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we have only to change CR3, if we switch the address space

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This commit is contained in:
Stefan Lankes 2015-07-25 00:25:35 +02:00
parent 2f784b54aa
commit 3f2c339da1
1 changed files with 5 additions and 2 deletions
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7
hermit/arch/x86/kernel/tasks.c
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@ -45,12 +45,15 @@ size_t* get_current_stack(void)
uint32_t core_id = CORE_ID;
task_t* curr_task = per_core(current_task);
size_t stptr = ((size_t) curr_task->stack + KERNEL_STACK_SIZE - 0x10) & ~0xF;
size_t cr3;
set_per_core(kernel_stack, stptr);
task_state_segments[core_id].rsp0 = stptr;
// use new page table
write_cr3(curr_task->page_map);
cr3 = read_cr3();
// do we change the address space?
if (cr3 != curr_task->page_map)
write_cr3(curr_task->page_map); // use new page table
return curr_task->last_stack_pointer;
}