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Tell BIOS about the number of CPUs

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Previously, the BIOS would probe the CPUs for SMP guests.  This tends to be
very unreliably because of startup timing issues.  By passing the number of
CPUs in the CMOS, the BIOS can detect the number of CPUs much more reliably.

(Anthony Liguori)


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4114 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-03-28 22:28:08 +00:00
parent a07c67dfcc
commit 298e01b6be
1 changed files with 3 additions and 0 deletions
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3
hw/pc.c
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@ -213,6 +213,9 @@ static void cmos_init(int ram_size, const char *boot_device, BlockDriverState **
rtc_set_memory(s, 0x34, val); rtc_set_memory(s, 0x34, val);
rtc_set_memory(s, 0x35, val >> 8); rtc_set_memory(s, 0x35, val >> 8);
/* set the number of CPU */
rtc_set_memory(s, 0x5f, smp_cpus - 1);
/* set boot devices, and disable floppy signature check if requested */ /* set boot devices, and disable floppy signature check if requested */
#define PC_MAX_BOOT_DEVICES 3 #define PC_MAX_BOOT_DEVICES 3
nbds = strlen(boot_device); nbds = strlen(boot_device);