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https://github.com/justinian/jsix.git
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b5662bfd25
Initial support for XSAVE, but not XSAVEOPT or XSAVEC: - Enable XSAVE and set up xcr0 for all CPUs - Allocate XSAVE area for all non-kernel threads - Call XSAVE and XRSTOR on task switch
31 lines
695 B
C++
31 lines
695 B
C++
#include <stdint.h>
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#include <cpu/cpu_id.h>
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#include "cpu.h"
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#include "xsave.h"
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uint64_t xcr0_val = 0;
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static size_t xsave_size_val = 0;
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const size_t &xsave_size = xsave_size_val;
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void
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xsave_init()
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{
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cpu::cpu_id cpuid;
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const auto regs = cpuid.get(0x0d);
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const uint64_t cpu_supported =
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(static_cast<uint64_t>(regs.edx) << 32) |
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static_cast<uint64_t>(regs.eax);
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xcr0_val = static_cast<uint64_t>(xcr0::J6_SUPPORTED) & cpu_supported;
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xsave_size_val = regs.ebx;
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}
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void
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xsave_enable()
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{
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const uint64_t rax = (xcr0_val & 0xFFFFFFFF);
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const uint64_t rdx = (xcr0_val >> 32);
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asm volatile ( "xsetbv" :: "c"(0), "d"(xcr0_val >> 32), "a"(xcr0_val) );
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}
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