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This implements the infrastructure for read/write system calls where file content is first searched in mm0's page cache and then read-in or written via the vfs read/write functions. modified: tasks/fs0/src/syscalls.c modified: tasks/mm0/include/lib/bit.h modified: tasks/mm0/include/lib/idpool.h modified: tasks/mm0/include/task.h modified: tasks/mm0/include/vm_area.h modified: tasks/mm0/main.c modified: tasks/mm0/src/devzero.c modified: tasks/mm0/src/fault.c new file: tasks/mm0/src/file.c modified: tasks/mm0/src/init.c modified: tasks/mm0/src/lib/bit.c modified: tasks/mm0/src/lib/idpool.c modified: tasks/mm0/src/task.c
45 lines
890 B
C
45 lines
890 B
C
#ifndef __LIB_BIT_H__
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#define __LIB_BIT_H__
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#include <l4lib/types.h>
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unsigned int __clz(unsigned int bitvector);
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int find_and_set_first_free_bit(u32 *word, unsigned int lastbit);
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int find_and_set_first_free_contig_bits(u32 *word, unsigned int limit,
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int nbits);
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int check_and_clear_bit(u32 *word, int bit);
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int check_and_clear_contig_bits(u32 *word, int first, int nbits);
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int check_and_set_bit(u32 *word, int bit);
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/* Set */
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static inline void setbit(unsigned int *w, unsigned int flags)
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{
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*w |= flags;
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}
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/* Clear */
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static inline void clrbit(unsigned int *w, unsigned int flags)
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{
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*w &= ~flags;
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}
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/* Test */
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static inline int tstbit(unsigned int *w, unsigned int flags)
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{
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return *w & flags;
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}
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/* Test and clear */
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static inline int tstclr(unsigned int *w, unsigned int flags)
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{
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int res = tstbit(w, flags);
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clrbit(w, flags);
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return res;
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}
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#endif /* __LIB_BIT_H__ */
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