Messages in this thread | | | Date | Mon, 18 May 1998 09:11:10 -0100 | From | André Derrick Balsa <> | Subject | Cyrix 6x86MX and Centaur C6 CPUs in 2.1.102 |
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Hello Linus,
I have noticed that, as a result of my previous posts, you modified the apm driver, setup.c and time.c in kernel 2.1.102.
The mod in setup.c is more or less:
if (cyrix_CPU_detected) turn_off_tsc_flag;
which is sub-optimal, and breaks code that tries to detect TSC capability by reading /proc/cpuinfo, in machines equipped with a 6x86MX or a C6.
The Cyrix 6x86MX has a fully compatible TSC implementation. However, it also allows turning off the CPU when a Halt state is entered, something the Intel CPUs can't do, and this breaks the current implementation of do_fast_gettimeoffset() in time.c.
The mod above also ignores the Centaur C6.
The following single mod to function time_init() in time.c correctly handles both the 6x86MX and the Centaur C6 power-down features:
Replace: if (boot_cpu_data.x86_capability & 16) { ...
By:
if ((boot_cpu_data.x86_capability & 16) && (boot_cpu_data.x86_vendor != X86_VENDOR_CYRIX) && (boot_cpu_data.x86_vendor != X86_VENDOR_CENTAUR)) { ...
Regards, ------------------------ André Balsa andrebalsa@altern.org
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