| /* |
| * 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 |
| } |