Bochs/bochs/patches/patch.tsc-zwane

----------------------------------------------------------------------
Patch name: patch.tsc-zwane
Author: Zwane Mwaikambo <zwane@linuxpower.ca>
Date: Sat Dec 14 01:30:22 EST 2002

Detailed description:

Revised TSC patch that calls tick at the right time

Patch was created with:
  cvs diff -u
Apply patch to what version:
  cvs checked out on DATE, release version VER
Instructions:
  To patch, go to main bochs directory.
  Type "patch -p0 < THIS_PATCH_FILE".
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Index: cpu/cpu.h
===================================================================
RCS file: /cvsroot/bochs/bochs/cpu/cpu.h,v
retrieving revision 1.119
diff -u -r1.119 cpu.h
--- cpu/cpu.h	25 Nov 2002 21:58:47 -0000	1.119
+++ cpu/cpu.h	14 Dec 2002 06:21:24 -0000
@@ -1411,7 +1411,8 @@
 #endif
 
 #if BX_CPU_LEVEL >= 5
-  bx_regs_msr_t msr;  
+  bx_regs_msr_t msr;
+  Bit64u tsc;
 #endif
 
   i387_t the_i387;
Index: cpu/proc_ctrl.cc
===================================================================
RCS file: /cvsroot/bochs/bochs/cpu/proc_ctrl.cc,v
retrieving revision 1.63
diff -u -r1.63 proc_ctrl.cc
--- cpu/proc_ctrl.cc	13 Nov 2002 21:00:04 -0000	1.63
+++ cpu/proc_ctrl.cc	14 Dec 2002 06:21:27 -0000
@@ -1682,9 +1682,9 @@
   bx_bool cpl = CPL;
   if ((tsd==0) || (tsd==1 && cpl==0)) {
     // return ticks
-    Bit64u ticks = bx_pc_system.time_ticks ();
+    Bit64u ticks = BX_CPU_THIS_PTR tsc;
     RAX = (Bit32u) (ticks & 0xffffffff);
-    RDX = (Bit32u) ((ticks >> 32) & 0xffffffff);
+    RDX = (Bit32u) ticks >> 32;
     //BX_INFO(("RDTSC: returning EDX:EAX = %08x:%08x", EDX, EAX));
   } else {
     // not allowed to use RDTSC!
@@ -1720,10 +1720,6 @@
       /* TODO */
       return;
 
-    case BX_MSR_TSC:
-      RDTSC(i);
-      return;
-
     case BX_MSR_CESR:
       /* TODO */
       return;
@@ -1734,10 +1730,6 @@
       /* do nothing */
       return;
 
-    case BX_MSR_TSC:
-      RDTSC(i);
-      return;
-
     /* ... And these cause an exception on i686 */
     case BX_MSR_CESR:
     case BX_MSR_CTR0:
@@ -1745,6 +1737,10 @@
       goto do_exception;
 #endif  /* BX_CPU_LEVEL == 5 */
 
+    case BX_MSR_TSC:
+      RDTSC(i);
+      return;
+
     /* MSR_APICBASE
        0:7    Reserved
        8    This is set if its the BSP
@@ -1842,7 +1838,6 @@
     /* The following registers are defined for Pentium only */
     case BX_MSR_P5_MC_ADDR:
     case BX_MSR_MC_TYPE:
-    case BX_MSR_TSC:
     case BX_MSR_CESR:
       /* TODO */
       return;
@@ -1850,7 +1845,6 @@
     /* These are noops on i686... */
     case BX_MSR_P5_MC_ADDR:
     case BX_MSR_MC_TYPE:
-    case BX_MSR_TSC:
       /* do nothing */
       return;
 
@@ -1860,6 +1854,12 @@
     case BX_MSR_CTR1:
       goto do_exception;
 #endif  /* BX_CPU_LEVEL == 5 */
+
+    case BX_MSR_TSC:
+    /* we ignore the high 32bits */
+    BX_CPU_THIS_PTR tsc = (Bit64u)EAX;
+    BX_INFO(("WRMSR: wrote %08x:%08x to MSR_TSC\n", 0, EAX));
+      return;
 
     /* MSR_APICBASE
        0:7    Reserved
Index: pc_system.h
===================================================================
RCS file: /cvsroot/bochs/bochs/pc_system.h,v
retrieving revision 1.22
diff -u -r1.22 pc_system.h
--- pc_system.h	25 Oct 2002 11:44:33 -0000	1.22
+++ pc_system.h	14 Dec 2002 06:21:28 -0000
@@ -27,7 +27,7 @@
 
 
 
-#define BX_MAX_TIMERS (15+BX_SMP_PROCESSORS)
+#define BX_MAX_TIMERS (128+BX_SMP_PROCESSORS)
 #define BX_NULL_TIMER_HANDLE 10000
 
 
@@ -113,6 +113,9 @@
     if (--bx_pc_system.currCountdown == 0) {
       bx_pc_system.countdownEvent();
       }
+    for (int i = 0; i < BX_SMP_PROCESSORS; i++)
+      BX_CPU(i)->tsc++;
+ 
     }
   static BX_CPP_INLINE void tickn(Bit64u n) {
 #if BX_SHOW_IPS
@@ -130,6 +133,9 @@
     // 'n' is not (or no longer) >= the countdown size.  We can just decrement
     // the remaining requested ticks and continue.
     bx_pc_system.currCountdown -= Bit32u(n);
+    for (int i = 0; i < BX_SMP_PROCESSORS; i++)
+      BX_CPU(i)->tsc+=n;
+
     }
 
   int register_timer_ticks(void* this_ptr, bx_timer_handler_t, Bit64u ticks,