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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 */
|
|
