x86: Generate a valid MultiProcessor (MP) table
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>
diff --git a/arch/x86/lib/tables.c b/arch/x86/lib/tables.c
index 41c50bc..75ffbc1 100644
--- a/arch/x86/lib/tables.c
+++ b/arch/x86/lib/tables.c
@@ -6,6 +6,7 @@
#include <common.h>
#include <asm/sfi.h>
+#include <asm/mpspec.h>
#include <asm/tables.h>
u8 table_compute_checksum(void *v, int len)
@@ -46,4 +47,8 @@
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
}