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https://github.com/brain-hackers/u-boot-brain
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07545d861c
Implement write_mp_table() to create a minimal working MP table. This includes an MP floating table, a configuration table header and all of the 5 base configuration table entries. The I/O interrupt assignment table entry is created based on the same information used in the creation of PIRQ routing table from device tree. A check duplicated entry logic is applied to prevent writing multiple I/O interrupt entries with the same information. Use a Kconfig option GENERATE_MP_TABLE to tell U-Boot whether we need actually write the MP table at the F seg, just like we did for PIRQ routing and SFI tables. With MP table existence, linux kernel will switch to I/O APIC and local APIC to process all the peripheral interrupts instead of 8259 PICs. This takes full advantage of the multicore hardware and the SMP kernel. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Acked-by: Simon Glass <sjg@chromium.org>
55 lines
1.1 KiB
C
55 lines
1.1 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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#include <common.h>
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#include <asm/sfi.h>
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#include <asm/mpspec.h>
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#include <asm/tables.h>
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u8 table_compute_checksum(void *v, int len)
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{
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u8 *bytes = v;
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u8 checksum = 0;
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int i;
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for (i = 0; i < len; i++)
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checksum -= bytes[i];
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return checksum;
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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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int start, len;
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int i;
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strncpy(dest, src, n);
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/* Fill the remaining bytes with pad */
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len = strlen(src);
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start = len < n ? len : n;
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for (i = start; i < n; i++)
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dest[i] = pad;
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}
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void write_tables(void)
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{
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u32 __maybe_unused rom_table_end = ROM_TABLE_ADDR;
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#ifdef CONFIG_GENERATE_PIRQ_TABLE
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rom_table_end = write_pirq_routing_table(rom_table_end);
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rom_table_end = ALIGN(rom_table_end, 1024);
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#endif
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#ifdef CONFIG_GENERATE_SFI_TABLE
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rom_table_end = write_sfi_table(rom_table_end);
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rom_table_end = ALIGN(rom_table_end, 1024);
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#endif
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#ifdef CONFIG_GENERATE_MP_TABLE
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rom_table_end = write_mp_table(rom_table_end);
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rom_table_end = ALIGN(rom_table_end, 1024);
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#endif
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}
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