e4a733d5b2
git-subtree-dir: externals/biscuit git-subtree-split: 1d53c9e6cfe56544982200a5bac15a5de064936b
101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
// Copyright (c), 2022, KNS Group LLC (YADRO)
|
|
//
|
|
// Use of this source code is governed by an MIT-style
|
|
// license that can be found in the LICENSE file or at
|
|
// https://opensource.org/licenses/MIT.
|
|
|
|
#pragma once
|
|
|
|
#include <biscuit/assembler.hpp>
|
|
#include <biscuit/registers.hpp>
|
|
#include <cstddef>
|
|
#include <cstdint>
|
|
|
|
#if defined(__linux__) && defined(__riscv)
|
|
#include <sys/auxv.h>
|
|
#include <sys/prctl.h>
|
|
#include <asm/hwcap.h>
|
|
#endif
|
|
|
|
namespace biscuit {
|
|
|
|
#ifndef COMPAT_HWCAP_ISA_I
|
|
#define COMPAT_HWCAP_ISA_I (1U << ('I' - 'A'))
|
|
#endif
|
|
|
|
#ifndef COMPAT_HWCAP_ISA_M
|
|
#define COMPAT_HWCAP_ISA_M (1U << ('M' - 'A'))
|
|
#endif
|
|
|
|
#ifndef COMPAT_HWCAP_ISA_A
|
|
#define COMPAT_HWCAP_ISA_A (1U << ('A' - 'A'))
|
|
#endif
|
|
|
|
#ifndef COMPAT_HWCAP_ISA_F
|
|
#define COMPAT_HWCAP_ISA_F (1U << ('F' - 'A'))
|
|
#endif
|
|
|
|
#ifndef COMPAT_HWCAP_ISA_D
|
|
#define COMPAT_HWCAP_ISA_D (1U << ('D' - 'A'))
|
|
#endif
|
|
|
|
#ifndef COMPAT_HWCAP_ISA_C
|
|
#define COMPAT_HWCAP_ISA_C (1U << ('C' - 'A'))
|
|
#endif
|
|
|
|
#ifndef COMPAT_HWCAP_ISA_V
|
|
#define COMPAT_HWCAP_ISA_V (1U << ('V' - 'A'))
|
|
#endif
|
|
|
|
enum class RISCVExtension : uint64_t {
|
|
I = COMPAT_HWCAP_ISA_I,
|
|
M = COMPAT_HWCAP_ISA_M,
|
|
A = COMPAT_HWCAP_ISA_A,
|
|
F = COMPAT_HWCAP_ISA_F,
|
|
D = COMPAT_HWCAP_ISA_D,
|
|
C = COMPAT_HWCAP_ISA_C,
|
|
V = COMPAT_HWCAP_ISA_V
|
|
};
|
|
|
|
template <CSR csr>
|
|
struct CSRReader : public biscuit::Assembler {
|
|
// Buffer capacity exactly for 2 instructions.
|
|
static constexpr size_t capacity = 8;
|
|
|
|
CSRReader() : biscuit::Assembler{CSRReader::capacity} {
|
|
CSRR(a0, csr);
|
|
RET();
|
|
}
|
|
|
|
// Copy constructor and assignment.
|
|
CSRReader(const CSRReader&) = delete;
|
|
CSRReader& operator=(const CSRReader&) = delete;
|
|
|
|
// Move constructor and assignment.
|
|
CSRReader(CSRReader&&) = default;
|
|
CSRReader& operator=(CSRReader&&) = default;
|
|
|
|
template <typename CSRReaderFunc>
|
|
CSRReaderFunc GetCode() {
|
|
this->GetCodeBuffer().SetExecutable();
|
|
return reinterpret_cast<CSRReaderFunc>(this->GetBufferPointer(0));
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Class that detects information about a RISC-V CPU.
|
|
*/
|
|
class CPUInfo {
|
|
public:
|
|
/**
|
|
* Checks if a particular RISC-V extension is available.
|
|
*
|
|
* @param extension The extension to check.
|
|
*/
|
|
bool Has(RISCVExtension extension) const;
|
|
|
|
/// Returns the vector register length in bytes.
|
|
uint32_t GetVlenb() const;
|
|
};
|
|
|
|
} // namespace biscuit
|