1 /* !! 1 // SPDX-License-Identifier: GPL-2.0
2 * Nios2-specific parts of system setup !! 2 #ifdef CONFIG_MMU
3 * !! 3 #include "setup_mm.c"
4 * Copyright (C) 2010 Tobias Klauser <tklauser !! 4 #else
5 * Copyright (C) 2004 Microtronix Datacom Ltd. !! 5 #include "setup_no.c"
6 * Copyright (C) 2001 Vic Phillips <vic@microt <<
7 * <<
8 * This file is subject to the terms and condi <<
9 * License. See the file "COPYING" in the main <<
10 * for more details. <<
11 */ <<
12 <<
13 #include <linux/export.h> <<
14 #include <linux/kernel.h> <<
15 #include <linux/mm.h> <<
16 #include <linux/sched.h> <<
17 #include <linux/sched/task.h> <<
18 #include <linux/console.h> <<
19 #include <linux/memblock.h> <<
20 #include <linux/initrd.h> <<
21 #include <linux/of_fdt.h> <<
22 <<
23 #include <asm/mmu_context.h> <<
24 #include <asm/sections.h> <<
25 #include <asm/setup.h> <<
26 #include <asm/cpuinfo.h> <<
27 <<
28 unsigned long memory_start; <<
29 EXPORT_SYMBOL(memory_start); <<
30 <<
31 unsigned long memory_end; <<
32 EXPORT_SYMBOL(memory_end); <<
33 <<
34 static struct pt_regs fake_regs = { 0, 0, 0, 0 <<
35 0, 0, <<
36 0}; <<
37 <<
38 /* Copy a short hook instruction sequence to t <<
39 static inline void copy_exception_handler(unsi <<
40 { <<
41 unsigned int start = (unsigned int) ex <<
42 volatile unsigned int tmp = 0; <<
43 <<
44 if (start == addr) { <<
45 /* The CPU exception address a <<
46 return; <<
47 } <<
48 <<
49 __asm__ __volatile__ ( <<
50 "ldw %2,0(%0)\n" <<
51 "stw %2,0(%1)\n" <<
52 "ldw %2,4(%0)\n" <<
53 "stw %2,4(%1)\n" <<
54 "ldw %2,8(%0)\n" <<
55 "stw %2,8(%1)\n" <<
56 "flushd 0(%1)\n" <<
57 "flushd 4(%1)\n" <<
58 "flushd 8(%1)\n" <<
59 "flushi %1\n" <<
60 "addi %1,%1,4\n" <<
61 "flushi %1\n" <<
62 "addi %1,%1,4\n" <<
63 "flushi %1\n" <<
64 "flushp\n" <<
65 : /* no output registers */ <<
66 : "r" (start), "r" (addr), "r" <<
67 : "memory" <<
68 ); <<
69 } <<
70 <<
71 /* Copy the fast TLB miss handler */ <<
72 static inline void copy_fast_tlb_miss_handler( <<
73 { <<
74 unsigned int start = (unsigned int) fa <<
75 unsigned int end = (unsigned int) fast <<
76 volatile unsigned int tmp = 0; <<
77 <<
78 __asm__ __volatile__ ( <<
79 "1:\n" <<
80 " ldw %3,0(%0)\n" <<
81 " stw %3,0(%1)\n" <<
82 " flushd 0(%1)\n" <<
83 " flushi %1\n" <<
84 " flushp\n" <<
85 " addi %0,%0,4\n" <<
86 " addi %1,%1,4\n" <<
87 " bne %0,%2,1b\n" <<
88 : /* no output registers */ <<
89 : "r" (start), "r" (addr), "r" <<
90 : "memory" <<
91 ); <<
92 } <<
93 <<
94 /* <<
95 * save args passed from u-boot, called from h <<
96 * <<
97 * @r4: NIOS magic <<
98 * @r5: initrd start <<
99 * @r6: initrd end or fdt <<
100 * @r7: kernel command line <<
101 */ <<
102 asmlinkage void __init nios2_boot_init(unsigne <<
103 unsigne <<
104 { <<
105 unsigned dtb_passed = 0; <<
106 char cmdline_passed[COMMAND_LINE_SIZE] <<
107 <<
108 #if defined(CONFIG_NIOS2_PASS_CMDLINE) <<
109 if (r4 == 0x534f494e) { /* r4 is magic <<
110 #if defined(CONFIG_BLK_DEV_INITRD) <<
111 if (r5) { /* initramfs */ <<
112 initrd_start = r5; <<
113 initrd_end = r6; <<
114 } <<
115 #endif /* CONFIG_BLK_DEV_INITRD */ <<
116 dtb_passed = r6; <<
117 <<
118 if (r7) <<
119 strscpy(cmdline_passed <<
120 } <<
121 #endif 6 #endif
122 7
123 early_init_devtree((void *)dtb_passed) !! 8 #if IS_ENABLED(CONFIG_INPUT_M68K_BEEP)
124 !! 9 void (*mach_beep)(unsigned int, unsigned int);
125 #ifndef CONFIG_CMDLINE_FORCE !! 10 EXPORT_SYMBOL(mach_beep);
126 if (cmdline_passed[0]) <<
127 strscpy(boot_command_line, cmd <<
128 #ifdef CONFIG_NIOS2_CMDLINE_IGNORE_DTB <<
129 else <<
130 strscpy(boot_command_line, CON <<
131 #endif 11 #endif
132 #endif <<
133 <<
134 parse_early_param(); <<
135 } <<
136 <<
137 static void __init find_limits(unsigned long * <<
138 unsigned long * <<
139 { <<
140 *max_low = PFN_DOWN(memblock_get_curre <<
141 *min = PFN_UP(memblock_start_of_DRAM() <<
142 *max_high = PFN_DOWN(memblock_end_of_D <<
143 } <<
144 <<
145 void __init setup_arch(char **cmdline_p) <<
146 { <<
147 console_verbose(); <<
148 <<
149 memory_start = memblock_start_of_DRAM( <<
150 memory_end = memblock_end_of_DRAM(); <<
151 <<
152 setup_initial_init_mm(_stext, _etext, <<
153 init_task.thread.kregs = &fake_regs; <<
154 <<
155 /* Keep a copy of command line */ <<
156 *cmdline_p = boot_command_line; <<
157 <<
158 find_limits(&min_low_pfn, &max_low_pfn <<
159 max_mapnr = max_low_pfn; <<
160 <<
161 memblock_reserve(__pa_symbol(_stext), <<
162 #ifdef CONFIG_BLK_DEV_INITRD <<
163 if (initrd_start) { <<
164 memblock_reserve(virt_to_phys( <<
165 initrd_end - i <<
166 } <<
167 #endif /* CONFIG_BLK_DEV_INITRD */ <<
168 <<
169 early_init_fdt_reserve_self(); <<
170 early_init_fdt_scan_reserved_mem(); <<
171 <<
172 unflatten_and_copy_device_tree(); <<
173 <<
174 setup_cpuinfo(); <<
175 <<
176 copy_exception_handler(cpuinfo.excepti <<
177 <<
178 mmu_init(); <<
179 <<
180 copy_fast_tlb_miss_handler(cpuinfo.fas <<
181 <<
182 /* <<
183 * Initialize MMU context handling her <<
184 * needed for this. <<
185 */ <<
186 mmu_context_init(); <<
187 <<
188 /* <<
189 * get kmalloc into gear <<
190 */ <<
191 paging_init(); <<
192 } <<
193 12
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