mirror of
https://github.com/drasko/codezero.git
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0db0f7e334
- Updated sleeping paths such that a task is atomically put into a runqueue and made RUNNABLE, or removed from a runqueue and made SLEEPING. - Modified vma dropping sources to handle both copy_on_write() and exit() cases in a common function. - Added the first infrastructure to have a pager to suspend a task and wait for suspend completion from the scheduler.
136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
/*
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* Thread control block.
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*
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* Copyright (C) 2007, 2008 Bahadir Balban
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*/
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#ifndef __TASK_H__
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#define __TASK_H__
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#include <l4/macros.h>
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#include <l4/types.h>
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#include INC_GLUE(memlayout.h)
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#include <l4/lib/list.h>
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#include <l4lib/arch/types.h>
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#include <l4lib/utcb.h>
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#include <lib/addr.h>
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#include <l4/api/kip.h>
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#define __TASKNAME__ __PAGERNAME__
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#define TASK_FILES_MAX 32
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/* POSIX minimum is 4Kb */
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#define DEFAULT_ENV_SIZE SZ_4K
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#define DEFAULT_STACK_SIZE SZ_16K
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#define DEFAULT_UTCB_SIZE PAGE_SIZE
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enum tcb_create_flags {
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TCB_NO_SHARING = 0,
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TCB_SHARED_VM = 1,
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TCB_SHARED_FILES = 2,
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};
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struct vm_file;
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struct file_descriptor {
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unsigned long vnum;
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unsigned long cursor;
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struct vm_file *vmfile;
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};
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struct task_fd_head {
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struct file_descriptor fd[TASK_FILES_MAX];
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int tcb_refs;
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};
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struct task_vma_head {
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struct list_head list;
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int tcb_refs;
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};
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/* Stores all task information that can be kept in userspace. */
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struct tcb {
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/* Task list */
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struct list_head list;
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/* Name of the task */
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char name[16];
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/* Task ids */
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int tid;
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int spid;
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int tgid;
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/* Related task ids */
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unsigned int pagerid; /* Task's pager */
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/* Task's main address space region, usually USER_AREA_START/END */
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unsigned long start;
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unsigned long end;
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/* Page aligned program segment marks, ends exclusive as usual */
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unsigned long text_start;
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unsigned long text_end;
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unsigned long data_start;
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unsigned long data_end;
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unsigned long bss_start;
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unsigned long bss_end;
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unsigned long stack_start;
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unsigned long stack_end;
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unsigned long heap_start;
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unsigned long heap_end;
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unsigned long env_start;
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unsigned long env_end;
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unsigned long args_start;
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unsigned long args_end;
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/* Task's mmappable region */
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unsigned long map_start;
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unsigned long map_end;
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/* UTCB information */
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void *utcb;
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/* Virtual memory areas */
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struct task_vma_head *vm_area_head;
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/* File descriptors for this task */
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struct task_fd_head *files;
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};
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/* Structures to use when sending new task information to vfs */
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struct task_data {
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unsigned long tid;
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unsigned long utcb_address;
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};
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struct task_data_head {
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unsigned long total;
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struct task_data tdata[];
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};
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struct tcb *find_task(int tid);
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void task_add_global(struct tcb *t);
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int send_task_data(struct tcb *requester);
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void task_map_prefault_utcb(struct tcb *mapper, struct tcb *owner);
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int task_mmap_regions(struct tcb *task, struct vm_file *file);
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int task_setup_regions(struct vm_file *file, struct tcb *task,
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unsigned long task_start, unsigned long task_end);
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int task_setup_registers(struct tcb *task, unsigned int pc,
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unsigned int sp, l4id_t pager);
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struct tcb *tcb_alloc_init(unsigned int flags);
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int tcb_destroy(struct tcb *task);
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int task_exec(struct vm_file *f, unsigned long task_region_start,
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unsigned long task_region_end, struct task_ids *ids);
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int task_start(struct tcb *task, struct task_ids *ids);
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int copy_tcb(struct tcb *to, struct tcb *from, unsigned int flags);
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int task_release_vmas(struct task_vma_head *vma_head);
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struct tcb *task_create(struct tcb *orig,
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struct task_ids *ids,
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unsigned int ctrl_flags,
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unsigned int alloc_flags);
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#endif /* __TASK_H__ */
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