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54a9b2901d
- Now libl4 has no references to utcb page or shmat etc. - Pager does not deal with special case utcb page allocation. It instead allocates a shared page from shm memory pool. - All tasks working to original standard. Next: - Add per-thread utcb allocation from the kernel - Add larger register file for standard ipc - Add long ipc (up to 1Kb)
46 lines
1015 B
C
46 lines
1015 B
C
/*
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* A default shared page is used by every thread
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* to pass large data for system calls.
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*
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* This file contains relevant shpage definitions.
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*/
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#ifndef __LIBPOSIX_SHPAGE_H__
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#define __LIBPOSIX_SHPAGE_H__
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#include <l4/macros.h>
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#include <l4lib/arch/syscalls.h>
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#include <l4lib/arch/syslib.h>
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#include <l4lib/ipcdefs.h>
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#include <l4lib/utcb.h>
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#include INC_GLUE(memory.h)
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extern void *shared_page;
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int shared_page_init(void);
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/*
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* Arguments that are too large to fit in message registers are
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* copied onto another area that is still on the utcb, and the servers
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* map-in the task utcb and read those arguments from there.
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*/
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static inline int copy_to_shpage(void *arg, int offset, int size)
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{
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if (offset + size > PAGE_SIZE)
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return -1;
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memcpy(shared_page + offset, arg, size);
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return 0;
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}
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static inline int copy_from_shpage(void *buf, int offset, int size)
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{
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if (offset + size > PAGE_SIZE)
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return -1;
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memcpy(buf, shared_page + offset, size);
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return 0;
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}
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#endif /* __LIBPOSIX_SHPAGE_H__ */
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