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https://github.com/brain-hackers/u-boot-brain
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![Lukas Auer](/assets/img/avatar_default.png)
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>
21 lines
427 B
C
21 lines
427 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*
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* From arch/x86/lib/asm-offsets.c
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*
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* This program is used to generate definitions needed by
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* assembly language modules.
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*/
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#include <common.h>
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#include <linux/kbuild.h>
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int main(void)
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{
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DEFINE(GD_BOOT_HART, offsetof(gd_t, arch.boot_hart));
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DEFINE(GD_AVAILABLE_HARTS, offsetof(gd_t, arch.available_harts));
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return 0;
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}
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