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zynq: set mainmem->maxsize so kernel malloc() wont fail after 4MB

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

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

@@ -178,6 +178,7 @@

 void

 confinit(void)

 {

+	ulong kmem;

 	int i;

 	conf.nmach = 1;

@@ -189,7 +190,13 @@

 	conf.npage = 0;

 	for(i = 0; i < nelem(conf.mem); i++)

 		conf.npage += conf.mem[i].npage = (conf.mem[i].limit - conf.mem[i].base) >> PGSHIFT;

-	conf.upages = conf.npage - 100*1024*1024 / BY2PG;

+	kmem = 100*1024*1024;

+	conf.upages = conf.npage - kmem/BY2PG;

+	kmem -= conf.upages*sizeof(Page)

+		+ conf.nproc*sizeof(Proc)

+		+ conf.nimage*sizeof(Image);

+	mainmem->maxsize = kmem;

+	imagmem->maxsize = kmem - (kmem/10);

 }

 static uchar *

-- 

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