1/*
  2 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
  3 * Copyright (C) 2004 Microtronix Datacom Ltd.
  4 *
  5 * This file is subject to the terms and conditions of the GNU General Public
  6 * License. See the file "COPYING" in the main directory of this archive
  7 * for more details.
  8 */
  9
 10#ifndef _ASM_NIOS2_ENTRY_H
 11#define _ASM_NIOS2_ENTRY_H
 12
 13#ifdef __ASSEMBLY__
 14
 15#include <asm/processor.h>
 16#include <asm/registers.h>
 17#include <asm/asm-offsets.h>
 18
 19/*
 20 * Standard Nios2 interrupt entry and exit macros.
 21 * Must be called with interrupts disabled.
 22 */
 23.macro SAVE_ALL
 24	rdctl	r24, estatus
 25	andi	r24, r24, ESTATUS_EU
 26	beq	r24, r0, 1f /* In supervisor mode, already on kernel stack */
 27
 28	movia	r24, _current_thread	/* Switch to current kernel stack */
 29	ldw	r24, 0(r24)		/* using the thread_info */
 30	addi	r24, r24, THREAD_SIZE-PT_REGS_SIZE
 31	stw	sp, PT_SP(r24)		/* Save user stack before changing */
 32	mov	sp, r24
 33	br	2f
 34
 351 :	mov	r24, sp
 36	addi	sp, sp, -PT_REGS_SIZE	/* Backup the kernel stack pointer */
 37	stw	r24, PT_SP(sp)
 382 :	stw	r1, PT_R1(sp)
 39	stw	r2, PT_R2(sp)
 40	stw	r3, PT_R3(sp)
 41	stw	r4, PT_R4(sp)
 42	stw	r5, PT_R5(sp)
 43	stw	r6, PT_R6(sp)
 44	stw	r7, PT_R7(sp)
 45	stw	r8, PT_R8(sp)
 46	stw	r9, PT_R9(sp)
 47	stw	r10, PT_R10(sp)
 48	stw	r11, PT_R11(sp)
 49	stw	r12, PT_R12(sp)
 50	stw	r13, PT_R13(sp)
 51	stw	r14, PT_R14(sp)
 52	stw	r15, PT_R15(sp)
 53	stw	r2, PT_ORIG_R2(sp)
 54	stw	r7, PT_ORIG_R7(sp)
 55
 56	stw	ra, PT_RA(sp)
 57	stw	fp, PT_FP(sp)
 58	stw	gp, PT_GP(sp)
 59	rdctl	r24, estatus
 60	stw	r24, PT_ESTATUS(sp)
 61	stw	ea, PT_EA(sp)
 62.endm
 63
 64.macro RESTORE_ALL
 65	ldw	r1, PT_R1(sp)		/* Restore registers */
 66	ldw	r2, PT_R2(sp)
 67	ldw	r3, PT_R3(sp)
 68	ldw	r4, PT_R4(sp)
 69	ldw	r5, PT_R5(sp)
 70	ldw	r6, PT_R6(sp)
 71	ldw	r7, PT_R7(sp)
 72	ldw	r8, PT_R8(sp)
 73	ldw	r9, PT_R9(sp)
 74	ldw	r10, PT_R10(sp)
 75	ldw	r11, PT_R11(sp)
 76	ldw	r12, PT_R12(sp)
 77	ldw	r13, PT_R13(sp)
 78	ldw	r14, PT_R14(sp)
 79	ldw	r15, PT_R15(sp)
 80	ldw	ra, PT_RA(sp)
 81	ldw	fp, PT_FP(sp)
 82	ldw	gp, PT_GP(sp)
 83	ldw	r24, PT_ESTATUS(sp)
 84	wrctl	estatus, r24
 85	ldw	ea, PT_EA(sp)
 86	ldw	sp, PT_SP(sp)		/* Restore sp last */
 87.endm
 88
 89.macro	SAVE_SWITCH_STACK
 90	addi	sp, sp, -SWITCH_STACK_SIZE
 91	stw	r16, SW_R16(sp)
 92	stw	r17, SW_R17(sp)
 93	stw	r18, SW_R18(sp)
 94	stw	r19, SW_R19(sp)
 95	stw	r20, SW_R20(sp)
 96	stw	r21, SW_R21(sp)
 97	stw	r22, SW_R22(sp)
 98	stw	r23, SW_R23(sp)
 99	stw	fp, SW_FP(sp)
100	stw	gp, SW_GP(sp)
101	stw	ra, SW_RA(sp)
102.endm
103
104.macro	RESTORE_SWITCH_STACK
105	ldw	r16, SW_R16(sp)
106	ldw	r17, SW_R17(sp)
107	ldw	r18, SW_R18(sp)
108	ldw	r19, SW_R19(sp)
109	ldw	r20, SW_R20(sp)
110	ldw	r21, SW_R21(sp)
111	ldw	r22, SW_R22(sp)
112	ldw	r23, SW_R23(sp)
113	ldw	fp, SW_FP(sp)
114	ldw	gp, SW_GP(sp)
115	ldw	ra, SW_RA(sp)
116	addi	sp, sp, SWITCH_STACK_SIZE
117.endm
118
119#endif /* __ASSEMBLY__ */
120#endif /* _ASM_NIOS2_ENTRY_H */