1 2 #define UNPAGED 1 /* for proper kmain() prototype */ 3 4 #include <assert.h> 5 #include <stdlib.h> 6 #include <minix/minlib.h> 7 #include <minix/board.h> 8 #include <sys/reboot.h> 9 #include <machine/partition.h> 10 #include "string.h" 11 #include "direct_utils.h" 12 #include "serial.h" 13 #include "glo.h" 14 15 #if USE_SYSDEBUG 16 #define MULTIBOOT_VERBOSE 1 17 #endif 18 19 /* to-be-built kinfo struct, diagnostics buffer */ 20 kinfo_t kinfo; 21 struct kmessages kmessages; 22 23 /* pg_utils.c uses this; in this phase, there is a 1:1 mapping. */ 24 phys_bytes vir2phys(void *addr) { return (phys_bytes) addr; } 25 26 /* mb_utils.c uses this; we can reach it directly */ 27 char *video_mem = (char *) MULTIBOOT_VIDEO_BUFFER; 28 29 /* String length used for mb_itoa */ 30 #define ITOA_BUFFER_SIZE 20 31 32 /* Kernel may use memory */ 33 int kernel_may_alloc = 1; 34 35 static int mb_set_param(char *bigbuf, char *name, char *value, kinfo_t *cbi) 36 { 37 char *p = bigbuf; 38 char *bufend = bigbuf + MULTIBOOT_PARAM_BUF_SIZE; 39 char *q; 40 int namelen = strlen(name); 41 int valuelen = strlen(value); 42 43 /* Some variables we recognize */ 44 if(!strcmp(name, SERVARNAME)) { cbi->do_serial_debug = 1; } 45 if(!strcmp(name, SERBAUDVARNAME)) { cbi->serial_debug_baud = atoi(value); } 46 47 /* Delete the item if already exists */ 48 while (*p) { 49 if (strncmp(p, name, namelen) == 0 && p[namelen] == '=') { 50 q = p; 51 while (*q) q++; 52 for (q++; q < bufend; q++, p++) 53 *p = *q; 54 break; 55 } 56 while (*p++) 57 ; 58 p++; 59 } 60 61 for (p = bigbuf; p < bufend && (*p || *(p + 1)); p++) 62 ; 63 if (p > bigbuf) p++; 64 65 /* Make sure there's enough space for the new parameter */ 66 if (p + namelen + valuelen + 3 > bufend) 67 return -1; 68 69 strcpy(p, name); 70 p[namelen] = '='; 71 strcpy(p + namelen + 1, value); 72 p[namelen + valuelen + 1] = 0; 73 p[namelen + valuelen + 2] = 0; 74 return 0; 75 } 76 77 int overlaps(multiboot_module_t *mod, int n, int cmp_mod) 78 { 79 multiboot_module_t *cmp = &mod[cmp_mod]; 80 int m; 81 82 #define INRANGE(mod, v) ((v) >= mod->mod_start && (v) < mod->mod_end) 83 #define OVERLAP(mod1, mod2) (INRANGE(mod1, mod2->mod_start) || \ 84 INRANGE(mod1, mod2->mod_end-1)) 85 for(m = 0; m < n; m++) { 86 multiboot_module_t *thismod = &mod[m]; 87 if(m == cmp_mod) continue; 88 if(OVERLAP(thismod, cmp)) 89 return 1; 90 } 91 return 0; 92 } 93 94 void get_parameters(u32_t ebx, kinfo_t *cbi) 95 { 96 multiboot_memory_map_t *mmap; 97 multiboot_info_t *mbi = &cbi->mbi; 98 int var_i,value_i, m, k; 99 char *p; 100 extern char _kern_phys_base, _kern_vir_base, _kern_size, 101 _kern_unpaged_start, _kern_unpaged_end; 102 phys_bytes kernbase = (phys_bytes) &_kern_phys_base, 103 kernsize = (phys_bytes) &_kern_size; 104 #define BUF 1024 105 static char cmdline[BUF]; 106 107 /* get our own copy of the multiboot info struct and module list */ 108 memcpy((void *) mbi, (void *) ebx, sizeof(*mbi)); 109 110 /* Set various bits of info for the higher-level kernel. */ 111 cbi->mem_high_phys = 0; 112 cbi->user_sp = (vir_bytes) &_kern_vir_base; 113 cbi->vir_kern_start = (vir_bytes) &_kern_vir_base; 114 cbi->bootstrap_start = (vir_bytes) &_kern_unpaged_start; 115 cbi->bootstrap_len = (vir_bytes) &_kern_unpaged_end - 116 cbi->bootstrap_start; 117 cbi->kmess = &kmess; 118 119 /* set some configurable defaults */ 120 cbi->do_serial_debug = 0; 121 cbi->serial_debug_baud = 115200; 122 123 /* parse boot command line */ 124 if (mbi->mi_flags & MULTIBOOT_INFO_HAS_CMDLINE) { 125 static char var[BUF]; 126 static char value[BUF]; 127 128 /* Override values with cmdline argument */ 129 memcpy(cmdline, (void *) mbi->mi_cmdline, BUF); 130 p = cmdline; 131 while (*p) { 132 var_i = 0; 133 value_i = 0; 134 while (*p == ' ') p++; 135 if (!*p) break; 136 while (*p && *p != '=' && *p != ' ' && var_i < BUF - 1) 137 var[var_i++] = *p++ ; 138 var[var_i] = 0; 139 if (*p++ != '=') continue; /* skip if not name=value */ 140 while (*p && *p != ' ' && value_i < BUF - 1) 141 value[value_i++] = *p++ ; 142 value[value_i] = 0; 143 144 mb_set_param(cbi->param_buf, var, value, cbi); 145 } 146 } 147 148 /* let higher levels know what we are booting on */ 149 mb_set_param(cbi->param_buf, ARCHVARNAME, (char *)get_board_arch_name(BOARD_ID_INTEL), cbi); 150 mb_set_param(cbi->param_buf, BOARDVARNAME,(char *)get_board_name(BOARD_ID_INTEL) , cbi); 151 152 /* move user stack/data down to leave a gap to catch kernel 153 * stack overflow; and to distinguish kernel and user addresses 154 * at a glance (0xf.. vs 0xe..) 155 */ 156 cbi->user_sp = USR_STACKTOP; 157 cbi->user_end = USR_DATATOP; 158 159 /* kernel bytes without bootstrap code/data that is currently 160 * still needed but will be freed after bootstrapping. 161 */ 162 kinfo.kernel_allocated_bytes = (phys_bytes) &_kern_size; 163 kinfo.kernel_allocated_bytes -= cbi->bootstrap_len; 164 165 assert(!(cbi->bootstrap_start % I386_PAGE_SIZE)); 166 cbi->bootstrap_len = rounddown(cbi->bootstrap_len, I386_PAGE_SIZE); 167 assert(mbi->mi_flags & MULTIBOOT_INFO_HAS_MODS); 168 assert(mbi->mi_mods_count < MULTIBOOT_MAX_MODS); 169 assert(mbi->mi_mods_count > 0); 170 memcpy(&cbi->module_list, (void *) mbi->mi_mods_addr, 171 mbi->mi_mods_count * sizeof(multiboot_module_t)); 172 173 memset(cbi->memmap, 0, sizeof(cbi->memmap)); 174 /* mem_map has a variable layout */ 175 if(mbi->mi_flags & MULTIBOOT_INFO_HAS_MMAP) { 176 cbi->mmap_size = 0; 177 for (mmap = (multiboot_memory_map_t *) mbi->mmap_addr; 178 (unsigned long) mmap < mbi->mmap_addr + mbi->mmap_length; 179 mmap = (multiboot_memory_map_t *) 180 ((unsigned long) mmap + mmap->mm_size + sizeof(mmap->mm_size))) { 181 if(mmap->mm_type != MULTIBOOT_MEMORY_AVAILABLE) continue; 182 add_memmap(cbi, mmap->mm_base_addr, mmap->mm_length); 183 } 184 } else { 185 assert(mbi->mi_flags & MULTIBOOT_INFO_HAS_MEMORY); 186 add_memmap(cbi, 0, mbi->mi_mem_lower*1024); 187 add_memmap(cbi, 0x100000, mbi->mi_mem_upper*1024); 188 } 189 190 /* Sanity check: the kernel nor any of the modules may overlap 191 * with each other. Pretend the kernel is an extra module for a 192 * second. 193 */ 194 k = mbi->mi_mods_count; 195 assert(k < MULTIBOOT_MAX_MODS); 196 cbi->module_list[k].mod_start = kernbase; 197 cbi->module_list[k].mod_end = kernbase + kernsize; 198 cbi->mods_with_kernel = mbi->mi_mods_count+1; 199 cbi->kern_mod = k; 200 201 for(m = 0; m < cbi->mods_with_kernel; m++) { 202 #if 0 203 printf("checking overlap of module %08lx-%08lx\n", 204 cbi->module_list[m].mod_start, cbi->module_list[m].mod_end); 205 #endif 206 if(overlaps(cbi->module_list, cbi->mods_with_kernel, m)) 207 panic("overlapping boot modules/kernel"); 208 /* We cut out the bits of memory that we know are 209 * occupied by the kernel and boot modules. 210 */ 211 cut_memmap(cbi, 212 cbi->module_list[m].mod_start, 213 cbi->module_list[m].mod_end); 214 } 215 } 216 217 kinfo_t *pre_init(u32_t magic, u32_t ebx) 218 { 219 assert(magic == MULTIBOOT_INFO_MAGIC); 220 221 /* Get our own copy boot params pointed to by ebx. 222 * Here we find out whether we should do serial output. 223 */ 224 get_parameters(ebx, &kinfo); 225 226 /* Make and load a pagetable that will map the kernel 227 * to where it should be; but first a 1:1 mapping so 228 * this code stays where it should be. 229 */ 230 pg_clear(); 231 pg_identity(&kinfo); 232 kinfo.freepde_start = pg_mapkernel(); 233 pg_load(); 234 vm_enable_paging(); 235 236 /* Done, return boot info so it can be passed to kmain(). */ 237 return &kinfo; 238 } 239 240 void send_diag_sig(void) { } 241 void minix_shutdown(int how) { arch_shutdown(how); } 242 void busy_delay_ms(int x) { } 243 int raise(int sig) { panic("raise(%d)\n", sig); } 244