diff options
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/cpu/x86/Kconfig | 9 | ||||
| -rw-r--r-- | src/cpu/x86/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/cpu/x86/car.c | 101 |
4 files changed, 112 insertions, 0 deletions
diff --git a/src/cpu/Makefile.inc b/src/cpu/Makefile.inc index b48a803795..8d93756390 100644 --- a/src/cpu/Makefile.inc +++ b/src/cpu/Makefile.inc @@ -6,6 +6,7 @@ subdirs-y += armltd subdirs-y += intel subdirs-y += samsung subdirs-y += via +subdirs-y += x86 ################################################################################ ## Rules for building the microcode blob in CBFS diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig index c64a8e477b..c10dd1579f 100644 --- a/src/cpu/x86/Kconfig +++ b/src/cpu/x86/Kconfig @@ -115,3 +115,12 @@ config X86_AMD_FIXED_MTRRS help This option informs the MTRR code to use the RdMem and WrMem fields in the fixed MTRR MSRs. + +config CAR_MIGRATION + def_bool n + depends on DYNAMIC_CBMEM || EARLY_CBMEM_INIT + help + Migrate the cache-as-ram variables to CBMEM once CBMEM is set up + in romstage. This option is only needed if one will be doing more + work in romstage after the cache-as-ram is torn down aside from + loading ramstage. diff --git a/src/cpu/x86/Makefile.inc b/src/cpu/x86/Makefile.inc new file mode 100644 index 0000000000..fe8648cc49 --- /dev/null +++ b/src/cpu/x86/Makefile.inc @@ -0,0 +1 @@ +romstage-$(CONFIG_CAR_MIGRATION) += car.c diff --git a/src/cpu/x86/car.c b/src/cpu/x86/car.c new file mode 100644 index 0000000000..31fc67c57a --- /dev/null +++ b/src/cpu/x86/car.c @@ -0,0 +1,101 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Google, 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. + * + * 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 <string.h> +#include <stddef.h> +#include <console/console.h> +#include <cbmem.h> +#include <cpu/x86/car.h> + +typedef void (* const car_migration_func_t)(void); + +extern car_migration_func_t _car_migrate_start; +extern car_migration_func_t _car_migrate_end; + +extern char _car_data_start[]; +extern char _car_data_end[]; + +/* + * The car_migrated global variable determines if the cache-as-ram space has + * been migrated to real RAM. It does this by asumming the following things: + * 1. cache-as-ram space is zero'd out once it is set up. + * 2. Either the cache-as-ram space is memory-backed after getting torn down + * or the space returns 0xff's for each byte read. + * Based on these 2 attributes there is the ability to tell when the + * cache-as-ram region has been migrated. + */ +static int car_migrated CAR_GLOBAL; + + +void *car_get_var_ptr(void *var) +{ + char *migrated_base; + int offset; + void * _car_start = &_car_data_start; + void * _car_end = &_car_data_end; + + /* If the cache-as-ram has not been migrated return the pointer + * passed in. */ + if (!car_migrated) + return var; + + if (var < _car_start || var >= _car_end) { + printk(BIOS_ERR, + "Requesting CAR variable outside of CAR region: %p\n", + var); + return var; + } + + migrated_base = cbmem_find(CBMEM_ID_CAR_GLOBALS); + + if (migrated_base == NULL) { + printk(BIOS_ERR, "CAR: Could not find migration base!\n"); + return var; + } + + offset = (char *)var - (char *)_car_start; + + return &migrated_base[offset]; +} + +void car_migrate_variables(void) +{ + void *migrated_base; + car_migration_func_t *migrate_func; + size_t car_data_size = &_car_data_end[0] - &_car_data_start[0]; + + migrated_base = cbmem_add(CBMEM_ID_CAR_GLOBALS, car_data_size); + + if (migrated_base == NULL) { + printk(BIOS_ERR, "Could not migrate CAR data!\n"); + return; + } + + memcpy(migrated_base, &_car_data_start[0], car_data_size); + + /* Mark that the data has been moved. */ + car_migrated = ~0; + + /* Call all the migration functions. */ + migrate_func = &_car_migrate_start; + while (migrate_func != &_car_migrate_end) { + (*migrate_func)(); + migrate_func++; + } +} |