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/*
* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
* 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 <asm/processor.h>
#include <asm/registers.h>
#include <asm/asm-offsets.h>
/*
* 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)
movi r24, -1
stw r24, 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 */
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