physmem: Add physmem_excluded to query if a region is excluded
In order to safely reuse excluded memory when it's reserved for special purpose, we need to test whether or not the memory has been reserved early in boot. physmem_excluded will return true when the entire range is excluded, false otherwise. Sponsored by: Netflix
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@ -483,6 +483,20 @@ physmem_avail(vm_paddr_t *avail, size_t maxavail)
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return (regions_to_avail(avail, EXFLAG_NOALLOC, maxavail, 0, NULL, NULL));
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}
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bool
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physmem_excluded(vm_paddr_t pa, vm_size_t sz)
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{
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const struct region *exp;
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size_t exi;
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for (exi = 0, exp = exregions; exi < excnt; ++exi, ++exp) {
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if (pa < exp->addr || pa + sz > exp->addr + exp->size)
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continue;
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return (true);
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}
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return (false);
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}
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#ifdef _KERNEL
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/*
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* Process all the regions added earlier into the global avail lists.
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@ -54,6 +54,7 @@ void physmem_exclude_region(vm_paddr_t pa, vm_size_t sz, uint32_t flags);
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size_t physmem_avail(vm_paddr_t *avail, size_t maxavail);
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void physmem_init_kernel_globals(void);
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void physmem_print_tables(void);
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bool physmem_excluded(vm_paddr_t pa, vm_size_t sz);
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/*
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* Convenience routines for FDT.
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