6a39dd6222
Patch from Daniel Jacobowitz
The ARM kernel has several uses of asm("foo%?"). %? is a GCC internal
modifier used to output conditional execution predicates. However, no
version of GCC supports conditionalizing asm statements. GCC 4.2 will
correctly expand %? to the empty string in user asms. Earlier versions may
reuse the condition from the previous instruction. In 'if (foo) asm
("bar%?");' this is somewhat likely to be right... but not reliable.
So, the only safe thing to do is to remove the uses of %?. I believe
the tlbflush.h occurances were supposed to be removed before, based
on the comment about %? not working at the top of that file.
Old versions of GCC could omit branches around user asms if the asm didn't
mark the condition codes as clobbered. This problem hasn't been seen on any
recent (3.x or 4.x) GCC, but it could theoretically happen. So, where
%? was removed a cc clobber was added.
Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/*
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* linux/include/asm-arm/arch-l7200/io.h
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*
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* Copyright (C) 2000 Steve Hill (sjhill@cotw.com)
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*
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* Changelog:
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* 03-21-2000 SJH Created from linux/include/asm-arm/arch-nexuspci/io.h
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* 08-31-2000 SJH Added in IO functions necessary for new drivers
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*/
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#ifndef __ASM_ARM_ARCH_IO_H
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#define __ASM_ARM_ARCH_IO_H
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#include <asm/hardware.h>
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#define IO_SPACE_LIMIT 0xffffffff
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/*
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* There are not real ISA nor PCI buses, so we fake it.
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*/
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#define __io_pci(a) ((void __iomem *)(PCIO_BASE + (a)))
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#define __mem_pci(a) (a)
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#define __ioaddr(p) __io_pci(p)
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/*
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* Generic virtual read/write
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*/
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#define __arch_getb(a) (*(volatile unsigned char *)(a))
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#define __arch_getl(a) (*(volatile unsigned int *)(a))
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static inline unsigned int __arch_getw(unsigned long a)
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{
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unsigned int value;
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__asm__ __volatile__("ldrh %0, [%1, #0] @ getw"
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: "=&r" (value)
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: "r" (a) : "cc");
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return value;
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}
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#define __arch_putb(v,a) (*(volatile unsigned char *)(a) = (v))
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#define __arch_putl(v,a) (*(volatile unsigned int *)(a) = (v))
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static inline void __arch_putw(unsigned int value, unsigned long a)
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{
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__asm__ __volatile__("strh %0, [%1, #0] @ putw"
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: : "r" (value), "r" (a) : "cc");
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}
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/*
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* Translated address IO functions
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*
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* IO address has already been translated to a virtual address
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*/
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#define outb_t(v,p) (*(volatile unsigned char *)(p) = (v))
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#define inb_t(p) (*(volatile unsigned char *)(p))
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#define outw_t(v,p) (*(volatile unsigned int *)(p) = (v))
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#define inw_t(p) (*(volatile unsigned int *)(p))
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#define outl_t(v,p) (*(volatile unsigned long *)(p) = (v))
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#define inl_t(p) (*(volatile unsigned long *)(p))
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/*
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* FIXME - These are to allow for linking. On all the other
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* ARM platforms, the entire IO space is contiguous.
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* The 7200 has three separate IO spaces. The below
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* macros will eventually become more involved. Use
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* with caution and don't be surprised by kernel oopses!!!
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*/
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#define inb(p) inb_t(p)
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#define inw(p) inw_t(p)
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#define inl(p) inl_t(p)
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#define outb(v,p) outb_t(v,p)
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#define outw(v,p) outw_t(v,p)
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#define outl(v,p) outl_t(v,p)
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#endif
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