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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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273 lines
5.5 KiB
C
273 lines
5.5 KiB
C
/*
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* Copyright 1998-2003 VIA Technologies, Inc. All Rights Reserved.
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* Copyright 2001-2003 S3 Graphics, Inc. All Rights Reserved.
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* Copyright 2000 Silicon Integrated Systems Corp, Inc., HsinChu, Taiwan.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sub license,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* VIA, S3 GRAPHICS, AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "drmP.h"
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#include "via_ds.h"
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extern unsigned int VIA_DEBUG;
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set_t *via_setInit(void)
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{
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int i;
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set_t *set;
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set = (set_t *) drm_alloc(sizeof(set_t), DRM_MEM_DRIVER);
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for (i = 0; i < SET_SIZE; i++) {
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set->list[i].free_next = i + 1;
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set->list[i].alloc_next = -1;
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}
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set->list[SET_SIZE - 1].free_next = -1;
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set->free = 0;
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set->alloc = -1;
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set->trace = -1;
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return set;
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}
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int via_setAdd(set_t * set, ITEM_TYPE item)
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{
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int free = set->free;
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if (free != -1) {
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set->list[free].val = item;
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set->free = set->list[free].free_next;
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} else {
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return 0;
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}
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set->list[free].alloc_next = set->alloc;
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set->alloc = free;
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set->list[free].free_next = -1;
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return 1;
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}
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int via_setDel(set_t * set, ITEM_TYPE item)
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{
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int alloc = set->alloc;
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int prev = -1;
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while (alloc != -1) {
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if (set->list[alloc].val == item) {
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if (prev != -1)
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set->list[prev].alloc_next =
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set->list[alloc].alloc_next;
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else
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set->alloc = set->list[alloc].alloc_next;
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break;
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}
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prev = alloc;
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alloc = set->list[alloc].alloc_next;
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}
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if (alloc == -1)
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return 0;
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set->list[alloc].free_next = set->free;
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set->free = alloc;
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set->list[alloc].alloc_next = -1;
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return 1;
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}
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/* setFirst -> setAdd -> setNext is wrong */
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int via_setFirst(set_t * set, ITEM_TYPE * item)
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{
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if (set->alloc == -1)
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return 0;
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*item = set->list[set->alloc].val;
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set->trace = set->list[set->alloc].alloc_next;
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return 1;
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}
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int via_setNext(set_t * set, ITEM_TYPE * item)
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{
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if (set->trace == -1)
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return 0;
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*item = set->list[set->trace].val;
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set->trace = set->list[set->trace].alloc_next;
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return 1;
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}
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int via_setDestroy(set_t * set)
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{
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drm_free(set, sizeof(set_t), DRM_MEM_DRIVER);
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return 1;
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}
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#define ISFREE(bptr) ((bptr)->free)
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#define fprintf(fmt, arg...) do{}while(0)
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memHeap_t *via_mmInit(int ofs, int size)
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{
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PMemBlock blocks;
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if (size <= 0)
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return NULL;
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blocks = (TMemBlock *) drm_calloc(1, sizeof(TMemBlock), DRM_MEM_DRIVER);
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if (blocks) {
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blocks->ofs = ofs;
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blocks->size = size;
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blocks->free = 1;
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return (memHeap_t *) blocks;
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} else
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return NULL;
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}
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static TMemBlock *SliceBlock(TMemBlock * p,
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int startofs, int size,
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int reserved, int alignment)
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{
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TMemBlock *newblock;
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/* break left */
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if (startofs > p->ofs) {
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newblock =
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(TMemBlock *) drm_calloc(1, sizeof(TMemBlock),
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DRM_MEM_DRIVER);
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newblock->ofs = startofs;
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newblock->size = p->size - (startofs - p->ofs);
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newblock->free = 1;
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newblock->next = p->next;
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p->size -= newblock->size;
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p->next = newblock;
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p = newblock;
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}
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/* break right */
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if (size < p->size) {
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newblock =
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(TMemBlock *) drm_calloc(1, sizeof(TMemBlock),
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DRM_MEM_DRIVER);
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newblock->ofs = startofs + size;
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newblock->size = p->size - size;
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newblock->free = 1;
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newblock->next = p->next;
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p->size = size;
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p->next = newblock;
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}
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/* p = middle block */
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p->align = alignment;
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p->free = 0;
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p->reserved = reserved;
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return p;
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}
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PMemBlock via_mmAllocMem(memHeap_t * heap, int size, int align2,
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int startSearch)
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{
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int mask, startofs, endofs;
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TMemBlock *p;
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if (!heap || align2 < 0 || size <= 0)
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return NULL;
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mask = (1 << align2) - 1;
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startofs = 0;
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p = (TMemBlock *) heap;
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while (p) {
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if (ISFREE(p)) {
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startofs = (p->ofs + mask) & ~mask;
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if (startofs < startSearch)
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startofs = startSearch;
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endofs = startofs + size;
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if (endofs <= (p->ofs + p->size))
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break;
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}
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p = p->next;
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}
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if (!p)
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return NULL;
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p = SliceBlock(p, startofs, size, 0, mask + 1);
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p->heap = heap;
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return p;
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}
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static __inline__ int Join2Blocks(TMemBlock * p)
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{
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if (p->free && p->next && p->next->free) {
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TMemBlock *q = p->next;
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p->size += q->size;
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p->next = q->next;
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drm_free(q, sizeof(TMemBlock), DRM_MEM_DRIVER);
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return 1;
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}
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return 0;
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}
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int via_mmFreeMem(PMemBlock b)
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{
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TMemBlock *p, *prev;
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if (!b)
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return 0;
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if (!b->heap) {
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fprintf(stderr, "no heap\n");
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return -1;
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}
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p = b->heap;
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prev = NULL;
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while (p && p != b) {
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prev = p;
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p = p->next;
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}
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if (!p || p->free || p->reserved) {
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if (!p)
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fprintf(stderr, "block not found in heap\n");
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else if (p->free)
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fprintf(stderr, "block already free\n");
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else
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fprintf(stderr, "block is reserved\n");
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return -1;
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}
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p->free = 1;
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Join2Blocks(p);
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if (prev)
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Join2Blocks(prev);
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return 0;
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}
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