model_14_init.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <cpu/x86/msr.h>
#include <cpu/amd/msr.h>
#include <cpu/x86/mtrr.h>
#include <cpu/amd/mtrr.h>
#include <device/device.h>
#include <cpu/x86/pae.h>
#include <cpu/cpu.h>
#include <cpu/x86/cache.h>
#include <acpi/acpi.h>
#include <northbridge/amd/agesa/agesa_helper.h>
 
static void model_14_init(struct device *dev)
{
        msr_t msr;
        int msrno;
#if CONFIG(LOGICAL_CPUS)
        u32 siblings;
#endif
        printk(BIOS_DEBUG, "Model 14 Init.\n");
 
        disable_cache();
        /*
         * AGESA sets the MTRRs main MTRRs. The shadow area needs to be set
         * by coreboot.
         */
 
        /* Enable access to AMD RdDram and WrDram extension bits */
        msr = rdmsr(SYSCFG_MSR);
        msr.lo |= SYSCFG_MSR_MtrrFixDramModEn;
        msr.lo &= ~SYSCFG_MSR_MtrrFixDramEn;
        wrmsr(SYSCFG_MSR, msr);
 
        /* Set shadow WB, RdMEM, WrMEM */
        msr.lo = msr.hi = 0;
        wrmsr(MTRR_FIX_16K_A0000, msr);
        msr.lo = msr.hi = 0x1e1e1e1e;
        wrmsr(MTRR_FIX_64K_00000, msr);
        wrmsr(MTRR_FIX_16K_80000, msr);
        for (msrno = MTRR_FIX_4K_C0000; msrno <= MTRR_FIX_4K_F8000; msrno++)
                wrmsr(msrno, msr);
 
        msr = rdmsr(SYSCFG_MSR);
        msr.lo &= ~SYSCFG_MSR_MtrrFixDramModEn;
        msr.lo |= SYSCFG_MSR_MtrrFixDramEn;
        wrmsr(SYSCFG_MSR, msr);
 
        if (acpi_is_wakeup_s3())
                restore_mtrr();
 
        x86_mtrr_check();
        enable_cache();
 
        /* zero the machine check error status registers */
        mca_clear_status();
 
#if CONFIG(LOGICAL_CPUS)
        siblings = cpuid_ecx(0x80000008) & 0xff;
 
        if (siblings > 0) {
                msr = rdmsr_amd(CPU_ID_FEATURES_MSR);
                msr.lo |= 1 << 28;
                wrmsr_amd(CPU_ID_FEATURES_MSR, msr);
 
                msr = rdmsr_amd(CPU_ID_EXT_FEATURES_MSR);
                msr.hi |= 1 << (33 - 32);
                wrmsr_amd(CPU_ID_EXT_FEATURES_MSR, msr);
        }
        printk(BIOS_DEBUG, "siblings = %02d, ", siblings);
#endif
 
        /* DisableCf8ExtCfg */
        msr = rdmsr(NB_CFG_MSR);
        msr.hi &= ~(1 << (46 - 32));
        wrmsr(NB_CFG_MSR, msr);
 
        /* Write protect SMM space with SMMLOCK. */
        msr = rdmsr(HWCR_MSR);
        msr.lo |= (1 << 0);
        wrmsr(HWCR_MSR, msr);
}
 
static struct device_operations cpu_dev_ops = {
        .init = model_14_init,
};
 
static const struct cpu_device_id cpu_table[] = {
        { X86_VENDOR_AMD, 0x500f00 },   /* ON-A0 */
        { X86_VENDOR_AMD, 0x500f01 },   /* ON-A1 */
        { X86_VENDOR_AMD, 0x500f10 },   /* ON-B0 */
        { X86_VENDOR_AMD, 0x500f20 },   /* ON-C0 */
        { 0, 0 },
};
 
static const struct cpu_driver model_14 __cpu_driver = {
        .ops      = &cpu_dev_ops,
        .id_table = cpu_table,
};