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/*
 * mp_tables.c: Dynamically writes MP table info into the ROMBIOS.
 *
 * In order to work with various VCPU counts, this code reads the VCPU count
 * for the HVM partition and creates the correct MP tables for the VCPU count
 * and places the information into a predetermined location set aside in the
 * ROMBIOS during build time.
 *
 * Please note that many of the values, such as the CPU's
 * family/model/stepping, are hard-coded based upon the values that were used
 * in the ROMBIOS and may need to be modified or calculated dynamically to
 * correspond with what an HVM guest's CPUID returns.
 *
 * Travis Betak, travis.betak@amd.com
 * Copyright (c) 2006, AMD.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 */

#include <stdint.h>
#include "config.h"

/* number of non-processor MP table entries */
#define NR_NONPROC_ENTRIES     18

#define ENTRY_TYPE_PROCESSOR   0
#define ENTRY_TYPE_BUS         1
#define ENTRY_TYPE_IOAPIC      2
#define ENTRY_TYPE_IO_INTR     3
#define ENTRY_TYPE_LOCAL_INTR  4

#define CPU_FLAG_ENABLED       0x01
#define CPU_FLAG_BSP           0x02

/* TODO change this to correspond with what the guest's see's from CPUID */
#define CPU_SIG_FAMILY         0x06
#define CPU_SIG_MODEL          0x00
#define CPU_SIG_STEPPING       0x00
#define CPU_SIGNATURE        ((CPU_SIG_FAMILY << 8)  \
                             | (CPU_SIG_MODEL << 4)  \
                             | (CPU_SIG_STEPPING))
#define CPU_FEATURE_FPU       (1U << 0)
#define CPU_FEATURE_MCE       (1U << 7)
#define CPU_FEATURE_CX8       (1U << 8)
#define CPU_FEATURE_APIC      (1U << 9)
#define CPU_FEATURES          (CPU_FEATURE_FPU | CPU_FEATURE_APIC)

#define BUS_TYPE_LENGTH        6
#define BUS_TYPE_STR_ISA       "ISA   "
#define BUS_ID_ISA             0

#define INTR_TYPE_INT          0
#define INTR_TYPE_NMI          1
#define INTR_TYPE_SMI          2
#define INTR_TYPE_EXTINT       3

#define INTR_MAX_NR            16

#include "util.h"

extern int get_vcpu_nr(void);  /* for the guest's VCPU count */

/*
 * The following structures are defined in the MuliProcessor Specifiation v1.4
 */

/* MP Floating Pointer Structure */
struct mp_floating_pointer_struct {
    uint8_t signature[4];
    uint32_t mp_table;
    uint8_t length;
    uint8_t revision;
    uint8_t checksum;
    uint8_t feature[5];
};

/* MP Configuration Table */
struct mp_config_table {
    uint8_t signature[4];
    uint16_t length;
    uint8_t revision;
    uint8_t checksum;
    uint8_t oem_id[8];
    uint8_t vendor_id[12];
    uint32_t oem_table;
    uint16_t oem_table_sz;
    uint16_t nr_entries;
    uint32_t lapic;
    uint16_t extended_length;
    uint8_t extended_checksum;
    uint8_t reserved;
};

/* MP Processor Entry */
struct mp_proc_entry {
    uint8_t type;
    uint8_t lapic_id;
    uint8_t lapic_version;
    uint8_t cpu_flags;
    uint32_t cpu_signature;
    uint32_t feature_flags;
    uint8_t reserved[8];
};

/* MP Bus Entry */
struct mp_bus_entry {
    uint8_t type;
    uint8_t bus_id;
    uint8_t bus_type_str[6];
};

/* MP IOAPIC Entry */
struct mp_ioapic_entry {
    uint8_t type;
    uint8_t ioapic_id;
    uint8_t ioapic_version;
    uint8_t ioapic_flags;
    uint32_t ioapic_addr;
};

/* MP IO Interrupt Entry */
struct mp_io_intr_entry {
    uint8_t type;
    uint8_t intr_type;
    uint16_t io_intr_flags;
    uint8_t src_bus_id;
    uint8_t src_bus_irq;
    uint8_t dst_ioapic_id;
    uint8_t dst_ioapic_intin;
};

/* MP Local Interrupt Entry */
struct mp_local_intr_entry {
    uint8_t type;
    uint8_t intr_type;
    uint16_t local_intr_flags;
    uint8_t src_bus_id;
    uint8_t src_bus_irq;
    uint8_t dst_lapic_id;
    uint8_t dst_lapic_lintin;
};


void fill_mp_config_table(struct mp_config_table *mpct, int length)
{
    int vcpu_nr, i;
    uint8_t checksum;

    vcpu_nr = get_vcpu_nr();

    /* fill in the MP configuration table signature, "PCMP" */
    mpct->signature[0] = 'P';
    mpct->signature[1] = 'C';
    mpct->signature[2] = 'M';
    mpct->signature[3] = 'P';

    mpct->length = length;

    mpct->revision = 4;

    /* fill in the OEM ID string, "_HVMCPU_" */
    mpct->oem_id[0] = '_'; mpct->oem_id[3] = 'M'; mpct->oem_id[6] = 'U';
    mpct->oem_id[1] = 'H'; mpct->oem_id[4] = 'C'; mpct->oem_id[7] = '_';
    mpct->oem_id[2] = 'V'; mpct->oem_id[5] = 'P';

    /* fill in the Vendor ID string, "XEN         " */
    mpct->vendor_id[0] = 'X'; mpct->vendor_id[6] =  ' ';
    mpct->vendor_id[1] = 'E'; mpct->vendor_id[7] =  ' ';
    mpct->vendor_id[2] = 'N'; mpct->vendor_id[8] =  ' ';
    mpct->vendor_id[3] = ' '; mpct->vendor_id[9] =  ' ';
    mpct->vendor_id[4] = ' '; mpct->vendor_id[10] = ' ';
    mpct->vendor_id[5] = ' '; mpct->vendor_id[11] = ' ';

    mpct->oem_table = 0;
    mpct->oem_table_sz = 0;

    mpct->nr_entries = vcpu_nr + NR_NONPROC_ENTRIES;

    mpct->lapic = LAPIC_BASE_ADDRESS;
    mpct->extended_length = 0;
    mpct->extended_checksum = 0;

    /* Finally, fill in the checksum. */
    mpct->checksum = checksum = 0;
    for ( i = 0; i < length; i++ )