diff options
Diffstat (limited to 'src/soc/amd/common/block/cpu')
| -rw-r--r-- | src/soc/amd/common/block/cpu/Kconfig | 8 | ||||
| -rw-r--r-- | src/soc/amd/common/block/cpu/Makefile.inc | 2 | ||||
| -rw-r--r-- | src/soc/amd/common/block/cpu/car/cache_as_ram.S | 59 | ||||
| -rw-r--r-- | src/soc/amd/common/block/cpu/car/exit_car.S | 36 |
4 files changed, 105 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/cpu/Kconfig b/src/soc/amd/common/block/cpu/Kconfig new file mode 100644 index 0000000000..86cc77194c --- /dev/null +++ b/src/soc/amd/common/block/cpu/Kconfig @@ -0,0 +1,8 @@ +config SOC_AMD_COMMON_BLOCK_CAR + bool + default n + help + This option allows the SOC to use a standard AMD cache-as-ram (CAR) + implementation. CAR setup is built into bootblock and teardown in + romstage. If it is not used the system must implement these functions + separately. diff --git a/src/soc/amd/common/block/cpu/Makefile.inc b/src/soc/amd/common/block/cpu/Makefile.inc new file mode 100644 index 0000000000..8e6972ed0a --- /dev/null +++ b/src/soc/amd/common/block/cpu/Makefile.inc @@ -0,0 +1,2 @@ +bootblock-$(CONFIG_SOC_AMD_COMMON_BLOCK_CAR) += car/cache_as_ram.S +romstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_CAR) += car/exit_car.S diff --git a/src/soc/amd/common/block/cpu/car/cache_as_ram.S b/src/soc/amd/common/block/cpu/car/cache_as_ram.S new file mode 100644 index 0000000000..402da3acb6 --- /dev/null +++ b/src/soc/amd/common/block/cpu/car/cache_as_ram.S @@ -0,0 +1,59 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2011 Advanced Micro Devices, Inc. + * + * 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. + */ + +/****************************************************************************** + * $Workfile:: cache_as_ram.S + * + * Description: CAR setup called from bootblock_crt0.S. + * + ****************************************************************************** + */ + +#include "gcccar.inc" +#include <cpu/x86/cache.h> +#include <cpu/x86/post_code.h> + +/* + * on entry: + * mm0: BIST (ignored) + * mm2_mm1: timestamp at bootblock_protected_mode_entry + */ + +.global bootblock_pre_c_entry +bootblock_pre_c_entry: + + post_code(0xa0) + + AMD_ENABLE_STACK + + /* Align the stack and keep aligned for call to bootblock_c_entry() */ + and $0xfffffff0, %esp + sub $8, %esp + + movd %mm2, %eax + pushl %eax /* tsc[63:32] */ + movd %mm1, %eax + pushl %eax /* tsc[31:0] */ + +before_carstage: + post_code(0xa2) + + call bootblock_c_entry + /* Never reached */ + +.halt_forever: + post_code(POST_DEAD_CODE) + hlt + jmp .halt_forever diff --git a/src/soc/amd/common/block/cpu/car/exit_car.S b/src/soc/amd/common/block/cpu/car/exit_car.S new file mode 100644 index 0000000000..ac36cb0e4f --- /dev/null +++ b/src/soc/amd/common/block/cpu/car/exit_car.S @@ -0,0 +1,36 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2011 Advanced Micro Devices, Inc. + * + * 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 <gcccar.inc> +#include <cpu/x86/cache.h> + +.code32 +.globl chipset_teardown_car + +chipset_teardown_car: + + /* Disable cache */ + movl %cr0, %eax + orl $CR0_CacheDisable, %eax + movl %eax, %cr0 + + AMD_DISABLE_STACK + + /* enable cache */ + movl %cr0, %eax + andl $(~(CR0_CD | CR0_NW)), %eax + movl %eax, %cr0 + + ret |