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[cpu] Split cpuid validation into separate lib

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In order to allow the bootloader to do preliminary CPUID validation
while UEFI is still handling displaying information to the user, split
most of the kernel's CPUID handling into a library to be used by both
kernel and boot.
This commit is contained in:
Justin C. Miller
2021-01-18 13:26:45 -08:00
parent e52fd8eacf
commit 34120fc4c1
8 changed files with 229 additions and 165 deletions
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69
src/kernel/cpu.h
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@@ -27,69 +27,6 @@ struct cpu_data
extern cpu_data bsp_cpu_data;
/// Enum of the cpu features jsix cares about
enum class cpu_feature {
#define CPU_FEATURE_REQ(name, ...) name,
#define CPU_FEATURE_OPT(name, ...) name,
#include "cpu_features.inc"
#undef CPU_FEATURE_OPT
#undef CPU_FEATURE_REQ
max
};
class cpu_id
{
public:
/// CPUID result register values
struct regs {
union {
uint32_t reg[4];
uint32_t eax, ebx, ecx, edx;
};
/// Return true if bit |bit| of EAX is set
bool eax_bit(unsigned bit) { return (eax >> bit) & 0x1; }
/// Return true if bit |bit| of EBX is set
bool ebx_bit(unsigned bit) { return (ebx >> bit) & 0x1; }
/// Return true if bit |bit| of ECX is set
bool ecx_bit(unsigned bit) { return (ecx >> bit) & 0x1; }
/// Return true if bit |bit| of EDX is set
bool edx_bit(unsigned bit) { return (edx >> bit) & 0x1; }
};
cpu_id();
/// The the result of a given CPUID leaf/subleaf
/// \arg leaf The leaf selector (initial EAX)
/// \arg subleaf The subleaf selector (initial ECX)
/// \returns A |regs| struct of the values retuned
regs get(uint32_t leaf, uint32_t sub = 0) const;
/// Get the name of the cpu vendor (eg, "GenuineIntel")
inline const char * vendor_id() const { return m_vendor_id; }
/// Get the brand name of this processor model
inline const char * brand_name() const { return m_brand_name; }
/// Get the highest basic CPUID leaf supported
inline uint32_t highest_basic() const { return m_high_basic; }
/// Get the highest extended CPUID leaf supported
inline uint32_t highest_ext() const { return m_high_ext; }
/// Validate the CPU supports the necessary options for jsix
void validate();
/// Return true if the CPU claims to support the given feature
bool has_feature(cpu_feature feat);
private:
uint32_t m_high_basic;
uint32_t m_high_ext;
char m_vendor_id[13];
char m_brand_name[48];
uint64_t m_features;
};
// We already validated the required options in the bootloader,
// but iterate the options and log about them.
void cpu_validate();