190 lines
3.5 KiB
C
190 lines
3.5 KiB
C
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#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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#define MAXCONF 64
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static char *confname[MAXCONF];
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static char *confval[MAXCONF];
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static int nconf;
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/* screen.c */
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extern char* rgbmask2chan(char *buf, int depth, u32int rm, u32int gm, u32int bm);
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/* vgavesa.c */
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extern char* vesabootscreenconf(char*, char*, uchar*);
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static void
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multibootargs(void)
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{
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extern ulong multibootptr;
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ulong *multiboot;
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char *cp, *ep;
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ulong *m, l;
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if(multibootptr == 0)
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return;
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multiboot = (ulong*)KADDR(multibootptr);
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/* command line */
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if((multiboot[0] & (1<<2)) != 0)
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strncpy(BOOTLINE, KADDR(multiboot[4]), BOOTLINELEN-1);
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cp = BOOTARGS;
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ep = cp + BOOTARGSLEN-1;
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/* memory map */
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if((multiboot[0] & (1<<6)) != 0 && (l = multiboot[11]) >= 24){
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cp = seprint(cp, ep, "*e820=");
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m = KADDR(multiboot[12]);
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while(m[0] >= 20 && m[0]+4 <= l){
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uvlong base, size;
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m++;
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base = ((uvlong)m[0] | (uvlong)m[1]<<32);
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size = ((uvlong)m[2] | (uvlong)m[3]<<32);
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cp = seprint(cp, ep, "%.1lux %.16llux %.16llux ",
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m[4] & 0xF, base, base+size);
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l -= m[-1]+4;
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m = (ulong*)((uintptr)m + m[-1]);
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}
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cp[-1] = '\n';
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}
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if((multiboot[0] & (1<<12)) != 0 && multiboot[22] != 0){ /* framebuffer */
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uchar *p = (uchar*)multiboot + 112;
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int depth = multiboot[27] & 0xFF;
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char chan[32];
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switch((multiboot[27]>>8) & 0xFF){
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case 0:
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snprint(chan, sizeof chan, "m%d", depth);
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if(0){
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case 1:
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rgbmask2chan(chan, depth,
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(1UL<<p[1])-1 << p[0],
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(1UL<<p[3])-1 << p[2],
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(1UL<<p[5])-1 << p[4]);
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}
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cp = seprint(cp, ep, "*bootscreen=%dx%dx%d %s %#lux\n",
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(int)multiboot[24]*8 / depth,
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(int)multiboot[26],
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depth,
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chan,
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multiboot[22]);
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}
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} else
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if((multiboot[0] & (1<<11)) != 0 && multiboot[19] != 0) /* vbe mode info */
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cp = vesabootscreenconf(cp, ep, KADDR(multiboot[19]));
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/* plan9.ini passed as the first module */
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if((multiboot[0] & (1<<3)) != 0 && multiboot[5] > 0){
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m = KADDR(multiboot[6]);
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l = m[1] - m[0];
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m = KADDR(m[0]);
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if(cp+l > ep)
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l = ep - cp;
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memmove(cp, m, l);
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cp += l;
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}
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*cp = 0;
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}
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void
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bootargsinit(void)
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{
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int i, j, n;
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char *cp, *line[MAXCONF], *p, *q;
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multibootargs();
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/*
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* parse configuration args from dos file plan9.ini
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*/
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cp = BOOTARGS; /* where b.com leaves its config */
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cp[BOOTARGSLEN-1] = 0;
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/*
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* Strip out '\r', change '\t' -> ' '.
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*/
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p = cp;
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for(q = cp; *q; q++){
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if(*q == '\r')
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continue;
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if(*q == '\t')
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*q = ' ';
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*p++ = *q;
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}
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*p = 0;
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n = getfields(cp, line, MAXCONF, 1, "\n");
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for(i = 0; i < n; i++){
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if(*line[i] == '#')
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continue;
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cp = strchr(line[i], '=');
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if(cp == nil)
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continue;
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*cp++ = '\0';
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for(j = 0; j < nconf; j++){
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if(cistrcmp(confname[j], line[i]) == 0)
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break;
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}
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confname[j] = line[i];
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confval[j] = cp;
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if(j == nconf)
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nconf++;
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}
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}
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char*
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getconf(char *name)
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{
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int i;
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for(i = 0; i < nconf; i++)
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if(cistrcmp(confname[i], name) == 0)
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return confval[i];
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return 0;
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}
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void
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setconfenv(void)
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{
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int i;
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for(i = 0; i < nconf; i++){
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if(confname[i][0] != '*')
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ksetenv(confname[i], confval[i], 0);
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ksetenv(confname[i], confval[i], 1);
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}
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}
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void
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writeconf(void)
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{
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char *p, *q;
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int n;
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p = getconfenv();
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if(waserror()) {
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free(p);
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nexterror();
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}
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/* convert to name=value\n format */
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for(q=p; *q; q++) {
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q += strlen(q);
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*q = '=';
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q += strlen(q);
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*q = '\n';
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}
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n = q - p + 1;
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if(n >= BOOTARGSLEN)
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error("kernel configuration too large");
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memset(BOOTLINE, 0, BOOTLINELEN);
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memmove(BOOTARGS, p, n);
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poperror();
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free(p);
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}
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