upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
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385 lines
6.4 KiB
385 lines
6.4 KiB
/*
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* U-boot - entry.h Routines for context saving and restoring
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*
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* Copyright (c) 2005 blackfin.uclinux.org
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __BLACKFIN_ENTRY_H
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#define __BLACKFIN_ENTRY_H
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#include <linux/config.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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/*
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* Stack layout in 'ret_from_exception':
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*
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*/
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/*
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* Register %p2 is now set to the current task throughout
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* the whole kernel.
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*/
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#ifdef __ASSEMBLY__
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#define LFLUSH_I_AND_D 0x00000808
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#define LSIGTRAP 5
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/* process bits for task_struct.flags */
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#define PF_TRACESYS_OFF 3
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#define PF_TRACESYS_BIT 5
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#define PF_PTRACED_OFF 3
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#define PF_PTRACED_BIT 4
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#define PF_DTRACE_OFF 1
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#define PF_DTRACE_BIT 5
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#define NEW_PT_REGS
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#if defined(NEW_PT_REGS)
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#define SAVE_ALL_INT save_context_no_interrupts
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#define SAVE_ALL_SYS save_context_no_interrupts
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#define SAVE_CONTEXT save_context_with_interrupts
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#define RESTORE_ALL restore_context_no_interrupts
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#define RESTORE_ALL_SYS restore_context_no_interrupts
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#define RESTORE_CONTEXT restore_context_with_interrupts
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#else
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#define SAVE_ALL_INT save_all_int
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#define SAVE_ALL_SYS save_all_sys
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#define SAVE_CONTEXT save_context
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#define RESTORE_ALL restore_context
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#define RESTORE_CONTEXT restore_context
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#endif
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/*
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* Code to save processor context.
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* We even save the register which are preserved by a function call
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* - r4, r5, r6, r7, p3, p4, p5
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*/
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.macro save_context_with_interrupts
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[--sp] = R0;
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[--sp] = ( R7:0, P5:0 );
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[--sp] = fp;
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[--sp] = usp;
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[--sp] = i0;
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[--sp] = i1;
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[--sp] = i2;
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[--sp] = i3;
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[--sp] = m0;
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[--sp] = m1;
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[--sp] = m2;
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[--sp] = m3;
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[--sp] = l0;
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[--sp] = l1;
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[--sp] = l2;
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[--sp] = l3;
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[--sp] = b0;
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[--sp] = b1;
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[--sp] = b2;
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[--sp] = b3;
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[--sp] = a0.x;
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[--sp] = a0.w;
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[--sp] = a1.x;
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[--sp] = a1.w;
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[--sp] = LC0;
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[--sp] = LC1;
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[--sp] = LT0;
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[--sp] = LT1;
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[--sp] = LB0;
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[--sp] = LB1;
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[--sp] = ASTAT;
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[--sp] = r0; /* Skip reserved */
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[--sp] = RETS;
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[--sp] = RETI;
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[--sp] = RETX;
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[--sp] = RETN;
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[--sp] = RETE;
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[--sp] = SEQSTAT;
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[--sp] = SYSCFG;
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[--sp] = r0; /* Skip IPEND as well. */
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.endm
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.macro save_context_no_interrupts
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[--sp] = R0;
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[--sp] = ( R7:0, P5:0 );
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[--sp] = fp;
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[--sp] = usp;
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[--sp] = i0;
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[--sp] = i1;
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[--sp] = i2;
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[--sp] = i3;
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[--sp] = m0;
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[--sp] = m1;
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[--sp] = m2;
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[--sp] = m3;
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[--sp] = l0;
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[--sp] = l1;
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[--sp] = l2;
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[--sp] = l3;
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[--sp] = b0;
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[--sp] = b1;
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[--sp] = b2;
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[--sp] = b3;
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[--sp] = a0.x;
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[--sp] = a0.w;
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[--sp] = a1.x;
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[--sp] = a1.w;
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[--sp] = LC0;
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[--sp] = LC1;
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[--sp] = LT0;
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[--sp] = LT1;
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[--sp] = LB0;
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[--sp] = LB1;
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[--sp] = ASTAT;
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[--sp] = r0; /* Skip reserved */
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[--sp] = RETS;
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r0 = RETI;
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[--sp] = r0;
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[--sp] = RETX;
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[--sp] = RETN;
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[--sp] = RETE;
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[--sp] = SEQSTAT;
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[--sp] = SYSCFG;
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[--sp] = r0; /* Skip IPEND as well. */
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.endm
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.macro restore_context_no_interrupts
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sp += 4;
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SYSCFG = [sp++];
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SEQSTAT = [sp++];
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RETE = [sp++];
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RETN = [sp++];
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RETX = [sp++];
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r0 = [sp++];
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RETI = r0;
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RETS = [sp++];
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sp += 4;
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ASTAT = [sp++];
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LB1 = [sp++];
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LB0 = [sp++];
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LT1 = [sp++];
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LT0 = [sp++];
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LC1 = [sp++];
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LC0 = [sp++];
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a1.w = [sp++];
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a1.x = [sp++];
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a0.w = [sp++];
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a0.x = [sp++];
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b3 = [sp++];
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b2 = [sp++];
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b1 = [sp++];
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b0 = [sp++];
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l3 = [sp++];
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l2 = [sp++];
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l1 = [sp++];
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l0 = [sp++];
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m3 = [sp++];
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m2 = [sp++];
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m1 = [sp++];
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m0 = [sp++];
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i3 = [sp++];
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i2 = [sp++];
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i1 = [sp++];
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i0 = [sp++];
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sp += 4;
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fp = [sp++];
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( R7 : 0, P5 : 0) = [ SP ++ ];
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sp += 4;
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.endm
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.macro restore_context_with_interrupts
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sp += 4;
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SYSCFG = [sp++];
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SEQSTAT = [sp++];
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RETE = [sp++];
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RETN = [sp++];
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RETX = [sp++];
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RETI = [sp++];
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RETS = [sp++];
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sp += 4;
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ASTAT = [sp++];
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LB1 = [sp++];
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LB0 = [sp++];
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LT1 = [sp++];
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LT0 = [sp++];
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LC1 = [sp++];
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LC0 = [sp++];
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a1.w = [sp++];
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a1.x = [sp++];
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a0.w = [sp++];
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a0.x = [sp++];
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b3 = [sp++];
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b2 = [sp++];
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b1 = [sp++];
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b0 = [sp++];
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l3 = [sp++];
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l2 = [sp++];
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l1 = [sp++];
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l0 = [sp++];
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m3 = [sp++];
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m2 = [sp++];
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m1 = [sp++];
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m0 = [sp++];
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i3 = [sp++];
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i2 = [sp++];
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i1 = [sp++];
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i0 = [sp++];
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sp += 4;
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fp = [sp++];
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( R7 : 0, P5 : 0) = [ SP ++ ];
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sp += 4;
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.endm
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#if !defined(NEW_PT_REGS)
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/*
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* a -1 in the orig_r0 field signifies
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* that the stack frame is NOT for syscall
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*/
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.macro save_all_int
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/* reserved and disable the single step of SYSCFG, by Steven Chen 03/07/10 */
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[--sp] = r0;
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r0.l = 0x30; /* Errata for BF533 */
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r0.h = 0x0;
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syscfg = r0; /* disable single step flag in SYSCFG */
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r0 = [sp++];
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[--sp] = syscfg; /* store SYSCFG */
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[--sp] = r0; /* Reserved for IPEND */
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[--sp] = fp;
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[--sp] = usp;
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[--sp] = r0;
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[--sp] = r0;
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r0 = [sp + 8];
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[--sp] = a0.x;
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[--sp] = a1.x;
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[--sp] = a0.w;
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[--sp] = a1.w;
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[--sp] = rets;
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[--sp] = astat;
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[--sp] = seqstat;
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[--sp] = retx; /* current pc when exception happens */
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[--sp] = ( r7:5, p5:0 );
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[--sp] = r1;
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[--sp] = r2;
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[--sp] = r4;
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[--sp] = r3;
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.endm
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.macro save_all_sys
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[--sp] = r0;
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[--sp] = r0;
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[--sp] = a0.x;
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[--sp] = a1.x;
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[--sp] = a0.w;
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[--sp] = a1.w;
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[--sp] = rets;
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[--sp] = astat;
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[--sp] = seqstat;
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[--sp] = retx; /* current pc when exception happens */
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[--sp] = ( r7:5, p5:0 );
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[--sp] = r1;
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[--sp] = r2;
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[--sp] = r4;
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[--sp] = r3;
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.endm
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.macro restore_all
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r3 = [sp++];
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r4 = [sp++];
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r2 = [sp++];
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r1 = [sp++];
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( r7:5, p5:0 ) = [sp++];
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retx = [sp++];
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seqstat = [sp++];
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astat = [sp++];
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rets = [sp++];
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a1.w = [sp++];
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a0.w = [sp++];
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a1.x = [sp++];
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a0.x = [sp++];
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sp += 4; /* orig r0 */
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r0 = [sp++];
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sp += 4;
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fp = [sp++];
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sp +=4; /* Skip the IPEND */
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syscfg = [sp++];
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.endm
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#endif
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#define STR(X) STR1(X)
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#define STR1(X) #X
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#if defined(NEW_PT_REGS)
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#define PT_OFF_ORIG_R0 208
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#define PT_OFF_SR 8
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#else
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#define PT_OFF_ORIG_R0 0x54
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#define PT_OFF_SR 0x38 /* seqstat in pt_regs */
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#endif
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#endif
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#endif
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