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Initial changes to libl4 for full and extended ipc.

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- Tag word will be used to specify full and extended ipc, and its size.
This commit is contained in:
Bahadir Balban
2009-05-13 16:08:37 +03:00
parent 44bf1db573
commit 680d20ff94
1 changed files with 44 additions and 2 deletions
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46
tasks/libl4/include/l4lib/arch-arm/syslib.h
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@@ -50,14 +50,56 @@ static inline void l4_set_sender(l4id_t sender)
write_mr(MR_SENDER, sender); write_mr(MR_SENDER, sender);
} }
#define L4_IPC_FLAGS_FULL 0x00001000 /* Full IPC involves full UTCB copy */
#define L4_IPC_FLAGS_EXTENDED 0x00002000 /* Extended IPC can page-fault and copy up to 2KB */
#define L4_IPC_FLAGS_MASK 0x0000F000
#define L4_IPC_TAG_MASK 0x00000FFF
#define L4_IPC_SIZE_MASK 0x0FFF0000
#define L4_IPC_SIZE_SHIFT 16
static inline void l4_set_ipc_size(unsigned int size)
{
unsigned int tag_flags = read_mr(MR_TAG);
tag_flags &= ~L4_IPC_SIZE_MASK;
tag_flags |= ((size << L4_IPC_SIZE_SHIFT) & L4_IPC_SIZE_MASK);
write_mr(MR_TAG, size);
}
static inline unsigned int l4_get_ipc_size(void)
{
return (read_mr(MR_TAG) >> L4_IPC_SIZE_SHIFT) & L4_IPC_SIZE_MASK;
}
static inline void l4_set_ipc_flags(unsigned int flags)
{
unsigned int tag_flags = read_mr(MR_TAG);
tag_flags &= ~L4_IPC_FLAGS_MASK;
tag_flags |= L4_IPC_FLAGS_MASK & flags;
write_mr(MR_TAG, tag_flags);
}
static inline unsigned int l4_get_ipc_flags(unsigned int flags)
{
return read_mr(MR_TAG) & L4_IPC_FLAGS_MASK;
}
static inline unsigned int l4_get_tag(void) static inline unsigned int l4_get_tag(void)
{ {
return read_mr(MR_TAG); return read_mr(MR_TAG) & L4_IPC_TAG_MASK;
} }
static inline void l4_set_tag(unsigned int tag) static inline void l4_set_tag(unsigned int tag)
{ {
write_mr(MR_TAG, tag); unsigned int tag_flags = read_mr(MR_TAG);
tag_flags &= ~L4_IPC_TAG_MASK;
tag_flags |= tag & L4_IPC_TAG_MASK;
write_mr(MR_TAG, tag_flags);
} }
/* /*