44 lines
1.5 KiB
C++
44 lines
1.5 KiB
C++
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#include "arch/CPU.h"
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#include <String.h>
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#include <Types.h>
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#include <cpuid.h>
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extern "C" void enable_sse();
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extern "C" void enable_write_protect();
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namespace CPU
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{
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Result<const char*> identify()
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{
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static char brand_string[49];
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u32 buf[4];
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if (!__get_cpuid(0x80000002, &buf[0], &buf[1], &buf[2], &buf[3])) return err;
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memcpy(brand_string, buf, 16);
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if (!__get_cpuid(0x80000003, &buf[0], &buf[1], &buf[2], &buf[3])) return err;
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memcpy(&brand_string[16], buf, 16);
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if (!__get_cpuid(0x80000004, &buf[0], &buf[1], &buf[2], &buf[3])) return err;
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memcpy(&brand_string[32], buf, 16);
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brand_string[48] = 0; // null-terminate it :)
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return brand_string;
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}
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void platform_init()
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{
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enable_sse();
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enable_write_protect();
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}
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[[noreturn]] void efficient_halt() // Halt the CPU, using the lowest power possible. On x86-64 we do this using the
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// "hlt" instruction, which puts the CPU into a low-power idle state until the
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// next interrupt arrives... and we disable interrupts beforehand.
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{
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asm volatile("cli"); // Disable interrupts
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loop:
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asm volatile("hlt"); // Let the cpu rest and pause until the next interrupt arrives... which in this case should
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// be never (unless an NMI arrives) :)
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goto loop; // Safeguard: if we ever wake up, start our low-power rest again
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}
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}
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