forked from luck/tmp_suning_uos_patched
116d753308
Most I/O in the kernel is done using the kernel offset mapping. However, there is one API that uses aliased kernel address ranges: > The final category of APIs is for I/O to deliberately aliased address > ranges inside the kernel. Such aliases are set up by use of the > vmap/vmalloc API. Since kernel I/O goes via physical pages, the I/O > subsystem assumes that the user mapping and kernel offset mapping are > the only aliases. This isn't true for vmap aliases, so anything in > the kernel trying to do I/O to vmap areas must manually manage > coherency. It must do this by flushing the vmap range before doing > I/O and invalidating it after the I/O returns. For this reason, we should use the hardware lpa instruction to load the physical address of kernel virtual addresses in the driver code. I believe we only use the vmap/vmalloc API with old PA 1.x processors which don't have a sba, so we don't hit this problem. Tested on c3750, c8000 and rp3440. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PARISC_SPECIAL_INSNS_H
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#define __PARISC_SPECIAL_INSNS_H
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#define lpa(va) ({ \
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unsigned long pa; \
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__asm__ __volatile__( \
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"copy %%r0,%0\n\t" \
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"lpa %%r0(%1),%0" \
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: "=r" (pa) \
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: "r" (va) \
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: "memory" \
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); \
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pa; \
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})
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#define lpa_user(va) ({ \
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unsigned long pa; \
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__asm__ __volatile__( \
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"copy %%r0,%0\n\t" \
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"lpa %%r0(%%sr3,%1),%0" \
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: "=r" (pa) \
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: "r" (va) \
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: "memory" \
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); \
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pa; \
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})
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#define mfctl(reg) ({ \
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unsigned long cr; \
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__asm__ __volatile__( \
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"mfctl " #reg ",%0" : \
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"=r" (cr) \
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); \
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cr; \
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})
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#define mtctl(gr, cr) \
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__asm__ __volatile__("mtctl %0,%1" \
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: /* no outputs */ \
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: "r" (gr), "i" (cr) : "memory")
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/* these are here to de-mystefy the calling code, and to provide hooks */
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/* which I needed for debugging EIEM problems -PB */
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#define get_eiem() mfctl(15)
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static inline void set_eiem(unsigned long val)
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{
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mtctl(val, 15);
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}
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#define mfsp(reg) ({ \
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unsigned long cr; \
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__asm__ __volatile__( \
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"mfsp " #reg ",%0" : \
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"=r" (cr) \
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); \
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cr; \
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})
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#define mtsp(val, cr) \
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{ if (__builtin_constant_p(val) && ((val) == 0)) \
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__asm__ __volatile__("mtsp %%r0,%0" : : "i" (cr) : "memory"); \
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else \
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__asm__ __volatile__("mtsp %0,%1" \
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: /* no outputs */ \
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: "r" (val), "i" (cr) : "memory"); }
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#endif /* __PARISC_SPECIAL_INSNS_H */
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