mirror of
https://github.com/riscv-software-src/opensbi
synced 2025-11-03 21:48:45 +00:00
1e9f88889f
For platforms not having TIME CSR, we trap-n-emulate TIME CSR read/write in OpenSBI. Same rationale applies to HTIMEDELTA CSR as well so we trap-n-emulate HTIMEDELTA CSR for platforms not having TIME CSR. Signed-off-by: Anup Patel <anup.patel@wdc.com>
116 lines
2.5 KiB
C
116 lines
2.5 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#include <sbi/riscv_asm.h>
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#include <sbi/riscv_encoding.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_platform.h>
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#include <sbi/sbi_timer.h>
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static unsigned long time_delta_off;
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#if __riscv_xlen == 32
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u64 get_ticks(void)
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{
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u32 lo, hi, tmp;
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__asm__ __volatile__("1:\n"
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"rdtimeh %0\n"
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"rdtime %1\n"
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"rdtimeh %2\n"
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"bne %0, %2, 1b"
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: "=&r"(hi), "=&r"(lo), "=&r"(tmp));
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return ((u64)hi << 32) | lo;
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}
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#else
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u64 get_ticks(void)
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{
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unsigned long n;
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__asm__ __volatile__("rdtime %0" : "=r"(n));
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return n;
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}
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#endif
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u64 sbi_timer_value(struct sbi_scratch *scratch)
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{
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const struct sbi_platform *plat = sbi_platform_ptr(scratch);
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if (sbi_platform_has_timer_value(plat))
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return sbi_platform_timer_value(plat);
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else
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return get_ticks();
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}
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u64 sbi_timer_virt_value(struct sbi_scratch *scratch)
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{
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u64 *time_delta = sbi_scratch_offset_ptr(scratch, time_delta_off);
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return sbi_timer_value(scratch) + *time_delta;
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}
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u64 sbi_timer_get_delta(struct sbi_scratch *scratch)
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{
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u64 *time_delta = sbi_scratch_offset_ptr(scratch, time_delta_off);
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return *time_delta;
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}
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void sbi_timer_set_delta(struct sbi_scratch *scratch, ulong delta)
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{
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u64 *time_delta = sbi_scratch_offset_ptr(scratch, time_delta_off);
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*time_delta = (u64)delta;
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}
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void sbi_timer_set_delta_upper(struct sbi_scratch *scratch, ulong delta_upper)
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{
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u64 *time_delta = sbi_scratch_offset_ptr(scratch, time_delta_off);
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*time_delta &= 0xffffffffULL;
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*time_delta |= ((u64)delta_upper << 32);
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}
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void sbi_timer_event_stop(struct sbi_scratch *scratch)
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{
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sbi_platform_timer_event_stop(sbi_platform_ptr(scratch));
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}
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void sbi_timer_event_start(struct sbi_scratch *scratch, u64 next_event)
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{
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sbi_platform_timer_event_start(sbi_platform_ptr(scratch), next_event);
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csr_clear(CSR_MIP, MIP_STIP);
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csr_set(CSR_MIE, MIP_MTIP);
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}
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void sbi_timer_process(struct sbi_scratch *scratch)
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{
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csr_clear(CSR_MIE, MIP_MTIP);
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csr_set(CSR_MIP, MIP_STIP);
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}
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int sbi_timer_init(struct sbi_scratch *scratch, bool cold_boot)
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{
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u64 *time_delta;
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if (cold_boot) {
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time_delta_off = sbi_scratch_alloc_offset(sizeof(*time_delta),
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"TIME_DELTA");
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if (!time_delta_off)
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return SBI_ENOMEM;
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} else {
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if (!time_delta_off)
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return SBI_ENOMEM;
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}
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time_delta = sbi_scratch_offset_ptr(scratch, time_delta_off);
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*time_delta = 0;
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return sbi_platform_timer_init(sbi_platform_ptr(scratch), cold_boot);
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}
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