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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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1
include/sbi/sbi_ecall_interface.h
View file

@ -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 {

8
lib/sbi/sbi_ecall_pmu.c
View file

@ -54,6 +54,14 @@ static int sbi_ecall_pmu_handler(unsigned long extid, unsigned long funcid,
ret = sbi_pmu_ctr_fw_read(regs->a0, &temp);
*out_val = temp;
break;
case SBI_EXT_PMU_COUNTER_FW_READ_HI:
#if __riscv_xlen == 32
ret = sbi_pmu_ctr_fw_read(regs->a0, &temp);
*out_val = temp >> 32;
#else
*out_val = 0;
#endif
break;
case SBI_EXT_PMU_COUNTER_START:
#if __riscv_xlen == 32