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linux-sg2042/arch/blackfin/kernel/setup.c

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/*
* File: arch/blackfin/kernel/setup.c
* Based on:
* Author:
*
* Created:
* Description:
*
* Modified:
* Copyright 2004-2006 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/delay.h>
#include <linux/console.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/cpu.h>
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/ext2_fs.h>
#include <linux/cramfs_fs.h>
#include <linux/romfs_fs.h>
#include <asm/cplb.h>
#include <asm/cacheflush.h>
#include <asm/blackfin.h>
#include <asm/cplbinit.h>
#include <asm/div64.h>
#include <asm/fixed_code.h>
#include <asm/early_printk.h>
u16 _bfin_swrst;
unsigned long memory_start, memory_end, physical_mem_end;
unsigned long reserved_mem_dcache_on;
unsigned long reserved_mem_icache_on;
EXPORT_SYMBOL(memory_start);
EXPORT_SYMBOL(memory_end);
EXPORT_SYMBOL(physical_mem_end);
EXPORT_SYMBOL(_ramend);
#ifdef CONFIG_MTD_UCLINUX
unsigned long memory_mtd_end, memory_mtd_start, mtd_size;
unsigned long _ebss;
EXPORT_SYMBOL(memory_mtd_end);
EXPORT_SYMBOL(memory_mtd_start);
EXPORT_SYMBOL(mtd_size);
#endif
char __initdata command_line[COMMAND_LINE_SIZE];
void __init bf53x_cache_init(void)
{
#if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
generate_cpl_tables();
#endif
#ifdef CONFIG_BFIN_ICACHE
bfin_icache_init();
printk(KERN_INFO "Instruction Cache Enabled\n");
#endif
#ifdef CONFIG_BFIN_DCACHE
bfin_dcache_init();
printk(KERN_INFO "Data Cache Enabled"
# if defined CONFIG_BFIN_WB
" (write-back)"
# elif defined CONFIG_BFIN_WT
" (write-through)"
# endif
"\n");
#endif
}
void __init bf53x_relocate_l1_mem(void)
{
unsigned long l1_code_length;
unsigned long l1_data_a_length;
unsigned long l1_data_b_length;
l1_code_length = _etext_l1 - _stext_l1;
if (l1_code_length > L1_CODE_LENGTH)
l1_code_length = L1_CODE_LENGTH;
/* cannot complain as printk is not available as yet.
* But we can continue booting and complain later!
*/
/* Copy _stext_l1 to _etext_l1 to L1 instruction SRAM */
dma_memcpy(_stext_l1, _l1_lma_start, l1_code_length);
l1_data_a_length = _ebss_l1 - _sdata_l1;
if (l1_data_a_length > L1_DATA_A_LENGTH)
l1_data_a_length = L1_DATA_A_LENGTH;
/* Copy _sdata_l1 to _ebss_l1 to L1 data bank A SRAM */
dma_memcpy(_sdata_l1, _l1_lma_start + l1_code_length, l1_data_a_length);
l1_data_b_length = _ebss_b_l1 - _sdata_b_l1;
if (l1_data_b_length > L1_DATA_B_LENGTH)
l1_data_b_length = L1_DATA_B_LENGTH;
/* Copy _sdata_b_l1 to _ebss_b_l1 to L1 data bank B SRAM */
dma_memcpy(_sdata_b_l1, _l1_lma_start + l1_code_length +
l1_data_a_length, l1_data_b_length);
}
/*
* Initial parsing of the command line. Currently, we support:
* - Controlling the linux memory size: mem=xxx[KMG]
* - Controlling the physical memory size: max_mem=xxx[KMG][$][#]
* $ -> reserved memory is dcacheable
* # -> reserved memory is icacheable
*/
static __init void parse_cmdline_early(char *cmdline_p)
{
char c = ' ', *to = cmdline_p;
unsigned int memsize;
for (;;) {
if (c == ' ') {
if (!memcmp(to, "mem=", 4)) {
to += 4;
memsize = memparse(to, &to);
if (memsize)
_ramend = memsize;
} else if (!memcmp(to, "max_mem=", 8)) {
to += 8;
memsize = memparse(to, &to);
if (memsize) {
physical_mem_end = memsize;
if (*to != ' ') {
if (*to == '$'
|| *(to + 1) == '$')
reserved_mem_dcache_on =
1;
if (*to == '#'
|| *(to + 1) == '#')
reserved_mem_icache_on =
1;
}
}
} else if (!memcmp(to, "earlyprintk=", 12)) {
to += 12;
setup_early_printk(to);
}
}
c = *(to++);
if (!c)
break;
}
}
void __init setup_arch(char **cmdline_p)
{
int bootmap_size;
unsigned long l1_length, sclk, cclk;
#ifdef CONFIG_MTD_UCLINUX
unsigned long mtd_phys = 0;
#endif
#ifdef CONFIG_DUMMY_CONSOLE
conswitchp = &dummy_con;
#endif
#if defined(CONFIG_CMDLINE_BOOL)
strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
command_line[sizeof(command_line) - 1] = 0;
#endif
/* Keep a copy of command line */
*cmdline_p = &command_line[0];
memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
/* setup memory defaults from the user config */
physical_mem_end = 0;
_ramend = CONFIG_MEM_SIZE * 1024 * 1024;
parse_cmdline_early(&command_line[0]);
cclk = get_cclk();
sclk = get_sclk();
#if !defined(CONFIG_BFIN_KERNEL_CLOCK)
if (ANOMALY_05000273 && cclk == sclk)
panic("ANOMALY 05000273, SCLK can not be same as CCLK");
#endif
#ifdef BF561_FAMILY
if (ANOMALY_05000266) {
bfin_read_IMDMA_D0_IRQ_STATUS();
bfin_read_IMDMA_D1_IRQ_STATUS();
}
#endif
printk(KERN_INFO "Hardware Trace ");
if (bfin_read_TBUFCTL() & 0x1 )
printk("Active ");
else
printk("Off ");
if (bfin_read_TBUFCTL() & 0x2)
printk("and Enabled\n");
else
printk("and Disabled\n");
#if defined(CONFIG_CHR_DEV_FLASH) || defined(CONFIG_BLK_DEV_FLASH)
/* we need to initialize the Flashrom device here since we might
* do things with flash early on in the boot
*/
flash_probe();
#endif
if (physical_mem_end == 0)
physical_mem_end = _ramend;
/* by now the stack is part of the init task */
memory_end = _ramend - DMA_UNCACHED_REGION;
_ramstart = (unsigned long)__bss_stop;
_rambase = (unsigned long)_stext;
#ifdef CONFIG_MPU
/* Round up to multiple of 4MB. */
memory_start = (_ramstart + 0x3fffff) & ~0x3fffff;
#else
memory_start = PAGE_ALIGN(_ramstart);
#endif
#if defined(CONFIG_MTD_UCLINUX)
/* generic memory mapped MTD driver */
memory_mtd_end = memory_end;
mtd_phys = _ramstart;
mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 8)));
# if defined(CONFIG_EXT2_FS) || defined(CONFIG_EXT3_FS)
if (*((unsigned short *)(mtd_phys + 0x438)) == EXT2_SUPER_MAGIC)
mtd_size =
PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x404)) << 10);
# endif
# if defined(CONFIG_CRAMFS)
if (*((unsigned long *)(mtd_phys)) == CRAMFS_MAGIC)
mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x4)));
# endif
# if defined(CONFIG_ROMFS_FS)
if (((unsigned long *)mtd_phys)[0] == ROMSB_WORD0
&& ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1)
mtd_size =
PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys)[2]));
# if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
/* Due to a Hardware Anomaly we need to limit the size of usable
* instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
* 05000263 - Hardware loop corrupted when taking an ICPLB exception
*/
# if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
if (memory_end >= 56 * 1024 * 1024)
memory_end = 56 * 1024 * 1024;
# else
if (memory_end >= 60 * 1024 * 1024)
memory_end = 60 * 1024 * 1024;
# endif /* CONFIG_DEBUG_HUNT_FOR_ZERO */
# endif /* ANOMALY_05000263 */
# endif /* CONFIG_ROMFS_FS */
memory_end -= mtd_size;
if (mtd_size == 0) {
console_init();
panic("Don't boot kernel without rootfs attached.\n");
}
/* Relocate MTD image to the top of memory after the uncached memory area */
dma_memcpy((char *)memory_end, __bss_stop, mtd_size);
memory_mtd_start = memory_end;
_ebss = memory_mtd_start; /* define _ebss for compatible */
#endif /* CONFIG_MTD_UCLINUX */
#if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
/* Due to a Hardware Anomaly we need to limit the size of usable
* instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
* 05000263 - Hardware loop corrupted when taking an ICPLB exception
*/
#if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
if (memory_end >= 56 * 1024 * 1024)
memory_end = 56 * 1024 * 1024;
#else
if (memory_end >= 60 * 1024 * 1024)
memory_end = 60 * 1024 * 1024;
#endif /* CONFIG_DEBUG_HUNT_FOR_ZERO */
printk(KERN_NOTICE "Warning: limiting memory to %liMB due to hardware anomaly 05000263\n", memory_end >> 20);
#endif /* ANOMALY_05000263 */
#ifdef CONFIG_MPU
page_mask_nelts = ((_ramend >> PAGE_SHIFT) + 31) / 32;
page_mask_order = get_order(3 * page_mask_nelts * sizeof(long));
#endif
#if !defined(CONFIG_MTD_UCLINUX)
memory_end -= SIZE_4K; /*In case there is no valid CPLB behind memory_end make sure we don't get to close*/
#endif
init_mm.start_code = (unsigned long)_stext;
init_mm.end_code = (unsigned long)_etext;
init_mm.end_data = (unsigned long)_edata;
init_mm.brk = (unsigned long)0;
_bfin_swrst = bfin_read_SWRST();
if (_bfin_swrst & RESET_DOUBLE)
printk(KERN_INFO "Recovering from Double Fault event\n");
else if (_bfin_swrst & RESET_WDOG)
printk(KERN_INFO "Recovering from Watchdog event\n");
else if (_bfin_swrst & RESET_SOFTWARE)
printk(KERN_NOTICE "Reset caused by Software reset\n");
printk(KERN_INFO "Blackfin support (C) 2004-2007 Analog Devices, Inc.\n");
if (bfin_compiled_revid() == 0xffff)
printk(KERN_INFO "Compiled for ADSP-%s Rev any\n", CPU);
else if (bfin_compiled_revid() == -1)
printk(KERN_INFO "Compiled for ADSP-%s Rev none\n", CPU);
else
printk(KERN_INFO "Compiled for ADSP-%s Rev 0.%d\n", CPU, bfin_compiled_revid());
if (bfin_revid() != bfin_compiled_revid()) {
if (bfin_compiled_revid() == -1)
printk(KERN_ERR "Warning: Compiled for Rev none, but running on Rev %d\n",
bfin_revid());
else if (bfin_compiled_revid() != 0xffff)
printk(KERN_ERR "Warning: Compiled for Rev %d, but running on Rev %d\n",
bfin_compiled_revid(), bfin_revid());
}
if (bfin_revid() < SUPPORTED_REVID)
printk(KERN_ERR "Warning: Unsupported Chip Revision ADSP-%s Rev 0.%d detected\n",
CPU, bfin_revid());
printk(KERN_INFO "Blackfin Linux support by http://blackfin.uclinux.org/\n");
printk(KERN_INFO "Processor Speed: %lu MHz core clock and %lu MHz System Clock\n",
cclk / 1000000, sclk / 1000000);
if (ANOMALY_05000273 && (cclk >> 1) <= sclk)
printk("\n\n\nANOMALY_05000273: CCLK must be >= 2*SCLK !!!\n\n\n");
printk(KERN_INFO "Board Memory: %ldMB\n", physical_mem_end >> 20);
printk(KERN_INFO "Kernel Managed Memory: %ldMB\n", _ramend >> 20);
printk(KERN_INFO "Memory map:\n"
KERN_INFO " text = 0x%p-0x%p\n"
KERN_INFO " rodata = 0x%p-0x%p\n"
KERN_INFO " data = 0x%p-0x%p\n"
KERN_INFO " stack = 0x%p-0x%p\n"
KERN_INFO " init = 0x%p-0x%p\n"
KERN_INFO " bss = 0x%p-0x%p\n"
KERN_INFO " available = 0x%p-0x%p\n"
#ifdef CONFIG_MTD_UCLINUX
KERN_INFO " rootfs = 0x%p-0x%p\n"
#endif
#if DMA_UNCACHED_REGION > 0
KERN_INFO " DMA Zone = 0x%p-0x%p\n"
#endif
, _stext, _etext,
__start_rodata, __end_rodata,
_sdata, _edata,
(void *)&init_thread_union, (void *)((int)(&init_thread_union) + 0x2000),
__init_begin, __init_end,
__bss_start, __bss_stop,
(void *)_ramstart, (void *)memory_end
#ifdef CONFIG_MTD_UCLINUX
, (void *)memory_mtd_start, (void *)(memory_mtd_start + mtd_size)
#endif
#if DMA_UNCACHED_REGION > 0
, (void *)(_ramend - DMA_UNCACHED_REGION), (void *)(_ramend)
#endif
);
/*
* give all the memory to the bootmap allocator, tell it to put the
* boot mem_map at the start of memory
*/
bootmap_size = init_bootmem_node(NODE_DATA(0), memory_start >> PAGE_SHIFT, /* map goes here */
PAGE_OFFSET >> PAGE_SHIFT,
memory_end >> PAGE_SHIFT);
/*
* free the usable memory, we have to make sure we do not free
* the bootmem bitmap so we then reserve it after freeing it :-)
*/
free_bootmem(memory_start, memory_end - memory_start);
reserve_bootmem(memory_start, bootmap_size);
/*
* get kmalloc into gear
*/
paging_init();
/* check the size of the l1 area */
l1_length = _etext_l1 - _stext_l1;
if (l1_length > L1_CODE_LENGTH)
panic("L1 code memory overflow\n");
l1_length = _ebss_l1 - _sdata_l1;
if (l1_length > L1_DATA_A_LENGTH)
panic("L1 data memory overflow\n");
/* Copy atomic sequences to their fixed location, and sanity check that
these locations are the ones that we advertise to userspace. */
memcpy((void *)FIXED_CODE_START, &fixed_code_start,
FIXED_CODE_END - FIXED_CODE_START);
BUG_ON((char *)&sigreturn_stub - (char *)&fixed_code_start
!= SIGRETURN_STUB - FIXED_CODE_START);
BUG_ON((char *)&atomic_xchg32 - (char *)&fixed_code_start
!= ATOMIC_XCHG32 - FIXED_CODE_START);
BUG_ON((char *)&atomic_cas32 - (char *)&fixed_code_start
!= ATOMIC_CAS32 - FIXED_CODE_START);
BUG_ON((char *)&atomic_add32 - (char *)&fixed_code_start
!= ATOMIC_ADD32 - FIXED_CODE_START);
BUG_ON((char *)&atomic_sub32 - (char *)&fixed_code_start
!= ATOMIC_SUB32 - FIXED_CODE_START);
BUG_ON((char *)&atomic_ior32 - (char *)&fixed_code_start
!= ATOMIC_IOR32 - FIXED_CODE_START);
BUG_ON((char *)&atomic_and32 - (char *)&fixed_code_start
!= ATOMIC_AND32 - FIXED_CODE_START);
BUG_ON((char *)&atomic_xor32 - (char *)&fixed_code_start
!= ATOMIC_XOR32 - FIXED_CODE_START);
BUG_ON((char *)&safe_user_instruction - (char *)&fixed_code_start
!= SAFE_USER_INSTRUCTION - FIXED_CODE_START);
init_exception_vectors();
bf53x_cache_init();
}
static int __init topology_init(void)
{
#if defined (CONFIG_BF561)
static struct cpu cpu[2];
register_cpu(&cpu[0], 0);
register_cpu(&cpu[1], 1);
return 0;
#else
static struct cpu cpu[1];
return register_cpu(cpu, 0);
#endif
}
subsys_initcall(topology_init);
static u_long get_vco(void)
{
u_long msel;
u_long vco;
msel = (bfin_read_PLL_CTL() >> 9) & 0x3F;
if (0 == msel)
msel = 64;
vco = CONFIG_CLKIN_HZ;
vco >>= (1 & bfin_read_PLL_CTL()); /* DF bit */
vco = msel * vco;
return vco;
}
/* Get the Core clock */
u_long get_cclk(void)
{
u_long csel, ssel;
if (bfin_read_PLL_STAT() & 0x1)
return CONFIG_CLKIN_HZ;
ssel = bfin_read_PLL_DIV();
csel = ((ssel >> 4) & 0x03);
ssel &= 0xf;
if (ssel && ssel < (1 << csel)) /* SCLK > CCLK */
return get_vco() / ssel;
return get_vco() >> csel;
}
EXPORT_SYMBOL(get_cclk);
/* Get the System clock */
u_long get_sclk(void)
{
u_long ssel;
if (bfin_read_PLL_STAT() & 0x1)
return CONFIG_CLKIN_HZ;
ssel = (bfin_read_PLL_DIV() & 0xf);
if (0 == ssel) {
printk(KERN_WARNING "Invalid System Clock\n");
ssel = 1;
}
return get_vco() / ssel;
}
EXPORT_SYMBOL(get_sclk);
unsigned long sclk_to_usecs(unsigned long sclk)
{
u64 tmp = USEC_PER_SEC * (u64)sclk;
do_div(tmp, get_sclk());
return tmp;
}
EXPORT_SYMBOL(sclk_to_usecs);
unsigned long usecs_to_sclk(unsigned long usecs)
{
u64 tmp = get_sclk() * (u64)usecs;
do_div(tmp, USEC_PER_SEC);
return tmp;
}
EXPORT_SYMBOL(usecs_to_sclk);
/*
* Get CPU information for use by the procfs.
*/
static int show_cpuinfo(struct seq_file *m, void *v)
{
char *cpu, *mmu, *fpu, *vendor, *cache;
uint32_t revid;
u_long cclk = 0, sclk = 0;
u_int dcache_size = 0, dsup_banks = 0;
cpu = CPU;
mmu = "none";
fpu = "none";
revid = bfin_revid();
cclk = get_cclk();
sclk = get_sclk();
switch (bfin_read_CHIPID() & CHIPID_MANUFACTURE) {
case 0xca:
vendor = "Analog Devices";
break;
default:
vendor = "unknown";
break;
}
seq_printf(m, "processor\t: %d\n"
"vendor_id\t: %s\n"
"cpu family\t: 0x%x\n"
"model name\t: ADSP-%s %lu(MHz CCLK) %lu(MHz SCLK)\n"
"stepping\t: %d\n",
0,
vendor,
(bfin_read_CHIPID() & CHIPID_FAMILY),
cpu, cclk/1000000, sclk/1000000,
revid);
seq_printf(m, "cpu MHz\t\t: %lu.%03lu/%lu.%03lu\n",
cclk/1000000, cclk%1000000,
sclk/1000000, sclk%1000000);
seq_printf(m, "bogomips\t: %lu.%02lu\n"
"Calibration\t: %lu loops\n",
(loops_per_jiffy * HZ) / 500000,
((loops_per_jiffy * HZ) / 5000) % 100,
(loops_per_jiffy * HZ));
/* Check Cache configutation */
switch (bfin_read_DMEM_CONTROL() & (1 << DMC0_P | 1 << DMC1_P)) {
case ACACHE_BSRAM:
cache = "dbank-A/B\t: cache/sram";
dcache_size = 16;
dsup_banks = 1;
break;
case ACACHE_BCACHE:
cache = "dbank-A/B\t: cache/cache";
dcache_size = 32;
dsup_banks = 2;
break;
case ASRAM_BSRAM:
cache = "dbank-A/B\t: sram/sram";
dcache_size = 0;
dsup_banks = 0;
break;
default:
cache = "unknown";
dcache_size = 0;
dsup_banks = 0;
break;
}
/* Is it turned on? */
if (!((bfin_read_DMEM_CONTROL()) & (ENDCPLB | DMC_ENABLE)))
dcache_size = 0;
seq_printf(m, "cache size\t: %d KB(L1 icache) "
"%d KB(L1 dcache-%s) %d KB(L2 cache)\n",
BFIN_ICACHESIZE / 1024, dcache_size,
#if defined CONFIG_BFIN_WB
"wb"
#elif defined CONFIG_BFIN_WT
"wt"
#endif
"", 0);
seq_printf(m, "%s\n", cache);
seq_printf(m, "icache setup\t: %d Sub-banks/%d Ways, %d Lines/Way\n",
BFIN_ISUBBANKS, BFIN_IWAYS, BFIN_ILINES);
seq_printf(m,
"dcache setup\t: %d Super-banks/%d Sub-banks/%d Ways, %d Lines/Way\n",
dsup_banks, BFIN_DSUBBANKS, BFIN_DWAYS,
BFIN_DLINES);
#ifdef CONFIG_BFIN_ICACHE_LOCK
switch (read_iloc()) {
case WAY0_L:
seq_printf(m, "Way0 Locked-Down\n");
break;
case WAY1_L:
seq_printf(m, "Way1 Locked-Down\n");
break;
case WAY01_L:
seq_printf(m, "Way0,Way1 Locked-Down\n");
break;
case WAY2_L:
seq_printf(m, "Way2 Locked-Down\n");
break;
case WAY02_L:
seq_printf(m, "Way0,Way2 Locked-Down\n");
break;
case WAY12_L:
seq_printf(m, "Way1,Way2 Locked-Down\n");
break;
case WAY012_L:
seq_printf(m, "Way0,Way1 & Way2 Locked-Down\n");
break;
case WAY3_L:
seq_printf(m, "Way3 Locked-Down\n");
break;
case WAY03_L:
seq_printf(m, "Way0,Way3 Locked-Down\n");
break;
case WAY13_L:
seq_printf(m, "Way1,Way3 Locked-Down\n");
break;
case WAY013_L:
seq_printf(m, "Way 0,Way1,Way3 Locked-Down\n");
break;
case WAY32_L:
seq_printf(m, "Way3,Way2 Locked-Down\n");
break;
case WAY320_L:
seq_printf(m, "Way3,Way2,Way0 Locked-Down\n");
break;
case WAY321_L:
seq_printf(m, "Way3,Way2,Way1 Locked-Down\n");
break;
case WAYALL_L:
seq_printf(m, "All Ways are locked\n");
break;
default:
seq_printf(m, "No Ways are locked\n");
}
#endif
seq_printf(m, "board name\t: %s\n", bfin_board_name);
seq_printf(m, "board memory\t: %ld kB (0x%p -> 0x%p)\n",
physical_mem_end >> 10, (void *)0, (void *)physical_mem_end);
seq_printf(m, "kernel memory\t: %d kB (0x%p -> 0x%p)\n",
((int)memory_end - (int)_stext) >> 10,
_stext,
(void *)memory_end);
return 0;
}
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 __init cmdline_init(const char *r0)
{
if (r0)
strncpy(command_line, r0, COMMAND_LINE_SIZE);
}
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