nios2: use gen_isr_tables mechanism

Change-Id: If1ffcedf86a015789b42e7aec45dae3cc58f74fa
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>

arch/common/Makefile.gen_isr_tables

@@ -5,6 +5,9 @@ OUTPUT_OBJ := isr_tables.o
 ifeq ($(ARCH),arm)
 OUTPUT_FORMAT := elf32-littlearm
 OUTPUT_ARCH := arm
+else ifeq ($(ARCH),nios2)
+OUTPUT_FORMAT := elf32-littlenios2
+OUTPUT_ARCH := nios2
 else
 $(error Output formats not defined for this architecture)
 endif

arch/nios2/Kconfig

@@ -37,6 +37,16 @@ config XIP
 	bool
 	default y
 
+config GEN_ISR_TABLES
+	default y
+
+config GEN_IRQ_VECTOR_TABLE
+	default n
+
+config NUM_IRQS
+	int
+	default 32
+
 config IRQ_OFFLOAD
 	bool "Enable IRQ offload"
 	default n

arch/nios2/core/Makefile

@@ -3,6 +3,6 @@ ccflags-y += -I$(srctree)/arch/$(ARCH)/include
 
 obj-y += reset.o irq_manage.o fatal.o swap.o thread.o \
 	 cpu_idle.o irq_offload.o prep_c.o crt0.o \
-	 exception.o sw_isr_table.o cache.o
+	 exception.o cache.o
 
 obj-$(CONFIG_IRQ_OFFLOAD) += irq_offload.o

arch/nios2/core/sw_isr_table.S

@@ -1,49 +0,0 @@
-/* sw_isr_table.S - ISR table for static ISR declarations for ARC */
-
-/*
- * Copyright (c) 2015 Intel Corporation
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <toolchain.h>
-#include <sections.h>
-#include <arch/cpu.h>
-
-/*
- * enable preprocessor features, such
- * as %expr - evaluate the expression and use it as a string
- */
-.altmacro
-
-/*
- * Define an ISR table entry
- * Define symbol as weak and give the section .gnu.linkonce
- * prefix. This allows linker overload the symbol and the
- * whole section by the one defined by a device driver
- */
-.macro _isr_table_entry_declare index
-	WDATA(_isr_irq\index)
-	.section .gnu.linkonce.isr_irq\index
-	_isr_irq\index: .word 0xABAD1DEA, _irq_spurious
-.endm
-
-/*
- * Declare the ISR table
- */
-.macro _isr_table_declare from, to
-	counter = \from
-	.rept (\to - \from)
-		_isr_table_entry_declare %counter
-		counter = counter + 1
-	.endr
-.endm
-
-GTEXT(_irq_spurious)
-GDATA(_sw_isr_table)
-
-.section .isr_irq0
-.align
-_sw_isr_table:
-
-_isr_table_declare 0 NIOS2_NIRQ

include/arch/nios2/arch.h

@@ -74,14 +74,12 @@ typedef unsigned int vaddr_t;
  */
 #define _ARCH_IRQ_CONNECT(irq_p, priority_p, isr_p, isr_param_p, flags_p) \
 ({ \
-	enum { IRQ = irq_p }; \
+	_ISR_DECLARE(irq_p, 0, isr_p, isr_param_p); \
-	static struct _isr_table_entry _CONCAT(_isr_irq, irq_p) \
-		__attribute__ ((used))  \
-		__attribute__ ((section(STRINGIFY(_CONCAT(.gnu.linkonce.isr_irq, irq_p))))) = \
-			{isr_param_p, isr_p}; \
 	irq_p; \
 })
 
+extern void _irq_spurious(void *unused);
+
 static ALWAYS_INLINE unsigned int _arch_irq_lock(void)
 {
 	unsigned int key, tmp;

include/arch/nios2/linker.ld

@@ -61,6 +61,9 @@ MEMORY
     RESET (rx) : ORIGIN = _RESET_VECTOR, LENGTH = 0x20
     FLASH (rx) : ORIGIN = _RESET_VECTOR + 0x20 , LENGTH = (_ROM_SIZE - 0x20)
     SRAM  (wx) : ORIGIN = _EXC_VECTOR, LENGTH = _RAM_SIZE - (_EXC_VECTOR - _RAM_ADDR)
+    /* Used by and documented in include/linker/intlist.ld */
+    IDT_LIST  (wx)      : ORIGIN = 0xFFFFF7FF, LENGTH = 2K
+
     }
 
 #else
@@ -69,6 +72,9 @@ MEMORY
     {
     RESET (wx) : ORIGIN = _RESET_VECTOR, LENGTH = 0x20
     SRAM  (wx) : ORIGIN = _EXC_VECTOR, LENGTH = _RAM_SIZE - (_EXC_VECTOR - _RAM_ADDR)
+
+    /* Used by and documented in include/linker/intlist.ld */
+    IDT_LIST  (wx)      : ORIGIN = 0xFFFFF7FF, LENGTH = 2K
 }
 #endif
 
@@ -158,18 +164,9 @@ SECTIONS
 
     SECTION_DATA_PROLOGUE(_DATA_SECTION_NAME,,)
         {
-
+#ifdef CONFIG_GEN_SW_ISR_TABLE
-        KEEP(*(.isr_irq*))
+	KEEP(*(SW_ISR_TABLE))
-
+#endif
-        /* sections for IRQ0-9 */
-        KEEP(*(SORT(.gnu.linkonce.isr_irq[0-9])))
-
-        /* sections for IRQ10-99 */
-        KEEP(*(SORT(.gnu.linkonce.isr_irq[0-9][0-9])))
-
-        /* sections for IRQ100-999 */
-        KEEP(*(SORT(.gnu.linkonce.isr_irq[0-9][0-9][0-9])))
-
         *(.data)
         *(".data.*")
 
@@ -241,6 +238,10 @@ SECTIONS
 #ifdef CONFIG_CUSTOM_SECTIONS_LD
 /* Located in project source directory */
 #include <custom-sections.ld>
+#endif
+
+#ifdef CONFIG_GEN_ISR_TABLES
+#include <linker/intlist.ld>
 #endif
 
     }