diff options
Diffstat (limited to 'src/cpu/x86')
| -rw-r--r-- | src/cpu/x86/car/cache_as_ram.inc | 97 |
1 files changed, 71 insertions, 26 deletions
diff --git a/src/cpu/x86/car/cache_as_ram.inc b/src/cpu/x86/car/cache_as_ram.inc index ee569a31a7..7461a014af 100644 --- a/src/cpu/x86/car/cache_as_ram.inc +++ b/src/cpu/x86/car/cache_as_ram.inc @@ -1,3 +1,28 @@ +/* + * This file is part of the LinuxBIOS 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 Carl-Daniel Hailfinger + * + * 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 + */ + /* We will use 4K bytes only */ /* disable HyperThreading is done by eswar*/ /* other's is the same as AMD except remove amd specific msr */ @@ -106,38 +131,58 @@ clear_fixed_var_mtrr: jmp clear_fixed_var_mtrr clear_fixed_var_mtrr_out: -#if CacheSize == 0x10000 - /* enable caching for 64K using fixed mtrr */ +/* 0x06 is the WB IO type for a given 4k segment. + * segs is the number of 4k segments in the area of the particular + * register we want to use for CAR. + * reg is the register where the IO type should be stored. + */ +.macro extractmask segs, reg +.if \segs <= 0 + /* The xorl here is superfluous because at the point of first execution + * of this macro, %eax and %edx are cleared. Later invocations of this + * macro will have a monotonically increasing segs parameter. + */ + xorl \reg, \reg +.elseif \segs == 1 + movl $0x06000000, \reg +.elseif \segs == 2 + movl $0x06060000, \reg +.elseif \segs == 3 + movl $0x06060600, \reg +.elseif \segs >= 4 + movl $0x06060606, \reg +.endif +.endm + +/* size is the cache size in bytes we want to use for CAR. + * windowoffset is the 32k-aligned window into CAR size + */ +.macro simplemask carsize, windowoffset + simplemask_helper (((\carsize - \windowoffset) / 0x1000) - 4), %eax + simplemask_helper (((\carsize - \windowoffset) / 0x1000)), %edx +.endm + +#if CacheSize > 0x10000 +#error Invalid CAR size, must be at most 64k. +#endif +#if CacheSize < 0x1000 +#error Invalid CAR size, must be at least 4k. This is a processor limitation. +#endif +#if (CacheSize & (0x1000 - 1)) +#error Invalid CAR size, is not a multiple of 4k. This is a processor limitation. +#endif + +#if CacheSize > 0x8000 + /* enable caching for 32K-64K using fixed mtrr */ movl $0x268, %ecx /* fix4k_c0000*/ - movl $0x06060606, %eax /* WB IO type */ - movl %eax, %edx + simplemask CacheSize, 0x8000 wrmsr - movl $0x269, %ecx - wrmsr #endif -#if CacheSize == 0x8000 - /* enable caching for 32K using fixed mtrr */ + /* enable caching for 0-32K using fixed mtrr */ movl $0x269, %ecx /* fix4k_c8000*/ - movl $0x06060606, %eax /* WB IO type */ - movl %eax, %edx + simplemask CacheSize, 0 wrmsr -#endif - - /* enable caching for 16K/8K/4K using fixed mtrr */ - movl $0x269, %ecx /* fix4k_cc000*/ -#if CacheSize == 0x4000 - movl $0x06060606, %edx /* WB IO type */ -#endif -#if CacheSize == 0x2000 - movl $0x06060000, %edx /* WB IO type */ -#endif -#if CacheSize == 0x1000 - movl $0x06000000, %edx /* WB IO type */ -#endif - xorl %eax, %eax - wrmsr - #else /* disable cache */ |