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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
commitdee4dcba78baf712cab403d47d9db319ab7f95d6 (patch)
tree418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/118/kernel/1733720
parent4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff)
downloademulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz
emulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip
restructure results
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@@ -1,107 +0,0 @@
-mistranslation: 0.985
-architecture: 0.972
-kernel: 0.959
-device: 0.937
-performance: 0.931
-arm: 0.929
-graphic: 0.903
-peripherals: 0.879
-user-level: 0.844
-semantic: 0.835
-debug: 0.814
-ppc: 0.809
-assembly: 0.805
-socket: 0.769
-boot: 0.755
-files: 0.709
-vnc: 0.708
-register: 0.576
-permissions: 0.568
-network: 0.539
-KVM: 0.500
-VMM: 0.469
-risc-v: 0.467
-x86: 0.461
-PID: 0.458
-virtual: 0.415
-TCG: 0.381
-hypervisor: 0.315
-i386: 0.233
-
-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!
-
-