221 lines
4.3 KiB
C
221 lines
4.3 KiB
C
/*
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* Copyright (c) 2014 The Chromium OS Authors.
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*
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* Part of this file is adapted from coreboot
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* src/arch/x86/include/arch/cpu.h and
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* src/arch/x86/lib/cpu.c
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _ASM_CPU_H
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#define _ASM_CPU_H
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enum {
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X86_VENDOR_INVALID = 0,
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X86_VENDOR_INTEL,
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X86_VENDOR_CYRIX,
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X86_VENDOR_AMD,
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X86_VENDOR_UMC,
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X86_VENDOR_NEXGEN,
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X86_VENDOR_CENTAUR,
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X86_VENDOR_RISE,
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X86_VENDOR_TRANSMETA,
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X86_VENDOR_NSC,
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X86_VENDOR_SIS,
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X86_VENDOR_ANY = 0xfe,
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X86_VENDOR_UNKNOWN = 0xff
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};
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struct cpuid_result {
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uint32_t eax;
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uint32_t ebx;
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uint32_t ecx;
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uint32_t edx;
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};
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/*
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* Generic CPUID function
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*/
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static inline struct cpuid_result cpuid(int op)
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{
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struct cpuid_result result;
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asm volatile(
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"mov %%ebx, %%edi;"
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"cpuid;"
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"mov %%ebx, %%esi;"
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"mov %%edi, %%ebx;"
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: "=a" (result.eax),
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"=S" (result.ebx),
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"=c" (result.ecx),
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"=d" (result.edx)
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: "0" (op)
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: "edi");
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return result;
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}
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/*
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* Generic Extended CPUID function
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*/
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static inline struct cpuid_result cpuid_ext(int op, unsigned ecx)
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{
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struct cpuid_result result;
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asm volatile(
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"mov %%ebx, %%edi;"
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"cpuid;"
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"mov %%ebx, %%esi;"
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"mov %%edi, %%ebx;"
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: "=a" (result.eax),
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"=S" (result.ebx),
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"=c" (result.ecx),
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"=d" (result.edx)
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: "0" (op), "2" (ecx)
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: "edi");
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return result;
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}
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/*
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* CPUID functions returning a single datum
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*/
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static inline unsigned int cpuid_eax(unsigned int op)
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{
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unsigned int eax;
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__asm__("mov %%ebx, %%edi;"
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"cpuid;"
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"mov %%edi, %%ebx;"
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: "=a" (eax)
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: "0" (op)
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: "ecx", "edx", "edi");
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return eax;
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}
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static inline unsigned int cpuid_ebx(unsigned int op)
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{
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unsigned int eax, ebx;
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__asm__("mov %%ebx, %%edi;"
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"cpuid;"
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"mov %%ebx, %%esi;"
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"mov %%edi, %%ebx;"
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: "=a" (eax), "=S" (ebx)
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: "0" (op)
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: "ecx", "edx", "edi");
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return ebx;
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}
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static inline unsigned int cpuid_ecx(unsigned int op)
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{
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unsigned int eax, ecx;
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__asm__("mov %%ebx, %%edi;"
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"cpuid;"
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"mov %%edi, %%ebx;"
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: "=a" (eax), "=c" (ecx)
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: "0" (op)
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: "edx", "edi");
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return ecx;
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}
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static inline unsigned int cpuid_edx(unsigned int op)
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{
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unsigned int eax, edx;
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__asm__("mov %%ebx, %%edi;"
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"cpuid;"
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"mov %%edi, %%ebx;"
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: "=a" (eax), "=d" (edx)
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: "0" (op)
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: "ecx", "edi");
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return edx;
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}
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/* Standard macro to see if a specific flag is changeable */
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static inline int flag_is_changeable_p(uint32_t flag)
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{
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uint32_t f1, f2;
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asm(
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"pushfl\n\t"
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"pushfl\n\t"
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"popl %0\n\t"
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"movl %0,%1\n\t"
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"xorl %2,%0\n\t"
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"pushl %0\n\t"
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"popfl\n\t"
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"pushfl\n\t"
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"popl %0\n\t"
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"popfl\n\t"
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: "=&r" (f1), "=&r" (f2)
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: "ir" (flag));
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return ((f1^f2) & flag) != 0;
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}
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/**
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* cpu_enable_paging_pae() - Enable PAE-paging
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*
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* @cr3: Value to set in cr3 (PDPT or PML4T)
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*/
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void cpu_enable_paging_pae(ulong cr3);
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/**
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* cpu_disable_paging_pae() - Disable paging and PAE
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*/
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void cpu_disable_paging_pae(void);
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/**
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* cpu_has_64bit() - Check if the CPU has 64-bit support
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*
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* @return 1 if this CPU supports long mode (64-bit), 0 if not
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*/
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int cpu_has_64bit(void);
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/**
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* cpu_vendor_name() - Get CPU vendor name
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*
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* @vendor: CPU vendor enumeration number
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*
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* @return: Address to hold the CPU vendor name string
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*/
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const char *cpu_vendor_name(int vendor);
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#define CPU_MAX_NAME_LEN 49
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/**
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* cpu_get_name() - Get the name of the current cpu
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*
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* @name: Place to put name, which must be CPU_MAX_NAME_LEN bytes including
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* @return pointer to name, which will likely be a few bytes after the start
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* of @name
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* \0 terminator
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*/
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char *cpu_get_name(char *name);
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/**
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* cpu_call64() - Jump to a 64-bit Linux kernel (internal function)
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*
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* The kernel is uncompressed and the 64-bit entry point is expected to be
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* at @target.
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*
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* This function is used internally - see cpu_jump_to_64bit() for a more
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* useful function.
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*
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* @pgtable: Address of 24KB area containing the page table
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* @setup_base: Pointer to the setup.bin information for the kernel
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* @target: Pointer to the start of the kernel image
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*/
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void cpu_call64(ulong pgtable, ulong setup_base, ulong target);
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/**
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* cpu_jump_to_64bit() - Jump to a 64-bit Linux kernel
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*
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* The kernel is uncompressed and the 64-bit entry point is expected to be
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* at @target.
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*
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* @setup_base: Pointer to the setup.bin information for the kernel
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* @target: Pointer to the start of the kernel image
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*/
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int cpu_jump_to_64bit(ulong setup_base, ulong target);
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#endif
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