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https://github.com/drasko/codezero.git
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b20fda9341
- Added cleaner allocation of shm addresses by moving the allocation to do_mmap(). - Added deletion routine for all objects: shadow, vm_file of type vfs_file, shm_file, etc. - Need to make sure objects get deleted properly after exit(). - Currently we allow a single, unique virtual address for each shm segment.
51 lines
1.2 KiB
C
51 lines
1.2 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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int shm_pool_init();
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void *shmat_shmget_internal(struct tcb *task, key_t key, void *shmaddr);
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struct vm_file *shm_new(key_t key, unsigned long npages);
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void *shm_new_address(int npages);
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#endif /* __SHM_H__ */
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