Rework initialization and interrupt stack support

Statically initialize the interrupt stack area
(_Configuration_Interrupt_stack_area_begin,
_Configuration_Interrupt_stack_area_end, and
_Configuration_Interrupt_stack_size) via <rtems/confdefs.h>.  Place the
interrupt stack area in a special section ".rtemsstack.interrupt".  Let
BSPs define the optimal placement of this section in their linker
command files (e.g. in a fast on-chip memory).

This change makes makes the CPU_HAS_SOFTWARE_INTERRUPT_STACK and
CPU_HAS_HARDWARE_INTERRUPT_STACK CPU port defines superfluous, since the
low level initialization code has all information available via global
symbols.

This change makes the CPU_ALLOCATE_INTERRUPT_STACK CPU port define
superfluous, since the interrupt stacks are allocated by confdefs.h for
all architectures.  There is no need for BSP-specific linker command
file magic (except the section placement), see previous ARM linker
command file as a bad example.

Remove _CPU_Install_interrupt_stack().  Initialize the hardware
interrupt stack in _CPU_Initialize() if necessary (e.g.
m68k_install_interrupt_stack()).

The optional _CPU_Interrupt_stack_setup() is still useful to customize
the registration of the interrupt stack area in the per-CPU information.

The initialization stack can reuse the interrupt stack, since

  * interrupts are disabled during the sequential system initialization,
    and

  * the boot_card() function does not return.

This stack resuse saves memory.

Changes per architecture:

arm:

  * Mostly replace the linker symbol based configuration of stacks with
    the standard <rtems/confdefs.h> configuration via
    CONFIGURE_INTERRUPT_STACK_SIZE.  The size of the FIQ, ABT and UND
    mode stack is still defined via linker symbols.  These modes are
    rarely used in applications and the default values provided by the
    BSP should be sufficient in most cases.

  * Remove the bsp_processor_count linker symbol hack used for the SMP
    support. This is possible since the interrupt stack area is now
    allocated by the linker and not allocated from the heap.  This makes
    some configure.ac stuff obsolete.  Remove the now superfluous BSP
    variants altcycv_devkit_smp and realview_pbx_a9_qemu_smp.

bfin:

  * Remove unused magic linker command file allocation of initialization
    stack.  Maybe a previous linker command file copy and paste problem?
    In the start.S the initialization stack is set to a hard coded value.

lm32, m32c, mips, nios2, riscv, sh, v850:

  * Remove magic linker command file allocation of initialization stack.
    Reuse interrupt stack for initialization stack.

m68k:

  * Remove magic linker command file allocation of initialization stack.
    Reuse interrupt stack for initialization stack.

powerpc:

  * Remove magic linker command file allocation of initialization stack.
    Reuse interrupt stack for initialization stack.

  * Used dedicated memory region (REGION_RTEMSSTACK) for the interrupt
    stack on BSPs using the shared linkcmds.base (replacement for
    REGION_RWEXTRA).

sparc:

  * Remove the hard coded initialization stack.  Use the interrupt stack
    for the initialization stack on the boot processor.  This saves
    16KiB of RAM.

Update #3459.

33 files changed, 45 insertions, 206 deletions

diff --git a/bsps/powerpc/beatnik/start/bspstart.c b/bsps/powerpc/beatnik/start/bspstart.c
index 83c6d2efa6..91913cd0ed 100644
--- a/bsps/powerpc/beatnik/start/bspstart.c
+++ b/bsps/powerpc/beatnik/start/bspstart.c
@@ -177,8 +177,8 @@ void bsp_start( void )
 {
   unsigned char  *stack;
   char           *chpt;
-  uint32_t       intrStackStart;
-  uint32_t       intrStackSize;
+  uintptr_t       intrStackStart;
+  uintptr_t       intrStackSize;
 
   Triv121PgTbl	pt=0;
 
@@ -239,7 +239,7 @@ void bsp_start( void )
    * This could be done latter (e.g in IRQ_INIT) but it helps to understand
    * some settings below...
    */
-  intrStackStart = (uint32_t)__rtems_end;
+  intrStackStart = (uintptr_t)_Configuration_Interrupt_stack_area_begin;
   intrStackSize  = rtems_configuration_get_interrupt_stack_size();
 
   /*
diff --git a/bsps/powerpc/gen5200/include/bsp.h b/bsps/powerpc/gen5200/include/bsp.h
index 40ac1116c5..015a8b1f3b 100644
--- a/bsps/powerpc/gen5200/include/bsp.h
+++ b/bsps/powerpc/gen5200/include/bsp.h
@@ -55,10 +55,6 @@ LINKER_SYMBOL(bsp_section_bss_start);
 LINKER_SYMBOL(bsp_section_bss_end);
 LINKER_SYMBOL(bsp_section_bss_size);
 
-LINKER_SYMBOL(bsp_interrupt_stack_start);
-LINKER_SYMBOL(bsp_interrupt_stack_end);
-LINKER_SYMBOL(bsp_interrupt_stack_size);
-
 LINKER_SYMBOL(bsp_work_area_start);
 
 LINKER_SYMBOL(MBAR);
diff --git a/bsps/powerpc/gen5200/start/bspstart.c b/bsps/powerpc/gen5200/start/bspstart.c
index 8b1558ce7b..0f981ffee0 100644
--- a/bsps/powerpc/gen5200/start/bspstart.c
+++ b/bsps/powerpc/gen5200/start/bspstart.c
@@ -154,8 +154,8 @@ void bsp_start(void)
   /* Initialize exception handler */
   ppc_exc_cache_wb_check = 0;
   ppc_exc_initialize(
-    (uintptr_t) bsp_interrupt_stack_start,
-    (uintptr_t) bsp_interrupt_stack_size
+    (uintptr_t) _Configuration_Interrupt_stack_area_begin,
+    rtems_configuration_get_interrupt_stack_size()
   );
   ppc_exc_set_handler(ASM_ALIGN_VECTOR, ppc_exc_alignment_handler);
 
diff --git a/bsps/powerpc/gen5200/start/linkcmds.gen5200_base b/bsps/powerpc/gen5200/start/linkcmds.gen5200_base
index a8841d2586..5ab30882ce 100644
--- a/bsps/powerpc/gen5200/start/linkcmds.gen5200_base
+++ b/bsps/powerpc/gen5200/start/linkcmds.gen5200_base
@@ -288,13 +288,6 @@ SECTIONS {
 	bsp_section_data_size = bsp_section_data_end - bsp_section_data_start;
 	bsp_section_bss_size = bsp_section_bss_end - bsp_section_bss_start;
 
-	/*
-	 * BSP: Interrupt stack
-	 */
-	bsp_interrupt_stack_start = bsp_section_bss_end;
-	bsp_interrupt_stack_end = bsp_interrupt_stack_start + 32k;
-	bsp_interrupt_stack_size = bsp_interrupt_stack_end - bsp_interrupt_stack_start;
-
 	.rtemsstack (NOLOAD) : {
 		*(SORT(.rtemsstack.*))
 	} > RAM
diff --git a/bsps/powerpc/gen83xx/include/bsp.h b/bsps/powerpc/gen83xx/include/bsp.h
index 59fd20de54..682dfc2986 100644
--- a/bsps/powerpc/gen83xx/include/bsp.h
+++ b/bsps/powerpc/gen83xx/include/bsp.h
@@ -53,10 +53,6 @@ LINKER_SYMBOL(bsp_section_bss_start);
 LINKER_SYMBOL(bsp_section_bss_end);
 LINKER_SYMBOL(bsp_section_bss_size);
 
-LINKER_SYMBOL(bsp_interrupt_stack_start);
-LINKER_SYMBOL(bsp_interrupt_stack_end);
-LINKER_SYMBOL(bsp_interrupt_stack_size);
-
 LINKER_SYMBOL(bsp_work_area_start);
 
 LINKER_SYMBOL(IMMRBAR);
diff --git a/bsps/powerpc/gen83xx/start/start.S b/bsps/powerpc/gen83xx/start/start.S
index b48a26b7c3..9272702d6b 100644
--- a/bsps/powerpc/gen83xx/start/start.S
+++ b/bsps/powerpc/gen83xx/start/start.S
@@ -417,7 +417,7 @@ start_code_in_ram:
 	li	r3, 0
 
 	/* Set start stack pointer */
-	LA	r1, start_stack_end
+	LA	r1, _Configuration_Interrupt_stack_area_end
 	stwu	r3, -4(r1)
 	stwu	r3, -4(r1)
 
@@ -520,10 +520,3 @@ mpc83xx_zero_4_tail:
 
 	/* Return */
 	blr
-
-.section ".bsp_rwextra", "aw", @nobits
-
-	/* Start stack area */
-.align 4
-.space 4096
-start_stack_end:
diff --git a/bsps/powerpc/haleakala/start/bspstart.c b/bsps/powerpc/haleakala/start/bspstart.c
index 5f7f5efb95..986582955a 100644
--- a/bsps/powerpc/haleakala/start/bspstart.c
+++ b/bsps/powerpc/haleakala/start/bspstart.c
@@ -66,9 +66,6 @@
 #include <ppc4xx/ppc405ex.h>
 
 #include <stdio.h>
-
-LINKER_SYMBOL(intrStack_start);
-LINKER_SYMBOL(intrStack_size);
 /*
  *  Driver configuration parameters
  */
@@ -188,8 +185,8 @@ void bsp_start( void )
    * Initialize default raw exception handlers.
    */
   ppc_exc_initialize(
-    (uintptr_t) intrStack_start,
-    (uintptr_t) intrStack_size
+    (uintptr_t) _Configuration_Interrupt_stack_area_begin,
+    rtems_configuration_get_interrupt_stack_size()
   );
 
   /*
diff --git a/bsps/powerpc/haleakala/start/dlentry.S b/bsps/powerpc/haleakala/start/dlentry.S
index 2395d89886..54fbb7668b 100644
--- a/bsps/powerpc/haleakala/start/dlentry.S
+++ b/bsps/powerpc/haleakala/start/dlentry.S
@@ -54,7 +54,7 @@
  *    .bss
  * see linker command file for section placement
  *
- *  The initial stack is set to stack.end
+ *  The initial stack is set to _Configuration_Interrupt_stack_area_end.
  *
  *  All the entry veneer has to do is to clear the BSS.
  */
@@ -98,7 +98,7 @@ sbss_length:
 sbss_addr:
 		.long	sbss.start
 stack_top:
-		.long	stack.end
+		.long	_Configuration_Interrupt_stack_area_end
 PUBLIC_VAR (text_addr)
 text_addr:
         .long   text.start
diff --git a/bsps/powerpc/haleakala/start/linkcmds b/bsps/powerpc/haleakala/start/linkcmds
index 98fea7f990..3bccc97c38 100644
--- a/bsps/powerpc/haleakala/start/linkcmds
+++ b/bsps/powerpc/haleakala/start/linkcmds
@@ -14,9 +14,6 @@ OUTPUT_ARCH(powerpc)
 ENTRY(download_entry)
 EXTERN(__vectors)
 
-kIntrStackSize = 16K;
-kMainStackSize = 64K;
-
 RamBase = DEFINED(RamBase) ? RamBase : 0;
 RamSize = DEFINED(RamSize) ? RamSize : 256M;
 HeapSize = DEFINED(HeapSize) ? HeapSize : 0x0;
@@ -246,19 +243,6 @@ SECTIONS
 
     bss.size = bss.end - bss.start;
     sbss.size = sbss.end - sbss.start;
-	          	
-    /* Interrupt stack: align to a cache-line boundary */
-    IntrStack_start = ALIGN(0x20);
-    . += kIntrStackSize;
-    intrStack = .;
-    PROVIDE(intrStackPtr = intrStack);
-    PROVIDE(intrStack_start = IntrStack_start);
-    PROVIDE(intrStack_size = kIntrStackSize);
-
- 	/* Main stack: align to a cache-line boundary */
-	stack.start = ALIGN(0x20);
-	. += kMainStackSize;
-	stack.end   = .;
 
     .rtemsstack (NOLOAD) : {
         *(SORT(.rtemsstack.*))
diff --git a/bsps/powerpc/motorola_powerpc/start/bspstart.c b/bsps/powerpc/motorola_powerpc/start/bspstart.c
index 7fb684c759..c420f6c19b 100644
--- a/bsps/powerpc/motorola_powerpc/start/bspstart.c
+++ b/bsps/powerpc/motorola_powerpc/start/bspstart.c
@@ -220,7 +220,7 @@ void bsp_start( void )
   /*
    * Initialize the interrupt related settings.
    */
-  intrStackStart = (uintptr_t) __rtems_end;
+  intrStackStart = (uintptr_t)_Configuration_Interrupt_stack_area_begin;
   intrStackSize = rtems_configuration_get_interrupt_stack_size();
 
   /*
diff --git a/bsps/powerpc/mpc55xxevb/start/start.S b/bsps/powerpc/mpc55xxevb/start/start.S
index 0a757e7ada..81893b6276 100644
--- a/bsps/powerpc/mpc55xxevb/start/start.S
+++ b/bsps/powerpc/mpc55xxevb/start/start.S
@@ -228,7 +228,7 @@ zero_intermediate_stack_loop:
 	bl	mpc55xx_start_early
 
 	/* Initialize start stack */
-	LA	r1, start_stack_end
+	LA	r1, _Configuration_Interrupt_stack_area_end
 	subi	r1, r1, 16
 	li	r0, 0
 	stw	r0, 0(r1)
@@ -289,11 +289,3 @@ mpc55xx_start_load_section:
 	cmpw	cr7, r3, r4
 	beqlr	cr7
 	b	memcpy
-
-	/* Start stack area */
-
-	.section	".bsp_rwextra", "aw", @nobits
-	.align	4
-	.space	4096
-
-start_stack_end:
diff --git a/bsps/powerpc/mpc8260ads/start/bspstart.c b/bsps/powerpc/mpc8260ads/start/bspstart.c
index 6f1cc72a2c..503d96b8a1 100644
--- a/bsps/powerpc/mpc8260ads/start/bspstart.c
+++ b/bsps/powerpc/mpc8260ads/start/bspstart.c
@@ -69,9 +69,6 @@ bool       bsp_serial_xon_xoff;
 bool       bsp_serial_cts_rts;
 uint32_t   bsp_serial_rate;
 
-extern char IntrStack_start [];
-extern char intrStack [];
-
 static void _BSP_GPLED0_on(void)
 {
   BCSR *csr;
@@ -142,10 +139,9 @@ void bsp_start(void)
 */
 
   /* Initialize exception handler */
-  /* FIXME: Interrupt stack begin and size */
   ppc_exc_initialize(
-    (uintptr_t) IntrStack_start,
-    (uintptr_t) intrStack - (uintptr_t) IntrStack_start
+    (uintptr_t) _Configuration_Interrupt_stack_area_begin,
+    rtems_configuration_get_interrupt_stack_size()
   );
 
   /* Initalize interrupt support */
diff --git a/bsps/powerpc/mpc8260ads/start/linkcmds b/bsps/powerpc/mpc8260ads/start/linkcmds
index 34fb69149b..84933b48e9 100644
--- a/bsps/powerpc/mpc8260ads/start/linkcmds
+++ b/bsps/powerpc/mpc8260ads/start/linkcmds
@@ -17,7 +17,6 @@ EXTERN(__vectors)
  *      number used there is not constant.  If this happens to you, edit
  *      the lines marked XXX below to use a constant value.
  */
-StackSize   = DEFINED(StackSize) ? StackSize : 0x8000;
 RamBase     = DEFINED(RamBase) ? RamBase : 0x0;
 RamSize     = DEFINED(RamSize) ? RamDiskSize : 0x0800000; /* 8M program ram */
 HeapSize    = DEFINED(HeapSize) ? HeapSize : 0x0;
@@ -289,16 +288,6 @@ SECTIONS
         _startmalloc = .;
      } >ram
 
-
-    /*
-     * Interrupt stack setup
-     */
-    IntrStack_start = ALIGN(0x10);
-    . += 0x4000;
-    intrStack = .;
-    PROVIDE(intrStackPtr = intrStack);
-
-
     clear_end = .;
 
     .rtemsstack (NOLOAD) : {
diff --git a/bsps/powerpc/mvme3100/start/bspstart.c b/bsps/powerpc/mvme3100/start/bspstart.c
index a073baa784..6f15b2d7a3 100644
--- a/bsps/powerpc/mvme3100/start/bspstart.c
+++ b/bsps/powerpc/mvme3100/start/bspstart.c
@@ -255,7 +255,7 @@ VpdBufRec          vpdData [] = {
   /*
    * Initialize the interrupt related settings.
    */
-  intrStackStart = (uintptr_t) __rtems_end;
+  intrStackStart = (uintptr_t) _Configuration_Interrupt_stack_area_begin;
   intrStackSize = rtems_configuration_get_interrupt_stack_size();
 
   /*
diff --git a/bsps/powerpc/mvme5500/start/bspstart.c b/bsps/powerpc/mvme5500/start/bspstart.c
index fc7057613a..47d413bc91 100644
--- a/bsps/powerpc/mvme5500/start/bspstart.c
+++ b/bsps/powerpc/mvme5500/start/bspstart.c
@@ -225,7 +225,7 @@ void bsp_start( void )
   /*
    * Initialize the interrupt related settings.
    */
-  intrStackStart = (uintptr_t) __rtems_end;
+  intrStackStart = (uintptr_t) _Configuration_Interrupt_stack_area_begin;
   intrStackSize = rtems_configuration_get_interrupt_stack_size();
 
   /*
diff --git a/bsps/powerpc/psim/start/start.S b/bsps/powerpc/psim/start/start.S
index 918321af5f..03cbdedc5b 100644
--- a/bsps/powerpc/psim/start/start.S
+++ b/bsps/powerpc/psim/start/start.S
@@ -47,7 +47,7 @@ FUNC_NAME(__atexit):			/* tell C's eabi-ctor's we have an atexit function */
 	.long	bsp_section_bss_end
 
 .Lstack = .-.LCTOC1			/* stack address if set by user */
-	.long	__stack
+	.long	_Configuration_Interrupt_stack_area_end
 
 	.text
 .Lptr:
@@ -89,7 +89,7 @@ _start:
 
 .Ldone:
 
-	lwz	r0,.Lstack(r5)		/* stack address or 0 */
+	lwz	r0,.Lstack(r5)	/* stack area or 0 */
 	cmplwi	1,r0,0			/* equal to 0? */
 	bc	12,6,.Lnostack		/* use default stack if == 0 */
 	mr	sp,r0			/* use user defined stack */
@@ -133,9 +133,3 @@ FUNC_NAME(bsp_reset):
 
 .Lstart:
 	.size	_start,.Lstart-_start
-
-	/* Start stack area */
-.section ".bsp_rwextra", "aw", @nobits
-.align 4
-.space 4096
-__stack:
diff --git a/bsps/powerpc/qemuppc/start/bspstart.c b/bsps/powerpc/qemuppc/start/bspstart.c
index 15cf9d4207..de3bba0797 100644
--- a/bsps/powerpc/qemuppc/start/bspstart.c
+++ b/bsps/powerpc/qemuppc/start/bspstart.c
@@ -42,8 +42,6 @@ uint32_t bsp_clicks_per_usec;
  * Memory on this board.
  */
 extern char RamSize[];
-extern char bsp_interrupt_stack_start[];
-extern char bsp_interrupt_stack_end[];
 uint32_t BSP_mem_size = (uint32_t)RamSize;
 
 /* Default decrementer exception handler */
@@ -89,8 +87,8 @@ void bsp_start( void )
   /*
    * Initialize the interrupt related settings.
    */
-  intrStackStart = (uintptr_t) bsp_interrupt_stack_start;
-  intrStackSize =  (uintptr_t) bsp_interrupt_stack_end - intrStackStart;
+  intrStackStart = (uintptr_t) _Configuration_Interrupt_stack_area_begin;
+  intrStackSize = rtems_configuration_get_interrupt_stack_size();
 
   BSP_mem_size = (uint32_t )RamSize;
 
diff --git a/bsps/powerpc/qemuppc/start/start.S b/bsps/powerpc/qemuppc/start/start.S
index 1ef7a3a02a..66cedca9a2 100644
--- a/bsps/powerpc/qemuppc/start/start.S
+++ b/bsps/powerpc/qemuppc/start/start.S
@@ -1,17 +1,13 @@
 #include <rtems/score/cpu.h>
 #include <rtems/powerpc/powerpc.h>
 
-#include <bspopts.h>
-
-	.global bsp_interrupt_stack_start
-	.global bsp_interrupt_stack_end
 	.global _start
 
 	.section .bsp_start_text,"awx",@progbits
 
 _start:
-	lis   %r1,bsp_interrupt_stack_start@h
-	ori   %r1,%r1,bsp_interrupt_stack_start@l
+	lis   %r1,_Configuration_Interrupt_stack_area_end@h
+	ori   %r1,%r1,_Configuration_Interrupt_stack_area_end@l
 	/* Make sure stack is properly aligned */
 	li    %r3, CPU_STACK_ALIGNMENT - 1
 	andc  %r1, %r1, %r3
@@ -42,11 +38,3 @@ __eabi:
 _reset:
 	b _start
 	.size _reset, . - _reset
-
-	/* Start stack area */
-	.section ".bsp_rwextra", "aw", @nobits
-	.align 4
-	.space 4096
-bsp_interrupt_stack_start:
-	.space 32768
-bsp_interrupt_stack_end:
diff --git a/bsps/powerpc/qoriq/start/start.S b/bsps/powerpc/qoriq/start/start.S
index 02505a6262..96e00bf38b 100644
--- a/bsps/powerpc/qoriq/start/start.S
+++ b/bsps/powerpc/qoriq/start/start.S
@@ -55,7 +55,9 @@ _start:
 	bl	.Linitearly
 
 	/* Get start stack */
-	LA	START_STACK, start_stack_end
+	LA	START_STACK, _Configuration_Interrupt_stack_area_begin
+	LA	r3, _Configuration_Interrupt_stack_size
+	add	START_STACK, START_STACK, r3
 
 	bl	.Linitmore
 
@@ -226,12 +228,10 @@ _start:
 	isync
 
 	/*
-	 * Initialize start stack.  Make sure that we do not share a cache line
-	 * with the heap block management, since initial stacks for the
-	 * secondary processors are allocated from the workspace.
+	 * Initialize start stack.  The stacks are statically allocated and
+	 * properly aligned.
 	 */
-	subi	r1, START_STACK, 2 * PPC_DEFAULT_CACHE_LINE_SIZE
-	clrrwi	r1, r1, PPC_DEFAULT_CACHE_LINE_POWER
+	subi	r1, START_STACK, PPC_DEFAULT_CACHE_LINE_SIZE
 	li	r0, 0
 	PPC_REG_STORE	r0, 0(r1)
 
@@ -540,9 +540,3 @@ bsp_exc_vector_base:
 
 /* Symbol provided for debugging and tracing */
 bsp_exc_vector_end:
-
-	/* Start stack area */
-	.section ".bsp_rwextra", "aw", @nobits
-	.align 4
-	.space 4096
-start_stack_end:
diff --git a/bsps/powerpc/shared/start/linkcmds.base b/bsps/powerpc/shared/start/linkcmds.base
index fa49edf7dd..4ad302e86b 100644
--- a/bsps/powerpc/shared/start/linkcmds.base
+++ b/bsps/powerpc/shared/start/linkcmds.base
@@ -321,7 +321,6 @@ SECTIONS {
 
 	.rtemsstack (NOLOAD) : ALIGN_WITH_INPUT {
 		bsp_section_rtemsstack_begin = .;
-		*(.bsp_rwextra)
 		*(SORT(.rtemsstack.*))
 		bsp_section_rtemsstack_end = .;
 	} > REGION_RTEMSSTACK AT > REGION_RTEMSSTACK
diff --git a/bsps/powerpc/ss555/start/bspstart.c b/bsps/powerpc/ss555/start/bspstart.c
index cf54d61d9e..5943e2bbd6 100644
--- a/bsps/powerpc/ss555/start/bspstart.c
+++ b/bsps/powerpc/ss555/start/bspstart.c
@@ -32,8 +32,6 @@
 
 SPR_RW(SPRG1)
 
-extern unsigned long intrStackPtr;
-
 /*
  *  Driver configuration parameters
  */
@@ -67,7 +65,7 @@ uint32_t _CPU_Counter_frequency(void)
  */
 void bsp_start(void)
 {
-  register unsigned char* intrStack;
+  char* intrStack;
 
   /*
    * Get CPU identification dynamically.  Note that the get_ppc_cpu_type()
@@ -80,7 +78,8 @@ void bsp_start(void)
   /*
    * Initialize some SPRG registers related to irq handling
    */
-  intrStack = (((unsigned char*)&intrStackPtr) - PPC_MINIMUM_STACK_FRAME_SIZE);
+  intrStack = (char *)_Configuration_Interrupt_stack_area_end -
+     PPC_MINIMUM_STACK_FRAME_SIZE;
   _write_SPRG1((unsigned int)intrStack);
 
   /*
diff --git a/bsps/powerpc/ss555/start/linkcmds b/bsps/powerpc/ss555/start/linkcmds
index 079dc84924..f3a41dd3a9 100644
--- a/bsps/powerpc/ss555/start/linkcmds
+++ b/bsps/powerpc/ss555/start/linkcmds
@@ -232,22 +232,6 @@ SECTIONS
 
   PROVIDE(_end = bss.end);
 
-  /*
-   * Initialization stack
-   */
-  InitStack_start = ALIGN(0x10);
-  . += 0x1000;
-  initStack = .;
-  PROVIDE(initStackPtr = initStack);
-
-  /*
-   * Interrupt stack
-   */
-  IntrStack_start = ALIGN(0x10);
-  . += 0x4000;
-  intrStack = .;
-  PROVIDE(intrStackPtr = intrStack);
-
   .rtemsstack (NOLOAD) : {
     *(SORT(.rtemsstack.*))
   }
diff --git a/bsps/powerpc/ss555/start/start.S b/bsps/powerpc/ss555/start/start.S
index 6a8ef85afc..f17c918b3e 100644
--- a/bsps/powerpc/ss555/start/start.S
+++ b/bsps/powerpc/ss555/start/start.S
@@ -220,7 +220,7 @@ base_addr:
  * Parameters from linker
  */
 stack_top:
-	.long	initStackPtr
+	.long	_Configuration_Interrupt_stack_area_end
 
 toc_pointer:
         .long   __GOT_START__
diff --git a/bsps/powerpc/t32mppc/start/start.S b/bsps/powerpc/t32mppc/start/start.S
index 7c32343f3d..e4066adb6f 100644
--- a/bsps/powerpc/t32mppc/start/start.S
+++ b/bsps/powerpc/t32mppc/start/start.S
@@ -34,7 +34,7 @@ _start:
 	mtspr	HID0, r0
 
 	/* Initialize start stack */
-	LWI	r1, start_stack_end
+	LA	r1, _Configuration_Interrupt_stack_area_end
 	subi	r1, r1, 16
 	li	r0, 0
 	stw	r0, 0(r1)
@@ -195,9 +195,3 @@ bsp_exc_vector_base:
 	PPC_REG_STORE	r3, GPR3_OFFSET(r1)
 	li	r3, 35
 	b	ppc_exc_fatal_normal
-
-	/* Start stack area */
-	.section ".bsp_rwextra", "aw", @nobits
-	.align 4
-	.space 4096
-start_stack_end:
diff --git a/bsps/powerpc/tqm8xx/include/bsp.h b/bsps/powerpc/tqm8xx/include/bsp.h
index 5c8eae81b4..8e84ee883e 100644
--- a/bsps/powerpc/tqm8xx/include/bsp.h
+++ b/bsps/powerpc/tqm8xx/include/bsp.h
@@ -53,10 +53,6 @@ LINKER_SYMBOL( bsp_section_bss_start);
 LINKER_SYMBOL( bsp_section_bss_end);
 LINKER_SYMBOL( bsp_section_bss_size);
 
-LINKER_SYMBOL( bsp_interrupt_stack_start);
-LINKER_SYMBOL( bsp_interrupt_stack_end);
-LINKER_SYMBOL( bsp_interrupt_stack_size);
-
 LINKER_SYMBOL( bsp_work_area_start);
 
 #ifndef ASM
diff --git a/bsps/powerpc/tqm8xx/start/bspstart.c b/bsps/powerpc/tqm8xx/start/bspstart.c
index b2d765c9c4..2d0b8e3c7e 100644
--- a/bsps/powerpc/tqm8xx/start/bspstart.c
+++ b/bsps/powerpc/tqm8xx/start/bspstart.c
@@ -99,11 +99,6 @@ uint32_t _CPU_Counter_frequency(void)
 
 void bsp_start( void)
 {
-
-  uintptr_t interrupt_stack_start = (uintptr_t) bsp_interrupt_stack_start;
-  uintptr_t interrupt_stack_size = (uintptr_t) bsp_interrupt_stack_end
-    - interrupt_stack_start;
-
   /*
    * Get CPU identification dynamically. Note that the get_ppc_cpu_type()
    * function stores the result in global variables so that it can be used
@@ -149,7 +144,10 @@ void bsp_start( void)
   bsp_clicks_per_usec = bsp_time_base_frequency / 1000000;
 
   /* Initialize exception handler */
-  ppc_exc_initialize(interrupt_stack_start, interrupt_stack_size);
+  ppc_exc_initialize(
+    (uintptr_t) _Configuration_Interrupt_stack_area_begin,
+    rtems_configuration_get_interrupt_stack_size()
+  );
 
   /* Initalize interrupt support */
   bsp_interrupt_initialize();
diff --git a/bsps/powerpc/tqm8xx/start/start.S b/bsps/powerpc/tqm8xx/start/start.S
index 92bda3fd6d..b16b92e1e2 100644
--- a/bsps/powerpc/tqm8xx/start/start.S
+++ b/bsps/powerpc/tqm8xx/start/start.S
@@ -26,8 +26,6 @@
 .extern boot_card
 
 PUBLIC_VAR (_start)
-PUBLIC_VAR (bsp_interrupt_stack_start)
-PUBLIC_VAR (bsp_interrupt_stack_end)
 
 .section ".bsp_start_text", "ax"
 _start:
@@ -119,8 +117,8 @@ start_code_in_ram:
 	 */
 
 	/* Set stack pointer (common for RAM/ROM startup) */
-	LA	r1, bsp_section_text_begin
-        addi    r1, r1, -0x10 /* Set up stack pointer = beginning of text section - 0x10 */
+	LA	r1, _Configuration_Interrupt_stack_area_end
+        addi    r1, r1, -0x10
 
 	/* Create NULL */
 	li r0, 0
@@ -285,10 +283,3 @@ mpc8xx_zero_4_tail:
 	blr
 
 end_reloc_startup:
-
-	/* Interrupt stack */
-	.section ".bsp_rwextra", "aw", @nobits
-	.align 4
-bsp_interrupt_stack_start:
-	.space 32768
-bsp_interrupt_stack_end:
diff --git a/bsps/powerpc/virtex4/start/bspstart.c b/bsps/powerpc/virtex4/start/bspstart.c
index 40cd710a58..93890c1623 100644
--- a/bsps/powerpc/virtex4/start/bspstart.c
+++ b/bsps/powerpc/virtex4/start/bspstart.c
@@ -85,9 +85,6 @@ LINKER_SYMBOL(RamSize);
 LINKER_SYMBOL(__bsp_ram_start);
 LINKER_SYMBOL(__bsp_ram_end);
 LINKER_SYMBOL(__rtems_end);
-LINKER_SYMBOL(_stack);
-LINKER_SYMBOL(StackSize);
-LINKER_SYMBOL(__stack_base);
 LINKER_SYMBOL(WorkAreaBase);
 LINKER_SYMBOL(MsgAreaBase);
 LINKER_SYMBOL(MsgAreaSize);
@@ -174,7 +171,7 @@ void bsp_start(void)
   /*
    * Initialize the interrupt related settings.
    */
-  intrStackStart = CPU_UP_ALIGN((uint32_t)__bsp_ram_start);
+  intrStackStart = (uintptr_t) _Configuration_Interrupt_stack_area_begin;
   intrStackSize  = rtems_configuration_get_interrupt_stack_size();
 
   ppc_exc_initialize(intrStackStart, intrStackSize);
@@ -184,14 +181,12 @@ void bsp_start(void)
          "RAM:              %p                    %p\n"
          "RTEMS:                           %p\n"
          "Interrupt Stack:  0x%08x              0x%x\n"
-         "Stack:            %p             %p          %p\n"
          "Workspace:        %p             %p\n"
          "MsgArea:          %p             %p\n"
          "Physical RAM                     %p\n",
          RamBase,        RamSize,
          __rtems_end,
          intrStackStart,                intrStackSize,
-         __stack_base,   _stack,        StackSize,
          WorkAreaBase,   __bsp_ram_end,
          MsgAreaBase,    MsgAreaSize,
          __phy_ram_end);
diff --git a/bsps/powerpc/virtex4/start/linkcmds b/bsps/powerpc/virtex4/start/linkcmds
index 472c797fd2..66705168ef 100644
--- a/bsps/powerpc/virtex4/start/linkcmds
+++ b/bsps/powerpc/virtex4/start/linkcmds
@@ -15,8 +15,6 @@ EXTERN(__vectors)
 MsgAreaSize       = DEFINED(MsgAreaSize)   ? MsgAreaSize   : 1M;
 RamBase           = DEFINED(RamBase)       ? RamBase       : 0x0;
 RamSize           = DEFINED(RamSize)       ? RamSize       : 128M - MsgAreaSize;
-IntrStackSize     = DEFINED(IntrStackSize) ? IntrStackSize : 16K;
-StackSize         = DEFINED(StackSize)     ? StackSize     : 64K;
 HeapSize          = DEFINED(HeapSize)      ? HeapSize      : 0; /* 0=Use def */
 
 
@@ -251,15 +249,6 @@ SECTIONS
   .               = ALIGN(0x10);        /* Align to a cache-line boundary */
   PROVIDE(__bsp_ram_start = .);
 
-  /* Interrupt stack: aligned on a cache-line boundary */
-  .              += IntrStackSize;
-  __intrStack     = .;
-
-  /* Main stack lives here */
-  _stack          = ALIGN(0x10); 	/* Align to a cache-line boundary */
-  .              += StackSize;
-  __stack_base    = .;                  /* Initial stack builds downwards */
-
   .rtemsstack (NOLOAD) : {
     *(SORT(.rtemsstack.*))
   } >RAM
diff --git a/bsps/powerpc/virtex4/start/start.S b/bsps/powerpc/virtex4/start/start.S
index 21948409bf..d4b8419551 100644
--- a/bsps/powerpc/virtex4/start/start.S
+++ b/bsps/powerpc/virtex4/start/start.S
@@ -82,7 +82,7 @@
  *    .bss
  *  see linker command file for section placement
  *
- *  The initial stack is set to __stack_base.
+ *  The initial stack is set to _Configuration_Interrupt_stack_area_end.
  *
  */
 
@@ -109,7 +109,7 @@ bss_length:
 bss_addr:
         .long   __bss_start
 stack_top:
-        .long   __stack_base
+        .long   _Configuration_Interrupt_stack_area_end
 dccr_contents:
         .long   __dccr
 iccr_contents:
diff --git a/bsps/powerpc/virtex5/start/bspstart.c b/bsps/powerpc/virtex5/start/bspstart.c
index 6457143d20..8297b164b6 100644
--- a/bsps/powerpc/virtex5/start/bspstart.c
+++ b/bsps/powerpc/virtex5/start/bspstart.c
@@ -86,9 +86,6 @@ LINKER_SYMBOL(RamSize);
 LINKER_SYMBOL(__bsp_ram_start);
 LINKER_SYMBOL(__bsp_ram_end);
 LINKER_SYMBOL(__rtems_end);
-LINKER_SYMBOL(_stack);
-LINKER_SYMBOL(StackSize);
-LINKER_SYMBOL(__stack_base);
 LINKER_SYMBOL(WorkAreaBase);
 LINKER_SYMBOL(MsgAreaBase);
 LINKER_SYMBOL(MsgAreaSize);
@@ -193,7 +190,7 @@ void bsp_start(void)
   /*
    * Initialize the interrupt related settings.
    */
-  intrStackStart = CPU_UP_ALIGN((uint32_t)__bsp_ram_start);
+  intrStackStart = (uintptr_t)_Configuration_Interrupt_stack_area_begin;
   intrStackSize  = rtems_configuration_get_interrupt_stack_size();
 
   ppc_exc_initialize(intrStackStart, intrStackSize);
@@ -203,14 +200,12 @@ void bsp_start(void)
          "RAM:              %p                    %p\n"
          "RTEMS:                           %p\n"
          "Interrupt Stack:  0x%08x              0x%x\n"
-         "Stack:            %p             %p          %p\n"
          "Workspace:        %p             %p\n"
          "MsgArea:          %p             %p\n"
          "Physical RAM                     %p\n",
          RamBase,        RamSize,
          __rtems_end,
          intrStackStart,                intrStackSize,
-         __stack_base,   _stack,        StackSize,
          WorkAreaBase,   __bsp_ram_end,
          MsgAreaBase,    MsgAreaSize,
          __phy_ram_end);
diff --git a/bsps/powerpc/virtex5/start/linkcmds b/bsps/powerpc/virtex5/start/linkcmds
index 4fd5243f3f..0cb4b4e752 100644
--- a/bsps/powerpc/virtex5/start/linkcmds
+++ b/bsps/powerpc/virtex5/start/linkcmds
@@ -15,8 +15,6 @@ EXTERN(__vectors)
 MsgAreaSize       = DEFINED(MsgAreaSize)   ? MsgAreaSize   : 1M;
 RamBase           = DEFINED(RamBase)       ? RamBase       : 0x0;
 RamSize           = DEFINED(RamSize)       ? RamSize       : 2048M - MsgAreaSize;
-IntrStackSize     = DEFINED(IntrStackSize) ? IntrStackSize : 16K;
-StackSize         = DEFINED(StackSize)     ? StackSize     : 64K;
 HeapSize          = DEFINED(HeapSize)      ? HeapSize      : 0; /* 0=Use def */
 
 
@@ -251,15 +249,6 @@ SECTIONS
   .               = ALIGN(0x20);        /* Align to a cache-line boundary */
   PROVIDE(__bsp_ram_start = .);
 
-  /* Interrupt stack: aligned on a cache-line boundary */
-  .              += IntrStackSize;
-  __intrStack     = .;
-
-  /* Main stack lives here */
-  _stack          = ALIGN(0x20); 	/* Align to a cache-line boundary */
-  .              += StackSize;
-  __stack_base    = .;                  /* Initial stack builds downwards */
-
   .rtemsstack (NOLOAD) : {
     *(SORT(.rtemsstack.*))
   } >RAM
diff --git a/bsps/powerpc/virtex5/start/start.S b/bsps/powerpc/virtex5/start/start.S
index 2b12c18c89..b63c103b14 100644
--- a/bsps/powerpc/virtex5/start/start.S
+++ b/bsps/powerpc/virtex5/start/start.S
@@ -86,7 +86,7 @@
  *    .bss
  *  see linker command file for section placement
  *
- *  The initial stack is set to __stack_base
+ *  The initial stack is set to _Configuration_Interrupt_stack_area_end.
  *
  *  All the entry veneer has to do is to clear the BSS.
  */
@@ -114,7 +114,7 @@ bss_length:
 bss_addr:
         .long   __bss_start
 stack_top:
-        .long   __stack_base
+        .long   _Configuration_Interrupt_stack_area_end
 
 
         .eject