diff options
Diffstat (limited to 'src/cpu/via/car/cache_as_ram.inc')
| -rw-r--r-- | src/cpu/via/car/cache_as_ram.inc | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/src/cpu/via/car/cache_as_ram.inc b/src/cpu/via/car/cache_as_ram.inc new file mode 100644 index 0000000000..3bd4046649 --- /dev/null +++ b/src/cpu/via/car/cache_as_ram.inc @@ -0,0 +1,172 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2000,2007 Ronald G. Minnich <rminnich@gmail.com> + * Copyright (C) 2005 Eswar Nallusamy, LANL + * Copyright (C) 2005 Tyan + * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan) + * Copyright (C) 2007 coresystems GmbH + * (Written by Stefan Reinauer <stepan@coresystems.de> for coresystems GmbH) + * Copyright (C) 2007,2008 Carl-Daniel Hailfinger + * Copyright (C) 2008 VIA Technologies, Inc. + * (Written by Jason Zhao <jasonzhao@viatech.com.cn> for VIA) + * + * 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 + */ + +#define CacheSize DCACHE_RAM_SIZE +#define CacheBase DCACHE_RAM_BASE + + +#include <cpu/x86/mtrr.h> + + /* Save the BIST result */ + movl %eax, %ebp + +CacheAsRam: + + /* disable cache */ + movl %cr0, %eax + orl $(0x1<<30),%eax + movl %eax,%cr0 + invd + + /* 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: + /* MTRRPhysBase */ + movl $0x200, %ecx + xorl %edx, %edx + movl $(CacheBase|MTRR_TYPE_WRBACK),%eax + wrmsr + + /* MTRRPhysMask */ + movl $0x201, %ecx + /* This assumes we never access addresses above 2^36 in CAR. */ + movl $0x0000000f,%edx + movl $(~(CacheSize-1)|0x800),%eax + wrmsr + + /* enable write base caching so we can do execute in place + * on the flash rom. + */ + /* MTRRPhysBase */ + movl $0x202, %ecx + xorl %edx, %edx + movl $(XIP_ROM_BASE|MTRR_TYPE_WRBACK),%eax + wrmsr + + /* MTRRPhysMask */ + movl $0x203, %ecx + movl $0x0000000f,%edx + movl $(~(XIP_ROM_SIZE - 1) | 0x800), %eax + wrmsr + + + movl $MTRRdefType_MSR, %ecx + xorl %edx, %edx + /* Enable Variable and Fixed MTRRs */ + movl $0x00000800, %eax + wrmsr + + movl %cr0, %eax + andl $0x9fffffff,%eax + movl %eax, %cr0 + + /* Read the range with lodsl*/ + cld + movl $CacheBase, %esi + movl %esi, %edi + movl $(CacheSize>>2), %ecx + rep lodsl + + movl $CacheBase, %esi + movl %esi, %edi + movl $(CacheSize>>2), %ecx + + /* 0x5c5c5c5c is a memory test pattern. + * TODO: Check if everything works with the zero pattern as well. */ + /*xorl %eax, %eax*/ + xorl $0x5c5c5c5c,%eax + rep stosl + + movl XIP_ROM_BASE, %esi + movl %esi, %edi + movl $(XIP_ROM_SIZE>>2), %ecx + rep lodsl + + /* The key point of this CAR code is C7 cache does not turn into + * "no fill" mode, which is not compatible with general CAR code. + */ + + movl $(CacheBase+CacheSize-4), %eax + movl %eax, %esp + +#ifdef CONFIG_CARTEST +testok: movb $0x40,%al + outb %al, $0x80 + xorl %edx, %edx + xorl %eax, %eax + movl $0x5c5c,%edx + pushl %edx + pushl %edx + pushl %edx + pushl %edx + pushl %edx + popl %esi + popl %esi + popl %eax + popl %eax + popl %eax + cmpl %edx,%eax + jne stackerr +#endif + + /* Restore the BIST result */ + movl %ebp, %eax + /* We need to set ebp ? No need */ + movl %esp, %ebp + pushl %eax /* bist */ + call amd64_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 */ |