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 /** 20 * table_compute_checksum() - Compute a table checksum 21 * 22 * This computes an 8-bit checksum for the configuration table. 23 * All bytes in the configuration table, including checksum itself and 24 * reserved bytes must add up to zero. 25 * 26 * @v: configuration table base address 27 * @len: configuration table size 28 * @return: the 8-bit checksum 29 */ 30 u8 table_compute_checksum(void *v, int len); 31 32 /** 33 * table_fill_string() - Fill a string with pad in the configuration table 34 * 35 * This fills a string in the configuration table. It copies number of bytes 36 * from the source string, and if source string length is shorter than the 37 * required size to copy, pad the table string with the given pad character. 38 * 39 * @dest: where to fill a string 40 * @src: where to copy from 41 * @n: number of bytes to copy 42 * @pad: character to pad the remaining bytes 43 */ 44 void table_fill_string(char *dest, const char *src, size_t n, char pad); 45 46 /** 47 * write_tables() - Write x86 configuration tables 48 * 49 * This writes x86 configuration tables, including PIRQ routing table, 50 * Multi-Processor table and ACPI table. Whether a specific type of 51 * configuration table is written is controlled by a Kconfig option. 52 */ 53 void write_tables(void); 54 55 /** 56 * write_pirq_routing_table() - Write PIRQ routing table 57 * 58 * This writes PIRQ routing table at a given address. 59 * 60 * @start: start address to write PIRQ routing table 61 * @return: end address of PIRQ routing table 62 */ 63 u32 write_pirq_routing_table(u32 start); 64 65 #endif /* _X86_TABLES_H_ */ 66