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60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/*
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* This module allocates an unused address range from
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* a given memory region defined as the pool range.
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#include <lib/bit.h>
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#include <l4/macros.h>
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#include <l4/types.h>
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#include INC_GLUE(memory.h)
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#include <lib/addr.h>
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#include <printf.h>
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/*
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* Initializes an address pool, but uses an already
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* allocated id pool for it.
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*/
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int address_pool_init_with_idpool(struct address_pool *pool,
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struct id_pool *idpool,
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unsigned long start, unsigned long end)
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{
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pool->idpool = idpool;
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pool->start = start;
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pool->end = end;
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return 0;
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}
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int address_pool_init(struct address_pool *pool, unsigned long start, unsigned long end)
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{
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if ((pool->idpool = id_pool_new_init(__pfn(end - start))) < 0)
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return (int)pool->idpool;
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pool->start = start;
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pool->end = end;
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return 0;
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}
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void *address_new(struct address_pool *pool, int npages)
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{
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unsigned int pfn;
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if ((int)(pfn = ids_new_contiguous(pool->idpool, npages)) < 0)
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return 0;
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return (void *)__pfn_to_addr(pfn) + pool->start;
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}
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int address_del(struct address_pool *pool, void *addr, int npages)
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{
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unsigned long pfn = __pfn(page_align(addr) - pool->start);
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if (ids_del_contiguous(pool->idpool, pfn, npages) < 0) {
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printf("%s: Invalid address range returned to "
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"virtual address pool.\n", __FUNCTION__);
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return -1;
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}
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return 0;
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}
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