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/*
* This file is part of the coreboot project.
*
* 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.
*/
#include <stdlib.h>
#include <console/console.h>
#include <cbmem.h>
#include <arch/acpi.h>
#if IS_ENABLED(CONFIG_LATE_CBMEM_INIT)
#if !defined(__PRE_RAM__)
void __attribute__((weak)) backup_top_of_ram(uint64_t ramtop)
{
/* Do nothing. Chipset may have implementation to save ramtop in NVRAM.
*/
}
static void *ramtop_pointer;
void set_top_of_ram(uint64_t ramtop)
{
backup_top_of_ram(ramtop);
ramtop_pointer = (void *)(uintptr_t)ramtop;
}
static inline void *saved_ramtop(void)
{
return ramtop_pointer;
}
#else
static inline void *saved_ramtop(void)
{
return NULL;
}
#endif /* !__PRE_RAM__ */
unsigned long __attribute__((weak)) get_top_of_ram(void)
{
return 0;
}
void *cbmem_top(void)
{
/* Top of cbmem is at lowest usable DRAM address below 4GiB. */
void *ptr = saved_ramtop();
if (ptr != NULL)
return ptr;
return (void *)get_top_of_ram();
}
#endif /* LATE_CBMEM_INIT */
/* Something went wrong, our high memory area got wiped */
void cbmem_fail_resume(void)
{
#if !defined(__PRE_RAM__) && IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
/* ACPI resume needs to be cleared in the fail-to-recover case, but that
* condition is only handled during ramstage. */
acpi_fail_wakeup();
#endif
}
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