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Work around problems that happen when there is ram at the end of the

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physical address space.
This commit is contained in:
Ian Lepore 2016-01-02 22:31:14 +00:00
parent 76cbcfdcfc
commit 95181ed7ff
1 changed files with 14 additions and 0 deletions
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14
sys/arm/arm/physmem.c
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@ -280,10 +280,24 @@ arm_physmem_hardware_region(vm_paddr_t pa, vm_size_t sz)
/*
* Filter out the page at PA 0x00000000. The VM can't handle it, as
* pmap_extract() == 0 means failure.
*
* Also filter out the page at the end of the physical address space --
* if addr is non-zero and addr+size is zero that means we wrapped to
* the next byte beyond what vm_paddr_t can express. The calculations
* in vm_page_startup() are going to have the same problem, so just work
* around it by leaving the last page out.
*
* XXX This just in: subtract out a whole megabyte, not just 1 page.
* Reducing the size by anything less than 1MB results in a NULL pointer
* deref in _vm_map_lock_read() very early in startup. Better to give
* up a whole megabyte than leave some folks with an unusable system
* while we investigate.
*/
if (pa == 0) {
pa = PAGE_SIZE;
sz -= PAGE_SIZE;
} else if (pa + sz == 0) {
sz -= 1024 * 1024;
}
/*