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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.
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
/*
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* Copyright (C) 2008 Bahadir Balban
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*/
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#ifndef __SHM_H__
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#define __SHM_H__
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#include <l4/lib/list.h>
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#include <l4/api/space.h>
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#include <l4/macros.h>
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#include <l4lib/types.h>
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#include <task.h>
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#include <posix/sys/ipc.h>
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#include <posix/sys/shm.h>
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#include <posix/sys/types.h>
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struct shm_descriptor {
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int key;
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l4id_t shmid;
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void *shm_addr;
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unsigned long npages;
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struct vm_file *devzero;
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};
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#if 0
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struct shm_descriptor {
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int key; /* IPC key supplied by user task */
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l4id_t shmid; /* SHM area id, allocated by mm0 */
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struct list_head list; /* SHM list, used by mm0 */
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struct vm_file *owner;
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void *shm_addr; /* The virtual address for segment. */
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unsigned long size; /* Size of the area in pages */
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unsigned int flags;
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int refcnt;
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};
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#endif
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#define SHM_AREA_MAX 64 /* Up to 64 shm areas */
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/* Up to 10 pages per area, and at least 1 byte (implies 1 page) */
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#define SHM_SHMMIN 1
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#define SHM_SHMMAX 10
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/* Initialises shared memory bookkeeping structures */
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void shm_init();
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void *shmat_shmget_internal(key_t key, void *shmaddr);
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struct vm_file *shm_new(key_t key, unsigned long npages);
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#endif /* __SHM_H__ */
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