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74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
#ifndef _TASK_H
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#define _TASK_H
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#include <kernel.h>
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#define TASK_KERNEL 0 // Main kernel task ID
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enum {
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TASK_STATE_DEAD,
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TASK_STATE_IDLE,
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TASK_STATE_READY,
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TASK_STATE_RECV,
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};
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/*
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* Each task has an ID. This is used as a reference to the task.
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* A task has it's own paging setup, so it must have it's own pagedir.
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* Tasks have state. These states are defined as follows:
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* TASK_STATE_DEAD - This task has been killed
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* TASK_STATE_READY - This task is ready for scheduling
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* TASK_STATE_IDLE - This task doesn't need processor time
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* Each task has it's own kernel stack to push registers and such to when
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* context switching. To switch to a task, you load kstack_pointer into ESP and
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* pop the state.
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* The kstack_bottom is loaded into ESP using the TSS when switching from user
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* to kernel space on interrupts.
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* Tasks are stored in a linked list, so it must have a reference to the next
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* task.
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*
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* WARN: Be careful when modifing this struct, it's contents are accessed from
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* task.s which uses hardcoded offsets.
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*/
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struct task {
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pid_t id;
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size_t kstack_pointer;
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size_t kstack_bottom;
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uint32_t* pagedir;
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uint8_t state;
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int kernel_task;
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size_t heap_start;
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size_t heap_end;
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struct task* next;
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};
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// Describes contents of the kstack when task switching
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struct task_switch_ctx {
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uint32_t edi;
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uint32_t esi;
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uint32_t ebx;
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uint32_t ebp;
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uint32_t eip;
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};
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extern struct task* task_first;
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extern struct task* task_current;
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int task_init(void);
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void task_create(pid_t id, uint32_t eip, int kernel_task, uint32_t* pagedir, int argc, char** argv);
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void task_kill(pid_t id);
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void task_set_user_heap(pid_t id, size_t heap_end);
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struct task* task_get(pid_t id);
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uint8_t task_get_state(pid_t id);
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void task_set_state(pid_t id, uint8_t state);
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pid_t task_create_id(void);
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// Defined in task.s
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extern void task_switch(struct task* old, struct task* new);
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#endif
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