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author | Eric Biederman <ebiederm@xmission.com> | 2004-10-14 20:54:17 +0000 |
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committer | Eric Biederman <ebiederm@xmission.com> | 2004-10-14 20:54:17 +0000 |
commit | b78c1972feed4c57eebba8f94de86a91e32c3fa7 (patch) | |
tree | 2ba60cfe9866f4d1e2de1d9727d0e548139afb35 /src/arch/i386/lib/cpu.c | |
parent | cadfd4c462673bcb44cdb1f193e52c95a888762a (diff) | |
download | coreboot-b78c1972feed4c57eebba8f94de86a91e32c3fa7.tar.xz |
- First pass through with with device tree enhancement merge. Most of the mechanisms should
be in place but don't expect anything to quite work yet.
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1662 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/arch/i386/lib/cpu.c')
-rw-r--r-- | src/arch/i386/lib/cpu.c | 355 |
1 files changed, 230 insertions, 125 deletions
diff --git a/src/arch/i386/lib/cpu.c b/src/arch/i386/lib/cpu.c index 23c35bc816..74db2e81f8 100644 --- a/src/arch/i386/lib/cpu.c +++ b/src/arch/i386/lib/cpu.c @@ -1,147 +1,252 @@ #include <console/console.h> #include <cpu/cpu.h> -#include <mem.h> #include <arch/io.h> #include <string.h> -#include <cpu/cpufixup.h> -#include <smp/start_stop.h> -#include <cpu/cpufixup.h> -#include <cpu/p6/mtrr.h> -#include <cpu/p6/msr.h> -#include <cpu/p6/apic.h> -#include <cpu/p5/cpuid.h> -#include <arch/smp/lapic.h> -#if 0 -#include <cpu/l2_cache.h> -#endif - -#if CONFIG_SMP || CONFIG_IOAPIC -#define APIC 1 -#endif - - -static void cache_on(struct mem_range *mem) +#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) { - post_code(0x60); - printk_info("Enabling cache..."); - - - /* we need an #ifdef i586 here at some point ... */ - __asm__ __volatile__("mov %cr0, %eax\n\t" - "and $0x9fffffff,%eax\n\t" - "mov %eax, %cr0\n\t"); - /* turns out cache isn't really on until you set MTRR registers on - * 686 and later. - * NOTHING FANCY. Linux does a much better job anyway. - * so absolute minimum needed to get it going. - */ - /* OK, linux it turns out does nothing. We have to do it ... */ -#if i686==1 - // totalram here is in linux sizing, i.e. units of KB. - // set_mtrr is responsible for getting it into the right units! - setup_mtrrs(mem); -#endif - - post_code(0x6A); - printk_info("done.\n"); + 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; } -static void interrupts_on() + +/* Probe for the CPUID instruction */ +static int have_cpuid_p(void) { - /* this is so interrupts work. This is very limited scope -- - * linux will do better later, we hope ... - */ - /* this is the first way we learned to do it. It fails on real SMP - * stuff. So we have to do things differently ... - * see the Intel mp1.4 spec, page A-3 - */ + 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; +} -#if defined(APIC) - /* Only Pentium Pro and later have those MSR stuff */ - msr_t msr; +/* + * 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; +} - printk_info("Setting up local apic..."); +/* 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 < (sizeof(x86_vendor_name)/sizeof(x86_vendor_name[0]))) && + (x86_vendor_name[vendor] != 0)) + { + name = x86_vendor_name[vendor]; + } + return name; +} - /* Enable the local apic */ - msr = rdmsr(APIC_BASE_MSR); - msr.lo |= APIC_BASE_MSR_ENABLE; - msr.lo &= ~APIC_BASE_MSR_ADDR_MASK; - msr.lo |= APIC_DEFAULT_BASE; - wrmsr(APIC_BASE_MSR, msr); +static void identify_cpu(struct device *cpu) +{ + char vendor_name[16]; + int cpuid_level; + int i; + + vendor_name[0] = '\0'; /* Unset */ + cpuid_level = -1; /* Maximum supported CPUID level, -1=no CPUID */ + + /* 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()) { + 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 < sizeof(x86_vendors)/sizeof(x86_vendors[0]); i++) { + if (memcmp(vendor_name, x86_vendors[i].name, 12) == 0) { + cpu->vendor = x86_vendors[i].vendor; + break; + } + } +} - /* - * Set Task Priority to 'accept all'. - */ - apic_write_around(APIC_TASKPRI, - apic_read_around(APIC_TASKPRI) & ~APIC_TPRI_MASK); - - /* Put the local apic in virtual wire mode */ - apic_write_around(APIC_SPIV, - (apic_read_around(APIC_SPIV) & ~(APIC_VECTOR_MASK)) - | APIC_SPIV_ENABLE); - apic_write_around(APIC_LVT0, - (apic_read_around(APIC_LVT0) & - ~(APIC_LVT_MASKED | APIC_LVT_LEVEL_TRIGGER | - APIC_LVT_REMOTE_IRR | APIC_INPUT_POLARITY | - APIC_SEND_PENDING |APIC_LVT_RESERVED_1 | - APIC_DELIVERY_MODE_MASK)) - | (APIC_LVT_REMOTE_IRR |APIC_SEND_PENDING | - APIC_DELIVERY_MODE_EXTINT) - ); - apic_write_around(APIC_LVT1, - (apic_read_around(APIC_LVT1) & - ~(APIC_LVT_MASKED | APIC_LVT_LEVEL_TRIGGER | - APIC_LVT_REMOTE_IRR | APIC_INPUT_POLARITY | - APIC_SEND_PENDING |APIC_LVT_RESERVED_1 | - APIC_DELIVERY_MODE_MASK)) - | (APIC_LVT_REMOTE_IRR |APIC_SEND_PENDING | - APIC_DELIVERY_MODE_NMI) - ); - - printk_debug(" apic_id: %d ", lapicid()); - -#else /* APIC */ -#if i686==1 - /* Only Pentium Pro and later have those MSR stuff */ - msr_t msr; - - printk_info("Disabling local apic..."); - - msr = rdmsr(APIC_BASE_MSR); - msr.lo &= ~APIC_BASE_MSR_ENABLE; - wrmsr(APIC_BASE_MSR, msr); -#endif /* i686 */ -#endif /* APIC */ - printk_info("done.\n"); - post_code(0x9b); +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; + } + } + } + die("Unknown cpu"); + return; + found: + cpu->ops = driver->ops; } -unsigned long cpu_initialize(struct mem_range *mem) +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. */ - unsigned long processor_id = this_processors_id(); - printk_notice("Initializing CPU #%d\n", processor_id); - - /* Turn on caching if we haven't already */ - cache_on(mem); -#if i586==1 - display_cpuid(); -#endif -#if i686==1 - mtrr_check(); -#endif - - /* some cpus need a fixup done. This is the hook for doing that. */ - cpufixup(mem); - - interrupts_on(); - - processor_id = this_processors_id(); - printk_info("CPU #%d Initialized\n", processor_id); - return processor_id; + struct device *cpu; + struct cpu_info *info; + info = cpu_info(); + + printk_notice("Initializing CPU #%d\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_debug("CPU: vendor %s device %x\n", + cpu_vendor_name(cpu->vendor), cpu->device); + + /* Lookup the cpu's operations */ + set_cpu_ops(cpu); + + /* Initialize the cpu */ + if (cpu->ops && cpu->ops->init) { + cpu->enabled = 1; + cpu->initialized = 1; + cpu->ops->init(cpu); + } + + printk_info("CPU #%d Initialized\n", info->index); + return; } |