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