SUPR0DECL(uint32_t) SUPR0GetKernelFeatures(void)
{
uint32_t fFlags = 0;
#ifdef CONFIG_PAX_KERNEXEC
fFlags |= SUPKERNELFEATURES_GDT_READ_ONLY;
#endif
#if defined(VBOX_STRICT) || defined(VBOX_WITH_EFLAGS_AC_SET_IN_VBOXDRV)
fFlags |= SUPKERNELFEATURES_SMAP;
#elif defined(CONFIG_X86_SMAP)
if (ASMGetCR4() & X86_CR4_SMAP)
fFlags |= SUPKERNELFEATURES_SMAP;
#endif
return fFlags;
}
RTCCUINTREG VBOXCALL supdrvOSChangeCR4(RTCCUINTREG fOrMask, RTCCUINTREG fAndMask)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 20, 0)
RTCCUINTREG uOld = this_cpu_read(cpu_tlbstate.cr4);
RTCCUINTREG uNew = (uOld & fAndMask) | fOrMask;
if (uNew != uOld)
{
this_cpu_write(cpu_tlbstate.cr4, uNew);
__write_cr4(uNew);
}
#else
RTCCUINTREG uOld = ASMGetCR4();
RTCCUINTREG uNew = (uOld & fAndMask) | fOrMask;
if (uNew != uOld)
ASMSetCR4(uNew);
#endif
return uOld;
}
/**
* Resolves kernel symbols we want (but may do without).
*/
static void vboxdrvDarwinResolveSymbols(void)
{
RTDBGKRNLINFO hKrnlInfo;
int rc = RTR0DbgKrnlInfoOpen(&hKrnlInfo, 0);
if (RT_SUCCESS(rc))
{
/* The VMX stuff. */
int rc1 = RTR0DbgKrnlInfoQuerySymbol(hKrnlInfo, NULL, "vmx_resume", (void **)&g_pfnVmxResume);
int rc2 = RTR0DbgKrnlInfoQuerySymbol(hKrnlInfo, NULL, "vmx_suspend", (void **)&g_pfnVmxSuspend);
int rc3 = RTR0DbgKrnlInfoQuerySymbol(hKrnlInfo, NULL, "vmx_use_count", (void **)&g_pVmxUseCount);
if (RT_SUCCESS(rc1) && RT_SUCCESS(rc2) && RT_SUCCESS(rc3))
{
LogRel(("VBoxDrv: vmx_resume=%p vmx_suspend=%p vmx_use_count=%p (%d) cr4=%#x\n",
g_pfnVmxResume, g_pfnVmxSuspend, g_pVmxUseCount, *g_pVmxUseCount, ASMGetCR4() ));
}
else
{
LogRel(("VBoxDrv: failed to resolve vmx stuff: vmx_resume=%Rrc vmx_suspend=%Rrc vmx_use_count=%Rrc", rc1, rc2, rc3));
g_pfnVmxResume = NULL;
g_pfnVmxSuspend = NULL;
g_pVmxUseCount = NULL;
}
RTR0DbgKrnlInfoRelease(hKrnlInfo);
}
else
LogRel(("VBoxDrv: Failed to open kernel symbols, rc=%Rrc\n", rc));
}
