GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/arch/riscv/lib/interrupts.c

@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2016-17 Microsemi Corporation.
+ * Padmarao Begari, Microsemi Corporation <padmarao.begari@microsemi.com>
+ *
+ * Copyright (C) 2017 Andes Technology Corporation
+ * Rick Chen, Andes Technology Corporation <rick@andestech.com>
+ */
+
+#include <common.h>
+#include <irq_func.h>
+#include <asm/ptrace.h>
+#include <asm/system.h>
+#include <asm/encoding.h>
+
+static void _exit_trap(ulong code, ulong epc, struct pt_regs *regs)
+{
+	static const char * const exception_code[] = {
+		"Instruction address misaligned",
+		"Instruction access fault",
+		"Illegal instruction",
+		"Breakpoint",
+		"Load address misaligned",
+		"Load access fault",
+		"Store/AMO address misaligned",
+		"Store/AMO access fault",
+		"Environment call from U-mode",
+		"Environment call from S-mode",
+		"Reserved",
+		"Environment call from M-mode",
+		"Instruction page fault",
+		"Load page fault",
+		"Reserved",
+		"Store/AMO page fault",
+	};
+
+	if (code < ARRAY_SIZE(exception_code)) {
+		printf("exception code: %ld , %s , epc %lx , ra %lx\n",
+		       code, exception_code[code], epc, regs->ra);
+	} else {
+		printf("reserved exception code: %ld , epc %lx , ra %lx\n",
+		       code, epc, regs->ra);
+	}
+
+	hang();
+}
+
+int interrupt_init(void)
+{
+	return 0;
+}
+
+/*
+ * enable interrupts
+ */
+void enable_interrupts(void)
+{
+}
+
+/*
+ * disable interrupts
+ */
+int disable_interrupts(void)
+{
+	return 0;
+}
+
+ulong handle_trap(ulong cause, ulong epc, struct pt_regs *regs)
+{
+	ulong is_irq, irq;
+
+	is_irq = (cause & MCAUSE_INT);
+	irq = (cause & ~MCAUSE_INT);
+
+	if (is_irq) {
+		switch (irq) {
+		case IRQ_M_EXT:
+		case IRQ_S_EXT:
+			external_interrupt(0);	/* handle external interrupt */
+			break;
+		case IRQ_M_TIMER:
+		case IRQ_S_TIMER:
+			timer_interrupt(0);	/* handle timer interrupt */
+			break;
+		default:
+			_exit_trap(cause, epc, regs);
+			break;
+		};
+	} else {
+		_exit_trap(cause, epc, regs);
+	}
+
+	return epc;
+}
+
+/*
+ *Entry Point for PLIC Interrupt Handler
+ */
+__attribute__((weak)) void external_interrupt(struct pt_regs *regs)
+{
+}
+
+__attribute__((weak)) void timer_interrupt(struct pt_regs *regs)
+{
+}