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/********************************************************/
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/********************************************************/
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#include <ntapi/nt_status.h>
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#include <ntapi/nt_blitter.h>
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#include <ntapi/nt_sync.h>
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#include <ntapi/ntapi.h>
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#include <ntapi/nt_atomic.h>
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#include "ntapi_blitter.h"
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#include "ntapi_impl.h"
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static int __blt_popcount(uintptr_t mask)
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{
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uintptr_t i;
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int ret;
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for (i=0,ret=0; i<8*sizeof(uintptr_t); i++)
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if (mask & ((uintptr_t)1<
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ret++;
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return ret;
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}
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int32_t __fastcall __ntapi_blt_alloc(
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__out nt_blitter ** blitter,
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__in nt_blitter_params * params)
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{
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int32_t status;
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nt_blitter * blt_ctx;
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size_t blt_ctx_size;
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size_t params_size;
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size_t ptrs,i;
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if (params->block_count % sizeof(uintptr_t))
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return NT_STATUS_INVALID_PARAMETER;
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else if (!params->region && (params->block_size % sizeof(uintptr_t)))
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return NT_STATUS_INVALID_PARAMETER;
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ptrs = params->block_count / (8 * sizeof(uintptr_t));
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blt_ctx = (nt_blitter *)0;
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blt_ctx_size = (size_t)&((nt_blitter *)0)->bits;
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/* user-provided bitmap? */
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if (!params->bitmap)
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blt_ctx_size += ptrs * sizeof(uintptr_t);
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status = __ntapi->zw_allocate_virtual_memory(
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NT_CURRENT_PROCESS_HANDLE,
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(void **)&blt_ctx,
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0,
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&blt_ctx_size,
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NT_MEM_COMMIT,
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NT_PAGE_READWRITE);
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if (status) return (status);
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__ntapi->tt_aligned_block_memset(
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blt_ctx,
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0,(size_t)&((nt_blitter *)0)->bits);
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blt_ctx->addr = blt_ctx;
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blt_ctx->size = blt_ctx_size;
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blt_ctx->ptrs = ptrs;
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blt_ctx->bitmap = params->bitmap
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? (uintptr_t *)params->bitmap
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: blt_ctx->bits;
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if (!(params->flags & NT_BLITTER_PRESERVE_BITS))
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__ntapi->tt_aligned_block_memset(
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blt_ctx->bitmap,
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0xFFFFFFFFFFFFFFFF,
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ptrs * sizeof(uintptr_t));
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blt_ctx->info.info_size = sizeof(nt_blitter_info);
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blt_ctx->info.block_count = params->block_count;
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blt_ctx->info.block_size = params->block_size;
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if (params->flags & NT_BLITTER_ENABLE_BLOCK_ARRAY)
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/* allocate in place */
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blt_ctx->info.region_size = params->block_count * params->block_size;
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else
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blt_ctx->info.region_size = params->block_count * sizeof(uintptr_t);
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if (params->region)
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blt_ctx->info.region_addr = params->region;
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else
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status = __ntapi->zw_allocate_virtual_memory(
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NT_CURRENT_PROCESS_HANDLE,
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&blt_ctx->info.region_addr,
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0,
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&blt_ctx->info.region_size,
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NT_MEM_COMMIT,
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NT_PAGE_READWRITE);
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if (status) {
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__ntapi->blt_free(blt_ctx);
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return status;
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}
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if (params->flags & NT_BLITTER_PRESERVE_BITS)
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for (i=0,blt_ctx->info.blocks_avail=0; i
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blt_ctx->info.blocks_avail += __blt_popcount(blt_ctx->bitmap[i]);
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else
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blt_ctx->info.blocks_avail = params->block_count;
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if (params->flags & NT_BLITTER_ENABLE_BLOCK_ARRAY)
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blt_ctx->info.blocks_cached = params->block_count;
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if (!params->region)
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__ntapi->tt_aligned_block_memset(
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blt_ctx->info.region_addr,
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0,blt_ctx->info.region_size);
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/* copy params */
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if (params->params_size < sizeof(nt_blitter_params))
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params_size = params->params_size;
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else
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params_size = sizeof(nt_blitter_params);
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__ntapi->tt_aligned_block_memcpy(
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(uintptr_t *)&blt_ctx->params,
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(uintptr_t *)params,
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params_size);
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blt_ctx->params.lock_tries = params->lock_tries
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? params->lock_tries
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: __NT_BLITTER_DEFAULT_LOCK_TRIES;
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blt_ctx->params.round_trips = params->round_trips
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? params->round_trips
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: __NT_BLITTER_DEFAULT_ROUND_TRIPS;
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*blitter = blt_ctx;
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return NT_STATUS_SUCCESS;
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}
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