aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/include/asm/scatterlist.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/include/asm/scatterlist.h')
-rw-r--r--arch/x86/include/asm/scatterlist.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/x86/include/asm/scatterlist.h b/arch/x86/include/asm/scatterlist.h
new file mode 100644
index 00000000000..263d397d2ee
--- /dev/null
+++ b/arch/x86/include/asm/scatterlist.h
@@ -0,0 +1,33 @@
+#ifndef _ASM_X86_SCATTERLIST_H
+#define _ASM_X86_SCATTERLIST_H
+
+#include <asm/types.h>
+
+struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
+ unsigned long page_link;
+ unsigned int offset;
+ unsigned int length;
+ dma_addr_t dma_address;
+ unsigned int dma_length;
+};
+
+#define ARCH_HAS_SG_CHAIN
+#define ISA_DMA_THRESHOLD (0x00ffffff)
+
+/*
+ * These macros should be used after a pci_map_sg call has been done
+ * to get bus addresses of each of the SG entries and their lengths.
+ * You should only work with the number of sg entries pci_map_sg
+ * returns.
+ */
+#define sg_dma_address(sg) ((sg)->dma_address)
+#ifdef CONFIG_X86_32
+# define sg_dma_len(sg) ((sg)->length)
+#else
+# define sg_dma_len(sg) ((sg)->dma_length)
+#endif
+
+#endif /* _ASM_X86_SCATTERLIST_H */