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lib: sbi: Implement SBI HSM suspend function

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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>
This commit is contained in:
Anup Patel
2021-02-06 14:48:56 +05:30
committed by Anup Patel
parent 807d71c4ff
commit 74756891cc
4 changed files with 235 additions and 9 deletions
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4
include/sbi/sbi_hsm.h
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@@ -22,6 +22,10 @@ int sbi_hsm_hart_start(struct sbi_scratch *scratch,
const struct sbi_domain *dom,
u32 hartid, ulong saddr, ulong smode, ulong priv);
int sbi_hsm_hart_stop(struct sbi_scratch *scratch, bool exitnow);
void sbi_hsm_hart_resume_start(struct sbi_scratch *scratch);
void sbi_hsm_hart_resume_finish(struct sbi_scratch *scratch);
int sbi_hsm_hart_suspend(struct sbi_scratch *scratch, u32 suspend_type,
ulong raddr, ulong rmode, ulong priv);
int sbi_hsm_hart_get_state(const struct sbi_domain *dom, u32 hartid);
int sbi_hsm_hart_interruptible_mask(const struct sbi_domain *dom,
ulong hbase, ulong *out_hmask);