1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright 2016 Joyent, Inc. 14 */ 15 16 17 #include <sys/types.h> 18 #include <sys/thread.h> 19 #include <sys/proc.h> 20 #include <sys/mman.h> 21 #include <sys/vmsystm.h> 22 #include <vm/as.h> 23 #include <vm/seg_umap.h> 24 25 #if !defined(__xpv) 26 #include <sys/comm_page.h> 27 #endif /* !defined(__xpv) */ 28 29 /* 30 * Map in the comm page. 31 * 32 * The contents of the comm page are only defined on non-xpv x86 at this time. 33 * Furthermore, the data is only valid in userspace (32-bit or 64-bit) when 34 * mapped from a 64-bit kernel. 35 * See: "uts/i86pc/sys/comm_page.h" 36 */ 37 caddr_t 38 comm_page_mapin() 39 { 40 #if !defined(__xpv) 41 proc_t *p = curproc; 42 caddr_t addr = NULL; 43 size_t len = COMM_PAGE_SIZE; 44 uint_t prot = PROT_USER | PROT_READ; 45 segumap_crargs_t suarg; 46 47 map_addr(&addr, len, (offset_t)0, 1, 0); 48 if (addr == NULL || valid_usr_range(addr, len, prot, p->p_as, 49 p->p_as->a_userlimit) != RANGE_OKAY) { 50 return (NULL); 51 } 52 53 suarg.kaddr = (caddr_t)&comm_page; 54 suarg.prot = suarg.maxprot = prot; 55 if (as_map(p->p_as, addr, len, segumap_create, &suarg) != 0) { 56 return (NULL); 57 } 58 return (addr); 59 #else /* !defined(__xpv) */ 60 return (NULL); 61 #endif /* !defined(__xpv) */ 62 } 63