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refactoring pid_to_slot:

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- use constants instead of hardcoded values
- add more comments

git-svn-id: svn://kolibrios.org@8851 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Rustem Gimadutdinov (rgimad) 2021-06-14 11:48:48 +00:00
parent 31048e6d73
commit 75fe8b68da
2 changed files with 10 additions and 5 deletions
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1
kernel/trunk/const.inc
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@ -219,6 +219,7 @@ OS_BASE = 0x80000000
window_data = OS_BASE + 0x0001000 window_data = OS_BASE + 0x0001000
TASK_TABLE = OS_BASE + 0x0003000
CURRENT_TASK = OS_BASE + 0x0003000 CURRENT_TASK = OS_BASE + 0x0003000
TASK_COUNT = OS_BASE + 0x0003004 TASK_COUNT = OS_BASE + 0x0003004
TASK_BASE = OS_BASE + 0x0003010 TASK_BASE = OS_BASE + 0x0003010

10
kernel/trunk/core/taskman.inc
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@ -484,15 +484,19 @@ pid_to_slot:
push ebx push ebx
push ecx push ecx
mov ebx, [TASK_COUNT] 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 mov ecx, 2*32
.loop: .loop:
;ecx = offset of current process info entry ;ecx = offset of current process info entry
;ebx = maximum permitted offset ;ebx = maximum permitted offset
cmp byte [CURRENT_TASK+ecx+0xa], 9 ; state 9 means "not used"
cmp byte [TASK_TABLE+ecx+TASKDATA.state], 9
jz .endloop ;skip empty slots 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 jz .pid_found
.endloop: .endloop:
add ecx, 32 add ecx, 32