Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 1 | // 32bit code to Power On Self Test (POST) a machine. |
| 2 | // |
| 3 | // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net> |
| 4 | // Copyright (C) 2002 MandrakeSoft S.A. |
| 5 | // |
| 6 | // This file may be distributed under the terms of the GNU GPLv3 license. |
| 7 | |
| 8 | #include "ioport.h" // PORT_* |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 9 | #include "config.h" // CONFIG_* |
| 10 | #include "cmos.h" // CMOS_* |
| 11 | #include "util.h" // memset |
| 12 | #include "biosvar.h" // struct bios_data_area_s |
Kevin O'Connor | 2ad3744 | 2008-05-06 19:49:01 -0400 | [diff] [blame] | 13 | #include "ata.h" // hard_drive_setup |
Kevin O'Connor | 3bbcc14 | 2008-04-13 17:07:33 -0400 | [diff] [blame] | 14 | #include "disk.h" // floppy_drive_setup |
Kevin O'Connor | c781293 | 2008-06-08 23:08:12 -0400 | [diff] [blame] | 15 | #include "memmap.h" // add_e820 |
Kevin O'Connor | f54c150 | 2008-06-14 15:56:16 -0400 | [diff] [blame] | 16 | #include "pic.h" // pic_setup |
Kevin O'Connor | 0525d29 | 2008-07-04 06:18:30 -0400 | [diff] [blame] | 17 | #include "pci.h" // create_pirtable |
| 18 | #include "acpi.h" // acpi_bios_init |
Kevin O'Connor | 9521e26 | 2008-07-04 13:04:29 -0400 | [diff] [blame] | 19 | #include "bregs.h" // struct bregs |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 20 | |
Kevin O'Connor | 438f635 | 2008-03-30 21:46:53 -0400 | [diff] [blame] | 21 | #define bda ((struct bios_data_area_s *)MAKE_FARPTR(SEG_BDA, 0)) |
| 22 | #define ebda ((struct extended_bios_data_area_s *)MAKE_FARPTR(SEG_EBDA, 0)) |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 23 | |
| 24 | static void |
Kevin O'Connor | 2fda7cb | 2008-07-05 20:41:53 -0400 | [diff] [blame] | 25 | set_irq(int vector, void *loc) |
Kevin O'Connor | e3677b1 | 2008-07-04 15:29:23 -0400 | [diff] [blame] | 26 | { |
| 27 | SET_BDA(ivecs[vector].seg, SEG_BIOS); |
Kevin O'Connor | 2fda7cb | 2008-07-05 20:41:53 -0400 | [diff] [blame] | 28 | SET_BDA(ivecs[vector].offset, (u32)loc - BUILD_BIOS_ADDR); |
Kevin O'Connor | e3677b1 | 2008-07-04 15:29:23 -0400 | [diff] [blame] | 29 | } |
| 30 | |
Kevin O'Connor | 2fda7cb | 2008-07-05 20:41:53 -0400 | [diff] [blame] | 31 | // Symbols defined in romlayout.S |
| 32 | extern void dummy_iret_handler(); |
| 33 | extern void entry_08(); |
| 34 | extern void entry_09(); |
| 35 | extern void entry_hwirq(); |
| 36 | extern void entry_0e(); |
| 37 | extern void entry_10(); |
| 38 | extern void entry_11(); |
| 39 | extern void entry_12(); |
| 40 | extern void entry_13(); |
| 41 | extern void entry_14(); |
| 42 | extern void entry_15(); |
| 43 | extern void entry_16(); |
| 44 | extern void entry_17(); |
| 45 | extern void entry_18(); |
| 46 | extern void entry_19(); |
| 47 | extern void entry_1a(); |
| 48 | extern void entry_1c(); |
| 49 | extern void entry_40(); |
| 50 | extern void entry_70(); |
| 51 | extern void entry_74(); |
| 52 | extern void entry_75(); |
| 53 | extern void entry_76(); |
| 54 | |
Kevin O'Connor | e3677b1 | 2008-07-04 15:29:23 -0400 | [diff] [blame] | 55 | static void |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 56 | init_bda() |
| 57 | { |
Kevin O'Connor | 35192dd | 2008-06-08 19:18:33 -0400 | [diff] [blame] | 58 | dprintf(3, "init bda\n"); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 59 | memset(bda, 0, sizeof(*bda)); |
| 60 | |
Kevin O'Connor | f54c150 | 2008-06-14 15:56:16 -0400 | [diff] [blame] | 61 | SET_BDA(mem_size_kb, BASE_MEM_IN_K); |
| 62 | |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 63 | int i; |
Kevin O'Connor | e3677b1 | 2008-07-04 15:29:23 -0400 | [diff] [blame] | 64 | for (i=0; i<256; i++) |
Kevin O'Connor | 2fda7cb | 2008-07-05 20:41:53 -0400 | [diff] [blame] | 65 | set_irq(i, &dummy_iret_handler); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 66 | |
Kevin O'Connor | 2fda7cb | 2008-07-05 20:41:53 -0400 | [diff] [blame] | 67 | set_irq(0x08, &entry_08); |
| 68 | set_irq(0x09, &entry_09); |
| 69 | //set_irq(0x0a, &entry_hwirq); |
| 70 | //set_irq(0x0b, &entry_hwirq); |
| 71 | //set_irq(0x0c, &entry_hwirq); |
| 72 | //set_irq(0x0d, &entry_hwirq); |
| 73 | set_irq(0x0e, &entry_0e); |
| 74 | //set_irq(0x0f, &entry_hwirq); |
| 75 | set_irq(0x10, &entry_10); |
| 76 | set_irq(0x11, &entry_11); |
| 77 | set_irq(0x12, &entry_12); |
| 78 | set_irq(0x13, &entry_13); |
| 79 | set_irq(0x14, &entry_14); |
| 80 | set_irq(0x15, &entry_15); |
| 81 | set_irq(0x16, &entry_16); |
| 82 | set_irq(0x17, &entry_17); |
| 83 | set_irq(0x18, &entry_18); |
| 84 | set_irq(0x19, &entry_19); |
| 85 | set_irq(0x1a, &entry_1a); |
| 86 | set_irq(0x1c, &entry_1c); |
| 87 | set_irq(0x40, &entry_40); |
| 88 | set_irq(0x70, &entry_70); |
| 89 | //set_irq(0x71, &entry_hwirq); |
| 90 | //set_irq(0x72, &entry_hwirq); |
| 91 | //set_irq(0x73, &entry_hwirq); |
| 92 | set_irq(0x74, &entry_74); |
| 93 | set_irq(0x75, &entry_75); |
| 94 | set_irq(0x76, &entry_76); |
| 95 | //set_irq(0x77, &entry_hwirq); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 96 | |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 97 | // set vector 0x79 to zero |
| 98 | // this is used by 'gardian angel' protection system |
Kevin O'Connor | e906149 | 2008-03-11 21:54:18 -0400 | [diff] [blame] | 99 | SET_BDA(ivecs[0x79].seg, 0); |
| 100 | SET_BDA(ivecs[0x79].offset, 0); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 101 | |
Kevin O'Connor | 2fda7cb | 2008-07-05 20:41:53 -0400 | [diff] [blame] | 102 | set_irq(0x1E, &diskette_param_table2); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | static void |
| 106 | init_ebda() |
| 107 | { |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 108 | memset(ebda, 0, sizeof(*ebda)); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 109 | ebda->size = EBDA_SIZE; |
Kevin O'Connor | 438f635 | 2008-03-30 21:46:53 -0400 | [diff] [blame] | 110 | SET_BDA(ebda_seg, SEG_EBDA); |
| 111 | SET_BDA(ivecs[0x41].seg, SEG_EBDA); |
Kevin O'Connor | e906149 | 2008-03-11 21:54:18 -0400 | [diff] [blame] | 112 | SET_BDA(ivecs[0x41].offset |
Kevin O'Connor | 9f0d94d | 2008-04-13 17:25:30 -0400 | [diff] [blame] | 113 | , offsetof(struct extended_bios_data_area_s, fdpt[0])); |
Kevin O'Connor | 438f635 | 2008-03-30 21:46:53 -0400 | [diff] [blame] | 114 | SET_BDA(ivecs[0x46].seg, SEG_EBDA); |
Kevin O'Connor | e906149 | 2008-03-11 21:54:18 -0400 | [diff] [blame] | 115 | SET_BDA(ivecs[0x41].offset |
Kevin O'Connor | 9f0d94d | 2008-04-13 17:25:30 -0400 | [diff] [blame] | 116 | , offsetof(struct extended_bios_data_area_s, fdpt[1])); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | static void |
Kevin O'Connor | 9571ac2 | 2008-05-17 22:20:27 -0400 | [diff] [blame] | 120 | ram_probe(void) |
| 121 | { |
Kevin O'Connor | 35192dd | 2008-06-08 19:18:33 -0400 | [diff] [blame] | 122 | dprintf(3, "Find memory size\n"); |
Kevin O'Connor | f64f0db | 2008-05-18 02:42:58 -0400 | [diff] [blame] | 123 | if (CONFIG_COREBOOT) { |
Kevin O'Connor | c781293 | 2008-06-08 23:08:12 -0400 | [diff] [blame] | 124 | coreboot_fill_map(); |
Kevin O'Connor | f64f0db | 2008-05-18 02:42:58 -0400 | [diff] [blame] | 125 | } else { |
| 126 | // On emulators, get memory size from nvram. |
Kevin O'Connor | 59c35f2 | 2008-10-25 23:05:42 -0400 | [diff] [blame] | 127 | u32 rs = ((inb_cmos(CMOS_MEM_EXTMEM2_LOW) << 16) |
| 128 | | (inb_cmos(CMOS_MEM_EXTMEM2_HIGH) << 24)); |
Kevin O'Connor | f64f0db | 2008-05-18 02:42:58 -0400 | [diff] [blame] | 129 | if (rs) |
| 130 | rs += 16 * 1024 * 1024; |
| 131 | else |
Kevin O'Connor | 59c35f2 | 2008-10-25 23:05:42 -0400 | [diff] [blame] | 132 | rs = (((inb_cmos(CMOS_MEM_EXTMEM_LOW) << 10) |
| 133 | | (inb_cmos(CMOS_MEM_EXTMEM_HIGH) << 18)) |
Kevin O'Connor | f64f0db | 2008-05-18 02:42:58 -0400 | [diff] [blame] | 134 | + 1 * 1024 * 1024); |
Kevin O'Connor | c781293 | 2008-06-08 23:08:12 -0400 | [diff] [blame] | 135 | SET_EBDA(ram_size, rs); |
| 136 | add_e820(0, rs, E820_RAM); |
| 137 | |
Kevin O'Connor | 59c35f2 | 2008-10-25 23:05:42 -0400 | [diff] [blame] | 138 | // Check for memory over 4Gig |
| 139 | u64 high = ((inb_cmos(CMOS_MEM_HIGHMEM_LOW) << 16) |
| 140 | | (inb_cmos(CMOS_MEM_HIGHMEM_MID) << 24) |
| 141 | | ((u64)inb_cmos(CMOS_MEM_HIGHMEM_HIGH) << 32)); |
| 142 | SET_EBDA(ram_size_over4G, high); |
| 143 | add_e820(0x100000000ull, high, E820_RAM); |
| 144 | |
Kevin O'Connor | c781293 | 2008-06-08 23:08:12 -0400 | [diff] [blame] | 145 | /* reserve 256KB BIOS area at the end of 4 GB */ |
| 146 | add_e820(0xfffc0000, 256*1024, E820_RESERVED); |
Kevin O'Connor | f64f0db | 2008-05-18 02:42:58 -0400 | [diff] [blame] | 147 | } |
Kevin O'Connor | 9571ac2 | 2008-05-17 22:20:27 -0400 | [diff] [blame] | 148 | |
Kevin O'Connor | b8d7a47 | 2008-06-21 11:43:32 -0400 | [diff] [blame] | 149 | // Don't declare any memory between 0xa0000 and 0x100000 |
| 150 | add_e820(0xa0000, 0x50000, E820_HOLE); |
| 151 | |
Kevin O'Connor | c781293 | 2008-06-08 23:08:12 -0400 | [diff] [blame] | 152 | // Mark known areas as reserved. |
| 153 | add_e820((u32)MAKE_FARPTR(SEG_EBDA, 0), EBDA_SIZE * 1024, E820_RESERVED); |
Kevin O'Connor | e3677b1 | 2008-07-04 15:29:23 -0400 | [diff] [blame] | 154 | add_e820(BUILD_BIOS_ADDR, BUILD_BIOS_SIZE, E820_RESERVED); |
Kevin O'Connor | c781293 | 2008-06-08 23:08:12 -0400 | [diff] [blame] | 155 | |
| 156 | dprintf(1, "ram_size=0x%08x\n", GET_EBDA(ram_size)); |
Kevin O'Connor | 9571ac2 | 2008-05-17 22:20:27 -0400 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | static void |
Kevin O'Connor | 0525d29 | 2008-07-04 06:18:30 -0400 | [diff] [blame] | 160 | init_bios_tables(void) |
| 161 | { |
| 162 | if (CONFIG_COREBOOT) |
| 163 | // XXX - not supported on coreboot yet. |
| 164 | return; |
| 165 | |
| 166 | smm_init(); |
| 167 | |
| 168 | create_pirtable(); |
| 169 | |
| 170 | mptable_init(); |
| 171 | |
| 172 | smbios_init(); |
| 173 | |
| 174 | acpi_bios_init(); |
| 175 | } |
| 176 | |
| 177 | static void |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 178 | init_boot_vectors() |
| 179 | { |
Kevin O'Connor | 4096702 | 2008-07-21 22:23:05 -0400 | [diff] [blame] | 180 | if (! CONFIG_BOOT) |
| 181 | return; |
Kevin O'Connor | 35192dd | 2008-06-08 19:18:33 -0400 | [diff] [blame] | 182 | dprintf(3, "init boot device ordering\n"); |
| 183 | |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 184 | // Floppy drive |
Kevin O'Connor | 56a506d | 2008-03-29 13:15:36 -0400 | [diff] [blame] | 185 | struct ipl_entry_s *ip = &ebda->ipl.table[0]; |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 186 | ip->type = IPL_TYPE_FLOPPY; |
| 187 | ip++; |
| 188 | |
| 189 | // First HDD |
| 190 | ip->type = IPL_TYPE_HARDDISK; |
| 191 | ip++; |
| 192 | |
| 193 | // CDROM |
Kevin O'Connor | 180a959 | 2008-03-04 22:50:53 -0500 | [diff] [blame] | 194 | if (CONFIG_CDROM_BOOT) { |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 195 | ip->type = IPL_TYPE_CDROM; |
| 196 | ip++; |
| 197 | } |
| 198 | |
Kevin O'Connor | 56a506d | 2008-03-29 13:15:36 -0400 | [diff] [blame] | 199 | ebda->ipl.count = ip - ebda->ipl.table; |
| 200 | ebda->ipl.sequence = 0xffff; |
Kevin O'Connor | f64f0db | 2008-05-18 02:42:58 -0400 | [diff] [blame] | 201 | if (CONFIG_COREBOOT) { |
| 202 | // XXX - hardcode defaults for coreboot. |
| 203 | ebda->ipl.bootorder = 0x00000231; |
Kevin O'Connor | abc7597 | 2008-05-18 00:20:53 -0400 | [diff] [blame] | 204 | ebda->ipl.checkfloppysig = 1; |
Kevin O'Connor | f64f0db | 2008-05-18 02:42:58 -0400 | [diff] [blame] | 205 | } else { |
| 206 | // On emulators, get boot order from nvram. |
| 207 | ebda->ipl.bootorder = (inb_cmos(CMOS_BIOS_BOOTFLAG2) |
| 208 | | ((inb_cmos(CMOS_BIOS_BOOTFLAG1) & 0xf0) << 4)); |
| 209 | if (!(inb_cmos(CMOS_BIOS_BOOTFLAG1) & 1)) |
| 210 | ebda->ipl.checkfloppysig = 1; |
| 211 | } |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 212 | } |
| 213 | |
Kevin O'Connor | da4a648 | 2008-06-08 13:48:06 -0400 | [diff] [blame] | 214 | // Main setup code. |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 215 | static void |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 216 | post() |
| 217 | { |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 218 | init_bda(); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 219 | init_ebda(); |
| 220 | |
Kevin O'Connor | f54c150 | 2008-06-14 15:56:16 -0400 | [diff] [blame] | 221 | pic_setup(); |
Kevin O'Connor | e6eb3f5 | 2008-04-13 17:37:41 -0400 | [diff] [blame] | 222 | timer_setup(); |
Kevin O'Connor | 714325c | 2008-11-01 20:32:27 -0400 | [diff] [blame^] | 223 | mathcp_setup(); |
| 224 | |
| 225 | vga_setup(); |
| 226 | |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 227 | kbd_setup(); |
| 228 | lpt_setup(); |
| 229 | serial_setup(); |
Kevin O'Connor | f54c150 | 2008-06-14 15:56:16 -0400 | [diff] [blame] | 230 | mouse_setup(); |
Kevin O'Connor | a2e7380 | 2008-02-27 10:27:00 -0500 | [diff] [blame] | 231 | |
Kevin O'Connor | c781293 | 2008-06-08 23:08:12 -0400 | [diff] [blame] | 232 | memmap_setup(); |
Kevin O'Connor | 9571ac2 | 2008-05-17 22:20:27 -0400 | [diff] [blame] | 233 | ram_probe(); |
Kevin O'Connor | 0525d29 | 2008-07-04 06:18:30 -0400 | [diff] [blame] | 234 | pci_bios_setup(); |
Kevin O'Connor | 0525d29 | 2008-07-04 06:18:30 -0400 | [diff] [blame] | 235 | init_bios_tables(); |
Kevin O'Connor | c781293 | 2008-06-08 23:08:12 -0400 | [diff] [blame] | 236 | memmap_finalize(); |
| 237 | |
Kevin O'Connor | 3bbcc14 | 2008-04-13 17:07:33 -0400 | [diff] [blame] | 238 | floppy_drive_setup(); |
Kevin O'Connor | 9f0d94d | 2008-04-13 17:25:30 -0400 | [diff] [blame] | 239 | hard_drive_setup(); |
Kevin O'Connor | a2e7380 | 2008-02-27 10:27:00 -0500 | [diff] [blame] | 240 | |
| 241 | init_boot_vectors(); |
Kevin O'Connor | a4d3576 | 2008-03-08 15:43:03 -0500 | [diff] [blame] | 242 | |
Kevin O'Connor | 714325c | 2008-11-01 20:32:27 -0400 | [diff] [blame^] | 243 | optionrom_setup(); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 244 | } |
| 245 | |
Kevin O'Connor | da4a648 | 2008-06-08 13:48:06 -0400 | [diff] [blame] | 246 | // Clear .bss section for C code. |
| 247 | static void |
| 248 | clear_bss() |
| 249 | { |
| 250 | dprintf(3, "clearing .bss section\n"); |
| 251 | extern char __bss_start[], __bss_end[]; |
| 252 | memset(__bss_start, 0, __bss_end - __bss_start); |
| 253 | } |
| 254 | |
| 255 | // Reset DMA controller |
Kevin O'Connor | 95576e7 | 2008-03-01 09:57:51 -0500 | [diff] [blame] | 256 | static void |
| 257 | init_dma() |
| 258 | { |
| 259 | // first reset the DMA controllers |
| 260 | outb(0, PORT_DMA1_MASTER_CLEAR); |
| 261 | outb(0, PORT_DMA2_MASTER_CLEAR); |
| 262 | |
| 263 | // then initialize the DMA controllers |
| 264 | outb(0xc0, PORT_DMA2_MODE_REG); |
| 265 | outb(0x00, PORT_DMA2_MASK_REG); |
| 266 | } |
| 267 | |
Kevin O'Connor | da4a648 | 2008-06-08 13:48:06 -0400 | [diff] [blame] | 268 | // Check if the machine was setup with a special restart vector. |
Kevin O'Connor | 95576e7 | 2008-03-01 09:57:51 -0500 | [diff] [blame] | 269 | static void |
| 270 | check_restart_status() |
| 271 | { |
| 272 | // Get and then clear CMOS shutdown status. |
| 273 | u8 status = inb_cmos(CMOS_RESET_CODE); |
| 274 | outb_cmos(0, CMOS_RESET_CODE); |
| 275 | |
| 276 | if (status == 0x00 || status == 0x09 || status >= 0x0d) |
| 277 | // Normal post |
| 278 | return; |
| 279 | |
Kevin O'Connor | ad4ec34 | 2008-03-02 23:25:11 -0500 | [diff] [blame] | 280 | if (status != 0x05) { |
| 281 | BX_PANIC("Unimplemented shutdown status: %02x\n", status); |
| 282 | return; |
| 283 | } |
Kevin O'Connor | 95576e7 | 2008-03-01 09:57:51 -0500 | [diff] [blame] | 284 | |
Kevin O'Connor | ad4ec34 | 2008-03-02 23:25:11 -0500 | [diff] [blame] | 285 | // XXX - this is supposed to jump without changing any memory - |
| 286 | // but the stack has been altered by the time the code gets here. |
Kevin O'Connor | f54c150 | 2008-06-14 15:56:16 -0400 | [diff] [blame] | 287 | eoi_pic2(); |
Kevin O'Connor | ad4ec34 | 2008-03-02 23:25:11 -0500 | [diff] [blame] | 288 | struct bregs br; |
| 289 | memset(&br, 0, sizeof(br)); |
Kevin O'Connor | e906149 | 2008-03-11 21:54:18 -0400 | [diff] [blame] | 290 | br.cs = GET_BDA(jump_cs_ip) >> 16; |
| 291 | br.ip = GET_BDA(jump_cs_ip); |
Kevin O'Connor | ad4ec34 | 2008-03-02 23:25:11 -0500 | [diff] [blame] | 292 | call16(&br); |
Kevin O'Connor | 95576e7 | 2008-03-01 09:57:51 -0500 | [diff] [blame] | 293 | } |
| 294 | |
Kevin O'Connor | da4a648 | 2008-06-08 13:48:06 -0400 | [diff] [blame] | 295 | // 32-bit entry point. |
Kevin O'Connor | 1978676 | 2008-03-05 21:09:59 -0500 | [diff] [blame] | 296 | void VISIBLE32 |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 297 | _start() |
| 298 | { |
Kevin O'Connor | 95576e7 | 2008-03-01 09:57:51 -0500 | [diff] [blame] | 299 | init_dma(); |
| 300 | check_restart_status(); |
| 301 | |
Kevin O'Connor | 61d6b06 | 2008-06-21 12:15:10 -0400 | [diff] [blame] | 302 | debug_serial_setup(); |
Kevin O'Connor | da4a648 | 2008-06-08 13:48:06 -0400 | [diff] [blame] | 303 | dprintf(1, "Start bios\n"); |
| 304 | |
| 305 | // Setup for .bss and .data sections |
| 306 | clear_bss(); |
| 307 | make_bios_writable(); |
| 308 | |
| 309 | // Perform main setup code. |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 310 | post(); |
Kevin O'Connor | da4a648 | 2008-06-08 13:48:06 -0400 | [diff] [blame] | 311 | |
| 312 | // Present the user with a bootup menu. |
| 313 | interactive_bootmenu(); |
| 314 | |
Kevin O'Connor | e90f264 | 2008-06-28 12:18:39 -0400 | [diff] [blame] | 315 | // Setup bios checksum. |
Kevin O'Connor | 2fda7cb | 2008-07-05 20:41:53 -0400 | [diff] [blame] | 316 | extern char bios_checksum; |
| 317 | bios_checksum = -checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE - 1); |
Kevin O'Connor | e90f264 | 2008-06-28 12:18:39 -0400 | [diff] [blame] | 318 | |
Kevin O'Connor | da4a648 | 2008-06-08 13:48:06 -0400 | [diff] [blame] | 319 | // Prep for boot process. |
| 320 | make_bios_readonly(); |
| 321 | clear_bss(); |
| 322 | |
| 323 | // Invoke int 19 to start boot process. |
| 324 | dprintf(3, "Jump to int19\n"); |
| 325 | struct bregs br; |
| 326 | memset(&br, 0, sizeof(br)); |
| 327 | call16_int(0x19, &br); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 328 | } |
Kevin O'Connor | 4b39b82 | 2008-05-08 21:47:33 -0400 | [diff] [blame] | 329 | |
Kevin O'Connor | 2fda7cb | 2008-07-05 20:41:53 -0400 | [diff] [blame] | 330 | // Ughh - some older gcc compilers have a bug which causes VISIBLE32 |
| 331 | // functions to not be exported as a global variable - force _start |
| 332 | // to be global here. |
| 333 | asm(".global _start"); |