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<title>change log for rtems (2010-05-13)</title>
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<table border='0' cellspacing='0' cellpadding='5' width='100%' bgcolor='#eeeeee'>
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<font color='#bb2222'><strong>joel</strong></font>
</td></tr>
<tr><td colspan='3' bgcolor='#dddddd'><pre>2010-05-13 Joel Sherrill <joel.sherrill@oarcorp.com>
* startup/exception.S: Minor changes to make more similar to the shared
version.
</pre></td></tr>
<tr><td width='1%'><a href="http://www.rtems.com/cgi-bin/viewcvs.cgi//rtems/c/src/lib/libbsp/mips/hurricane/ChangeLog.diff?r1=text&tr1=1.49&r2=text&tr2=1.50&diff_format=h">M</a></td><td width='1%'>1.50</td><td width='100%'>c/src/lib/libbsp/mips/hurricane/ChangeLog</td></tr>
<tr><td width='1%'><a href="http://www.rtems.com/cgi-bin/viewcvs.cgi//rtems/c/src/lib/libbsp/mips/hurricane/startup/exception.S.diff?r1=text&tr1=1.4&r2=text&tr2=1.5&diff_format=h">M</a></td><td width='1%'>1.5</td><td width='100%'>c/src/lib/libbsp/mips/hurricane/startup/exception.S</td></tr>
</table>
<pre>
<font color='#006600'>diff -u rtems/c/src/lib/libbsp/mips/hurricane/ChangeLog:1.49 rtems/c/src/lib/libbsp/mips/hurricane/ChangeLog:1.50
--- rtems/c/src/lib/libbsp/mips/hurricane/ChangeLog:1.49 Tue Apr 27 12:11:00 2010
+++ rtems/c/src/lib/libbsp/mips/hurricane/ChangeLog Thu May 13 13:08:11 2010
</font><font color='#997700'>@@ -1,3 +1,8 @@
</font><font color='#000088'>+2010-05-13 Joel Sherrill <joel.sherrill@oarcorp.com>
+
+ * startup/exception.S: Minor changes to make more similar to the shared
+ version.
+
</font> 2010-04-27 Joel Sherrill <joel.sherrill@oarcorp.com>
* startup/linkcmds: Revert previous change. Remove .reginfo from .bss
<font color='#006600'>diff -u rtems/c/src/lib/libbsp/mips/hurricane/startup/exception.S:1.4 rtems/c/src/lib/libbsp/mips/hurricane/startup/exception.S:1.5
--- rtems/c/src/lib/libbsp/mips/hurricane/startup/exception.S:1.4 Sun Nov 29 09:27:06 2009
+++ rtems/c/src/lib/libbsp/mips/hurricane/startup/exception.S Thu May 13 13:08:11 2010
</font><font color='#997700'>@@ -135,7 +135,7 @@
</font> *
*/
#endif
<font color='#880000'>-FRAME(hurricane_ISR_Handler,sp,0,ra)
</font><font color='#000088'>+FRAME(bsp_ISR_Handler,sp,0,ra)
</font> .set noreorder
mfc0 k0,C0_CAUSE /* Determine if an interrupt generated this exception */
<font color='#997700'>@@ -143,7 +143,7 @@
</font> and k1,k0,CAUSE_EXCMASK
beq k1,zero,_chk_int /* If so, branch to service here */
nop
<font color='#880000'>-1: la k0,_int_esr_link /* Otherwise, jump to next exception handler in PMON exception chain */
</font><font color='#000088'>+ la k0,_int_esr_link /* Otherwise, jump to next exception handler in PMON exception chain */
</font> lw k0,(k0)
lw k0,4(k0)
j k0
<font color='#997700'>@@ -438,7 +438,7 @@
</font>
.set reorder
<font color='#880000'>-ENDFRAME(hurricane_ISR_Handler)
</font><font color='#000088'>+ENDFRAME(bsp_ISR_Handler)
</font>
FRAME(_BRK_Handler,sp,0,ra)
<font color='#997700'>@@ -675,7 +675,7 @@
</font> .global _int_esr_link
_int_esr_link:
.word 0
<font color='#880000'>- .word hurricane_ISR_Handler
</font><font color='#000088'>+ .word bsp_ISR_Handler
</font>
/* Break exception service routine link */
.global _brk_esr_link
</pre>
<p> </p>
<a name='cs2'></a>
<table border='0' cellspacing='0' cellpadding='5' width='100%' bgcolor='#eeeeee'>
<tr><td colspan='3' bgcolor='#dddddd'>
<font color='#bb2222'><strong>joel</strong></font>
</td></tr>
<tr><td colspan='3' bgcolor='#dddddd'><pre>2010-05-13 Joel Sherrill <joel.sherrill@oarcorp.com>
* Makefile.am: rbtx4925 and rbtx4938 had copies of the same file with
only minor differences. Both now use shared/irq/exception.S
* startup/exception.S: Removed.
</pre></td></tr>
<tr><td width='1%'><a href="http://www.rtems.com/cgi-bin/viewcvs.cgi//rtems/c/src/lib/libbsp/mips/rbtx4925/ChangeLog.diff?r1=text&tr1=1.45&r2=text&tr2=1.46&diff_format=h">M</a></td><td width='1%'>1.46</td><td width='100%'>c/src/lib/libbsp/mips/rbtx4925/ChangeLog</td></tr>
<tr><td width='1%'><a href="http://www.rtems.com/cgi-bin/viewcvs.cgi//rtems/c/src/lib/libbsp/mips/rbtx4925/Makefile.am.diff?r1=text&tr1=1.15&r2=text&tr2=1.16&diff_format=h">M</a></td><td width='1%'>1.16</td><td width='100%'>c/src/lib/libbsp/mips/rbtx4925/Makefile.am</td></tr>
<tr><td width='1%'><a href="http://www.rtems.com/cgi-bin/viewcvs.cgi//rtems/c/src/lib/libbsp/mips/rbtx4925/startup/exception.S?rev=1.4&content-type=text/vnd.viewcvs-markup">R</a></td><td width='1%'><font color="#880000">1.4</font></td><td width='100%'><font color="#880000">c/src/lib/libbsp/mips/rbtx4925/startup/exception.S</font></td></tr>
<tr><td width='1%'><a href="http://www.rtems.com/cgi-bin/viewcvs.cgi//rtems/c/src/lib/libbsp/mips/rbtx4938/ChangeLog.diff?r1=text&tr1=1.46&r2=text&tr2=1.47&diff_format=h">M</a></td><td width='1%'>1.47</td><td width='100%'>c/src/lib/libbsp/mips/rbtx4938/ChangeLog</td></tr>
<tr><td width='1%'><a href="http://www.rtems.com/cgi-bin/viewcvs.cgi//rtems/c/src/lib/libbsp/mips/rbtx4938/Makefile.am.diff?r1=text&tr1=1.15&r2=text&tr2=1.16&diff_format=h">M</a></td><td width='1%'>1.16</td><td width='100%'>c/src/lib/libbsp/mips/rbtx4938/Makefile.am</td></tr>
<tr><td width='1%'><a href="http://www.rtems.com/cgi-bin/viewcvs.cgi//rtems/c/src/lib/libbsp/mips/rbtx4938/startup/exception.S?rev=1.4&content-type=text/vnd.viewcvs-markup">R</a></td><td width='1%'><font color="#880000">1.4</font></td><td width='100%'><font color="#880000">c/src/lib/libbsp/mips/rbtx4938/startup/exception.S</font></td></tr>
</table>
<pre>
<font color='#006600'>diff -u rtems/c/src/lib/libbsp/mips/rbtx4925/ChangeLog:1.45 rtems/c/src/lib/libbsp/mips/rbtx4925/ChangeLog:1.46
--- rtems/c/src/lib/libbsp/mips/rbtx4925/ChangeLog:1.45 Tue Apr 27 12:11:06 2010
+++ rtems/c/src/lib/libbsp/mips/rbtx4925/ChangeLog Thu May 13 13:08:33 2010
</font><font color='#997700'>@@ -1,3 +1,9 @@
</font><font color='#000088'>+2010-05-13 Joel Sherrill <joel.sherrill@oarcorp.com>
+
+ * Makefile.am: rbtx4925 and rbtx4938 had copies of the same file with
+ only minor differences. Both now use shared/irq/exception.S
+ * startup/exception.S: Removed.
+
</font> 2010-04-27 Joel Sherrill <joel.sherrill@oarcorp.com>
* startup/linkcmds: Revert previous change. Remove .reginfo from .bss
<font color='#006600'>diff -u rtems/c/src/lib/libbsp/mips/rbtx4925/Makefile.am:1.15 rtems/c/src/lib/libbsp/mips/rbtx4925/Makefile.am:1.16
--- rtems/c/src/lib/libbsp/mips/rbtx4925/Makefile.am:1.15 Thu Oct 2 16:38:27 2008
+++ rtems/c/src/lib/libbsp/mips/rbtx4925/Makefile.am Thu May 13 13:08:33 2010
</font><font color='#997700'>@@ -37,7 +37,7 @@
</font> ../../shared/bootcard.c ../../shared/sbrk.c \
../../shared/gnatinstallhandler.c ../../shared/setvec.c \
startup/inittlb.c \
<font color='#880000'>- startup/idtmem.S startup/idttlb.S startup/exception.S
</font><font color='#000088'>+ startup/idtmem.S startup/idttlb.S ../shared/irq/exception.S
</font>
# clock
noinst_PROGRAMS += clock.rel
<font color='#006600'>diff -u rtems/c/src/lib/libbsp/mips/rbtx4938/ChangeLog:1.46 rtems/c/src/lib/libbsp/mips/rbtx4938/ChangeLog:1.47
--- rtems/c/src/lib/libbsp/mips/rbtx4938/ChangeLog:1.46 Tue Apr 27 12:11:10 2010
+++ rtems/c/src/lib/libbsp/mips/rbtx4938/ChangeLog Thu May 13 13:08:36 2010
</font><font color='#997700'>@@ -1,3 +1,9 @@
</font><font color='#000088'>+2010-05-13 Joel Sherrill <joel.sherrill@oarcorp.com>
+
+ * Makefile.am: rbtx4925 and rbtx4938 had copies of the same file with
+ only minor differences. Both now use shared/irq/exception.S
+ * startup/exception.S: Removed.
+
</font> 2010-04-27 Joel Sherrill <joel.sherrill@oarcorp.com>
* startup/linkcmds: Revert previous change. Remove .reginfo from .bss
<font color='#006600'>diff -u rtems/c/src/lib/libbsp/mips/rbtx4938/Makefile.am:1.15 rtems/c/src/lib/libbsp/mips/rbtx4938/Makefile.am:1.16
--- rtems/c/src/lib/libbsp/mips/rbtx4938/Makefile.am:1.15 Thu Oct 2 16:38:28 2008
+++ rtems/c/src/lib/libbsp/mips/rbtx4938/Makefile.am Thu May 13 13:08:36 2010
</font><font color='#997700'>@@ -37,7 +37,7 @@
</font> ../../shared/bootcard.c ../../shared/sbrk.c \
../../shared/gnatinstallhandler.c ../../shared/setvec.c \
startup/inittlb.c \
<font color='#880000'>- startup/idtmem.S startup/idttlb.S startup/exception.S
</font><font color='#000088'>+ startup/idtmem.S startup/idttlb.S ../shared/irq/exception.S
</font>
# clock
noinst_PROGRAMS += clock.rel
</pre>
<p> </p>
<a name='cs3'></a>
<table border='0' cellspacing='0' cellpadding='5' width='100%' bgcolor='#eeeeee'>
<tr><td colspan='3' bgcolor='#dddddd'>
<font color='#bb2222'><strong>joel</strong></font>
</td></tr>
<tr><td colspan='3' bgcolor='#dddddd'><pre>2010-05-13 Joel Sherrill <joel.sherrill@oarcorp.com>
* shared/irq/exception.S: New file.
</pre></td></tr>
<tr><td width='1%'><a href="http://www.rtems.com/cgi-bin/viewcvs.cgi//rtems/c/src/lib/libbsp/mips/ChangeLog.diff?r1=text&tr1=1.34&r2=text&tr2=1.35&diff_format=h">M</a></td><td width='1%'>1.35</td><td width='100%'>c/src/lib/libbsp/mips/ChangeLog</td></tr>
<tr><td width='1%'><a href="http://www.rtems.com/cgi-bin/viewcvs.cgi//rtems/c/src/lib/libbsp/mips/shared/irq/exception.S?rev=1.1&content-type=text/vnd.viewcvs-markup">A</a></td><td width='1%'><font color="#000088">1.1</font></td><td width='100%'><font color="#000088">c/src/lib/libbsp/mips/shared/irq/exception.S</font></td></tr>
</table>
<pre>
<font color='#006600'>diff -u rtems/c/src/lib/libbsp/mips/ChangeLog:1.34 rtems/c/src/lib/libbsp/mips/ChangeLog:1.35
--- rtems/c/src/lib/libbsp/mips/ChangeLog:1.34 Wed Apr 28 13:59:49 2010
+++ rtems/c/src/lib/libbsp/mips/ChangeLog Thu May 13 13:08:38 2010
</font><font color='#997700'>@@ -1,3 +1,7 @@
</font><font color='#000088'>+2010-05-13 Joel Sherrill <joel.sherrill@oarcorp.com>
+
+ * shared/irq/exception.S: New file.
+
</font> 2010-04-28 Joel Sherrill <joel.sherrilL@OARcorp.com>
* shared/gdbstub/mips-stub.c: Remove warnings.
<font color='#006600'>diff -u /dev/null rtems/c/src/lib/libbsp/mips/shared/irq/exception.S:1.1
--- /dev/null Thu May 13 13:11:52 2010
+++ rtems/c/src/lib/libbsp/mips/shared/irq/exception.S Thu May 13 13:08:38 2010
</font><font color='#997700'>@@ -0,0 +1,641 @@
</font><font color='#000088'>+/* exception.S
+ *
+ * This file contains a customized MIPS exception handler.
+ * It hooks into the exception handler present in the resident
+ * PMON debug monitor.
+ *
+ * Author: Bruce Robinson
+ *
+ * This code was derived from cpu_asm.S with the following copyright:
+ *
+ * COPYRIGHT (c) 1996 by Transition Networks Inc.
+ *
+ * To anyone who acknowledges that this file is provided "AS IS"
+ * without any express or implied warranty:
+ * permission to use, copy, modify, and distribute this file
+ * for any purpose is hereby granted without fee, provided that
+ * the above copyright notice and this notice appears in all
+ * copies, and that the name of Transition Networks not be used in
+ * advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.
+ * Transition Networks makes no representations about the suitability
+ * of this software for any purpose.
+ *
+ * Derived from c/src/exec/score/cpu/no_cpu/cpu_asm.s:
+ *
+ * COPYRIGHT (c) 1989-1999.
+ * On-Line Applications Research Corporation (OAR).
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ *
+ * $Id$
+ */
+/* @(#)exception.S 7/27/04 1.00 */
+
+#include <rtems/mips/iregdef.h>
+#include <rtems/mips/idtcpu.h>
+
+
+#define FRAME(name,frm_reg,offset,ret_reg) \
+ .globl name; \
+ .ent name; \
+name:; \
+ .frame frm_reg,offset,ret_reg
+#define ENDFRAME(name) \
+ .end name
+
+
+#if __mips == 3
+/* 64 bit register operations */
+#define NOP nop
+#define ADD dadd
+#define STREG sd
+#define LDREG ld
+#define ADDU addu
+#define ADDIU addiu
+#define STREGC1 sdc1
+#define LDREGC1 ldc1
+#define R_SZ 8
+#define F_SZ 8
+#define SZ_INT 8
+#define SZ_INT_POW2 3
+
+/* XXX if we don't always want 64 bit register ops, then another ifdef */
+
+#elif __mips == 1
+/* 32 bit register operations*/
+#define NOP nop
+#define ADD add
+#define STREG sw
+#define LDREG lw
+#define ADDU add
+#define ADDIU addi
+#define STREGC1 swc1
+#define LDREGC1 lwc1
+#define R_SZ 4
+#define F_SZ 4
+#define SZ_INT 4
+#define SZ_INT_POW2 2
+#else
+#error "mips assembly: what size registers do I deal with?"
+#endif
+
+
+#define ISR_VEC_SIZE 4
+#define EXCP_STACK_SIZE (NREGS*R_SZ)
+
+
+#ifdef __GNUC__
+#define EXTERN(x,size) .extern x,size
+#else
+#define EXTERN(x,size)
+#endif
+
+
+EXTERN(_ISR_Nest_level, 4)
+EXTERN(_Thread_Dispatch_disable_level,4)
+EXTERN(_Context_Switch_necessary,1)
+EXTERN(_ISR_Signals_to_thread_executing,1)
+.extern _Thread_Dispatch
+.extern _ISR_Vector_table
+
+/* void __ISR_Handler()
+ *
+ * This routine provides the RTEMS interrupt management.
+ *
+ */
+
+#if 0
+void _ISR_Handler()
+{
+ /*
+ * This discussion ignores a lot of the ugly details in a real
+ * implementation such as saving enough registers/state to be
+ * able to do something real. Keep in mind that the goal is
+ * to invoke a user's ISR handler which is written in C and
+ * uses a certain set of registers.
+ *
+ * Also note that the exact order is to a large extent flexible.
+ * Hardware will dictate a sequence for a certain subset of
+ * _ISR_Handler while requirements for setting
+ */
+
+ /*
+ * At entry to "common" _ISR_Handler, the vector number must be
+ * available. On some CPUs the hardware puts either the vector
+ * number or the offset into the vector table for this ISR in a
+ * known place. If the hardware does not give us this information,
+ * then the assembly portion of RTEMS for this port will contain
+ * a set of distinct interrupt entry points which somehow place
+ * the vector number in a known place (which is safe if another
+ * interrupt nests this one) and branches to _ISR_Handler.
+ *
+ */
+#endif
+FRAME(bsp_ISR_Handler,sp,0,ra)
+ .set noreorder
+
+#if 0
+/* Activate TX49xx PIO19 signal for diagnostics */
+ lui k0,0xff1f
+ ori k0,k0,0xf500
+ lw k0,(k0)
+ lui k1,0x8
+ or k1,k1,k0
+ lui k0,0xff1f
+ ori k0,k0,0xf500
+ sw k1,(k0)
+#endif
+
+ mfc0 k0,C0_CAUSE /* Determine if an interrupt generated this exception */
+ nop
+ and k1,k0,CAUSE_EXCMASK
+ beq k1,zero,_chk_int /* If so, branch to service here */
+ nop
+ la k0,_int_esr_link /* Otherwise, jump to next exception handler in PMON exception chain */
+ lw k0,(k0)
+ lw k0,4(k0)
+ j k0
+ nop
+_chk_int:
+ mfc0 k1,C0_SR
+ nop
+ and k0,k1
+ and k0,(SR_IBIT1 | SR_IBIT2 | SR_IBIT3)
+ beq k0,zero,_ISR_Handler_quick_exit /* external interrupt not enabled, ignore */
+ nop
+
+/* For debugging interrupts, clear EXL to allow breakpoints */
+#if 0
+ MFC0 k0, C0_SR
+#if __mips == 3
+ li k1,SR_EXL /* Clear EXL and Set IE to enable interrupts */
+ not k1
+ and k0,k1
+ li k1,SR_IE
+#elif __mips == 1
+ li k1,SR_IEC
+#endif
+ or k0, k1
+ mtc0 k0, C0_SR
+ NOP
+#endif
+
+
+ /*
+ * save some or all context on stack
+ * may need to save some special interrupt information for exit
+ */
+
+ /* Q: _ISR_Handler, not using IDT/SIM ...save extra regs? */
+
+ /* wastes a lot of stack space for context?? */
+ ADDIU sp,sp,-EXCP_STACK_SIZE
+
+ STREG ra, R_RA*R_SZ(sp) /* store ra on the stack */
+ STREG v0, R_V0*R_SZ(sp)
+ STREG v1, R_V1*R_SZ(sp)
+ STREG a0, R_A0*R_SZ(sp)
+ STREG a1, R_A1*R_SZ(sp)
+ STREG a2, R_A2*R_SZ(sp)
+ STREG a3, R_A3*R_SZ(sp)
+ STREG t0, R_T0*R_SZ(sp)
+ STREG t1, R_T1*R_SZ(sp)
+ STREG t2, R_T2*R_SZ(sp)
+ STREG t3, R_T3*R_SZ(sp)
+ STREG t4, R_T4*R_SZ(sp)
+ STREG t5, R_T5*R_SZ(sp)
+ STREG t6, R_T6*R_SZ(sp)
+ STREG t7, R_T7*R_SZ(sp)
+ mflo t0
+ STREG t8, R_T8*R_SZ(sp)
+ STREG t0, R_MDLO*R_SZ(sp)
+ STREG t9, R_T9*R_SZ(sp)
+ mfhi t0
+ STREG gp, R_GP*R_SZ(sp)
+ STREG t0, R_MDHI*R_SZ(sp)
+ STREG fp, R_FP*R_SZ(sp)
+
+ .set noat
+ STREG AT, R_AT*R_SZ(sp)
+ .set at
+
+ mfc0 t0,C0_SR
+ dmfc0 t1,C0_EPC
+ STREG t0,R_SR*R_SZ(sp)
+ STREG t1,R_EPC*R_SZ(sp)
+
+ /*
+ *
+ * #if ( CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE )
+ * if ( _ISR_Nest_level == 0 )
+ * switch to software interrupt stack
+ * #endif
+ */
+
+ /*
+ * _ISR_Nest_level++;
+ */
+ lw t0,_ISR_Nest_level
+ NOP
+ add t0,t0,1
+ sw t0,_ISR_Nest_level
+ /*
+ * _Thread_Dispatch_disable_level++;
+ */
+ lw t1,_Thread_Dispatch_disable_level
+ NOP
+ add t1,t1,1
+ sw t1,_Thread_Dispatch_disable_level
+
+
+ /* DEBUG - Add the following code to disable interrupts and clear EXL in status register, this will
+ allow memory exceptions to occur while servicing the current interrupt */
+#if 0
+ li t0,~CAUSE_IP2_MASK /* Disable interrupts from internal interrupt controller */
+ mfc0 t1,C0_SR
+ nop
+ and t1,t0
+ mtc0 t1,C0_SR
+ nop
+ li t0,~SR_EXL /* Clear EXL in status register to allow memory exceptions to occur */
+ mfc0 t1,C0_SR
+ nop
+ and t1,t0
+ mtc0 t1,C0_SR
+ nop
+#endif
+
+ /*
+ * Call the CPU model or BSP specific routine to decode the
+ * interrupt source and actually vector to device ISR handlers.
+ */
+ move a0,sp
+ jal mips_vector_isr_handlers
+ NOP
+
+ /* Add the following code to disable interrupts (see DEBUG above) */
+#if 0
+ li t0,SR_EXL /* Set EXL to hold off interrupts */
+ mfc0 t1,C0_SR
+ nop
+ or t1,t0
+ mtc0 t1,C0_SR
+ nop
+ li t0,CAUSE_IP2_MASK /* Enable interrupts from internal interrupt controller */
+ mfc0 t1,C0_SR
+ nop
+ or t1,t0
+ mtc0 t1,C0_SR
+ nop
+#endif
+
+_ISR_Handler_cleanup:
+
+ /*
+ * --_ISR_Nest_level;
+ */
+ lw t2,_ISR_Nest_level
+ NOP
+ add t2,t2,-1
+ sw t2,_ISR_Nest_level
+ /*
+ * --_Thread_Dispatch_disable_level;
+ */
+ lw t1,_Thread_Dispatch_disable_level
+ NOP
+ add t1,t1,-1
+ sw t1,_Thread_Dispatch_disable_level
+ /*
+ * if ( _Thread_Dispatch_disable_level || _ISR_Nest_level )
+ * goto the label "exit interrupt (simple case)"
+ */
+ or t0,t2,t1
+ bne t0,zero,_ISR_Handler_exit
+ NOP
+
+
+ /*
+ * #if ( CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE )
+ * restore stack
+ * #endif
+ *
+ * if ( !_Context_Switch_necessary && !_ISR_Signals_to_thread_executing )
+ * goto the label "exit interrupt (simple case)"
+ */
+ lb t0,_Context_Switch_necessary
+ lb t1,_ISR_Signals_to_thread_executing
+ NOP
+ or<span style="background-color: #FF0000"> </span> t0,t0,t1
+ beq t0,zero,_ISR_Handler_exit
+ NOP
+
+/*
+** Turn on interrupts before entering Thread_Dispatch which
+** will run for a while, thus allowing new interrupts to
+** be serviced. Observe the Thread_Dispatch_disable_level interlock
+** that prevents recursive entry into Thread_Dispatch.
+*/
+
+ mfc0 t0, C0_SR
+#if __mips == 3
+ li t1,SR_EXL /* Clear EXL and Set IE to enable interrupts */
+ not t1
+ and t0,t1
+ li t1,SR_IE
+#elif __mips == 1
+ li t1,SR_IEC
+#endif
+ or t0, t1
+ mtc0 t0, C0_SR
+ NOP
+
+ /* save off our stack frame so the context switcher can get to it */
+ la t0,__exceptionStackFrame
+ STREG sp,(t0)
+
+ jal _Thread_Dispatch
+ NOP
+
+ /* and make sure its clear in case we didn't dispatch. if we did, its
+ ** already cleared */
+ la t0,__exceptionStackFrame
+ STREG zero,(t0)
+ NOP
+
+/*
+** turn interrupts back off while we restore context so
+** a badly timed interrupt won't accidentally mess things up
+*/
+ mfc0 t0, C0_SR
+#if __mips == 3
+ li t1,SR_IE /* Clear IE first (recommended) */
+ not t1
+ and t0,t1
+ mtc0 t0, C0_SR
+ li t1,SR_EXL | SR_IE /* Set EXL and IE, this puts status register bits back to interrupted state */
+ or t0,t1
+#elif __mips == 1
+ /* ints off, current & prev kernel mode on (kernel mode enabled is bit clear..argh!) */
+ li t1,SR_IEC | SR_KUP | SR_KUC
+ not t1
+ and t0, t1
+#endif
+ mtc0 t0, C0_SR
+ NOP
+
+
+ /*
+ * prepare to get out of interrupt
+ * return from interrupt (maybe to _ISR_Dispatch)
+ *
+ * LABEL "exit interrupt (simple case):"
+ * prepare to get out of interrupt
+ * return from interrupt
+ */
+
+_ISR_Handler_exit:
+
+/* restore interrupt context from stack */
+ LDREG t8, R_MDLO*R_SZ(sp)
+ LDREG t0, R_T0*R_SZ(sp)
+ mtlo t8
+ LDREG t8, R_MDHI*R_SZ(sp)
+ LDREG t1, R_T1*R_SZ(sp)
+ mthi t8
+ LDREG t2, R_T2*R_SZ(sp)
+ LDREG t3, R_T3*R_SZ(sp)
+ LDREG t4, R_T4*R_SZ(sp)
+ LDREG t5, R_T5*R_SZ(sp)
+ LDREG t6, R_T6*R_SZ(sp)
+ LDREG t7, R_T7*R_SZ(sp)
+ LDREG t8, R_T8*R_SZ(sp)
+ LDREG t9, R_T9*R_SZ(sp)
+ LDREG gp, R_GP*R_SZ(sp)
+ LDREG fp, R_FP*R_SZ(sp)
+ LDREG ra, R_RA*R_SZ(sp)
+ LDREG a0, R_A0*R_SZ(sp)
+ LDREG a1, R_A1*R_SZ(sp)
+ LDREG a2, R_A2*R_SZ(sp)
+ LDREG a3, R_A3*R_SZ(sp)
+ LDREG v1, R_V1*R_SZ(sp)
+ LDREG v0, R_V0*R_SZ(sp)
+
+ LDREG k1, R_EPC*R_SZ(sp)
+ mtc0 k1,C0_EPC
+
+ .set noat
+ LDREG AT, R_AT*R_SZ(sp)
+ .set at
+
+ ADDIU sp,sp,EXCP_STACK_SIZE
+
+_ISR_Handler_quick_exit:
+ eret
+ nop
+
+
+#if 0
+ .global int7_isr
+ .extern Interrupt_7_isr
+int7_isr:
+ /* Verify interrupt is from Timer */
+ la k0,IRCS /* read Interrupt Current Status register */
+ lw k0,(k0)
+ nop /* reading from external device */
+ li k1,IRCS_CAUSE_MASK
+ and k0,k0,k1 /* isolate interrupt cause */
+
+ li k1,INT7INT /* test for interrupt 7 */
+ subu k1,k0,k1
+ beq k1,zero,int7_isr1
+ nop
+ j ra /* interrupt 7 no longer valid, return without doing anything */
+ nop
+int7_isr1:
+ j Interrupt_7_isr /* Jump to Interrupt 7 isr */
+ nop
+#endif
+
+ .set reorder
+
+ENDFRAME(bsp_ISR_Handler)
+
+
+FRAME(_BRK_Handler,sp,0,ra)
+ .set noreorder
+
+#ifdef USC
+ la k0,INT_CFG3 /* Disable heartbeat interrupt in USC320, it interferes with PMON exception handler */
+ lw k1,(k0)
+ li k0,~HBI_MASK
+ and k1,k1,k0
+ la k0,INT_CFG3
+ sw k1,(k0)
+#endif
+
+ la k0,_brk_esr_link /* Jump to next exception handler in PMON exception chain */
+ lw k0,(k0)
+ lw k0,4(k0)
+ j k0
+ nop
+
+ .set reorder
+ENDFRAME(_BRK_Handler)
+
+
+/**************************************************************************
+**
+** init_exc_vecs() - moves the exception code into the addresses
+** reserved for exception vectors
+**
+** UTLB Miss exception vector at address 0x80000000
+**
+** General exception vector at address 0x80000080
+**
+** RESET exception vector is at address 0xbfc00000
+**
+***************************************************************************/
+
+FRAME(init_exc_vecs,sp,0,ra)
+ .set noreorder
+
+ .extern mon_onintr
+
+/* Install interrupt handler in PMON exception handling chain */
+
+ addiu sp,sp,-8
+ sw ra,(sp) /* Save ra contents on stack */
+ move a0,zero
+ la a1,_int_esr_link
+ jal mon_onintr /* Make PMON system call to install interrupt exception handler */
+ nop
+ li a0,9
+ la a1,_brk_esr_link
+ jal mon_onintr /* Make PMON system call to install break exception handler */
+ nop
+ lw ra,(sp)
+ addiu sp,sp,8 /* Restore ra contents from stack */
+ j ra
+ nop
+
+ .set reorder
+ENDFRAME(init_exc_vecs)
+
+
+#if 0 /* Unused code below */
+
+/*************************************************************
+* enable_int7(ints)
+* Enable interrupt 7
+*/
+FRAME(enable_int7,sp,0,ra)
+ .set noreorder
+
+ la t0,IRDM1 # Set interrupt controller detection mode (bits 2-3 = 0 for int 7 active low)
+ li t1,0x0
+ sw t1,(t0)
+
+ la t0,IRLVL4 # Set interrupt controller level (bit 8-10 = 2 for int 7 at level 2)
+ li t1,0x200
+ sw t1,(t0)
+
+ la t0,IRMSK # Set interrupt controller mask
+ li t1,0x0
+ sw t1,(t0)
+
+ la t0,IRDEN # Enable interrupts from controller
+ li t1,0x1
+ sw t1,(t0)
+
+ j ra
+ nop
+ .set reorder
+ENDFRAME(enable_int7)
+
+/*************************************************************
+* disable_int7(ints)
+* Disable interrupt 7
+*/
+FRAME(disable_int7,sp,0,ra)
+ .set noreorder
+
+ la t0,IRLVL4 # Set interrupt controller level (bit 8-10 = 0 to diasble int 7)
+ li t1,0x200
+ sw t1,(t0)
+
+ j ra
+ nop
+ .set reorder
+ENDFRAME(disable_int7)
+#endif
+
+/*************************************************************
+* exception:
+* Diagnostic code that can be hooked to PMON interrupt handler.
+* Generates pulse on PIO22 pin.
+* Called from _exception code in PMON (see mips.s of PMON).
+* Return address is located in k1.
+*/
+FRAME(tx49xxexception,sp,0,ra)
+ .set noreorder
+ la k0,k1tmp
+ sw k1,(k0)
+
+/* Activate TX49xx PIO22 signal for diagnostics */
+ lui k0,0xff1f
+ ori k0,k0,0xf500
+ lw k0,(k0)
+ lui k1,0x40
+ or k1,k1,k0
+ lui k0,0xff1f
+ ori k0,k0,0xf500
+ sw k1,(k0)
+ nop
+
+/* De-activate TX49xx PIO22 signal for diagnostics */
+ lui k0,0xff1f
+ ori k0,k0,0xf500
+ lw k0,(k0)
+ lui k1,0x40
+ not k1
+ and k1,k1,k0
+ lui k0,0xff1f
+ ori k0,k0,0xf500
+ sw k1,(k0)
+ nop
+
+ la k0,k1tmp
+ lw k1,(k0)
+ j k1
+ .set reorder
+ENDFRAME(tx49xxexception)
+
+
+
+
+ .data
+
+k1tmp: .word 0 /* Temporary strage for K1 during interrupt service */
+
+/*************************************************************
+*
+* Exception handler links, used in PMON exception handler chains
+*/
+ /* Interrupt exception service routine link */
+ .global _int_esr_link
+_int_esr_link:
+ .word 0
+ .word bsp_ISR_Handler
+
+ /* Break exception service routine link */
+ .global _brk_esr_link
+_brk_esr_link:
+ .word 0
+ .word _BRK_Handler
+
+
+
+
</font></pre>
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