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x86: provide a bad_dma_address symbol for i386

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It's initially 0, since we don't expect any DMA there.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Glauber Costa
2008-03-25 18:36:36 -03:00
committed by Ingo Molnar
parent b48ee71352
commit 7c18341665
3 changed files with 6 additions and 1 deletions
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4
arch/x86/kernel/pci-dma_32.c
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@@ -14,6 +14,10 @@
#include <linux/module.h> #include <linux/module.h>
#include <asm/io.h> #include <asm/io.h>
/* For i386, we make it point to the NULL address */
dma_addr_t bad_dma_address __read_mostly = 0x0;
EXPORT_SYMBOL(bad_dma_address);
struct dma_coherent_mem { struct dma_coherent_mem {
void *virt_base; void *virt_base;
u32 device_base; u32 device_base;

2
include/asm-x86/dma-mapping.h
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@@ -10,6 +10,8 @@
#include <asm/io.h> #include <asm/io.h>
#include <asm/swiotlb.h> #include <asm/swiotlb.h>
extern dma_addr_t bad_dma_address;
struct dma_mapping_ops { struct dma_mapping_ops {
int (*mapping_error)(dma_addr_t dma_addr); int (*mapping_error)(dma_addr_t dma_addr);
void* (*alloc_coherent)(struct device *dev, size_t size, void* (*alloc_coherent)(struct device *dev, size_t size,

1
include/asm-x86/dma-mapping_64.h
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@@ -1,7 +1,6 @@
#ifndef _X8664_DMA_MAPPING_H #ifndef _X8664_DMA_MAPPING_H
#define _X8664_DMA_MAPPING_H 1 #define _X8664_DMA_MAPPING_H 1
extern dma_addr_t bad_dma_address;
extern int iommu_merge; extern int iommu_merge;
static inline int dma_mapping_error(dma_addr_t dma_addr) static inline int dma_mapping_error(dma_addr_t dma_addr)