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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209/* * 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 <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};
/* 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());}
static void __init adjust_lowmem_bounds(void){ phys_addr_t block_start, block_end; u64 i; phys_addr_t memblock_limit = 0;
for_each_mem_range(i, &block_start, &block_end) { if (block_end > memblock_limit) memblock_limit = block_end; }
memblock_set_current_limit(memblock_limit);}
void __init setup_arch(char **cmdline_p){ console_verbose();
memory_start = memblock_start_of_DRAM(); memory_end = memblock_end_of_DRAM();
pr_debug("%s: start=%lx, end=%lx\n", __func__, memory_start, memory_end);
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;
adjust_lowmem_bounds(); find_limits(&min_low_pfn, &max_low_pfn, &max_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();}