Merge foobazco.org:/sources/2.5-bk

into foobazco.org:/sources/2.5-sparc-smp

arch/sparc/kernel/cpu.c

@@ -4,6 +4,7 @@
  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
  */
 
+#include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/smp.h>
@@ -13,6 +14,9 @@
 #include <asm/head.h>
 #include <asm/psr.h>
 #include <asm/mbus.h>
+#include <asm/cpudata.h>
+
+DEFINE_PER_CPU(cpuinfo_sparc, __cpu_data) = { 0 };
 
 struct cpu_iu_info {
   int psr_impl;
@@ -118,17 +122,15 @@ struct cpu_iu_info linux_sparc_chips[] = {
 
 #define NSPARCCHIPS  (sizeof(linux_sparc_chips)/sizeof(struct cpu_iu_info))
 
-char *sparc_cpu_type[NR_CPUS] = { 0 };
-char *sparc_fpu_type[NR_CPUS] = { 0 };
+char *sparc_cpu_type;
+char *sparc_fpu_type;
 
 unsigned int fsr_storage;
 
 void __init cpu_probe(void)
 {
 	int psr_impl, psr_vers, fpu_vers;
-	int i, cpuid, psr;
-
-	cpuid = hard_smp_processor_id();
+	int i, psr;
 
 	psr_impl = ((get_psr()>>28)&0xf);
 	psr_vers = ((get_psr()>>24)&0xf);
@@ -141,7 +143,7 @@ void __init cpu_probe(void)
 	for(i = 0; i<NSPARCCHIPS; i++) {
 		if(linux_sparc_chips[i].psr_impl == psr_impl)
 			if(linux_sparc_chips[i].psr_vers == psr_vers) {
-				sparc_cpu_type[cpuid] = linux_sparc_chips[i].cpu_name;
+				sparc_cpu_type = linux_sparc_chips[i].cpu_name;
 				break;
 			}
 	}
@@ -153,7 +155,7 @@ void __init cpu_probe(void)
 	for(i = 0; i<NSPARCFPU; i++) {
 		if(linux_sparc_fpu[i].psr_impl == psr_impl)
 			if(linux_sparc_fpu[i].fp_vers == fpu_vers) {
-				sparc_fpu_type[cpuid] = linux_sparc_fpu[i].fp_name;
+				sparc_fpu_type = linux_sparc_fpu[i].fp_name;
 				break;
 			}
 	}
@@ -161,6 +163,6 @@ void __init cpu_probe(void)
 	if(i == NSPARCFPU) {
 		printk("DEBUG: psr.impl = 0x%x  fsr.vers = 0x%x\n", psr_impl,
 			    fpu_vers);
-		sparc_fpu_type[cpuid] = linux_sparc_fpu[31].fp_name;
+		sparc_fpu_type = linux_sparc_fpu[31].fp_name;
 	}
 }

arch/sparc/kernel/devices.c

 /* devices.c: Initial scan of the prom device tree for important
  *	      Sparc device nodes which we need to find.
  *
+ * This is based on the sparc64 version, but sun4m doesn't always use
+ * the hardware MIDs, so be careful.
+ *
  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
  */
 
@@ -9,73 +12,135 @@
 #include <linux/threads.h>
 #include <linux/string.h>
 #include <linux/init.h>
+#include <linux/errno.h>
 
 #include <asm/page.h>
 #include <asm/oplib.h>
 #include <asm/smp.h>
 #include <asm/system.h>
-
-struct prom_cpuinfo linux_cpus[32];
-int linux_num_cpus = 0;
+#include <asm/cpudata.h>
 
 extern void cpu_probe(void);
 extern void clock_stop_probe(void); /* tadpole.c */
 extern void sun4c_probe_memerr_reg(void);
 
-void __init
-device_scan(void)
+static char *cpu_mid_prop(void)
+{
+	if (sparc_cpu_model == sun4d)
+		return "cpu-id";
+	return "mid";
+}
+
+static int check_cpu_node(int nd, int *cur_inst,
+			  int (*compare)(int, int, void *), void *compare_arg,
+			  int *prom_node, int *mid)
 {
 	char node_str[128];
-	int thismid;
 
-	prom_getstring(prom_root_node, "device_type", node_str, sizeof(node_str));
+	prom_getstring(nd, "device_type", node_str, sizeof(node_str));
+	if (strcmp(node_str, "cpu"))
+		return -ENODEV;
 	
-	prom_printf("Booting Linux...\n");
-	if(strcmp(node_str, "cpu") == 0) {
-		linux_num_cpus++;
-	} else {
-		int scan;
-		scan = prom_getchild(prom_root_node);
-		/* One can look it up in PROM instead */
-		while ((scan = prom_getsibling(scan)) != 0) {
-			prom_getstring(scan, "device_type",
-				       node_str, sizeof(node_str));
-			if (strcmp(node_str, "cpu") == 0) {
-				linux_cpus[linux_num_cpus].prom_node = scan;
-				prom_getproperty(scan, "mid",
-						 (char *) &thismid, sizeof(thismid));
-				linux_cpus[linux_num_cpus].mid = thismid;
-				printk("Found CPU %d <node=%08lx,mid=%d>\n",
-				       linux_num_cpus, (unsigned long) scan, thismid);
-				linux_num_cpus++;
-			}
-		}
-		if (linux_num_cpus == 0 && sparc_cpu_model == sun4d) {
-			scan = prom_getchild(prom_root_node);
-			for (scan = prom_searchsiblings(scan, "cpu-unit"); scan;
-			     scan = prom_searchsiblings(prom_getsibling(scan), "cpu-unit")) {
-				int node = prom_getchild(scan);
-
-				prom_getstring(node, "device_type",
-					       node_str, sizeof(node_str));
-				if (strcmp(node_str, "cpu") == 0) {
-					prom_getproperty(node, "cpu-id",
-							 (char *) &thismid, sizeof(thismid));
-					linux_cpus[linux_num_cpus].prom_node = node;
-					linux_cpus[linux_num_cpus].mid = thismid;
-					printk("Found CPU %d <node=%08lx,mid=%d>\n", 
-					       linux_num_cpus, (unsigned long) node, thismid);
-					linux_num_cpus++;
+	if (!compare(nd, *cur_inst, compare_arg)) {
+		if (prom_node)
+			*prom_node = nd;
+		if (mid) {
+			*mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
+			if (sparc_cpu_model == sun4m)
+				*mid &= 3;
 		}
+		return 0;
 	}
+
+	(*cur_inst)++;
+
+	return -ENODEV;
+}
+
+static int __cpu_find_by(int (*compare)(int, int, void *), void *compare_arg,
+			 int *prom_node, int *mid)
+{
+	int nd, cur_inst, err;
+
+	nd = prom_root_node;
+	cur_inst = 0;
+
+	err = check_cpu_node(nd, &cur_inst, compare, compare_arg,
+			     prom_node, mid);
+	if (!err)
+		return 0;
+
+	nd = prom_getchild(nd);
+	while ((nd = prom_getsibling(nd)) != 0) {
+		err = check_cpu_node(nd, &cur_inst, compare, compare_arg,
+				     prom_node, mid);
+		if (!err)
+			return 0;
 	}
-		if (linux_num_cpus == 0) {
-			printk("No CPU nodes found, cannot continue.\n");
+
+	return -ENODEV;
+}
+
+static int cpu_instance_compare(int nd, int instance, void *_arg)
+{
+	int desired_instance = (int) _arg;
+
+	if (instance == desired_instance)
+		return 0;
+	return -ENODEV;
+}
+
+int cpu_find_by_instance(int instance, int *prom_node, int *mid)
+{
+	return __cpu_find_by(cpu_instance_compare, (void *)instance,
+			     prom_node, mid);
+}
+
+static int cpu_mid_compare(int nd, int instance, void *_arg)
+{
+	int desired_mid = (int) _arg;
+	int this_mid;
+
+	this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
+	if (this_mid == desired_mid
+	    || (sparc_cpu_model == sun4m && (this_mid & 3) == desired_mid))
+		return 0;
+	return -ENODEV;
+}
+
+int cpu_find_by_mid(int mid, int *prom_node)
+{
+	return __cpu_find_by(cpu_mid_compare, (void *)mid,
+			     prom_node, NULL);
+}
+
+/* sun4m uses truncated mids since we base the cpuid on the ttable/irqset
+ * address (0-3).  This gives us the true hardware mid, which might have
+ * some other bits set.  On 4d hardware and software mids are the same.
+ */
+int cpu_get_hwmid(int prom_node)
+{
+	return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV);
+}
+
+void __init device_scan(void)
+{
+	prom_printf("Booting Linux...\n");
+
+#ifndef CONFIG_SMP
+	{
+		int err, cpu_node;
+		err = cpu_find_by_instance(0, &cpu_node, NULL);
+		if (err) {
 			/* Probably a sun4e, Sun is trying to trick us ;-) */
+			prom_printf("No cpu nodes, cannot continue\n");
 			prom_halt();
 		}
-		printk("Found %d CPU prom device tree node(s).\n", linux_num_cpus);
+		cpu_data(0).clock_tick = prom_getintdefault(cpu_node,
+							    "clock-frequency",
+							    0);
 	}
+#endif /* !CONFIG_SMP */
 
 	cpu_probe();
 #ifdef CONFIG_SUN_AUXIO

arch/sparc/kernel/entry.S

@@ -349,7 +349,7 @@ smp4m_ticker:
 	 * for cross calls.  That has a separate entry point below.
 	 */
 maybe_smp4m_msg:
-	GET_PROCESSOR_MID(o3, o2)
+	GET_PROCESSOR_MID(o3)
 	set	sun4m_interrupts, %l5
 	ld	[%l5], %o5
 	sethi	%hi(0x60000000), %o4
@@ -389,7 +389,7 @@ maybe_smp4m_msg:
 linux_trap_ipi15_sun4m:
 	SAVE_ALL
 	sethi	%hi(0x80000000), %o2
-	GET_PROCESSOR_MID(o0, o1)
+	GET_PROCESSOR_MID(o0)
 	set	sun4m_interrupts, %l5
 	ld	[%l5], %o5
 	sll	%o0, 12, %o0

arch/sparc/kernel/setup.c

@@ -46,6 +46,7 @@
 #include <asm/idprom.h>
 #include <asm/hardirq.h>
 #include <asm/machines.h>
+#include <asm/cpudata.h>
 
 struct screen_info screen_info = {
 	0, 0,			/* orig-x, orig-y */
@@ -389,13 +390,11 @@ static int __init set_preferred_console(void)
 }
 console_initcall(set_preferred_console);
 
-extern char *sparc_cpu_type[];
-extern char *sparc_fpu_type[];
+extern char *sparc_cpu_type;
+extern char *sparc_fpu_type;
 
 static int show_cpuinfo(struct seq_file *m, void *__unused)
 {
-	int cpuid = hard_smp_processor_id();
-
 	seq_printf(m,
 		   "cpu\t\t: %s\n"
 		   "fpu\t\t: %s\n"
@@ -405,26 +404,28 @@ static int show_cpuinfo(struct seq_file *m, void *__unused)
 		   "ncpus probed\t: %d\n"
 		   "ncpus active\t: %d\n"
 #ifndef CONFIG_SMP
-		   "BogoMips\t: %lu.%02lu\n"
+		   "CPU0Bogo\t: %lu.%02lu\n"
+		   "CPU0ClkTck\t: %ld\n"
 #endif
 		   ,
-		   sparc_cpu_type[cpuid] ? : "undetermined",
-		   sparc_fpu_type[cpuid] ? : "undetermined",
+		   sparc_cpu_type ? sparc_cpu_type : "undetermined",
+		   sparc_fpu_type ? sparc_fpu_type : "undetermined",
 		   romvec->pv_romvers,
 		   prom_rev,
 		   romvec->pv_printrev >> 16,
-		   (short) romvec->pv_printrev,
+		   romvec->pv_printrev & 0xffff,
 		   &cputypval,
-		   linux_num_cpus,
+		   num_possible_cpus(),
 		   num_online_cpus()
 #ifndef CONFIG_SMP
-		   , loops_per_jiffy/(500000/HZ),
-		   (loops_per_jiffy/(5000/HZ)) % 100
+		   , cpu_data(0).udelay_val/(500000/HZ),
+		   (cpu_data(0).udelay_val/(5000/HZ)) % 100,
+		   cpu_data(0).clock_tick
 #endif
 		);
 
 #ifdef CONFIG_SMP
-	smp_bogo_info(m);
+	smp_bogo(m);
 #endif
 	mmu_info(m);
 #ifdef CONFIG_SMP

arch/sparc/kernel/smp.c

@@ -2,6 +2,7 @@
  *
  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ * Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org)
  */
 
 #include <asm/head.h>
@@ -32,26 +33,15 @@
 #include <asm/hardirq.h>
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
+#include <asm/cpudata.h>
 
 #define __KERNEL_SYSCALLS__
 #include <linux/unistd.h>
 
-#define IRQ_RESCHEDULE		13
-#define IRQ_STOP_CPU		14
-#define IRQ_CROSS_CALL		15
-
 volatile int smp_processors_ready = 0;
-unsigned long cpu_present_map = 0;
 int smp_num_cpus = 1;
 int smp_threads_ready=0;
-unsigned char mid_xlate[NR_CPUS] = { 0, 0, 0, 0, };
 volatile unsigned long cpu_callin_map[NR_CPUS] __initdata = {0,};
-#ifdef NOTUSED
-volatile unsigned long smp_spinning[NR_CPUS] = { 0, };
-#endif
-unsigned long smp_proc_in_lock[NR_CPUS] = { 0, };
-struct cpuinfo_sparc cpu_data[NR_CPUS];
-unsigned long cpu_offset[NR_CPUS];
 unsigned char boot_cpu_id = 0;
 unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */
 int smp_activated = 0;
@@ -59,6 +49,10 @@ volatile int __cpu_number_map[NR_CPUS];
 volatile int __cpu_logical_map[NR_CPUS];
 cycles_t cacheflush_time = 0; /* XXX */
 
+cpumask_t cpu_online_map = CPU_MASK_NONE;
+atomic_t sparc_num_cpus_possible = ATOMIC_INIT(0);
+cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
+
 /* The only guaranteed locking primitive available on all Sparc
  * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
  * places the current byte at the effective address into dest_reg and
@@ -75,40 +69,23 @@ volatile unsigned long ipi_count;
 volatile int smp_process_available=0;
 volatile int smp_commenced = 0;
 
-/* Not supported on Sparc yet. */
-void __init smp_setup(char *str, int *ints)
-{
-}
-
-/*
- *	The bootstrap kernel entry code has set these up. Save them for
- *	a given CPU
- */
-
 void __init smp_store_cpu_info(int id)
 {
-	cpu_data[id].udelay_val = loops_per_jiffy; /* this is it on sparc. */
-}
+	int cpu_node;
 
-void __init smp_commence(void)
-{
-	/*
-	 *	Lets the callin's below out of their loop.
-	 */
-	local_flush_cache_all();
-	local_flush_tlb_all();
-	smp_commenced = 1;
-	local_flush_cache_all();
-	local_flush_tlb_all();
-}
+	cpu_data(id).udelay_val = loops_per_jiffy;
 
-extern int cpu_idle(void);
+	cpu_find_by_mid(id, &cpu_node);
+	cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
+						     "clock-frequency", 0);
+	cpu_data(id).prom_node = cpu_node;
+	cpu_data(id).mid = cpu_get_hwmid(cpu_node);
+	if (cpu_data(id).mid < 0)
+		panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);
+}
 
-/* Activate a secondary processor. */
-int start_secondary(void *unused)
+void __init smp_cpus_done(unsigned int max_cpus)
 {
-	prom_printf("Start secondary called. Should not happen\n");
-	return cpu_idle();
 }
 
 void cpu_panic(void)
@@ -117,11 +94,6 @@ void cpu_panic(void)
 	panic("SMP bolixed\n");
 }
 
-/*
- *	Cycle through the processors asking the PROM to start each one.
- */
- 
-extern struct prom_cpuinfo linux_cpus[NR_CPUS];
 struct linux_prom_registers smp_penguin_ctable __initdata = { 0 };
 
 void __init smp_boot_cpus(void)
@@ -137,12 +109,11 @@ void __init smp_boot_cpus(void)
 
 void smp_send_reschedule(int cpu)
 {
-	smp_message_pass (cpu, MSG_RESCHEDULE, 0, 0);
+	/* See sparc64 */
 }
 
 void smp_send_stop(void)
 {
-	smp_message_pass (MSG_ALL_BUT_SELF, MSG_STOP_CPU, 0, 0);
 }
 
 void smp_flush_cache_all(void)
@@ -245,22 +216,6 @@ void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
 	local_flush_sig_insns(mm, insn_addr);
 }
 
-/* Reschedule call back. */
-void smp_reschedule_irq(void)
-{
-	current->work.need_resched = 1;
-}
-
-/* Stopping processors. */
-void smp_stop_cpu_irq(void)
-{
-	local_irq_enable();
-	while(1)
-		barrier();
-}
-
-unsigned int prof_multiplier[NR_CPUS];
-unsigned int prof_counter[NR_CPUS];
 extern unsigned int lvl14_resolution;
 
 /* /proc/profile writes can call this, don't __init it please. */
@@ -277,27 +232,42 @@ int setup_profiling_timer(unsigned int multiplier)
 
 	spin_lock_irqsave(&prof_setup_lock, flags);
 	for(i = 0; i < NR_CPUS; i++) {
-		if(cpu_present_map & (1 << i)) {
-			load_profile_irq(mid_xlate[i], lvl14_resolution / multiplier);
-			prof_multiplier[i] = multiplier;
-		}
+		if (cpu_possible(i))
+			load_profile_irq(i, lvl14_resolution / multiplier);
+		prof_multiplier(i) = multiplier;
 	}
 	spin_unlock_irqrestore(&prof_setup_lock, flags);
 
 	return 0;
 }
 
-void smp_bogo_info(struct seq_file *m)
+void __init smp_prepare_cpus(unsigned int maxcpus)
+{
+}
+
+void __devinit smp_prepare_boot_cpu(void)
+{
+	current_thread_info()->cpu = hard_smp_processor_id();
+	cpu_set(smp_processor_id(), cpu_online_map);
+	cpu_set(smp_processor_id(), phys_cpu_present_map);
+}
+
+int __devinit __cpu_up(unsigned int cpu)
+{
+	panic("smp doesn't work\n");
+}
+
+void smp_bogo(struct seq_file *m)
 {
 	int i;
 	
 	for (i = 0; i < NR_CPUS; i++) {
-		if (cpu_present_map & (1 << i))
+		if (cpu_online(i))
 			seq_printf(m,
 				   "Cpu%dBogo\t: %lu.%02lu\n", 
 				   i,
-				   cpu_data[i].udelay_val/(500000/HZ),
-				   (cpu_data[i].udelay_val/(5000/HZ))%100);
+				   cpu_data(i).udelay_val/(500000/HZ),
+				   (cpu_data(i).udelay_val/(5000/HZ))%100);
 	}
 }
 
@@ -305,8 +275,9 @@ void smp_info(struct seq_file *m)
 {
 	int i;
 
+	seq_printf(m, "State:\n");
 	for (i = 0; i < NR_CPUS; i++) {
-		if (cpu_present_map & (1 << i))
+		if (cpu_online(i))
 			seq_printf(m, "CPU%d\t\t: online\n", i);
 	}
 }

arch/sparc/kernel/sun4d_irq.c

@@ -472,9 +472,9 @@ static void sun4d_load_profile_irq(int cpu, unsigned int limit)
 static void __init sun4d_init_timers(irqreturn_t (*counter_fn)(int, void *, struct pt_regs *))
 {
 	int irq;
-	extern struct prom_cpuinfo linux_cpus[NR_CPUS];
 	int cpu;
 	struct resource r;
+	int mid;
 
 	/* Map the User Timer registers. */
 	memset(&r, 0, sizeof(r));
@@ -503,8 +503,11 @@ static void __init sun4d_init_timers(irqreturn_t (*counter_fn)(int, void *, stru
 	/* Enable user timer free run for CPU 0 in BW */
 	/* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
 
-	for(cpu = 0; cpu < linux_num_cpus; cpu++)
-		sun4d_load_profile_irq((linux_cpus[cpu].mid >> 3), 0);
+	cpu = 0;
+	while (!cpu_find_by_instance(cpu, NULL, &mid)) {
+		sun4d_load_profile_irq(mid >> 3, 0);
+		cpu++;
+	}
 		
 #ifdef CONFIG_SMP
 	{

arch/sparc/kernel/sun4d_smp.c

@@ -18,6 +18,7 @@
 #include <linux/init.h>
 #include <linux/spinlock.h>
 #include <linux/mm.h>
+#include <linux/swap.h>
 
 #include <asm/ptrace.h>
 #include <asm/atomic.h>
@@ -31,6 +32,9 @@
 #include <asm/hardirq.h>
 #include <asm/sbus.h>
 #include <asm/sbi.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
+#include <asm/cpudata.h>
 
 #define __KERNEL_SYSCALLS__
 #include <linux/unistd.h>
@@ -38,7 +42,6 @@
 #define IRQ_CROSS_CALL		15
 
 extern ctxd_t *srmmu_ctx_table_phys;
-extern int linux_num_cpus;
 
 extern void calibrate_delay(void);
 
@@ -47,9 +50,7 @@ extern unsigned long cpu_present_map;
 extern int smp_num_cpus;
 static int smp_highest_cpu;
 extern int smp_threads_ready;
-extern unsigned char mid_xlate[NR_CPUS];
 extern volatile unsigned long cpu_callin_map[NR_CPUS];
-extern unsigned long smp_proc_in_lock[NR_CPUS];
 extern struct cpuinfo_sparc cpu_data[NR_CPUS];
 extern unsigned long cpu_offset[NR_CPUS];
 extern unsigned char boot_cpu_id;
@@ -161,7 +162,6 @@ extern int start_secondary(void *unused);
  *	Cycle through the processors asking the PROM to start each one.
  */
  
-extern struct prom_cpuinfo linux_cpus[NR_CPUS];
 extern struct linux_prom_registers smp_penguin_ctable;
 extern unsigned long trapbase_cpu1[];
 extern unsigned long trapbase_cpu2[];
@@ -170,34 +170,34 @@ extern unsigned long trapbase_cpu3[];
 void __init smp4d_boot_cpus(void)
 {
 	int cpucount = 0;
-	int i = 0;
+	int i, mid;
 
 	printk("Entering SMP Mode...\n");
 	
 	for (i = 0; i < NR_CPUS; i++)
-		cpu_offset[i] = (char *)&cpu_data[i] - (char *)&cpu_data;
+		cpu_offset[i] = (char *)&(cpu_data(i)) - (char *)&(cpu_data(0));
 		
 	if (boot_cpu_id)
 		current_set[0] = NULL;
 
 	local_irq_enable();
 	cpu_present_map = 0;
-	for(i=0; i < linux_num_cpus; i++)
-		cpu_present_map |= (1<<linux_cpus[i].mid);
+
+	/* XXX This whole thing has to go.  See sparc64. */
+	for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
+		cpu_present_map |= (1<<mid);
 	SMP_PRINTK(("cpu_present_map %08lx\n", cpu_present_map));
 	for(i=0; i < NR_CPUS; i++)
 		__cpu_number_map[i] = -1;
 	for(i=0; i < NR_CPUS; i++)
 		__cpu_logical_map[i] = -1;
-	for(i=0; i < NR_CPUS; i++)
-		mid_xlate[i] = i;
 	__cpu_number_map[boot_cpu_id] = 0;
 	__cpu_logical_map[0] = boot_cpu_id;
-	current->cpu = boot_cpu_id;
+	current_thread_info()->cpu = boot_cpu_id;
 	smp_store_cpu_info(boot_cpu_id);
 	smp_setup_percpu_timer();
 	local_flush_cache_all();
-	if(linux_num_cpus == 1)
+	if (cpu_find_by_instance(1, NULL, NULL))
 		return;  /* Not an MP box. */
 	SMP_PRINTK(("Iterating over CPUs\n"));
 	for(i = 0; i < NR_CPUS; i++) {
@@ -218,15 +218,14 @@ void __init smp4d_boot_cpus(void)
 
 			p = prev_task(&init_task);
 
-			p->cpu = i;
+			init_idle(p, i);
 
-			current_set[i] = p;
+			current_set[i] = p->thread_info;
 
 			unhash_process(p);
 
-			for (no = 0; no < linux_num_cpus; no++)
-				if (linux_cpus[no].mid == i)
-					break;
+			for (no = 0; !cpu_find_by_instance(no, NULL, &mid)
+				     && mid != i; no++) ;
 
 			/*
 			 * Initialize the contexts table
@@ -238,9 +237,9 @@ void __init smp4d_boot_cpus(void)
 			smp_penguin_ctable.reg_size = 0;
 
 			/* whirrr, whirrr, whirrrrrrrrr... */
-			SMP_PRINTK(("Starting CPU %d at %p task %d node %08x\n", i, entry, cpucount, linux_cpus[no].prom_node));
+			SMP_PRINTK(("Starting CPU %d at %p task %d node %08x\n", i, entry, cpucount, cpu_data(no).prom_node));
 			local_flush_cache_all();
-			prom_startcpu(linux_cpus[no].prom_node,
+			prom_startcpu(cpu_data(no).prom_node,
 				      &smp_penguin_ctable, 0, (char *)entry);
 				      
 			SMP_PRINTK(("prom_startcpu returned :)\n"));
@@ -275,7 +274,7 @@ void __init smp4d_boot_cpus(void)
 		
 		for(i = 0; i < NR_CPUS; i++) {
 			if(cpu_present_map & (1 << i)) {
-				bogosum += cpu_data[i].udelay_val;
+				bogosum += cpu_data(i).udelay_val;
 				smp_highest_cpu = i;
 			}
 		}
@@ -337,12 +336,12 @@ void smp4d_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
 
 		{
 			/* If you make changes here, make sure gcc generates proper code... */
-			smpfunc_t f asm("i0") = func;
-			unsigned long a1 asm("i1") = arg1;
-			unsigned long a2 asm("i2") = arg2;
-			unsigned long a3 asm("i3") = arg3;
-			unsigned long a4 asm("i4") = arg4;
-			unsigned long a5 asm("i5") = arg5;
+			register smpfunc_t f asm("i0") = func;
+			register unsigned long a1 asm("i1") = arg1;
+			register unsigned long a2 asm("i2") = arg2;
+			register unsigned long a3 asm("i3") = arg3;
+			register unsigned long a4 asm("i4") = arg4;
+			register unsigned long a5 asm("i5") = arg5;
 
 			__asm__ __volatile__(
 				"std %0, [%6]\n\t"
@@ -429,11 +428,11 @@ void smp4d_message_pass(int target, int msg, unsigned long data, int wait)
 	panic("Bogon SMP message pass.");
 }
 
-extern unsigned int prof_multiplier[NR_CPUS];
-extern unsigned int prof_counter[NR_CPUS];
-
 extern void sparc_do_profile(unsigned long pc, unsigned long o7);
 
+#define prof_multiplier(__cpu)		cpu_data(__cpu).multiplier
+#define prof_counter(__cpu)		cpu_data(__cpu).counter
+
 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
 {
 	int cpu = hard_smp4d_processor_id();
@@ -454,14 +453,14 @@ void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
 	if(!user_mode(regs))
 		sparc_do_profile(regs->pc, regs->u_regs[UREG_RETPC]);
 
-	if(!--prof_counter[cpu]) {
+	if(!--prof_counter(cpu)) {
 		int user = user_mode(regs);
 
 		irq_enter();
 		update_process_times(user);
 		irq_exit();
 
-		prof_counter[cpu] = prof_multiplier[cpu];
+		prof_counter(cpu) = prof_multiplier(cpu);
 	}
 }
 
@@ -471,7 +470,7 @@ static void __init smp_setup_percpu_timer(void)
 {
 	int cpu = hard_smp4d_processor_id();
 
-	prof_counter[cpu] = prof_multiplier[cpu] = 1;
+	prof_counter(cpu) = prof_multiplier(cpu) = 1;
 	load_profile_irq(cpu, lvl14_resolution);
 }
 

arch/sparc/kernel/sun4m_irq.c

@@ -293,7 +293,7 @@ static void __init sun4m_init_timers(irqreturn_t (*counter_fn)(int, void *, stru
 		prom_halt();
 	}
    
-	if(linux_num_cpus > 1) {
+	if (!cpu_find_by_instance(1, NULL, NULL)) {
 		for(cpu = 0; cpu < 4; cpu++)
 			sun4m_timers->cpu_timers[cpu].l14_timer_limit = 0;
 		sun4m_interrupts->set = SUN4M_INT_E14;
@@ -327,6 +327,7 @@ void __init sun4m_init_IRQ(void)
 	struct linux_prom_registers int_regs[PROMREG_MAX];
 	int num_regs;
 	struct resource r;
+	int mid;
     
 	local_irq_disable();
 	if((ie_node = prom_searchsiblings(prom_getchild(prom_root_node), "obio")) == 0 ||
@@ -364,10 +365,10 @@ void __init sun4m_init_IRQ(void)
 	sbus_ioremap(&r, 0, int_regs[4].reg_size, "interrupts_system");
 
 	sun4m_interrupts->set = ~SUN4M_INT_MASKALL;
-	for (i=0; i<linux_num_cpus; i++)
-		sun4m_interrupts->cpu_intregs[i].clear = ~0x17fff;
+	for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
+		sun4m_interrupts->cpu_intregs[mid].clear = ~0x17fff;
 
-	if (linux_num_cpus > 1) {
+	if (!cpu_find_by_instance(1, NULL, NULL)) {
 		/* system wide interrupts go to cpu 0, this should always
 		 * be safe because it is guaranteed to be fitted or OBP doesn't
 		 * come up

arch/sparc/kernel/sun4m_smp.c

@@ -15,6 +15,9 @@
 #include <linux/init.h>
 #include <linux/spinlock.h>
 #include <linux/mm.h>
+#include <linux/swap.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
 
 #include <asm/ptrace.h>
 #include <asm/atomic.h>
@@ -26,6 +29,7 @@
 #include <asm/pgtable.h>
 #include <asm/oplib.h>
 #include <asm/hardirq.h>
+#include <asm/cpudata.h>
 
 #define __KERNEL_SYSCALLS__
 #include <linux/unistd.h>
@@ -35,7 +39,6 @@
 #define IRQ_CROSS_CALL		15
 
 extern ctxd_t *srmmu_ctx_table_phys;
-extern int linux_num_cpus;
 
 extern void calibrate_delay(void);
 
@@ -43,10 +46,7 @@ extern volatile int smp_processors_ready;
 extern unsigned long cpu_present_map;
 extern int smp_num_cpus;
 extern int smp_threads_ready;
-extern unsigned char mid_xlate[NR_CPUS];
 extern volatile unsigned long cpu_callin_map[NR_CPUS];
-extern unsigned long smp_proc_in_lock[NR_CPUS];
-extern struct cpuinfo_sparc cpu_data[NR_CPUS];
 extern unsigned long cpu_offset[NR_CPUS];
 extern unsigned char boot_cpu_id;
 extern int smp_activated;
@@ -83,7 +83,7 @@ void __init smp4m_callin(void)
 	local_flush_cache_all();
 	local_flush_tlb_all();
 
-	set_irq_udt(mid_xlate[boot_cpu_id]);
+	set_irq_udt(boot_cpu_id);
 
 	/* Get our local ticker going. */
 	smp_setup_percpu_timer();
@@ -137,7 +137,6 @@ extern int start_secondary(void *unused);
  *	Cycle through the processors asking the PROM to start each one.
  */
  
-extern struct prom_cpuinfo linux_cpus[NR_CPUS];
 extern struct linux_prom_registers smp_penguin_ctable;
 extern unsigned long trapbase_cpu1[];
 extern unsigned long trapbase_cpu2[];
@@ -146,33 +145,32 @@ extern unsigned long trapbase_cpu3[];
 void __init smp4m_boot_cpus(void)
 {
 	int cpucount = 0;
-	int i = 0;
-	int first, prev;
+	int i, mid;
 
 	printk("Entering SMP Mode...\n");
 
 	local_irq_enable();
 	cpu_present_map = 0;
 
-	for(i=0; i < linux_num_cpus; i++)
-		cpu_present_map |= (1<<i);
+	for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
+		cpu_present_map |= (1<<mid);
 
+	/* XXX cpu_offset is broken -Keith */
 	for(i=0; i < NR_CPUS; i++) {
-		cpu_offset[i] = (char *)&cpu_data[i] - (char *)&cpu_data;
+		cpu_offset[i] = (char *)&(cpu_data(i)) - (char *)&(cpu_data(0));
 		__cpu_number_map[i] = -1;
 		__cpu_logical_map[i] = -1;
 	}
 
-	mid_xlate[boot_cpu_id] = (linux_cpus[boot_cpu_id].mid & ~8);
 	__cpu_number_map[boot_cpu_id] = 0;
 	__cpu_logical_map[0] = boot_cpu_id;
-	current->cpu = boot_cpu_id;
+	current_thread_info()->cpu = boot_cpu_id;
 
 	smp_store_cpu_info(boot_cpu_id);
-	set_irq_udt(mid_xlate[boot_cpu_id]);
+	set_irq_udt(boot_cpu_id);
 	smp_setup_percpu_timer();
 	local_flush_cache_all();
-	if(linux_num_cpus == 1)
+	if(cpu_find_by_instance(1, NULL, NULL))
 		return;  /* Not an MP box. */
 	for(i = 0; i < NR_CPUS; i++) {
 		if(i == boot_cpu_id)
@@ -191,9 +189,9 @@ void __init smp4m_boot_cpus(void)
 
 			p = prev_task(&init_task);
 
-			p->cpu = i;
+			init_idle(p, i);
 
-			current_set[i] = p;
+			current_set[i] = p->thread_info;
 
 			unhash_process(p);
 
@@ -211,9 +209,8 @@ void __init smp4m_boot_cpus(void)
 
 			/* whirrr, whirrr, whirrrrrrrrr... */
 			printk("Starting CPU %d at %p\n", i, entry);
-			mid_xlate[i] = (linux_cpus[i].mid & ~8);
 			local_flush_cache_all();
-			prom_startcpu(linux_cpus[i].prom_node,
+			prom_startcpu(cpu_data(i).prom_node,
 				      &smp_penguin_ctable, 0, (char *)entry);
 
 			/* wheee... it's going... */
@@ -244,7 +241,7 @@ void __init smp4m_boot_cpus(void)
 		unsigned long bogosum = 0;
 		for(i = 0; i < NR_CPUS; i++) {
 			if(cpu_present_map & (1 << i))
-				bogosum += cpu_data[i].udelay_val;
+				bogosum += cpu_data(i).udelay_val;
 		}
 		printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n",
 		       cpucount + 1,
@@ -254,20 +251,6 @@ void __init smp4m_boot_cpus(void)
 		smp_num_cpus = cpucount + 1;
 	}
 
-	/* Setup CPU list for IRQ distribution scheme. */
-	first = prev = -1;
-	for(i = 0; i < NR_CPUS; i++) {
-		if(cpu_present_map & (1 << i)) {
-			if(first == -1)
-				first = i;
-			if(prev != -1)
-				cpu_data[prev].next = i;
-			cpu_data[i].mid = mid_xlate[i];
-			prev = i;
-		}
-	}
-	cpu_data[prev].next = first;
-	
 	/* Free unneeded trap tables */
 	if (!(cpu_present_map & (1 << 1))) {
 		ClearPageReserved(virt_to_page(trapbase_cpu1));
@@ -298,11 +281,11 @@ void __init smp4m_boot_cpus(void)
 /* At each hardware IRQ, we get this called to forward IRQ reception
  * to the next processor.  The caller must disable the IRQ level being
  * serviced globally so that there are no double interrupts received.
+ *
+ * XXX See sparc64 irq.c.
  */
 void smp4m_irq_rotate(int cpu)
 {
-	if(smp_processors_ready)
-		set_irq_udt(cpu_data[cpu_data[cpu].next].mid);
 }
 
 /* Cross calls, in order to work efficiently and atomically do all
@@ -334,10 +317,10 @@ void smp4m_message_pass(int target, int msg, unsigned long data, int wait)
 			mask &= ~(1 << me);
 		for(i = 0; i < 4; i++) {
 			if(mask & (1 << i))
-				set_cpu_int(mid_xlate[i], irq);
+				set_cpu_int(i, irq);
 		}
 	} else {
-		set_cpu_int(mid_xlate[target], irq);
+		set_cpu_int(target, irq);
 	}
 	smp_cpu_in_msg[me]--;
 
@@ -388,7 +371,7 @@ void smp4m_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
 				if(mask & (1 << i)) {
 					ccall_info.processors_in[i] = 0;
 					ccall_info.processors_out[i] = 0;
-					set_cpu_int(mid_xlate[i], IRQ_CROSS_CALL);
+					set_cpu_int(i, IRQ_CROSS_CALL);
 				} else {
 					ccall_info.processors_in[i] = 1;
 					ccall_info.processors_out[i] = 1;
@@ -427,28 +410,28 @@ void smp4m_cross_call_irq(void)
 	ccall_info.processors_out[i] = 1;
 }
 
-extern unsigned int prof_multiplier[NR_CPUS];
-extern unsigned int prof_counter[NR_CPUS];
-
 extern void sparc_do_profile(unsigned long pc, unsigned long o7);
 
+#define prof_multiplier(__cpu)		cpu_data(__cpu).multiplier
+#define prof_counter(__cpu)		cpu_data(__cpu).counter
+
 void smp4m_percpu_timer_interrupt(struct pt_regs *regs)
 {
 	int cpu = smp_processor_id();
 
-	clear_profile_irq(mid_xlate[cpu]);
+	clear_profile_irq(cpu);
 
 	if(!user_mode(regs))
 		sparc_do_profile(regs->pc, regs->u_regs[UREG_RETPC]);
 
-	if(!--prof_counter[cpu]) {
+	if(!--prof_counter(cpu)) {
 		int user = user_mode(regs);
 
 		irq_enter();
 		update_process_times(user);
 		irq_exit();
 
-		prof_counter[cpu] = prof_multiplier[cpu];
+		prof_counter(cpu) = prof_multiplier(cpu);
 	}
 }
 
@@ -458,8 +441,8 @@ static void __init smp_setup_percpu_timer(void)
 {
 	int cpu = smp_processor_id();
 
-	prof_counter[cpu] = prof_multiplier[cpu] = 1;
-	load_profile_irq(mid_xlate[cpu], lvl14_resolution);
+	prof_counter(cpu) = prof_multiplier(cpu) = 1;
+	load_profile_irq(cpu, lvl14_resolution);
 
 	if(cpu == boot_cpu_id)
 		enable_pil_irq(14);

arch/sparc/mm/srmmu.c

@@ -1230,8 +1230,6 @@ static inline void map_kernel(void)
 /* Paging initialization on the Sparc Reference MMU. */
 extern void sparc_context_init(int);
 
-extern int linux_num_cpus;
-
 void (*poke_srmmu)(void) __initdata = NULL;
 
 extern unsigned long bootmem_init(unsigned long *pages_avail);

include/asm-sparc/asmmacro.h

@@ -24,13 +24,10 @@
 	sethi	%hi(boot_cpu_id), %reg; \
 	ldub	[%reg + %lo(boot_cpu_id)], %reg;
 
-#define GET_PROCESSOR_MID(reg, tmp) \
+#define GET_PROCESSOR_MID(reg) \
 	rd	%tbr, %reg; \
-	sethi	%hi(mid_xlate), %tmp; \
 	srl	%reg, 12, %reg; \
-	or	%tmp, %lo(mid_xlate), %tmp; \
-	and	%reg, 3, %reg; \
-	ldub	[%tmp + %reg], %reg;
+	and	%reg, 3, %reg;
 
 #define GET_PROCESSOR_OFFSET(reg, tmp) \
 	GET_PROCESSOR_ID(reg) \

include/asm-sparc/bugs.h

-/*  $Id: bugs.h,v 1.5 1995/11/25 02:31:18 davem Exp $
+/*  $Id: bugs.h,v 1.1 1996/12/26 13:25:20 davem Exp $
  *  include/asm-sparc/bugs.h:  Sparc probes for various bugs.
  *
- *  Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
+ *  Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
  */
 
-static void check_bugs(void) { }
+#include <asm/cpudata.h>
+#include <linux/config.h>
+
+extern unsigned long loops_per_jiffy;
+
+static void check_bugs(void)
+{
+#ifndef CONFIG_SMP
+	cpu_data(0).udelay_val = loops_per_jiffy;
+#endif
+}

include/asm-sparc/oplib.h

@@ -306,6 +306,11 @@ extern void prom_apply_obio_ranges(struct linux_prom_registers *obioregs, int nr
 extern void prom_apply_generic_ranges(int node, int parent, 
 				      struct linux_prom_registers *sbusregs, int nregs);
 
+/* CPU probing helpers.  */
+int cpu_find_by_instance(int instance, int *prom_node, int *mid);
+int cpu_find_by_mid(int mid, int *prom_node);
+int cpu_get_hwmid(int prom_node);
+
 extern spinlock_t prom_lock;
 
 #endif /* !(__SPARC_OPLIB_H) */

include/asm-sparc/smp.h

@@ -15,17 +15,7 @@
 
 #include <linux/cpumask.h>
 
-/* PROM provided per-processor information we need
- * to start them all up.
- */
-
-struct prom_cpuinfo {
-	int prom_node;
-	int mid;
-};
-extern int linux_num_cpus;	/* number of CPUs probed  */
-
-#endif /* !(__ASSEMBLY__) */
+#endif /* __ASSEMBLY__ */
 
 #ifdef CONFIG_SMP
 
@@ -33,27 +23,18 @@ extern int linux_num_cpus;	/* number of CPUs probed  */
 
 #include <asm/ptrace.h>
 #include <asm/asi.h>
-
-extern struct prom_cpuinfo linux_cpus[NR_CPUS];
-
-/* Per processor Sparc parameters we need. */
-
-struct cpuinfo_sparc {
-	unsigned long udelay_val; /* that's it */
-	unsigned short next;
-	unsigned short mid;
-};
-
-extern struct cpuinfo_sparc cpu_data[NR_CPUS];
-extern unsigned long cpu_offset[NR_CPUS];
+#include <asm/atomic.h>
 
 /*
  *	Private routines/data
  */
  
 extern unsigned char boot_cpu_id;
-extern unsigned long cpu_present_map;
-#define cpu_online_map cpu_present_map
+extern cpumask_t phys_cpu_present_map;
+#define cpu_possible_map phys_cpu_present_map
+
+extern atomic_t sparc_num_cpus_possible;
+#define num_possible_cpus()	(atomic_read(&sparc_num_cpus_possible))
 
 typedef void (*smpfunc_t)(unsigned long, unsigned long, unsigned long,
 		       unsigned long, unsigned long);
@@ -70,7 +51,7 @@ void smp_boot_cpus(void);
 void smp_store_cpu_info(int);
 
 struct seq_file;
-void smp_bogo_info(struct seq_file *);
+void smp_bogo(struct seq_file *);
 void smp_info(struct seq_file *);
 
 BTFIXUPDEF_CALL(void, smp_cross_call, smpfunc_t, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long)
@@ -105,7 +86,6 @@ extern __inline__ int smp_call_function(void (*func)(void *info), void *info, in
 
 extern __volatile__ int __cpu_number_map[NR_CPUS];
 extern __volatile__ int __cpu_logical_map[NR_CPUS];
-extern unsigned long smp_proc_in_lock[NR_CPUS];
 
 extern __inline__ int cpu_logical_map(int cpu)
 {
@@ -189,7 +169,11 @@ extern __inline__ int hard_smp_processor_id(void)
 #define MBOX_IDLECPU2         0xFD
 #define MBOX_STOPCPU2         0xFE
 
-#endif /* !(CONFIG_SMP) */
+#else /* SMP */
+
+#define num_possible_cpus()	(1)
+
+#endif /* SMP */
 
 #define NO_PROC_ID            0xFF