66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
#ifndef KERNEL_HANDLE_H_
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#define KERNEL_HANDLE_H_
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#include <kernel/bitmap.h>
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#include <mango/status.h>
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#include <stddef.h>
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#include <stdint.h>
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/* subtract 32 bytes to account for the handle bitmap */
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#define HANDLES_PER_TABLE ((4096 - 32) / sizeof(struct handle))
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#define REFS_PER_TABLE ((4096 - 64) / sizeof(struct handle_table *))
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typedef uint32_t kern_handle_t;
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typedef uintptr_t handle_flags_t;
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struct task;
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struct object;
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struct handle_list;
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struct handle {
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struct object *h_object;
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handle_flags_t h_flags;
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};
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struct handle_table {
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union {
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struct {
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/* bitmap tracks which bits in t_handle_list are
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* allocated */
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DECLARE_BITMAP(t_handle_map, HANDLES_PER_TABLE);
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struct handle t_handle_list[HANDLES_PER_TABLE];
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} t_handles;
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struct {
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/* bitmap tracks which sub-tables are fully-allocated */
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DECLARE_BITMAP(t_subtable_map, REFS_PER_TABLE);
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struct handle_table *t_subtable_list[REFS_PER_TABLE];
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} t_subtables;
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};
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};
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extern struct handle_table *handle_table_create(void);
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extern void handle_table_destroy(struct handle_table *tab);
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extern kern_status_t handle_table_alloc_handle(
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struct handle_table *tab,
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struct handle **out_slot,
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kern_handle_t *out_handle);
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extern kern_status_t handle_table_free_handle(
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struct handle_table *tab,
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kern_handle_t handle);
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extern struct handle *handle_table_get_handle(
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struct handle_table *tab,
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kern_handle_t handle);
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extern kern_status_t handle_list_transfer(
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struct handle_table *dest,
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struct handle_list *dest_list,
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size_t dest_list_count,
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struct handle_table *src,
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const struct handle_list *src_list,
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size_t src_list_count);
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#endif
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