1 files changed, 124 insertions, 0 deletions
diff --git a/roms/opensbi/lib/sbi/sbi_ecall_legacy.c b/roms/opensbi/lib/sbi/sbi_ecall_legacy.c
new file mode 100644
index 000000000..1a7fe26e4
--- /dev/null
+++ b/roms/opensbi/lib/sbi/sbi_ecall_legacy.c
@@ -0,0 +1,124 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ *   Atish Patra <atish.patra@wdc.com>
+ */
+
+#include <sbi/riscv_asm.h>
+#include <sbi/sbi_console.h>
+#include <sbi/sbi_domain.h>
+#include <sbi/sbi_ecall.h>
+#include <sbi/sbi_ecall_interface.h>
+#include <sbi/sbi_error.h>
+#include <sbi/sbi_hsm.h>
+#include <sbi/sbi_ipi.h>
+#include <sbi/sbi_platform.h>
+#include <sbi/sbi_system.h>
+#include <sbi/sbi_timer.h>
+#include <sbi/sbi_tlb.h>
+#include <sbi/sbi_trap.h>
+#include <sbi/sbi_unpriv.h>
+#include <sbi/sbi_hart.h>
+
+static int sbi_load_hart_mask_unpriv(ulong *pmask, ulong *hmask,
+				     struct sbi_trap_info *uptrap)
+{
+	ulong mask = 0;
+
+	if (pmask) {
+		mask = sbi_load_ulong(pmask, uptrap);
+		if (uptrap->cause)
+			return SBI_ETRAP;
+	} else {
+		sbi_hsm_hart_started_mask(sbi_domain_thishart_ptr(),
+					  0, &mask);
+	}
+	*hmask = mask;
+
+	return 0;
+}
+
+static int sbi_ecall_legacy_handler(unsigned long extid, unsigned long funcid,
+				    const struct sbi_trap_regs *regs,
+				    unsigned long *out_val,
+				    struct sbi_trap_info *out_trap)
+{
+	int ret = 0;
+	struct sbi_tlb_info tlb_info;
+	u32 source_hart = current_hartid();
+	ulong hmask = 0;
+
+	switch (extid) {
+	case SBI_EXT_0_1_SET_TIMER:
+#if __riscv_xlen == 32
+		sbi_timer_event_start((((u64)regs->a1 << 32) | (u64)regs->a0));
+#else
+		sbi_timer_event_start((u64)regs->a0);
+#endif
+		break;
+	case SBI_EXT_0_1_CONSOLE_PUTCHAR:
+		sbi_putc(regs->a0);
+		break;
+	case SBI_EXT_0_1_CONSOLE_GETCHAR:
+		ret = sbi_getc();
+		break;
+	case SBI_EXT_0_1_CLEAR_IPI:
+		sbi_ipi_clear_smode();
+		break;
+	case SBI_EXT_0_1_SEND_IPI:
+		ret = sbi_load_hart_mask_unpriv((ulong *)regs->a0,
+						&hmask, out_trap);
+		if (ret != SBI_ETRAP)
+			ret = sbi_ipi_send_smode(hmask, 0);
+		break;
+	case SBI_EXT_0_1_REMOTE_FENCE_I:
+		ret = sbi_load_hart_mask_unpriv((ulong *)regs->a0,
+						&hmask, out_trap);
+		if (ret != SBI_ETRAP) {
+			SBI_TLB_INFO_INIT(&tlb_info, 0, 0, 0, 0,
+					  sbi_tlb_local_fence_i,
+					  source_hart);
+			ret = sbi_tlb_request(hmask, 0, &tlb_info);
+		}
+		break;
+	case SBI_EXT_0_1_REMOTE_SFENCE_VMA:
+		ret = sbi_load_hart_mask_unpriv((ulong *)regs->a0,
+						&hmask, out_trap);
+		if (ret != SBI_ETRAP) {
+			SBI_TLB_INFO_INIT(&tlb_info, regs->a1, regs->a2, 0, 0,
+					  sbi_tlb_local_sfence_vma,
+					  source_hart);
+			ret = sbi_tlb_request(hmask, 0, &tlb_info);
+		}
+		break;
+	case SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID:
+		ret = sbi_load_hart_mask_unpriv((ulong *)regs->a0,
+						&hmask, out_trap);
+		if (ret != SBI_ETRAP) {
+			SBI_TLB_INFO_INIT(&tlb_info, regs->a1,
+					  regs->a2, regs->a3, 0,
+					  sbi_tlb_local_sfence_vma_asid,
+					  source_hart);
+			ret = sbi_tlb_request(hmask, 0, &tlb_info);
+		}
+		break;
+	case SBI_EXT_0_1_SHUTDOWN:
+		sbi_system_reset(SBI_SRST_RESET_TYPE_SHUTDOWN,
+				 SBI_SRST_RESET_REASON_NONE);
+		break;
+	default:
+		ret = SBI_ENOTSUPP;
+	};
+
+	return ret;
+}
+
+struct sbi_ecall_extension ecall_legacy = {
+	.extid_start = SBI_EXT_0_1_SET_TIMER,
+	.extid_end = SBI_EXT_0_1_SHUTDOWN,
+	.handle = sbi_ecall_legacy_handler,
+};