/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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); */ printk("Ramdisk addr 0x%08x, ", ram); if (fdt) printk("FDT at 0x%08x\n", fdt); else printk("Compiled-in FDT at 0x%08x\n", (unsigned int)_fdt_start); #ifdef CONFIG_MTD_UCLINUX printk("Found romfs @ 0x%08x (0x%08x)\n", romfs_base, romfs_size); printk("#### klimit %p ####\n", old_klimit); BUG_ON(romfs_size < 0); /* What else can we do? */ printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", romfs_size, romfs_base, (unsigned)&__bss_stop); printk("New klimit: 0x%08x\n", (unsigned)klimit); #endif #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR if (msr) printk("!!!Your kernel has setup MSR instruction but " "CPU don't have it %x\n", msr); #else if (!msr) printk("!!!Your kernel not setup MSR instruction but " "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);