remove depratated powerpc exception API

3 files changed, 0 insertions, 781 deletions

diff --git a/c/src/lib/libbsp/powerpc/shared/irq/README.deprecated b/c/src/lib/libbsp/powerpc/shared/irq/README.deprecated
deleted file mode 100644
index 6a898f150d..0000000000
--- a/c/src/lib/libbsp/powerpc/shared/irq/README.deprecated
+++ /dev/null
@@ -1,17 +0,0 @@
-The files:
-
-	irq.c, irq_asm.S
-
-in this directory are DEPRECATED.
-
-DO NOT COPY/MODIFY FOR NEW BSPs
-
-as this has created major maintenance headache.
-Consider using the library in
-
-libcpu/powercp/new-exceptions/bspsupport/
-
-which implements the same functionality in a
-(hopefully) generic way.
-
-T.S., 12/2007
diff --git a/c/src/lib/libbsp/powerpc/shared/irq/irq.c b/c/src/lib/libbsp/powerpc/shared/irq/irq.c
deleted file mode 100644
index 36c5c04330..0000000000
--- a/c/src/lib/libbsp/powerpc/shared/irq/irq.c
+++ /dev/null
@@ -1,349 +0,0 @@
-/*
- *
- *  This file contains the PIC-independent implementation of the
- *  functions described in irq.h
- *
- *  Copyright (C) 1998, 1999 valette@crf.canon.fr
- *
- *  The license and distribution terms for this file may be
- *  found in found in the file LICENSE in this distribution or at
- *  http://www.rtems.com/license/LICENSE.
- *
- *  $Id$
- */
-
-#include <stdlib.h>
-
-#include <bsp.h>
-#include <bsp/irq_supp.h>
-#include <rtems/irq.h>
-#include <rtems/score/apiext.h>  /* for post ISR signal processing */
-#include <libcpu/raw_exception.h>
-#include <bsp/vectors.h>
-#include <stdlib.h>
-
-#include <rtems/bspIo.h> /* for printk */
-
-extern unsigned int external_exception_vector_prolog_code_size[];
-extern void external_exception_vector_prolog_code();
-extern unsigned int decrementer_exception_vector_prolog_code_size[];
-extern void decrementer_exception_vector_prolog_code();
-
-/*
- * default handler connected on each irq after bsp initialization
- */
-static rtems_irq_connect_data  default_rtems_entry;
-
-/*
- * location used to store initial tables used for interrupt
- * management.
- */
-static rtems_irq_global_settings*   internal_config;
-static rtems_irq_connect_data*    rtems_hdl_tbl;
-
-/*
- * ------------------------ RTEMS Irq helper functions ----------------
- */
-
-/*
- * This function check that the value given for the irq line
- * is valid.
- */
-
-static int isValidInterrupt(int irq)
-{
-  if ( (irq < internal_config->irqBase) ||
-       (irq >= internal_config->irqBase + internal_config->irqNb))
-    return 0;
-  return 1;
-}
-
-/*
- * ------------------- RTEMS Shared Irq Handler Mngt Routines ------------
- */
-int BSP_install_rtems_shared_irq_handler  (const rtems_irq_connect_data* irq)
-{
-  rtems_interrupt_level   level;
-  rtems_irq_connect_data* vchain;
-
-  if (!isValidInterrupt(irq->name)) {
-    printk("Invalid interrupt vector %d\n",irq->name);
-    return 0;
-  }
-
-  rtems_interrupt_disable(level);
-
-  if ( (int)rtems_hdl_tbl[irq->name].next_handler  == -1 ) {
-    rtems_interrupt_enable(level);
-    printk(
-      "IRQ vector %d already connected to an unshared handler\n",
-      irq->name
-    );
-    return 0;
-  }
-
-   vchain = (rtems_irq_connect_data*)malloc(sizeof(rtems_irq_connect_data));
-
-  /* save off topmost handler */
-  vchain[0]= rtems_hdl_tbl[irq->name];
-
-  /*
-   * store the data provided by user
-   */
-  rtems_hdl_tbl[irq->name] = *irq;
-
-  /* link chain to new topmost handler */
-  rtems_hdl_tbl[irq->name].next_handler = (void *)vchain;
-
-  /*
-   * enable_irq_at_pic is supposed to ignore
-   * requests to disable interrupts outside
-   * of the range handled by the PIC
-   */
-  BSP_enable_irq_at_pic(irq->name);
-
-  /*
-   * Enable interrupt on device
-   */
-  if (irq->on)
-    irq->on(irq);
-
-  rtems_interrupt_enable(level);
-
-  return 1;
-}
-
-/*
- * ------------------- RTEMS Single Irq Handler Mngt Routines ------------
- */
-
-int BSP_install_rtems_irq_handler  (const rtems_irq_connect_data* irq)
-{
-  rtems_interrupt_level  level;
-
-  if (!isValidInterrupt(irq->name)) {
-    printk("Invalid interrupt vector %d\n",irq->name);
-    return 0;
-  }
-  /*
-   * Check if default handler is actually connected. If not issue an error.
-   * You must first get the current handler via i386_get_current_idt_entry
-   * and then disconnect it using i386_delete_idt_entry.
-   * RATIONALE : to always have the same transition by forcing the user
-   * to get the previous handler before accepting to disconnect.
-   */
-  rtems_interrupt_disable(level);
-  if (rtems_hdl_tbl[irq->name].hdl != default_rtems_entry.hdl) {
-    rtems_interrupt_enable(level);
-    printk("IRQ vector %d already connected\n",irq->name);
-    return 0;
-  }
-
-  /*
-   * store the data provided by user
-   */
-  rtems_hdl_tbl[irq->name] = *irq;
-  rtems_hdl_tbl[irq->name].next_handler = (void *)-1;
-
-  /*
-   * enable_irq_at_pic is supposed to ignore
-   * requests to disable interrupts outside
-   * of the range handled by the PIC
-   */
-  BSP_enable_irq_at_pic(irq->name);
-
-  /*
-   * Enable interrupt on device
-   */
-  if (irq->on)
-    irq->on(irq);
-
-  rtems_interrupt_enable(level);
-
-  return 1;
-}
-
-int BSP_get_current_rtems_irq_handler  (rtems_irq_connect_data* irq)
-{
-  rtems_interrupt_level       level;
-
-  if (!isValidInterrupt(irq->name)) {
-    return 0;
-  }
-  rtems_interrupt_disable(level);
-  *irq = rtems_hdl_tbl[irq->name];
-  rtems_interrupt_enable(level);
-  return 1;
-}
-
-int BSP_remove_rtems_irq_handler  (const rtems_irq_connect_data* irq)
-{
-  rtems_irq_connect_data *pchain= NULL, *vchain = NULL;
-  rtems_interrupt_level   level;
-
-  if (!isValidInterrupt(irq->name)) {
-    return 0;
-  }
-  /*
-   * Check if default handler is actually connected. If not issue an error.
-   * You must first get the current handler via i386_get_current_idt_entry
-   * and then disconnect it using i386_delete_idt_entry.
-   * RATIONALE : to always have the same transition by forcing the user
-   * to get the previous handler before accepting to disconnect.
-   */
-  rtems_interrupt_disable(level);
-  if (rtems_hdl_tbl[irq->name].hdl != irq->hdl) {
-    rtems_interrupt_enable(level);
-    return 0;
-  }
-
-  if ( (int)rtems_hdl_tbl[irq->name].next_handler != -1 ) {
-    int found = 0;
-
-    for( (pchain= NULL, vchain = &rtems_hdl_tbl[irq->name]);
-         (vchain->hdl != default_rtems_entry.hdl);
-         (pchain= vchain,
-          vchain = (rtems_irq_connect_data*)vchain->next_handler) ) {
-      if ( vchain->hdl == irq->hdl ) {
-        found =  -1;
-        break;
-      }
-    }
-
-    if ( !found ) {
-      rtems_interrupt_enable(level);
-      return 0;
-    }
-  } else {
-    if (rtems_hdl_tbl[irq->name].hdl != irq->hdl) {
-      rtems_interrupt_enable(level);
-      return 0;
-    }
-  }
-
-  /*
-   * disable_irq_at_pic is supposed to ignore
-   * requests to disable interrupts outside
-   * of the range handled by the PIC
-   */
-  BSP_disable_irq_at_pic(irq->name);
-
-  /*
-   * Disable interrupt on device
-   */
-  if (irq->off)
-    irq->off(irq);
-
-  /*
-   * restore the default irq value
-   */
-  if( !vchain ) {
-     /* single handler vector... */
-     rtems_hdl_tbl[irq->name] = default_rtems_entry;
-  } else {
-    if ( pchain ) {
-       /* non-first handler being removed */
-       pchain->next_handler = vchain->next_handler;
-    } else {
-       /* first handler isn't malloc'ed, so just overwrite it.  Since
-        * the contents of vchain are being struct copied, vchain itself
-        * goes away
-        */
-       vchain = vchain->next_handler;
-       rtems_hdl_tbl[irq->name]= *vchain;
-    }
-    free(vchain);
-  }
-
-  rtems_interrupt_enable(level);
-
-  return 1;
-}
-
-/*
- * RTEMS Global Interrupt Handler Management Routines
- */
-
-int BSP_rtems_irq_mngt_set(rtems_irq_global_settings* config)
-{
-  int                           i;
-  rtems_interrupt_level         level;
-  rtems_irq_connect_data*       vchain;
-  rtems_raw_except_connect_data vectorDesc;
-
-  /*
-   * Store various code accelerators
-   */
-  internal_config     = config;
-  default_rtems_entry = config->defaultEntry;
-  rtems_hdl_tbl       = config->irqHdlTbl;
-
-  rtems_interrupt_disable(level);
-
-  if ( !BSP_setup_the_pic(config) ) {
-    printk("PIC setup failed; leaving IRQs OFF\n");
-    return 0;
-  }
-
-  for ( i = config->irqBase; i < config->irqBase + config->irqNb; i++ ) {
-    for( vchain = &rtems_hdl_tbl[i];
-         ((int)vchain != -1 && vchain->hdl != default_rtems_entry.hdl); 
-         vchain = (rtems_irq_connect_data*)vchain->next_handler ) {
-      if (vchain->on)
-        vchain->on(vchain);
-    }
-  }
-
-    rtems_interrupt_enable(level);
-
-  /*
-   * We must connect the raw irq handler for the two
-   * expected interrupt sources : decrementer and external interrupts.
-   */
-  vectorDesc.exceptIndex       =  ASM_DEC_VECTOR;
-  vectorDesc.hdl.vector        =  ASM_DEC_VECTOR;
-  vectorDesc.hdl.raw_hdl       =  decrementer_exception_vector_prolog_code;
-  vectorDesc.hdl.raw_hdl_size  = 
-       (unsigned) decrementer_exception_vector_prolog_code_size;
-  vectorDesc.on     =  0;
-  vectorDesc.off    =  0;
-  vectorDesc.isOn   =  0;
-  if (!ppc_set_exception (&vectorDesc)) {
-    BSP_panic("Unable to initialize RTEMS decrementer raw exception\n");
-  }
-
-  vectorDesc.exceptIndex       =  ASM_EXT_VECTOR;
-  vectorDesc.hdl.vector        =  ASM_EXT_VECTOR;
-  vectorDesc.hdl.raw_hdl       =  external_exception_vector_prolog_code;
-  vectorDesc.hdl.raw_hdl_size  =
-       (unsigned) external_exception_vector_prolog_code_size;
-  if (!ppc_set_exception (&vectorDesc)) {
-    BSP_panic("Unable to initialize RTEMS external raw exception\n");
-  }
-  return 1;
-}
-
-int BSP_rtems_irq_mngt_get(rtems_irq_global_settings** config)
-{
-  *config = internal_config;
-  return 0;
-}
-
-void _ThreadProcessSignalsFromIrq (BSP_Exception_frame* ctx)
-{
-  /*
-   * Process pending signals that have not already been
-   * processed by _Thread_Displatch. This happens quite
-   * unfrequently : the ISR must have posted an action
-   * to the current running thread.
-   */
-  if ( _Thread_Do_post_task_switch_extension ||
-       _Thread_Executing->do_post_task_switch_extension ) {
-    _Thread_Executing->do_post_task_switch_extension = false;
-    _API_extensions_Run_postswitch();
-  }
-  /*
-   * I plan to process other thread related events here.
-   * This will include DEBUG session requested from keyboard...
-   */
-}
diff --git a/c/src/lib/libbsp/powerpc/shared/irq/irq_asm.S b/c/src/lib/libbsp/powerpc/shared/irq/irq_asm.S
deleted file mode 100644
index 5541632c0f..0000000000
--- a/c/src/lib/libbsp/powerpc/shared/irq/irq_asm.S
+++ /dev/null
@@ -1,415 +0,0 @@
-/*
- *  This file contains the assembly code for the PowerPC
- *  IRQ veneers for RTEMS.
- *
- *  The license and distribution terms for this file may be
- *  found in found in the file LICENSE in this distribution or at
- *  http://www.rtems.com/license/LICENSE.
- *
- *  Modified to support the MCP750.
- *  Modifications Copyright (C) 1999 Eric Valette. valette@crf.canon.fr
- *
- *  Till Straumann <strauman@slac.stanford.edu>, 2003/7:
- *    - store isr nesting level in _ISR_Nest_level rather than
- *      SPRG0 - RTEMS relies on that variable.
- *  Till Straumann <strauman@slac.stanford.edu>, 2005/4:
- *    - DONT enable FP across ISR since fpregs are not saved!!
- *      FPU is used by Thread_Dispatch however...
- *
- * $Id$
- */
-
-#include <rtems/asm.h>
-#include <rtems/score/cpu.h>
-#include <bsp/vectors.h>
-#include <libcpu/raw_exception.h>
-
-#define MSR_EXC_BITS (MSR_DR | MSR_IR | MSR_RI)
-
-#define SYNC \
-	sync; \
-	isync
-
-	.text
-	.p2align 5
-#if defined(ASM_DEC_VECTOR)
-	PUBLIC_VAR(decrementer_exception_vector_prolog_code)
-
-SYM (decrementer_exception_vector_prolog_code):
-	/*
-	 * let room for exception frame
-	 */
-	stwu    r1, - (EXCEPTION_FRAME_END)(r1)
-	stw	r4, GPR4_OFFSET(r1)
-	li	r4, ASM_DEC_VECTOR
-	ba	shared_raw_irq_code_entry
-
-	PUBLIC_VAR (decrementer_exception_vector_prolog_code_size)
-
-	decrementer_exception_vector_prolog_code_size = . - decrementer_exception_vector_prolog_code
-#endif
-
-#if defined(ASM_60X_SYSMGMT_VECTOR)
-	PUBLIC_VAR(sysmgmt_exception_vector_prolog_code)
-
-SYM (sysmgmt_exception_vector_prolog_code):
-	/*
-	 * let room for exception frame
-	 */
-	stwu    r1, - (EXCEPTION_FRAME_END)(r1)
-	stw	r4, GPR4_OFFSET(r1)
-	li	r4, ASM_60X_SYSMGMT_VECTOR
-	ba	shared_raw_irq_code_entry
-
-	PUBLIC_VAR (sysmgmt_exception_vector_prolog_code_size)
-
-	sysmgmt_exception_vector_prolog_code_size = . - sysmgmt_exception_vector_prolog_code
-#endif
-
-
-#if defined(ASM_BOOKE_DEC_VECTOR)
-	PUBLIC_VAR(pit_exception_vector_prolog_code)
-
-SYM (pit_exception_vector_prolog_code):
-	/*
-	 * let room for exception frame
-	 */
-	stwu    r1, - (EXCEPTION_FRAME_END)(r1)
-	stw	r4, GPR4_OFFSET(r1)
-	li	r4, ASM_BOOKE_DEC_VECTOR
-	ba	shared_raw_irq_code_entry
-
-	PUBLIC_VAR (pit_exception_vector_prolog_code_size)
-
-	pit_exception_vector_prolog_code_size = . - pit_exception_vector_prolog_code
-#endif
-
-#if defined(ASM_BOOKE_FIT_VECTOR)
-	PUBLIC_VAR(fit_exception_vector_prolog_code)
-
-SYM (fit_exception_vector_prolog_code):
-	/*
-	 * let room for exception frame
-	 */
-	stwu    r1, - (EXCEPTION_FRAME_END)(r1)
-	stw	r4, GPR4_OFFSET(r1)
-	li	r4, ASM_BOOKE_FIT_VECTOR
-	ba	shared_raw_irq_code_entry
-
-	PUBLIC_VAR (fit_exception_vector_prolog_code_size)
-
-	fit_exception_vector_prolog_code_size = . - fit_exception_vector_prolog_code
-#endif
-	
-	PUBLIC_VAR(external_exception_vector_prolog_code)
-
-#if defined(ASM_EXT_VECTOR)
-SYM (external_exception_vector_prolog_code):
-	/*
-	 * let room for exception frame
-	 */
-	stwu    r1, - (EXCEPTION_FRAME_END)(r1)
-	stw	r4, GPR4_OFFSET(r1)
-	li	r4, ASM_EXT_VECTOR
-	ba	shared_raw_irq_code_entry
-
-	PUBLIC_VAR (external_exception_vector_prolog_code_size)
-
-	external_exception_vector_prolog_code_size = . - external_exception_vector_prolog_code
-#endif
-
-	PUBLIC_VAR(shared_raw_irq_code_entry)
-	PUBLIC_VAR(C_dispatch_irq_handler)
-
-	.p2align 5
-SYM (shared_raw_irq_code_entry):
-	/*
-	 * Entry conditions :
-	 *	Registers already saved : R1, R4
-	 *	R1  :	points to a location with enough room for the
-	 *	        interrupt frame
-	 *	R4  :	vector number
-	 */
-	/*
-	 * Save SRR0/SRR1 As soon As possible as it is the minimal needed
-	 * to reenable exception processing
-	 */
-	stw	r0, GPR0_OFFSET(r1)
-	/* PPC EABI: R2 is reserved (pointer to short data .sdata2) - we won't touch it
-	 * but we still save/restore it, just in case...
-	 */
-	stw	r2, GPR2_OFFSET(r1)
-	stw	r3, GPR3_OFFSET(r1)
-
-	mfsrr0  r0
-	mfsrr1  r3
-
-	stw	r0, SRR0_FRAME_OFFSET(r1)
-	stw	r3, SRR1_FRAME_OFFSET(r1)
-
-	/*
-	 * Enable data and instruction address translation, exception recovery
-	 * by merging original bits from saved SRR1.
-	 */
-	li      r0, MSR_EXC_BITS
-	and     r0, r0, r3
-	mfmsr	r3
-	or      r3, r3, r0
-	mtmsr   r3
-	SYNC
-	/*
-	 * Push C scratch registers on the current stack. It may
-	 * actually be the thread stack or the interrupt stack.
-	 * Anyway we have to make it in order to be able to call C/C++
-	 * functions. Depending on the nesting interrupt level, we will
-	 * switch to the right stack later.
-	 */
-	stw	r5, GPR5_OFFSET(r1)
-	stw	r6, GPR6_OFFSET(r1)
-	stw	r7, GPR7_OFFSET(r1)
-	stw	r8, GPR8_OFFSET(r1)
-	stw	r9, GPR9_OFFSET(r1)
-	stw	r10, GPR10_OFFSET(r1)
-	stw	r11, GPR11_OFFSET(r1)
-	stw	r12, GPR12_OFFSET(r1)
-	stw	r13, GPR13_OFFSET(r1)
-
-	mfcr	r5
-	mfctr	r6
-	mfxer	r7
-	mflr	r8
-
-	stw	r5,  EXC_CR_OFFSET(r1)
-	stw	r6,  EXC_CTR_OFFSET(r1)
-	stw	r7,  EXC_XER_OFFSET(r1)
-	stw	r8,  EXC_LR_OFFSET(r1)
-
-	/*
-	 * Add some non volatile registers to store information
-	 * that will be used when returning from C handler
-	 */
-	stw	r14, GPR14_OFFSET(r1)
-	stw	r15, GPR15_OFFSET(r1)
-	/*
-	 * save current stack pointer location in R14
-	 */
-	addi	r14, r1, 0
-	/*
-	 * store part of _Thread_Dispatch_disable_level address in R15
-	 */
-	addis r15,0, _Thread_Dispatch_disable_level@ha
-#if BROKEN_ISR_NEST_LEVEL
-	/*
-	 * Get current nesting level in R3
-	 */
-	mfspr	r3, SPRG0
-#else
-	/*
-	 * Retrieve current nesting level from _ISR_Nest_level
-	 */
-	lis		r7, _ISR_Nest_level@ha
-	lwz		r3, _ISR_Nest_level@l(r7)
-#endif
-	/*
-	 * Check if stack switch is necessary
-	 */
-	cmpwi	r3,0
-	bne	nested
-	mfspr	r1, SPRG1
-
-nested:
-	/*
-	 * Start Incrementing nesting level in R3
-	 */
-	addi	r3,r3,1
-	/*
-	 * Start Incrementing _Thread_Dispatch_disable_level R4 = _Thread_Dispatch_disable_level
-	 */
-	lwz	r6,_Thread_Dispatch_disable_level@l(r15)
-#if BROKEN_ISR_NEST_LEVEL
-	/*
-	 * Store new nesting level in SPRG0
-	 */
-	mtspr	SPRG0, r3
-#else
-	/* store new nesting level in _ISR_Nest_level */
-	stw		r3, _ISR_Nest_level@l(r7)
-#endif
-
-	addi	r6, r6, 1
-	mfmsr	r5
-	/*
-	 * store new _Thread_Dispatch_disable_level value
-	 */
-	stw	r6, _Thread_Dispatch_disable_level@l(r15)
-	/*
-	 * We are now running on the interrupt stack. External and decrementer
-	 * exceptions are still disabled. I see no purpose trying to optimize
-	 * further assembler code.
-	 */
-	/*
-	 * Call C exception handler for decrementer Interrupt frame is passed just
-	 * in case...
-	 */
-	addi	r3, r14, 0x8
-	/* clear CR[6] to make sure no varargs fn callee assumes there are FP args passed */
-	crxor	6,6,6
-	bl	C_dispatch_irq_handler /* C_dispatch_irq_handler(cpu_interrupt_frame* r3, vector r4) */
-	/*
-	 * start decrementing nesting level. Note : do not test result against 0
-	 * value as an easy exit condition because if interrupt nesting level > 1
-	 * then _Thread_Dispatch_disable_level > 1
-	 */
-#if BROKEN_ISR_NEST_LEVEL
-	mfspr	r4, SPRG0
-#else
-	lis		r7, _ISR_Nest_level@ha
-	lwz		r4, _ISR_Nest_level@l(r7)
-#endif
-	/*
-	 * start decrementing _Thread_Dispatch_disable_level
-	 */
-	lwz	r3,_Thread_Dispatch_disable_level@l(r15)
-	addi	r4, r4, -1	/* Continue decrementing nesting level */
-	addi	r3, r3, -1	/* Continue decrementing _Thread_Dispatch_disable_level */
-#if BROKEN_ISR_NEST_LEVEL
-	mtspr	SPRG0, r4	/* End decrementing nesting level */
-#else
-	stw		r4, _ISR_Nest_level@l(r7) /* End decrementing nesting level */
-#endif
-	stw	r3,_Thread_Dispatch_disable_level@l(r15) /* End decrementing _Thread_Dispatch_disable_level */
-	cmpwi	r3, 0
-	/*
-	 * switch back to original stack (done here just optimize registers
-	 * contention. Could have been done before...)
-	 */
-	addi	r1, r14, 0
-	bne	easy_exit /* if (_Thread_Dispatch_disable_level != 0) goto easy_exit */
-	/*
-	 * Here we are running again on the thread system stack.
-	 * We have interrupt nesting level = _Thread_Dispatch_disable_level = 0.
-	 * Interrupt are still disabled. Time to check if scheduler request to
-	 * do something with the current thread...
-	 */
-	addis	r4, 0, _Context_Switch_necessary@ha
-	lbz	r5, _Context_Switch_necessary@l(r4)
-	cmpwi	r5, 0
-	bne	switch
-
-	addis	r6, 0, _ISR_Signals_to_thread_executing@ha
-	lbz	r7, _ISR_Signals_to_thread_executing@l(r6)
-	cmpwi	r7, 0
-	li	r8, 0
-	beq	easy_exit
-	stb	r8, _ISR_Signals_to_thread_executing@l(r6)
-	/*
-	 * going to call _ThreadProcessSignalsFromIrq
-	 * Push a complete exception like frame...
-	 */
-	stmw	r16, GPR16_OFFSET(r1)
-	addi	r3, r1, 0x8
-	/*
-	 * compute SP at exception entry
-	 */
-	addi    r4, r1, EXCEPTION_FRAME_END
-	/*
-	 * store it at the right place
-	 */
-	stw     r4, GPR1_OFFSET(r1)
-	/*
-	 * Call High Level signal handling code
-	 */
-	bl	_ThreadProcessSignalsFromIrq
-	/*
-	 * start restoring exception like frame
-	 */
-	lwz	r31,  EXC_CTR_OFFSET(r1)
-	lwz	r30,  EXC_XER_OFFSET(r1)
-	lwz	r29,  EXC_CR_OFFSET(r1)
-	lwz	r28,  EXC_LR_OFFSET(r1)
-
-	mtctr	r31
-	mtxer	r30
-	mtcr	r29
-	mtlr	r28
-
-	lmw	r4, GPR4_OFFSET(r1)
-	lwz	r2, GPR2_OFFSET(r1)
-	lwz	r0, GPR0_OFFSET(r1)
-
-	/*
-	 * Disable data and instruction translation. Make path non recoverable...
-	 */
-	li      r0, MSR_EXC_BITS
-	mfmsr	r3
-	andc	r3, r3, r0
-	mtmsr   r3
-	SYNC
-	/*
-	 * Restore rfi related settings
-	 */
-
-	lwz	r3, SRR1_FRAME_OFFSET(r1)
-	mtsrr1	r3
-	lwz	r3, SRR0_FRAME_OFFSET(r1)
-	mtsrr0	r3
-
-	lwz	r3, GPR3_OFFSET(r1)
-	addi 	r1,r1, EXCEPTION_FRAME_END
-	SYNC
-	rfi
-
-switch:
-	bl	SYM (_Thread_Dispatch)
-
-easy_exit:
-	/*
-	 * start restoring interrupt frame
-	 */
-	lwz	r3,  EXC_CTR_OFFSET(r1)
-	lwz	r4,  EXC_XER_OFFSET(r1)
-	lwz	r5,  EXC_CR_OFFSET(r1)
-	lwz	r6,  EXC_LR_OFFSET(r1)
-
-	mtctr	r3
-	mtxer	r4
-	mtcr	r5
-	mtlr	r6
-
-	lwz	r15, GPR15_OFFSET(r1)
-	lwz	r14, GPR14_OFFSET(r1)
-	lwz	r13, GPR13_OFFSET(r1)
-	lwz	r12, GPR12_OFFSET(r1)
-	lwz	r11, GPR11_OFFSET(r1)
-	lwz	r10, GPR10_OFFSET(r1)
-	lwz	r9, GPR9_OFFSET(r1)
-	lwz	r8, GPR8_OFFSET(r1)
-	lwz	r7, GPR7_OFFSET(r1)
-	lwz	r6, GPR6_OFFSET(r1)
-	lwz	r5, GPR5_OFFSET(r1)
-
-	/*
-	 * Disable nested exception processing, data and instruction
-	 * translation.
-	 */
-	li      r0, MSR_EXC_BITS
-	mfmsr	r3
-	andc	r3, r3, r0
-	mtmsr   r3
-	SYNC
-	/*
-	 * Restore rfi related settings
-	 */
-
-	lwz	r4, SRR1_FRAME_OFFSET(r1)
-	lwz	r3, SRR0_FRAME_OFFSET(r1)
-	lwz	r2, GPR2_OFFSET(r1)
-	lwz	r0, GPR0_OFFSET(r1)
-
-	mtsrr1	r4
-	mtsrr0	r3
-	lwz	r4, GPR4_OFFSET(r1)
-	lwz	r3, GPR3_OFFSET(r1)
-	addi 	r1,r1, EXCEPTION_FRAME_END
-	SYNC
-	rfi