mirror of
https://github.com/drasko/codezero.git
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35d2d275b6
- fixed is_err(x), was evaluating x twice, resulting in calling a function x twice. - Divided task initialisation into multiple parts. - MM0 now creates a tcb for itself and maintains memory regions of its own. - MM0's tcb is used for mmapping other tasks' regions. MM0 mmaps and prefaults those regions, instead of the typical mmap() and fault approach used by non-pager tasks. For example there's an internal shmget_shmat() path to map in other tasks' shm utcbs. Those mappings are then prefaulted into mm0's address space using the default fault handling path. - FS0 now reads task data into its utcb from mm0 via a syscall. FS0 shmat()s to utcbs of other tasks, e.g. mm0 and test0. FS0 then crashes, that is to be fixed and where this commit is left last.
93 lines
1.8 KiB
C
93 lines
1.8 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/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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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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/* 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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/* 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 list_head vm_area_list;
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/* File descriptors for this task */
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struct file_descriptor fd[TASK_FILES_MAX];
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};
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struct tcb *find_task(int tid);
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struct initdata;
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void init_pm(struct initdata *initdata);
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int send_task_data(l4id_t requester);
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#endif /* __TASK_H__ */
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