blob: f417333eccaedfe176479b7a2eb97beb703c38ba [file] [log] [blame]
* Copyright (C) 2007-2009 Michal Simek <>
* Copyright (C) 2007-2009 PetaLogix
* Copyright (C) 2006 Atmark Techno, Inc.
* 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.
#include <linux/init.h>
#include <linux/of_clk.h>
#include <linux/clocksource.h>
#include <linux/string.h>
#include <linux/seq_file.h>
#include <linux/cpu.h>
#include <linux/initrd.h>
#include <linux/console.h>
#include <linux/debugfs.h>
#include <linux/of_fdt.h>
#include <linux/pgtable.h>
#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/page.h>
#include <linux/io.h>
#include <linux/bug.h>
#include <linux/param.h>
#include <linux/pci.h>
#include <linux/cache.h>
#include <linux/of.h>
#include <linux/dma-mapping.h>
#include <asm/cacheflush.h>
#include <asm/entry.h>
#include <asm/cpuinfo.h>
DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */
DEFINE_PER_CPU(unsigned int, KM); /* Kernel/user mode */
DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */
* Placed cmd_line to .data section because can be initialized from
* ASM code. Default position is BSS section which is cleared
* in machine_early_init().
char cmd_line[COMMAND_LINE_SIZE] __section(".data");
void __init setup_arch(char **cmdline_p)
*cmdline_p = boot_command_line;
/* Handle both romfs and cramfs types, without generating unnecessary
code (ie no point checking for CRAMFS if it's not even enabled) */
inline unsigned get_romfs_len(unsigned *addr)
if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
return be32_to_cpu(addr[2]);
if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
return le32_to_cpu(addr[1]);
return 0;
unsigned long kernel_tlb;
void __init machine_early_init(const char *cmdline, unsigned int ram,
unsigned int fdt, unsigned int msr, unsigned int tlb0,
unsigned int tlb1)
unsigned long *src, *dst;
unsigned int offset = 0;
/* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
* end of kernel. There are two position which we want to check.
* The first is __init_end and the second __bss_start.
int romfs_size;
unsigned int romfs_base;
char *old_klimit = klimit;
romfs_base = (ram ? ram : (unsigned int)&__init_end);
romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
if (!romfs_size) {
romfs_base = (unsigned int)&__bss_start;
romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
/* Move ROMFS out of BSS before clearing it */
if (romfs_size > 0) {
memmove(&__bss_stop, (int *)romfs_base, romfs_size);
klimit += romfs_size;
/* clearing bss section */
memset(__bss_start, 0, __bss_stop-__bss_start);
memset(_ssbss, 0, _esbss-_ssbss);
/* initialize device tree for usage in early_printk */
/* setup kernel_tlb after BSS cleaning
* Maybe worth to move to asm code */
kernel_tlb = tlb0 + tlb1;
/* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
tlb1, kernel_tlb); */
pr_info("Ramdisk addr 0x%08x, ", ram);
if (fdt)
pr_info("FDT at 0x%08x\n", fdt);
pr_info("Compiled-in FDT at %p\n", _fdt_start);
pr_info("Found romfs @ 0x%08x (0x%08x)\n",
romfs_base, romfs_size);
pr_info("#### klimit %p ####\n", old_klimit);
BUG_ON(romfs_size < 0); /* What else can we do? */
pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
romfs_size, romfs_base, (unsigned)&__bss_stop);
pr_info("New klimit: 0x%08x\n", (unsigned)klimit);
if (msr) {
pr_info("!!!Your kernel has setup MSR instruction but ");
pr_cont("CPU don't have it %x\n", msr);
if (!msr) {
pr_info("!!!Your kernel not setup MSR instruction but ");
pr_cont("CPU have it %x\n", msr);
/* Do not copy reset vectors. offset = 0x2 means skip the first
* two instructions. dst is pointer to MB vectors which are placed
* in block ram. If you want to copy reset vector setup offset to 0x0 */
offset = 0x2;
dst = (unsigned long *) (offset * sizeof(u32));
for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
*dst = *src;
/* Initialize global data */
per_cpu(KM, 0) = 0x1; /* We start in kernel mode */
per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
void __init time_init(void)
struct dentry *of_debugfs_root;
static int microblaze_debugfs_init(void)
of_debugfs_root = debugfs_create_dir("microblaze", NULL);
return 0;
static int __init debugfs_tlb(void)
debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
return 0;