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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)
- 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 */
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