diff options
| -rw-r--r-- | src/arch/x86/init/romstage.ld | 12 | ||||
| -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 | ||||
| -rw-r--r-- | src/include/cbmem.h | 1 | ||||
| -rw-r--r-- | src/include/cpu/x86/car.h | 29 | ||||
| -rw-r--r-- | src/lib/cbmem.c | 4 | ||||
| -rw-r--r-- | src/lib/cbmem_info.c | 1 | ||||
| -rw-r--r-- | src/lib/dynamic_cbmem.c | 9 |
10 files changed, 168 insertions, 0 deletions
diff --git a/src/arch/x86/init/romstage.ld b/src/arch/x86/init/romstage.ld index 88c56573ae..f44185f24e 100644 --- a/src/arch/x86/init/romstage.ld +++ b/src/arch/x86/init/romstage.ld @@ -35,6 +35,10 @@ SECTIONS *(.rodata.*); *(.rom.data.*); . = ALIGN(16); + _car_migrate_start = .; + *(.car.migrate); + _car_migrate_end = .; + . = ALIGN(16); _erom = .; } @@ -48,8 +52,16 @@ SECTIONS . = CONFIG_DCACHE_RAM_BASE; .car.data . (NOLOAD) : { + _car_data_start = .; *(.car.global_data); + /* The cbmem_console section comes last to take advantage of + * a zero-sized array to hold the memconsole contents that + * grows to a bound of CONFIG_CONSOLE_CAR_BUFFER_SIZE. However, + * collisions within the cache-as-ram region cannot be + * statically checked because the cache-as-ram region usage is + * cpu/chipset dependent. */ *(.car.cbmem_console); + _car_data_end = .; } _bogus = ASSERT((SIZEOF(.car.data) <= CONFIG_DCACHE_RAM_SIZE), "Cache as RAM area is too full"); 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++; + } +} diff --git a/src/include/cbmem.h b/src/include/cbmem.h index 67cb1cb7e5..baec780156 100644 --- a/src/include/cbmem.h +++ b/src/include/cbmem.h @@ -69,6 +69,7 @@ #define CBMEM_ID_RAMSTAGE_CACHE 0x9a3ca54e #define CBMEM_ID_ROOT 0xff4007ff #define CBMEM_ID_VBOOT_HANDOFF 0x780074f0 +#define CBMEM_ID_CAR_GLOBALS 0xcac4e6a3 #define CBMEM_ID_NONE 0x00000000 #ifndef __ASSEMBLER__ diff --git a/src/include/cpu/x86/car.h b/src/include/cpu/x86/car.h index 2d2af03a37..7b5cedf213 100644 --- a/src/include/cpu/x86/car.h +++ b/src/include/cpu/x86/car.h @@ -28,4 +28,33 @@ #define CAR_CBMEM #endif +#if CONFIG_CAR_MIGRATION && defined(__PRE_RAM__) +#define CAR_MIGRATE_ATTR __attribute__ ((used,section (".car.migrate"))) + +/* Call migrate_fn_() when CAR globals are migrated. */ +#define CAR_MIGRATE(migrate_fn_) \ + static void (* const migrate_fn_ ## _ptr)(void) CAR_MIGRATE_ATTR = \ + migrate_fn_; + +/* Get the correct pointer for the CAR global variable. */ +void *car_get_var_ptr(void *var); + +/* Get and set a primitive type global variable. */ +#define car_get_var(var) \ + *(typeof(var) *)car_get_var_ptr(&(var)) +#define car_set_var(var, val) \ + do { car_get_var(var) = (val); } while(0) + +/* Migrate the CAR variables to memory. */ +void car_migrate_variables(void); + +#else +#define CAR_MIGRATE(migrate_fn_) +static inline void *car_get_var_ptr(void *var) { return var; } +#define car_get_var(var) (var) +#define car_set_var(var, val) do { (var) = (val); } while (0) +static inline void car_migrate_variables(void) { } +#endif + + #endif diff --git a/src/lib/cbmem.c b/src/lib/cbmem.c index e8200b6045..3702da1e1d 100644 --- a/src/lib/cbmem.c +++ b/src/lib/cbmem.c @@ -22,6 +22,7 @@ #include <bootstate.h> #include <cbmem.h> #include <console/console.h> +#include <cpu/x86/car.h> #if CONFIG_HAVE_ACPI_RESUME && !defined(__PRE_RAM__) #include <arch/acpi.h> #endif @@ -228,6 +229,9 @@ int cbmem_initialize(void) #ifndef __PRE_RAM__ cbmem_arch_init(); #endif + /* Migrate cache-as-ram variables. */ + car_migrate_variables(); + return rv; } #endif diff --git a/src/lib/cbmem_info.c b/src/lib/cbmem_info.c index ad8c890666..7031a70d54 100644 --- a/src/lib/cbmem_info.c +++ b/src/lib/cbmem_info.c @@ -46,6 +46,7 @@ static struct cbmem_id_to_name { { CBMEM_ID_RAMSTAGE_CACHE, "RAMSTAGE $ " }, { CBMEM_ID_ROOT, "CBMEM ROOT " }, { CBMEM_ID_VBOOT_HANDOFF, "VBOOT " }, + { CBMEM_ID_CAR_GLOBALS, "CAR GLOBALS" }, }; void cbmem_print_entry(int n, u32 id, u64 base, u64 size) diff --git a/src/lib/dynamic_cbmem.c b/src/lib/dynamic_cbmem.c index 5c269a0282..ba7760dcd1 100644 --- a/src/lib/dynamic_cbmem.c +++ b/src/lib/dynamic_cbmem.c @@ -23,6 +23,7 @@ #include <cbmem.h> #include <string.h> #include <stdlib.h> +#include <cpu/x86/car.h> #if CONFIG_HAVE_ACPI_RESUME && !defined(__PRE_RAM__) #include <arch/acpi.h> #endif @@ -182,12 +183,17 @@ void cbmem_initialize_empty(void) root, root->max_entries); cbmem_arch_init(); + + /* Migrate cache-as-ram variables. */ + car_migrate_variables(); } static inline int cbmem_fail_recovery(void) { cbmem_initialize_empty(); cbmem_handle_acpi_resume(); + /* Migrate cache-as-ram variables. */ + car_migrate_variables(); return 1; } @@ -256,6 +262,9 @@ int cbmem_initialize(void) cbmem_arch_init(); + /* Migrate cache-as-ram variables. */ + car_migrate_variables(); + /* Recovery successful. */ return 0; } |