1 /* $OpenBSD: vga_post.c,v 1.9 2015/09/01 06:01:24 deraadt Exp $ */ 2 /* $NetBSD: vga_post.c,v 1.12 2009/03/15 21:32:36 cegger Exp $ */ 3 4 /*- 5 * Copyright (c) 2007 Joerg Sonnenberger <joerg@NetBSD.org>. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 23 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 27 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 29 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/device.h> 35 #include <sys/malloc.h> 36 37 #include <uvm/uvm_extern.h> 38 39 #include <machine/pio.h> 40 #include <machine/vga_post.h> 41 42 #include <dev/x86emu/x86emu.h> 43 #include <dev/x86emu/x86emu_regs.h> 44 45 #define BASE_MEMORY 65536 /* How much memory to allocate in Real Mode */ 46 47 struct vga_post { 48 struct x86emu emu; 49 vaddr_t sys_image; 50 uint32_t initial_eax; 51 uint8_t bios_data[PAGE_SIZE]; 52 struct pglist ram_backing; 53 }; 54 55 #ifdef DDB 56 struct vga_post *ddb_vgapostp; 57 void ddb_vgapost(void); 58 #endif 59 60 static uint8_t 61 vm86_emu_inb(struct x86emu *emu, uint16_t port) 62 { 63 if (port == 0xb2) /* APM scratch register */ 64 return 0; 65 66 if (port >= 0x80 && port < 0x88) /* POST status register */ 67 return 0; 68 69 return inb(port); 70 } 71 72 static uint16_t 73 vm86_emu_inw(struct x86emu *emu, uint16_t port) 74 { 75 if (port >= 0x80 && port < 0x88) /* POST status register */ 76 return 0; 77 78 return inw(port); 79 } 80 81 static uint32_t 82 vm86_emu_inl(struct x86emu *emu, uint16_t port) 83 { 84 if (port >= 0x80 && port < 0x88) /* POST status register */ 85 return 0; 86 87 return inl(port); 88 } 89 90 static void 91 vm86_emu_outb(struct x86emu *emu, uint16_t port, uint8_t val) 92 { 93 if (port == 0xb2) /* APM scratch register */ 94 return; 95 96 if (port >= 0x80 && port < 0x88) /* POST status register */ 97 return; 98 99 outb(port, val); 100 } 101 102 static void 103 vm86_emu_outw(struct x86emu *emu, uint16_t port, uint16_t val) 104 { 105 if (port >= 0x80 && port < 0x88) /* POST status register */ 106 return; 107 108 outw(port, val); 109 } 110 111 static void 112 vm86_emu_outl(struct x86emu *emu, uint16_t port, uint32_t val) 113 { 114 if (port >= 0x80 && port < 0x88) /* POST status register */ 115 return; 116 117 outl(port, val); 118 } 119 120 struct vga_post * 121 vga_post_init(int bus, int device, int function) 122 { 123 struct vga_post *sc; 124 vaddr_t iter; 125 struct vm_page *pg; 126 vaddr_t sys_image, sys_bios_data; 127 int err; 128 129 sys_bios_data = uvm_km_valloc(kernel_map, PAGE_SIZE); 130 if (sys_bios_data == 0) 131 return NULL; 132 133 sys_image = uvm_km_valloc(kernel_map, 1024 * 1024); 134 if (sys_image == 0) { 135 uvm_km_free(kernel_map, sys_bios_data, PAGE_SIZE); 136 return NULL; 137 } 138 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 139 140 TAILQ_INIT(&sc->ram_backing); 141 err = uvm_pglistalloc(BASE_MEMORY, 0, (paddr_t)-1, 0, 0, 142 &sc->ram_backing, BASE_MEMORY/PAGE_SIZE, UVM_PLA_WAITOK); 143 if (err) { 144 uvm_km_free(kernel_map, sc->sys_image, 1024 * 1024); 145 free(sc, M_DEVBUF, sizeof *sc); 146 return NULL; 147 } 148 149 sc->sys_image = sys_image; 150 sc->emu.sys_private = sc; 151 152 pmap_kenter_pa(sys_bios_data, 0, PROT_READ); 153 pmap_update(pmap_kernel()); 154 memcpy((void *)sc->bios_data, (void *)sys_bios_data, PAGE_SIZE); 155 pmap_kremove(sys_bios_data, PAGE_SIZE); 156 uvm_km_free(kernel_map, sys_bios_data, PAGE_SIZE); 157 158 iter = 0; 159 TAILQ_FOREACH(pg, &sc->ram_backing, pageq) { 160 pmap_kenter_pa(sc->sys_image + iter, VM_PAGE_TO_PHYS(pg), 161 PROT_READ | PROT_WRITE); 162 iter += PAGE_SIZE; 163 } 164 KASSERT(iter == BASE_MEMORY); 165 166 for (iter = 640 * 1024; iter < 1024 * 1024; iter += PAGE_SIZE) 167 pmap_kenter_pa(sc->sys_image + iter, iter, 168 PROT_READ | PROT_WRITE); 169 pmap_update(pmap_kernel()); 170 171 memset(&sc->emu, 0, sizeof(sc->emu)); 172 x86emu_init_default(&sc->emu); 173 sc->emu.emu_inb = vm86_emu_inb; 174 sc->emu.emu_inw = vm86_emu_inw; 175 sc->emu.emu_inl = vm86_emu_inl; 176 sc->emu.emu_outb = vm86_emu_outb; 177 sc->emu.emu_outw = vm86_emu_outw; 178 sc->emu.emu_outl = vm86_emu_outl; 179 180 sc->emu.mem_base = (char *)sc->sys_image; 181 sc->emu.mem_size = 1024 * 1024; 182 183 sc->initial_eax = bus * 256 + device * 8 + function; 184 #ifdef DDB 185 ddb_vgapostp = sc; 186 #endif 187 return sc; 188 } 189 190 void 191 vga_post_call(struct vga_post *sc) 192 { 193 sc->emu.x86.R_EAX = sc->initial_eax; 194 sc->emu.x86.R_EDX = 0x00000080; 195 sc->emu.x86.R_DS = 0x0040; 196 sc->emu.x86.register_flags = 0x3200; 197 198 memcpy((void *)sc->sys_image, sc->bios_data, PAGE_SIZE); 199 200 /* stack is at the end of the first 64KB */ 201 sc->emu.x86.R_SS = 0; 202 sc->emu.x86.R_ESP = 0; 203 204 /* Jump straight into the VGA BIOS POST code */ 205 x86emu_exec_call(&sc->emu, 0xc000, 0x0003); 206 } 207 208 void 209 vga_post_free(struct vga_post *sc) 210 { 211 uvm_pglistfree(&sc->ram_backing); 212 pmap_kremove(sc->sys_image, 1024 * 1024); 213 214 uvm_km_free(kernel_map, sc->sys_image, 1024 * 1024); 215 pmap_update(pmap_kernel()); 216 free(sc, M_DEVBUF, sizeof *sc); 217 } 218 219 #ifdef DDB 220 void 221 ddb_vgapost(void) 222 { 223 224 if (ddb_vgapostp) 225 vga_post_call(ddb_vgapostp); 226 else 227 printf("ddb_vgapost: vga_post not initialized\n"); 228 } 229 #endif 230