diff options
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/intel/car/core2/cache_as_ram.S | 95 |
1 files changed, 67 insertions, 28 deletions
diff --git a/src/cpu/intel/car/core2/cache_as_ram.S b/src/cpu/intel/car/core2/cache_as_ram.S index 480d9e89bb..7d12222ad9 100644 --- a/src/cpu/intel/car/core2/cache_as_ram.S +++ b/src/cpu/intel/car/core2/cache_as_ram.S @@ -3,6 +3,7 @@ * * Copyright (C) 2000,2007 Ronald G. Minnich <rminnich@gmail.com> * Copyright (C) 2007-2008 coresystems GmbH + * Copyright (C) 2012 Kyösti Mälkki <kyosti.malkki@gmail.com> * * 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 @@ -18,8 +19,6 @@ #include <cpu/x86/cache.h> #include <cpu/x86/post_code.h> -#define CPU_PHYSMASK_HI (1 << (CONFIG_CPU_ADDR_BITS - 32) - 1) - #define CACHE_AS_RAM_SIZE CONFIG_DCACHE_RAM_SIZE #define CACHE_AS_RAM_BASE CONFIG_DCACHE_RAM_BASE @@ -37,18 +36,40 @@ cache_as_ram: 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) >> 1), %edi - xorl %eax, %eax - xorl %edx, %edx -clear_mtrrs: - movw (%esi), %bx - movzx %bx, %ecx + /* 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(0x22) + + /* Clear/disable fixed MTRRs */ + mov $fixed_mtrr_list_size, %ebx + xor %eax, %eax + xor %edx, %edx + +clear_fixed_mtrr: + add $-2, %ebx + movzwl fixed_mtrr_list(%ebx), %ecx wrmsr - add $2, %esi - dec %edi - jnz clear_mtrrs + jnz clear_fixed_mtrr + + /* Figure put how many MTRRs we have, and clear them out */ + mov $MTRR_CAP_MSR, %ecx + rdmsr + movzb %al, %ebx /* Number of variable MTRRs */ + mov $MTRR_PHYS_BASE(0), %ecx + xor %eax, %eax + xor %edx, %edx + +clear_var_mtrr: + wrmsr + inc %ecx + wrmsr + inc %ecx + dec %ebx + jnz clear_var_mtrr post_code(0x22) /* Configure the default memory type to uncacheable. */ @@ -57,6 +78,24 @@ clear_mtrrs: andl $(~0x00000cff), %eax wrmsr + /* Determine CPU_ADDR_BITS and load PHYSMASK high word to %edx. */ + movl $0x80000008, %eax + cpuid + movb %al, %cl + sub $32, %cl + movl $1, %edx + shl %cl, %edx + subl $1, %edx + + /* Preload high word of address mask (in %edx) for Variable + MTRRs 0 and 1. */ +addrsize_set_high: + xorl %eax, %eax + movl $MTRR_PHYS_MASK(0), %ecx + wrmsr + movl $MTRR_PHYS_MASK(1), %ecx + wrmsr + post_code(0x23) /* Set Cache-as-RAM base address. */ movl $(MTRR_PHYS_BASE(0)), %ecx @@ -67,8 +106,8 @@ clear_mtrrs: post_code(0x24) /* Set Cache-as-RAM mask. */ movl $(MTRR_PHYS_MASK(0)), %ecx + rdmsr movl $(~(CACHE_AS_RAM_SIZE - 1) | MTRR_PHYS_MASK_VALID), %eax - movl $CPU_PHYSMASK_HI, %edx wrmsr post_code(0x25) @@ -95,7 +134,6 @@ clear_mtrrs: movl $CACHE_AS_RAM_BASE, %esi movl %esi, %edi movl $(CACHE_AS_RAM_SIZE >> 2), %ecx - // movl $0x23322332, %eax xorl %eax, %eax rep stosl @@ -118,7 +156,7 @@ clear_mtrrs: wrmsr movl $MTRR_PHYS_MASK(1), %ecx - movl $CPU_PHYSMASK_HI, %edx + rdmsr movl $(~(CONFIG_XIP_ROM_SIZE - 1) | MTRR_PHYS_MASK_VALID), %eax wrmsr @@ -149,17 +187,18 @@ before_romstage: 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: +fixed_mtrr_list: + .word MTRR_FIX_64K_00000 + .word MTRR_FIX_16K_80000 + .word MTRR_FIX_16K_A0000 + .word MTRR_FIX_4K_C0000 + .word MTRR_FIX_4K_C8000 + .word MTRR_FIX_4K_D0000 + .word MTRR_FIX_4K_D8000 + .word MTRR_FIX_4K_E0000 + .word MTRR_FIX_4K_E8000 + .word MTRR_FIX_4K_F0000 + .word MTRR_FIX_4K_F8000 +fixed_mtrr_list_size = . - fixed_mtrr_list _cache_as_ram_setup_end: |