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physmem: Add physmem_excluded to query if a region is excluded

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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
This commit is contained in:
Warner Losh 2022-10-05 21:55:26 -06:00
parent ecb167daf7
commit deb1e3b719
2 changed files with 15 additions and 0 deletions
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14
sys/kern/subr_physmem.c
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@ -483,6 +483,20 @@ physmem_avail(vm_paddr_t *avail, size_t maxavail)
return (regions_to_avail(avail, EXFLAG_NOALLOC, maxavail, 0, NULL, NULL));
}
bool
physmem_excluded(vm_paddr_t pa, vm_size_t sz)
{
const struct region *exp;
size_t exi;
for (exi = 0, exp = exregions; exi < excnt; ++exi, ++exp) {
if (pa < exp->addr || pa + sz > exp->addr + exp->size)
continue;
return (true);
}
return (false);
}
#ifdef _KERNEL
/*
* Process all the regions added earlier into the global avail lists.

1
sys/sys/physmem.h
View File

@ -54,6 +54,7 @@ void physmem_exclude_region(vm_paddr_t pa, vm_size_t sz, uint32_t flags);
size_t physmem_avail(vm_paddr_t *avail, size_t maxavail);
void physmem_init_kernel_globals(void);
void physmem_print_tables(void);
bool physmem_excluded(vm_paddr_t pa, vm_size_t sz);
/*
* Convenience routines for FDT.