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-rw-r--r--include/asm-blackfin/entry.h385
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diff --git a/include/asm-blackfin/entry.h b/include/asm-blackfin/entry.h
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+/*
+ * 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