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