lib: sbi: Add Zicntr as a HART ISA extension

Recently ratified Zicntr ISA extension covers cycle, time and
instret CSRs so we replace the "time" ISA extension with "zicntr"
ISA extension in OpenSBI.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Xiang W <wxjstz@126.com>

include/sbi/sbi_hart.h

@@ -28,8 +28,8 @@ enum sbi_hart_priv_versions {
 enum sbi_hart_extensions {
 	/** Hart has Sscofpmt extension */
 	SBI_HART_EXT_SSCOFPMF = 0,
-	/** HART has HW time CSR (extension name not available) */
-	SBI_HART_EXT_TIME,
+	/** HART has Zicntr extension (i.e. HW cycle, time & instret CSRs) */
+	SBI_HART_EXT_ZICNTR,
 	/** HART has AIA M-mode CSRs */
 	SBI_HART_EXT_SMAIA,
 	/** HART has Smstateen CSR **/

lib/sbi/sbi_hart.c

@@ -441,8 +441,8 @@ static inline char *sbi_hart_extension_id2string(int ext)
 	case SBI_HART_EXT_SSCOFPMF:
 		estr = "sscofpmf";
 		break;
-	case SBI_HART_EXT_TIME:
-		estr = "time";
+	case SBI_HART_EXT_ZICNTR:
+		estr = "zicntr";
 		break;
 	case SBI_HART_EXT_SMAIA:
 		estr = "smaia";
@@ -676,7 +676,7 @@ __mhpm_skip:
 	csr_read_allowed(CSR_TIME, (unsigned long)&trap);
 	if (!trap.cause)
 		__sbi_hart_update_extension(hfeatures,
-					SBI_HART_EXT_TIME, true);
+					SBI_HART_EXT_ZICNTR, true);
 
 	/* Detect if hart has AIA local interrupt CSRs */
 	csr_read_allowed(CSR_MTOPI, (unsigned long)&trap);

lib/sbi/sbi_timer.c

@@ -188,7 +188,7 @@ int sbi_timer_init(struct sbi_scratch *scratch, bool cold_boot)
 		if (!time_delta_off)
 			return SBI_ENOMEM;
 
-		if (sbi_hart_has_extension(scratch, SBI_HART_EXT_TIME))
+		if (sbi_hart_has_extension(scratch, SBI_HART_EXT_ZICNTR))
 			get_time_val = get_ticks;
 	} else {
 		if (!time_delta_off)