1 /* $NetBSD: efi_machdep.c,v 1.4 2023/07/10 07:00:12 rin Exp $ */
2
3 /*-
4 * Copyright (c) 2018 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jared McNeill <jmcneill@invisible.ca> and Nick Hudson
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: efi_machdep.c,v 1.4 2023/07/10 07:00:12 rin Exp $");
34
35 #include <sys/param.h>
36
37 #include <uvm/uvm_extern.h>
38
39 #include <arm/efirt.h>
40 #include <arm/vfpreg.h>
41
42 #include <arm/arm/efi_runtime.h>
43
44 #include <arm/arm32/machdep.h>
45
46 static struct {
47 struct faultbuf aert_faultbuf;
48 uint32_t aert_tpidrprw;
49 uint32_t aert_fpexc;
50 } arm_efirt_state;
51
52 int
arm_efirt_md_enter(void)53 arm_efirt_md_enter(void)
54 {
55 kpreempt_disable();
56
57 struct lwp * const l = curlwp;
58
59 arm_efirt_state.aert_tpidrprw = armreg_tpidrprw_read();
60
61 /* Disable the VFP. */
62 arm_efirt_state.aert_fpexc = armreg_fpexc_read();
63 armreg_fpexc_write(arm_efirt_state.aert_fpexc & ~VFP_FPEXC_EN);
64 isb();
65
66 /*
67 * Install custom fault handler. EFI lock is held across calls so
68 * shared faultbuf is safe here.
69 */
70 int err = cpu_set_onfault(&arm_efirt_state.aert_faultbuf);
71 if (err)
72 return err;
73
74 if ((l->l_flag & LW_SYSTEM) == 0) {
75 pmap_deactivate(l);
76 }
77 pmap_activate_efirt();
78
79 return 0;
80 }
81
82 void
arm_efirt_md_exit(void)83 arm_efirt_md_exit(void)
84 {
85 struct lwp * const l = curlwp;
86
87 pmap_deactivate_efirt();
88 if ((l->l_flag & LW_SYSTEM) == 0) {
89 pmap_activate(l);
90 }
91
92 armreg_tpidrprw_write(arm_efirt_state.aert_tpidrprw);
93
94 /* Restore FP access (if it existed) */
95 armreg_fpexc_write(arm_efirt_state.aert_fpexc);
96 isb();
97
98 /* Remove custom fault handler */
99 cpu_unset_onfault();
100
101 kpreempt_enable();
102 }
103
104
105 void
cpu_efirt_map_range(vaddr_t va,paddr_t pa,size_t sz,enum cpu_efirt_mem_type type)106 cpu_efirt_map_range(vaddr_t va, paddr_t pa, size_t sz,
107 enum cpu_efirt_mem_type type)
108 {
109 int flags = 0;
110 int prot = 0;
111
112 switch (type) {
113 case ARM_EFIRT_MEM_CODE:
114 /* need write permission because fw devs */
115 prot = VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE;
116 flags = prot;
117 break;
118 case ARM_EFIRT_MEM_DATA:
119 prot = VM_PROT_READ | VM_PROT_WRITE;
120 flags = prot;
121 break;
122 case ARM_EFIRT_MEM_MMIO:
123 prot = VM_PROT_READ | VM_PROT_WRITE;
124 flags = prot | PMAP_DEV;
125 break;
126 default:
127 panic("%s: unsupported type %d", __func__, type);
128 }
129 if (va >= VM_MAXUSER_ADDRESS || va >= VM_MAXUSER_ADDRESS - sz) {
130 printf("Incorrect EFI mapping range %" PRIxVADDR
131 "- %" PRIxVADDR "\n", va, va + sz);
132 }
133
134 while (sz != 0) {
135 pmap_enter(pmap_efirt(), va, pa, prot, flags | PMAP_WIRED);
136 va += PAGE_SIZE;
137 pa += PAGE_SIZE;
138 sz -= PAGE_SIZE;
139 }
140 pmap_update(pmap_efirt());
141 }
142