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lib: sbi_pmu: Implement sbi_pmu_counter_fw_read_hi

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To support 64 bit firmware counters on RV32 systems, we implement
sbi_pmu_counter_fw_read_hi() which returns the upper 32 bits of
the firmware counter value. On RV64 (or higher) systems, this
function will always return zero.

Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Mayuresh Chitale
2023-03-09 18:43:52 +05:30
committed by Anup Patel
parent 1fe8dc9955
commit 51951d9e9a
2 changed files with 9 additions and 0 deletions
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include/sbi/sbi_ecall_interface.h
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@@ -101,6 +101,7 @@
#define SBI_EXT_PMU_COUNTER_START 0x3
#define SBI_EXT_PMU_COUNTER_STOP 0x4
#define SBI_EXT_PMU_COUNTER_FW_READ 0x5
#define SBI_EXT_PMU_COUNTER_FW_READ_HI 0x6
/** General pmu event codes specified in SBI PMU extension */
enum sbi_pmu_hw_generic_events_t {