From 9e8ff05cb61f157fb0bcb6b0071d7b6dc0763faa Mon Sep 17 00:00:00 2001
From: Anup Patel <anup.patel@wdc.com>
Date: Tue, 11 Dec 2018 19:24:06 +0530
Subject: Initial commit.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
---
 lib/sbi_emulate_csr.c | 157 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 lib/sbi_emulate_csr.c

(limited to 'lib/sbi_emulate_csr.c')

diff --git a/lib/sbi_emulate_csr.c b/lib/sbi_emulate_csr.c
new file mode 100644
index 0000000..cc74f96
--- /dev/null
+++ b/lib/sbi_emulate_csr.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) 2018 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <sbi/riscv_asm.h>
+#include <sbi/riscv_encoding.h>
+#include <sbi/sbi_bits.h>
+#include <sbi/sbi_console.h>
+#include <sbi/sbi_emulate_csr.h>
+#include <sbi/sbi_error.h>
+#include <sbi/sbi_timer.h>
+
+int sbi_emulate_csr_read(int csr_num,
+			 u32 hartid, ulong mstatus,
+			 struct sbi_scratch *scratch,
+			 ulong *csr_val)
+{
+	ulong cen = -1UL;
+
+	if (EXTRACT_FIELD(mstatus, MSTATUS_MPP) == PRV_U)
+		cen = csr_read(scounteren);
+
+	switch (csr_num) {
+	case CSR_MISA:
+		*csr_val = csr_read(misa);
+		break;
+	case CSR_MVENDORID:
+		*csr_val = csr_read(mvendorid);
+		break;
+	case CSR_MARCHID:
+		*csr_val = csr_read(marchid);
+		break;
+	case CSR_MIMPID:
+		*csr_val = csr_read(mimpid);
+		break;
+	case CSR_MHARTID:
+		*csr_val = csr_read(mhartid);
+		break;
+	case CSR_CYCLE:
+		if (!((cen >> (CSR_CYCLE - CSR_CYCLE)) & 1))
+			return -1;
+		*csr_val = csr_read(mcycle);
+		break;
+	case CSR_TIME:
+		if (!((cen >> (CSR_TIME - CSR_CYCLE)) & 1))
+			return -1;
+		*csr_val = sbi_timer_value(scratch);
+		break;
+	case CSR_INSTRET:
+		if (!((cen >> (CSR_INSTRET - CSR_CYCLE)) & 1))
+			return -1;
+		*csr_val = csr_read(minstret);
+		break;
+	case CSR_MHPMCOUNTER3:
+		if (!((cen >> (3 + CSR_MHPMCOUNTER3 - CSR_MHPMCOUNTER3)) & 1))
+			return -1;
+		*csr_val = csr_read(mhpmcounter3);
+		break;
+	case CSR_MHPMCOUNTER4:
+		if (!((cen >> (3 + CSR_MHPMCOUNTER4 - CSR_MHPMCOUNTER3)) & 1))
+			return -1;
+		*csr_val = csr_read(mhpmcounter4);
+		break;
+#if __riscv_xlen == 32
+	case CSR_CYCLEH:
+		if (!((cen >> (CSR_CYCLE - CSR_CYCLE)) & 1))
+			return -1;
+		*csr_val = csr_read(mcycleh);
+		break;
+	case CSR_TIMEH:
+		if (!((cen >> (CSR_TIME - CSR_CYCLE)) & 1))
+			return -1;
+		*csr_val = sbi_timer_value(scratch);
+		*csr_val = *csr_val >> 32;
+		break;
+	case CSR_INSTRETH:
+		if (!((cen >> (CSR_INSTRET - CSR_CYCLE)) & 1))
+			return -1;
+		*csr_val = csr_read(minstreth);
+		break;
+	case CSR_MHPMCOUNTER3H:
+		if (!((cen >> (3 + CSR_MHPMCOUNTER3 - CSR_MHPMCOUNTER3)) & 1))
+			return -1;
+		*csr_val = csr_read(mhpmcounter3h);
+		break;
+	case CSR_MHPMCOUNTER4H:
+		if (!((cen >> (3 + CSR_MHPMCOUNTER4 - CSR_MHPMCOUNTER3)) & 1))
+			return -1;
+		*csr_val = csr_read(mhpmcounter4h);
+		break;
+#endif
+	case CSR_MHPMEVENT3:
+		*csr_val = csr_read(mhpmevent3);
+		break;
+	case CSR_MHPMEVENT4:
+		*csr_val = csr_read(mhpmevent4);
+		break;
+	default:
+		sbi_printf("%s: hartid%d: invalid csr_num=0x%x\n",
+			   __func__, hartid, csr_num);
+		return SBI_ENOTSUPP;
+	};
+
+	return 0;
+}
+
+int sbi_emulate_csr_write(int csr_num,
+			  u32 hartid, ulong mstatus,
+			  struct sbi_scratch *scratch,
+			  ulong csr_val)
+{
+	switch (csr_num) {
+	case CSR_CYCLE:
+		csr_write(mcycle, csr_val);
+		break;
+	case CSR_INSTRET:
+		csr_write(minstret, csr_val);
+		break;
+	case CSR_MHPMCOUNTER3:
+		csr_write(mhpmcounter3, csr_val);
+		break;
+	case CSR_MHPMCOUNTER4:
+		csr_write(mhpmcounter4, csr_val);
+		break;
+#if __riscv_xlen == 32
+	case CSR_CYCLEH:
+		csr_write(mcycleh, csr_val);
+		break;
+	case CSR_INSTRETH:
+		csr_write(minstreth, csr_val);
+		break;
+	case CSR_MHPMCOUNTER3H:
+		csr_write(mhpmcounter3h, csr_val);
+		break;
+	case CSR_MHPMCOUNTER4H:
+		csr_write(mhpmcounter4h, csr_val);
+		break;
+#endif
+	case CSR_MHPMEVENT3:
+		csr_write(mhpmevent3, csr_val);
+		break;
+	case CSR_MHPMEVENT4:
+		csr_write(mhpmevent4, csr_val);
+		break;
+	default:
+		sbi_printf("%s: hartid%d: invalid csr_num=0x%x\n",
+			   __func__, hartid, csr_num);
+		return SBI_ENOTSUPP;
+	};
+
+	return 0;
+}
-- 
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