mirror of
https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
290 lines
6.1 KiB
C
290 lines
6.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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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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#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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/* Global descriptor table (GDT) bits */
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enum {
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GDT_4KB = 1ULL << 55,
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GDT_32BIT = 1ULL << 54,
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GDT_LONG = 1ULL << 53,
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GDT_PRESENT = 1ULL << 47,
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GDT_NOTSYS = 1ULL << 44,
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GDT_CODE = 1ULL << 43,
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GDT_LIMIT_LOW_SHIFT = 0,
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GDT_LIMIT_LOW_MASK = 0xffff,
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GDT_LIMIT_HIGH_SHIFT = 48,
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GDT_LIMIT_HIGH_MASK = 0xf,
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GDT_BASE_LOW_SHIFT = 16,
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GDT_BASE_LOW_MASK = 0xffff,
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GDT_BASE_HIGH_SHIFT = 56,
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GDT_BASE_HIGH_MASK = 0xf,
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};
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/*
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* System controllers in an x86 system. We mostly need to just find these and
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* use them on PCI. At some point these might have their own uclass (e.g.
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* UCLASS_VIDEO for the GMA device).
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*/
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enum {
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X86_NONE,
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X86_SYSCON_ME, /* Intel Management Engine */
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X86_SYSCON_PINCONF, /* Intel x86 pin configuration */
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X86_SYSCON_PMU, /* Power Management Unit */
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X86_SYSCON_SCU, /* System Controller Unit */
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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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#if !CONFIG_IS_ENABLED(X86_64)
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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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#endif
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static inline void mfence(void)
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{
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__asm__ __volatile__("mfence" : : : "memory");
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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_call32() - Jump to a 32-bit entry point
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*
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* @code_seg32: 32-bit code segment to use (GDT offset, e.g. 0x20)
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* @target: Pointer to the start of the 32-bit U-Boot image/entry point
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* @table: Pointer to start of info table to pass to U-Boot
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*/
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void cpu_call32(ulong code_seg32, ulong target, ulong table);
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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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/**
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* cpu_jump_to_64bit_uboot() - special function to jump from SPL to U-Boot
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*
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* This handles calling from 32-bit SPL to 64-bit U-Boot.
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*
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* @target: Address of U-Boot in RAM
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*/
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int cpu_jump_to_64bit_uboot(ulong target);
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/**
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* cpu_get_family_model() - Get the family and model for the CPU
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*
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* @return the CPU ID masked with 0x0fff0ff0
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*/
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u32 cpu_get_family_model(void);
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/**
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* cpu_get_stepping() - Get the stepping value for the CPU
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*
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* @return the CPU ID masked with 0xf
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*/
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u32 cpu_get_stepping(void);
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#endif
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