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| author | Robert Morris <[email protected]> | 2020-10-05 06:59:33 -0400 |
|---|---|---|
| committer | Frans Kaashoek <[email protected]> | 2020-10-05 19:30:27 -0400 |
| commit | c61cc694137035c58c1d2439a4c44e0f924d41db (patch) | |
| tree | 9d8edd8bab973691b93b3e391fe3995e25c3ec7b /kernel/vm.c | |
| parent | 3092fe2c9ecf285cbf3c631b484c88fe5071224e (diff) | |
| download | xv6-labs-c61cc694137035c58c1d2439a4c44e0f924d41db.tar.gz xv6-labs-c61cc694137035c58c1d2439a4c44e0f924d41db.tar.bz2 xv6-labs-c61cc694137035c58c1d2439a4c44e0f924d41db.zip | |
eliminate virtio DMA into kernel stacks.
Diffstat (limited to 'kernel/vm.c')
| -rw-r--r-- | kernel/vm.c | 20 |
1 files changed, 0 insertions, 20 deletions
diff --git a/kernel/vm.c b/kernel/vm.c index 0809aea..c99d2a5 100644 --- a/kernel/vm.c +++ b/kernel/vm.c @@ -121,26 +121,6 @@ kvmmap(uint64 va, uint64 pa, uint64 sz, int perm) panic("kvmmap"); } -// translate a kernel virtual address to -// a physical address. only needed for -// addresses on the stack. -// assumes va is page aligned. -uint64 -kvmpa(uint64 va) -{ - uint64 off = va % PGSIZE; - pte_t *pte; - uint64 pa; - - pte = walk(kernel_pagetable, va, 0); - if(pte == 0) - panic("kvmpa"); - if((*pte & PTE_V) == 0) - panic("kvmpa"); - pa = PTE2PA(*pte); - return pa+off; -} - // Create PTEs for virtual addresses starting at va that refer to // physical addresses starting at pa. va and size might not // be page-aligned. Returns 0 on success, -1 if walk() couldn't |