/* * This file is part of the coreboot project. * * Copyright (C) 2014 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. */ #ifndef BOOTMEM_H #define BOOTMEM_H #include <memrange.h> #include <stdint.h> #include <boot/coreboot_tables.h> /** * Bootmem types match to LB_MEM tags, except for the following: * BM_MEM_RAMSTAGE : Memory where any kind of boot firmware resides and that * should not be touched by bootmem (by example: stack, * TTB, program, ...). * BM_MEM_PAYLOAD : Memory where any kind of payload resides and that should * not be touched by bootmem. * Start at 0x10000 to make sure that the caller doesn't provide LB_MEM tags. */ enum bootmem_type { BM_MEM_FIRST = 0x10000, /* First entry in this list */ BM_MEM_RAM, /* Memory anyone can use */ BM_MEM_RESERVED, /* Don't use this memory region */ BM_MEM_ACPI, /* ACPI Tables */ BM_MEM_NVS, /* ACPI NVS Memory */ BM_MEM_UNUSABLE, /* Unusable address space */ BM_MEM_VENDOR_RSVD, /* Vendor Reserved */ BM_MEM_TABLE, /* Ram configuration tables are kept in */ /* Tags below this point are ignored for the OS table. */ BM_MEM_OS_CUTOFF = BM_MEM_TABLE, BM_MEM_RAMSTAGE, BM_MEM_PAYLOAD, BM_MEM_LAST, /* Last entry in this list */ }; /** * Write memory coreboot table. Current resource map is serialized into * memtable (LB_MEM_* types). bootmem library is unusable until this function * is called first in the write tables path before payload is loaded. * * Bootmem types match to LB_MEM tags, except for the following: * BM_MEM_RAMSTAGE : Translates to LB_MEM_RAM. * BM_MEM_PAYLOAD : Translates to LB_MEM_RAM. */ void bootmem_write_memory_table(struct lb_memory *mem); /* Architecture hook to add bootmem areas the architecture controls when * bootmem_write_memory_table() is called. */ void bootmem_arch_add_ranges(void); /* Platform hook to add bootmem areas the platform / board controls. */ void bootmem_platform_add_ranges(void); /* Add a range of a given type to the bootmem address space. */ void bootmem_add_range(uint64_t start, uint64_t size, const enum bootmem_type tag); /* Print current range map of boot memory. */ void bootmem_dump_ranges(void); typedef bool (*range_action_t)(const struct range_entry *r, void *arg); /** * Walk memory tables from OS point of view and call the provided function, * for every region. The caller has to return false to break out of the loop any * time, or return true to continue. * * @param action The function to call for each memory range. * @param arg Pointer passed to function @action. Set to NULL if unused. * @return true if the function 'action' returned false. */ bool bootmem_walk_os_mem(range_action_t action, void *arg); /** * Walk memory tables and call the provided function, for every region. * The caller has to return false to break out of the loop any time, or * return true to continue. * * @param action The function to call for each memory range. * @param arg Pointer passed to function @action. Set to NULL if unused. * @return true if the function 'action' returned false. */ bool bootmem_walk(range_action_t action, void *arg); /* Return 1 if region targets usable RAM, 0 otherwise. */ int bootmem_region_targets_usable_ram(uint64_t start, uint64_t size); /* Allocate a temporary buffer from the unused RAM areas. */ void *bootmem_allocate_buffer(size_t size); #endif /* BOOTMEM_H */