mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 07:34:31 +00:00
3cf23719b1
SeaBIOS is an open source implementation of a 16-bit x86 BIOS. It can run in an emulator or natively on x86 hardware with the use of coreboot. With SeaBIOS's help, we can boot some OSes that require 16-bit BIOS services like Windows/DOS. As U-Boot, we have to manually create a table where SeaBIOS gets system information (eg: E820) from. The table unfortunately has to follow the coreboot table format as SeaBIOS currently supports booting as a coreboot payload. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
68 lines
2 KiB
C
68 lines
2 KiB
C
/*
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* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _X86_TABLES_H_
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#define _X86_TABLES_H_
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/*
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* All x86 tables happen to like the address range from 0xf0000 to 0x100000.
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* We use 0xf0000 as the starting address to store those tables, including
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* PIRQ routing table, Multi-Processor table and ACPI table.
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*/
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#define ROM_TABLE_ADDR 0xf0000
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#define ROM_TABLE_ALIGN 1024
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/* SeaBIOS expects coreboot tables at address range 0x0000-0x1000 */
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#define CB_TABLE_ADDR 0x800
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/**
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* table_compute_checksum() - Compute a table checksum
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*
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* This computes an 8-bit checksum for the configuration table.
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* All bytes in the configuration table, including checksum itself and
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* reserved bytes must add up to zero.
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*
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* @v: configuration table base address
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* @len: configuration table size
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* @return: the 8-bit checksum
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*/
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u8 table_compute_checksum(void *v, int len);
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/**
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* table_fill_string() - Fill a string with pad in the configuration table
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*
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* This fills a string in the configuration table. It copies number of bytes
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* from the source string, and if source string length is shorter than the
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* required size to copy, pad the table string with the given pad character.
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*
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* @dest: where to fill a string
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* @src: where to copy from
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* @n: number of bytes to copy
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* @pad: character to pad the remaining bytes
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*/
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void table_fill_string(char *dest, const char *src, size_t n, char pad);
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/**
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* write_tables() - Write x86 configuration tables
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*
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* This writes x86 configuration tables, including PIRQ routing table,
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* Multi-Processor table and ACPI table. Whether a specific type of
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* configuration table is written is controlled by a Kconfig option.
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*/
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void write_tables(void);
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/**
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* write_pirq_routing_table() - Write PIRQ routing table
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*
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* This writes PIRQ routing table at a given address.
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*
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* @start: start address to write PIRQ routing table
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* @return: end address of PIRQ routing table
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*/
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u32 write_pirq_routing_table(u32 start);
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#endif /* _X86_TABLES_H_ */
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