powerpc: Merge smp.c and smp.h

This also moves setup_cpu_maps to setup-common.c (calling it
smp_setup_cpu_maps) and uses it on both 32-bit and 64-bit.

Signed-off-by: Paul Mackerras <paulus@samba.org>

10 files changed, 189 insertions, 197 deletions

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 631149ea93db..b3ae2993efb8 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_PPC_OF)		+= prom_init.o
 obj-$(CONFIG_MODULES)           += ppc_ksyms.o
 obj-$(CONFIG_BOOTX_TEXT)        += btext.o
 obj-$(CONFIG_6xx)               += idle_6xx.o
+obj-$(CONFIG_SMP)               += smp.o
 
 ifeq ($(CONFIG_PPC_ISERIES),y)
 $(obj)/head_64.o: $(obj)/lparmap.s
@@ -49,8 +50,9 @@ endif
 
 else
 # stuff used from here for ARCH=ppc or ARCH=ppc64
+smpobj-$(CONFIG_SMP)            += smp.o
 obj-$(CONFIG_PPC64)             += traps.o process.o init_task.o time.o \
-                                   setup-common.o
+                                   setup-common.o $(smpobj-y)
 
 
 endif
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 14ebe3bc48c3..d43fa8c0e5ac 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -170,12 +170,8 @@ static int show_cpuinfo(struct seq_file *m, void *v)
         }
 
 #ifdef CONFIG_SMP
-#ifdef CONFIG_PPC64     /* XXX for now */
         pvr = per_cpu(pvr, cpu_id);
 #else
-        pvr = cpu_data[cpu_id].pvr;
-#endif
-#else
         pvr = mfspr(SPRN_PVR);
 #endif
         maj = (pvr >> 8) & 0xFF;
@@ -408,3 +404,118 @@ static int __init set_preferred_console(void)
 }
 console_initcall(set_preferred_console);
 #endif /* CONFIG_PPC_MULTIPLATFORM */
+
+#ifdef CONFIG_SMP
+
+/**
+ * setup_cpu_maps - initialize the following cpu maps:
+ *                  cpu_possible_map
+ *                  cpu_present_map
+ *                  cpu_sibling_map
+ *
+ * Having the possible map set up early allows us to restrict allocations
+ * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
+ *
+ * We do not initialize the online map here; cpus set their own bits in
+ * cpu_online_map as they come up.
+ *
+ * This function is valid only for Open Firmware systems.  finish_device_tree
+ * must be called before using this.
+ *
+ * While we're here, we may as well set the "physical" cpu ids in the paca.
+ */
+void __init smp_setup_cpu_maps(void)
+{
+        struct device_node *dn = NULL;
+        int cpu = 0;
+        int swap_cpuid = 0;
+
+        while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
+                int *intserv;
+                int j, len = sizeof(u32), nthreads = 1;
+
+                intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
+                                              &len);
+                if (intserv)
+                        nthreads = len / sizeof(int);
+                else {
+                        intserv = (int *) get_property(dn, "reg", NULL);
+                        if (!intserv)
+                                intserv = &cpu; /* assume logical == phys */
+                }
+
+                for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
+                        cpu_set(cpu, cpu_present_map);
+                        set_hard_smp_processor_id(cpu, intserv[j]);
+
+                        if (intserv[j] == boot_cpuid_phys)
+                                swap_cpuid = cpu;
+                        cpu_set(cpu, cpu_possible_map);
+                        cpu++;
+                }
+        }
+
+        /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
+         * boot cpu is logical 0.
+         */
+        if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
+                u32 tmp;
+                tmp = get_hard_smp_processor_id(0);
+                set_hard_smp_processor_id(0, boot_cpuid_phys);
+                set_hard_smp_processor_id(swap_cpuid, tmp);
+        }
+
+#ifdef CONFIG_PPC64
+        /*
+         * On pSeries LPAR, we need to know how many cpus
+         * could possibly be added to this partition.
+         */
+        if (systemcfg->platform == PLATFORM_PSERIES_LPAR &&
+                                (dn = of_find_node_by_path("/rtas"))) {
+                int num_addr_cell, num_size_cell, maxcpus;
+                unsigned int *ireg;
+
+                num_addr_cell = prom_n_addr_cells(dn);
+                num_size_cell = prom_n_size_cells(dn);
+
+                ireg = (unsigned int *)
+                        get_property(dn, "ibm,lrdr-capacity", NULL);
+
+                if (!ireg)
+                        goto out;
+
+                maxcpus = ireg[num_addr_cell + num_size_cell];
+
+                /* Double maxcpus for processors which have SMT capability */
+                if (cpu_has_feature(CPU_FTR_SMT))
+                        maxcpus *= 2;
+
+                if (maxcpus > NR_CPUS) {
+                        printk(KERN_WARNING
+                               "Partition configured for %d cpus, "
+                               "operating system maximum is %d.\n",
+                               maxcpus, NR_CPUS);
+                        maxcpus = NR_CPUS;
+                } else
+                        printk(KERN_INFO "Partition configured for %d cpus.\n",
+                               maxcpus);
+
+                for (cpu = 0; cpu < maxcpus; cpu++)
+                        cpu_set(cpu, cpu_possible_map);
+        out:
+                of_node_put(dn);
+        }
+
+        /*
+         * Do the sibling map; assume only two threads per processor.
+         */
+        for_each_cpu(cpu) {
+                cpu_set(cpu, cpu_sibling_map[cpu]);
+                if (cpu_has_feature(CPU_FTR_SMT))
+                        cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
+        }
+
+        systemcfg->processorCount = num_present_cpus();
+#endif /* CONFIG_PPC64 */
+}
+#endif /* CONFIG_SMP */
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 9680ae99b084..b45eedbb4b3a 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -288,6 +288,8 @@ void __init setup_arch(char **cmdline_p)
         unflatten_device_tree();
         finish_device_tree();
 
+        smp_setup_cpu_maps();
+
 #ifdef CONFIG_BOOTX_TEXT
         init_boot_display();
 #endif
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 275d86ddd612..6b52cce872be 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -181,114 +181,8 @@ static int __init early_smt_enabled(char *p)
 }
 early_param("smt-enabled", early_smt_enabled);
 
-/**
- * setup_cpu_maps - initialize the following cpu maps:
- *                  cpu_possible_map
- *                  cpu_present_map
- *                  cpu_sibling_map
- *
- * Having the possible map set up early allows us to restrict allocations
- * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
- *
- * We do not initialize the online map here; cpus set their own bits in
- * cpu_online_map as they come up.
- *
- * This function is valid only for Open Firmware systems.  finish_device_tree
- * must be called before using this.
- *
- * While we're here, we may as well set the "physical" cpu ids in the paca.
- */
-static void __init setup_cpu_maps(void)
-{
-        struct device_node *dn = NULL;
-        int cpu = 0;
-        int swap_cpuid = 0;
-
-        check_smt_enabled();
-
-        while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
-                u32 *intserv;
-                int j, len = sizeof(u32), nthreads;
-
-                intserv = (u32 *)get_property(dn, "ibm,ppc-interrupt-server#s",
-                                              &len);
-                if (!intserv)
-                        intserv = (u32 *)get_property(dn, "reg", NULL);
-
-                nthreads = len / sizeof(u32);
-
-                for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
-                        cpu_set(cpu, cpu_present_map);
-                        set_hard_smp_processor_id(cpu, intserv[j]);
-
-                        if (intserv[j] == boot_cpuid_phys)
-                                swap_cpuid = cpu;
-                        cpu_set(cpu, cpu_possible_map);
-                        cpu++;
-                }
-        }
-
-        /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
-         * boot cpu is logical 0.
-         */
-        if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
-                u32 tmp;
-                tmp = get_hard_smp_processor_id(0);
-                set_hard_smp_processor_id(0, boot_cpuid_phys);
-                set_hard_smp_processor_id(swap_cpuid, tmp);
-        }
-
-        /*
-         * On pSeries LPAR, we need to know how many cpus
-         * could possibly be added to this partition.
-         */
-        if (systemcfg->platform == PLATFORM_PSERIES_LPAR &&
-                                (dn = of_find_node_by_path("/rtas"))) {
-                int num_addr_cell, num_size_cell, maxcpus;
-                unsigned int *ireg;
-
-                num_addr_cell = prom_n_addr_cells(dn);
-                num_size_cell = prom_n_size_cells(dn);
-
-                ireg = (unsigned int *)
-                        get_property(dn, "ibm,lrdr-capacity", NULL);
-
-                if (!ireg)
-                        goto out;
-
-                maxcpus = ireg[num_addr_cell + num_size_cell];
-
-                /* Double maxcpus for processors which have SMT capability */
-                if (cpu_has_feature(CPU_FTR_SMT))
-                        maxcpus *= 2;
-
-                if (maxcpus > NR_CPUS) {
-                        printk(KERN_WARNING
-                               "Partition configured for %d cpus, "
-                               "operating system maximum is %d.\n",
-                               maxcpus, NR_CPUS);
-                        maxcpus = NR_CPUS;
-                } else
-                        printk(KERN_INFO "Partition configured for %d cpus.\n",
-                               maxcpus);
-
-                for (cpu = 0; cpu < maxcpus; cpu++)
-                        cpu_set(cpu, cpu_possible_map);
-        out:
-                of_node_put(dn);
-        }
-
-        /*
-         * Do the sibling map; assume only two threads per processor.
-         */
-        for_each_cpu(cpu) {
-                cpu_set(cpu, cpu_sibling_map[cpu]);
-                if (cpu_has_feature(CPU_FTR_SMT))
-                        cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
-        }
-
-        systemcfg->processorCount = num_present_cpus();
-}
+#else
+#define check_smt_enabled()
 #endif /* CONFIG_SMP */
 
 extern struct machdep_calls pSeries_md;
@@ -417,6 +311,8 @@ void smp_release_cpus(void)
 
         DBG(" <- smp_release_cpus()\n");
 }
+#else
+#define smp_release_cpus()
 #endif /* CONFIG_SMP || CONFIG_KEXEC */
 
 /*
@@ -608,17 +504,13 @@ void __init setup_system(void)
 
         parse_early_param();
 
-#ifdef CONFIG_SMP
-        /*
-         * iSeries has already initialized the cpu maps at this point.
-         */
-        setup_cpu_maps();
+        check_smt_enabled();
+        smp_setup_cpu_maps();
 
         /* Release secondary cpus out of their spinloops at 0x60 now that
          * we can map physical -> logical CPU ids
          */
         smp_release_cpus();
-#endif
 
         printk("Starting Linux PPC64 %s\n", system_utsname.version);
 
diff --git a/arch/ppc64/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 017c12919832..1794a694a928 100644
--- a/arch/ppc64/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -39,13 +39,18 @@
 #include <asm/pgtable.h>
 #include <asm/prom.h>
 #include <asm/smp.h>
-#include <asm/paca.h>
 #include <asm/time.h>
+#include <asm/xmon.h>
 #include <asm/machdep.h>
 #include <asm/cputable.h>
 #include <asm/system.h>
-#include <asm/abs_addr.h>
 #include <asm/mpic.h>
+#ifdef CONFIG_PPC64
+#include <asm/paca.h>
+#endif
+
+int smp_hw_index[NR_CPUS];
+struct thread_info *secondary_ti;
 
 #ifdef DEBUG
 #define DBG(fmt...) udbg_printf(fmt)
@@ -60,6 +65,7 @@ cpumask_t cpu_sibling_map[NR_CPUS] = { [0 ... NR_CPUS-1] = CPU_MASK_NONE };
 EXPORT_SYMBOL(cpu_online_map);
 EXPORT_SYMBOL(cpu_possible_map);
 
+/* SMP operations for this machine */
 struct smp_ops_t *smp_ops;
 
 static volatile unsigned int cpu_callin_map[NR_CPUS];
@@ -89,7 +95,9 @@ void __devinit smp_mpic_setup_cpu(int cpu)
 {
         mpic_setup_this_cpu();
 }
+#endif /* CONFIG_MPIC */
 
+#ifdef CONFIG_PPC64
 void __devinit smp_generic_kick_cpu(int nr)
 {
         BUG_ON(nr < 0 || nr >= NR_CPUS);
@@ -102,8 +110,7 @@ void __devinit smp_generic_kick_cpu(int nr)
         paca[nr].cpu_start = 1;
         smp_mb();
 }
-
-#endif /* CONFIG_MPIC */
+#endif
 
 void smp_message_recv(int msg, struct pt_regs *regs)
 {
@@ -111,15 +118,10 @@ void smp_message_recv(int msg, struct pt_regs *regs)
         case PPC_MSG_CALL_FUNCTION:
                 smp_call_function_interrupt();
                 break;
-        case PPC_MSG_RESCHEDULE: 
+        case PPC_MSG_RESCHEDULE:
                 /* XXX Do we have to do this? */
                 set_need_resched();
                 break;
-#if 0
-        case PPC_MSG_MIGRATE_TASK:
-                /* spare */
-                break;
-#endif
 #ifdef CONFIG_DEBUGGER
         case PPC_MSG_DEBUGGER_BREAK:
                 debugger_ipi(regs);
@@ -171,8 +173,8 @@ static struct call_data_struct {
         int wait;
 } *call_data;
 
-/* delay of at least 8 seconds on 1GHz cpu */
-#define SMP_CALL_TIMEOUT (1UL << (30 + 3))
+/* delay of at least 8 seconds */
+#define SMP_CALL_TIMEOUT        8
 
 /*
  * This function sends a 'generic call function' IPI to all other CPUs
@@ -194,7 +196,7 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
 { 
         struct call_data_struct data;
         int ret = -1, cpus;
-        unsigned long timeout;
+        u64 timeout;
 
         /* Can deadlock when called with interrupts disabled */
         WARN_ON(irqs_disabled());
@@ -220,11 +222,12 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
         /* Send a message to all other CPUs and wait for them to respond */
         smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_CALL_FUNCTION);
 
+        timeout = get_tb() + (u64) SMP_CALL_TIMEOUT * tb_ticks_per_sec;
+
         /* Wait for response */
-        timeout = SMP_CALL_TIMEOUT;
         while (atomic_read(&data.started) != cpus) {
                 HMT_low();
-                if (--timeout == 0) {
+                if (get_tb() >= timeout) {
                         printk("smp_call_function on cpu %d: other cpus not "
                                "responding (%d)\n", smp_processor_id(),
                                atomic_read(&data.started));
@@ -234,10 +237,9 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
         }
 
         if (wait) {
-                timeout = SMP_CALL_TIMEOUT;
                 while (atomic_read(&data.finished) != cpus) {
                         HMT_low();
-                        if (--timeout == 0) {
+                        if (get_tb() >= timeout) {
                                 printk("smp_call_function on cpu %d: other "
                                        "cpus not finishing (%d/%d)\n",
                                        smp_processor_id(),
@@ -251,7 +253,7 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
 
         ret = 0;
 
-out:
+ out:
         call_data = NULL;
         HMT_medium();
         spin_unlock(&call_lock);
@@ -313,8 +315,11 @@ static void __init smp_create_idle(unsigned int cpu)
         p = fork_idle(cpu);
         if (IS_ERR(p))
                 panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p));
+#ifdef CONFIG_PPC64
         paca[cpu].__current = p;
+#endif
         current_set[cpu] = p->thread_info;
+        p->thread_info->cpu = cpu;
 }
 
 void __init smp_prepare_cpus(unsigned int max_cpus)
@@ -333,18 +338,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
         smp_store_cpu_info(boot_cpuid);
         cpu_callin_map[boot_cpuid] = 1;
 
-#ifndef CONFIG_PPC_ISERIES
-        paca[boot_cpuid].next_jiffy_update_tb = tb_last_stamp = get_tb();
-
-        /*
-         * Should update do_gtod.stamp_xsec.
-         * For now we leave it which means the time can be some
-         * number of msecs off until someone does a settimeofday()
-         */
-        do_gtod.varp->tb_orig_stamp = tb_last_stamp;
-        systemcfg->tb_orig_stamp = tb_last_stamp;
-#endif
-
         max_cpus = smp_ops->probe();
  
         smp_space_timers(max_cpus);
@@ -359,8 +352,9 @@ void __devinit smp_prepare_boot_cpu(void)
         BUG_ON(smp_processor_id() != boot_cpuid);
 
         cpu_set(boot_cpuid, cpu_online_map);
-
+#ifdef CONFIG_PPC64
         paca[boot_cpuid].__current = current;
+#endif
         current_set[boot_cpuid] = current->thread_info;
 }
 
@@ -444,13 +438,16 @@ int __devinit __cpu_up(unsigned int cpu)
 {
         int c;
 
+        secondary_ti = current_set[cpu];
         if (!cpu_enable(cpu))
                 return 0;
 
         if (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))
                 return -EINVAL;
 
+#ifdef CONFIG_PPC64
         paca[cpu].default_decr = tb_ticks_per_jiffy;
+#endif
 
         /* Make sure callin-map entry is 0 (can be leftover a CPU
          * hotplug
@@ -513,7 +510,7 @@ int __devinit start_secondary(void *unused)
         current->active_mm = &init_mm;
 
         smp_store_cpu_info(cpu);
-        set_dec(paca[cpu].default_decr);
+        set_dec(tb_ticks_per_jiffy);
         cpu_callin_map[cpu] = 1;
 
         smp_ops->setup_cpu(cpu);
diff --git a/arch/powerpc/platforms/chrp/smp.c b/arch/powerpc/platforms/chrp/smp.c
index 31ee49c25014..bb2315997d45 100644
--- a/arch/powerpc/platforms/chrp/smp.c
+++ b/arch/powerpc/platforms/chrp/smp.c
@@ -35,43 +35,6 @@
 #include <asm/smp.h>
 #include <asm/mpic.h>
 
-extern unsigned long smp_chrp_cpu_nr;
-
-static int __init smp_chrp_probe(void)
-{
-        struct device_node *cpus = NULL;
-        unsigned int *reg;
-        int reglen;
-        int ncpus = 0;
-        int cpuid;
-        unsigned int phys;
-
-        /* Count CPUs in the device-tree */
-        cpuid = 1;      /* the boot cpu is logical cpu 0 */
-        while ((cpus = of_find_node_by_type(cpus, "cpu")) != NULL) {
-                phys = ncpus;
-                reg = (unsigned int *) get_property(cpus, "reg", &reglen);
-                if (reg && reglen >= sizeof(unsigned int))
-                        /* hmmm, not having a reg property would be bad */
-                        phys = *reg;
-                if (phys != boot_cpuid_phys) {
-                        set_hard_smp_processor_id(cpuid, phys);
-                        ++cpuid;
-                }
-                ++ncpus;
-        }
-
-        printk(KERN_INFO "CHRP SMP probe found %d cpus\n", ncpus);
-
-        /* Nothing more to do if less than 2 of them */
-        if (ncpus <= 1)
-                return 1;
-
-        mpic_request_ipis();
-
-        return ncpus;
-}
-
 static void __devinit smp_chrp_kick_cpu(int nr)
 {
         *(unsigned long *)KERNELBASE = nr;
@@ -114,7 +77,7 @@ void __devinit smp_chrp_take_timebase(void)
 /* CHRP with openpic */
 struct smp_ops_t chrp_smp_ops = {
         .message_pass = smp_mpic_message_pass,
-        .probe = smp_chrp_probe,
+        .probe = smp_mpic_probe,
         .kick_cpu = smp_chrp_kick_cpu,
         .setup_cpu = smp_chrp_setup_cpu,
         .give_timebase = smp_chrp_give_timebase,
diff --git a/arch/ppc/kernel/Makefile b/arch/ppc/kernel/Makefile
index b35346df1e37..c610ca933a25 100644
--- a/arch/ppc/kernel/Makefile
+++ b/arch/ppc/kernel/Makefile
@@ -45,7 +45,6 @@ obj-$(CONFIG_MODULES)		+= module.o
 obj-$(CONFIG_NOT_COHERENT_CACHE)        += dma-mapping.o
 obj-$(CONFIG_PCI)               += pci.o
 obj-$(CONFIG_KGDB)              += ppc-stub.o
-obj-$(CONFIG_SMP)               += smp.o smp-tbsync.o
 obj-$(CONFIG_TAU)               += temp.o
 ifndef CONFIG_E200
 obj-$(CONFIG_FSL_BOOKE)         += perfmon_fsl_booke.o
diff --git a/arch/ppc/kernel/irq.c b/arch/ppc/kernel/irq.c
index 772e428aaa59..fbb2b9f8922c 100644
--- a/arch/ppc/kernel/irq.c
+++ b/arch/ppc/kernel/irq.c
@@ -126,7 +126,7 @@ skip:
                         seq_puts(p, "  PowerPC             Thermal Assist (cpu temp)\n");
                 }
 #endif
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
                 /* should this be per processor send/receive? */
                 seq_printf(p, "IPI (recv/sent): %10u/%u\n",
                                 atomic_read(&ipi_recv), atomic_read(&ipi_sent));
diff --git a/arch/ppc64/kernel/Makefile b/arch/ppc64/kernel/Makefile
index f597c2954b71..c441aebe7648 100644
--- a/arch/ppc64/kernel/Makefile
+++ b/arch/ppc64/kernel/Makefile
@@ -33,7 +33,6 @@ obj-$(CONFIG_PPC_PSERIES) += udbg_16550.o
 obj-$(CONFIG_KEXEC)             += machine_kexec.o
 obj-$(CONFIG_EEH)               += eeh.o
 obj-$(CONFIG_PROC_FS)           += proc_ppc64.o
-obj-$(CONFIG_SMP)               += smp.o
 obj-$(CONFIG_MODULES)           += module.o
 ifneq ($(CONFIG_PPC_MERGE),y)
 obj-$(CONFIG_MODULES)           += ppc_ksyms.o
diff --git a/include/asm-ppc64/smp.h b/include/asm-powerpc/smp.h
index ba0f5c8bbb22..8bcdd0faefea 100644
--- a/include/asm-ppc64/smp.h
+++ b/include/asm-powerpc/smp.h
@@ -1,5 +1,5 @@
 /* 
- * smp.h: PPC64 specific SMP code.
+ * smp.h: PowerPC-specific SMP code.
  *
  * Original was a copy of sparc smp.h.  Now heavily modified
  * for PPC.
@@ -13,9 +13,9 @@
  * 2 of the License, or (at your option) any later version.
  */
 
+#ifndef _ASM_POWERPC_SMP_H
+#define _ASM_POWERPC_SMP_H
 #ifdef __KERNEL__
-#ifndef _PPC64_SMP_H
-#define _PPC64_SMP_H
 
 #include <linux/config.h>
 #include <linux/threads.h>
@@ -24,7 +24,9 @@
 
 #ifndef __ASSEMBLY__
 
+#ifdef CONFIG_PPC64
 #include <asm/paca.h>
+#endif
 
 extern int boot_cpuid;
 extern int boot_cpuid_phys;
@@ -45,8 +47,19 @@ void generic_cpu_die(unsigned int cpu);
 void generic_mach_cpu_die(void);
 #endif
 
+#ifdef CONFIG_PPC64
 #define raw_smp_processor_id()  (get_paca()->paca_index)
 #define hard_smp_processor_id() (get_paca()->hw_cpu_id)
+#else
+/* 32-bit */
+extern int smp_hw_index[];
+
+#define raw_smp_processor_id()  (current_thread_info()->cpu)
+#define hard_smp_processor_id()         (smp_hw_index[smp_processor_id()])
+#define get_hard_smp_processor_id(cpu)  (smp_hw_index[(cpu)])
+#define set_hard_smp_processor_id(cpu, phys)\
+                                        (smp_hw_index[(cpu)] = (phys))
+#endif
 
 extern cpumask_t cpu_sibling_map[NR_CPUS];
 
@@ -65,21 +78,35 @@ extern cpumask_t cpu_sibling_map[NR_CPUS];
 void smp_init_iSeries(void);
 void smp_init_pSeries(void);
 void smp_init_cell(void);
+void smp_setup_cpu_maps(void);
 
 extern int __cpu_disable(void);
 extern void __cpu_die(unsigned int cpu);
+
+#else
+/* for UP */
+#define smp_setup_cpu_maps()
+#define smp_release_cpus()
+
 #endif /* CONFIG_SMP */
 
+#ifdef CONFIG_PPC64
 #define get_hard_smp_processor_id(CPU) (paca[(CPU)].hw_cpu_id)
 #define set_hard_smp_processor_id(CPU, VAL) \
         do { (paca[(CPU)].hw_cpu_id = (VAL)); } while (0)
+#else
+/* 32-bit */
+#ifndef CONFIG_SMP
+#define get_hard_smp_processor_id(cpu)  boot_cpuid_phys
+#define set_hard_smp_processor_id(cpu, phys)
+#endif
+#endif
 
 extern int smt_enabled_at_boot;
 
 extern int smp_mpic_probe(void);
 extern void smp_mpic_setup_cpu(int cpu);
 extern void smp_generic_kick_cpu(int nr);
-extern void smp_release_cpus(void);
 
 extern void smp_generic_give_timebase(void);
 extern void smp_generic_take_timebase(void);
@@ -88,5 +115,5 @@ extern struct smp_ops_t *smp_ops;
 
 #endif /* __ASSEMBLY__ */
 
-#endif /* !(_PPC64_SMP_H) */
 #endif /* __KERNEL__ */
+#endif /* _ASM_POWERPC_SMP_H) */