MIPS: BMIPS: Add SMP support code for BMIPS43xx/BMIPS5000

Initial commit of BMIPS SMP support code.  Smoke-tested on a variety of
BMIPS4350, BMIPS4380, and BMIPS5000 platforms.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2977/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 714 insertions, 0 deletions

diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index 1a966183e35..01983215977 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_CPU_XLR)		+= r4k_fpu.o r4k_switch.o
 
 obj-$(CONFIG_SMP)               += smp.o
 obj-$(CONFIG_SMP_UP)            += smp-up.o
+obj-$(CONFIG_CPU_BMIPS)         += smp-bmips.o bmips_vec.o
 
 obj-$(CONFIG_MIPS_MT)           += mips-mt.o
 obj-$(CONFIG_MIPS_MT_FPAFF)     += mips-mt-fpaff.o
diff --git a/arch/mips/kernel/bmips_vec.S b/arch/mips/kernel/bmips_vec.S
new file mode 100644
index 00000000000..e908e81330b
--- /dev/null
+++ b/arch/mips/kernel/bmips_vec.S
@@ -0,0 +1,255 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2011 by Kevin Cernekee (cernekee@gmail.com)
+ *
+ * Reset/NMI/re-entry vectors for BMIPS processors
+ */
+
+#include <linux/init.h>
+
+#include <asm/asm.h>
+#include <asm/asmmacro.h>
+#include <asm/cacheops.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+#include <asm/stackframe.h>
+#include <asm/addrspace.h>
+#include <asm/hazards.h>
+#include <asm/bmips.h>
+
+        .macro  BARRIER
+        .set    mips32
+        _ssnop
+        _ssnop
+        _ssnop
+        .set    mips0
+        .endm
+
+        __CPUINIT
+
+/***********************************************************************
+ * Alternate CPU1 startup vector for BMIPS4350
+ *
+ * On some systems the bootloader has already started CPU1 and configured
+ * it to resume execution at 0x8000_0200 (!BEV IV vector) when it is
+ * triggered by the SW1 interrupt.  If that is the case we try to move
+ * it to a more convenient place: BMIPS_WARM_RESTART_VEC @ 0x8000_0380.
+ ***********************************************************************/
+
+LEAF(bmips_smp_movevec)
+        la      k0, 1f
+        li      k1, CKSEG1
+        or      k0, k1
+        jr      k0
+
+1:
+        /* clear IV, pending IPIs */
+        mtc0    zero, CP0_CAUSE
+
+        /* re-enable IRQs to wait for SW1 */
+        li      k0, ST0_IE | ST0_BEV | STATUSF_IP1
+        mtc0    k0, CP0_STATUS
+
+        /* set up CPU1 CBR; move BASE to 0xa000_0000 */
+        li      k0, 0xff400000
+        mtc0    k0, $22, 6
+        li      k1, CKSEG1 | BMIPS_RELO_VECTOR_CONTROL_1
+        or      k0, k1
+        li      k1, 0xa0080000
+        sw      k1, 0(k0)
+
+        /* wait here for SW1 interrupt from bmips_boot_secondary() */
+        wait
+
+        la      k0, bmips_reset_nmi_vec
+        li      k1, CKSEG1
+        or      k0, k1
+        jr      k0
+END(bmips_smp_movevec)
+
+/***********************************************************************
+ * Reset/NMI vector
+ * For BMIPS processors that can relocate their exception vectors, this
+ * entire function gets copied to 0x8000_0000.
+ ***********************************************************************/
+
+NESTED(bmips_reset_nmi_vec, PT_SIZE, sp)
+        .set    push
+        .set    noat
+        .align  4
+
+#ifdef CONFIG_SMP
+        /* if the NMI bit is clear, assume this is a CPU1 reset instead */
+        li      k1, (1 << 19)
+        mfc0    k0, CP0_STATUS
+        and     k0, k1
+        beqz    k0, bmips_smp_entry
+
+#if defined(CONFIG_CPU_BMIPS5000)
+        /* if we're not on core 0, this must be the SMP boot signal */
+        li      k1, (3 << 25)
+        mfc0    k0, $22
+        and     k0, k1
+        bnez    k0, bmips_smp_entry
+#endif
+#endif /* CONFIG_SMP */
+
+        /* nope, it's just a regular NMI */
+        SAVE_ALL
+        move    a0, sp
+
+        /* clear EXL, ERL, BEV so that TLB refills still work */
+        mfc0    k0, CP0_STATUS
+        li      k1, ST0_ERL | ST0_EXL | ST0_BEV | ST0_IE
+        or      k0, k1
+        xor     k0, k1
+        mtc0    k0, CP0_STATUS
+        BARRIER
+
+        /* jump to the NMI handler function */
+        la      k0, nmi_handler
+        jr      k0
+
+        RESTORE_ALL
+        .set    mips3
+        eret
+
+/***********************************************************************
+ * CPU1 reset vector (used for the initial boot only)
+ * This is still part of bmips_reset_nmi_vec().
+ ***********************************************************************/
+
+#ifdef CONFIG_SMP
+
+bmips_smp_entry:
+
+        /* set up CP0 STATUS; enable FPU */
+        li      k0, 0x30000000
+        mtc0    k0, CP0_STATUS
+        BARRIER
+
+        /* set local CP0 CONFIG to make kseg0 cacheable, write-back */
+        mfc0    k0, CP0_CONFIG
+        ori     k0, 0x07
+        xori    k0, 0x04
+        mtc0    k0, CP0_CONFIG
+
+#if defined(CONFIG_CPU_BMIPS4350) || defined(CONFIG_CPU_BMIPS4380)
+        /* initialize CPU1's local I-cache */
+        li      k0, 0x80000000
+        li      k1, 0x80010000
+        mtc0    zero, $28
+        mtc0    zero, $28, 1
+        BARRIER
+
+1:      cache   Index_Store_Tag_I, 0(k0)
+        addiu   k0, 16
+        bne     k0, k1, 1b
+#elif defined(CONFIG_CPU_BMIPS5000)
+        /* set exception vector base */
+        la      k0, ebase
+        lw      k0, 0(k0)
+        mtc0    k0, $15, 1
+        BARRIER
+#endif
+
+        /* jump back to kseg0 in case we need to remap the kseg1 area */
+        la      k0, 1f
+        jr      k0
+1:
+        la      k0, bmips_enable_xks01
+        jalr    k0
+
+        /* use temporary stack to set up upper memory TLB */
+        li      sp, BMIPS_WARM_RESTART_VEC
+        la      k0, plat_wired_tlb_setup
+        jalr    k0
+
+        /* switch to permanent stack and continue booting */
+
+        .global bmips_secondary_reentry
+bmips_secondary_reentry:
+        la      k0, bmips_smp_boot_sp
+        lw      sp, 0(k0)
+        la      k0, bmips_smp_boot_gp
+        lw      gp, 0(k0)
+        la      k0, start_secondary
+        jr      k0
+
+#endif /* CONFIG_SMP */
+
+        .align  4
+        .global bmips_reset_nmi_vec_end
+bmips_reset_nmi_vec_end:
+
+END(bmips_reset_nmi_vec)
+
+        .set    pop
+        .previous
+
+/***********************************************************************
+ * CPU1 warm restart vector (used for second and subsequent boots).
+ * Also used for S2 standby recovery (PM).
+ * This entire function gets copied to (BMIPS_WARM_RESTART_VEC)
+ ***********************************************************************/
+
+LEAF(bmips_smp_int_vec)
+
+        .align  4
+        mfc0    k0, CP0_STATUS
+        ori     k0, 0x01
+        xori    k0, 0x01
+        mtc0    k0, CP0_STATUS
+        eret
+
+        .align  4
+        .global bmips_smp_int_vec_end
+bmips_smp_int_vec_end:
+
+END(bmips_smp_int_vec)
+
+/***********************************************************************
+ * XKS01 support
+ * Certain CPUs support extending kseg0 to 1024MB.
+ ***********************************************************************/
+
+        __CPUINIT
+
+LEAF(bmips_enable_xks01)
+
+#if defined(CONFIG_XKS01)
+
+#if defined(CONFIG_CPU_BMIPS4380)
+        mfc0    t0, $22, 3
+        li      t1, 0x1ff0
+        li      t2, (1 << 12) | (1 << 9)
+        or      t0, t1
+        xor     t0, t1
+        or      t0, t2
+        mtc0    t0, $22, 3
+        BARRIER
+#elif defined(CONFIG_CPU_BMIPS5000)
+        mfc0    t0, $22, 5
+        li      t1, 0x01ff
+        li      t2, (1 << 8) | (1 << 5)
+        or      t0, t1
+        xor     t0, t1
+        or      t0, t2
+        mtc0    t0, $22, 5
+        BARRIER
+#else
+
+#error Missing XKS01 setup
+
+#endif
+
+#endif /* defined(CONFIG_XKS01) */
+
+        jr      ra
+
+END(bmips_enable_xks01)
+
+        .previous
diff --git a/arch/mips/kernel/smp-bmips.c b/arch/mips/kernel/smp-bmips.c
new file mode 100644
index 00000000000..58fe71afd87
--- /dev/null
+++ b/arch/mips/kernel/smp-bmips.c
@@ -0,0 +1,458 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2011 by Kevin Cernekee (cernekee@gmail.com)
+ *
+ * SMP support for BMIPS
+ */
+
+#include <linux/version.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/smp.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/init.h>
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <linux/reboot.h>
+#include <linux/io.h>
+#include <linux/compiler.h>
+#include <linux/linkage.h>
+#include <linux/bug.h>
+#include <linux/kernel.h>
+
+#include <asm/time.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/system.h>
+#include <asm/bootinfo.h>
+#include <asm/pmon.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/mipsregs.h>
+#include <asm/bmips.h>
+#include <asm/traps.h>
+#include <asm/barrier.h>
+
+static int __maybe_unused max_cpus = 1;
+
+/* these may be configured by the platform code */
+int bmips_smp_enabled = 1;
+int bmips_cpu_offset;
+cpumask_t bmips_booted_mask;
+
+#ifdef CONFIG_SMP
+
+/* initial $sp, $gp - used by arch/mips/kernel/bmips_vec.S */
+unsigned long bmips_smp_boot_sp;
+unsigned long bmips_smp_boot_gp;
+
+static void bmips_send_ipi_single(int cpu, unsigned int action);
+static irqreturn_t bmips_ipi_interrupt(int irq, void *dev_id);
+
+/* SW interrupts 0,1 are used for interprocessor signaling */
+#define IPI0_IRQ                        (MIPS_CPU_IRQ_BASE + 0)
+#define IPI1_IRQ                        (MIPS_CPU_IRQ_BASE + 1)
+
+#define CPUNUM(cpu, shift)              (((cpu) + bmips_cpu_offset) << (shift))
+#define ACTION_CLR_IPI(cpu, ipi)        (0x2000 | CPUNUM(cpu, 9) | ((ipi) << 8))
+#define ACTION_SET_IPI(cpu, ipi)        (0x3000 | CPUNUM(cpu, 9) | ((ipi) << 8))
+#define ACTION_BOOT_THREAD(cpu)         (0x08 | CPUNUM(cpu, 0))
+
+static void __init bmips_smp_setup(void)
+{
+        int i;
+
+#if defined(CONFIG_CPU_BMIPS4350) || defined(CONFIG_CPU_BMIPS4380)
+        /* arbitration priority */
+        clear_c0_brcm_cmt_ctrl(0x30);
+
+        /* NBK and weak order flags */
+        set_c0_brcm_config_0(0x30000);
+
+        /*
+         * MIPS interrupts 0,1 (SW INT 0,1) cross over to the other thread
+         * MIPS interrupt 2 (HW INT 0) is the CPU0 L1 controller output
+         * MIPS interrupt 3 (HW INT 1) is the CPU1 L1 controller output
+         */
+        change_c0_brcm_cmt_intr(0xf8018000,
+                (0x02 << 27) | (0x03 << 15));
+
+        /* single core, 2 threads (2 pipelines) */
+        max_cpus = 2;
+#elif defined(CONFIG_CPU_BMIPS5000)
+        /* enable raceless SW interrupts */
+        set_c0_brcm_config(0x03 << 22);
+
+        /* route HW interrupt 0 to CPU0, HW interrupt 1 to CPU1 */
+        change_c0_brcm_mode(0x1f << 27, 0x02 << 27);
+
+        /* N cores, 2 threads per core */
+        max_cpus = (((read_c0_brcm_config() >> 6) & 0x03) + 1) << 1;
+
+        /* clear any pending SW interrupts */
+        for (i = 0; i < max_cpus; i++) {
+                write_c0_brcm_action(ACTION_CLR_IPI(i, 0));
+                write_c0_brcm_action(ACTION_CLR_IPI(i, 1));
+        }
+#endif
+
+        if (!bmips_smp_enabled)
+                max_cpus = 1;
+
+        /* this can be overridden by the BSP */
+        if (!board_ebase_setup)
+                board_ebase_setup = &bmips_ebase_setup;
+
+        for (i = 0; i < max_cpus; i++) {
+                __cpu_number_map[i] = 1;
+                __cpu_logical_map[i] = 1;
+                set_cpu_possible(i, 1);
+                set_cpu_present(i, 1);
+        }
+}
+
+/*
+ * IPI IRQ setup - runs on CPU0
+ */
+static void bmips_prepare_cpus(unsigned int max_cpus)
+{
+        if (request_irq(IPI0_IRQ, bmips_ipi_interrupt, IRQF_PERCPU,
+                        "smp_ipi0", NULL))
+                panic("Can't request IPI0 interrupt\n");
+        if (request_irq(IPI1_IRQ, bmips_ipi_interrupt, IRQF_PERCPU,
+                        "smp_ipi1", NULL))
+                panic("Can't request IPI1 interrupt\n");
+}
+
+/*
+ * Tell the hardware to boot CPUx - runs on CPU0
+ */
+static void bmips_boot_secondary(int cpu, struct task_struct *idle)
+{
+        bmips_smp_boot_sp = __KSTK_TOS(idle);
+        bmips_smp_boot_gp = (unsigned long)task_thread_info(idle);
+        mb();
+
+        /*
+         * Initial boot sequence for secondary CPU:
+         *   bmips_reset_nmi_vec @ a000_0000 ->
+         *   bmips_smp_entry ->
+         *   plat_wired_tlb_setup (cached function call; optional) ->
+         *   start_secondary (cached jump)
+         *
+         * Warm restart sequence:
+         *   play_dead WAIT loop ->
+         *   bmips_smp_int_vec @ BMIPS_WARM_RESTART_VEC ->
+         *   eret to play_dead ->
+         *   bmips_secondary_reentry ->
+         *   start_secondary
+         */
+
+        pr_info("SMP: Booting CPU%d...\n", cpu);
+
+        if (cpumask_test_cpu(cpu, &bmips_booted_mask))
+                bmips_send_ipi_single(cpu, 0);
+        else {
+#if defined(CONFIG_CPU_BMIPS4350) || defined(CONFIG_CPU_BMIPS4380)
+                set_c0_brcm_cmt_ctrl(0x01);
+#elif defined(CONFIG_CPU_BMIPS5000)
+                if (cpu & 0x01)
+                        write_c0_brcm_action(ACTION_BOOT_THREAD(cpu));
+                else {
+                        /*
+                         * core N thread 0 was already booted; just
+                         * pulse the NMI line
+                         */
+                        bmips_write_zscm_reg(0x210, 0xc0000000);
+                        udelay(10);
+                        bmips_write_zscm_reg(0x210, 0x00);
+                }
+#endif
+                cpumask_set_cpu(cpu, &bmips_booted_mask);
+        }
+}
+
+/*
+ * Early setup - runs on secondary CPU after cache probe
+ */
+static void bmips_init_secondary(void)
+{
+        /* move NMI vector to kseg0, in case XKS01 is enabled */
+
+#if defined(CONFIG_CPU_BMIPS4350) || defined(CONFIG_CPU_BMIPS4380)
+        void __iomem *cbr = BMIPS_GET_CBR();
+        unsigned long old_vec;
+
+        old_vec = __raw_readl(cbr + BMIPS_RELO_VECTOR_CONTROL_1);
+        __raw_writel(old_vec & ~0x20000000, cbr + BMIPS_RELO_VECTOR_CONTROL_1);
+
+        clear_c0_cause(smp_processor_id() ? C_SW1 : C_SW0);
+#elif defined(CONFIG_CPU_BMIPS5000)
+        write_c0_brcm_bootvec(read_c0_brcm_bootvec() &
+                (smp_processor_id() & 0x01 ? ~0x20000000 : ~0x2000));
+
+        write_c0_brcm_action(ACTION_CLR_IPI(smp_processor_id(), 0));
+#endif
+
+        /* make sure there won't be a timer interrupt for a little while */
+        write_c0_compare(read_c0_count() + mips_hpt_frequency / HZ);
+
+        irq_enable_hazard();
+        set_c0_status(IE_SW0 | IE_SW1 | IE_IRQ1 | IE_IRQ5 | ST0_IE);
+        irq_enable_hazard();
+}
+
+/*
+ * Late setup - runs on secondary CPU before entering the idle loop
+ */
+static void bmips_smp_finish(void)
+{
+        pr_info("SMP: CPU%d is running\n", smp_processor_id());
+}
+
+/*
+ * Runs on CPU0 after all CPUs have been booted
+ */
+static void bmips_cpus_done(void)
+{
+}
+
+#if defined(CONFIG_CPU_BMIPS5000)
+
+/*
+ * BMIPS5000 raceless IPIs
+ *
+ * Each CPU has two inbound SW IRQs which are independent of all other CPUs.
+ * IPI0 is used for SMP_RESCHEDULE_YOURSELF
+ * IPI1 is used for SMP_CALL_FUNCTION
+ */
+
+static void bmips_send_ipi_single(int cpu, unsigned int action)
+{
+        write_c0_brcm_action(ACTION_SET_IPI(cpu, action == SMP_CALL_FUNCTION));
+}
+
+static irqreturn_t bmips_ipi_interrupt(int irq, void *dev_id)
+{
+        int action = irq - IPI0_IRQ;
+
+        write_c0_brcm_action(ACTION_CLR_IPI(smp_processor_id(), action));
+
+        if (action == 0)
+                scheduler_ipi();
+        else
+                smp_call_function_interrupt();
+
+        return IRQ_HANDLED;
+}
+
+#else
+
+/*
+ * BMIPS43xx racey IPIs
+ *
+ * We use one inbound SW IRQ for each CPU.
+ *
+ * A spinlock must be held in order to keep CPUx from accidentally clearing
+ * an incoming IPI when it writes CP0 CAUSE to raise an IPI on CPUy.  The
+ * same spinlock is used to protect the action masks.
+ */
+
+static DEFINE_SPINLOCK(ipi_lock);
+static DEFINE_PER_CPU(int, ipi_action_mask);
+
+static void bmips_send_ipi_single(int cpu, unsigned int action)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&ipi_lock, flags);
+        set_c0_cause(cpu ? C_SW1 : C_SW0);
+        per_cpu(ipi_action_mask, cpu) |= action;
+        irq_enable_hazard();
+        spin_unlock_irqrestore(&ipi_lock, flags);
+}
+
+static irqreturn_t bmips_ipi_interrupt(int irq, void *dev_id)
+{
+        unsigned long flags;
+        int action, cpu = irq - IPI0_IRQ;
+
+        spin_lock_irqsave(&ipi_lock, flags);
+        action = __get_cpu_var(ipi_action_mask);
+        per_cpu(ipi_action_mask, cpu) = 0;
+        clear_c0_cause(cpu ? C_SW1 : C_SW0);
+        spin_unlock_irqrestore(&ipi_lock, flags);
+
+        if (action & SMP_RESCHEDULE_YOURSELF)
+                scheduler_ipi();
+        if (action & SMP_CALL_FUNCTION)
+                smp_call_function_interrupt();
+
+        return IRQ_HANDLED;
+}
+
+#endif /* BMIPS type */
+
+static void bmips_send_ipi_mask(const struct cpumask *mask,
+        unsigned int action)
+{
+        unsigned int i;
+
+        for_each_cpu(i, mask)
+                bmips_send_ipi_single(i, action);
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+
+static int bmips_cpu_disable(void)
+{
+        unsigned int cpu = smp_processor_id();
+
+        if (cpu == 0)
+                return -EBUSY;
+
+        pr_info("SMP: CPU%d is offline\n", cpu);
+
+        cpu_clear(cpu, cpu_online_map);
+        cpu_clear(cpu, cpu_callin_map);
+
+        local_flush_tlb_all();
+        local_flush_icache_range(0, ~0);
+
+        return 0;
+}
+
+static void bmips_cpu_die(unsigned int cpu)
+{
+}
+
+void __ref play_dead(void)
+{
+        idle_task_exit();
+
+        /* flush data cache */
+        _dma_cache_wback_inv(0, ~0);
+
+        /*
+         * Wakeup is on SW0 or SW1; disable everything else
+         * Use BEV !IV (BMIPS_WARM_RESTART_VEC) to avoid the regular Linux
+         * IRQ handlers; this clears ST0_IE and returns immediately.
+         */
+        clear_c0_cause(CAUSEF_IV | C_SW0 | C_SW1);
+        change_c0_status(IE_IRQ5 | IE_IRQ1 | IE_SW0 | IE_SW1 | ST0_IE | ST0_BEV,
+                IE_SW0 | IE_SW1 | ST0_IE | ST0_BEV);
+        irq_disable_hazard();
+
+        /*
+         * wait for SW interrupt from bmips_boot_secondary(), then jump
+         * back to start_secondary()
+         */
+        __asm__ __volatile__(
+        "       wait\n"
+        "       j       bmips_secondary_reentry\n"
+        : : : "memory");
+}
+
+#endif /* CONFIG_HOTPLUG_CPU */
+
+struct plat_smp_ops bmips_smp_ops = {
+        .smp_setup              = bmips_smp_setup,
+        .prepare_cpus           = bmips_prepare_cpus,
+        .boot_secondary         = bmips_boot_secondary,
+        .smp_finish             = bmips_smp_finish,
+        .init_secondary         = bmips_init_secondary,
+        .cpus_done              = bmips_cpus_done,
+        .send_ipi_single        = bmips_send_ipi_single,
+        .send_ipi_mask          = bmips_send_ipi_mask,
+#ifdef CONFIG_HOTPLUG_CPU
+        .cpu_disable            = bmips_cpu_disable,
+        .cpu_die                = bmips_cpu_die,
+#endif
+};
+
+#endif /* CONFIG_SMP */
+
+/***********************************************************************
+ * BMIPS vector relocation
+ * This is primarily used for SMP boot, but it is applicable to some
+ * UP BMIPS systems as well.
+ ***********************************************************************/
+
+static void __cpuinit bmips_wr_vec(unsigned long dst, char *start, char *end)
+{
+        memcpy((void *)dst, start, end - start);
+        dma_cache_wback((unsigned long)start, end - start);
+        local_flush_icache_range(dst, dst + (end - start));
+        instruction_hazard();
+}
+
+static inline void __cpuinit bmips_nmi_handler_setup(void)
+{
+        bmips_wr_vec(BMIPS_NMI_RESET_VEC, &bmips_reset_nmi_vec,
+                &bmips_reset_nmi_vec_end);
+        bmips_wr_vec(BMIPS_WARM_RESTART_VEC, &bmips_smp_int_vec,
+                &bmips_smp_int_vec_end);
+}
+
+void __cpuinit bmips_ebase_setup(void)
+{
+        unsigned long new_ebase = ebase;
+        void __iomem __maybe_unused *cbr;
+
+        BUG_ON(ebase != CKSEG0);
+
+#if defined(CONFIG_CPU_BMIPS4350)
+        /*
+         * BMIPS4350 cannot relocate the normal vectors, but it
+         * can relocate the BEV=1 vectors.  So CPU1 starts up at
+         * the relocated BEV=1, IV=0 general exception vector @
+         * 0xa000_0380.
+         *
+         * set_uncached_handler() is used here because:
+         *  - CPU1 will run this from uncached space
+         *  - None of the cacheflush functions are set up yet
+         */
+        set_uncached_handler(BMIPS_WARM_RESTART_VEC - CKSEG0,
+                &bmips_smp_int_vec, 0x80);
+        __sync();
+        return;
+#elif defined(CONFIG_CPU_BMIPS4380)
+        /*
+         * 0x8000_0000: reset/NMI (initially in kseg1)
+         * 0x8000_0400: normal vectors
+         */
+        new_ebase = 0x80000400;
+        cbr = BMIPS_GET_CBR();
+        __raw_writel(0x80080800, cbr + BMIPS_RELO_VECTOR_CONTROL_0);
+        __raw_writel(0xa0080800, cbr + BMIPS_RELO_VECTOR_CONTROL_1);
+#elif defined(CONFIG_CPU_BMIPS5000)
+        /*
+         * 0x8000_0000: reset/NMI (initially in kseg1)
+         * 0x8000_1000: normal vectors
+         */
+        new_ebase = 0x80001000;
+        write_c0_brcm_bootvec(0xa0088008);
+        write_c0_ebase(new_ebase);
+        if (max_cpus > 2)
+                bmips_write_zscm_reg(0xa0, 0xa008a008);
+#else
+        return;
+#endif
+        board_nmi_handler_setup = &bmips_nmi_handler_setup;
+        ebase = new_ebase;
+}
+
+asmlinkage void __weak plat_wired_tlb_setup(void)
+{
+        /*
+         * Called when starting/restarting a secondary CPU.
+         * Kernel stacks and other important data might only be accessible
+         * once the wired entries are present.
+         */
+}