sys/src/9/pc/bootargs.c

   1 #include        "u.h"
   2 #include        "../port/lib.h"
   3 #include        "mem.h"
   4 #include        "dat.h"
   5 #include        "fns.h"
   6
   7 #define MAXCONF 64
   8 static char *confname[MAXCONF];
   9 static char *confval[MAXCONF];
  10 static int nconf;
  11
  12 /* screen.c */
  13 extern char* rgbmask2chan(char *buf, int depth, u32int rm, u32int gm, u32int bm);
  14
  15 /* vgavesa.c */
  16 extern char* vesabootscreenconf(char*, char*, uchar*);
  17
  18 static void
  19 multibootargs(void)
  20 {
  21         extern ulong multibootptr;
  22         ulong *multiboot;
  23         char *cp, *ep, *s;
  24         ulong *m, l;
  25         int i, n;
  26
  27         if(multibootptr == 0 || multibootptr >= MemMin)
  28                 return;
  29
  30         multiboot = (ulong*)KADDR(multibootptr);
  31
  32         cp = BOOTARGS;
  33         ep = cp + BOOTARGSLEN-1;
  34
  35         /* memory map */
  36         if((multiboot[0] & (1<<6)) != 0 && (l = multiboot[11]) >= 24){
  37                 cp = seprint(cp, ep, "*e820=");
  38                 m = KADDR(multiboot[12]);
  39                 while(m[0] >= 20 && m[0]+4 <= l){
  40                         uvlong base, size;
  41                         m++;
  42                         base = ((uvlong)m[0] | (uvlong)m[1]<<32);
  43                         size = ((uvlong)m[2] | (uvlong)m[3]<<32);
  44                         cp = seprint(cp, ep, "%.1lux %.16llux %.16llux ",
  45                                 m[4] & 0xF, base, base+size);
  46                         l -= m[-1]+4;
  47                         m = (ulong*)((uintptr)m + m[-1]);
  48                 }
  49                 cp[-1] = '\n';
  50         }
  51
  52         if((multiboot[0] & (1<<12)) != 0 && multiboot[22] != 0){        /* framebuffer */
  53                 uchar *p = (uchar*)multiboot + 112;
  54                 int depth = multiboot[27] & 0xFF;
  55                 char chan[32];
  56
  57                 switch((multiboot[27]>>8) & 0xFF){
  58                 case 0:
  59                         snprint(chan, sizeof chan, "m%d", depth);
  60                         if(0){
  61                 case 1:
  62                         rgbmask2chan(chan, depth,
  63                                 (1UL<<p[1])-1 << p[0],
  64                                 (1UL<<p[3])-1 << p[2],
  65                                 (1UL<<p[5])-1 << p[4]);
  66                         }
  67                         cp = seprint(cp, ep, "*bootscreen=%dx%dx%d %s %#lux\n",
  68                                 (int)multiboot[24]*8 / depth,
  69                                 (int)multiboot[26],
  70                                 depth,
  71                                 chan,
  72                                 multiboot[22]);
  73                 }
  74         } else
  75         if((multiboot[0] & (1<<11)) != 0 && multiboot[19] != 0)         /* vbe mode info */
  76                 cp = vesabootscreenconf(cp, ep, KADDR(multiboot[19]));
  77
  78         /* plan9.ini passed as the first module */
  79         if((multiboot[0] & (1<<3)) != 0 && multiboot[5] > 0 && multiboot[6] != 0){
  80                 m = KADDR(multiboot[6]);
  81                 s = (char*)KADDR(m[0]);
  82                 if(m[1] > m[0]){
  83                         n = utfnlen(s, m[1] - m[0]);
  84                         if(n > 0)
  85                                 cp = seprint(cp, ep, "%.*s\n", n, s);
  86                 }
  87         }
  88
  89         /* command line */
  90         if((multiboot[0] & (1<<2)) != 0 && multiboot[4] != 0){
  91                 n = tokenize(KADDR(multiboot[4]), confval, MAXCONF);
  92                 for(i=0; i<n; i++)
  93                         cp = seprint(cp, ep, "%s\n", confval[i]);
  94         }
  95
  96         *cp = 0;
  97 }
  98
  99 void
 100 bootargsinit(void)
 101 {
 102         int i, j, n;
 103         char *cp, *line[MAXCONF], *p, *q;
 104
 105         multibootargs();
 106
 107         /*
 108          *  parse configuration args from dos file plan9.ini
 109          */
 110         cp = BOOTARGS;  /* where b.com leaves its config */
 111         cp[BOOTARGSLEN-1] = 0;
 112
 113         /*
 114          * Strip out '\r', change '\t' -> ' '.
 115          */
 116         p = cp;
 117         for(q = cp; *q; q++){
 118                 if(*q == '\r')
 119                         continue;
 120                 if(*q == '\t')
 121                         *q = ' ';
 122                 *p++ = *q;
 123         }
 124         *p = 0;
 125
 126         n = getfields(cp, line, MAXCONF, 1, "\n");
 127         for(i = 0; i < n; i++){
 128                 if(*line[i] == '#')
 129                         continue;
 130                 cp = strchr(line[i], '=');
 131                 if(cp == nil)
 132                         continue;
 133                 *cp++ = '\0';
 134                 for(j = 0; j < nconf; j++){
 135                         if(cistrcmp(confname[j], line[i]) == 0)
 136                                 break;
 137                 }
 138                 confname[j] = line[i];
 139                 confval[j] = cp;
 140                 if(j == nconf)
 141                         nconf++;
 142         }
 143 }
 144
 145 char*
 146 getconf(char *name)
 147 {
 148         int i;
 149
 150         for(i = 0; i < nconf; i++)
 151                 if(cistrcmp(confname[i], name) == 0)
 152                         return confval[i];
 153         return 0;
 154 }
 155
 156 void
 157 setconfenv(void)
 158 {
 159         int i;
 160
 161         for(i = 0; i < nconf; i++){
 162                 if(confname[i][0] != '*')
 163                         ksetenv(confname[i], confval[i], 0);
 164                 ksetenv(confname[i], confval[i], 1);
 165         }
 166 }
 167
 168 void
 169 writeconf(void)
 170 {
 171         char *p, *q;
 172         int n;
 173
 174         p = getconfenv();
 175         if(waserror()) {
 176                 free(p);
 177                 nexterror();
 178         }
 179
 180         /* convert to name=value\n format */
 181         for(q=p; *q; q++) {
 182                 q += strlen(q);
 183                 *q = '=';
 184                 q += strlen(q);
 185                 *q = '\n';
 186         }
 187         n = q - p + 1;
 188         if(n >= BOOTARGSLEN)
 189                 error("kernel configuration too large");
 190         memmove(BOOTARGS, p, n);
 191         memset(BOOTLINE, 0, BOOTLINELEN);
 192         poperror();
 193         free(p);
 194 }