1 /* 2 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #ifndef _X86_TABLES_H_ 8 #define _X86_TABLES_H_ 9 10 /* 11 * All x86 tables happen to like the address range from 0xf0000 to 0x100000. 12 * We use 0xf0000 as the starting address to store those tables, including 13 * PIRQ routing table, Multi-Processor table and ACPI table. 14 */ 15 #define ROM_TABLE_ADDR 0xf0000 16 17 #define ROM_TABLE_ALIGN 1024 18 19 /* SeaBIOS expects coreboot tables at address range 0x0000-0x1000 */ 20 #define CB_TABLE_ADDR 0x800 21 22 /** 23 * table_compute_checksum() - Compute a table checksum 24 * 25 * This computes an 8-bit checksum for the configuration table. 26 * All bytes in the configuration table, including checksum itself and 27 * reserved bytes must add up to zero. 28 * 29 * @v: configuration table base address 30 * @len: configuration table size 31 * @return: the 8-bit checksum 32 */ 33 u8 table_compute_checksum(void *v, int len); 34 35 /** 36 * table_fill_string() - Fill a string with pad in the configuration table 37 * 38 * This fills a string in the configuration table. It copies number of bytes 39 * from the source string, and if source string length is shorter than the 40 * required size to copy, pad the table string with the given pad character. 41 * 42 * @dest: where to fill a string 43 * @src: where to copy from 44 * @n: number of bytes to copy 45 * @pad: character to pad the remaining bytes 46 */ 47 void table_fill_string(char *dest, const char *src, size_t n, char pad); 48 49 /** 50 * write_tables() - Write x86 configuration tables 51 * 52 * This writes x86 configuration tables, including PIRQ routing table, 53 * Multi-Processor table and ACPI table. Whether a specific type of 54 * configuration table is written is controlled by a Kconfig option. 55 */ 56 void write_tables(void); 57 58 /** 59 * write_pirq_routing_table() - Write PIRQ routing table 60 * 61 * This writes PIRQ routing table at a given address. 62 * 63 * @start: start address to write PIRQ routing table 64 * @return: end address of PIRQ routing table 65 */ 66 u32 write_pirq_routing_table(u32 start); 67 68 #endif /* _X86_TABLES_H_ */ 69