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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2006 Advanced Micro Devices, Inc.
* Copyright (C) 2008-2010 coresystems GmbH
* Copyright 2015 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.
*/
/* This file is included inside a SECTIONS block */
. = CONFIG_DCACHE_RAM_BASE;
.car.data . (NOLOAD) : {
_car_region_start = . ;
#if IS_ENABLED(CONFIG_PAGING_IN_CACHE_AS_RAM)
/* Page table pre-allocation. CONFIG_DCACHE_RAM_BASE should be 4KiB
* aligned when using this option. */
_pagetables = . ;
. += 4096 * CONFIG_NUM_CAR_PAGE_TABLE_PAGES;
_epagetables = . ;
#endif
/* Vboot work buffer is completely volatile outside of verstage and
* romstage. Appropriate code needs to handle the transition. */
#if IS_ENABLED(CONFIG_VBOOT_SEPARATE_VERSTAGE)
VBOOT2_WORK(., 16K)
#endif
/* Stack for CAR stages. Since it persists across all stages that
* use CAR it can be reused. The chipset/SoC is expected to provide
* the stack size. */
#if IS_ENABLED(CONFIG_C_ENVIRONMENT_BOOTBLOCK)
_car_stack_start = .;
. += CONFIG_DCACHE_BSP_STACK_SIZE;
_car_stack_end = .;
#endif
/* The pre-ram cbmem console as well as the timestamp region are fixed
* in size. Therefore place them at the beginning .car.data section
* so that multiple stages (romstage and verstage) have a consistent
* link address of these shared objects. */
PRERAM_CBMEM_CONSOLE(., CONFIG_PRERAM_CBMEM_CONSOLE_SIZE)
#if IS_ENABLED(CONFIG_PAGING_IN_CACHE_AS_RAM)
. = ALIGN(32);
/* Page directory pointer table resides here. There are 4 8-byte entries
* totalling 32 bytes that need to be 32-byte aligned. The reason the
* pdpt are not colocated with the rest of the page tables is to reduce
* fragmentation of the CAR space that persists across stages. */
_pdpt = .;
. += 32;
_epdpt = .;
#endif
_car_relocatable_data_start = .;
/* The timestamp implementation relies on this storage to be around
* after migration. One of the fields indicates not to use it as the
* backing store once cbmem comes online. Therefore, this data needs
* to reside in the migrated area (between _car_relocatable_data_start
* and _car_relocatable_data_end). */
TIMESTAMP(., 0x200)
#if IS_ENABLED(CONFIG_COMMONLIB_STORAGE)
_car_drivers_storage_start = .;
. += 256;
_car_drivers_storage_end = .;
#endif
/* _car_global_start and _car_global_end provide symbols to per-stage
* variables that are not shared like the timestamp and the pre-ram
* cbmem console. This is useful for clearing this area on a per-stage
* basis when more than one stage uses cache-as-ram for CAR_GLOBALs. */
_car_global_start = .;
#if IS_ENABLED(CONFIG_NO_CAR_GLOBAL_MIGRATION)
/* Allow global unitialized variables when CAR_GLOBALs are not used. */
*(.bss)
*(.bss.*)
*(.sbss)
*(.sbss.*)
#else
/* .car.global_data objects only around when
* !CONFIG_NO_CAR_GLOBAL_MIGRATION is employed. */
*(.car.global_data);
#endif
. = ALIGN(ARCH_POINTER_ALIGN_SIZE);
_car_global_end = .;
_car_relocatable_data_end = .;
_car_region_end = . + CONFIG_DCACHE_RAM_SIZE - (. - _car_region_start);
}
/* Global variables are not allowed in romstage
* This section is checked during stage creation to ensure
* that there are no global variables present
*/
. = 0xffffff00;
.illegal_globals . : {
*(EXCLUDE_FILE ("*/libagesa.*.a:" "*/romstage*/buildOpts.o" "*/romstage*/agesawrapper.o" "*/vendorcode/amd/agesa/*" "*/vendorcode/amd/cimx/*") .data)
*(EXCLUDE_FILE ("*/libagesa.*.a:" "*/romstage*/buildOpts.o" "*/romstage*/agesawrapper.o" "*/vendorcode/amd/agesa/*" "*/vendorcode/amd/cimx/*") .data.*)
#if !IS_ENABLED(CONFIG_NO_CAR_GLOBAL_MIGRATION)
*(.bss)
*(.bss.*)
*(.sbss)
*(.sbss.*)
#else
/* In case something sneaks through when it shouldn't. */
*(.car.global_data);
#endif
}
_bogus = ASSERT((CONFIG_DCACHE_RAM_SIZE == 0) || (SIZEOF(.car.data) <= CONFIG_DCACHE_RAM_SIZE), "Cache as RAM area is too full");
#if IS_ENABLED(CONFIG_PAGING_IN_CACHE_AS_RAM)
_bogus2 = ASSERT(_pagetables == ALIGN(_pagetables, 4096), "_pagetables aren't 4KiB aligned");
#endif
#if IS_ENABLED(CONFIG_C_ENVIRONMENT_BOOTBLOCK)
_bogus3 = ASSERT(CONFIG_DCACHE_BSP_STACK_SIZE > 0x0, "BSP stack size not configured");
#endif
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