Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 | /* * Nios2-specific parts of system setup * * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> * Copyright (C) 2004 Microtronix Datacom Ltd. * Copyright (C) 2001 Vic Phillips <vic@microtronix.com> * * 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/export.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/sched.h> #include <linux/sched/task.h> #include <linux/console.h> #include <linux/memblock.h> #include <linux/initrd.h> #include <linux/of_fdt.h> #include <linux/screen_info.h> #include <asm/mmu_context.h> #include <asm/sections.h> #include <asm/setup.h> #include <asm/cpuinfo.h> unsigned long memory_start; EXPORT_SYMBOL(memory_start); unsigned long memory_end; EXPORT_SYMBOL(memory_end); static struct pt_regs fake_regs = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; #ifdef CONFIG_VT struct screen_info screen_info; #endif /* Copy a short hook instruction sequence to the exception address */ static inline void copy_exception_handler(unsigned int addr) { unsigned int start = (unsigned int) exception_handler_hook; volatile unsigned int tmp = 0; if (start == addr) { /* The CPU exception address already points to the handler. */ return; } __asm__ __volatile__ ( "ldw %2,0(%0)\n" "stw %2,0(%1)\n" "ldw %2,4(%0)\n" "stw %2,4(%1)\n" "ldw %2,8(%0)\n" "stw %2,8(%1)\n" "flushd 0(%1)\n" "flushd 4(%1)\n" "flushd 8(%1)\n" "flushi %1\n" "addi %1,%1,4\n" "flushi %1\n" "addi %1,%1,4\n" "flushi %1\n" "flushp\n" : /* no output registers */ : "r" (start), "r" (addr), "r" (tmp) : "memory" ); } /* Copy the fast TLB miss handler */ static inline void copy_fast_tlb_miss_handler(unsigned int addr) { unsigned int start = (unsigned int) fast_handler; unsigned int end = (unsigned int) fast_handler_end; volatile unsigned int tmp = 0; __asm__ __volatile__ ( "1:\n" " ldw %3,0(%0)\n" " stw %3,0(%1)\n" " flushd 0(%1)\n" " flushi %1\n" " flushp\n" " addi %0,%0,4\n" " addi %1,%1,4\n" " bne %0,%2,1b\n" : /* no output registers */ : "r" (start), "r" (addr), "r" (end), "r" (tmp) : "memory" ); } /* * save args passed from u-boot, called from head.S * * @r4: NIOS magic * @r5: initrd start * @r6: initrd end or fdt * @r7: kernel command line */ asmlinkage void __init nios2_boot_init(unsigned r4, unsigned r5, unsigned r6, unsigned r7) { unsigned dtb_passed = 0; char cmdline_passed[COMMAND_LINE_SIZE] __maybe_unused = { 0, }; #if defined(CONFIG_NIOS2_PASS_CMDLINE) if (r4 == 0x534f494e) { /* r4 is magic NIOS */ #if defined(CONFIG_BLK_DEV_INITRD) if (r5) { /* initramfs */ initrd_start = r5; initrd_end = r6; } #endif /* CONFIG_BLK_DEV_INITRD */ dtb_passed = r6; if (r7) strscpy(cmdline_passed, (char *)r7, COMMAND_LINE_SIZE); } #endif early_init_devtree((void *)dtb_passed); #ifndef CONFIG_CMDLINE_FORCE if (cmdline_passed[0]) strscpy(boot_command_line, cmdline_passed, COMMAND_LINE_SIZE); #ifdef CONFIG_NIOS2_CMDLINE_IGNORE_DTB else strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); #endif #endif parse_early_param(); } static void __init find_limits(unsigned long *min, unsigned long *max_low, unsigned long *max_high) { *max_low = PFN_DOWN(memblock_get_current_limit()); *min = PFN_UP(memblock_start_of_DRAM()); *max_high = PFN_DOWN(memblock_end_of_DRAM()); } void __init setup_arch(char **cmdline_p) { console_verbose(); memory_start = memblock_start_of_DRAM(); memory_end = memblock_end_of_DRAM(); setup_initial_init_mm(_stext, _etext, _edata, _end); init_task.thread.kregs = &fake_regs; /* Keep a copy of command line */ *cmdline_p = boot_command_line; find_limits(&min_low_pfn, &max_low_pfn, &max_pfn); max_mapnr = max_low_pfn; memblock_reserve(__pa_symbol(_stext), _end - _stext); #ifdef CONFIG_BLK_DEV_INITRD if (initrd_start) { memblock_reserve(virt_to_phys((void *)initrd_start), initrd_end - initrd_start); } #endif /* CONFIG_BLK_DEV_INITRD */ early_init_fdt_reserve_self(); early_init_fdt_scan_reserved_mem(); unflatten_and_copy_device_tree(); setup_cpuinfo(); copy_exception_handler(cpuinfo.exception_addr); mmu_init(); copy_fast_tlb_miss_handler(cpuinfo.fast_tlb_miss_exc_addr); /* * Initialize MMU context handling here because data from cpuinfo is * needed for this. */ mmu_context_init(); /* * get kmalloc into gear */ paging_init(); } |