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203f053878
Previously a so-called utcb shared page was used for transfering data between posix services. This was a special shmat/get/dt case allocating from its own virtual pool. Now the term utcb is renamed as a shared page and integrated with the shm* handling routines. Generic l4 threads will use long-ipc and not this method. Posix services will continue to communicate on a shared page for now. modified: tasks/libl4/include/l4lib/ipcdefs.h modified: tasks/libl4/src/init.c new file: tasks/libposix/init.c modified: tasks/mm0/include/shm.h modified: tasks/mm0/include/task.h deleted: tasks/mm0/include/utcb.h modified: tasks/mm0/main.c modified: tasks/mm0/src/boot.c modified: tasks/mm0/src/clone.c modified: tasks/mm0/src/execve.c modified: tasks/mm0/src/exit.c modified: tasks/mm0/src/init.c modified: tasks/mm0/src/shm.c modified: tasks/mm0/src/task.c deleted: tasks/mm0/src/utcb.c deleted: tools/l4-qemu
72 lines
1.9 KiB
C
72 lines
1.9 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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/* Below is the special-case per-task default shared memory page prototypes */
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/* Prefaults shared page after mapping */
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#define SHPAGE_PREFAULT (1 << 0)
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/* Creates new shm segment for default shpage */
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#define SHPAGE_NEW_SHM (1 << 1)
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/* Allocates a virtual address for default shpage */
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#define SHPAGE_NEW_ADDRESS (1 << 2)
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/* IPC to send utcb address information to tasks */
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void *task_send_shpage_address(struct tcb *sender, l4id_t taskid);
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int shpage_map_to_task(struct tcb *owner, struct tcb *mapper, unsigned int flags);
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int shpage_unmap_from_task(struct tcb *owner, struct tcb *mapper);
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/* Prefault a *mmaped* default shared page */
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int shpage_prefault(struct tcb *task, unsigned int vmflags);
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#endif /* __SHM_H__ */
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