debug.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <cpu/cpu.h>
#include <cpu/x86/mtrr.h>
#include <stdint.h>
 
static const char *display_mtrr_type(uint32_t type)
{
        switch (type) {
        default: return "reserved";
        case 0: return "UC";
        case 1: return "WC";
        case 4: return "WT";
        case 5: return "WP";
        case 6: return "WB";
        case 7: return "UC-";
        }
}
 
static void display_mtrr_fixed_types(uint64_t msr,
        uint32_t starting_address, uint32_t memory_size)
{
        uint32_t base_address;
        uint32_t index;
        uint32_t next_address;
        uint32_t next_type;
        uint32_t type;
 
        type = msr & MTRR_DEF_TYPE_MASK;
        base_address = starting_address;
        next_address = base_address;
        for (index = 0; index < 64; index += 8) {
                next_address = starting_address + (memory_size *
                        ((index >> 3) + 1));
                next_type = (msr >> index) & MTRR_DEF_TYPE_MASK;
                if (next_type != type) {
                        printk(BIOS_DEBUG, "    0x%08x - 0x%08x: %s\n",
                                base_address, next_address - 1,
                                display_mtrr_type(type));
                        base_address = next_address;
                        type = next_type;
                }
        }
        if (base_address != next_address)
                printk(BIOS_DEBUG, "    0x%08x - 0x%08x: %s\n",
                        base_address, next_address - 1,
                        display_mtrr_type(type));
}
 
static void display_4k_mtrr(uint32_t msr_reg, uint32_t starting_address,
        const char *name)
{
        union {
                uint64_t u64;
                msr_t s;
        } msr;
 
        msr.s = rdmsr(msr_reg);
        printk(BIOS_DEBUG, "0x%016llx: %s\n", msr.u64, name);
        display_mtrr_fixed_types(msr.u64, starting_address, 0x1000);
}
 
static void display_16k_mtrr(uint32_t msr_reg, uint32_t starting_address,
        const char *name)
{
        union {
                uint64_t u64;
                msr_t s;
        } msr;
 
        msr.s = rdmsr(msr_reg);
        printk(BIOS_DEBUG, "0x%016llx: %s\n", msr.u64, name);
        display_mtrr_fixed_types(msr.u64, starting_address, 0x4000);
}
 
static void display_64k_mtrr(void)
{
        union {
                uint64_t u64;
                msr_t s;
        } msr;
 
        msr.s = rdmsr(MTRR_FIX_64K_00000);
        printk(BIOS_DEBUG, "0x%016llx: IA32_MTRR_FIX64K_00000\n", msr.u64);
        display_mtrr_fixed_types(msr.u64, 0, 0x10000);
}
 
static void display_mtrrcap(void)
{
        msr_t msr;
 
        msr = rdmsr(MTRR_CAP_MSR);
        printk(BIOS_DEBUG,
                "0x%08x%08x: IA32_MTRRCAP: %s%s%s%s%u variable MTRRs\n",
                msr.hi, msr.lo,
                (msr.lo & MTRR_CAP_PRMRR) ? "PRMRR, " : "",
                (msr.lo & MTRR_CAP_SMRR) ? "SMRR, " : "",
                (msr.lo & MTRR_CAP_WC) ? "WC, " : "",
                (msr.lo & MTRR_CAP_FIX) ? "FIX, " : "",
                msr.lo & MTRR_CAP_VCNT);
}
 
static void display_mtrr_def_type(void)
{
        union {
                uint64_t u64;
                msr_t s;
        } msr;
 
        msr.s = rdmsr(MTRR_DEF_TYPE_MSR);
        printk(BIOS_DEBUG, "0x%016llx: IA32_MTRR_DEF_TYPE:%s%s %s\n",
                msr.u64,
                (msr.u64 & MTRR_DEF_TYPE_EN) ? " E," : "",
                (msr.u64 & MTRR_DEF_TYPE_FIX_EN) ? " FE," : "",
                display_mtrr_type((uint32_t)(msr.u64 &
                        MTRR_DEF_TYPE_MASK)));
}
 
static void display_variable_mtrr(int index, uint64_t address_mask)
{
        const uint32_t msr_reg = MTRR_PHYS_BASE(index);
        uint64_t base_address;
        uint64_t length;
        uint64_t mask;
        union {
                uint64_t u64;
                msr_t s;
        } msr_a;
        union {
                uint64_t u64;
                msr_t s;
        } msr_m;
 
        msr_a.s = rdmsr(msr_reg);
        msr_m.s = rdmsr(msr_reg + 1);
        if (msr_m.u64 & MTRR_PHYS_MASK_VALID) {
                base_address = (msr_a.u64 & 0xfffffffffffff000ULL)
                        & address_mask;
                printk(BIOS_DEBUG,
                        "0x%016llx: PHYBASE%d: Address = 0x%016llx, %s\n",
                        msr_a.u64, index, base_address,
                        display_mtrr_type(msr_a.u64 & MTRR_DEF_TYPE_MASK));
                mask = (msr_m.u64 & 0xfffffffffffff000ULL) & address_mask;
                length = (~mask & address_mask) + 1;
                printk(BIOS_DEBUG,
                        "0x%016llx: PHYMASK%d: Length  = 0x%016llx, Valid\n",
                        msr_m.u64, index, length);
        } else {
                printk(BIOS_DEBUG, "0x%016llx: PHYBASE%d\n", msr_a.u64, index);
                printk(BIOS_DEBUG, "0x%016llx: PHYMASK%d: Disabled\n",
                        msr_m.u64, index);
        }
}
 
static void _display_mtrrs(void)
{
        uint32_t address_bits;
        uint64_t address_mask;
        int i;
        int variable_mtrrs;
 
        /* Display the fixed MTRRs */
        display_mtrrcap();
        display_mtrr_def_type();
        display_64k_mtrr();
        display_16k_mtrr(MTRR_FIX_16K_80000, 0x80000, "IA32_MTRR_FIX16K_80000");
        display_16k_mtrr(MTRR_FIX_16K_A0000, 0xa0000, "IA32_MTRR_FIX16K_A0000");
        display_4k_mtrr(MTRR_FIX_4K_C0000, 0xc0000, "IA32_MTRR_FIX4K_C0000");
        display_4k_mtrr(MTRR_FIX_4K_C8000, 0xc8000, "IA32_MTRR_FIX4K_C8000");
        display_4k_mtrr(MTRR_FIX_4K_D0000, 0xd0000, "IA32_MTRR_FIX4K_D0000");
        display_4k_mtrr(MTRR_FIX_4K_D8000, 0xd8000, "IA32_MTRR_FIX4K_D8000");
        display_4k_mtrr(MTRR_FIX_4K_E0000, 0xe0000, "IA32_MTRR_FIX4K_E0000");
        display_4k_mtrr(MTRR_FIX_4K_E8000, 0xe8000, "IA32_MTRR_FIX4K_E8000");
        display_4k_mtrr(MTRR_FIX_4K_F0000, 0xf0000, "IA32_MTRR_FIX4K_F0000");
        display_4k_mtrr(MTRR_FIX_4K_F8000, 0xf8000, "IA32_MTRR_FIX4K_F8000");
        address_bits = cpu_phys_address_size();
        address_mask = (1ULL << address_bits) - 1;
 
        /* Display the variable MTRRs */
        variable_mtrrs = get_var_mtrr_count();
        for (i = 0; i < variable_mtrrs; i++)
                display_variable_mtrr(i, address_mask);
}
 
asmlinkage void display_mtrrs(void)
{
        if (CONFIG(DISPLAY_MTRRS))
                _display_mtrrs();
}