Linux Kernel  3.7.1
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config.c
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1 /*
2  * linux/arch/m68k/sun3/config.c
3  *
4  * Copyright (C) 1996,1997 Pekka Pietik{inen
5  *
6  * This file is subject to the terms and conditions of the GNU General Public
7  * License. See the file COPYING in the main directory of this archive
8  * for more details.
9  */
10 
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/mm.h>
14 #include <linux/seq_file.h>
15 #include <linux/tty.h>
16 #include <linux/console.h>
17 #include <linux/init.h>
18 #include <linux/bootmem.h>
19 
20 #include <asm/oplib.h>
21 #include <asm/setup.h>
22 #include <asm/contregs.h>
23 #include <asm/movs.h>
24 #include <asm/pgtable.h>
25 #include <asm/pgalloc.h>
26 #include <asm/sun3-head.h>
27 #include <asm/sun3mmu.h>
28 #include <asm/rtc.h>
29 #include <asm/machdep.h>
30 #include <asm/idprom.h>
31 #include <asm/intersil.h>
32 #include <asm/irq.h>
33 #include <asm/sections.h>
34 #include <asm/segment.h>
35 #include <asm/sun3ints.h>
36 
38 
39 extern unsigned long sun3_gettimeoffset(void);
40 static void sun3_sched_init(irq_handler_t handler);
41 extern void sun3_get_model (char* model);
42 extern int sun3_hwclk(int set, struct rtc_time *t);
43 
44 volatile char* clock_va;
45 extern unsigned long availmem;
46 unsigned long num_pages;
47 
48 static void sun3_get_hardware_list(struct seq_file *m)
49 {
50  seq_printf(m, "PROM Revision:\t%s\n", romvec->pv_monid);
51 }
52 
53 void __init sun3_init(void)
54 {
55  unsigned char enable_register;
56  int i;
57 
60  m68k_fputype = FPU_68881; /* mc68881 actually */
62  clock_va = (char *) 0xfe06000; /* dark */
63  sun3_intreg = (unsigned char *) 0xfe0a000; /* magic */
65 
67 
68  GET_CONTROL_BYTE(AC_SENABLE,enable_register);
69  enable_register |= 0x50; /* Enable FPU */
70  SET_CONTROL_BYTE(AC_SENABLE,enable_register);
71  GET_CONTROL_BYTE(AC_SENABLE,enable_register);
72 
73  /* This code looks suspicious, because it doesn't subtract
74  memory belonging to the kernel from the available space */
75 
76 
78 
79  /* Reserve important PMEGS */
80  /* FIXME: These should be probed instead of hardcoded */
81 
82  for (i=0; i<8; i++) /* Kernel PMEGs */
83  sun3_reserved_pmeg[i] = 1;
84 
85  sun3_reserved_pmeg[247] = 1; /* ROM mapping */
86  sun3_reserved_pmeg[248] = 1; /* AMD Ethernet */
87  sun3_reserved_pmeg[251] = 1; /* VB area */
88  sun3_reserved_pmeg[254] = 1; /* main I/O */
89 
90  sun3_reserved_pmeg[249] = 1;
91  sun3_reserved_pmeg[252] = 1;
92  sun3_reserved_pmeg[253] = 1;
94 }
95 
96 /* Without this, Bad Things happen when something calls arch_reset. */
97 static void sun3_reboot (void)
98 {
99  prom_reboot ("vmlinux");
100 }
101 
102 static void sun3_halt (void)
103 {
104  prom_halt ();
105 }
106 
107 /* sun3 bootmem allocation */
108 
109 static void __init sun3_bootmem_alloc(unsigned long memory_start,
110  unsigned long memory_end)
111 {
112  unsigned long start_page;
113 
114  /* align start/end to page boundaries */
115  memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK);
116  memory_end = memory_end & PAGE_MASK;
117 
118  start_page = __pa(memory_start) >> PAGE_SHIFT;
119  num_pages = __pa(memory_end) >> PAGE_SHIFT;
120 
121  high_memory = (void *)memory_end;
123 
124  m68k_setup_node(0);
125  availmem += init_bootmem_node(NODE_DATA(0), start_page, 0, num_pages);
126  availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK;
127 
128  free_bootmem(__pa(availmem), memory_end - (availmem));
129 }
130 
131 
132 void __init config_sun3(void)
133 {
134  unsigned long memory_start, memory_end;
135 
136  printk("ARCH: SUN3\n");
137  idprom_init();
138 
139  /* Subtract kernel memory from available memory */
140 
141  mach_sched_init = sun3_sched_init;
143  mach_reset = sun3_reboot;
147  mach_halt = sun3_halt;
148  mach_get_hardware_list = sun3_get_hardware_list;
149 
150  memory_start = ((((unsigned long)_end) + 0x2000) & ~0x1fff);
151 // PROM seems to want the last couple of physical pages. --m
152  memory_end = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE;
153 
154  m68k_num_memory=1;
155  m68k_memory[0].size=*(romvec->pv_sun3mem);
156 
157  sun3_bootmem_alloc(memory_start, memory_end);
158 }
159 
160 static void __init sun3_sched_init(irq_handler_t timer_routine)
161 {
165  intersil_clear();
166  sun3_enable_irq(5);
169  intersil_clear();
170 }
171