27d22413e6
This patch adds the kernel booting and the initial setup code. Signed-off-by: Ley Foon Tan <lftan@altera.com>
120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
/*
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* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
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* Copyright (C) 2004 Microtronix Datacom Ltd.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_NIOS2_ENTRY_H
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#define _ASM_NIOS2_ENTRY_H
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#ifdef __ASSEMBLY__
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#include <asm/processor.h>
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#include <asm/registers.h>
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#include <asm/asm-offsets.h>
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/*
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* Standard Nios2 interrupt entry and exit macros.
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* Must be called with interrupts disabled.
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*/
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.macro SAVE_ALL
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rdctl r24, estatus
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andi r24, r24, ESTATUS_EU
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beq r24, r0, 1f /* In supervisor mode, already on kernel stack */
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movia r24, _current_thread /* Switch to current kernel stack */
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ldw r24, 0(r24) /* using the thread_info */
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addi r24, r24, THREAD_SIZE-PT_REGS_SIZE
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stw sp, PT_SP(r24) /* Save user stack before changing */
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mov sp, r24
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br 2f
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1 : mov r24, sp
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addi sp, sp, -PT_REGS_SIZE /* Backup the kernel stack pointer */
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stw r24, PT_SP(sp)
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2 : stw r1, PT_R1(sp)
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stw r2, PT_R2(sp)
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stw r3, PT_R3(sp)
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stw r4, PT_R4(sp)
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stw r5, PT_R5(sp)
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stw r6, PT_R6(sp)
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stw r7, PT_R7(sp)
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stw r8, PT_R8(sp)
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stw r9, PT_R9(sp)
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stw r10, PT_R10(sp)
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stw r11, PT_R11(sp)
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stw r12, PT_R12(sp)
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stw r13, PT_R13(sp)
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stw r14, PT_R14(sp)
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stw r15, PT_R15(sp)
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stw r2, PT_ORIG_R2(sp)
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stw r7, PT_ORIG_R7(sp)
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stw ra, PT_RA(sp)
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stw fp, PT_FP(sp)
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stw gp, PT_GP(sp)
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rdctl r24, estatus
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stw r24, PT_ESTATUS(sp)
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stw ea, PT_EA(sp)
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.endm
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.macro RESTORE_ALL
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ldw r1, PT_R1(sp) /* Restore registers */
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ldw r2, PT_R2(sp)
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ldw r3, PT_R3(sp)
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ldw r4, PT_R4(sp)
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ldw r5, PT_R5(sp)
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ldw r6, PT_R6(sp)
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ldw r7, PT_R7(sp)
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ldw r8, PT_R8(sp)
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ldw r9, PT_R9(sp)
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ldw r10, PT_R10(sp)
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ldw r11, PT_R11(sp)
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ldw r12, PT_R12(sp)
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ldw r13, PT_R13(sp)
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ldw r14, PT_R14(sp)
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ldw r15, PT_R15(sp)
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ldw ra, PT_RA(sp)
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ldw fp, PT_FP(sp)
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ldw gp, PT_GP(sp)
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ldw r24, PT_ESTATUS(sp)
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wrctl estatus, r24
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ldw ea, PT_EA(sp)
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ldw sp, PT_SP(sp) /* Restore sp last */
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.endm
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.macro SAVE_SWITCH_STACK
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addi sp, sp, -SWITCH_STACK_SIZE
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stw r16, SW_R16(sp)
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stw r17, SW_R17(sp)
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stw r18, SW_R18(sp)
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stw r19, SW_R19(sp)
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stw r20, SW_R20(sp)
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stw r21, SW_R21(sp)
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stw r22, SW_R22(sp)
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stw r23, SW_R23(sp)
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stw fp, SW_FP(sp)
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stw gp, SW_GP(sp)
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stw ra, SW_RA(sp)
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.endm
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.macro RESTORE_SWITCH_STACK
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ldw r16, SW_R16(sp)
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ldw r17, SW_R17(sp)
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ldw r18, SW_R18(sp)
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ldw r19, SW_R19(sp)
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ldw r20, SW_R20(sp)
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ldw r21, SW_R21(sp)
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ldw r22, SW_R22(sp)
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ldw r23, SW_R23(sp)
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ldw fp, SW_FP(sp)
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ldw gp, SW_GP(sp)
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ldw ra, SW_RA(sp)
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addi sp, sp, SWITCH_STACK_SIZE
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.endm
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_NIOS2_ENTRY_H */
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