zircon/system/utest/processor/processor.c

// Copyright 2016 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <assert.h>
#if defined(__x86_64__)
#include <cpuid.h>
#endif
#include <errno.h>
#include <zircon/syscalls.h>
#include <unittest/unittest.h>
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>

struct desc_ptr {
    unsigned short size;
    unsigned long address;
} __attribute__((packed)) ;

#if defined(__x86_64__)
static bool is_umip_supported(void) {
    uint32_t eax, ebx, ecx, edx;
    if (__get_cpuid(7, &eax, &ebx, &ecx, &edx) != 1) {
        return false;
    }
    return ecx & (1u << 2);
}
#endif

static bool processor_test(void) {
    BEGIN_TEST;

#if defined(__x86_64__)
    if (!is_umip_supported()) {
        // Check the IDT is not in the kernel module.  Only run this check if
        // UMIP is not supported, since otherwise this will fault.

        // TODO(thgarnie) check all CPUs when sched_setaffinity is implemented
        struct desc_ptr idt;
        __asm__ ("sidt %0" : "=m" (idt));
        unittest_printf("IDT address = %lx\n", idt.address);
        EXPECT_LT(idt.address, 0xffffffff80000000UL,
                  "Check IDT is not in the kernel module (remapped)");
    }
#endif

    END_TEST;
}

BEGIN_TEST_CASE(processor_tests)
RUN_TEST(processor_test)
END_TEST_CASE(processor_tests)