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| author | Bin Meng <bmeng.cn@gmail.com> | 2015-06-23 12:18:52 +0800 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-07-14 18:03:17 -0600 |
| commit | 07545d861ccc54aecbeaa51b264258b90912b856 (patch) | |
| tree | 3e64d07fec4397bf2b7dc0433ca74b184b6c3318 /arch/x86/include | |
| parent | 7f5df8d42d8eb0fbdb6bf168fd530aa0f01b99c7 (diff) | |
| download | u-boot-imx-07545d861ccc54aecbeaa51b264258b90912b856.zip u-boot-imx-07545d861ccc54aecbeaa51b264258b90912b856.tar.gz u-boot-imx-07545d861ccc54aecbeaa51b264258b90912b856.tar.bz2 | |
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>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/mpspec.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h index 849113a..efa9231 100644 --- a/arch/x86/include/asm/mpspec.h +++ b/arch/x86/include/asm/mpspec.h @@ -431,4 +431,14 @@ void mp_write_compat_address_space(struct mp_config_table *mc, int busid, */ u32 mptable_finalize(struct mp_config_table *mc); +/** + * write_mp_table() - Write MP table + * + * This writes MP table at a given address. + * + * @addr: start address to write MP table + * @return: end address of MP table + */ +u32 write_mp_table(u32 addr); + #endif /* __ASM_MPSPEC_H */ |