add 18th iteration of classifier

1 files changed, 107 insertions, 0 deletions

diff --git a/results/classifier/118/kernel/1733720 b/results/classifier/118/kernel/1733720
new file mode 100644
index 000000000..24227987b
--- /dev/null
+++ b/results/classifier/118/kernel/1733720
@@ -0,0 +1,107 @@
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+
+raspi2 with multiple CPU's #1
+
+Greetings,
+
+I am running a small program for raspi2 (from http://wiki.osdev.org/ARM_RaspberryPi_Tutorial_C).
+
+This code writes "Hello World", but the output ir repeated 4 times.
+
+My thought was that this is emulating a 4 cpu core system.
+
+However, when I check the MPIDR registed for CPU number, it always returns 1.
+
+I git cloned github.com/qemu/qemu.git, made & installed on Acer ARM CB5-311 under Crouton/ubuntu.
+
+
+./qemu.sh 
+1111
+
+Linux:armv7l: ~/Downloads/RaspiTest/BareBones >>> uname -a
+Linux localhost 3.10.18 #1 SMP Mon Nov 13 16:34:10 PST 2017 armv7l armv7l armv7l GNU/Linux
+
+Linux:armv7l: ~/Downloads/RaspiTest/BareBones >>> qemu-system-arm --version
+QEMU emulator version 2.10.91 (v2.11.0-rc1-dirty)
+Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
+
+=====
+static inline uint32_t read_mpdir(void)
+{
+  uint32_t id;
+  
+  asm volatile("mrc p15, 0, %[id], c0, c0, 0 @ read MIDR\n\t"
+	       : [id] "=r" (id));
+  return id;
+}
+======
+void kernel_main(uint32_t r0, uint32_t r1, uint32_t atags)
+{
+	// Declare as unused
+	(void) r0;
+	(void) r1;
+	(void) atags;
+
+	uint32_t cpu_id;
+
+	cpu_id = read_mpdir() & 0x03;
+
+	uart_putc( "01234"[cpu_id] ); /* output is "1111" */
+
+	if (cpu_id == 0) { /* code never executes 8^( */ }
+
+====== qemu.sh
+qemu-system-arm -m 256 -M raspi2 -no-reboot -serial stdio  -kernel myos.elf
+
+Thanks much,
+-KenD
+
+NOT A BUG
+
+Reviewed the code and found the problem.
+
+asm volatile("mrc p15, 0, %[id], c0, c0, 0 @ read MIDR\n\t" ...
+
+I miscopied the code above; MIDR should have been MIPDR ( 5 )
+
+I now get:
+
+Linux:armv7l: ~/Downloads/RaspiTest/BareBones >>> ./qemu.sh 
+0H312ello, kernel World!
+
+Sorry about the bogus report!
+-KenD
+
+Sorry again, "MPIDR" 
+
+Gotta learn to type!
+
+