u-boot/arch/riscv/lib/asm-offsets.c
Lukas Auer 3dea63c844 riscv: add support for multi-hart systems
On RISC-V, all harts boot independently. To be able to run on a
multi-hart system, U-Boot must be extended with the functionality to
manage all harts in the system. All harts entering U-Boot are registered
in the available_harts mask stored in global data. A hart lottery system
as used in the Linux kernel selects the hart U-Boot runs on. All other
harts are halted. U-Boot can delegate functions to them using
smp_call_function().

Every hart has a valid pointer to the global data structure and a 8KiB
stack by default. The stack size is set with CONFIG_STACK_SIZE_SHIFT.

Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
2019-04-08 09:44:26 +08:00

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C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
*
* From arch/x86/lib/asm-offsets.c
*
* This program is used to generate definitions needed by
* assembly language modules.
*/
#include <common.h>
#include <linux/kbuild.h>
int main(void)
{
DEFINE(GD_BOOT_HART, offsetof(gd_t, arch.boot_hart));
DEFINE(GD_AVAILABLE_HARTS, offsetof(gd_t, arch.available_harts));
return 0;
}