Initial import

1 files changed, 221 insertions, 0 deletions

diff --git a/arch/cris/kernel/setup.c b/arch/cris/kernel/setup.c
new file mode 100644
index 000000000..bb12aa932
--- /dev/null
+++ b/arch/cris/kernel/setup.c
@@ -0,0 +1,221 @@
+/*
+ *
+ *  linux/arch/cris/kernel/setup.c
+ *
+ *  Copyright (C) 1995  Linus Torvalds
+ *  Copyright (c) 2001  Axis Communications AB
+ */
+
+/*
+ * This file handles the architecture-dependent parts of initialization
+ */
+
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <asm/pgtable.h>
+#include <linux/seq_file.h>
+#include <linux/screen_info.h>
+#include <linux/utsname.h>
+#include <linux/pfn.h>
+#include <linux/cpu.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
+#include <asm/setup.h>
+#include <arch/system.h>
+
+/*
+ * Setup options
+ */
+struct screen_info screen_info;
+
+extern int root_mountflags;
+extern char _etext, _edata, _end;
+
+char __initdata cris_command_line[COMMAND_LINE_SIZE] = { 0, };
+
+extern const unsigned long text_start, edata; /* set by the linker script */
+extern unsigned long dram_start, dram_end;
+
+extern unsigned long romfs_start, romfs_length, romfs_in_flash; /* from head.S */
+
+static struct cpu cpu_devices[NR_CPUS];
+
+extern void show_etrax_copyright(void);		/* arch-vX/kernel/setup.c */
+
+/* This mainly sets up the memory area, and can be really confusing.
+ *
+ * The physical DRAM is virtually mapped into dram_start to dram_end
+ * (usually c0000000 to c0000000 + DRAM size). The physical address is
+ * given by the macro __pa().
+ *
+ * In this DRAM, the kernel code and data is loaded, in the beginning.
+ * It really starts at c0004000 to make room for some special pages -
+ * the start address is text_start. The kernel data ends at _end. After
+ * this the ROM filesystem is appended (if there is any).
+ *
+ * Between this address and dram_end, we have RAM pages usable to the
+ * boot code and the system.
+ *
+ */
+
+void __init setup_arch(char **cmdline_p)
+{
+	extern void init_etrax_debug(void);
+	unsigned long bootmap_size;
+	unsigned long start_pfn, max_pfn;
+	unsigned long memory_start;
+
+#ifdef CONFIG_OF
+	early_init_dt_scan(__dtb_start);
+#endif
+
+	/* register an initial console printing routine for printk's */
+
+	init_etrax_debug();
+
+	/* we should really poll for DRAM size! */
+
+	high_memory = &dram_end;
+
+	if(romfs_in_flash || !romfs_length) {
+		/* if we have the romfs in flash, or if there is no rom filesystem,
+		 * our free area starts directly after the BSS
+		 */
+		memory_start = (unsigned long) &_end;
+	} else {
+		/* otherwise the free area starts after the ROM filesystem */
+		printk("ROM fs in RAM, size %lu bytes\n", romfs_length);
+		memory_start = romfs_start + romfs_length;
+	}
+
+	/* process 1's initial memory region is the kernel code/data */
+
+	init_mm.start_code = (unsigned long) &text_start;
+	init_mm.end_code =   (unsigned long) &_etext;
+	init_mm.end_data =   (unsigned long) &_edata;
+	init_mm.brk =        (unsigned long) &_end;
+
+	/* min_low_pfn points to the start of DRAM, start_pfn points
+	 * to the first DRAM pages after the kernel, and max_low_pfn
+	 * to the end of DRAM.
+	 */
+
+        /*
+         * partially used pages are not usable - thus
+         * we are rounding upwards:
+         */
+
+        start_pfn = PFN_UP(memory_start);  /* usually c0000000 + kernel + romfs */
+	max_pfn =   PFN_DOWN((unsigned long)high_memory); /* usually c0000000 + dram size */
+
+        /*
+         * Initialize the boot-time allocator (start, end)
+	 *
+	 * We give it access to all our DRAM, but we could as well just have
+	 * given it a small slice. No point in doing that though, unless we
+	 * have non-contiguous memory and want the boot-stuff to be in, say,
+	 * the smallest area.
+	 *
+	 * It will put a bitmap of the allocated pages in the beginning
+	 * of the range we give it, but it won't mark the bitmaps pages
+	 * as reserved. We have to do that ourselves below.
+	 *
+	 * We need to use init_bootmem_node instead of init_bootmem
+	 * because our map starts at a quite high address (min_low_pfn).
+         */
+
+	max_low_pfn = max_pfn;
+	min_low_pfn = PAGE_OFFSET >> PAGE_SHIFT;
+
+	bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
+					 min_low_pfn,
+					 max_low_pfn);
+
+	/* And free all memory not belonging to the kernel (addr, size) */
+
+	free_bootmem(PFN_PHYS(start_pfn), PFN_PHYS(max_pfn - start_pfn));
+
+        /*
+         * Reserve the bootmem bitmap itself as well. We do this in two
+         * steps (first step was init_bootmem()) because this catches
+         * the (very unlikely) case of us accidentally initializing the
+         * bootmem allocator with an invalid RAM area.
+	 *
+	 * Arguments are start, size
+         */
+
+	reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size, BOOTMEM_DEFAULT);
+
+	unflatten_and_copy_device_tree();
+
+	/* paging_init() sets up the MMU and marks all pages as reserved */
+
+	paging_init();
+
+	*cmdline_p = cris_command_line;
+
+#ifdef CONFIG_ETRAX_CMDLINE
+        if (!strcmp(cris_command_line, "")) {
+		strlcpy(cris_command_line, CONFIG_ETRAX_CMDLINE, COMMAND_LINE_SIZE);
+		cris_command_line[COMMAND_LINE_SIZE - 1] = '\0';
+	}
+#endif
+
+	/* Save command line for future references. */
+	memcpy(boot_command_line, cris_command_line, COMMAND_LINE_SIZE);
+	boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
+
+	/* give credit for the CRIS port */
+	show_etrax_copyright();
+
+	/* Setup utsname */
+	strcpy(init_utsname()->machine, cris_machine_name);
+}
+
+#ifdef CONFIG_PROC_FS
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+	return *pos < nr_cpu_ids ? (void *)(int)(*pos + 1) : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+	++*pos;
+	return c_start(m, pos);
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+extern int show_cpuinfo(struct seq_file *m, void *v);
+
+const struct seq_operations cpuinfo_op = {
+	.start = c_start,
+	.next  = c_next,
+	.stop  = c_stop,
+	.show  = show_cpuinfo,
+};
+#endif /* CONFIG_PROC_FS */
+
+static int __init topology_init(void)
+{
+	int i;
+
+	for_each_possible_cpu(i) {
+		 return register_cpu(&cpu_devices[i], i);
+	}
+
+	return 0;
+}
+
+subsys_initcall(topology_init);
+
+static int __init cris_of_init(void)
+{
+	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+	return 0;
+}
+core_initcall(cris_of_init);