diff options
Diffstat (limited to 'system/alpha/console/console.c')
| -rw-r--r-- | system/alpha/console/console.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/system/alpha/console/console.c b/system/alpha/console/console.c index 0697be63a..844cb4ddc 100644 --- a/system/alpha/console/console.c +++ b/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) */ - (2<<1), /* 058: system variation */ + 34, /* masquerade a Tsunami RGD */ + (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) { |