/* * This flag is used to indicate that the page pointed to by a pte is clean * and does not require cleaning before returning it to the user.
*/ #define PG_dcache_clean PG_arch_1
#ifdef CONFIG_PPC_BOOK3S_64 /* * Book3s has no ptesync after setting a pte, so without this ptesync it's * possible for a kernel virtual mapping access to return a spurious fault * if it's accessed right after the pte is set. The page fault handler does * not expect this type of fault. flush_cache_vmap is not exactly the right * place to put this, but it seems to work well enough.
*/ staticinlinevoid flush_cache_vmap(unsignedlong start, unsignedlong end)
{ asmvolatile("ptesync" ::: "memory");
} #define flush_cache_vmap flush_cache_vmap #endif/* CONFIG_PPC_BOOK3S_64 */
#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 /* * This is called when a page has been modified by the kernel. * It just marks the page as not i-cache clean. We do the i-cache * flush later when the page is given to a user process, if necessary.
*/ staticinlinevoid flush_dcache_folio(struct folio *folio)
{ if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) return; /* avoid an atomic op if possible */ if (test_bit(PG_dcache_clean, &folio->flags))
clear_bit(PG_dcache_clean, &folio->flags);
} #define flush_dcache_folio flush_dcache_folio
/** * flush_dcache_range(): Write any modified data cache blocks out to memory and * invalidate them. Does not invalidate the corresponding instruction cache * blocks. * * @start: the start address * @stop: the stop address (exclusive)
*/ staticinlinevoid flush_dcache_range(unsignedlong start, unsignedlong stop)
{ unsignedlong shift = l1_dcache_shift(); unsignedlong bytes = l1_dcache_bytes(); void *addr = (void *)(start & ~(bytes - 1)); unsignedlong size = stop - (unsignedlong)addr + (bytes - 1); unsignedlong i;
if (IS_ENABLED(CONFIG_PPC64))
mb(); /* sync */
for (i = 0; i < size >> shift; i++, addr += bytes)
dcbf(addr);
mb(); /* sync */
}
/* * Write any modified data cache blocks out to memory. * Does not invalidate the corresponding cache lines (especially for * any corresponding instruction cache).
*/ staticinlinevoid clean_dcache_range(unsignedlong start, unsignedlong stop)
{ unsignedlong shift = l1_dcache_shift(); unsignedlong bytes = l1_dcache_bytes(); void *addr = (void *)(start & ~(bytes - 1)); unsignedlong size = stop - (unsignedlong)addr + (bytes - 1); unsignedlong i;
for (i = 0; i < size >> shift; i++, addr += bytes)
dcbst(addr);
mb(); /* sync */
}
/* * Like above, but invalidate the D-cache. This is used by the 8xx * to invalidate the cache so the PPC core doesn't get stale data * from the CPM (no cache snooping here :-).
*/ staticinlinevoid invalidate_dcache_range(unsignedlong start, unsignedlong stop)
{ unsignedlong shift = l1_dcache_shift(); unsignedlong bytes = l1_dcache_bytes(); void *addr = (void *)(start & ~(bytes - 1)); unsignedlong size = stop - (unsignedlong)addr + (bytes - 1); unsignedlong i;
for (i = 0; i < size >> shift; i++, addr += bytes)
dcbi(addr);
mb(); /* sync */
}
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