tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2007-2009 PetaLogix
4 * Copyright (C) 2006 Atmark Techno, Inc.
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/init.h>
12#include <linux/string.h>
13#include <linux/seq_file.h>
14#include <linux/cpu.h>
15#include <linux/initrd.h>
16#include <linux/console.h>
17#include <linux/debugfs.h>
18
19#include <asm/setup.h>
20#include <asm/sections.h>
21#include <asm/page.h>
22#include <linux/io.h>
23#include <linux/bug.h>
24#include <linux/param.h>
25#include <linux/pci.h>
26#include <linux/cache.h>
27#include <linux/of_platform.h>
28#include <linux/dma-mapping.h>
29#include <asm/cacheflush.h>
30#include <asm/entry.h>
31#include <asm/cpuinfo.h>
32
33#include <asm/prom.h>
34#include <asm/pgtable.h>
35
36DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */
37DEFINE_PER_CPU(unsigned int, KM); /* Kernel/user mode */
38DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
39DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
40DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */
41
42unsigned int boot_cpuid;
43char cmd_line[COMMAND_LINE_SIZE];
44
45void __init setup_arch(char **cmdline_p)
46{
47 *cmdline_p = cmd_line;
48
49 console_verbose();
50
51 unflatten_device_tree();
52
53 setup_cpuinfo();
54
55 microblaze_cache_init();
56
57 setup_memory();
58
59#ifdef CONFIG_EARLY_PRINTK
60 /* remap early console to virtual address */
61 remap_early_printk();
62#endif
63
64 xilinx_pci_init();
65
66#if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
67 printk(KERN_NOTICE "Self modified code enable\n");
68#endif
69
70#ifdef CONFIG_VT
71#if defined(CONFIG_XILINX_CONSOLE)
72 conswitchp = &xil_con;
73#elif defined(CONFIG_DUMMY_CONSOLE)
74 conswitchp = &dummy_con;
75#endif
76#endif
77}
78
79#ifdef CONFIG_MTD_UCLINUX
80/* Handle both romfs and cramfs types, without generating unnecessary
81 code (ie no point checking for CRAMFS if it's not even enabled) */
82inline unsigned get_romfs_len(unsigned *addr)
83{
84#ifdef CONFIG_ROMFS_FS
85 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
86 return be32_to_cpu(addr[2]);
87#endif
88
89#ifdef CONFIG_CRAMFS
90 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
91 return le32_to_cpu(addr[1]);
92#endif
93 return 0;
94}
95#endif /* CONFIG_MTD_UCLINUX_EBSS */
96
97unsigned long kernel_tlb;
98
99void __init machine_early_init(const char *cmdline, unsigned int ram,
100 unsigned int fdt, unsigned int msr, unsigned int tlb0,
101 unsigned int tlb1)
102{
103 unsigned long *src, *dst;
104 unsigned int offset = 0;
105
106 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
107 * end of kernel. There are two position which we want to check.
108 * The first is __init_end and the second __bss_start.
109 */
110#ifdef CONFIG_MTD_UCLINUX
111 int romfs_size;
112 unsigned int romfs_base;
113 char *old_klimit = klimit;
114
115 romfs_base = (ram ? ram : (unsigned int)&__init_end);
116 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
117 if (!romfs_size) {
118 romfs_base = (unsigned int)&__bss_start;
119 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
120 }
121
122 /* Move ROMFS out of BSS before clearing it */
123 if (romfs_size > 0) {
124 memmove(&__bss_stop, (int *)romfs_base, romfs_size);
125 klimit += romfs_size;
126 }
127#endif
128
129/* clearing bss section */
130 memset(__bss_start, 0, __bss_stop-__bss_start);
131 memset(_ssbss, 0, _esbss-_ssbss);
132
133 /* Copy command line passed from bootloader */
134#ifndef CONFIG_CMDLINE_BOOL
135 if (cmdline && cmdline[0] != '\0')
136 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
137#endif
138
139 lockdep_init();
140
141/* initialize device tree for usage in early_printk */
142 early_init_devtree((void *)_fdt_start);
143
144#ifdef CONFIG_EARLY_PRINTK
145 setup_early_printk(NULL);
146#endif
147
148 /* setup kernel_tlb after BSS cleaning
149 * Maybe worth to move to asm code */
150 kernel_tlb = tlb0 + tlb1;
151 /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
152 tlb1, kernel_tlb); */
153
154 printk("Ramdisk addr 0x%08x, ", ram);
155 if (fdt)
156 printk("FDT at 0x%08x\n", fdt);
157 else
158 printk("Compiled-in FDT at 0x%08x\n",
159 (unsigned int)_fdt_start);
160
161#ifdef CONFIG_MTD_UCLINUX
162 printk("Found romfs @ 0x%08x (0x%08x)\n",
163 romfs_base, romfs_size);
164 printk("#### klimit %p ####\n", old_klimit);
165 BUG_ON(romfs_size < 0); /* What else can we do? */
166
167 printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
168 romfs_size, romfs_base, (unsigned)&__bss_stop);
169
170 printk("New klimit: 0x%08x\n", (unsigned)klimit);
171#endif
172
173#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
174 if (msr)
175 printk("!!!Your kernel has setup MSR instruction but "
176 "CPU don't have it %x\n", msr);
177#else
178 if (!msr)
179 printk("!!!Your kernel not setup MSR instruction but "
180 "CPU have it %x\n", msr);
181#endif
182
183 /* Do not copy reset vectors. offset = 0x2 means skip the first
184 * two instructions. dst is pointer to MB vectors which are placed
185 * in block ram. If you want to copy reset vector setup offset to 0x0 */
186#if !CONFIG_MANUAL_RESET_VECTOR
187 offset = 0x2;
188#endif
189 dst = (unsigned long *) (offset * sizeof(u32));
190 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
191 *dst = *src;
192
193 /* Initialize global data */
194 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */
195 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
196}
197
198#ifdef CONFIG_DEBUG_FS
199struct dentry *of_debugfs_root;
200
201static int microblaze_debugfs_init(void)
202{
203 of_debugfs_root = debugfs_create_dir("microblaze", NULL);
204
205 return of_debugfs_root == NULL;
206}
207arch_initcall(microblaze_debugfs_init);
208
209# ifdef CONFIG_MMU
210static int __init debugfs_tlb(void)
211{
212 struct dentry *d;
213
214 if (!of_debugfs_root)
215 return -ENODEV;
216
217 d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
218 if (!d)
219 return -ENOMEM;
220}
221device_initcall(debugfs_tlb);
222# endif
223#endif
224
225static int dflt_bus_notify(struct notifier_block *nb,
226 unsigned long action, void *data)
227{
228 struct device *dev = data;
229
230 /* We are only intereted in device addition */
231 if (action != BUS_NOTIFY_ADD_DEVICE)
232 return 0;
233
234 set_dma_ops(dev, &dma_direct_ops);
235
236 return NOTIFY_DONE;
237}
238
239static struct notifier_block dflt_plat_bus_notifier = {
240 .notifier_call = dflt_bus_notify,
241 .priority = INT_MAX,
242};
243
244static int __init setup_bus_notifier(void)
245{
246 bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
247
248 return 0;
249}
250
251arch_initcall(setup_bus_notifier);