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/blackfin/include/asm/entry.h

@@ -0,0 +1,243 @@
+/*
+ * entry.h - routines for context saving and restoring (for interrupts/exceptions)
+ *
+ * Copyright (c) 2005-2007 Analog Devices Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __BLACKFIN_ENTRY_H
+#define __BLACKFIN_ENTRY_H
+#ifdef __ASSEMBLY__
+
+#define SAVE_ALL_INT		save_context_no_interrupts
+#define SAVE_ALL_SYS		save_context_no_interrupts
+#define SAVE_CONTEXT		save_context_with_interrupts
+
+#define RESTORE_ALL		restore_context_no_interrupts
+#define RESTORE_ALL_SYS		restore_context_no_interrupts
+#define RESTORE_CONTEXT		restore_context_with_interrupts
+
+/*
+ * Code to save processor context.
+ * We even save the register which are preserved by a function call
+ * - r4, r5, r6, r7, p3, p4, p5
+ */
+.macro save_context_with_interrupts
+	[--sp] = R0;
+	[--sp] = ( R7:0, P5:0 );
+	[--sp] = fp;
+	[--sp] = usp;
+
+	[--sp] = i0;
+	[--sp] = i1;
+	[--sp] = i2;
+	[--sp] = i3;
+
+	[--sp] = m0;
+	[--sp] = m1;
+	[--sp] = m2;
+	[--sp] = m3;
+
+	[--sp] = l0;
+	[--sp] = l1;
+	[--sp] = l2;
+	[--sp] = l3;
+
+	[--sp] = b0;
+	[--sp] = b1;
+	[--sp] = b2;
+	[--sp] = b3;
+	[--sp] = a0.x;
+	[--sp] = a0.w;
+	[--sp] = a1.x;
+	[--sp] = a1.w;
+
+	[--sp] = LC0;
+	[--sp] = LC1;
+	[--sp] = LT0;
+	[--sp] = LT1;
+	[--sp] = LB0;
+	[--sp] = LB1;
+
+	[--sp] = ASTAT;
+
+	[--sp] = r0;	/* Skip reserved */
+	[--sp] = RETS;
+	[--sp] = RETI;
+	[--sp] = RETX;
+	[--sp] = RETN;
+	[--sp] = RETE;
+	[--sp] = SEQSTAT;
+	[--sp] = SYSCFG;
+#ifdef CONFIG_CMD_KGDB
+	p0.l = lo(IPEND)
+	p0.h = hi(IPEND)
+	r0 = [p0];
+#endif
+	[--sp] = r0;	/* Skip IPEND as well. */
+.endm
+
+.macro save_context_no_interrupts
+	[--sp] = R0;
+	[--sp] = ( R7:0, P5:0 );
+	[--sp] = fp;
+	[--sp] = usp;
+
+	[--sp] = i0;
+	[--sp] = i1;
+	[--sp] = i2;
+	[--sp] = i3;
+
+	[--sp] = m0;
+	[--sp] = m1;
+	[--sp] = m2;
+	[--sp] = m3;
+
+	[--sp] = l0;
+	[--sp] = l1;
+	[--sp] = l2;
+	[--sp] = l3;
+
+	[--sp] = b0;
+	[--sp] = b1;
+	[--sp] = b2;
+	[--sp] = b3;
+	[--sp] = a0.x;
+	[--sp] = a0.w;
+	[--sp] = a1.x;
+	[--sp] = a1.w;
+
+	[--sp] = LC0;
+	[--sp] = LC1;
+	[--sp] = LT0;
+	[--sp] = LT1;
+	[--sp] = LB0;
+	[--sp] = LB1;
+
+	[--sp] = ASTAT;
+
+	[--sp] = r0;	/* Skip reserved */
+	[--sp] = RETS;
+	r0 = RETI;
+	[--sp] = r0;
+	[--sp] = RETX;
+	[--sp] = RETN;
+	[--sp] = RETE;
+	[--sp] = SEQSTAT;
+	[--sp] = SYSCFG;
+#ifdef CONFIG_CMD_KGDB
+	p0.l = lo(IPEND)
+	p0.h = hi(IPEND)
+	r0 = [p0];
+#endif
+	[--sp] = r0;	/* Skip IPEND as well. */
+.endm
+
+.macro restore_context_no_interrupts
+	sp += 4;
+	SYSCFG = [sp++];
+	SEQSTAT = [sp++];
+	RETE = [sp++];
+	RETN = [sp++];
+	RETX = [sp++];
+	r0 = [sp++];
+	RETI = r0;
+	RETS = [sp++];
+
+	sp += 4;
+
+	ASTAT = [sp++];
+
+	LB1 = [sp++];
+	LB0 = [sp++];
+	LT1 = [sp++];
+	LT0 = [sp++];
+	LC1 = [sp++];
+	LC0 = [sp++];
+
+	a1.w = [sp++];
+	a1.x = [sp++];
+	a0.w = [sp++];
+	a0.x = [sp++];
+	b3 = [sp++];
+	b2 = [sp++];
+	b1 = [sp++];
+	b0 = [sp++];
+
+	l3 = [sp++];
+	l2 = [sp++];
+	l1 = [sp++];
+	l0 = [sp++];
+
+	m3 = [sp++];
+	m2 = [sp++];
+	m1 = [sp++];
+	m0 = [sp++];
+
+	i3 = [sp++];
+	i2 = [sp++];
+	i1 = [sp++];
+	i0 = [sp++];
+
+	sp += 4;
+	fp = [sp++];
+
+	( R7 : 0, P5 : 0) = [ SP ++ ];
+	sp += 4;
+.endm
+
+.macro restore_context_with_interrupts
+	sp += 4;
+	SYSCFG = [sp++];
+	SEQSTAT = [sp++];
+	RETE = [sp++];
+	RETN = [sp++];
+	RETX = [sp++];
+	RETI = [sp++];
+	RETS = [sp++];
+
+	sp += 4;
+
+	ASTAT = [sp++];
+
+	LB1 = [sp++];
+	LB0 = [sp++];
+	LT1 = [sp++];
+	LT0 = [sp++];
+	LC1 = [sp++];
+	LC0 = [sp++];
+
+	a1.w = [sp++];
+	a1.x = [sp++];
+	a0.w = [sp++];
+	a0.x = [sp++];
+	b3 = [sp++];
+	b2 = [sp++];
+	b1 = [sp++];
+	b0 = [sp++];
+
+	l3 = [sp++];
+	l2 = [sp++];
+	l1 = [sp++];
+	l0 = [sp++];
+
+	m3 = [sp++];
+	m2 = [sp++];
+	m1 = [sp++];
+	m0 = [sp++];
+
+	i3 = [sp++];
+	i2 = [sp++];
+	i1 = [sp++];
+	i0 = [sp++];
+
+	sp += 4;
+	fp = [sp++];
+
+	( R7 : 0, P5 : 0) = [ SP ++ ];
+	sp += 4;
+.endm
+
+#endif
+#endif