diff options
Diffstat (limited to 'sys/uvm/uvm_glue.c')
| -rw-r--r-- | sys/uvm/uvm_glue.c | 39 |
1 files changed, 1 insertions, 38 deletions
diff --git a/sys/uvm/uvm_glue.c b/sys/uvm/uvm_glue.c index bd2bf466d6d..9098b232fbc 100644 --- a/sys/uvm/uvm_glue.c +++ b/sys/uvm/uvm_glue.c @@ -1,4 +1,4 @@ -/* $OpenBSD: uvm_glue.c,v 1.71 2017/02/14 10:31:15 mpi Exp $ */ +/* $OpenBSD: uvm_glue.c,v 1.72 2017/04/30 13:04:49 mpi Exp $ */ /* $NetBSD: uvm_glue.c,v 1.44 2001/02/06 19:54:44 eeh Exp $ */ /* @@ -100,43 +100,6 @@ uvm_kernacc(caddr_t addr, size_t len, int rw) return(rv); } -#ifdef KGDB -/* - * Change protections on kernel pages from addr to addr+len - * (presumably so debugger can plant a breakpoint). - * - * We force the protection change at the pmap level. If we were - * to use vm_map_protect a change to allow writing would be lazily- - * applied meaning we would still take a protection fault, something - * we really don't want to do. It would also fragment the kernel - * map unnecessarily. We cannot use pmap_protect since it also won't - * enforce a write-enable request. Using pmap_enter is the only way - * we can ensure the change takes place properly. - */ -void -uvm_chgkprot(caddr_t addr, size_t len, int rw) -{ - vm_prot_t prot; - paddr_t pa; - vaddr_t sva, eva; - - prot = rw == B_READ ? PROT_READ : PROT_READ | PROT_WRITE; - eva = round_page((vaddr_t)addr + len); - for (sva = trunc_page((vaddr_t)addr); sva < eva; sva += PAGE_SIZE) { - /* - * Extract physical address for the page. - * We use a cheezy hack to differentiate physical - * page 0 from an invalid mapping, not that it - * really matters... - */ - if (pmap_extract(pmap_kernel(), sva, &pa) == FALSE) - panic("chgkprot: invalid page"); - pmap_enter(pmap_kernel(), sva, pa, prot, PMAP_WIRED); - } - pmap_update(pmap_kernel()); -} -#endif - /* * uvm_vslock: wire user memory for I/O * |