ref: 00bfe3ec2bb2f0e5e33130cb32655453e37abba6
dir: /sys/src/9/pc/bootargs.c/
#include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #define MAXCONF 64 static char *confname[MAXCONF]; static char *confval[MAXCONF]; static int nconf; /* screen.c */ extern char* rgbmask2chan(char *buf, int depth, u32int rm, u32int gm, u32int bm); /* vgavesa.c */ extern char* vesabootscreenconf(char*, char*, uchar*); static void multibootargs(void) { extern ulong multibootptr; ulong *multiboot; char *cp, *ep, *s; ulong *m, l; int i, n; if(multibootptr == 0 || multibootptr >= MemMin) return; multiboot = (ulong*)KADDR(multibootptr); cp = BOOTARGS; ep = cp + BOOTARGSLEN-1; /* memory map */ if((multiboot[0] & (1<<6)) != 0 && (l = multiboot[11]) >= 24){ cp = seprint(cp, ep, "*e820="); m = KADDR(multiboot[12]); while(m[0] >= 20 && m[0]+4 <= l){ uvlong base, size; m++; base = ((uvlong)m[0] | (uvlong)m[1]<<32); size = ((uvlong)m[2] | (uvlong)m[3]<<32); cp = seprint(cp, ep, "%.1lux %.16llux %.16llux ", m[4] & 0xF, base, base+size); l -= m[-1]+4; m = (ulong*)((uintptr)m + m[-1]); } cp[-1] = '\n'; } if((multiboot[0] & (1<<12)) != 0 && multiboot[22] != 0){ /* framebuffer */ uchar *p = (uchar*)multiboot + 112; int depth = multiboot[27] & 0xFF; char chan[32]; switch((multiboot[27]>>8) & 0xFF){ case 0: snprint(chan, sizeof chan, "m%d", depth); if(0){ case 1: rgbmask2chan(chan, depth, (1UL<<p[1])-1 << p[0], (1UL<<p[3])-1 << p[2], (1UL<<p[5])-1 << p[4]); } cp = seprint(cp, ep, "*bootscreen=%dx%dx%d %s %#lux\n", (int)multiboot[24]*8 / depth, (int)multiboot[26], depth, chan, multiboot[22]); } } else if((multiboot[0] & (1<<11)) != 0 && multiboot[19] != 0) /* vbe mode info */ cp = vesabootscreenconf(cp, ep, KADDR(multiboot[19])); /* plan9.ini passed as the first module */ if((multiboot[0] & (1<<3)) != 0 && multiboot[5] > 0 && multiboot[6] != 0){ m = KADDR(multiboot[6]); s = (char*)KADDR(m[0]); if(m[1] > m[0]){ n = utfnlen(s, m[1] - m[0]); if(n > 0) cp = seprint(cp, ep, "%.*s\n", n, s); } } /* command line */ if((multiboot[0] & (1<<2)) != 0 && multiboot[4] != 0){ n = tokenize(KADDR(multiboot[4]), confval, MAXCONF); for(i=0; i<n; i++) cp = seprint(cp, ep, "%s\n", confval[i]); } *cp = 0; } void bootargsinit(void) { int i, j, n; char *cp, *line[MAXCONF], *p, *q; multibootargs(); /* * parse configuration args from dos file plan9.ini */ cp = BOOTARGS; /* where b.com leaves its config */ cp[BOOTARGSLEN-1] = 0; /* * Strip out '\r', change '\t' -> ' '. */ p = cp; for(q = cp; *q; q++){ if(*q == '\r') continue; if(*q == '\t') *q = ' '; *p++ = *q; } *p = 0; n = getfields(cp, line, MAXCONF, 1, "\n"); for(i = 0; i < n; i++){ if(*line[i] == '#') continue; cp = strchr(line[i], '='); if(cp == nil) continue; *cp++ = '\0'; for(j = 0; j < nconf; j++){ if(cistrcmp(confname[j], line[i]) == 0) break; } confname[j] = line[i]; confval[j] = cp; if(j == nconf) nconf++; } } char* getconf(char *name) { int i; for(i = 0; i < nconf; i++) if(cistrcmp(confname[i], name) == 0) return confval[i]; return 0; } void setconfenv(void) { int i; for(i = 0; i < nconf; i++){ if(confname[i][0] != '*') ksetenv(confname[i], confval[i], 0); ksetenv(confname[i], confval[i], 1); } } void writeconf(void) { char *p, *q; int n; p = getconfenv(); if(waserror()) { free(p); nexterror(); } /* convert to name=value\n format */ for(q=p; *q; q++) { q += strlen(q); *q = '='; q += strlen(q); *q = '\n'; } n = q - p + 1; if(n >= BOOTARGSLEN) error("kernel configuration too large"); memmove(BOOTARGS, p, n); memset(BOOTLINE, 0, BOOTLINELEN); poperror(); free(p); }