patch-2.4.2 linux/arch/cris/kernel/setup.c

• Lines: 265
• Date: Thu Feb 8 16:32:44 2001
• Orig file: v2.4.1/linux/arch/cris/kernel/setup.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.1/linux/arch/cris/kernel/setup.c linux/arch/cris/kernel/setup.c
@@ -0,0 +1,264 @@
+/* $Id: setup.c,v 1.8 2001/01/16 16:31:38 bjornw Exp $
+ *
+ *  linux/arch/cris/kernel/setup.c
+ *
+ *  Copyright (C) 1995  Linus Torvalds
+ *  Copyright (c) 2000  Axis Communications AB
+ */
+
+/*
+ * This file handles the architecture-dependent parts of initialization
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/malloc.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+#include <linux/tty.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+
+#include <asm/segment.h>
+#include <asm/system.h>
+#include <asm/smp.h>
+#include <asm/types.h>
+#include <asm/svinto.h>
+
+/*
+ * Setup options
+ */
+struct drive_info_struct { char dummy[32]; } drive_info;
+struct screen_info screen_info;
+
+unsigned char aux_device_present;
+
+#ifdef CONFIG_BLK_DEV_RAM
+extern int rd_doload;		/* 1 = load ramdisk, 0 = don't load */
+extern int rd_prompt;		/* 1 = prompt for ramdisk, 0 = don't prompt */
+extern int rd_image_start;	/* starting block # of image */
+#endif
+
+extern int root_mountflags;
+extern char _etext, _edata, _end;
+
+#define COMMAND_LINE_SIZE 256
+
+static char command_line[COMMAND_LINE_SIZE] = { 0, };
+       char saved_command_line[COMMAND_LINE_SIZE];
+
+extern const unsigned long text_start, edata; /* set by the linker script */
+
+extern unsigned long romfs_start, romfs_length, romfs_in_flash; /* from head.S */
+
+/* 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 c00a0000 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)
+{
+        unsigned long bootmap_size;
+	unsigned long start_pfn, max_pfn;
+	unsigned long memory_start;
+	extern void console_print_etrax(const char *b);
+
+#if (defined(CONFIG_CHR_DEV_FLASH) || defined(CONFIG_BLK_DEV_FLASH))
+	/* TODO: move this into flash_init I think */
+	flash_probe();
+#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 %d 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 dont use a command line yet, so just let it be an empty string */
+
+	*cmdline_p = command_line;
+	strcpy(command_line, "root=/dev/rom"); /* use the appended romdisk as root */
+
+	/* give credit for the CRIS port */
+
+	printk("Linux/CRIS port on ETRAX 100LX (c) 2000 Axis Communications AB\n");
+
+}
+
+#ifdef CONFIG_PROC_FS
+#define HAS_FPU		0x0001
+#define HAS_MMU		0x0002
+#define HAS_ETHERNET100	0x0004
+#define HAS_TOKENRING	0x0008
+#define HAS_SCSI	0x0010
+#define HAS_ATA		0x0020
+#define HAS_USB		0x0040
+#define HAS_IRQ_BUG	0x0080
+
+static struct cpu_info {
+	char *model;
+	unsigned short cache;
+	unsigned short flags;
+} cpu_info[] = {
+	{ "ETRAX 1",   0, 0 },
+	{ "ETRAX 2",   0, 0 },	/* Don't say it HAS_TOKENRING - there are
+				   lethal bugs in that chip that
+				   prevents T-R from ever working.
+				   Never go there, and never lead anyone
+				   into believing it can work.  BTW:
+				   Anyone working on a T-R network
+				   driver? :-) :-) :-) :-/ */
+	{ "ETRAX 3",   0, HAS_TOKENRING },
+	{ "ETRAX 4",   0, HAS_TOKENRING | HAS_SCSI },
+	{ "Unknown",   0, 0 },
+	{ "Unknown",   0, 0 },
+	{ "Unknown",   0, 0 },
+	{ "Simulator",     8, HAS_ETHERNET100 | HAS_SCSI | HAS_ATA },
+	{ "ETRAX 100",     8, HAS_ETHERNET100 | HAS_SCSI | HAS_ATA | HAS_IRQ_BUG },
+	{ "ETRAX 100",     8, HAS_ETHERNET100 | HAS_SCSI | HAS_ATA },
+	{ "ETRAX 100LX",  8, HAS_ETHERNET100 | HAS_SCSI | HAS_ATA | HAS_USB | HAS_MMU },
+	{ "Unknown",   0, 0 },
+};
+
+/*
+ * BUFFER is PAGE_SIZE bytes long.
+ */
+int get_cpuinfo(char *buffer)
+{
+	int revision;
+#ifndef CONFIG_SVINTO_SIM
+	unsigned char tmp;
+
+	__asm__ volatile ("move vr,%0" : "=rm" (tmp));
+	revision = tmp;
+#else
+        /* Fake a revision for the simulator */
+	revision = 7;
+#endif
+
+	return sprintf(buffer,
+		       "cpu\t\t: CRIS\n"
+		       "cpu revision\t: %d\n"
+		       "cpu model\t: %s\n"
+		       "cache size\t: %d kB\n"
+		       "fpu\t\t: %s\n"
+		       "mmu\t\t: %s\n"
+		       "ethernet\t: %s Mbps\n"
+		       "token ring\t: %s\n"
+		       "scsi\t\t: %s\n"
+		       "ata\t\t: %s\n"
+		       "usb\t\t: %s\n"
+		       "bogomips\t: %lu.%02lu\n",
+
+		       revision,
+		       cpu_info[revision].model,
+		       cpu_info[revision].cache,
+		       cpu_info[revision].flags & HAS_FPU ? "yes" : "no",
+		       cpu_info[revision].flags & HAS_MMU ? "yes" : "no",
+		       cpu_info[revision].flags & HAS_ETHERNET100 ? "10/100" : "10",
+		       cpu_info[revision].flags & HAS_TOKENRING ? "4/16 Mbps" : "no",
+		       cpu_info[revision].flags & HAS_SCSI ? "yes" : "no",
+		       cpu_info[revision].flags & HAS_ATA ? "yes" : "no",
+		       cpu_info[revision].flags & HAS_USB ? "yes" : "no",
+		       (loops_per_jiffy * HZ + 500) / 100000,
+		       ((loops_per_jiffy * HZ + 500) / 1000) % 100);
+}
+#endif /* CONFIG_PROC_FS */