mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 02:38:56 +00:00
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>
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
/*
|
|
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/sfi.h>
|
|
#include <asm/mpspec.h>
|
|
#include <asm/tables.h>
|
|
|
|
u8 table_compute_checksum(void *v, int len)
|
|
{
|
|
u8 *bytes = v;
|
|
u8 checksum = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < len; i++)
|
|
checksum -= bytes[i];
|
|
|
|
return checksum;
|
|
}
|
|
|
|
void table_fill_string(char *dest, const char *src, size_t n, char pad)
|
|
{
|
|
int start, len;
|
|
int i;
|
|
|
|
strncpy(dest, src, n);
|
|
|
|
/* Fill the remaining bytes with pad */
|
|
len = strlen(src);
|
|
start = len < n ? len : n;
|
|
for (i = start; i < n; i++)
|
|
dest[i] = pad;
|
|
}
|
|
|
|
void write_tables(void)
|
|
{
|
|
u32 __maybe_unused rom_table_end = ROM_TABLE_ADDR;
|
|
|
|
#ifdef CONFIG_GENERATE_PIRQ_TABLE
|
|
rom_table_end = write_pirq_routing_table(rom_table_end);
|
|
rom_table_end = ALIGN(rom_table_end, 1024);
|
|
#endif
|
|
#ifdef CONFIG_GENERATE_SFI_TABLE
|
|
rom_table_end = write_sfi_table(rom_table_end);
|
|
rom_table_end = ALIGN(rom_table_end, 1024);
|
|
#endif
|
|
#ifdef CONFIG_GENERATE_MP_TABLE
|
|
rom_table_end = write_mp_table(rom_table_end);
|
|
rom_table_end = ALIGN(rom_table_end, 1024);
|
|
#endif
|
|
}
|