void
platform_init_ap(int cpuid)
{
uint32_t status;
register_t hwrena;
u_int clock_int_mask;
KASSERT(cpuid < MAXCPU, ("%s: invalid CPU id %d", __func__, cpuid));
/* Make sure coprocessors are enabled. */
status = mips_rd_status();
status |= (MIPS_SR_COP_0_BIT | MIPS_SR_COP_1_BIT);
#if defined(CPU_CHERI)
status |= MIPS_SR_COP_2_BIT;
#endif
mips_wr_status(status);
/* Enable HDWRD instruction in userspace. */
hwrena = mips_rd_hwrena();
hwrena |= (MIPS_HWRENA_CC | MIPS_HWRENA_CCRES | MIPS_HWRENA_CPUNUM);
mips_wr_hwrena(hwrena);
/*
* Enable per-thread timer.
*/
clock_int_mask = hard_int_mask(5);
set_intr_mask(clock_int_mask);
}
/*
* Attempt to identify the MIPS CPU as much as possible.
*
* XXX: Assumes the CPU is MIPS{32,64}{,r2} compliant.
* XXX: For now, skip config register selections 2 and 3
* as we don't currently use L2/L3 cache or additional
* MIPS32 processor features.
*/
static void
mips_get_identity(struct mips_cpuinfo *cpuinfo)
{
u_int32_t prid;
u_int32_t cfg0;
u_int32_t cfg1;
u_int32_t cfg2;
u_int32_t cfg3;
#if defined(CPU_CNMIPS)
u_int32_t cfg4;
#endif
u_int32_t tmp;
memset(cpuinfo, 0, sizeof(struct mips_cpuinfo));
/* Read and store the PrID ID for CPU identification. */
prid = mips_rd_prid();
cpuinfo->cpu_vendor = MIPS_PRID_CID(prid);
cpuinfo->cpu_rev = MIPS_PRID_REV(prid);
cpuinfo->cpu_impl = MIPS_PRID_IMPL(prid);
/* Read config register selection 0 to learn TLB type. */
cfg0 = mips_rd_config();
cpuinfo->tlb_type =
((cfg0 & MIPS_CONFIG0_MT_MASK) >> MIPS_CONFIG0_MT_SHIFT);
cpuinfo->icache_virtual = cfg0 & MIPS_CONFIG0_VI;
/* If config register selection 1 does not exist, return. */
if (!(cfg0 & MIPS_CONFIG0_M))
return;
/* Learn TLB size and L1 cache geometry. */
cfg1 = mips_rd_config1();
/* Get the Config2 and Config3 registers as well. */
if (cfg1 & MIPS_CONFIG1_M) {
cfg2 = mips_rd_config2();
if (cfg2 & MIPS_CONFIG2_M)
cfg3 = mips_rd_config3();
}
/* Check to see if UserLocal register is implemented. */
if (cfg3 & MIPS_CONFIG3_ULR) {
/* UserLocal register is implemented, enable it. */
cpuinfo->userlocal_reg = true;
tmp = mips_rd_hwrena();
mips_wr_hwrena(tmp | MIPS_HWRENA_UL);
} else {
/*
* UserLocal register is not implemented. Patch
* cpu_switch() and remove unsupported code.
*/
cpuinfo->userlocal_reg = false;
remove_userlocal_code((uint32_t *)cpu_switch);
}
#if defined(CPU_NLM)
/* Account for Extended TLB entries in XLP */
tmp = mips_rd_config6();
cpuinfo->tlb_nentries = ((tmp >> 16) & 0xffff) + 1;
#elif defined(BERI_LARGE_TLB)
/* Check if we support extended TLB entries and if so activate. */
tmp = mips_rd_config5();
#define BERI_CP5_LTLB_SUPPORTED 0x1
if (tmp & BERI_CP5_LTLB_SUPPORTED) {
/* See how many extra TLB entries we have. */
tmp = mips_rd_config6();
cpuinfo->tlb_nentries = (tmp >> 16) + 1;
/* Activate the extended entries. */
mips_wr_config6(tmp|0x4);
} else