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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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9
lib/sbi/sbi_ecall_hsm.c
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@@ -22,14 +22,13 @@ static int sbi_ecall_hsm_handler(unsigned long extid, unsigned long funcid,
unsigned long *out_val,
struct sbi_trap_info *out_trap)
{
ulong smode;
int ret = 0;
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
ulong smode = (csr_read(CSR_MSTATUS) & MSTATUS_MPP) >>
MSTATUS_MPP_SHIFT;
switch (funcid) {
case SBI_EXT_HSM_HART_START:
smode = csr_read(CSR_MSTATUS);
smode = (smode & MSTATUS_MPP) >> MSTATUS_MPP_SHIFT;
ret = sbi_hsm_hart_start(scratch, sbi_domain_thishart_ptr(),
regs->a0, regs->a1, smode, regs->a2);
break;
@@ -40,6 +39,10 @@ static int sbi_ecall_hsm_handler(unsigned long extid, unsigned long funcid,
ret = sbi_hsm_hart_get_state(sbi_domain_thishart_ptr(),
regs->a0);
break;
case SBI_EXT_HSM_HART_SUSPEND:
ret = sbi_hsm_hart_suspend(scratch, regs->a0, regs->a1,
smode, regs->a2);
break;
default:
ret = SBI_ENOTSUPP;
};