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 /** 18 * table_compute_checksum() - Compute a table checksum 19 * 20 * This computes an 8-bit checksum for the configuration table. 21 * All bytes in the configuration table, including checksum itself and 22 * reserved bytes must add up to zero. 23 * 24 * @v: configuration table base address 25 * @len: configuration table size 26 * @return: the 8-bit checksum 27 */ 28 u8 table_compute_checksum(void *v, int len); 29 30 /** 31 * table_fill_string() - Fill a string with pad in the configuration table 32 * 33 * This fills a string in the configuration table. It copies number of bytes 34 * from the source string, and if source string length is shorter than the 35 * required size to copy, pad the table string with the given pad character. 36 * 37 * @dest: where to fill a string 38 * @src: where to copy from 39 * @n: number of bytes to copy 40 * @pad: character to pad the remaining bytes 41 */ 42 void table_fill_string(char *dest, const char *src, size_t n, char pad); 43 44 /** 45 * write_tables() - Write x86 configuration tables 46 * 47 * This writes x86 configuration tables, including PIRQ routing table, 48 * Multi-Processor table and ACPI table. Whether a specific type of 49 * configuration table is written is controlled by a Kconfig option. 50 */ 51 void write_tables(void); 52 53 /** 54 * write_pirq_routing_table() - Write PIRQ routing table 55 * 56 * This writes PIRQ routing table at a given address. 57 * 58 * @start: start address to write PIRQ routing table 59 * @return: end address of PIRQ routing table 60 */ 61 u32 write_pirq_routing_table(u32 start); 62 63 #endif /* _X86_TABLES_H_ */ 64