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8b16be9185
Many of the license and Intel copyright headers include the "All rights reserved" string. It is not relevant in the context of the BSD-3-Clause license that the code is released under. This patch removes those strings throughout the code (hypervisor, devicemodel and misc). Tracked-On: #7254 Signed-off-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <types.h>
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#include <asm/lib/bits.h>
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#include <asm/page.h>
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#include <logmsg.h>
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struct page *alloc_page(struct page_pool *pool)
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{
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struct page *page = NULL;
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uint64_t loop_idx, idx, bit;
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spinlock_obtain(&pool->lock);
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for (loop_idx = pool->last_hint_id;
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loop_idx < (pool->last_hint_id + pool->bitmap_size); loop_idx++) {
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idx = loop_idx % pool->bitmap_size;
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if (*(pool->bitmap + idx) != ~0UL) {
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bit = ffz64(*(pool->bitmap + idx));
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bitmap_set_nolock(bit, pool->bitmap + idx);
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page = pool->start_page + ((idx << 6U) + bit);
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pool->last_hint_id = idx;
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break;
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}
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}
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spinlock_release(&pool->lock);
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ASSERT(page != NULL, "no page aviable!");
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page = (page != NULL) ? page : pool->dummy_page;
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if (page == NULL) {
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/* For HV MMU pagetable mapping, we didn't use dummy page when there's no page
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* aviable in the page pool. This because we only do MMU pagetable mapping on
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* the early boot time and we reserve enough pages for it. After that, we would
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* not do any MMU pagetable mapping. We would let the system boot fail when page
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* allocation failed.
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*/
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panic("no dummy aviable!");
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}
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(void)memset(page, 0U, PAGE_SIZE);
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return page;
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}
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/*
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*@pre: ((page - pool->start_page) >> 6U) < pool->bitmap_size
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*/
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void free_page(struct page_pool *pool, struct page *page)
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{
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uint64_t idx, bit;
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spinlock_obtain(&pool->lock);
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idx = (page - pool->start_page) >> 6U;
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bit = (page - pool->start_page) & 0x3fUL;
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bitmap_clear_nolock(bit, pool->bitmap + idx);
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spinlock_release(&pool->lock);
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}
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