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Remove _userspace and move the idle task to assembly

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apio 2022-10-01 12:16:30 +02:00
parent 6e6cf5b2b0
commit 9012ccc49e
2 changed files with 13 additions and 44 deletions
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47
kernel/src/main.asm
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@ -4,41 +4,14 @@ extern _start
_main:
xor rbp, rbp
call _start
cli
.hang:
hlt
jmp .hang
global _userspace
_userspace:
mov rdi, 4000 ; 4000 ms / 4 seconds
mov rax, 2 ; sys_sleep
int 42h
cmp rax, 0
jne .fail ; syscall failed
mov rdi, .message
mov rsi, 33
mov rax, 3 ; sys_write
int 42h
cmp rax, 33
jne .fail ; syscall did not write enough bytes
.draw:
mov rax, 5 ; sys_rand
int 42h
mov r9, rax ; color
mov rdi, 20 ; x
mov rsi, 20 ; y
mov r10, 40 ; width
mov r8, 30 ; height
mov rax, 4 ; sys_paint
int 42h
cmp rax, 0
jne .fail
mov rdi, 100
mov rax, 2 ; sys_sleep
int 42h
cmp rax, 0
jne .fail
jmp .draw
.fail:
mov rax, 0 ; sys_exit
int 42h
jmp $ ; sys_exit failed, nothing more we can do
.message:
db "userspace preparing for painting", 0xA
global idle_task_function
idle_task_function:
sti
.idle:
hlt
jmp .idle

10
kernel/src/thread/Scheduler.cpp
View File

@ -25,10 +25,7 @@ static Task* sched_current_task;
static Task* base_task;
static Task* end_task;
static void idle_task_function()
{
while (1) asm volatile("hlt");
}
extern "C" void idle_task_function();
static uint64_t frequency;
@ -36,12 +33,11 @@ void Scheduler::init()
{
memset(&idle_task, 0, sizeof(Task));
idle_task.id = free_tid++;
idle_task.regs.rip = (uint64_t)&idle_task_function;
idle_task.regs.rip = (uint64_t)idle_task_function;
idle_task.regs.rsp = (uint64_t)MemoryManager::get_page();
idle_task.regs.cs = 0x08;
idle_task.regs.ss = 0x10;
asm volatile("pushfq; movq (%%rsp), %%rax; movq %%rax, %0; popfq;" : "=m"(idle_task.regs.rflags)::"%rax");
idle_task.regs.rflags |= 0x200;
idle_task.regs.rflags = (1 << 21) | (1 << 9);
idle_task.task_sleep = 1000;
idle_task.state = idle_task.Idle;