40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
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#ifndef THREADS_SWITCH_H
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#define THREADS_SWITCH_H
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#ifndef __ASSEMBLER__
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/* switch_thread()'s stack frame. */
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struct switch_threads_frame
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{
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uint32_t edi; /* 0: Saved %edi. */
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uint32_t esi; /* 4: Saved %esi. */
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uint32_t ebp; /* 8: Saved %ebp. */
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uint32_t ebx; /* 12: Saved %ebx. */
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void (*eip) (void); /* 16: Return address. */
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struct thread *cur; /* 20: switch_threads()'s CUR argument. */
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struct thread *next; /* 24: switch_threads()'s NEXT argument. */
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};
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/* Switches from CUR, which must be the running thread, to NEXT,
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which must also be running switch_threads(), returning CUR in
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NEXT's context. */
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struct thread *switch_threads (struct thread *cur, struct thread *next);
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/* Stack frame for switch_entry(). */
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struct switch_entry_frame
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{
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void (*eip) (void);
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};
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void switch_entry (void);
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/* Pops the CUR and NEXT arguments off the stack, for use in
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initializing threads. */
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void switch_thunk (void);
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#endif
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/* Offsets used by switch.S. */
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#define SWITCH_CUR 20
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#define SWITCH_NEXT 24
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#endif /* threads/switch.h */
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