/*
* Boot time overrides that are not scaled against main memory
*/
void
init_param1(void)
{
#ifndef XEN
vm_guest = detect_virtual();
#else
vm_guest = VM_GUEST_XEN;
#endif
hz = -1;
TUNABLE_INT_FETCH("kern.hz", &hz);
if (hz == -1)
hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ;
tick = 1000000 / hz;
#ifdef VM_SWZONE_SIZE_MAX
maxswzone = VM_SWZONE_SIZE_MAX;
#endif
TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone);
#ifdef VM_BCACHE_SIZE_MAX
maxbcache = VM_BCACHE_SIZE_MAX;
#endif
TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache);
msgbufsize = MSGBUF_SIZE;
TUNABLE_INT_FETCH("kern.msgbufsize", &msgbufsize);
maxtsiz = MAXTSIZ;
TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz);
dfldsiz = DFLDSIZ;
TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz);
maxdsiz = MAXDSIZ;
TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz);
dflssiz = DFLSSIZ;
TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz);
maxssiz = MAXSSIZ;
TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz);
sgrowsiz = SGROWSIZ;
TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz);
/*
* Let the administrator set {NGROUPS_MAX}, but disallow values
* less than NGROUPS_MAX which would violate POSIX.1-2008 or
* greater than INT_MAX-1 which would result in overflow.
*/
ngroups_max = NGROUPS_MAX;
TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max);
if (ngroups_max < NGROUPS_MAX)
ngroups_max = NGROUPS_MAX;
/*
* Only allow to lower the maximal pid.
* Prevent setting up a non-bootable system if pid_max is too low.
*/
TUNABLE_INT_FETCH("kern.pid_max", &pid_max);
if (pid_max > PID_MAX)
pid_max = PID_MAX;
else if (pid_max < 300)
pid_max = 300;
}
/*
* Initialize CPU control registers
*/
void
initializecpu(int cpu)
{
uint64_t msr;
/*Check for FXSR and SSE support and enable if available.*/
if ((cpu_feature & CPUID_XMM) && (cpu_feature & CPUID_FXSR)) {
load_cr4(rcr4() | CR4_FXSR | CR4_XMM);
cpu_fxsr = hw_instruction_sse = 1;
}
if (cpu == 0) {
/* Check if we are running in a hypervisor. */
vmm_guest = detect_virtual();
if (vmm_guest == VMM_GUEST_NONE && (cpu_feature2 & CPUID2_VMM))
vmm_guest = VMM_GUEST_UNKNOWN;
}
#if !defined(CPU_DISABLE_AVX)
/*Check for XSAVE and AVX support and enable if available.*/
if ((cpu_feature2 & CPUID2_AVX) && (cpu_feature2 & CPUID2_XSAVE)
&& (cpu_feature & CPUID_SSE)) {
load_cr4(rcr4() | CR4_XSAVE);
/* Adjust size of savefpu in npx.h before adding to mask.*/
xsetbv(0, CPU_XFEATURE_X87 | CPU_XFEATURE_SSE | CPU_XFEATURE_YMM, 0);
cpu_xsave = 1;
}
#endif
if (cpu_vendor_id == CPU_VENDOR_AMD) {
switch((cpu_id & 0xFF0000)) {
case 0x100000:
case 0x120000:
/*
* Errata 721 is the cpu bug found by your's truly
* (Matthew Dillon). It is a bug where a sequence
* of 5 or more popq's + a retq, under involved
* deep recursion circumstances, can cause the %rsp
* to not be properly updated, almost always
* resulting in a seg-fault soon after.
*
* Do not install the workaround when we are running
* in a virtual machine.
*/
if (vmm_guest)
break;
msr = rdmsr(MSR_AMD_DE_CFG);
if ((msr & 1) == 0) {
if (cpu == 0)
kprintf("Errata 721 workaround "
"installed\n");
msr |= 1;
wrmsr(MSR_AMD_DE_CFG, msr);
}
break;
}
}
if ((amd_feature & AMDID_NX) != 0) {
msr = rdmsr(MSR_EFER) | EFER_NXE;
wrmsr(MSR_EFER, msr);
#if 0 /* JG */
pg_nx = PG_NX;
#endif
}
if (cpu_vendor_id == CPU_VENDOR_CENTAUR &&
CPUID_TO_FAMILY(cpu_id) == 0x6 &&
CPUID_TO_MODEL(cpu_id) >= 0xf)
init_via();
TUNABLE_INT_FETCH("hw.clflush_enable", &hw_clflush_enable);
if (cpu_feature & CPUID_CLFSH) {
cpu_clflush_line_size = ((cpu_procinfo >> 8) & 0xff) * 8;
if (hw_clflush_enable == 0 ||
((hw_clflush_enable == -1) && vmm_guest))
cpu_feature &= ~CPUID_CLFSH;
}
