From 27d22413e60009603bc4eb515392c2639ff31010 Mon Sep 17 00:00:00 2001 From: Ley Foon Tan Date: Thu, 6 Nov 2014 15:19:37 +0800 Subject: nios2: Kernel booting and initialization This patch adds the kernel booting and the initial setup code. Signed-off-by: Ley Foon Tan --- arch/nios2/include/asm/entry.h | 120 +++++++++++++++++++++++++++++++++++++++++ arch/nios2/include/asm/setup.h | 38 +++++++++++++ 2 files changed, 158 insertions(+) create mode 100644 arch/nios2/include/asm/entry.h create mode 100644 arch/nios2/include/asm/setup.h (limited to 'arch/nios2/include') diff --git a/arch/nios2/include/asm/entry.h b/arch/nios2/include/asm/entry.h new file mode 100644 index 000000000000..cf37f55efbc2 --- /dev/null +++ b/arch/nios2/include/asm/entry.h @@ -0,0 +1,120 @@ +/* + * Copyright (C) 2010 Tobias Klauser + * Copyright (C) 2004 Microtronix Datacom Ltd. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#ifndef _ASM_NIOS2_ENTRY_H +#define _ASM_NIOS2_ENTRY_H + +#ifdef __ASSEMBLY__ + +#include +#include +#include + +/* + * Standard Nios2 interrupt entry and exit macros. + * Must be called with interrupts disabled. + */ +.macro SAVE_ALL + rdctl r24, estatus + andi r24, r24, ESTATUS_EU + beq r24, r0, 1f /* In supervisor mode, already on kernel stack */ + + movia r24, _current_thread /* Switch to current kernel stack */ + ldw r24, 0(r24) /* using the thread_info */ + addi r24, r24, THREAD_SIZE-PT_REGS_SIZE + stw sp, PT_SP(r24) /* Save user stack before changing */ + mov sp, r24 + br 2f + +1 : mov r24, sp + addi sp, sp, -PT_REGS_SIZE /* Backup the kernel stack pointer */ + stw r24, PT_SP(sp) +2 : stw r1, PT_R1(sp) + stw r2, PT_R2(sp) + stw r3, PT_R3(sp) + stw r4, PT_R4(sp) + stw r5, PT_R5(sp) + stw r6, PT_R6(sp) + stw r7, PT_R7(sp) + stw r8, PT_R8(sp) + stw r9, PT_R9(sp) + stw r10, PT_R10(sp) + stw r11, PT_R11(sp) + stw r12, PT_R12(sp) + stw r13, PT_R13(sp) + stw r14, PT_R14(sp) + stw r15, PT_R15(sp) + stw r2, PT_ORIG_R2(sp) + stw r7, PT_ORIG_R7(sp) + + stw ra, PT_RA(sp) + stw fp, PT_FP(sp) + stw gp, PT_GP(sp) + rdctl r24, estatus + stw r24, PT_ESTATUS(sp) + stw ea, PT_EA(sp) +.endm + +.macro RESTORE_ALL + ldw r1, PT_R1(sp) /* Restore registers */ + ldw r2, PT_R2(sp) + ldw r3, PT_R3(sp) + ldw r4, PT_R4(sp) + ldw r5, PT_R5(sp) + ldw r6, PT_R6(sp) + ldw r7, PT_R7(sp) + ldw r8, PT_R8(sp) + ldw r9, PT_R9(sp) + ldw r10, PT_R10(sp) + ldw r11, PT_R11(sp) + ldw r12, PT_R12(sp) + ldw r13, PT_R13(sp) + ldw r14, PT_R14(sp) + ldw r15, PT_R15(sp) + ldw ra, PT_RA(sp) + ldw fp, PT_FP(sp) + ldw gp, PT_GP(sp) + ldw r24, PT_ESTATUS(sp) + wrctl estatus, r24 + ldw ea, PT_EA(sp) + ldw sp, PT_SP(sp) /* Restore sp last */ +.endm + +.macro SAVE_SWITCH_STACK + addi sp, sp, -SWITCH_STACK_SIZE + stw r16, SW_R16(sp) + stw r17, SW_R17(sp) + stw r18, SW_R18(sp) + stw r19, SW_R19(sp) + stw r20, SW_R20(sp) + stw r21, SW_R21(sp) + stw r22, SW_R22(sp) + stw r23, SW_R23(sp) + stw fp, SW_FP(sp) + stw gp, SW_GP(sp) + stw ra, SW_RA(sp) +.endm + +.macro RESTORE_SWITCH_STACK + ldw r16, SW_R16(sp) + ldw r17, SW_R17(sp) + ldw r18, SW_R18(sp) + ldw r19, SW_R19(sp) + ldw r20, SW_R20(sp) + ldw r21, SW_R21(sp) + ldw r22, SW_R22(sp) + ldw r23, SW_R23(sp) + ldw fp, SW_FP(sp) + ldw gp, SW_GP(sp) + ldw ra, SW_RA(sp) + addi sp, sp, SWITCH_STACK_SIZE +.endm + +#endif /* __ASSEMBLY__ */ +#endif /* _ASM_NIOS2_ENTRY_H */ diff --git a/arch/nios2/include/asm/setup.h b/arch/nios2/include/asm/setup.h new file mode 100644 index 000000000000..dcbf8cf1a344 --- /dev/null +++ b/arch/nios2/include/asm/setup.h @@ -0,0 +1,38 @@ +/* + * Copyright (C) 2011 Tobias Klauser + * + * 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, see . + * + */ + +#ifndef _ASM_NIOS2_SETUP_H +#define _ASM_NIOS2_SETUP_H + +#include + +#ifndef __ASSEMBLY__ +#ifdef __KERNEL__ + +extern char exception_handler_hook[]; +extern char fast_handler[]; +extern char fast_handler_end[]; + +extern void pagetable_init(void); + +extern void setup_early_printk(void); + +#endif/* __KERNEL__ */ +#endif /* __ASSEMBLY__ */ + +#endif /* _ASM_NIOS2_SETUP_H */ -- cgit v1.2.3-59-g8ed1b