avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/arch/sparc/cpu/leon3/interrupts.c

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+/*
+ * (C) Copyright 2007
+ * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
+ *
+ * (C) Copyright 2006
+ * Detlev Zundel, DENX Software Engineering, dzu@denx.de
+ *
+ * (C) Copyright -2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2001
+ * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <asm/stack.h>
+#include <common.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <command.h>
+#include <asm/irq.h>
+
+#include <asm/leon.h>
+#include <ambapp.h>
+#include <grlib/irqmp.h>
+#include <grlib/gptimer.h>
+
+/* 15 normal irqs and a non maskable interrupt */
+#define NR_IRQS 15
+
+struct irq_action {
+	interrupt_handler_t *handler;
+	void *arg;
+	unsigned int count;
+};
+
+extern ambapp_dev_irqmp *irqmp;
+extern ambapp_dev_gptimer *gptimer;
+
+static struct irq_action irq_handlers[NR_IRQS] = { {0}, };
+static int spurious_irq_cnt = 0;
+static int spurious_irq = 0;
+
+static inline unsigned int irqmp_get_irqmask(unsigned int irq)
+{
+	if ((irq < 0) || (irq >= NR_IRQS)) {
+		return 0;
+	} else {
+		return (1 << irq);
+	}
+
+}
+
+static void leon3_ic_disable(unsigned int irq)
+{
+	unsigned int mask, pil;
+	if (!irqmp)
+		return;
+
+	pil = intLock();
+
+	/* get mask of interrupt */
+	mask = irqmp_get_irqmask(irq);
+
+	/* set int level */
+	irqmp->cpu_mask[0] = SPARC_NOCACHE_READ(&irqmp->cpu_mask[0]) & (~mask);
+
+	intUnlock(pil);
+}
+
+static void leon3_ic_enable(unsigned int irq)
+{
+	unsigned int mask, pil;
+	if (!irqmp)
+		return;
+
+	pil = intLock();
+
+	/* get mask of interrupt */
+	mask = irqmp_get_irqmask(irq);
+
+	/* set int level */
+	irqmp->cpu_mask[0] = SPARC_NOCACHE_READ(&irqmp->cpu_mask[0]) | mask;
+
+	intUnlock(pil);
+
+}
+
+void handler_irq(int irq, struct pt_regs *regs)
+{
+	if (irq_handlers[irq].handler) {
+		if (((unsigned int)irq_handlers[irq].handler > CONFIG_SYS_RAM_END) ||
+		    ((unsigned int)irq_handlers[irq].handler < CONFIG_SYS_RAM_BASE)
+		    ) {
+			printf("handler_irq: bad handler: %x, irq number %d\n",
+			       (unsigned int)irq_handlers[irq].handler, irq);
+			return;
+		}
+		irq_handlers[irq].handler(irq_handlers[irq].arg);
+		irq_handlers[irq].count++;
+	} else {
+		spurious_irq_cnt++;
+		spurious_irq = irq;
+	}
+}
+
+void leon3_force_int(int irq)
+{
+	if (!irqmp || (irq >= NR_IRQS) || (irq < 0))
+		return;
+	printf("Forcing interrupt %d\n", irq);
+
+	irqmp->iforce = SPARC_NOCACHE_READ(&irqmp->iforce) | (1 << irq);
+}
+
+/****************************************************************************/
+
+int interrupt_init_cpu(void)
+{
+
+	return (0);
+}
+
+/****************************************************************************/
+
+/*
+ * Install and free a interrupt handler.
+ */
+
+void irq_install_handler(int irq, interrupt_handler_t * handler, void *arg)
+{
+	if (irq < 0 || irq >= NR_IRQS) {
+		printf("irq_install_handler: bad irq number %d\n", irq);
+		return;
+	}
+
+	if (irq_handlers[irq].handler != NULL)
+		printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
+		       (ulong) handler, (ulong) irq_handlers[irq].handler);
+
+	if (((unsigned int)handler > CONFIG_SYS_RAM_END) ||
+	    ((unsigned int)handler < CONFIG_SYS_RAM_BASE)
+	    ) {
+		printf("irq_install_handler: bad handler: %x, irq number %d\n",
+		       (unsigned int)handler, irq);
+		return;
+	}
+	irq_handlers[irq].handler = handler;
+	irq_handlers[irq].arg = arg;
+
+	/* enable irq on IRQMP hardware */
+	leon3_ic_enable(irq);
+
+}
+
+void irq_free_handler(int irq)
+{
+	if (irq < 0 || irq >= NR_IRQS) {
+		printf("irq_free_handler: bad irq number %d\n", irq);
+		return;
+	}
+
+	/* disable irq on IRQMP hardware */
+	leon3_ic_disable(irq);
+
+	irq_handlers[irq].handler = NULL;
+	irq_handlers[irq].arg = NULL;
+}
+
+/****************************************************************************/
+
+#if defined(CONFIG_CMD_IRQ)
+void do_irqinfo(cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char * const argv[])
+{
+	int irq;
+	unsigned int pil = get_pil();
+	printf("PIL level: %u\n\r", pil);
+	printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
+	       spurious_irq_cnt, spurious_irq);
+
+	puts("\nInterrupt-Information:\n" "Nr  Routine   Arg       Count\n");
+
+	for (irq = 0; irq < NR_IRQS; irq++) {
+		if (irq_handlers[irq].handler != NULL) {
+			printf("%02d  %p  %p  %d\n", irq,
+			       irq_handlers[irq].handler,
+			       irq_handlers[irq].arg,
+			       irq_handlers[irq].count);
+		}
+	}
+}
+#endif