| 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 | |