Support pmap_extract_and_hold on arm64 stage 2 mappings
Sponsored by: Innovate UK Differential Revision: https://reviews.freebsd.org/D24469
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=362284
@ -1228,8 +1228,7 @@ pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot)
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vm_offset_t off;
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vm_page_t m;
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int lvl;
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PMAP_ASSERT_STAGE1(pmap);
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bool use;
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m = NULL;
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PMAP_LOCK(pmap);
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@ -1244,8 +1243,19 @@ pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot)
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(lvl < 3 && (tpte & ATTR_DESCR_MASK) == L1_BLOCK),
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("pmap_extract_and_hold: Invalid pte at L%d: %lx", lvl,
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tpte & ATTR_DESCR_MASK));
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if (((tpte & ATTR_S1_AP_RW_BIT) == ATTR_S1_AP(ATTR_S1_AP_RW)) ||
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((prot & VM_PROT_WRITE) == 0)) {
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use = false;
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if ((prot & VM_PROT_WRITE) == 0)
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use = true;
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else if (pmap->pm_stage == PM_STAGE1 &&
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(tpte & ATTR_S1_AP_RW_BIT) == ATTR_S1_AP(ATTR_S1_AP_RW))
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use = true;
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else if (pmap->pm_stage == PM_STAGE2 &&
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((tpte & ATTR_S2_S2AP(ATTR_S2_S2AP_WRITE)) ==
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ATTR_S2_S2AP(ATTR_S2_S2AP_WRITE)))
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use = true;
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if (use) {
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switch(lvl) {
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case 1:
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off = va & L1_OFFSET;
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