2 * This file is subject to the terms and conditions of the GNU General
3 * Public License. See the file "COPYING" in the main directory of this
4 * archive for more details.
6 * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
7 * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/sched.h>
12 #include <linux/smp.h>
14 #include <linux/export.h>
15 #include <linux/cpumask.h>
18 #include <asm/pgtable.h>
20 #include <asm/sn/types.h>
21 #include <asm/sn/sn0/addrs.h>
22 #include <asm/sn/sn0/hubni.h>
23 #include <asm/sn/sn0/hubio.h>
24 #include <asm/sn/klconfig.h>
25 #include <asm/sn/ioc3.h>
26 #include <asm/mipsregs.h>
27 #include <asm/sn/gda.h>
28 #include <asm/sn/hub.h>
29 #include <asm/sn/intr.h>
30 #include <asm/current.h>
31 #include <asm/processor.h>
32 #include <asm/mmu_context.h>
33 #include <asm/thread_info.h>
34 #include <asm/sn/launch.h>
35 #include <asm/sn/sn_private.h>
36 #include <asm/sn/sn0/ip27.h>
37 #include <asm/sn/mapped_kernel.h>
39 #define CPU_NONE (cpuid_t)-1
41 static DECLARE_BITMAP(hub_init_mask, MAX_COMPACT_NODES);
42 nasid_t master_nasid = INVALID_NASID;
44 struct cpuinfo_ip27 sn_cpu_info[NR_CPUS];
45 EXPORT_SYMBOL_GPL(sn_cpu_info);
47 static void per_hub_init(nasid_t nasid)
49 struct hub_data *hub = hub_data(nasid);
51 cpumask_set_cpu(smp_processor_id(), &hub->h_cpus);
53 if (test_and_set_bit(nasid, hub_init_mask))
56 * Set CRB timeout at 5ms, (< PI timeout of 10ms)
58 REMOTE_HUB_S(nasid, IIO_ICTP, 0x800);
59 REMOTE_HUB_S(nasid, IIO_ICTO, 0xff);
63 #ifdef CONFIG_REPLICATE_EXHANDLERS
65 * If this is not a headless node initialization,
66 * copy over the caliased exception handlers.
68 if (get_nasid() == nasid) {
69 extern char except_vec2_generic, except_vec3_generic;
70 extern void build_tlb_refill_handler(void);
72 memcpy((void *)(CKSEG0 + 0x100), &except_vec2_generic, 0x80);
73 memcpy((void *)(CKSEG0 + 0x180), &except_vec3_generic, 0x80);
74 build_tlb_refill_handler();
75 memcpy((void *)(CKSEG0 + 0x100), (void *) CKSEG0, 0x80);
76 memcpy((void *)(CKSEG0 + 0x180), &except_vec3_generic, 0x100);
82 void per_cpu_init(void)
84 int cpu = smp_processor_id();
85 int slice = LOCAL_HUB_L(PI_CPU_NUM);
86 nasid_t nasid = get_nasid();
87 struct hub_data *hub = hub_data(nasid);
89 if (test_and_set_bit(slice, &hub->slice_map))
92 clear_c0_status(ST0_IM);
99 /* Install our NMI handler if symmon hasn't installed one. */
100 install_cpu_nmi_handler(cputoslice(cpu));
102 enable_percpu_irq(IP27_HUB_PEND0_IRQ, IRQ_TYPE_NONE);
103 enable_percpu_irq(IP27_HUB_PEND1_IRQ, IRQ_TYPE_NONE);
107 * get_nasid() returns the physical node id number of the caller.
112 return (nasid_t)((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_NODEID_MASK)
113 >> NSRI_NODEID_SHFT);
116 extern void ip27_reboot_setup(void);
118 void __init plat_mem_setup(void)
126 * hub_rtc init and cpu clock intr enabled for later calibrate_delay.
129 printk("IP27: Running on node %d.\n", nid);
131 p = LOCAL_HUB_L(PI_CPU_PRESENT_A) & 1;
132 e = LOCAL_HUB_L(PI_CPU_ENABLE_A) & 1;
133 printk("Node %d has %s primary CPU%s.\n", nid,
135 e ? ", CPU is running" : "");
137 p = LOCAL_HUB_L(PI_CPU_PRESENT_B) & 1;
138 e = LOCAL_HUB_L(PI_CPU_ENABLE_B) & 1;
139 printk("Node %d has %s secondary CPU%s.\n", nid,
141 e ? ", CPU is running" : "");
144 * Try to catch kernel missconfigurations and give user an
145 * indication what option to select.
147 n_mode = LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_MORENODES_MASK;
148 printk("Machine is in %c mode.\n", n_mode ? 'N' : 'M');
149 #ifdef CONFIG_SGI_SN_N_MODE
151 panic("Kernel compiled for M mode.");
154 panic("Kernel compiled for N mode.");
157 ioport_resource.start = 0;
158 ioport_resource.end = ~0UL;
159 set_io_port_base(IO_BASE);