![Marek Vasut](/assets/img/avatar_default.png)
Fix the following compiler splat by adding __maybe_unused annotation to the variable. Using this particular annotation has the least ugly impact on the code compared to using ifdeffery. arch/nios2/kernel/setup.c: In function 'nios2_boot_init': arch/nios2/kernel/setup.c:107:7: warning: unused variable 'cmdline_passed' [-Wunused-variable] char cmdline_passed[COMMAND_LINE_SIZE] = { 0, }; ^ Signed-off-by: Marek Vasut <marex@denx.de> Acked-by: Ley Foon Tan <lftan@altera.com>
223 lines
5.3 KiB
C
223 lines
5.3 KiB
C
/*
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* Nios2-specific parts of system setup
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*
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* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
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* Copyright (C) 2004 Microtronix Datacom Ltd.
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* Copyright (C) 2001 Vic Phillips <vic@microtronix.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/console.h>
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#include <linux/bootmem.h>
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#include <linux/initrd.h>
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#include <linux/of_fdt.h>
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#include <asm/mmu_context.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/cpuinfo.h>
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unsigned long memory_start;
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EXPORT_SYMBOL(memory_start);
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unsigned long memory_end;
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EXPORT_SYMBOL(memory_end);
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unsigned long memory_size;
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static struct pt_regs fake_regs = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0,
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0};
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/* Copy a short hook instruction sequence to the exception address */
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static inline void copy_exception_handler(unsigned int addr)
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{
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unsigned int start = (unsigned int) exception_handler_hook;
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volatile unsigned int tmp = 0;
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if (start == addr) {
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/* The CPU exception address already points to the handler. */
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return;
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}
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__asm__ __volatile__ (
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"ldw %2,0(%0)\n"
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"stw %2,0(%1)\n"
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"ldw %2,4(%0)\n"
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"stw %2,4(%1)\n"
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"ldw %2,8(%0)\n"
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"stw %2,8(%1)\n"
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"flushd 0(%1)\n"
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"flushd 4(%1)\n"
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"flushd 8(%1)\n"
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"flushi %1\n"
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"addi %1,%1,4\n"
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"flushi %1\n"
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"addi %1,%1,4\n"
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"flushi %1\n"
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"flushp\n"
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: /* no output registers */
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: "r" (start), "r" (addr), "r" (tmp)
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: "memory"
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);
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}
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/* Copy the fast TLB miss handler */
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static inline void copy_fast_tlb_miss_handler(unsigned int addr)
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{
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unsigned int start = (unsigned int) fast_handler;
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unsigned int end = (unsigned int) fast_handler_end;
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volatile unsigned int tmp = 0;
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__asm__ __volatile__ (
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"1:\n"
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" ldw %3,0(%0)\n"
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" stw %3,0(%1)\n"
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" flushd 0(%1)\n"
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" flushi %1\n"
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" flushp\n"
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" addi %0,%0,4\n"
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" addi %1,%1,4\n"
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" bne %0,%2,1b\n"
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: /* no output registers */
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: "r" (start), "r" (addr), "r" (end), "r" (tmp)
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: "memory"
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);
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}
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/*
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* save args passed from u-boot, called from head.S
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*
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* @r4: NIOS magic
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* @r5: initrd start
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* @r6: initrd end or fdt
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* @r7: kernel command line
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*/
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asmlinkage void __init nios2_boot_init(unsigned r4, unsigned r5, unsigned r6,
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unsigned r7)
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{
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unsigned dtb_passed = 0;
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char cmdline_passed[COMMAND_LINE_SIZE] __maybe_unused = { 0, };
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#if defined(CONFIG_NIOS2_PASS_CMDLINE)
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if (r4 == 0x534f494e) { /* r4 is magic NIOS */
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#if defined(CONFIG_BLK_DEV_INITRD)
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if (r5) { /* initramfs */
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initrd_start = r5;
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initrd_end = r6;
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}
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#endif /* CONFIG_BLK_DEV_INITRD */
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dtb_passed = r6;
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if (r7)
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strncpy(cmdline_passed, (char *)r7, COMMAND_LINE_SIZE);
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}
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#endif
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early_init_devtree((void *)dtb_passed);
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#ifndef CONFIG_CMDLINE_FORCE
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if (cmdline_passed[0])
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strncpy(boot_command_line, cmdline_passed, COMMAND_LINE_SIZE);
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#ifdef CONFIG_NIOS2_CMDLINE_IGNORE_DTB
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else
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strncpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
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#endif
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#endif
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}
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void __init setup_arch(char **cmdline_p)
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{
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int bootmap_size;
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console_verbose();
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#ifdef CONFIG_EARLY_PRINTK
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setup_early_printk();
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#endif
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memory_start = PAGE_ALIGN((unsigned long)__pa(_end));
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memory_end = (unsigned long) CONFIG_NIOS2_MEM_BASE + memory_size;
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init_mm.start_code = (unsigned long) _stext;
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init_mm.end_code = (unsigned long) _etext;
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init_mm.end_data = (unsigned long) _edata;
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init_mm.brk = (unsigned long) _end;
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init_task.thread.kregs = &fake_regs;
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/* Keep a copy of command line */
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*cmdline_p = boot_command_line;
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min_low_pfn = PFN_UP(memory_start);
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max_low_pfn = PFN_DOWN(memory_end);
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max_mapnr = max_low_pfn;
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/*
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* give all the memory to the bootmap allocator, tell it to put the
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* boot mem_map at the start of memory
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*/
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pr_debug("init_bootmem_node(?,%#lx, %#x, %#lx)\n",
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min_low_pfn, PFN_DOWN(PHYS_OFFSET), max_low_pfn);
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bootmap_size = init_bootmem_node(NODE_DATA(0),
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min_low_pfn, PFN_DOWN(PHYS_OFFSET),
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max_low_pfn);
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/*
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* free the usable memory, we have to make sure we do not free
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* the bootmem bitmap so we then reserve it after freeing it :-)
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*/
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pr_debug("free_bootmem(%#lx, %#lx)\n",
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memory_start, memory_end - memory_start);
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free_bootmem(memory_start, memory_end - memory_start);
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/*
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* Reserve the bootmem bitmap itself as well. We do this in two
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* steps (first step was init_bootmem()) because this catches
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* the (very unlikely) case of us accidentally initializing the
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* bootmem allocator with an invalid RAM area.
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*
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* Arguments are start, size
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*/
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pr_debug("reserve_bootmem(%#lx, %#x)\n", memory_start, bootmap_size);
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reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);
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#ifdef CONFIG_BLK_DEV_INITRD
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if (initrd_start) {
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reserve_bootmem(virt_to_phys((void *)initrd_start),
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initrd_end - initrd_start, BOOTMEM_DEFAULT);
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}
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#endif /* CONFIG_BLK_DEV_INITRD */
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unflatten_and_copy_device_tree();
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setup_cpuinfo();
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copy_exception_handler(cpuinfo.exception_addr);
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mmu_init();
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copy_fast_tlb_miss_handler(cpuinfo.fast_tlb_miss_exc_addr);
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/*
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* Initialize MMU context handling here because data from cpuinfo is
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* needed for this.
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*/
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mmu_context_init();
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/*
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* get kmalloc into gear
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*/
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paging_init();
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#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
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conswitchp = &dummy_con;
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#endif
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}
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