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