forked from Mirrors/opensbi
5c429ae213
To implement the SBI SRST extension, we need two platform operations for system reset: 1) system_reset_check() - This operation will check whether given reset type and reason are supported by the platform 2) system_reset() - This operation will do the actual platform system reset and it will not return if reset type and reason are supported by the platform This patch updates system reset related code everywhere as-per above. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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* Nick Kossifidis <mick@ics.forth.gr>
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*/
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#include <sbi/riscv_asm.h>
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#include <sbi/sbi_bitops.h>
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#include <sbi/sbi_domain.h>
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#include <sbi/sbi_hart.h>
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#include <sbi/sbi_hsm.h>
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#include <sbi/sbi_platform.h>
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#include <sbi/sbi_system.h>
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#include <sbi/sbi_ipi.h>
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#include <sbi/sbi_init.h>
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bool sbi_system_reset_supported(u32 reset_type, u32 reset_reason)
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{
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if (sbi_platform_system_reset_check(sbi_platform_thishart_ptr(),
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reset_type, reset_reason))
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return TRUE;
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return FALSE;
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}
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void __noreturn sbi_system_reset(u32 reset_type, u32 reset_reason)
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{
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ulong hbase = 0, hmask;
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u32 cur_hartid = current_hartid();
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struct sbi_domain *dom = sbi_domain_thishart_ptr();
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struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
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/* Send HALT IPI to every hart other than the current hart */
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while (!sbi_hsm_hart_started_mask(dom, hbase, &hmask)) {
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if (hbase <= cur_hartid)
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hmask &= ~(1UL << (cur_hartid - hbase));
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if (hmask)
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sbi_ipi_send_halt(hmask, hbase);
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hbase += BITS_PER_LONG;
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}
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/* Stop current HART */
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sbi_hsm_hart_stop(scratch, FALSE);
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/* Platform specific reset if domain allowed system reset */
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if (dom->system_reset_allowed)
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sbi_platform_system_reset(sbi_platform_ptr(scratch),
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reset_type, reset_reason);
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/* If platform specific reset did not work then do sbi_exit() */
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sbi_exit(scratch);
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}
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