setup.c

linux 内核源代码

	early_serial_setup(&__frv_uart0);
#endif
#ifndef CONFIG_GDBSTUB_UART1
	__reg(UART1_BASE + UART_IER * 8) = 0;
	early_serial_setup(&__frv_uart1);
#endif
#endif

	/* deal with the command line - RedBoot may have passed one to the kernel */
	memcpy(command_line, boot_command_line, sizeof(command_line));
	*cmdline_p = &command_line[0];
	parse_cmdline_early(command_line);

	/* set up the memory description
	 * - by now the stack is part of the init task */
	printk("Memory %08lx-%08lx\n", memory_start, memory_end);

	BUG_ON(memory_start == memory_end);

	init_mm.start_code = (unsigned long) &_stext;
	init_mm.end_code = (unsigned long) &_etext;
	init_mm.end_data = (unsigned long) &_edata;
#if 0 /* DAVIDM - don't set brk just incase someone decides to use it */
	init_mm.brk = (unsigned long) &_end;
#else
	init_mm.brk = (unsigned long) 0;
#endif

#ifdef DEBUG
	printk("KERNEL -> TEXT=0x%06x-0x%06x DATA=0x%06x-0x%06x BSS=0x%06x-0x%06x\n",
	       (int) &_stext, (int) &_etext,
	       (int) &_sdata, (int) &_edata,
	       (int) &_sbss, (int) &_ebss);
#endif

#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
        conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
        conswitchp = &dummy_con;
#endif
#endif

#ifdef CONFIG_MMU
	setup_linux_memory();
#else
	setup_uclinux_memory();
#endif

	/* get kmalloc into gear */
	paging_init();

	/* init DMA */
	frv_dma_init();
#ifdef DEBUG
	printk("Done setup_arch\n");
#endif

	/* start the decrement timer running */
//	asm volatile("movgs %0,timerd" :: "r"(10000000));
//	__set_HSR(0, __get_HSR(0) | HSR0_ETMD);

} /* end setup_arch() */

#if 0
/*****************************************************************************/
/*
 *
 */
static int __devinit setup_arch_serial(void)
{
	/* register those serial ports that are available */
#ifndef CONFIG_GDBSTUB_UART0
	early_serial_setup(&__frv_uart0);
#endif
#ifndef CONFIG_GDBSTUB_UART1
	early_serial_setup(&__frv_uart1);
#endif

	return 0;
} /* end setup_arch_serial() */

late_initcall(setup_arch_serial);
#endif

/*****************************************************************************/
/*
 * set up the memory map for normal MMU linux
 */
#ifdef CONFIG_MMU
static void __init setup_linux_memory(void)
{
	unsigned long bootmap_size, low_top_pfn, kstart, kend, high_mem;

	kstart	= (unsigned long) &__kernel_image_start - PAGE_OFFSET;
	kend	= (unsigned long) &__kernel_image_end - PAGE_OFFSET;

	kstart = kstart & PAGE_MASK;
	kend = (kend + PAGE_SIZE - 1) & PAGE_MASK;

	/* give all the memory to the bootmap allocator,  tell it to put the
	 * boot mem_map immediately following the kernel image
	 */
	bootmap_size = init_bootmem_node(NODE_DATA(0),
					 kend >> PAGE_SHIFT,		/* map addr */
					 memory_start >> PAGE_SHIFT,	/* start of RAM */
					 memory_end >> PAGE_SHIFT	/* end of RAM */
					 );

	/* pass the memory that the kernel can immediately use over to the bootmem allocator */
	max_mapnr = num_physpages = (memory_end - memory_start) >> PAGE_SHIFT;
	low_top_pfn = (KERNEL_LOWMEM_END - KERNEL_LOWMEM_START) >> PAGE_SHIFT;
	high_mem = 0;

	if (num_physpages > low_top_pfn) {
#ifdef CONFIG_HIGHMEM
		high_mem = num_physpages - low_top_pfn;
#else
		max_mapnr = num_physpages = low_top_pfn;
#endif
	}
	else {
		low_top_pfn = num_physpages;
	}

	min_low_pfn = memory_start >> PAGE_SHIFT;
	max_low_pfn = low_top_pfn;
	max_pfn = memory_end >> PAGE_SHIFT;

	num_mappedpages = low_top_pfn;

	printk(KERN_NOTICE "%ldMB LOWMEM available.\n", low_top_pfn >> (20 - PAGE_SHIFT));

	free_bootmem(memory_start, low_top_pfn << PAGE_SHIFT);

#ifdef CONFIG_HIGHMEM
	if (high_mem)
		printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", high_mem >> (20 - PAGE_SHIFT));
#endif

	/* take back the memory occupied by the kernel image and the bootmem alloc map */
	reserve_bootmem(kstart, kend - kstart + bootmap_size);

	/* reserve the memory occupied by the initial ramdisk */
#ifdef CONFIG_BLK_DEV_INITRD
	if (LOADER_TYPE && INITRD_START) {
		if (INITRD_START + INITRD_SIZE <= (low_top_pfn << PAGE_SHIFT)) {
			reserve_bootmem(INITRD_START, INITRD_SIZE);
			initrd_start = INITRD_START + PAGE_OFFSET;
			initrd_end = initrd_start + INITRD_SIZE;
		}
		else {
			printk(KERN_ERR
			       "initrd extends beyond end of memory (0x%08lx > 0x%08lx)\n"
			       "disabling initrd\n",
			       INITRD_START + INITRD_SIZE,
			       low_top_pfn << PAGE_SHIFT);
			initrd_start = 0;
		}
	}
#endif

} /* end setup_linux_memory() */
#endif

/*****************************************************************************/
/*
 * set up the memory map for uClinux
 */
#ifndef CONFIG_MMU
static void __init setup_uclinux_memory(void)
{
#ifdef CONFIG_PROTECT_KERNEL
	unsigned long dampr;
#endif
	unsigned long kend;
	int bootmap_size;

	kend = (unsigned long) &__kernel_image_end;
	kend = (kend + PAGE_SIZE - 1) & PAGE_MASK;

	/* give all the memory to the bootmap allocator,  tell it to put the
	 * boot mem_map immediately following the kernel image
	 */
	bootmap_size = init_bootmem_node(NODE_DATA(0),
					 kend >> PAGE_SHIFT,		/* map addr */
					 memory_start >> PAGE_SHIFT,	/* start of RAM */
					 memory_end >> PAGE_SHIFT	/* end of RAM */
					 );

	/* free all the usable memory */
	free_bootmem(memory_start, memory_end - memory_start);

	high_memory = (void *) (memory_end & PAGE_MASK);
	max_mapnr = num_physpages = ((unsigned long) high_memory - PAGE_OFFSET) >> PAGE_SHIFT;

	min_low_pfn = memory_start >> PAGE_SHIFT;
	max_low_pfn = memory_end >> PAGE_SHIFT;
	max_pfn = max_low_pfn;

	/* now take back the bits the core kernel is occupying */
#ifndef CONFIG_PROTECT_KERNEL
	reserve_bootmem(kend, bootmap_size);
	reserve_bootmem((unsigned long) &__kernel_image_start,
			kend - (unsigned long) &__kernel_image_start);

#else
	dampr = __get_DAMPR(0);
	dampr &= xAMPRx_SS;
	dampr = (dampr >> 4) + 17;
	dampr = 1 << dampr;

	reserve_bootmem(__get_DAMPR(0) & xAMPRx_PPFN, dampr);
#endif

	/* reserve some memory to do uncached DMA through if requested */
#ifdef CONFIG_RESERVE_DMA_COHERENT
	if (dma_coherent_mem_start)
		reserve_bootmem(dma_coherent_mem_start,
				dma_coherent_mem_end - dma_coherent_mem_start);
#endif

} /* end setup_uclinux_memory() */
#endif

/*****************************************************************************/
/*
 * get CPU information for use by procfs
 */
static int show_cpuinfo(struct seq_file *m, void *v)
{
	const char *gr, *fr, *fm, *fp, *cm, *nem, *ble;
#ifdef CONFIG_PM
	const char *sep;
#endif

	gr  = cpu_hsr0_all & HSR0_GRHE	? "gr0-63"	: "gr0-31";
	fr  = cpu_hsr0_all & HSR0_FRHE	? "fr0-63"	: "fr0-31";
	fm  = cpu_psr_all  & PSR_EM	? ", Media"	: "";
	fp  = cpu_psr_all  & PSR_EF	? ", FPU"	: "";
	cm  = cpu_psr_all  & PSR_CM	? ", CCCR"	: "";
	nem = cpu_psr_all  & PSR_NEM	? ", NE"	: "";
	ble = cpu_psr_all  & PSR_BE	? "BE"		: "LE";

	seq_printf(m,
		   "CPU-Series:\t%s\n"
		   "CPU-Core:\t%s, %s, %s%s%s\n"
		   "CPU:\t\t%s\n"
		   "MMU:\t\t%s\n"
		   "FP-Media:\t%s%s%s\n"
		   "System:\t\t%s",
		   cpu_series,
		   cpu_core, gr, ble, cm, nem,
		   cpu_silicon,
		   cpu_mmu,
		   fr, fm, fp,
		   cpu_system);

	if (cpu_board1)
		seq_printf(m, ", %s", cpu_board1);

	if (cpu_board2)
		seq_printf(m, ", %s", cpu_board2);

	seq_printf(m, "\n");

#ifdef CONFIG_PM
	seq_printf(m, "PM-Controls:");
	sep = "\t";

	if (clock_bits_settable & CLOCK_BIT_CMODE) {
		seq_printf(m, "%scmode=0x%04hx", sep, clock_cmodes_permitted);
		sep = ", ";
	}

	if (clock_bits_settable & CLOCK_BIT_CM) {
		seq_printf(m, "%scm=0x%lx", sep, clock_bits_settable & CLOCK_BIT_CM);
		sep = ", ";
	}

	if (clock_bits_settable & CLOCK_BIT_P0) {
		seq_printf(m, "%sp0=0x3", sep);
		sep = ", ";
	}

	seq_printf(m, "%ssuspend=0x22\n", sep);
#endif

	seq_printf(m,
		   "PM-Status:\tcmode=%d, cm=%d, p0=%d\n",
		   clock_cmode_current, clock_cm_current, clock_p0_current);

#define print_clk(TAG, VAR) \
	seq_printf(m, "Clock-" TAG ":\t%lu.%2.2lu MHz\n", VAR / 1000000, (VAR / 10000) % 100)

	print_clk("In",    __clkin_clock_speed_HZ);
	print_clk("Core",  __core_clock_speed_HZ);
	print_clk("SDRAM", __sdram_clock_speed_HZ);
	print_clk("CBus",  __core_bus_clock_speed_HZ);
	print_clk("Res",   __res_bus_clock_speed_HZ);
	print_clk("Ext",   __ext_bus_clock_speed_HZ);
	print_clk("DSU",   __dsu_clock_speed_HZ);

	seq_printf(m,
		   "BogoMips:\t%lu.%02lu\n",
		   (loops_per_jiffy * HZ) / 500000, ((loops_per_jiffy * HZ) / 5000) % 100);

	return 0;
} /* end show_cpuinfo() */

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos < NR_CPUS ? (void *) 0x12345678 : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

struct seq_operations cpuinfo_op = {
	.start	= c_start,
	.next	= c_next,
	.stop	= c_stop,
	.show	= show_cpuinfo,
};

void arch_gettod(int *year, int *mon, int *day, int *hour,
		 int *min, int *sec)
{
	*year = *mon = *day = *hour = *min = *sec = 0;
}

/*****************************************************************************/
/*
 *
 */
#ifdef CONFIG_MB93090_MB00
static void __init mb93090_sendlcdcmd(uint32_t cmd)
{
	unsigned long base = __addr_LCD();
	int loop;

	/* request reading of the busy flag */
	__set_LCD(base, LCD_CMD_READ_BUSY);
	__set_LCD(base, LCD_CMD_READ_BUSY & ~LCD_E);

	/* wait for the busy flag to become clear */
	for (loop = 10000; loop > 0; loop--)
		if (!(__get_LCD(base) & 0x80))
			break;

	/* send the command */
	__set_LCD(base, cmd);
	__set_LCD(base, cmd & ~LCD_E);

} /* end mb93090_sendlcdcmd() */

/*****************************************************************************/
/*
 * write to the MB93090 LEDs and LCD
 */
static void __init mb93090_display(void)
{
	const char *p;

	__set_LEDS(0);

	/* set up the LCD */
	mb93090_sendlcdcmd(LCD_CMD_CLEAR);
	mb93090_sendlcdcmd(LCD_CMD_FUNCSET(1,1,0));
	mb93090_sendlcdcmd(LCD_CMD_ON(0,0));
	mb93090_sendlcdcmd(LCD_CMD_HOME);

	mb93090_sendlcdcmd(LCD_CMD_SET_DD_ADDR(0));
	for (p = mb93090_banner; *p; p++)
		mb93090_sendlcdcmd(LCD_DATA_WRITE(*p));

	mb93090_sendlcdcmd(LCD_CMD_SET_DD_ADDR(64));
	for (p = mb93090_version; *p; p++)
		mb93090_sendlcdcmd(LCD_DATA_WRITE(*p));

} /* end mb93090_display() */

#endif // CONFIG_MB93090_MB00