Differential D35799 Diff 111904 sys/x86/x86/mptable.c

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sys/x86/x86/mptable.c

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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.		* SUCH DAMAGE.
*/		*/

#include <sys/cdefs.h>		#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");		__FBSDID("$FreeBSD$");

#include "opt_mptable_force_htt.h"		#include "opt_mptable_force_htt.h"
		#include "opt_mptable_linux_bug_compat.h"
#include <sys/param.h>		#include <sys/param.h>
#include <sys/systm.h>		#include <sys/systm.h>
#include <sys/bus.h>		#include <sys/bus.h>
#include <sys/kernel.h>		#include <sys/kernel.h>
#include <sys/limits.h>		#include <sys/limits.h>
#include <sys/malloc.h>		#include <sys/malloc.h>
#include <sys/smp.h>		#include <sys/smp.h>
#ifdef NEW_PCIB		#ifdef NEW_PCIB
▲ Show 20 Lines • Show All 199 Lines • ▼ Show 20 Lines	lookup_bus_type(char *name)

for (x = 0; x < MAX_BUSTYPE; ++x)		for (x = 0; x < MAX_BUSTYPE; ++x)
if (strncmp(bus_type_table[x].name, name, 6) == 0)		if (strncmp(bus_type_table[x].name, name, 6) == 0)
return (bus_type_table[x].type);		return (bus_type_table[x].type);

return (UNKNOWN_BUSTYPE);		return (UNKNOWN_BUSTYPE);
}		}

		#ifdef MPTABLE_LINUX_BUG_COMPAT
		/* Compute the correct entry_count value. */
		static void
		compute_entry_count(void)
		{
		u_char end = (u_char )(mpct) + mpct->base_table_length;
		u_char entry = (u_char )(mpct + 1);
		size_t nentries = 0;

		while (entry < end) {
		switch (*entry) {
		case MPCT_ENTRY_PROCESSOR:
		case MPCT_ENTRY_IOAPIC:
		case MPCT_ENTRY_BUS:
		case MPCT_ENTRY_INT:
		case MPCT_ENTRY_LOCAL_INT:
		break;
		default:
		panic("%s: Unknown MP Config Entry %d\n", __func__,
		(int)*entry);
		}
		entry += basetable_entry_types[*entry].length;
		nentries++;
		}
		mpct->entry_count = (uint16_t)(nentries);
		}
		#endif

/*		/*
* Look for an Intel MP spec table (ie, SMP capable hardware).		* Look for an Intel MP spec table (ie, SMP capable hardware).
*/		*/
static int		static int
mptable_probe(void)		mptable_probe(void)
{		{
int x;		int x;
u_long segment;		u_long segment;
Show All 12 Lines	if ((x = search_for_sig(target, 1024 / 4)) >= 0)
goto found;		goto found;
}		}

/* search the BIOS */		/* search the BIOS */
target = (u_int32_t) BIOS_BASE;		target = (u_int32_t) BIOS_BASE;
if ((x = search_for_sig(target, BIOS_COUNT)) >= 0)		if ((x = search_for_sig(target, BIOS_COUNT)) >= 0)
goto found;		goto found;

		#ifdef MPTABLE_LINUX_BUG_COMPAT
		/*
		* Linux assumes that it always has 640 kB of base memory and
		* searches for the MP table at 639k regardless of whether that
		* address is present in the system memory map. Some VM systems
		* rely on this buggy behaviour.
		*/
		if ((x = search_for_sig(639 * 1024, 1024 / 4)) >= 0)
		goto found;
		#endif

/* nothing found */		/* nothing found */
return (ENXIO);		return (ENXIO);

found:		found:
mpfps = (mpfps_t)BIOS_PADDRTOVADDR(x);		mpfps = (mpfps_t)BIOS_PADDRTOVADDR(x);

/* Map in the configuration table if it exists. */		/* Map in the configuration table if it exists. */
if (mpfps->config_type != 0) {		if (mpfps->config_type != 0) {
Show All 32 Lines	if (mpct->signature[0] != 'P' \|\| mpct->signature[1] != 'C' \|\|
__func__, mpct->signature[0], mpct->signature[1],		__func__, mpct->signature[0], mpct->signature[1],
mpct->signature[2], mpct->signature[3]);		mpct->signature[2], mpct->signature[3]);
return (ENXIO);		return (ENXIO);
}		}
if (bootverbose)		if (bootverbose)
printf(		printf(
"MP Configuration Table version 1.%d found at %p\n",		"MP Configuration Table version 1.%d found at %p\n",
mpct->spec_rev, mpct);		mpct->spec_rev, mpct);
		#ifdef MPTABLE_LINUX_BUG_COMPAT
		/*
		* Linux ignores entry_count and instead scans the MP table
		* until it runs out of bytes of table (as specified by the
		* base_table_length field). Some VM systems rely on this
		* buggy behaviour and record an entry_count of zero.
		*/
		if (mpct->entry_count == 0)
		compute_entry_count();
		#endif
}		}

return (-100);		return (-100);
}		}

/*		/*
* Run through the MP table enumerating CPUs.		* Run through the MP table enumerating CPUs.
*/		*/
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