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#include "vm-page.h" |
#include "vm-page.h" |
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#include "trace.h" |
#include "trace.h" |
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#ifndef NBUCKETS |
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# define NBUCKETS 7 |
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#endif |
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#define MINSHIFT 4 |
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/* True if the buckets has been initialized. */ |
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static bool malloc_buckets_initialized = false; |
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/* Structure describing malloc:ed memory block. */ |
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struct malloc_block |
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{ |
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struct queue_entry *bucket; |
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char data [0]; |
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}; |
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/* Malloc memory buckets. */ |
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static struct queue_entry malloc_buckets [NBUCKETS]; |
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/* Convenience macro for returning size of bucket I. */ |
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#define bucket_size(i) (1 << ((i) + MINSHIFT)) |
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/* Insert pages into OBJECT at [OFFSET, OFFSET+SIZE) with protection |
/* Insert pages into OBJECT at [OFFSET, OFFSET+SIZE) with protection |
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PROTECTION. Returns address of memory block. */ |
PROTECTION. Returns address of memory block. */ |
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void |
void |
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vm_kmem_init (vm_offset_t virtual_start, vm_offset_t virtual_end) |
vm_kmem_init (vm_offset_t virtual_start, vm_offset_t virtual_end) |
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{ |
{ |
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int i; |
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if (virtual_start != virtual_end && virtual_start != VM_KERN_MIN_ADDRESS) |
if (virtual_start != virtual_end && virtual_start != VM_KERN_MIN_ADDRESS) |
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{ |
{ |
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kern_return_t kr; |
kern_return_t kr; |
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VM_PROT_ALL, VM_PROT_ALL, VM_INHERIT_NONE); |
VM_PROT_ALL, VM_PROT_ALL, VM_INHERIT_NONE); |
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assert (kr == KERN_SUCCESS); |
assert (kr == KERN_SUCCESS); |
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} |
} |
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for (i = 0; i < NBUCKETS; i++) |
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queue_init (& malloc_buckets [i]); |
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malloc_buckets_initialized = true; |
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} |
} |
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return map_pages (offset, size, pa, VM_PROT_ALL); |
return map_pages (offset, size, pa, VM_PROT_ALL); |
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} |
} |
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/* Function return bucket number for a memory block of SIZE. |
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Returns -1 if we found no bucket. */ |
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static inline int bucket_number (vm_size_t size) |
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{ |
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int cnt, pos = 1 << MINSHIFT; |
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for (cnt = 0; cnt < NBUCKETS; cnt++) |
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{ |
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if (pos >= size) |
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return cnt; |
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pos <<= 1; |
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} |
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return -1; |
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} |
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/* Allocate SIZE bytes. Zero fill it if ZERO_P is true. |
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SIZE should not be near the page size. */ |
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void * |
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kmem_malloc1 (vm_size_t size, bool zero_p) |
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{ |
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struct queue_entry *bucket; |
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struct malloc_block *block; |
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int cnt, bucket_nr, total; |
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assert (malloc_buckets_initialized); |
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total = size + sizeof (struct malloc_block); |
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bucket_nr = bucket_number (total); |
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assert (bucket_nr >= 0); |
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bucket = &malloc_buckets [bucket_nr]; |
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/* Check if we have to allocate more memory for this bucket. */ |
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if (queue_empty (bucket)) |
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{ |
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struct queue_entry *entry; |
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vm_offset_t memory; |
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memory = kmem_alloc_wired (VM_MAP_KERNEL (), VM_PAGE_SIZE); |
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assert (memory); |
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/* Loop through entries and enqueue them to bucket. */ |
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for (cnt = VM_PAGE_SIZE / bucket_size (bucket_nr); cnt; ) |
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{ |
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entry = (struct queue_entry *) memory; |
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memory = memory + bucket_size (bucket_nr); |
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enqueue (bucket, entry); |
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cnt --; |
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} |
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} |
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block = (struct malloc_block *) dequeue (bucket); |
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block->bucket = bucket; |
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if (zero_p) |
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memset (block->data, 0, size); |
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return (void *) block->data; |
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} |
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/* Free memory that was allocated with kmem_malloc or kmem_zalloc. */ |
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void |
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kmem_mfree (void *data) |
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{ |
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struct malloc_block *block; |
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block = (struct malloc_block *) ((vm_offset_t) data - sizeof *block); |
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enqueue (block->bucket, (struct queue_entry *) block); |
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} |
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