2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2007-2009 PetaLogix
4 * Copyright (C) 2006 Atmark Techno, Inc.
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
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>
19 #include <asm/setup.h>
20 #include <asm/sections.h>
23 #include <linux/bug.h>
24 #include <linux/param.h>
25 #include <linux/cache.h>
26 #include <asm/cacheflush.h>
27 #include <asm/entry.h>
28 #include <asm/cpuinfo.h>
30 #include <asm/system.h>
32 #include <asm/pgtable.h>
34 DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */
35 DEFINE_PER_CPU(unsigned int, KM); /* Kernel/user mode */
36 DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
37 DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
38 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */
40 unsigned int boot_cpuid;
41 char cmd_line[COMMAND_LINE_SIZE];
43 void __init setup_arch(char **cmdline_p)
45 *cmdline_p = cmd_line;
49 unflatten_device_tree();
51 /* NOTE I think that this function is not necessary to call */
52 /* irq_early_init(); */
55 microblaze_cache_init();
64 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
65 printk(KERN_NOTICE "Self modified code enable\n");
69 #if defined(CONFIG_XILINX_CONSOLE)
70 conswitchp = &xil_con;
71 #elif defined(CONFIG_DUMMY_CONSOLE)
72 conswitchp = &dummy_con;
77 #ifdef CONFIG_MTD_UCLINUX
78 /* Handle both romfs and cramfs types, without generating unnecessary
79 code (ie no point checking for CRAMFS if it's not even enabled) */
80 inline unsigned get_romfs_len(unsigned *addr)
82 #ifdef CONFIG_ROMFS_FS
83 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
84 return be32_to_cpu(addr[2]);
88 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
89 return le32_to_cpu(addr[1]);
93 #endif /* CONFIG_MTD_UCLINUX_EBSS */
95 void __init machine_early_init(const char *cmdline, unsigned int ram,
96 unsigned int fdt, unsigned int msr)
98 unsigned long *src, *dst = (unsigned long *)0x0;
100 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
101 * end of kernel. There are two position which we want to check.
102 * The first is __init_end and the second __bss_start.
104 #ifdef CONFIG_MTD_UCLINUX
106 unsigned int romfs_base;
107 char *old_klimit = klimit;
109 romfs_base = (ram ? ram : (unsigned int)&__init_end);
110 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
112 romfs_base = (unsigned int)&__bss_start;
113 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
116 /* Move ROMFS out of BSS before clearing it */
117 if (romfs_size > 0) {
118 memmove(&_ebss, (int *)romfs_base, romfs_size);
119 klimit += romfs_size;
123 /* clearing bss section */
124 memset(__bss_start, 0, __bss_stop-__bss_start);
125 memset(_ssbss, 0, _esbss-_ssbss);
127 /* Copy command line passed from bootloader */
128 #ifndef CONFIG_CMDLINE_BOOL
129 if (cmdline && cmdline[0] != '\0')
130 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
135 /* initialize device tree for usage in early_printk */
136 early_init_devtree((void *)_fdt_start);
138 #ifdef CONFIG_EARLY_PRINTK
139 setup_early_printk(NULL);
142 early_printk("Ramdisk addr 0x%08x, ", ram);
144 early_printk("FDT at 0x%08x\n", fdt);
146 early_printk("Compiled-in FDT at 0x%08x\n",
147 (unsigned int)_fdt_start);
149 #ifdef CONFIG_MTD_UCLINUX
150 early_printk("Found romfs @ 0x%08x (0x%08x)\n",
151 romfs_base, romfs_size);
152 early_printk("#### klimit %p ####\n", old_klimit);
153 BUG_ON(romfs_size < 0); /* What else can we do? */
155 early_printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
156 romfs_size, romfs_base, (unsigned)&_ebss);
158 early_printk("New klimit: 0x%08x\n", (unsigned)klimit);
161 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
163 early_printk("!!!Your kernel has setup MSR instruction but "
164 "CPU don't have it %d\n", msr);
167 early_printk("!!!Your kernel not setup MSR instruction but "
168 "CPU have it %d\n", msr);
171 for (src = __ivt_start; src < __ivt_end; src++, dst++)
174 /* Initialize global data */
175 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */
176 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
179 #ifdef CONFIG_DEBUG_FS
180 struct dentry *of_debugfs_root;
182 static int microblaze_debugfs_init(void)
184 of_debugfs_root = debugfs_create_dir("microblaze", NULL);
186 return of_debugfs_root == NULL;
188 arch_initcall(microblaze_debugfs_init);