mirror of https://gitee.com/openkylin/linux.git
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/kd.h>
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#include <linux/tty.h>
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#include <linux/console.h>
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#include <asm/setup.h>
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#include <asm/bootinfo.h>
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#include <asm/system.h>
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#include <asm/pgtable.h>
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#include <asm/apollodma.h>
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#include <asm/io.h>
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/* note only works for 16 Bit 1 page DMA's */
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static unsigned short next_free_xlat_entry=0;
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unsigned short dma_map_page(unsigned long phys_addr,int count,int type) {
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unsigned long page_aligned_addr=phys_addr & (~((1<<12)-1));
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unsigned short start_map_addr=page_aligned_addr >> 10;
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unsigned short free_xlat_entry, *xlat_map_entry;
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int i;
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free_xlat_entry=next_free_xlat_entry;
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for(i=0,xlat_map_entry=addr_xlat_map+(free_xlat_entry<<2);i<8;i++,xlat_map_entry++) {
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#if 0
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printk("phys_addr: %x, page_aligned_addr: %x, start_map_addr: %x\n",phys_addr,page_aligned_addr,start_map_addr+i);
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#endif
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out_be16(xlat_map_entry, start_map_addr+i);
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}
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next_free_xlat_entry+=2;
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if(next_free_xlat_entry>125)
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next_free_xlat_entry=0;
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#if 0
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printk("next_free_xlat_entry: %d\n",next_free_xlat_entry);
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#endif
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return free_xlat_entry<<10;
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}
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void dma_unmap_page(unsigned short dma_addr) {
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return ;
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}
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