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lib: Emulate HTIMEDELTA CSR for platforms not having TIME CSR

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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>
This commit is contained in:
Anup Patel
2019-08-18 13:14:44 +05:30
committed by Anup Patel
parent 7d4420bd69
commit 1e9f88889f
6 changed files with 124 additions and 19 deletions
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4
include/sbi/riscv_encoding.h
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@@ -276,7 +276,9 @@
#define CSR_HSTATUS 0x600
#define CSR_HEDELEG 0x602
#define CSR_HIDELEG 0x603
#define CSR_HCOUNTERNEN 0x606
#define CSR_HTIMEDELTA 0x605
#define CSR_HTIMEDELTAH 0x615
#define CSR_HCOUNTERNEN 0x606
#define CSR_HGATP 0x680
#define CSR_VSSTATUS 0x200

5
include/sbi/sbi_emulate_csr.h
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@@ -12,12 +12,13 @@
#include <sbi/sbi_types.h>
struct sbi_trap_regs;
struct sbi_scratch;
int sbi_emulate_csr_read(int csr_num, u32 hartid, ulong mstatus,
int sbi_emulate_csr_read(int csr_num, u32 hartid, struct sbi_trap_regs *regs,
struct sbi_scratch *scratch, ulong *csr_val);
int sbi_emulate_csr_write(int csr_num, u32 hartid, ulong mstatus,
int sbi_emulate_csr_write(int csr_num, u32 hartid, struct sbi_trap_regs *regs,
struct sbi_scratch *scratch, ulong csr_val);
#endif

8
include/sbi/sbi_timer.h
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@@ -16,6 +16,14 @@ struct sbi_scratch;
u64 sbi_timer_value(struct sbi_scratch *scratch);
u64 sbi_timer_virt_value(struct sbi_scratch *scratch);
u64 sbi_timer_get_delta(struct sbi_scratch *scratch);
void sbi_timer_set_delta(struct sbi_scratch *scratch, ulong delta);
void sbi_timer_set_delta_upper(struct sbi_scratch *scratch, ulong delta_upper);
void sbi_timer_event_stop(struct sbi_scratch *scratch);
void sbi_timer_event_start(struct sbi_scratch *scratch, u64 next_event);