| #include <console/console.h> |
| #include <cpu/cpu.h> |
| #include <arch/io.h> |
| #include <string.h> |
| #include <cpu/x86/mtrr.h> |
| #include <cpu/x86/msr.h> |
| #include <cpu/x86/lapic.h> |
| #include <arch/cpu.h> |
| #include <device/path.h> |
| #include <device/device.h> |
| #include <smp/spinlock.h> |
| |
| /* Standard macro to see if a specific flag is changeable */ |
| static inline int flag_is_changeable_p(uint32_t flag) |
| { |
| uint32_t f1, f2; |
| |
| asm( |
| "pushfl\n\t" |
| "pushfl\n\t" |
| "popl %0\n\t" |
| "movl %0,%1\n\t" |
| "xorl %2,%0\n\t" |
| "pushl %0\n\t" |
| "popfl\n\t" |
| "pushfl\n\t" |
| "popl %0\n\t" |
| "popfl\n\t" |
| : "=&r" (f1), "=&r" (f2) |
| : "ir" (flag)); |
| return ((f1^f2) & flag) != 0; |
| } |
| |
| |
| /* Probe for the CPUID instruction */ |
| static int have_cpuid_p(void) |
| { |
| return flag_is_changeable_p(X86_EFLAGS_ID); |
| } |
| |
| /* |
| * Cyrix CPUs without cpuid or with cpuid not yet enabled can be detected |
| * by the fact that they preserve the flags across the division of 5/2. |
| * PII and PPro exhibit this behavior too, but they have cpuid available. |
| */ |
| |
| /* |
| * Perform the Cyrix 5/2 test. A Cyrix won't change |
| * the flags, while other 486 chips will. |
| */ |
| static inline int test_cyrix_52div(void) |
| { |
| unsigned int test; |
| |
| __asm__ __volatile__( |
| "sahf\n\t" /* clear flags (%eax = 0x0005) */ |
| "div %b2\n\t" /* divide 5 by 2 */ |
| "lahf" /* store flags into %ah */ |
| : "=a" (test) |
| : "0" (5), "q" (2) |
| : "cc"); |
| |
| /* AH is 0x02 on Cyrix after the divide.. */ |
| return (unsigned char) (test >> 8) == 0x02; |
| } |
| |
| /* |
| * Detect a NexGen CPU running without BIOS hypercode new enough |
| * to have CPUID. (Thanks to Herbert Oppmann) |
| */ |
| |
| static int deep_magic_nexgen_probe(void) |
| { |
| int ret; |
| |
| __asm__ __volatile__ ( |
| " movw $0x5555, %%ax\n" |
| " xorw %%dx,%%dx\n" |
| " movw $2, %%cx\n" |
| " divw %%cx\n" |
| " movl $0, %%eax\n" |
| " jnz 1f\n" |
| " movl $1, %%eax\n" |
| "1:\n" |
| : "=a" (ret) : : "cx", "dx" ); |
| return ret; |
| } |
| |
| /* List of cpu vendor strings along with their normalized |
| * id values. |
| */ |
| static struct { |
| int vendor; |
| const char *name; |
| } x86_vendors[] = { |
| { X86_VENDOR_INTEL, "GenuineIntel", }, |
| { X86_VENDOR_CYRIX, "CyrixInstead", }, |
| { X86_VENDOR_AMD, "AuthenticAMD", }, |
| { X86_VENDOR_UMC, "UMC UMC UMC ", }, |
| { X86_VENDOR_NEXGEN, "NexGenDriven", }, |
| { X86_VENDOR_CENTAUR, "CentaurHauls", }, |
| { X86_VENDOR_RISE, "RiseRiseRise", }, |
| { X86_VENDOR_TRANSMETA, "GenuineTMx86", }, |
| { X86_VENDOR_TRANSMETA, "TransmetaCPU", }, |
| { X86_VENDOR_NSC, "Geode by NSC", }, |
| { X86_VENDOR_SIS, "SiS SiS SiS ", }, |
| }; |
| |
| static const char *x86_vendor_name[] = { |
| [X86_VENDOR_INTEL] = "Intel", |
| [X86_VENDOR_CYRIX] = "Cyrix", |
| [X86_VENDOR_AMD] = "AMD", |
| [X86_VENDOR_UMC] = "UMC", |
| [X86_VENDOR_NEXGEN] = "NexGen", |
| [X86_VENDOR_CENTAUR] = "Centaur", |
| [X86_VENDOR_RISE] = "Rise", |
| [X86_VENDOR_TRANSMETA] = "Transmeta", |
| [X86_VENDOR_NSC] = "NSC", |
| [X86_VENDOR_SIS] = "SiS", |
| }; |
| |
| static const char *cpu_vendor_name(int vendor) |
| { |
| const char *name; |
| name = "<invalid cpu vendor>"; |
| if ((vendor < (ARRAY_SIZE(x86_vendor_name))) && |
| (x86_vendor_name[vendor] != 0)) |
| { |
| name = x86_vendor_name[vendor]; |
| } |
| return name; |
| } |
| |
| static int cpu_cpuid_extended_level(void) |
| { |
| return cpuid_eax(0x80000000); |
| } |
| |
| #define CPUID_FEATURE_PAE (1 << 6) |
| #define CPUID_FEATURE_PSE36 (1 << 17) |
| |
| int cpu_phys_address_size(void) |
| { |
| if (!(have_cpuid_p())) |
| return 32; |
| |
| if (cpu_cpuid_extended_level() > 0x80000008) |
| return cpuid_eax(0x80000008) & 0xff; |
| |
| if (cpuid_eax(1) & (CPUID_FEATURE_PAE | CPUID_FEATURE_PSE36)) |
| return 36; |
| return 32; |
| } |
| static void identify_cpu(struct device *cpu) |
| { |
| char vendor_name[16]; |
| int i; |
| |
| vendor_name[0] = '\0'; /* Unset */ |
| |
| /* Find the id and vendor_name */ |
| if (!have_cpuid_p()) { |
| /* Its a 486 if we can modify the AC flag */ |
| if (flag_is_changeable_p(X86_EFLAGS_AC)) { |
| cpu->device = 0x00000400; /* 486 */ |
| } else { |
| cpu->device = 0x00000300; /* 386 */ |
| } |
| if ((cpu->device == 0x00000400) && test_cyrix_52div()) { |
| memcpy(vendor_name, "CyrixInstead", 13); |
| /* If we ever care we can enable cpuid here */ |
| } |
| /* Detect NexGen with old hypercode */ |
| else if (deep_magic_nexgen_probe()) { |
| memcpy(vendor_name, "NexGenDriven", 13); |
| } |
| } |
| if (have_cpuid_p()) { |
| int cpuid_level; |
| struct cpuid_result result; |
| result = cpuid(0x00000000); |
| cpuid_level = result.eax; |
| vendor_name[ 0] = (result.ebx >> 0) & 0xff; |
| vendor_name[ 1] = (result.ebx >> 8) & 0xff; |
| vendor_name[ 2] = (result.ebx >> 16) & 0xff; |
| vendor_name[ 3] = (result.ebx >> 24) & 0xff; |
| vendor_name[ 4] = (result.edx >> 0) & 0xff; |
| vendor_name[ 5] = (result.edx >> 8) & 0xff; |
| vendor_name[ 6] = (result.edx >> 16) & 0xff; |
| vendor_name[ 7] = (result.edx >> 24) & 0xff; |
| vendor_name[ 8] = (result.ecx >> 0) & 0xff; |
| vendor_name[ 9] = (result.ecx >> 8) & 0xff; |
| vendor_name[10] = (result.ecx >> 16) & 0xff; |
| vendor_name[11] = (result.ecx >> 24) & 0xff; |
| vendor_name[12] = '\0'; |
| |
| /* Intel-defined flags: level 0x00000001 */ |
| if (cpuid_level >= 0x00000001) { |
| cpu->device = cpuid_eax(0x00000001); |
| } |
| else { |
| /* Have CPUID level 0 only unheard of */ |
| cpu->device = 0x00000400; |
| } |
| } |
| cpu->vendor = X86_VENDOR_UNKNOWN; |
| for(i = 0; i < ARRAY_SIZE(x86_vendors); i++) { |
| if (memcmp(vendor_name, x86_vendors[i].name, 12) == 0) { |
| cpu->vendor = x86_vendors[i].vendor; |
| break; |
| } |
| } |
| } |
| |
| static void set_cpu_ops(struct device *cpu) |
| { |
| struct cpu_driver *driver; |
| cpu->ops = 0; |
| for (driver = cpu_drivers; driver < ecpu_drivers; driver++) { |
| struct cpu_device_id *id; |
| for(id = driver->id_table; id->vendor != X86_VENDOR_INVALID; id++) { |
| if ((cpu->vendor == id->vendor) && |
| (cpu->device == id->device)) |
| { |
| goto found; |
| } |
| } |
| } |
| return; |
| found: |
| cpu->ops = driver->ops; |
| } |
| |
| void cpu_initialize(void) |
| { |
| /* Because we busy wait at the printk spinlock. |
| * It is important to keep the number of printed messages |
| * from secondary cpus to a minimum, when debugging is |
| * disabled. |
| */ |
| struct device *cpu; |
| struct cpu_info *info; |
| struct cpuinfo_x86 c; |
| |
| info = cpu_info(); |
| |
| printk(BIOS_INFO, "Initializing CPU #%ld\n", info->index); |
| |
| cpu = info->cpu; |
| if (!cpu) { |
| die("CPU: missing cpu device structure"); |
| } |
| |
| /* Find what type of cpu we are dealing with */ |
| identify_cpu(cpu); |
| printk(BIOS_DEBUG, "CPU: vendor %s device %x\n", |
| cpu_vendor_name(cpu->vendor), cpu->device); |
| |
| get_fms(&c, cpu->device); |
| |
| printk(BIOS_DEBUG, "CPU: family %02x, model %02x, stepping %02x\n", |
| c.x86, c.x86_model, c.x86_mask); |
| |
| /* Lookup the cpu's operations */ |
| set_cpu_ops(cpu); |
| |
| if(!cpu->ops) { |
| /* mask out the stepping and try again */ |
| cpu->device -= c.x86_mask; |
| set_cpu_ops(cpu); |
| cpu->device += c.x86_mask; |
| if(!cpu->ops) die("Unknown cpu"); |
| printk(BIOS_DEBUG, "Using generic cpu ops (good)\n"); |
| } |
| |
| |
| /* Initialize the cpu */ |
| if (cpu->ops && cpu->ops->init) { |
| cpu->enabled = 1; |
| cpu->initialized = 1; |
| cpu->ops->init(cpu); |
| } |
| |
| printk(BIOS_INFO, "CPU #%ld initialized\n", info->index); |
| |
| return; |
| } |
| |