refactoring pid_to_slot:

- use constants instead of hardcoded values
- add more comments

git-svn-id: svn://kolibrios.org@8851 a494cfbc-eb01-0410-851d-a64ba20cac60

kernel/trunk/const.inc

@@ -219,6 +219,7 @@ OS_BASE             = 0x80000000
 
 window_data         = OS_BASE + 0x0001000
 
+TASK_TABLE          = OS_BASE + 0x0003000
 CURRENT_TASK        = OS_BASE + 0x0003000
 TASK_COUNT          = OS_BASE + 0x0003004
 TASK_BASE           = OS_BASE + 0x0003010

kernel/trunk/core/taskman.inc

@@ -484,15 +484,19 @@ pid_to_slot:
         push    ebx
         push    ecx
         mov     ebx, [TASK_COUNT]
-        shl     ebx, 5
+        shl     ebx, 5 ; ebx *= 32 (32 is size of TASKDATA struct)
+        ; add 2*32 cause:
+        ; 0x80003000 - 0x80003020 isnt a task actually
+        ; skip first process in the task table
         mov     ecx, 2*32
 
 .loop:
-;ecx=offset of current process info entry
-;ebx=maximum permitted offset
-        cmp     byte [CURRENT_TASK+ecx+0xa], 9
+;ecx = offset of current process info entry
+;ebx = maximum permitted offset
+        ; state 9 means "not used"
+        cmp     byte [TASK_TABLE+ecx+TASKDATA.state], 9
         jz      .endloop ;skip empty slots
-        cmp     [CURRENT_TASK+ecx+0x4], eax;check PID
+        cmp     [TASK_TABLE+ecx+TASKDATA.pid], eax;check PID
         jz      .pid_found
 .endloop:
         add     ecx, 32