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lib: sbi: Allow specifying start mode to sbi_hsm_hart_start() API

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The sbi_scratch already has provision to specify the next stage mode
so we can leverage this to specify start mode to sbi_hsm_hart_start().

In future, this will be useful in providing SBI calls to U-mode on
embedded cores where we M-mode and U-mode but no S-mode.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-09-07 11:11:29 +05:30
committed by Anup Patel
parent c1c7c3ee9e
commit 6734304f8c
3 changed files with 11 additions and 3 deletions
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6
lib/sbi/sbi_ecall_hsm.c
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@@ -19,12 +19,16 @@ static int sbi_ecall_hsm_handler(unsigned long extid, unsigned long funcid,
unsigned long *args, unsigned long *out_val,
struct sbi_trap_info *out_trap)
{
ulong smode;
int ret = 0, hstate;
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
switch (funcid) {
case SBI_EXT_HSM_HART_START:
ret = sbi_hsm_hart_start(scratch, args[0], args[1], args[2]);
smode = csr_read(CSR_MSTATUS);
smode = (smode & MSTATUS_MPP) >> MSTATUS_MPP_SHIFT;
ret = sbi_hsm_hart_start(scratch, args[0], args[1],
smode, args[2]);
break;
case SBI_EXT_HSM_HART_STOP:
ret = sbi_hsm_hart_stop(scratch, TRUE);