| /* |
| * 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 */ |
