255 строки
6.2 KiB
C
255 строки
6.2 KiB
C
/*
|
|
* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
|
|
* 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/string.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/initrd.h>
|
|
#include <linux/console.h>
|
|
#include <linux/debugfs.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_platform.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/entry.h>
|
|
#include <asm/cpuinfo.h>
|
|
|
|
#include <asm/prom.h>
|
|
#include <asm/pgtable.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 */
|
|
|
|
unsigned int boot_cpuid;
|
|
/*
|
|
* 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] __attribute__ ((section(".data")));
|
|
|
|
void __init setup_arch(char **cmdline_p)
|
|
{
|
|
*cmdline_p = cmd_line;
|
|
|
|
console_verbose();
|
|
|
|
unflatten_device_tree();
|
|
|
|
setup_cpuinfo();
|
|
|
|
microblaze_cache_init();
|
|
|
|
setup_memory();
|
|
|
|
#ifdef CONFIG_EARLY_PRINTK
|
|
/* remap early console to virtual address */
|
|
remap_early_printk();
|
|
#endif
|
|
|
|
xilinx_pci_init();
|
|
|
|
#if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
|
|
pr_notice("Self modified code enable\n");
|
|
#endif
|
|
|
|
#ifdef CONFIG_VT
|
|
#if defined(CONFIG_XILINX_CONSOLE)
|
|
conswitchp = &xil_con;
|
|
#elif defined(CONFIG_DUMMY_CONSOLE)
|
|
conswitchp = &dummy_con;
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_MTD_UCLINUX
|
|
/* 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)
|
|
{
|
|
#ifdef CONFIG_ROMFS_FS
|
|
if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
|
|
return be32_to_cpu(addr[2]);
|
|
#endif
|
|
|
|
#ifdef CONFIG_CRAMFS
|
|
if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
|
|
return le32_to_cpu(addr[1]);
|
|
#endif
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_MTD_UCLINUX_EBSS */
|
|
|
|
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.
|
|
*/
|
|
#ifdef CONFIG_MTD_UCLINUX
|
|
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;
|
|
}
|
|
#endif
|
|
|
|
/* clearing bss section */
|
|
memset(__bss_start, 0, __bss_stop-__bss_start);
|
|
memset(_ssbss, 0, _esbss-_ssbss);
|
|
|
|
lockdep_init();
|
|
|
|
/* initialize device tree for usage in early_printk */
|
|
early_init_devtree((void *)_fdt_start);
|
|
|
|
#ifdef CONFIG_EARLY_PRINTK
|
|
setup_early_printk(NULL);
|
|
#endif
|
|
|
|
/* 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);
|
|
else
|
|
pr_info("Compiled-in FDT at 0x%08x\n",
|
|
(unsigned int)_fdt_start);
|
|
|
|
#ifdef CONFIG_MTD_UCLINUX
|
|
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);
|
|
#endif
|
|
|
|
#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
|
|
if (msr) {
|
|
pr_info("!!!Your kernel has setup MSR instruction but ");
|
|
pr_cont("CPU don't have it %x\n", msr);
|
|
}
|
|
#else
|
|
if (!msr) {
|
|
pr_info("!!!Your kernel not setup MSR instruction but ");
|
|
pr_cont"CPU have it %x\n", msr);
|
|
}
|
|
#endif
|
|
|
|
/* 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 */
|
|
#if !CONFIG_MANUAL_RESET_VECTOR
|
|
offset = 0x2;
|
|
#endif
|
|
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;
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
struct dentry *of_debugfs_root;
|
|
|
|
static int microblaze_debugfs_init(void)
|
|
{
|
|
of_debugfs_root = debugfs_create_dir("microblaze", NULL);
|
|
|
|
return of_debugfs_root == NULL;
|
|
}
|
|
arch_initcall(microblaze_debugfs_init);
|
|
|
|
# ifdef CONFIG_MMU
|
|
static int __init debugfs_tlb(void)
|
|
{
|
|
struct dentry *d;
|
|
|
|
if (!of_debugfs_root)
|
|
return -ENODEV;
|
|
|
|
d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
|
|
if (!d)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
device_initcall(debugfs_tlb);
|
|
# endif
|
|
#endif
|
|
|
|
static int dflt_bus_notify(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct device *dev = data;
|
|
|
|
/* We are only intereted in device addition */
|
|
if (action != BUS_NOTIFY_ADD_DEVICE)
|
|
return 0;
|
|
|
|
set_dma_ops(dev, &dma_direct_ops);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block dflt_plat_bus_notifier = {
|
|
.notifier_call = dflt_bus_notify,
|
|
.priority = INT_MAX,
|
|
};
|
|
|
|
static int __init setup_bus_notifier(void)
|
|
{
|
|
bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
|
|
|
|
return 0;
|
|
}
|
|
|
|
arch_initcall(setup_bus_notifier);
|