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88e3706474
Capability checking for thread_control, exregs, mutex, cap_control,
ipc, and map system calls.
The visualised model is implemented in code that compiles, but
actual functionality hasn't been tested.
Need to add:
- Dynamic assignment of initial resources matching with what's
defined in the configuration.
- A paged-thread-group, since that would be a logical group of
seperation from a capability point-of-view.
- Resource ids for various tasks. E.g.
- Memory capabilities don't have target resources.
- Thread capability assumes current container for THREAD_CREATE.
- Mutex syscall assumes current thread (this one may not need
any changing)
- cap_control syscall assumes current thread. It may happen to
be that another thread's capability list is manipulated.
Last but not least:
- A simple and easy-to-use userspace library for dynamic expansion
of resource domains as new resources are created such as threads.
69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
/*
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* Generic address space related information.
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#ifndef __SPACE_H__
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#define __SPACE_H__
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/* The flags not embedded in the name behave as expected. E.g USR_RW is also */
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#define MAP_USR_RW_FLAGS 0 /* CB as one would expect */
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#define MAP_USR_RO_FLAGS 1 /* CB as one would expect */
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#define MAP_SVC_RW_FLAGS 2 /* CB as one would expect */
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#define MAP_USR_IO_FLAGS 3 /* Non-CB, RW TODO: How about RO one? */
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#define MAP_SVC_IO_FLAGS 4 /* Non-CB, RW */
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/* Some default aliases */
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#define MAP_USR_DEFAULT_FLAGS MAP_USR_RW_FLAGS
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#define MAP_SVC_DEFAULT_FLAGS MAP_SVC_RW_FLAGS
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#define MAP_IO_DEFAULT_FLAGS MAP_SVC_IO_FLAGS
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#if defined (__KERNEL__)
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#include <l4/lib/spinlock.h>
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#include <l4/lib/list.h>
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#include <l4/lib/mutex.h>
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#include <l4/lib/idpool.h>
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#include <l4/generic/capability.h>
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#include INC_SUBARCH(mm.h)
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/* A simple page table with a reference count */
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struct address_space {
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l4id_t spid;
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struct link list;
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struct mutex lock;
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pgd_table_t *pgd;
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/* Capabilities shared by threads in same space */
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struct cap_list cap_list;
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int ktcb_refs;
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};
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struct address_space_list {
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struct link list;
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/* Lock for list add/removal */
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struct spinlock list_lock;
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/* Used when delete/creating spaces */
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struct mutex ref_lock;
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int count;
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};
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struct address_space *address_space_create(struct address_space *orig);
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void address_space_delete(struct address_space *space);
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void address_space_attach(struct ktcb *tcb, struct address_space *space);
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struct address_space *address_space_find(l4id_t spid);
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void address_space_add(struct address_space *space);
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void address_space_remove(struct address_space *space);
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void address_space_reference_lock();
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void address_space_reference_unlock();
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void init_address_space_list(struct address_space_list *space_list);
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int check_access(unsigned long vaddr, unsigned long size,
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unsigned int flags, int page_in);
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int check_access_task(unsigned long vaddr, unsigned long size,
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unsigned int flags, int page_in, struct ktcb *task);
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#endif
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#endif /* __SPACE_H__ */
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