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bcm kernel: add *kernelpercent option for cmdline.txt

--- a/sys/src/9/bcm/main.c

+++ b/sys/src/9/bcm/main.c

@@ -425,11 +425,16 @@

 void

 confinit(void)

 {

-	int i;

+	int i, userpcnt;

 	ulong kpages;

 	uintptr pa;

 	char *p;

+	if(p = getconf("*kernelpercent"))

+		userpcnt = 100 - strtol(p, 0, 0);

+	else

+		userpcnt = 0;

+

 	if(0 && (p = getconf("service")) != nil){

 		if(strcmp(p, "cpu") == 0)

 			cpuserver = 1;

@@ -465,9 +470,20 @@

 		conf.npage += conf.mem[i].npage;

 	}

-	conf.upages = (conf.npage*80)/100;

-	conf.ialloc = ((conf.npage-conf.upages)/2)*BY2PG;

+	if(userpcnt < 10)

+		userpcnt = 60 + cpuserver*10;

+	kpages = conf.npage - (conf.npage*userpcnt)/100;

+	/*

+	 * can't go past the end of virtual memory

+	 * (ulong)-KZERO is 2^32 - KZERO

+	 */

+	if(kpages > ((ulong)-KZERO)/BY2PG)

+		kpages = ((ulong)-KZERO)/BY2PG;

+

+	conf.upages = conf.npage - kpages;

+	conf.ialloc = (kpages/2)*BY2PG;

+

 	/* only one processor */

 	conf.nmach = 1;

@@ -494,7 +510,7 @@

 		+ conf.nproc*sizeof(Proc)

 		+ conf.nimage*sizeof(Image)

 		+ conf.nswap

-		+ conf.nswppo*sizeof(Page);

+		+ conf.nswppo*sizeof(Page*);

 	mainmem->maxsize = kpages;

 	if(!cpuserver)

 		/*