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efi: avoid hard-coding the various PAT constants
This makes the code much easier to understand, and avoids problems if Xen's PAT ever changes in the future. Signed-off-by: Demi Marie Obenour <demi@invisiblethingslab.com> Reviewed-by: Jan Beulich <jbeulich@suse.com>
This commit is contained in:
Demi Marie Obenour authored and Jan Beulich committed
1 parent
1ca8af08df
commit
32b61bcafc
1 file changed
+6
-6
@@ -1724,23 +1724,23 @@ void __init efi_init_memory(void)
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emfn = PFN_UP(desc->PhysicalStart + len);
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if ( desc->Attribute & EFI_MEMORY_WB )
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/* nothing */;
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prot |= _PAGE_WB;
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else if ( desc->Attribute & EFI_MEMORY_WT )
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prot |= _PAGE_PWT | MAP_SMALL_PAGES;
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prot |= _PAGE_WT | MAP_SMALL_PAGES;
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else if ( desc->Attribute & EFI_MEMORY_WC )
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prot |= _PAGE_PAT | MAP_SMALL_PAGES;
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prot |= _PAGE_WC | MAP_SMALL_PAGES;
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else if ( desc->Attribute & (EFI_MEMORY_UC | EFI_MEMORY_UCE) )
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prot |= _PAGE_PWT | _PAGE_PCD | MAP_SMALL_PAGES;
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prot |= _PAGE_UC | MAP_SMALL_PAGES;
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else if ( efi_bs_revision >= EFI_REVISION(2, 5) &&
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(desc->Attribute & EFI_MEMORY_WP) )
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prot |= _PAGE_PAT | _PAGE_PWT | MAP_SMALL_PAGES;
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prot |= _PAGE_WP | MAP_SMALL_PAGES;
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else
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{
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printk(XENLOG_ERR "Unknown cachability for MFNs %#lx-%#lx%s\n",
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smfn, emfn - 1, efi_map_uc ? ", assuming UC" : "");
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if ( !efi_map_uc )
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continue;
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prot |= _PAGE_PWT | _PAGE_PCD | MAP_SMALL_PAGES;
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prot |= _PAGE_UC | MAP_SMALL_PAGES;
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}
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if ( desc->Attribute & (efi_bs_revision < EFI_REVISION(2, 5)
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