src/cpu/x86/mtrr/debug.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <cpu/cpu.h>
   5 #include <cpu/x86/msr.h>
   6 #include <cpu/x86/mtrr.h>
   7 #include <stdint.h>
   8
   9 static const char *display_mtrr_type(uint32_t type)
  10 {
  11         switch (type) {
  12         default: return "reserved";
  13         case 0: return "UC";
  14         case 1: return "WC";
  15         case 4: return "WT";
  16         case 5: return "WP";
  17         case 6: return "WB";
  18         case 7: return "UC-";
  19         }
  20 }
  21
  22 static void display_mtrr_fixed_types(msr_t msr_data,
  23         uint32_t starting_address, uint32_t memory_size)
  24 {
  25         uint32_t base_address;
  26         uint32_t index;
  27         uint32_t next_address;
  28         uint32_t next_type;
  29         uint32_t type;
  30
  31         type = msr_data.raw & MTRR_DEF_TYPE_MASK;
  32         base_address = starting_address;
  33         next_address = base_address;
  34         for (index = 0; index < 64; index += 8) {
  35                 next_address = starting_address + (memory_size *
  36                         ((index >> 3) + 1));
  37                 next_type = (msr_data.raw >> index) & MTRR_DEF_TYPE_MASK;
  38                 if (next_type != type) {
  39                         printk(BIOS_DEBUG, "    0x%08x - 0x%08x: %s\n",
  40                                 base_address, next_address - 1,
  41                                 display_mtrr_type(type));
  42                         base_address = next_address;
  43                         type = next_type;
  44                 }
  45         }
  46         if (base_address != next_address)
  47                 printk(BIOS_DEBUG, "    0x%08x - 0x%08x: %s\n",
  48                         base_address, next_address - 1,
  49                         display_mtrr_type(type));
  50 }
  51
  52 static void display_4k_mtrr(uint32_t msr_reg, uint32_t starting_address,
  53         const char *name)
  54 {
  55         const msr_t msr = rdmsr(msr_reg);
  56         printk(BIOS_DEBUG, "0x%016llx: %s\n", msr.raw, name);
  57         display_mtrr_fixed_types(msr, starting_address, 0x1000);
  58 }
  59
  60 static void display_16k_mtrr(uint32_t msr_reg, uint32_t starting_address,
  61         const char *name)
  62 {
  63         const msr_t msr = rdmsr(msr_reg);
  64         printk(BIOS_DEBUG, "0x%016llx: %s\n", msr.raw, name);
  65         display_mtrr_fixed_types(msr, starting_address, 0x4000);
  66 }
  67
  68 static void display_64k_mtrr(void)
  69 {
  70         const msr_t msr = rdmsr(MTRR_FIX_64K_00000);
  71         printk(BIOS_DEBUG, "0x%016llx: IA32_MTRR_FIX64K_00000\n", msr.raw);
  72         display_mtrr_fixed_types(msr, 0, 0x10000);
  73 }
  74
  75 static void display_mtrrcap(void)
  76 {
  77         const msr_t msr = rdmsr(MTRR_CAP_MSR);
  78         printk(BIOS_DEBUG,
  79                 "0x%08x%08x: IA32_MTRRCAP: %s%s%s%s%u variable MTRRs\n",
  80                 msr.hi, msr.lo,
  81                 (msr.lo & MTRR_CAP_PRMRR) ? "PRMRR, " : "",
  82                 (msr.lo & MTRR_CAP_SMRR) ? "SMRR, " : "",
  83                 (msr.lo & MTRR_CAP_WC) ? "WC, " : "",
  84                 (msr.lo & MTRR_CAP_FIX) ? "FIX, " : "",
  85                 msr.lo & MTRR_CAP_VCNT);
  86 }
  87
  88 static void display_mtrr_def_type(void)
  89 {
  90         const msr_t msr = rdmsr(MTRR_DEF_TYPE_MSR);
  91         printk(BIOS_DEBUG, "0x%016llx: IA32_MTRR_DEF_TYPE:%s%s %s\n",
  92                 msr.raw,
  93                 (msr.raw & MTRR_DEF_TYPE_EN) ? " E," : "",
  94                 (msr.raw & MTRR_DEF_TYPE_FIX_EN) ? " FE," : "",
  95                 display_mtrr_type((uint32_t)(msr.raw &
  96                         MTRR_DEF_TYPE_MASK)));
  97 }
  98
  99 static void display_variable_mtrr(int index, uint64_t address_mask)
 100 {
 101         uint64_t base_address;
 102         uint64_t length;
 103         uint64_t mask;
 104         const msr_t msr_base = rdmsr(MTRR_PHYS_BASE(index));
 105         const msr_t msr_mask = rdmsr(MTRR_PHYS_MASK(index));
 106
 107         if (msr_mask.raw & MTRR_PHYS_MASK_VALID) {
 108                 base_address = (msr_base.raw & 0xfffffffffffff000ULL)
 109                         & address_mask;
 110                 printk(BIOS_DEBUG,
 111                         "0x%016llx: PHYBASE%d: Address = 0x%016llx, %s\n",
 112                         msr_base.raw, index, base_address,
 113                         display_mtrr_type(msr_base.raw & MTRR_DEF_TYPE_MASK));
 114                 mask = (msr_mask.raw & 0xfffffffffffff000ULL) & address_mask;
 115                 length = (~mask & address_mask) + 1;
 116                 printk(BIOS_DEBUG,
 117                         "0x%016llx: PHYMASK%d: Length  = 0x%016llx, Valid\n",
 118                         msr_mask.raw, index, length);
 119         } else {
 120                 printk(BIOS_DEBUG, "0x%016llx: PHYBASE%d\n", msr_base.raw, index);
 121                 printk(BIOS_DEBUG, "0x%016llx: PHYMASK%d: Disabled\n",
 122                         msr_mask.raw, index);
 123         }
 124 }
 125
 126 static void _display_mtrrs(void)
 127 {
 128         uint32_t address_bits;
 129         uint64_t address_mask;
 130         int i;
 131         int variable_mtrrs;
 132
 133         /* Display the fixed MTRRs */
 134         display_mtrrcap();
 135         display_mtrr_def_type();
 136         display_64k_mtrr();
 137         display_16k_mtrr(MTRR_FIX_16K_80000, 0x80000, "IA32_MTRR_FIX16K_80000");
 138         display_16k_mtrr(MTRR_FIX_16K_A0000, 0xa0000, "IA32_MTRR_FIX16K_A0000");
 139         display_4k_mtrr(MTRR_FIX_4K_C0000, 0xc0000, "IA32_MTRR_FIX4K_C0000");
 140         display_4k_mtrr(MTRR_FIX_4K_C8000, 0xc8000, "IA32_MTRR_FIX4K_C8000");
 141         display_4k_mtrr(MTRR_FIX_4K_D0000, 0xd0000, "IA32_MTRR_FIX4K_D0000");
 142         display_4k_mtrr(MTRR_FIX_4K_D8000, 0xd8000, "IA32_MTRR_FIX4K_D8000");
 143         display_4k_mtrr(MTRR_FIX_4K_E0000, 0xe0000, "IA32_MTRR_FIX4K_E0000");
 144         display_4k_mtrr(MTRR_FIX_4K_E8000, 0xe8000, "IA32_MTRR_FIX4K_E8000");
 145         display_4k_mtrr(MTRR_FIX_4K_F0000, 0xf0000, "IA32_MTRR_FIX4K_F0000");
 146         display_4k_mtrr(MTRR_FIX_4K_F8000, 0xf8000, "IA32_MTRR_FIX4K_F8000");
 147         address_bits = cpu_phys_address_size();
 148         address_mask = (1ULL << address_bits) - 1;
 149
 150         /* Display the variable MTRRs */
 151         variable_mtrrs = get_var_mtrr_count();
 152         for (i = 0; i < variable_mtrrs; i++)
 153                 display_variable_mtrr(i, address_mask);
 154 }
 155
 156 asmlinkage void display_mtrrs(void)
 157 {
 158         if (CONFIG(DISPLAY_MTRRS))
 159                 _display_mtrrs();
 160 }