/*
 * Copyright 2005-2009, Haiku, Inc.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *              Axel Dörfler, axeld@pinc-software.de
 */


#include "via.h"
#include "generic_x86.h"

#include <cpu.h>


static uint32
via_count_mtrrs(void)
{
        if (!x86_check_feature(IA32_FEATURE_MTRR, FEATURE_COMMON))
                return 0;

        // IA32_MSR_MTRR_CAPABILITIES doesn't exist on VIA CPUs
        return 8;
}


static void
via_init_mtrrs(void)
{
        generic_init_mtrrs(via_count_mtrrs());
}


static void
via_set_mtrrs(uint8 defaultType, const x86_mtrr_info* infos, uint32 count)
{
        generic_set_mtrrs(defaultType, infos, count, via_count_mtrrs());
}


static status_t
via_init(void)
{
        if (gCPU[0].arch.vendor != VENDOR_CENTAUR)
                return B_ERROR;

        // current VIA CPUs have always 36 bit (or less?)
        gPhysicalMask = ((1ULL << 36) - 1) & ~(B_PAGE_SIZE - 1);

        generic_dump_mtrrs(generic_count_mtrrs());
        return B_OK;
}


static status_t
via_stdops(int32 op, ...)
{
        switch (op) {
                case B_MODULE_INIT:
                        return via_init();
                case B_MODULE_UNINIT:
                        return B_OK;
        }

        return B_ERROR;
}


x86_cpu_module_info gVIAModule = {
        {
                "cpu/generic_x86/via/v1",
                0,
                via_stdops,
        },

        via_count_mtrrs,
        via_init_mtrrs,

        generic_set_mtrr,
        generic_get_mtrr,
        via_set_mtrrs
};