diff options
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/intel/car/cache_as_ram_ht.inc | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/src/cpu/intel/car/cache_as_ram_ht.inc b/src/cpu/intel/car/cache_as_ram_ht.inc new file mode 100644 index 0000000000..08f5b1138d --- /dev/null +++ b/src/cpu/intel/car/cache_as_ram_ht.inc @@ -0,0 +1,268 @@ +/* + * 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. + * + * 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 + */ + +#include <cpu/x86/stack.h> +#include <cpu/x86/mtrr.h> +#include <cpu/x86/post_code.h> + +#define CPU_MAXPHYADDR 36 +#define CPU_PHYSMASK_HI (1 << (CPU_MAXPHYADDR - 32) - 1) + +#define CACHE_AS_RAM_SIZE CONFIG_DCACHE_RAM_SIZE +#define CACHE_AS_RAM_BASE CONFIG_DCACHE_RAM_BASE + + /* 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) + + /* Zero out all fixed range and variable range MTRRs. */ + movl $mtrr_table, %esi + movl $((mtrr_table_end - mtrr_table) / 2), %edi + xorl %eax, %eax + xorl %edx, %edx +clear_mtrrs: + movw (%esi), %bx + movzx %bx, %ecx + wrmsr + add $2, %esi + dec %edi + jnz clear_mtrrs + + /* Configure the default memory type to uncacheable. */ + movl $MTRRdefType_MSR, %ecx + rdmsr + andl $(~0x00000cff), %eax + wrmsr + + /* Set Cache-as-RAM base address. */ + movl $(MTRRphysBase_MSR(0)), %ecx + movl $(CACHE_AS_RAM_BASE | MTRR_TYPE_WRBACK), %eax + xorl %edx, %edx + wrmsr + + /* Set Cache-as-RAM mask. */ + movl $(MTRRphysMask_MSR(0)), %ecx + movl $(~(CACHE_AS_RAM_SIZE - 1) | MTRRphysMaskValid), %eax + movl $CPU_PHYSMASK_HI, %edx + wrmsr + + /* Enable MTRR. */ + movl $MTRRdefType_MSR, %ecx + rdmsr + orl $MTRRdefTypeEn, %eax + wrmsr + + /* Enable L2 cache. */ + movl $0x11e, %ecx + rdmsr + orl $(1 << 8), %eax + wrmsr + + /* Enable cache (CR0.CD = 0, CR0.NW = 0). */ + movl %cr0, %eax + andl $(~((1 << 30) | (1 << 29))), %eax + invd + movl %eax, %cr0 + + /* Clear the cache memory reagion. */ + movl $CACHE_AS_RAM_BASE, %esi + movl %esi, %edi + movl $(CACHE_AS_RAM_SIZE / 4), %ecx + // movl $0x23322332, %eax + xorl %eax, %eax + rep stosl + + /* Enable Cache-as-RAM mode by disabling cache. */ + movl %cr0, %eax + orl $(1 << 30), %eax + movl %eax, %cr0 + +#if CONFIG_XIP_ROM_SIZE + /* Enable cache for our code in Flash because we do XIP here */ + movl $MTRRphysBase_MSR(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_WRBACK, %eax + wrmsr + + movl $MTRRphysMask_MSR(1), %ecx + movl $CPU_PHYSMASK_HI, %edx + movl $(~(CONFIG_XIP_ROM_SIZE - 1) | MTRRphysMaskValid), %eax + wrmsr +#endif /* CONFIG_XIP_ROM_SIZE */ + + /* Enable cache. */ + movl %cr0, %eax + andl $(~((1 << 30) | (1 << 29))), %eax + movl %eax, %cr0 + + /* Set up the stack pointer. */ +#if CONFIG_USBDEBUG + /* Leave some space for the struct ehci_debug_info. */ + movl $(CACHE_AS_RAM_BASE + CACHE_AS_RAM_SIZE - 4 - 128), %eax +#else + movl $(CACHE_AS_RAM_BASE + CACHE_AS_RAM_SIZE - 4), %eax +#endif + movl %eax, %esp + + /* Restore the BIST result. */ + movl %ebp, %eax + movl %esp, %ebp + pushl %eax + + post_code(0x23) + + /* Call romstage.c main function. */ + call main + + post_code(0x2f) + + post_code(0x30) + + /* Disable cache. */ + movl %cr0, %eax + orl $(1 << 30), %eax + movl %eax, %cr0 + + post_code(0x31) + + /* Disable MTRR. */ + movl $MTRRdefType_MSR, %ecx + rdmsr + andl $(~MTRRdefTypeEn), %eax + wrmsr + + post_code(0x31) + + invd +#if 0 + xorl %eax, %eax + xorl %edx, %edx + movl $MTRRphysBase_MSR(0), %ecx + wrmsr + movl $MTRRphysMask_MSR(0), %ecx + wrmsr + movl $MTRRphysBase_MSR(1), %ecx + wrmsr + movl $MTRRphysMask_MSR(1), %ecx + wrmsr +#endif + + post_code(0x33) + + /* Enable cache. */ + movl %cr0, %eax + andl $~((1 << 30) | (1 << 29)), %eax + movl %eax, %cr0 + + post_code(0x36) + + /* Disable cache. */ + movl %cr0, %eax + orl $(1 << 30), %eax + movl %eax, %cr0 + + post_code(0x38) + + /* Enable Write Back and Speculative Reads for the first 1MB. */ + movl $MTRRphysBase_MSR(0), %ecx + movl $(0x00000000 | MTRR_TYPE_WRBACK), %eax + xorl %edx, %edx + wrmsr + movl $MTRRphysMask_MSR(0), %ecx + movl $(~(CONFIG_RAMTOP - 1) | MTRRphysMaskValid), %eax + movl $CPU_PHYSMASK_HI, %edx + wrmsr + + /* Enable caching and Speculative Reads for the last 4MB. */ + movl $MTRRphysBase_MSR(1), %ecx + movl $(0xffc00000 | MTRR_TYPE_WRPROT), %eax + xorl %edx, %edx + wrmsr + movl $MTRRphysMask_MSR(1), %ecx + movl $(~(4 * 1024 * 1024 - 1) | MTRRphysMaskValid), %eax + movl $CPU_PHYSMASK_HI, %edx + wrmsr + + post_code(0x39) + + /* And enable cache again after setting MTRRs. */ + movl %cr0, %eax + andl $~((1 << 30) | (1 << 29)), %eax + movl %eax, %cr0 + + post_code(0x3a) + + /* Enable MTRR. */ + movl $MTRRdefType_MSR, %ecx + rdmsr + orl $MTRRdefTypeEn, %eax + wrmsr + + post_code(0x3b) + + /* Invalidate the cache again. */ + invd + + post_code(0x3c) + + /* Clear boot_complete flag. */ + xorl %ebp, %ebp +__main: + post_code(POST_PREPARE_RAMSTAGE) + cld /* Clear direction flag. */ + + movl %ebp, %esi + + movl $ROMSTAGE_STACK, %esp + movl %esp, %ebp + pushl %esi + call copy_and_run + +.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 +mtrr_table_end: + |