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https://github.com/torvalds/linux
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497888cf69
All these are instances of #define NAME value; or #define NAME(params_opt) value; These of course fail to build when used in contexts like if(foo $OP NAME) while(bar $OP NAME) and may silently generate the wrong code in contexts such as foo = NAME + 1; /* foo = value; + 1; */ bar = NAME - 1; /* bar = value; - 1; */ baz = NAME & quux; /* baz = value; & quux; */ Reported on comp.lang.c, Message-ID: <ab0d55fe-25e5-482b-811e-c475aa6065c3@c29g2000yqd.googlegroups.com> Initial analysis of the dangers provided by Keith Thompson in that thread. There are many more instances of more complicated macros having unnecessary trailing semicolons, but this pile seems to be all of the cases of simple values suffering from the problem. (Thus things that are likely to be found in one of the contexts above, more complicated ones aren't.) Signed-off-by: Phil Carmody <ext-phil.2.carmody@nokia.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
245 lines
6.6 KiB
C
245 lines
6.6 KiB
C
/*
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* linux/arch/h8300/kernel/setup.c
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*
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* Copyleft ()) 2000 James D. Schettine {james@telos-systems.com}
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* Copyright (C) 1999,2000 Greg Ungerer (gerg@snapgear.com)
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* Copyright (C) 1998,1999 D. Jeff Dionne <jeff@lineo.ca>
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* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
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* Copyright (C) 1995 Hamish Macdonald
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* Copyright (C) 2000 Lineo Inc. (www.lineo.com)
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* Copyright (C) 2001 Lineo, Inc. <www.lineo.com>
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*
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* H8/300 porting Yoshinori Sato <ysato@users.sourceforge.jp>
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*/
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/*
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* This file handles the architecture-dependent parts of system setup
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/fb.h>
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#include <linux/console.h>
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#include <linux/genhd.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/major.h>
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#include <linux/bootmem.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <asm/setup.h>
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#include <asm/irq.h>
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#include <asm/pgtable.h>
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#if defined(__H8300H__)
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#define CPU "H8/300H"
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#include <asm/regs306x.h>
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#endif
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#if defined(__H8300S__)
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#define CPU "H8S"
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#include <asm/regs267x.h>
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#endif
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#define STUBSIZE 0xc000
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unsigned long rom_length;
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unsigned long memory_start;
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unsigned long memory_end;
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char __initdata command_line[COMMAND_LINE_SIZE];
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extern int _stext, _etext, _sdata, _edata, _sbss, _ebss, _end;
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extern int _ramstart, _ramend;
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extern char _target_name[];
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extern void h8300_gpio_init(void);
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#if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) \
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&& defined(CONFIG_GDB_MAGICPRINT)
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/* printk with gdb service */
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static void gdb_console_output(struct console *c, const char *msg, unsigned len)
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{
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for (; len > 0; len--) {
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asm("mov.w %0,r2\n\t"
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"jsr @0xc4"::"r"(*msg++):"er2");
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}
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}
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/*
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* Setup initial baud/bits/parity. We do two things here:
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* - construct a cflag setting for the first rs_open()
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* - initialize the serial port
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* Return non-zero if we didn't find a serial port.
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*/
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static int __init gdb_console_setup(struct console *co, char *options)
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{
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return 0;
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}
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static const struct console gdb_console = {
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.name = "gdb_con",
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.write = gdb_console_output,
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.device = NULL,
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.setup = gdb_console_setup,
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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#endif
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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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memory_start = (unsigned long) &_ramstart;
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/* allow for ROMFS on the end of the kernel */
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if (memcmp((void *)memory_start, "-rom1fs-", 8) == 0) {
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#if defined(CONFIG_BLK_DEV_INITRD)
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initrd_start = memory_start;
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initrd_end = memory_start += be32_to_cpu(((unsigned long *) (memory_start))[2]);
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#else
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memory_start += be32_to_cpu(((unsigned long *) memory_start)[2]);
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#endif
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}
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memory_start = PAGE_ALIGN(memory_start);
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#if !defined(CONFIG_BLKDEV_RESERVE)
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memory_end = (unsigned long) &_ramend; /* by now the stack is part of the init task */
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#if defined(CONFIG_GDB_DEBUG)
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memory_end -= STUBSIZE;
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#endif
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#else
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if ((memory_end < CONFIG_BLKDEV_RESERVE_ADDRESS) &&
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(memory_end > CONFIG_BLKDEV_RESERVE_ADDRESS))
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/* overlap userarea */
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memory_end = CONFIG_BLKDEV_RESERVE_ADDRESS;
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#endif
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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) 0;
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#if (defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)) && defined(CONFIG_GDB_MAGICPRINT)
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register_console((struct console *)&gdb_console);
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#endif
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printk(KERN_INFO "\r\n\nuClinux " CPU "\n");
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printk(KERN_INFO "Target Hardware: %s\n",_target_name);
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printk(KERN_INFO "Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
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printk(KERN_INFO "H8/300 series support by Yoshinori Sato <ysato@users.sourceforge.jp>\n");
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#ifdef DEBUG
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printk(KERN_DEBUG "KERNEL -> TEXT=0x%06x-0x%06x DATA=0x%06x-0x%06x "
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"BSS=0x%06x-0x%06x\n", (int) &_stext, (int) &_etext,
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(int) &_sdata, (int) &_edata,
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(int) &_sbss, (int) &_ebss);
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printk(KERN_DEBUG "KERNEL -> ROMFS=0x%06x-0x%06x MEM=0x%06x-0x%06x "
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"STACK=0x%06x-0x%06x\n",
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(int) &_ebss, (int) memory_start,
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(int) memory_start, (int) memory_end,
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(int) memory_end, (int) &_ramend);
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#endif
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#ifdef CONFIG_DEFAULT_CMDLINE
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/* set from default command line */
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if (*command_line == '\0')
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strcpy(command_line,CONFIG_KERNEL_COMMAND);
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#endif
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/* Keep a copy of command line */
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*cmdline_p = &command_line[0];
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memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
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boot_command_line[COMMAND_LINE_SIZE-1] = 0;
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#ifdef DEBUG
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if (strlen(*cmdline_p))
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printk(KERN_DEBUG "Command line: '%s'\n", *cmdline_p);
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#endif
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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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bootmap_size = init_bootmem_node(
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NODE_DATA(0),
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memory_start >> PAGE_SHIFT, /* map goes here */
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PAGE_OFFSET >> PAGE_SHIFT, /* 0 on coldfire */
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memory_end >> PAGE_SHIFT);
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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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free_bootmem(memory_start, memory_end - memory_start);
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reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);
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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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h8300_gpio_init();
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#if defined(CONFIG_H8300_AKI3068NET) && defined(CONFIG_IDE)
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{
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#define AREABIT(addr) (1 << (((addr) >> 21) & 7))
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/* setup BSC */
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volatile unsigned char *abwcr = (volatile unsigned char *)ABWCR;
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volatile unsigned char *cscr = (volatile unsigned char *)CSCR;
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*abwcr &= ~(AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT));
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*cscr |= (AREABIT(CONFIG_H8300_IDE_BASE) | AREABIT(CONFIG_H8300_IDE_ALT)) | 0x0f;
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}
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#endif
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#ifdef DEBUG
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printk(KERN_DEBUG "Done setup_arch\n");
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#endif
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}
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/*
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* Get CPU information for use by the procfs.
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*/
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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char *cpu;
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int mode;
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u_long clockfreq;
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cpu = CPU;
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mode = *(volatile unsigned char *)MDCR & 0x07;
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clockfreq = CONFIG_CPU_CLOCK;
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seq_printf(m, "CPU:\t\t%s (mode:%d)\n"
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"Clock:\t\t%lu.%1luMHz\n"
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"BogoMips:\t%lu.%02lu\n"
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"Calibration:\t%lu loops\n",
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cpu,mode,
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clockfreq/1000,clockfreq%1000,
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(loops_per_jiffy*HZ)/500000,((loops_per_jiffy*HZ)/5000)%100,
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(loops_per_jiffy*HZ));
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return 0;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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return *pos < NR_CPUS ? ((void *) 0x12345678) : NULL;
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return c_start(m, pos);
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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const struct seq_operations cpuinfo_op = {
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.start = c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo,
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};
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