17bddac94SSimon Glass /* 27bddac94SSimon Glass * Copyright (c) 2014 The Chromium OS Authors. 37bddac94SSimon Glass * 452f952bfSBin Meng * Part of this file is adapted from coreboot 552f952bfSBin Meng * src/arch/x86/include/arch/cpu.h and 652f952bfSBin Meng * src/arch/x86/lib/cpu.c 752f952bfSBin Meng * 87bddac94SSimon Glass * SPDX-License-Identifier: GPL-2.0+ 97bddac94SSimon Glass */ 107bddac94SSimon Glass 1152f952bfSBin Meng #ifndef _ASM_CPU_H 1252f952bfSBin Meng #define _ASM_CPU_H 1352f952bfSBin Meng 1452f952bfSBin Meng enum { 1552f952bfSBin Meng X86_VENDOR_INVALID = 0, 1652f952bfSBin Meng X86_VENDOR_INTEL, 1752f952bfSBin Meng X86_VENDOR_CYRIX, 1852f952bfSBin Meng X86_VENDOR_AMD, 1952f952bfSBin Meng X86_VENDOR_UMC, 2052f952bfSBin Meng X86_VENDOR_NEXGEN, 2152f952bfSBin Meng X86_VENDOR_CENTAUR, 2252f952bfSBin Meng X86_VENDOR_RISE, 2352f952bfSBin Meng X86_VENDOR_TRANSMETA, 2452f952bfSBin Meng X86_VENDOR_NSC, 2552f952bfSBin Meng X86_VENDOR_SIS, 2652f952bfSBin Meng X86_VENDOR_ANY = 0xfe, 2752f952bfSBin Meng X86_VENDOR_UNKNOWN = 0xff 2852f952bfSBin Meng }; 2952f952bfSBin Meng 307dfe8bdeSSimon Glass /* Global descriptor table (GDT) bits */ 317dfe8bdeSSimon Glass enum { 327dfe8bdeSSimon Glass GDT_4KB = 1ULL << 55, 337dfe8bdeSSimon Glass GDT_32BIT = 1ULL << 54, 347dfe8bdeSSimon Glass GDT_LONG = 1ULL << 53, 357dfe8bdeSSimon Glass GDT_PRESENT = 1ULL << 47, 367dfe8bdeSSimon Glass GDT_NOTSYS = 1ULL << 44, 377dfe8bdeSSimon Glass GDT_CODE = 1ULL << 43, 387dfe8bdeSSimon Glass GDT_LIMIT_LOW_SHIFT = 0, 397dfe8bdeSSimon Glass GDT_LIMIT_LOW_MASK = 0xffff, 407dfe8bdeSSimon Glass GDT_LIMIT_HIGH_SHIFT = 48, 417dfe8bdeSSimon Glass GDT_LIMIT_HIGH_MASK = 0xf, 427dfe8bdeSSimon Glass GDT_BASE_LOW_SHIFT = 16, 437dfe8bdeSSimon Glass GDT_BASE_LOW_MASK = 0xffff, 447dfe8bdeSSimon Glass GDT_BASE_HIGH_SHIFT = 56, 457dfe8bdeSSimon Glass GDT_BASE_HIGH_MASK = 0xf, 467dfe8bdeSSimon Glass }; 477dfe8bdeSSimon Glass 4852f952bfSBin Meng struct cpuid_result { 4952f952bfSBin Meng uint32_t eax; 5052f952bfSBin Meng uint32_t ebx; 5152f952bfSBin Meng uint32_t ecx; 5252f952bfSBin Meng uint32_t edx; 5352f952bfSBin Meng }; 5452f952bfSBin Meng 5552f952bfSBin Meng /* 5652f952bfSBin Meng * Generic CPUID function 5752f952bfSBin Meng */ 5852f952bfSBin Meng static inline struct cpuid_result cpuid(int op) 5952f952bfSBin Meng { 6052f952bfSBin Meng struct cpuid_result result; 6152f952bfSBin Meng asm volatile( 6252f952bfSBin Meng "mov %%ebx, %%edi;" 6352f952bfSBin Meng "cpuid;" 6452f952bfSBin Meng "mov %%ebx, %%esi;" 6552f952bfSBin Meng "mov %%edi, %%ebx;" 6652f952bfSBin Meng : "=a" (result.eax), 6752f952bfSBin Meng "=S" (result.ebx), 6852f952bfSBin Meng "=c" (result.ecx), 6952f952bfSBin Meng "=d" (result.edx) 7052f952bfSBin Meng : "0" (op) 7152f952bfSBin Meng : "edi"); 7252f952bfSBin Meng return result; 7352f952bfSBin Meng } 7452f952bfSBin Meng 7552f952bfSBin Meng /* 7652f952bfSBin Meng * Generic Extended CPUID function 7752f952bfSBin Meng */ 7852f952bfSBin Meng static inline struct cpuid_result cpuid_ext(int op, unsigned ecx) 7952f952bfSBin Meng { 8052f952bfSBin Meng struct cpuid_result result; 8152f952bfSBin Meng asm volatile( 8252f952bfSBin Meng "mov %%ebx, %%edi;" 8352f952bfSBin Meng "cpuid;" 8452f952bfSBin Meng "mov %%ebx, %%esi;" 8552f952bfSBin Meng "mov %%edi, %%ebx;" 8652f952bfSBin Meng : "=a" (result.eax), 8752f952bfSBin Meng "=S" (result.ebx), 8852f952bfSBin Meng "=c" (result.ecx), 8952f952bfSBin Meng "=d" (result.edx) 9052f952bfSBin Meng : "0" (op), "2" (ecx) 9152f952bfSBin Meng : "edi"); 9252f952bfSBin Meng return result; 9352f952bfSBin Meng } 9452f952bfSBin Meng 9552f952bfSBin Meng /* 9652f952bfSBin Meng * CPUID functions returning a single datum 9752f952bfSBin Meng */ 9852f952bfSBin Meng static inline unsigned int cpuid_eax(unsigned int op) 9952f952bfSBin Meng { 10052f952bfSBin Meng unsigned int eax; 10152f952bfSBin Meng 10252f952bfSBin Meng __asm__("mov %%ebx, %%edi;" 10352f952bfSBin Meng "cpuid;" 10452f952bfSBin Meng "mov %%edi, %%ebx;" 10552f952bfSBin Meng : "=a" (eax) 10652f952bfSBin Meng : "0" (op) 10752f952bfSBin Meng : "ecx", "edx", "edi"); 10852f952bfSBin Meng return eax; 10952f952bfSBin Meng } 11052f952bfSBin Meng 11152f952bfSBin Meng static inline unsigned int cpuid_ebx(unsigned int op) 11252f952bfSBin Meng { 11352f952bfSBin Meng unsigned int eax, ebx; 11452f952bfSBin Meng 11552f952bfSBin Meng __asm__("mov %%ebx, %%edi;" 11652f952bfSBin Meng "cpuid;" 11752f952bfSBin Meng "mov %%ebx, %%esi;" 11852f952bfSBin Meng "mov %%edi, %%ebx;" 11952f952bfSBin Meng : "=a" (eax), "=S" (ebx) 12052f952bfSBin Meng : "0" (op) 12152f952bfSBin Meng : "ecx", "edx", "edi"); 12252f952bfSBin Meng return ebx; 12352f952bfSBin Meng } 12452f952bfSBin Meng 12552f952bfSBin Meng static inline unsigned int cpuid_ecx(unsigned int op) 12652f952bfSBin Meng { 12752f952bfSBin Meng unsigned int eax, ecx; 12852f952bfSBin Meng 12952f952bfSBin Meng __asm__("mov %%ebx, %%edi;" 13052f952bfSBin Meng "cpuid;" 13152f952bfSBin Meng "mov %%edi, %%ebx;" 13252f952bfSBin Meng : "=a" (eax), "=c" (ecx) 13352f952bfSBin Meng : "0" (op) 13452f952bfSBin Meng : "edx", "edi"); 13552f952bfSBin Meng return ecx; 13652f952bfSBin Meng } 13752f952bfSBin Meng 13852f952bfSBin Meng static inline unsigned int cpuid_edx(unsigned int op) 13952f952bfSBin Meng { 14052f952bfSBin Meng unsigned int eax, edx; 14152f952bfSBin Meng 14252f952bfSBin Meng __asm__("mov %%ebx, %%edi;" 14352f952bfSBin Meng "cpuid;" 14452f952bfSBin Meng "mov %%edi, %%ebx;" 14552f952bfSBin Meng : "=a" (eax), "=d" (edx) 14652f952bfSBin Meng : "0" (op) 14752f952bfSBin Meng : "ecx", "edi"); 14852f952bfSBin Meng return edx; 14952f952bfSBin Meng } 15052f952bfSBin Meng 15152f952bfSBin Meng /* Standard macro to see if a specific flag is changeable */ 15252f952bfSBin Meng static inline int flag_is_changeable_p(uint32_t flag) 15352f952bfSBin Meng { 15452f952bfSBin Meng uint32_t f1, f2; 15552f952bfSBin Meng 15652f952bfSBin Meng asm( 15752f952bfSBin Meng "pushfl\n\t" 15852f952bfSBin Meng "pushfl\n\t" 15952f952bfSBin Meng "popl %0\n\t" 16052f952bfSBin Meng "movl %0,%1\n\t" 16152f952bfSBin Meng "xorl %2,%0\n\t" 16252f952bfSBin Meng "pushl %0\n\t" 16352f952bfSBin Meng "popfl\n\t" 16452f952bfSBin Meng "pushfl\n\t" 16552f952bfSBin Meng "popl %0\n\t" 16652f952bfSBin Meng "popfl\n\t" 16752f952bfSBin Meng : "=&r" (f1), "=&r" (f2) 16852f952bfSBin Meng : "ir" (flag)); 16952f952bfSBin Meng return ((f1^f2) & flag) != 0; 17052f952bfSBin Meng } 1717bddac94SSimon Glass 172837a136fSSimon Glass static inline void mfence(void) 173837a136fSSimon Glass { 174837a136fSSimon Glass __asm__ __volatile__("mfence" : : : "memory"); 175837a136fSSimon Glass } 176837a136fSSimon Glass 1777bddac94SSimon Glass /** 1787bddac94SSimon Glass * cpu_enable_paging_pae() - Enable PAE-paging 1797bddac94SSimon Glass * 18052f952bfSBin Meng * @cr3: Value to set in cr3 (PDPT or PML4T) 1817bddac94SSimon Glass */ 1827bddac94SSimon Glass void cpu_enable_paging_pae(ulong cr3); 1837bddac94SSimon Glass 1847bddac94SSimon Glass /** 1857bddac94SSimon Glass * cpu_disable_paging_pae() - Disable paging and PAE 1867bddac94SSimon Glass */ 1877bddac94SSimon Glass void cpu_disable_paging_pae(void); 1887bddac94SSimon Glass 18992cc94a1SSimon Glass /** 19092cc94a1SSimon Glass * cpu_has_64bit() - Check if the CPU has 64-bit support 19192cc94a1SSimon Glass * 19292cc94a1SSimon Glass * @return 1 if this CPU supports long mode (64-bit), 0 if not 19392cc94a1SSimon Glass */ 19492cc94a1SSimon Glass int cpu_has_64bit(void); 19592cc94a1SSimon Glass 196200182a7SSimon Glass /** 19752f952bfSBin Meng * cpu_vendor_name() - Get CPU vendor name 19852f952bfSBin Meng * 19952f952bfSBin Meng * @vendor: CPU vendor enumeration number 20052f952bfSBin Meng * 20152f952bfSBin Meng * @return: Address to hold the CPU vendor name string 20252f952bfSBin Meng */ 20352f952bfSBin Meng const char *cpu_vendor_name(int vendor); 20452f952bfSBin Meng 205727c1a98SSimon Glass #define CPU_MAX_NAME_LEN 49 206727c1a98SSimon Glass 20752f952bfSBin Meng /** 208727c1a98SSimon Glass * cpu_get_name() - Get the name of the current cpu 20952f952bfSBin Meng * 210727c1a98SSimon Glass * @name: Place to put name, which must be CPU_MAX_NAME_LEN bytes including 211727c1a98SSimon Glass * @return pointer to name, which will likely be a few bytes after the start 212727c1a98SSimon Glass * of @name 213727c1a98SSimon Glass * \0 terminator 21452f952bfSBin Meng */ 215727c1a98SSimon Glass char *cpu_get_name(char *name); 21652f952bfSBin Meng 21752f952bfSBin Meng /** 218200182a7SSimon Glass * cpu_call64() - Jump to a 64-bit Linux kernel (internal function) 219200182a7SSimon Glass * 220200182a7SSimon Glass * The kernel is uncompressed and the 64-bit entry point is expected to be 221200182a7SSimon Glass * at @target. 222200182a7SSimon Glass * 223200182a7SSimon Glass * This function is used internally - see cpu_jump_to_64bit() for a more 224200182a7SSimon Glass * useful function. 225200182a7SSimon Glass * 226200182a7SSimon Glass * @pgtable: Address of 24KB area containing the page table 227200182a7SSimon Glass * @setup_base: Pointer to the setup.bin information for the kernel 228200182a7SSimon Glass * @target: Pointer to the start of the kernel image 229200182a7SSimon Glass */ 230200182a7SSimon Glass void cpu_call64(ulong pgtable, ulong setup_base, ulong target); 231200182a7SSimon Glass 232200182a7SSimon Glass /** 233*6f92ed8fSSimon Glass * cpu_call32() - Jump to a 32-bit entry point 234*6f92ed8fSSimon Glass * 235*6f92ed8fSSimon Glass * @code_seg32: 32-bit code segment to use (GDT offset, e.g. 0x20) 236*6f92ed8fSSimon Glass * @target: Pointer to the start of the 32-bit U-Boot image/entry point 237*6f92ed8fSSimon Glass * @table: Pointer to start of info table to pass to U-Boot 238*6f92ed8fSSimon Glass */ 239*6f92ed8fSSimon Glass void cpu_call32(ulong code_seg32, ulong target, ulong table); 240*6f92ed8fSSimon Glass 241*6f92ed8fSSimon Glass /** 242200182a7SSimon Glass * cpu_jump_to_64bit() - Jump to a 64-bit Linux kernel 243200182a7SSimon Glass * 244200182a7SSimon Glass * The kernel is uncompressed and the 64-bit entry point is expected to be 245200182a7SSimon Glass * at @target. 246200182a7SSimon Glass * 247200182a7SSimon Glass * @setup_base: Pointer to the setup.bin information for the kernel 248200182a7SSimon Glass * @target: Pointer to the start of the kernel image 249200182a7SSimon Glass */ 250200182a7SSimon Glass int cpu_jump_to_64bit(ulong setup_base, ulong target); 251200182a7SSimon Glass 2527bddac94SSimon Glass #endif 253