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4f346cea53
utcb as a shared page instead of the message registers. Implemented the code that passes task information from mm0 to fs0 using the fs0 utcb. The code seems to work OK but: There's an issue with anon pages that they end up on the same swapfile and with same file offsets (e.g. utcb and stack at offset 0). Need to fix this issue but otherwise this implementation seems to work. TODO: - Separate anon regions into separate vmfiles. - Possibly map the stacks from virtual files so that they can be read from userspace in the future for debugging. - Possibly utcb could be created as a shared memory object using shmget/shmat during startup.
50 lines
1021 B
C
50 lines
1021 B
C
#ifndef __ARM_UTCB_H__
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#define __ARM_UTCB_H__
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#define USER_UTCB_REF 0xFF000FF0
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#define L4_KIP_ADDRESS 0xFF000000
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#define UTCB_KIP_OFFSET 0xFF0
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#ifndef __ASSEMBLY__
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#include <l4lib/types.h>
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#include <l4/macros.h>
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#include INC_GLUE(message.h)
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/*
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* NOTE: In syslib.h the first few mrs are used by data frequently
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* needed for all ipcs. Those mrs are defined the kernel message.h
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*/
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/* Compact utcb for now! :-) */
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struct utcb {
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u32 mr[MR_TOTAL];
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u32 tid; /* Thread id */
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/*
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* For passing ipc data larger than mrs,
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* that is, if the callee is allowed to map it
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*/
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char buf[];
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};
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extern struct utcb *utcb;
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static inline struct utcb *l4_get_utcb()
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{
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return utcb;
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// (struct utcb **)USER_UTCB_REF;
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}
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/* Functions to read/write utcb registers */
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static inline unsigned int read_mr(int offset)
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{
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return l4_get_utcb()->mr[offset];
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}
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static inline void write_mr(unsigned int offset, unsigned int val)
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{
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l4_get_utcb()->mr[offset] = val;
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* __ARM_UTCB_H__ */
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