1 files changed, 286 insertions, 0 deletions
diff --git a/arch/v850/kernel/setup.c b/arch/v850/kernel/setup.c
new file mode 100644
index 000000000000..c41d72b01b88
--- /dev/null
+++ b/arch/v850/kernel/setup.c
@@ -0,0 +1,286 @@
+/*
+ * arch/v850/kernel/setup.c -- Arch-dependent initialization functions
+ *
+ *  Copyright (C) 2001,02,03  NEC Electronics Corporation
+ *  Copyright (C) 2001,02,03  Miles Bader <miles@gnu.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License.  See the file COPYING in the main directory of this
+ * archive for more details.
+ *
+ * Written by Miles Bader <miles@gnu.org>
+ */
+
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/swap.h>		/* we don't have swap, but for nr_free_pages */
+#include <linux/irq.h>
+#include <linux/reboot.h>
+#include <linux/personality.h>
+#include <linux/major.h>
+#include <linux/root_dev.h>
+#include <linux/mtd/mtd.h>
+#include <linux/init.h>
+
+#include <asm/irq.h>
+#include <asm/setup.h>
+
+#include "mach.h"
+
+/* These symbols are all defined in the linker map to delineate various
+   statically allocated regions of memory.  */
+
+extern char _intv_start, _intv_end;
+/* `kram' is only used if the kernel uses part of normal user RAM.  */
+extern char _kram_start __attribute__ ((__weak__));
+extern char _kram_end __attribute__ ((__weak__));
+extern char _init_start, _init_end;
+extern char _bootmap;
+extern char _stext, _etext, _sdata, _edata, _sbss, _ebss;
+/* Many platforms use an embedded root image.  */
+extern char _root_fs_image_start __attribute__ ((__weak__));
+extern char _root_fs_image_end __attribute__ ((__weak__));
+
+
+char command_line[COMMAND_LINE_SIZE];
+
+/* Memory not used by the kernel.  */
+static unsigned long total_ram_pages;
+
+/* System RAM.  */
+static unsigned long ram_start = 0, ram_len = 0;
+
+
+#define ADDR_TO_PAGE_UP(x)   ((((unsigned long)x) + PAGE_SIZE-1) >> PAGE_SHIFT)
+#define ADDR_TO_PAGE(x)	     (((unsigned long)x) >> PAGE_SHIFT)
+#define PAGE_TO_ADDR(x)	     (((unsigned long)x) << PAGE_SHIFT)
+
+static void init_mem_alloc (unsigned long ram_start, unsigned long ram_len);
+
+void set_mem_root (void *addr, size_t len, char *cmd_line);
+
+
+void __init setup_arch (char **cmdline)
+{
+	/* Keep a copy of command line */
+	*cmdline = command_line;
+	memcpy (saved_command_line, command_line, COMMAND_LINE_SIZE);
+	saved_command_line[COMMAND_LINE_SIZE - 1] = '\0';
+
+	console_verbose ();
+
+	init_mm.start_code = (unsigned long) &_stext;
+	init_mm.end_code = (unsigned long) &_etext;
+	init_mm.end_data = (unsigned long) &_edata;
+	init_mm.brk = (unsigned long) &_kram_end;
+
+	/* Find out what mem this machine has.  */
+	mach_get_physical_ram (&ram_start, &ram_len);
+	/* ... and tell the kernel about it.  */
+	init_mem_alloc (ram_start, ram_len);
+
+	printk (KERN_INFO "CPU: %s\nPlatform: %s\n",
+		CPU_MODEL_LONG, PLATFORM_LONG);
+
+	/* do machine-specific setups.  */
+	mach_setup (cmdline);
+
+#ifdef CONFIG_MTD
+	if (!ROOT_DEV && &_root_fs_image_end > &_root_fs_image_start)
+		set_mem_root (&_root_fs_image_start,
+			      &_root_fs_image_end - &_root_fs_image_start,
+			      *cmdline);
+#endif
+}
+
+void __init trap_init (void)
+{
+}
+
+#ifdef CONFIG_MTD
+/* Set the root filesystem to be the given memory region.
+   Some parameter may be appended to CMD_LINE.  */
+void set_mem_root (void *addr, size_t len, char *cmd_line)
+{
+	/* The only way to pass info to the MTD slram driver is via
+	   the command line.  */
+	if (*cmd_line) {
+		cmd_line += strlen (cmd_line);
+		*cmd_line++ = ' ';
+	}
+	sprintf (cmd_line, "slram=root,0x%x,+0x%x", (u32)addr, (u32)len);
+
+	ROOT_DEV = MKDEV (MTD_BLOCK_MAJOR, 0);
+}
+#endif
+
+
+static void irq_nop (unsigned irq) { }
+static unsigned irq_zero (unsigned irq) { return 0; }
+
+static void nmi_end (unsigned irq)
+{
+	if (irq != IRQ_NMI (0)) {
+		printk (KERN_CRIT "NMI %d is unrecoverable; restarting...",
+			irq - IRQ_NMI (0));
+		machine_restart (0);
+	}
+}
+
+static struct hw_interrupt_type nmi_irq_type = {
+	"NMI",
+	irq_zero,		/* startup */
+	irq_nop,		/* shutdown */
+	irq_nop,		/* enable */
+	irq_nop,		/* disable */
+	irq_nop,		/* ack */
+	nmi_end,		/* end */
+};
+
+void __init init_IRQ (void)
+{
+	init_irq_handlers (0, NUM_MACH_IRQS, 1, 0);
+	init_irq_handlers (IRQ_NMI (0), NUM_NMIS, 1, &nmi_irq_type);
+	mach_init_irqs ();
+}
+
+
+void __init mem_init (void)
+{
+	max_mapnr = MAP_NR (ram_start + ram_len);
+
+	num_physpages = ADDR_TO_PAGE (ram_len);
+
+	total_ram_pages = free_all_bootmem ();
+
+	printk (KERN_INFO
+		"Memory: %luK/%luK available"
+		" (%luK kernel code, %luK data)\n",
+		PAGE_TO_ADDR (nr_free_pages()) / 1024,
+		ram_len / 1024,
+		((unsigned long)&_etext - (unsigned long)&_stext) / 1024,
+		((unsigned long)&_ebss - (unsigned long)&_sdata) / 1024);
+}
+
+void free_initmem (void)
+{
+	unsigned long ram_end = ram_start + ram_len;
+	unsigned long start = PAGE_ALIGN ((unsigned long)(&_init_start));
+
+	if (start >= ram_start && start < ram_end) {
+		unsigned long addr;
+		unsigned long end = PAGE_ALIGN ((unsigned long)(&_init_end));
+
+		if (end > ram_end)
+			end = ram_end;
+
+		printk("Freeing unused kernel memory: %ldK freed\n",
+		       (end - start) / 1024);
+
+		for (addr = start; addr < end; addr += PAGE_SIZE) {
+			struct page *page = virt_to_page (addr);
+			ClearPageReserved (page);
+			set_page_count (page, 1);
+			__free_page (page);
+			total_ram_pages++;
+		}
+	}
+}
+
+
+/* Initialize the `bootmem allocator'.  RAM_START and RAM_LEN identify
+   what RAM may be used.  */
+static void __init
+init_bootmem_alloc (unsigned long ram_start, unsigned long ram_len)
+{
+	/* The part of the kernel that's in the same managed RAM space
+	   used for general allocation.  */
+	unsigned long kram_start = (unsigned long)&_kram_start;
+	unsigned long kram_end = (unsigned long)&_kram_end;
+	/* End of the managed RAM space.  */
+	unsigned long ram_end = ram_start + ram_len;
+	/* Address range of the interrupt vector table.  */
+	unsigned long intv_start = (unsigned long)&_intv_start;
+	unsigned long intv_end = (unsigned long)&_intv_end;
+	/* True if the interrupt vectors are in the managed RAM area.  */
+	int intv_in_ram = (intv_end > ram_start && intv_start < ram_end);
+	/* True if the interrupt vectors are inside the kernel's RAM.  */
+	int intv_in_kram = (intv_end > kram_start && intv_start < kram_end);
+	/* A pointer to an optional function that reserves platform-specific
+	   memory regions.  We declare the pointer `volatile' to avoid gcc
+	   turning the call into a static call (the problem is that since
+	   it's a weak symbol, a static call may end up trying to reference
+	   the location 0x0, which is not always reachable).  */
+	void (*volatile mrb) (void) = mach_reserve_bootmem;
+	/* The bootmem allocator's allocation bitmap.  */
+	unsigned long bootmap = (unsigned long)&_bootmap;
+	unsigned long bootmap_len;
+
+	/* Round bootmap location up to next page.  */
+	bootmap = PAGE_TO_ADDR (ADDR_TO_PAGE_UP (bootmap));
+
+	/* Initialize bootmem allocator.  */
+	bootmap_len = init_bootmem_node (NODE_DATA (0),
+					 ADDR_TO_PAGE (bootmap),
+					 ADDR_TO_PAGE (PAGE_OFFSET),
+					 ADDR_TO_PAGE (ram_end));
+
+	/* Now make the RAM actually allocatable (it starts out `reserved'). */
+	free_bootmem (ram_start, ram_len);
+
+	if (kram_end > kram_start)
+		/* Reserve the RAM part of the kernel's address space, so it
+		   doesn't get allocated.  */
+		reserve_bootmem (kram_start, kram_end - kram_start);
+	
+	if (intv_in_ram && !intv_in_kram)
+		/* Reserve the interrupt vector space.  */
+		reserve_bootmem (intv_start, intv_end - intv_start);
+
+	if (bootmap >= ram_start && bootmap < ram_end)
+		/* Reserve the bootmap space.  */
+		reserve_bootmem (bootmap, bootmap_len);
+
+	/* Reserve the memory used by the root filesystem image if it's
+	   in RAM.  */
+	if (&_root_fs_image_end > &_root_fs_image_start
+	    && (unsigned long)&_root_fs_image_start >= ram_start
+	    && (unsigned long)&_root_fs_image_start < ram_end)
+		reserve_bootmem ((unsigned long)&_root_fs_image_start,
+				 &_root_fs_image_end - &_root_fs_image_start);
+
+	/* Let the platform-dependent code reserve some too.  */
+	if (mrb)
+		(*mrb) ();
+}
+
+/* Tell the kernel about what RAM it may use for memory allocation.  */
+static void __init
+init_mem_alloc (unsigned long ram_start, unsigned long ram_len)
+{
+	unsigned i;
+	unsigned long zones_size[MAX_NR_ZONES];
+
+	init_bootmem_alloc (ram_start, ram_len);
+
+	for (i = 0; i < MAX_NR_ZONES; i++)
+		zones_size[i] = 0;
+
+	/* We stuff all the memory into one area, which includes the
+	   initial gap from PAGE_OFFSET to ram_start.  */
+	zones_size[ZONE_DMA]
+		= ADDR_TO_PAGE (ram_len + (ram_start - PAGE_OFFSET));
+
+	/* The allocator is very picky about the address of the first
+	   allocatable page -- it must be at least as aligned as the
+	   maximum allocation -- so try to detect cases where it will get
+	   confused and signal them at compile time (this is a common
+	   problem when porting to a new platform with ).  There is a
+	   similar runtime check in free_area_init_core.  */
+#if ((PAGE_OFFSET >> PAGE_SHIFT) & ((1UL << (MAX_ORDER - 1)) - 1))
+#error MAX_ORDER is too large for given PAGE_OFFSET (use CONFIG_FORCE_MAX_ZONEORDER to change it)
+#endif
+	NODE_DATA(0)->node_mem_map = NULL;
+	free_area_init_node (0, NODE_DATA(0), zones_size,
+			     ADDR_TO_PAGE (PAGE_OFFSET), 0);
+}