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b369ff6efe
For anonymous shm, mmap now adds a shm_file and devzero behind it as two vm_objects. Faults are handled by copy_on_write(). Just as shadows copy r/w pages from original files, it should copy r/w pages from devzero into the shm_file in front. shmat/shmget uses mmap to set-up their areas. Untested yet so bugs expected. modified: tasks/libl4/src/init.c modified: tasks/mm0/include/shm.h modified: tasks/mm0/include/vm_area.h modified: tasks/mm0/src/fault.c modified: tasks/mm0/src/mmap.c modified: tasks/mm0/src/shm.c
43 lines
929 B
C
43 lines
929 B
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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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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#endif /* __SHM_H__ */
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