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1256f1a13a
UTCB support has beed added. It has the same drawback as in the stack support: the area in question has to be already mapped-in. There are also some minor fixes for the stack support and the utcb common helper routines.
90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
/*
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* UTCB management in Codezero
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*
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* Copyright © 2009 B Labs Ltd
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*/
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#include <stdio.h>
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#include <addr.h>
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#include <utcb-common.h>
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#include <malloc/malloc.h>
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/* Globally disjoint utcb virtual region pool */
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static struct address_pool utcb_region_pool;
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int utcb_pool_init(unsigned long utcb_start, unsigned long utcb_end)
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{
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int err;
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/* Initialise the global utcb virtual address pool */
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if ((err = address_pool_init(&utcb_region_pool,
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utcb_start, utcb_end,
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UTCB_SIZE) < 0)) {
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printf("UTCB address pool initialisation failed.\n");
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return err;
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}
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return 0;
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}
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static inline void *utcb_new_address(int npages)
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{
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return address_new(&utcb_region_pool, npages);
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}
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static inline int utcb_delete_address(void *utcb_address, int npages)
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{
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return address_del(&utcb_region_pool, utcb_address, npages);
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}
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/* Return an empty utcb slot in this descriptor */
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unsigned long utcb_new_slot(struct utcb_desc *desc)
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{
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int slot;
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if ((slot = id_new(desc->slots)) < 0)
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return 0;
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else
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return desc->utcb_base + (unsigned long)slot * UTCB_SIZE;
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}
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int utcb_delete_slot(struct utcb_desc *desc, unsigned long address)
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{
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BUG_ON(id_del(desc->slots, (address - desc->utcb_base)
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/ UTCB_SIZE) < 0);
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return 0;
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}
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struct utcb_desc *utcb_new_desc(void)
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{
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struct utcb_desc *d;
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/* Allocate a new descriptor */
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if (!(d = kzalloc(sizeof(*d))))
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return 0;
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link_init(&d->list);
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/* We currently assume UTCB is smaller than PAGE_SIZE */
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BUG_ON(UTCB_SIZE > PAGE_SIZE);
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/* Initialise utcb slots */
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d->slots = id_pool_new_init(PAGE_SIZE / UTCB_SIZE);
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/* Obtain a new and unique utcb base */
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/* FIXME: Use variable size than a page */
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d->utcb_base = (unsigned long)utcb_new_address(1);
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return d;
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}
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int utcb_delete_desc(struct utcb_desc *desc)
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{
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/* Return descriptor address */
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utcb_delete_address((void *)desc->utcb_base, 1);
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/* Free the descriptor */
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kfree(desc);
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return 0;
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}
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