[RFC PATCH 08/12] lib: sbi_init: print M-mode World ID at boot

[Yu-Chien Peter Lin]

This extends sbi_boot_print_hart() to display M-mode World ID
configuration during initialization. Shows mwid value from CSR_MWID
and lock status for Smwid extension, pmwid value from DT when
available, or "unsupported" message. Provides visibility into Worlds
configuration at boot for verification.

Signed-off-by: Yu-Chien Peter Lin <peter.lin at sifive.com>
---
 lib/sbi/sbi_init.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/lib/sbi/sbi_init.c b/lib/sbi/sbi_init.c
index 658fe37f..1fb79eae 100644
--- a/lib/sbi/sbi_init.c
+++ b/lib/sbi/sbi_init.c
@@ -169,6 +169,7 @@ static void sbi_boot_print_hart(struct sbi_scratch *scratch, u32 hartid)
 	int xlen;
 	char str[256];
 	const struct sbi_domain *dom = sbi_domain_thishart_ptr();
+	struct sbi_hart_features *hf = sbi_hart_features_ptr(scratch);
 
 	if (scratch->options & SBI_SCRATCH_NO_BOOT_PRINTS)
 		return;
@@ -201,6 +202,18 @@ static void sbi_boot_print_hart(struct sbi_scratch *scratch, u32 hartid)
 	sbi_printf("Boot HART Debug Triggers    : %d triggers\n",
 		   sbi_dbtr_get_total_triggers());
 	sbi_hart_delegation_dump(scratch, "Boot HART ", "           ");
+	if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SMWID)) {
+		ulong mwid = csr_read(CSR_MWID);
+
+		sbi_printf("Boot HART M-mode World ID   : %lu (%s)\n",
+			   mwid & ~MWID_LOCK,
+			   (mwid & MWID_LOCK) ? "locked" : "unlocked");
+	} else if (hf->has_pmwid) {
+		sbi_printf("Boot HART M-mode World ID   : %u (pmwid)\n",
+			   hf->pmwid);
+	} else {
+		sbi_printf("Boot HART M-mode World ID   : unsupported\n");
+	}
 }
 
 static unsigned long coldboot_done;
-- 
2.43.7