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Capability replicate/split/destroy/grant working for test0 ipc.

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Implemented a protocol between a client and its pager to
request and get a capability to ipc to another client of the pager.

Pager first ensures the request is valid from its client.
It then tries to use a greater capability that it possesses, to
produce a new capability that the client requested. Once the kernel
validates the correct one and replicates/reduces it to client's
need, it grants it to the client.
This commit is contained in:
Bahadir Balban
2009-11-09 00:40:07 +02:00
parent 1bb2c05c9b
commit b24c8eb89d
7 changed files with 195 additions and 78 deletions
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1
include/l4/api/capability.h
View File

@@ -14,6 +14,7 @@
#define CAP_CONTROL_REPLICATE 0x00000005
#define CAP_CONTROL_SPLIT 0x00000006
#define CAP_CONTROL_DEDUCE 0x00000007
#define CAP_CONTROL_DESTROY 0x00000008
#define CAP_SHARE_MASK 0x00000003
#define CAP_SHARE_SINGLE 0x00000001

5
include/l4/generic/cap-types.h
View File

@@ -108,6 +108,7 @@
#define CAP_CAP_REPLICATE (1 << 3)
#define CAP_CAP_SPLIT (1 << 4)
#define CAP_CAP_DEDUCE (1 << 5)
#define CAP_CAP_MODIFY (CAP_CAP_SPLIT | CAP_CAP_DEDUCE)
#define CAP_CAP_DESTROY (1 << 6)
#define CAP_CAP_MODIFY (CAP_CAP_DEDUCE | CAP_CAP_SPLIT \
| CAP_CAP_DESTROY)
#endif /* __CAP_TYPES_H__ */

9
include/l4/generic/capability.h
View File

@@ -99,6 +99,13 @@ static inline void cap_list_insert(struct capability *cap,
clist->ncaps++;
}
static inline void cap_list_remove(struct capability *cap,
struct cap_list *clist)
{
list_remove(&cap->list);
clist->ncaps--;
}
/* Detach a whole list of capabilities from list head */
static inline struct capability *
cap_list_detach(struct cap_list *clist)
@@ -141,6 +148,8 @@ struct capability *cap_list_find_by_rtype(struct cap_list *clist,
unsigned int rtype);
struct capability *cap_find_byid(l4id_t capid);
int cap_find_destroy(l4id_t capid);
/* Capability checking on system calls */
int cap_map_check(struct ktcb *task, unsigned long phys, unsigned long virt,
unsigned long npages, unsigned int flags);