forked from Mirrors/opensbi
74756891cc
This patch implements the SBI HSM suspend function. Using this new SBI call, the S-mode software can put calling HART in platform specific suspend (i.e. low-power) state. For a successful retentive suspend, the SBI call will return without errors upon resuming whereas for a successful non-retentive suspend, the SBI call will resume from a user provided resume address. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
62 lines
1.5 KiB
C
62 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) 2020 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Atish Patra <atish.patra@wdc.com>
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*/
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#include <sbi/sbi_domain.h>
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#include <sbi/sbi_ecall.h>
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#include <sbi/sbi_ecall_interface.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_trap.h>
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#include <sbi/sbi_version.h>
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#include <sbi/sbi_hsm.h>
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#include <sbi/sbi_scratch.h>
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#include <sbi/riscv_asm.h>
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static int sbi_ecall_hsm_handler(unsigned long extid, unsigned long funcid,
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const struct sbi_trap_regs *regs,
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unsigned long *out_val,
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struct sbi_trap_info *out_trap)
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{
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int ret = 0;
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struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
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ulong smode = (csr_read(CSR_MSTATUS) & MSTATUS_MPP) >>
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MSTATUS_MPP_SHIFT;
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switch (funcid) {
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case SBI_EXT_HSM_HART_START:
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ret = sbi_hsm_hart_start(scratch, sbi_domain_thishart_ptr(),
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regs->a0, regs->a1, smode, regs->a2);
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break;
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case SBI_EXT_HSM_HART_STOP:
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ret = sbi_hsm_hart_stop(scratch, TRUE);
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break;
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case SBI_EXT_HSM_HART_GET_STATUS:
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ret = sbi_hsm_hart_get_state(sbi_domain_thishart_ptr(),
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regs->a0);
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break;
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case SBI_EXT_HSM_HART_SUSPEND:
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ret = sbi_hsm_hart_suspend(scratch, regs->a0, regs->a1,
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smode, regs->a2);
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break;
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default:
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ret = SBI_ENOTSUPP;
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};
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if (ret >= 0) {
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*out_val = ret;
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ret = 0;
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}
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return ret;
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}
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struct sbi_ecall_extension ecall_hsm = {
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.extid_start = SBI_EXT_HSM,
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.extid_end = SBI_EXT_HSM,
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.handle = sbi_ecall_hsm_handler,
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};
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