1 | /* $NetBSD: vga_post.c,v 1.18 2011/02/12 19:13:30 jmcneill Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 2007 Joerg Sonnenberger <joerg@NetBSD.org>. |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
14 | * notice, this list of conditions and the following disclaimer in |
15 | * the documentation and/or other materials provided with the |
16 | * distribution. |
17 | * |
18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
19 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
20 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
21 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
22 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
23 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, |
24 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
25 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
26 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
27 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
28 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
29 | * SUCH DAMAGE. |
30 | */ |
31 | |
32 | #include <sys/cdefs.h> |
33 | __KERNEL_RCSID(0, "$NetBSD: vga_post.c,v 1.18 2011/02/12 19:13:30 jmcneill Exp $" ); |
34 | |
35 | #include <sys/param.h> |
36 | #include <sys/device.h> |
37 | #include <sys/kmem.h> |
38 | #include <uvm/uvm.h> |
39 | #include <uvm/uvm_page.h> |
40 | |
41 | #include <machine/pio.h> |
42 | |
43 | #include <x86/vga_post.h> |
44 | |
45 | #include <x86emu/x86emu.h> |
46 | #include <x86emu/x86emu_i8254.h> |
47 | #include <x86emu/x86emu_regs.h> |
48 | |
49 | #include "opt_ddb.h" |
50 | |
51 | #define BASE_MEMORY 65536 /* How much memory to allocate in Real Mode */ |
52 | |
53 | struct vga_post { |
54 | struct X86EMU emu; |
55 | vaddr_t sys_image; |
56 | uint32_t initial_eax; |
57 | struct x86emu_i8254 i8254; |
58 | uint8_t bios_data[PAGE_SIZE]; |
59 | struct pglist ram_backing; |
60 | }; |
61 | |
62 | #ifdef DDB |
63 | static struct vga_post *ddb_vgapostp; |
64 | void ddb_vgapost(void); |
65 | #endif |
66 | |
67 | static uint8_t |
68 | vm86_emu_inb(struct X86EMU *emu, uint16_t port) |
69 | { |
70 | struct vga_post *sc = emu->sys_private; |
71 | |
72 | if (port == 0xb2) /* APM scratch register */ |
73 | return 0; |
74 | |
75 | if (port >= 0x80 && port < 0x88) /* POST status register */ |
76 | return 0; |
77 | |
78 | if (x86emu_i8254_claim_port(&sc->i8254, port) && 0) { |
79 | return x86emu_i8254_inb(&sc->i8254, port); |
80 | } else |
81 | return inb(port); |
82 | } |
83 | |
84 | static uint16_t |
85 | vm86_emu_inw(struct X86EMU *emu, uint16_t port) |
86 | { |
87 | if (port >= 0x80 && port < 0x88) /* POST status register */ |
88 | return 0; |
89 | |
90 | return inw(port); |
91 | } |
92 | |
93 | static uint32_t |
94 | vm86_emu_inl(struct X86EMU *emu, uint16_t port) |
95 | { |
96 | if (port >= 0x80 && port < 0x88) /* POST status register */ |
97 | return 0; |
98 | |
99 | return inl(port); |
100 | } |
101 | |
102 | static void |
103 | vm86_emu_outb(struct X86EMU *emu, uint16_t port, uint8_t val) |
104 | { |
105 | struct vga_post *sc = emu->sys_private; |
106 | |
107 | if (port == 0xb2) /* APM scratch register */ |
108 | return; |
109 | |
110 | if (port >= 0x80 && port < 0x88) /* POST status register */ |
111 | return; |
112 | |
113 | if (x86emu_i8254_claim_port(&sc->i8254, port) && 0) { |
114 | x86emu_i8254_outb(&sc->i8254, port, val); |
115 | } else |
116 | outb(port, val); |
117 | } |
118 | |
119 | static void |
120 | vm86_emu_outw(struct X86EMU *emu, uint16_t port, uint16_t val) |
121 | { |
122 | if (port >= 0x80 && port < 0x88) /* POST status register */ |
123 | return; |
124 | |
125 | outw(port, val); |
126 | } |
127 | |
128 | static void |
129 | vm86_emu_outl(struct X86EMU *emu, uint16_t port, uint32_t val) |
130 | { |
131 | if (port >= 0x80 && port < 0x88) /* POST status register */ |
132 | return; |
133 | |
134 | outl(port, val); |
135 | } |
136 | |
137 | struct vga_post * |
138 | vga_post_init(int bus, int device, int function) |
139 | { |
140 | struct vga_post *sc; |
141 | vaddr_t iter; |
142 | struct vm_page *pg; |
143 | vaddr_t sys_image, sys_bios_data; |
144 | int err; |
145 | |
146 | sys_image = uvm_km_alloc(kernel_map, 1024 * 1024, 0, UVM_KMF_VAONLY); |
147 | if (sys_image == 0) { |
148 | return NULL; |
149 | } |
150 | sc = kmem_alloc(sizeof(*sc), KM_SLEEP); |
151 | sc->sys_image = sys_image; |
152 | sc->emu.sys_private = sc; |
153 | |
154 | err = uvm_pglistalloc(BASE_MEMORY, 0, (paddr_t)-1, 0, 0, |
155 | &sc->ram_backing, BASE_MEMORY/PAGE_SIZE, 1); |
156 | if (err) { |
157 | uvm_km_free(kernel_map, sc->sys_image, |
158 | 1024 * 1024, UVM_KMF_VAONLY); |
159 | kmem_free(sc, sizeof(*sc)); |
160 | return NULL; |
161 | } |
162 | |
163 | /* |
164 | * Map and copy BIOS data. |
165 | */ |
166 | sys_bios_data = uvm_km_alloc(kernel_map, PAGE_SIZE, 0, UVM_KMF_VAONLY); |
167 | if (sys_bios_data == 0) { |
168 | return NULL; |
169 | } |
170 | pmap_kenter_pa(sys_bios_data, 0, VM_PROT_READ, 0); |
171 | pmap_update(pmap_kernel()); |
172 | |
173 | memcpy((void *)sc->bios_data, (void *)sys_bios_data, PAGE_SIZE); |
174 | |
175 | pmap_kremove(sys_bios_data, PAGE_SIZE); |
176 | pmap_update(pmap_kernel()); |
177 | uvm_km_free(kernel_map, sys_bios_data, PAGE_SIZE, UVM_KMF_VAONLY); |
178 | |
179 | /* |
180 | * Map 0 .. 64KB and 640KB .. 1MB ranges. |
181 | */ |
182 | iter = 0; |
183 | TAILQ_FOREACH(pg, &sc->ram_backing, pageq.queue) { |
184 | pmap_kenter_pa(sc->sys_image + iter, VM_PAGE_TO_PHYS(pg), |
185 | VM_PROT_READ | VM_PROT_WRITE, 0); |
186 | iter += PAGE_SIZE; |
187 | } |
188 | KASSERT(iter == BASE_MEMORY); |
189 | |
190 | for (iter = 640 * 1024; iter < 1024 * 1024; iter += PAGE_SIZE) { |
191 | pmap_kenter_pa(sc->sys_image + iter, iter, |
192 | VM_PROT_READ | VM_PROT_WRITE, 0); |
193 | } |
194 | pmap_update(pmap_kernel()); |
195 | |
196 | memset(&sc->emu, 0, sizeof(sc->emu)); |
197 | X86EMU_init_default(&sc->emu); |
198 | sc->emu.emu_inb = vm86_emu_inb; |
199 | sc->emu.emu_inw = vm86_emu_inw; |
200 | sc->emu.emu_inl = vm86_emu_inl; |
201 | sc->emu.emu_outb = vm86_emu_outb; |
202 | sc->emu.emu_outw = vm86_emu_outw; |
203 | sc->emu.emu_outl = vm86_emu_outl; |
204 | |
205 | sc->emu.mem_base = (char *)sc->sys_image; |
206 | sc->emu.mem_size = 1024 * 1024; |
207 | |
208 | sc->initial_eax = bus * 256 + device * 8 + function; |
209 | #ifdef DDB |
210 | ddb_vgapostp = sc; |
211 | #endif |
212 | return sc; |
213 | } |
214 | |
215 | void |
216 | vga_post_call(struct vga_post *sc) |
217 | { |
218 | sc->emu.x86.R_EAX = sc->initial_eax; |
219 | sc->emu.x86.R_EDX = 0x00000080; |
220 | sc->emu.x86.R_DS = 0x0040; |
221 | sc->emu.x86.register_flags = 0x3200; |
222 | |
223 | memcpy((void *)sc->sys_image, sc->bios_data, PAGE_SIZE); |
224 | |
225 | /* stack is at the end of the first 64KB */ |
226 | sc->emu.x86.R_SS = 0; |
227 | sc->emu.x86.R_ESP = 0; |
228 | |
229 | x86emu_i8254_init(&sc->i8254, nanotime); |
230 | |
231 | /* Jump straight into the VGA BIOS POST code */ |
232 | X86EMU_exec_call(&sc->emu, 0xc000, 0x0003); |
233 | } |
234 | |
235 | void |
236 | vga_post_set_vbe(struct vga_post *sc, uint16_t vbemode) |
237 | { |
238 | sc->emu.x86.R_EAX = sc->initial_eax; |
239 | sc->emu.x86.R_EDX = 0x00000080; |
240 | sc->emu.x86.R_DS = 0x0040; |
241 | sc->emu.x86.register_flags = 0x3200; |
242 | |
243 | memcpy((void *)sc->sys_image, sc->bios_data, PAGE_SIZE); |
244 | |
245 | /* stack is at the end of the first 64KB */ |
246 | sc->emu.x86.R_SS = 0; |
247 | sc->emu.x86.R_ESP = 0; |
248 | |
249 | x86emu_i8254_init(&sc->i8254, nanotime); |
250 | |
251 | sc->emu.x86.R_EBX = vbemode | 0x4000; |
252 | sc->emu.x86.R_EAX = 0x4f02; |
253 | X86EMU_exec_intr(&sc->emu, 0x10); |
254 | } |
255 | |
256 | void |
257 | vga_post_free(struct vga_post *sc) |
258 | { |
259 | |
260 | uvm_pglistfree(&sc->ram_backing); |
261 | pmap_kremove(sc->sys_image, 1024 * 1024); |
262 | pmap_update(pmap_kernel()); |
263 | uvm_km_free(kernel_map, sc->sys_image, 1024 * 1024, UVM_KMF_VAONLY); |
264 | kmem_free(sc, sizeof(*sc)); |
265 | } |
266 | |
267 | #ifdef DDB |
268 | void |
269 | ddb_vgapost(void) |
270 | { |
271 | |
272 | if (ddb_vgapostp) |
273 | vga_post_call(ddb_vgapostp); |
274 | else |
275 | printf("ddb_vgapost: vga_post not initialized\n" ); |
276 | } |
277 | #endif |
278 | |