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238190 |
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07-Jul-2012 |
marcel |
Implement ia64_physmem_alloc() and use it consistently to get memory before VM has been initialized. This includes: 1. Replacing pmap_steal_memory(), 2. Replace the handcrafted logic to allocate a naturally aligned VHPT, 3. Properly allocate the DPCPU for the BSP.
Ad 3: Appending the DPCPU to kernend worked as long as we wouldn't cross into the next PBVM page. If we were to cross into the next page, then there wouldn't be a PTE entry on the page table for it and we would end up with a MCA following a page fault. As such, this commit fixes MCAs occasionally seen.
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238184 |
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07-Jul-2012 |
marcel |
Hide the creation of phys_avail behind an API to make it easier to do it correctly. We now iterate the EFI memory descriptors once and collect all the information in a single pass. This includes: 1. The I/O port base address, 2. The PAL memory region. Have the physmem API track this. 3. Memory descriptors of memory we can't use, like bad memory, runtime services code & data, etc. Have the physmem API track these. 4. memory descriptors of memory we can use or re-use, such as free memory, boot time services code & data, loader code & data, etc. These are added by the physmem API.
Since the PBVM page table and pages are in memory described as loader data, inform the physmem API of chunks that need to be delated from the available physical memory.
While here, remove Maxmem and replace it with the better named paddr_max. Maxmem was defined as physmem, which is generally wrong. Now, paddr_max is properly defined as the largesty physical address.
The upshot of all this is that: 1. We properly determine realmem. 2. We maximize physmem by re-using memory where possible. 3. We remove complexity from ia64_init() in machdep.c. 4. Remove confusion about realmem, physmem & Maxmem.
The new ia64_physmem_alloc() is to replace pmap_steal_memory() in pmap.c, as well as replace the handcrafted allocation of the VHPT for the BSP in pmap_bootstrap() in pmap.c. This is step 2 and addresses the manipulation of phys_avail after it is being created.
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