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vm: allow pages to be mapped as no-cache

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This commit is contained in:
max 🍓
2023-07-08 15:53:06 +01:00
parent 8ffbacb0cd
commit d96c549f17
2 changed files with 11 additions and 6 deletions
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6
arch/x86_64/pmap.c
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@@ -71,6 +71,10 @@ static pte_t make_pte(pfn_t pfn, enum vm_prot prot, enum page_size size)
v |= PTE_RW; v |= PTE_RW;
} }
if (prot & VM_PROT_NOCACHE) {
v |= PTE_NOCACHE;
}
if (!(prot & VM_PROT_EXEC)) { if (!(prot & VM_PROT_EXEC)) {
v |= PTE_NX; v |= PTE_NX;
} }
@@ -267,7 +271,7 @@ void pmap_bootstrap(void)
do_pmap_add(kernel_pmap, do_pmap_add(kernel_pmap,
(void *)(vbase + i), (void *)(vbase + i),
PFN(i), PFN(i),
VM_PROT_READ | VM_PROT_WRITE | VM_PROT_SVR, hugepage); VM_PROT_READ | VM_PROT_WRITE | VM_PROT_SVR | VM_PROT_NOCACHE, hugepage);
} }
pmap_switch(kernel_pmap); pmap_switch(kernel_pmap);

1
include/socks/vm.h
View File

@@ -47,6 +47,7 @@ enum vm_prot {
VM_PROT_EXEC = 0x04u, VM_PROT_EXEC = 0x04u,
VM_PROT_USER = 0x08u, VM_PROT_USER = 0x08u,
VM_PROT_SVR = 0x10u, VM_PROT_SVR = 0x10u,
VM_PROT_NOCACHE = 0x20u,
}; };
enum vm_flags { enum vm_flags {