Added platfrom_m5 - Our hacked up tsunami palcode and modified palcode

makefile to that end. Additionally made a change in console to
preserve t7 on call back because linux uses it for the "current"
pointer.

console/Makefile:
    Changed makefile back to using gcc and gas rather then trying to
    cross-compile for now
console/console.c:
    Put code in to save t7 on CallBackFixup() call and changed the
    system type to Tsunami
palcode/Makefile:
    updated palcode makefile to have targets for tlaser and tsunami

system/alpha/console/Makefile

@@ -7,10 +7,8 @@ INCLUDES        = -I$(PALCODE) -I$(INCLUDEH) -I$(M5)/dev
 SOURDIR = ./
 PALCODE  = ../palcode
 INCLUDEH = ../h
-AS=alpha-elf-as
+CC=gcc
-CC=alpha-elf-gcc
+AS=gas
-CXX=alpha-elf-$(CXX)
-
 
 dbmentry.o: dbmentry.s 
 	$(AS)  $(INCLUDES) -nointrinsics -o $*.o $*.s
@@ -22,12 +20,12 @@ printf.o: printf.c
 	$(CC)  -g3 $(INCLUDES) -nointrinsics -o $*.o -c $*.c
 
 paljtokern.s.o: paljtokern.s
-	$(CXX) -I ../palcode -E -P -nostdinc -nostdinc++ -x c++ paljtokern.s | \
+	g++ -I ../palcode -E -P -nostdinc -nostdinc++ -x c++ paljtokern.s | \
-	$(AS) -m 21164 -o paljtokern.s.o
+	gas -m 21164 -o paljtokern.s.o
 
 paljtoslave.s.o: paljtoslave.s
-	$(CXX) -I ../palcode -E -P -nostdinc -nostdinc++ -x c++ paljtoslave.s | \
+	g++ -I ../palcode -E -P -nostdinc -nostdinc++ -x c++ paljtoslave.s | \
-	$(AS) -m 21164 -o paljtoslave.s.o
+	gas -m 21164 -o paljtoslave.s.o
 
 paljtokern.c: paljtokern.s.o
 	echo 'unsigned int palJToKern[] = {' > paljtokern.c

system/alpha/console/console.c

@@ -27,7 +27,6 @@ typedef unsigned int uint32;
 #include "rpb.h"
 #include "cserve.h"
 
-
 #define CONS_INT_TX   0x01  /* interrupt enable / state bits */
 #define CONS_INT_RX   0x02
 
@@ -206,8 +205,8 @@ struct rpb xxm_rpb = {
 #if 0
    0x12,		/* 050: system type - masquarade as some random 21064 */
 #endif
-   12, /* masquerade a DEC_3000_500 (bugnion) */
+   34, /* masquerade a Tsunami RGD */
-   (2<<1),		/* 058: system variation */
+   (1<<10),		/* 058: system variation */
    'c'|('o'<<8)|('o'<<16)|('l'<< 24),		/* 060: system revision */
    1024*4096,		/* 068: scaled interval clock intr freq  OVERRIDEN*/
    0,			/* 070: cycle counter frequency */
@@ -1184,7 +1183,23 @@ CallBackDispatcher(long a0, long a1, long a2, long a3, long a4)
 
 long CallBackFixup(int a0, int a1, int a2)
 {
-   printf("CallbackFixup %x %x \n",a0,a1);
+   long temp;
+   /* Linux uses r8 for the current pointer (pointer to data structure
+      contating info about currently running process). It is set when the
+      kernel starts and is expected to remain there... Problem is that the
+      unlike the kernel, the console does not prevent the assembler from
+      using r8. So here is a work around. So far this has only been a problem
+      in CallBackFixup() but any other call back functions could cause a problem
+      at some point */
+
+   /* save off the current pointer to a temp variable */
+   asm("bis $8, $31, %0" : "=r" (temp));
+
+   /* call original code */
+   printf("CallbackFixup %x %x, t7=%x\n",a0,a1,temp);
+
+   /* restore the current pointer */
+   asm("bis %0, $31, $8" : : "r" (temp) : "$8");
 
 #if 0
   if (first[FIRST(a1)]==0) {

system/alpha/palcode/Makefile

@@ -11,9 +11,10 @@ CFLAGS=-I . -E -P -D SIMOS -D BUILD_PALCODE -nostdinc -nostdinc++ -x c++
 GASFLAGS=-m21164
 LDFLAGS=-Ttext 0x4000
 
-SOURCES=osfpal.s platform_tlaser.s
+SOURCES=osfpal.s platform_tlaser.s platform_m5.s
 PREPROC := $(SOURCES:.s=.i)
-OBJS := $(SOURCES:.s=.o)
+TLOBJS = osfpal.o platform_tlaser.o
+TSOBJS = osfpal.o platform_m5.o
     
 %.i: %.s
 	$(CC) $(CFLAGS) $< > $@
@@ -21,9 +22,14 @@ OBJS := $(SOURCES:.s=.o)
 %.o: %.i
 	$(GAS) $(GASFLAGS) -o $@ $< 
 
+all: tlaser tsunami
+        
+tlaser: $(PREPROC) $(TLOBJS)
+	$(LD) $(LDFLAGS) -o tl_osfpal $(TLOBJS) 
 
-all: $(PREPROC) $(OBJS)
+tsunami: $(PREPROC) $(TSOBJS)
-	$(LD) $(LDFLAGS) -o osfpal $(OBJS) 
+	$(LD) $(LDFLAGS) -o ts_osfpal $(TSOBJS) 
 
 clean:
 	rm -f *.o *.i osfpal
+