a165c07ed7
This enables the use of .bss section for ENV_BOOTBLOCK and ENV_VERSTAGE even with CAR_GLOBAL_MIGRATION=y. In practice, boards with CAR_GLOBAL_MIGRATION=y currently build with romcc-bootblock so they will not be using .bss. Change-Id: Ie9dc14f3e528d3e4f48304f4d7de50df448a8af6 Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/35016 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org>
127 lines
4.6 KiB
Text
127 lines
4.6 KiB
Text
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2006 Advanced Micro Devices, Inc.
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* Copyright (C) 2008-2010 coresystems GmbH
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* Copyright 2015 Google Inc
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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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/* This file is included inside a SECTIONS block */
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. = CONFIG_DCACHE_RAM_BASE;
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.car.data . (NOLOAD) : {
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_car_region_start = . ;
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#if CONFIG(PAGING_IN_CACHE_AS_RAM)
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/* Page table pre-allocation. CONFIG_DCACHE_RAM_BASE should be 4KiB
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* aligned when using this option. */
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_pagetables = . ;
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. += 4096 * CONFIG_NUM_CAR_PAGE_TABLE_PAGES;
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_epagetables = . ;
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#endif
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/* Vboot work buffer only needs to be available when verified boot
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* starts in bootblock. */
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#if CONFIG(VBOOT_STARTS_IN_BOOTBLOCK)
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VBOOT2_WORK(., 12K)
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#endif
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/* Vboot measured boot TCPA log measurements.
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* Needs to be transferred until CBMEM is available
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*/
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#if CONFIG(VBOOT_MEASURED_BOOT)
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VBOOT2_TPM_LOG(., 2K)
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#endif
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/* Stack for CAR stages. Since it persists across all stages that
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* use CAR it can be reused. The chipset/SoC is expected to provide
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* the stack size. */
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#if CONFIG(C_ENVIRONMENT_BOOTBLOCK)
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_car_stack_start = .;
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. += CONFIG_DCACHE_BSP_STACK_SIZE;
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_car_stack_end = .;
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#endif
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/* The pre-ram cbmem console as well as the timestamp region are fixed
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* in size. Therefore place them above the car global section so that
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* multiple stages (romstage and verstage) have a consistent
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* link address of these shared objects. */
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PRERAM_CBMEM_CONSOLE(., CONFIG_PRERAM_CBMEM_CONSOLE_SIZE)
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#if CONFIG(PAGING_IN_CACHE_AS_RAM)
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. = ALIGN(32);
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/* Page directory pointer table resides here. There are 4 8-byte entries
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* totalling 32 bytes that need to be 32-byte aligned. The reason the
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* pdpt are not colocated with the rest of the page tables is to reduce
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* fragmentation of the CAR space that persists across stages. */
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_pdpt = .;
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. += 32;
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_epdpt = .;
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#endif
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_car_relocatable_data_start = .;
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/* The timestamp implementation relies on this storage to be around
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* after migration. One of the fields indicates not to use it as the
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* backing store once cbmem comes online. Therefore, this data needs
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* to reside in the migrated area (between _car_relocatable_data_start
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* and _car_relocatable_data_end). */
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TIMESTAMP(., 0x200)
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_car_ehci_dbg_info_start = .;
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/* Reserve sizeof(struct ehci_dbg_info). */
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. += 80;
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_car_ehci_dbg_info_end = .;
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/* _car_global_start and _car_global_end provide symbols to per-stage
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* variables that are not shared like the timestamp and the pre-ram
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* cbmem console. This is useful for clearing this area on a per-stage
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* basis when more than one stage uses cache-as-ram for CAR_GLOBALs. */
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_car_global_start = .;
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#if ENV_STAGE_HAS_BSS_SECTION
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/* Allow global uninitialized variables for stages without CAR teardown. */
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*(.bss)
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*(.bss.*)
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*(.sbss)
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*(.sbss.*)
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#else
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/* .car.global_data objects only around when
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* CONFIG_CAR_GLOBAL_MIGRATION is employed. */
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*(.car.global_data);
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#endif
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. = ALIGN(ARCH_POINTER_ALIGN_SIZE);
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_car_global_end = .;
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_car_relocatable_data_end = .;
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#if !CONFIG(C_ENVIRONMENT_BOOTBLOCK)
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_car_stack_start = .;
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_car_stack_end = _car_region_end;
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#endif
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_car_region_end = . + CONFIG_DCACHE_RAM_SIZE - (. - _car_region_start);
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}
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/* Global variables are not allowed in romstage
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* This section is checked during stage creation to ensure
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* that there are no global variables present
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*/
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. = 0xffffff00;
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.illegal_globals . : {
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*(EXCLUDE_FILE ("*/libagesa.*.a:" "*/romstage*/buildOpts.o" "*/romstage*/agesawrapper.o" "*/vendorcode/amd/agesa/*" "*/vendorcode/amd/cimx/*") .data)
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*(EXCLUDE_FILE ("*/libagesa.*.a:" "*/romstage*/buildOpts.o" "*/romstage*/agesawrapper.o" "*/vendorcode/amd/agesa/*" "*/vendorcode/amd/cimx/*") .data.*)
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#if CONFIG(CAR_GLOBAL_MIGRATION)
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*(.bss)
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*(.bss.*)
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*(.sbss)
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*(.sbss.*)
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#else
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/* In case something sneaks through when it shouldn't. */
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*(.car.global_data);
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#endif
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}
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_bogus = ASSERT((CONFIG_DCACHE_RAM_SIZE == 0) || (SIZEOF(.car.data) <= CONFIG_DCACHE_RAM_SIZE), "Cache as RAM area is too full");
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#if CONFIG(PAGING_IN_CACHE_AS_RAM)
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_bogus2 = ASSERT(_pagetables == ALIGN(_pagetables, 4096), "_pagetables aren't 4KiB aligned");
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#endif
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#if CONFIG(C_ENVIRONMENT_BOOTBLOCK)
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_bogus3 = ASSERT(CONFIG_DCACHE_BSP_STACK_SIZE > 0x0, "BSP stack size not configured");
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#endif
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