69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
#include "task.h"
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#include "alloc.h"
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#include "debug.h"
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#include "kpanic.h"
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#include "kprintf.h"
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#include "memory.h"
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#include <stdint.h>
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uint32_t esp_backup;
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static struct task *create_task(uint8_t owner_id)
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{
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static uint32_t pid = 1;
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struct task *new_task = vmalloc(sizeof(struct task));
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if (!new_task)
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return NULL;
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new_task->next = current_task->next;
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new_task->prev = current_task;
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current_task->next = new_task;
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new_task->owner_id = owner_id;
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new_task->esp0 = alloc_pages(STACK_SIZE, NULL);
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if (!new_task->esp0) {
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vfree(new_task);
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return NULL;
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}
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new_task->esp = new_task->esp0 + STACK_SIZE;
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new_task->pid = pid++;
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new_task->heap = alloc_pages(4096, (void **)&new_task->cr3);
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if (!new_task->heap) {
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free_pages(new_task->esp0, STACK_SIZE);
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vfree(new_task);
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return NULL;
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}
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return new_task;
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}
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int create_kernel_task(void)
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{
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struct task *new_task = vmalloc(sizeof(struct task));
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if (!new_task)
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return -1;
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new_task->status = RUN;
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new_task->owner_id = 0;
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new_task->pid = 0;
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new_task->heap = page_directory;
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new_task->cr3 = page_directory - KERNEL_START;
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new_task->prev = new_task;
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new_task->next = new_task;
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current_task = new_task;
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return 0;
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}
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void exec_fn(void (*fn)(void))
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{
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struct task *new_task = create_task(OWNER_KERNEL);
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if (!new_task)
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kpanic("failed to create new task");
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new_task->status = RUN;
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new_task->eip = (uint32_t *)fn;
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}
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/*
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* Create task
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* Allocate new pd => kmalloc(4096)
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* Add pd address to the struct task
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*
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*/
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