emulator space limited to 23MB. mounting proc, tmpfs, sysfs.

Author: Fabian Meyer

.config

@@ -761,7 +761,9 @@ CONFIG_PROC_FS=y
 CONFIG_PROC_SYSCTL=y
 CONFIG_PROC_PAGE_MONITOR=y
 CONFIG_SYSFS=y
-# CONFIG_TMPFS is not set
+CONFIG_TMPFS=y
+# CONFIG_TMPFS_POSIX_ACL is not set
+# CONFIG_TMPFS_XATTR is not set
 # CONFIG_HUGETLBFS is not set
 # CONFIG_HUGETLB_PAGE is not set
 # CONFIG_CONFIGFS_FS is not set

application/scripts/inittab

@@ -1,2 +1,2 @@
 ::sysinit:/etc/init.d/rcS
-::askfirst:/bin/sh
+tty1::askfirst:/bin/sh

application/scripts/mount.sh

@@ -1,6 +1,11 @@
 #!/bin/sh
 
+echo "Mounting proc..."
+mount -t proc /proc /proc
 echo "Mounting sysfs..."
-#mount -t sysfs /sys /sys
-echo "Mounting procfs..."
-#mount -t procfs /proc /proc
+mount -t sysfs /sys /sys
+echo "Mounting tmpfs..."
+mount -t tmpfs /tmp /tmp
+echo "Populate dev..."
+mdev -s
+echo "complete"

application/src/helloworld.c

@@ -3,6 +3,7 @@
 #include <errno.h>
 #include <string.h>
 #include <unistd.h>
+#define MB 1000000
 
 void printHelloWorld();
 int printSysInfo();
@@ -36,8 +37,8 @@ int printSysInfo()
 	}
 
 	printf("Uptime: %lu\n", l_sysinfo.uptime);
-	printf("Total RAM: %lu\n", l_sysinfo.totalram);
-	printf("Free RAM: %lu\n", l_sysinfo.freeram);
+	printf("Total RAM: %lu MB\n", l_sysinfo.totalram / MB);
+	printf("Free RAM: %lu MB\n", l_sysinfo.freeram / MB);
 	printf("Process Count:%hi\n", l_sysinfo.procs);
 	printf("Page size: %d\n", l_sysinfo.mem_unit);
 	return 0;

emulate

@@ -2,4 +2,4 @@
 
 IMGPATH="arch/x86/boot/bzImage"
 
-qemu-system-i386 -kernel $IMGPATH -curses -monitor telnet:127.0.0.1:7777,server
+qemu-system-i386 -kernel $IMGPATH -curses -monitor telnet:127.0.0.1:7777,server -m 23

rootFSconfig

@@ -11,10 +11,6 @@ dir /proc 755 0 0
 dir /sys 755 0 0
 dir /etc/init.d 755 0 0
 nod /dev/console 777 0 0 c 5 1
-nod /dev/null 777 0 0 c 1 3
-nod /dev/zero 777 0 0 c 1 5
-nod /dev/tty0 777 0 0 c 4 0
-nod /dev/tty1 777 0 0 c 4 1
 file /bin/busybox busybox 755 0 0
 file /usr/bin/helloworld application/bin/helloworld 755 0 0
 file /etc/inittab application/scripts/inittab 755 0 0
@@ -30,3 +26,16 @@ slink /bin/mv busybox 777 0 0
 slink /bin/rm busybox 777 0 0
 slink /init /bin/busybox 777 0 0
 slink /bin/sleep busybox 777 0 0
+slink /bin/mdev busybox 777 0 0
+slink /bin/ps busybox 777 0 0
+slink /bin/kill busybox 777 0 0
+slink /bin/top busybox 777 0 0
+slink /bin/rmdir busybox 777 0 0
+slink /bin/free busybox 777 0 0
+slink /bin/ln busybox 777 0 0
+slink /bin/touch busybox 777 0 0
+slink /bin/taskset busybox 777 0 0
+slink /bin/time busybox 777 0 0
+slink /bin/zcat busybox 777 0 0
+slink /bin/who busybox 777 0 0
+slink /bin/chmod busybox 777 0 0