Merge with http://www.denx.de/git/u-boot.git

1 files changed, 385 insertions, 0 deletions

diff --git a/include/asm-blackfin/entry.h b/include/asm-blackfin/entry.h
new file mode 100644
index 0000000..607a5b8
--- /dev/null
+++ b/include/asm-blackfin/entry.h
@@ -0,0 +1,385 @@
+/*
+ * U-boot - entry.h Routines for context saving and restoring
+ *
+ * Copyright (c) 2005 blackfin.uclinux.org
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __BLACKFIN_ENTRY_H
+#define __BLACKFIN_ENTRY_H
+
+#include <linux/config.h>
+#include <asm/setup.h>
+#include <asm/page.h>
+
+/*
+ * Stack layout in 'ret_from_exception':
+ *
+ */
+
+/*
+ * Register %p2 is now set to the current task throughout
+ * the whole kernel.
+ */
+
+#ifdef __ASSEMBLY__
+
+#define	LFLUSH_I_AND_D	0x00000808
+#define	LSIGTRAP	5
+
+/* process bits for task_struct.flags */
+#define	PF_TRACESYS_OFF	3
+#define	PF_TRACESYS_BIT	5
+#define	PF_PTRACED_OFF	3
+#define	PF_PTRACED_BIT	4
+#define	PF_DTRACE_OFF	1
+#define	PF_DTRACE_BIT	5
+
+#define NEW_PT_REGS
+
+#if defined(NEW_PT_REGS)
+
+#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
+
+#else
+
+#define SAVE_ALL_INT		save_all_int
+#define SAVE_ALL_SYS		save_all_sys
+#define SAVE_CONTEXT		save_context
+#define RESTORE_ALL		restore_context
+#define RESTORE_CONTEXT		restore_context
+
+#endif
+
+/*
+ * 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;
+	[--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;
+	[--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
+
+#if !defined(NEW_PT_REGS)
+/*
+ * a -1 in the orig_r0 field signifies
+ * that the stack frame is NOT for syscall
+ */
+.macro	save_all_int
+/* reserved and disable the single step of SYSCFG, by Steven Chen 03/07/10 */
+	[--sp] = r0;
+	r0.l = 0x30;		/* Errata for BF533 */
+	r0.h = 0x0;
+	syscfg = r0;		/* disable single step flag in SYSCFG */
+	r0 = [sp++];
+	[--sp] = syscfg;	/* store SYSCFG */
+
+	[--sp] = r0;	/* Reserved for IPEND */
+	[--sp] = fp;
+	[--sp] = usp;
+	[--sp] = r0;
+
+	[--sp] = r0;
+	r0 = [sp + 8];
+	[--sp] = a0.x;
+	[--sp] = a1.x;
+	[--sp] = a0.w;
+	[--sp] = a1.w;
+	[--sp] = rets;
+	[--sp] = astat;
+	[--sp] = seqstat;
+	[--sp] = retx;	/* current pc when exception happens */
+	[--sp] = ( r7:5, p5:0 );
+	[--sp] = r1;
+	[--sp] = r2;
+	[--sp] = r4;
+	[--sp] = r3;
+.endm
+
+.macro	save_all_sys
+	[--sp] = r0;
+	[--sp] = r0;
+	[--sp] = a0.x;
+	[--sp] = a1.x;
+	[--sp] = a0.w;
+	[--sp] = a1.w;
+	[--sp] = rets;
+	[--sp] = astat;
+	[--sp] = seqstat;
+	[--sp] = retx;	/* current pc when exception happens */
+	[--sp] = ( r7:5, p5:0 );
+	[--sp] = r1;
+	[--sp] = r2;
+	[--sp] = r4;
+	[--sp] = r3;
+.endm
+
+.macro	restore_all
+	r3 = [sp++];
+	r4 = [sp++];
+	r2 = [sp++];
+	r1 = [sp++];
+	( r7:5, p5:0 ) = [sp++];
+	retx = [sp++];
+	seqstat = [sp++];
+	astat = [sp++];
+	rets = [sp++];
+	a1.w = [sp++];
+	a0.w = [sp++];
+	a1.x = [sp++];
+	a0.x = [sp++];
+	sp += 4;	/* orig r0 */
+	r0 = [sp++];
+
+	sp += 4;
+	fp = [sp++];
+	sp +=4;		/* Skip the IPEND */
+
+	syscfg = [sp++];
+
+.endm
+
+#endif
+
+#define STR(X) 			STR1(X)
+#define STR1(X) 		#X
+
+#if defined(NEW_PT_REGS)
+
+#define PT_OFF_ORIG_R0		208
+#define PT_OFF_SR		8
+
+#else
+
+#define PT_OFF_ORIG_R0		0x54
+#define PT_OFF_SR		0x38	/* seqstat in pt_regs */
+
+#endif
+#endif
+
+#endif