142 lines
3.7 KiB
C
142 lines
3.7 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <string.h>
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#include <stddef.h>
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#include <console/console.h>
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#include <cbmem.h>
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#include <arch/early_variables.h>
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#include <symbols.h>
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#if CONFIG(PLATFORM_USES_FSP1_0)
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#include <drivers/intel/fsp1_0/fsp_util.h>
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#endif
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typedef void (* const car_migration_func_t)(void);
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extern car_migration_func_t _car_migrate_start;
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/*
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* The car_migrated global variable determines if the cache-as-ram space has
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* been migrated to real RAM. It does this by assuming the following things:
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* 1. cache-as-ram space is zero'd out once it is set up.
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* 2. Either the cache-as-ram space is memory-backed after getting torn down
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* or the space returns 0xff's for each byte read.
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* Based on these 2 attributes there is the ability to tell when the
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* cache-as-ram region has been migrated.
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*/
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static int car_migrated CAR_GLOBAL;
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/** @brief returns pointer to a CAR variable, before or after migration.
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*
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* @param var pointer to the CAR variable
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*/
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void *car_get_var_ptr(void *var)
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{
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char *migrated_base = NULL;
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int offset;
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void *_car_start = _car_relocatable_data_start;
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void *_car_end = _car_relocatable_data_end;
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/* If the cache-as-ram has not been migrated return the pointer
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* passed in. */
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if (!car_migrated)
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return var;
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if (var < _car_start || var >= _car_end) {
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printk(BIOS_ERR,
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"Requesting CAR variable outside of CAR region: %p\n",
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var);
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return var;
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}
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#if CONFIG(PLATFORM_USES_FSP1_0)
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migrated_base = (char *)find_saved_temp_mem(
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*(void **)CBMEM_FSP_HOB_PTR);
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/* FSP 1.0 migrates the entire DCACHE RAM */
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offset = (char *)var - (char *)CONFIG_DCACHE_RAM_BASE;
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#else
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migrated_base = cbmem_find(CBMEM_ID_CAR_GLOBALS);
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offset = (char *)var - (char *)_car_start;
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#endif
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if (migrated_base == NULL)
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die("CAR: Could not find migration base!\n");
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return &migrated_base[offset];
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}
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#if CONFIG(PLATFORM_USES_FSP1_0)
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/*
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* When a CAR_GLOBAL points to target object inside CAR, use relative
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* addressing. Such CAR_GLOBAL has to be expicitly accessed using
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* car_set_reloc_ptr() and car_get_reloc_ptr() as the stored value is now
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* an offset instead of the absolute address (pointer) of the target.
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*
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* This way discovery of objects that are not CAR_GLOBALs themselves,
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* remain discoverable after CAR migration has implicitly happened.
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*/
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void car_set_reloc_ptr(void *var, void *val)
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{
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uintptr_t *offset = car_get_var_ptr(var);
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*offset = 0;
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if (val)
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*offset = (uintptr_t)offset - (uintptr_t)val;
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}
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void *car_get_reloc_ptr(void *var)
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{
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uintptr_t *offset = car_get_var_ptr(var);
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void *val = NULL;
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if (*offset)
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val = (void *)((uintptr_t)offset - *offset);
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return val;
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}
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#endif
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int car_active(void)
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{
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return !car_migrated;
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}
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static void do_car_migrate_variables(void)
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{
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void *migrated_base;
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size_t car_size = car_data_size();
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/* Check if already migrated. */
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if (car_migrated)
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return;
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migrated_base = cbmem_add(CBMEM_ID_CAR_GLOBALS, car_size);
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if (migrated_base == NULL) {
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printk(BIOS_ERR, "Could not migrate CAR data!\n");
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return;
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}
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memcpy(migrated_base, _car_relocatable_data_start, car_size);
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/* Mark that the data has been moved. */
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car_migrated = ~0;
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}
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static void car_migrate_variables(int is_recovery)
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{
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if (!CONFIG(PLATFORM_USES_FSP1_0))
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do_car_migrate_variables();
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}
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ROMSTAGE_CBMEM_INIT_HOOK(car_migrate_variables)
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