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Fix D-cache aliasing problem in the PIO IDE driver potencially resulting 

in the kernel or userspace seeing stale data.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2005-04-19 12:26:59 +00:00
parent ecba36dad8
commit 9447cbfc7a
1 changed files with 65 additions and 8 deletions
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73
include/asm-mips/mach-generic/ide.h
View File

@ -18,6 +18,7 @@
#include <linux/config.h>
#include <linux/pci.h>
#include <linux/stddef.h>
#include <asm/processor.h>
#ifndef MAX_HWIFS
# ifdef CONFIG_BLK_DEV_IDEPCI
@ -104,15 +105,71 @@ static __inline__ unsigned long ide_default_io_base(int index)
/* MIPS port and memory-mapped I/O string operations. */
#define __ide_insw insw
#define __ide_insl insl
#define __ide_outsw outsw
#define __ide_outsl outsl
static inline void __ide_flush_dcache_range(unsigned long addr, unsigned long size)
{
if (cpu_has_dc_aliases) {
unsigned long end = addr + size;
for (; addr < end; addr += PAGE_SIZE)
flush_dcache_page(virt_to_page(addr));
}
}
#define __ide_mm_insw readsw
#define __ide_mm_insl readsl
#define __ide_mm_outsw writesw
#define __ide_mm_outsl writesl
static inline void __ide_insw(unsigned long port, void *addr,
unsigned int count)
{
insw(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 2);
}
static inline void __ide_insl(unsigned long port, void *addr, unsigned int count)
{
insl(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 4);
}
static inline void __ide_outsw(unsigned long port, const void *addr,
unsigned long count)
{
outsw(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 2);
}
static inline void __ide_outsl(unsigned long port, const void *addr,
unsigned long count)
{
outsl(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 4);
}
static inline void __ide_mm_insw(void __iomem *port, void *addr, u32 count)
{
readsw(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 2);
}
static inline void __ide_mm_insl(void __iomem *port, void *addr, u32 count)
{
readsl(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 4);
}
static inline void __ide_mm_outsw(void __iomem *port, void *addr, u32 count)
{
writesw(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 2);
}
static inline void __ide_mm_outsl(void __iomem * port, void *addr, u32 count)
{
writesl(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 4);
}
/* ide_insw calls insw, not __ide_insw. Why? */
#undef insw
#undef insl
#define insw(port, addr, count) __ide_insw(port, addr, count)
#define insl(port, addr, count) __ide_insl(port, addr, count)
#endif /* __KERNEL__ */