1 files changed, 193 insertions, 0 deletions

diff --git a/arch/cris/kernel/setup.c b/arch/cris/kernel/setup.c
new file mode 100644
index 000000000000..6ec2671078bf
--- /dev/null
+++ b/arch/cris/kernel/setup.c
@@ -0,0 +1,193 @@
+/*
+ *
+ *  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/config.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <asm/pgtable.h>
+#include <linux/seq_file.h>
+#include <linux/tty.h>
+
+#include <asm/setup.h>
+
+/*
+ * Setup options
+ */
+struct drive_info_struct { char dummy[32]; } drive_info;
+struct screen_info screen_info;
+
+extern int root_mountflags;
+extern char _etext, _edata, _end;
+
+static char 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 */
+
+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;
+
+        /* 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;
+
+#define PFN_UP(x)       (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
+#define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
+#define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
+
+        /* 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);
+
+        /* paging_init() sets up the MMU and marks all pages as reserved */
+
+        paging_init();
+
+        /* We don't use a command line yet, so just re-initialize it without
+           saving anything that might be there.  */
+
+        *cmdline_p = command_line;
+
+#ifdef CONFIG_ETRAX_CMDLINE
+        strlcpy(command_line, CONFIG_ETRAX_CMDLINE, COMMAND_LINE_SIZE);
+        command_line[COMMAND_LINE_SIZE - 1] = '\0';
+
+        /* Save command line for future references. */
+        memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
+        saved_command_line[COMMAND_LINE_SIZE - 1] = '\0';
+#endif
+
+        /* give credit for the CRIS port */
+        show_etrax_copyright();
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+        /* We only got one CPU... */
+        return *pos < 1 ? (void *)1 : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        ++*pos;
+        return NULL;
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+extern int show_cpuinfo(struct seq_file *m, void *v);
+
+struct seq_operations cpuinfo_op = {
+        .start = c_start,
+        .next  = c_next,
+        .stop  = c_stop,
+        .show  = show_cpuinfo,
+};
+
+