77 lines
1.8 KiB
C
77 lines
1.8 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc.
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*/
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#include <stdlib.h>
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#include <console/console.h>
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#include <cbmem.h>
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#include <arch/acpi.h>
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#if IS_ENABLED(CONFIG_LATE_CBMEM_INIT)
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#if !defined(__PRE_RAM__)
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void __attribute__((weak)) backup_top_of_ram(uint64_t ramtop)
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{
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/* Do nothing. Chipset may have implementation to save ramtop in NVRAM. */
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}
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static void *ramtop_pointer;
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void set_top_of_ram(uint64_t ramtop)
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{
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backup_top_of_ram(ramtop);
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ramtop_pointer = (void *)(uintptr_t)ramtop;
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}
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static inline void *saved_ramtop(void)
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{
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return ramtop_pointer;
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}
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#else
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static inline void *saved_ramtop(void)
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{
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return NULL;
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}
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#endif /* !__PRE_RAM__ */
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unsigned long __attribute__((weak)) get_top_of_ram(void)
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{
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return 0;
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}
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void *cbmem_top(void)
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{
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/* Top of cbmem is at lowest usable DRAM address below 4GiB. */
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void *ptr = saved_ramtop();
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if (ptr != NULL)
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return ptr;
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return (void *)get_top_of_ram();
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}
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#endif /* LATE_CBMEM_INIT */
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/* Something went wrong, our high memory area got wiped */
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void cbmem_fail_resume(void)
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{
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#if !defined(__PRE_RAM__) && IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
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/* ACPI resume needs to be cleared in the fail-to-recover case, but that
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* condition is only handled during ramstage. */
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acpi_fail_wakeup();
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#endif
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}
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