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-rw-r--r--arch/xtensa/kernel/setup.c740
1 files changed, 740 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
new file mode 100644
index 000000000..901990b82
--- /dev/null
+++ b/arch/xtensa/kernel/setup.c
@@ -0,0 +1,740 @@
+/*
+ * arch/xtensa/kernel/setup.c
+ *
+ * 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.
+ *
+ * Copyright (C) 1995 Linus Torvalds
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ * Copyright (C) 2014 - 2016 Cadence Design Systems Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ * Kevin Chea
+ * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/proc_fs.h>
+#include <linux/screen_info.h>
+#include <linux/kernel.h>
+#include <linux/percpu.h>
+#include <linux/cpu.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+
+#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
+# include <linux/console.h>
+#endif
+
+#ifdef CONFIG_PROC_FS
+# include <linux/seq_file.h>
+#endif
+
+#include <asm/bootparam.h>
+#include <asm/kasan.h>
+#include <asm/mmu_context.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/timex.h>
+#include <asm/platform.h>
+#include <asm/page.h>
+#include <asm/setup.h>
+#include <asm/param.h>
+#include <asm/smp.h>
+#include <asm/sysmem.h>
+
+#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
+struct screen_info screen_info = {
+ .orig_x = 0,
+ .orig_y = 24,
+ .orig_video_cols = 80,
+ .orig_video_lines = 24,
+ .orig_video_isVGA = 1,
+ .orig_video_points = 16,
+};
+#endif
+
+#ifdef CONFIG_BLK_DEV_INITRD
+extern unsigned long initrd_start;
+extern unsigned long initrd_end;
+int initrd_is_mapped = 0;
+extern int initrd_below_start_ok;
+#endif
+
+#ifdef CONFIG_USE_OF
+void *dtb_start = __dtb_start;
+#endif
+
+extern unsigned long loops_per_jiffy;
+
+/* Command line specified as configuration option. */
+
+static char __initdata command_line[COMMAND_LINE_SIZE];
+
+#ifdef CONFIG_CMDLINE_BOOL
+static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
+#endif
+
+#ifdef CONFIG_PARSE_BOOTPARAM
+/*
+ * Boot parameter parsing.
+ *
+ * The Xtensa port uses a list of variable-sized tags to pass data to
+ * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
+ * to be recognised. The list is terminated with a zero-sized
+ * BP_TAG_LAST tag.
+ */
+
+typedef struct tagtable {
+ u32 tag;
+ int (*parse)(const bp_tag_t*);
+} tagtable_t;
+
+#define __tagtable(tag, fn) static tagtable_t __tagtable_##fn \
+ __attribute__((used, section(".taglist"))) = { tag, fn }
+
+/* parse current tag */
+
+static int __init parse_tag_mem(const bp_tag_t *tag)
+{
+ struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
+
+ if (mi->type != MEMORY_TYPE_CONVENTIONAL)
+ return -1;
+
+ return memblock_add(mi->start, mi->end - mi->start);
+}
+
+__tagtable(BP_TAG_MEMORY, parse_tag_mem);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+
+static int __init parse_tag_initrd(const bp_tag_t* tag)
+{
+ struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
+
+ initrd_start = (unsigned long)__va(mi->start);
+ initrd_end = (unsigned long)__va(mi->end);
+
+ return 0;
+}
+
+__tagtable(BP_TAG_INITRD, parse_tag_initrd);
+
+#endif /* CONFIG_BLK_DEV_INITRD */
+
+#ifdef CONFIG_USE_OF
+
+static int __init parse_tag_fdt(const bp_tag_t *tag)
+{
+ dtb_start = __va(tag->data[0]);
+ return 0;
+}
+
+__tagtable(BP_TAG_FDT, parse_tag_fdt);
+
+#endif /* CONFIG_USE_OF */
+
+static int __init parse_tag_cmdline(const bp_tag_t* tag)
+{
+ strlcpy(command_line, (char *)(tag->data), COMMAND_LINE_SIZE);
+ return 0;
+}
+
+__tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
+
+static int __init parse_bootparam(const bp_tag_t* tag)
+{
+ extern tagtable_t __tagtable_begin, __tagtable_end;
+ tagtable_t *t;
+
+ /* Boot parameters must start with a BP_TAG_FIRST tag. */
+
+ if (tag->id != BP_TAG_FIRST) {
+ pr_warn("Invalid boot parameters!\n");
+ return 0;
+ }
+
+ tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
+
+ /* Parse all tags. */
+
+ while (tag != NULL && tag->id != BP_TAG_LAST) {
+ for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
+ if (tag->id == t->tag) {
+ t->parse(tag);
+ break;
+ }
+ }
+ if (t == &__tagtable_end)
+ pr_warn("Ignoring tag 0x%08x\n", tag->id);
+ tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
+ }
+
+ return 0;
+}
+#else
+static int __init parse_bootparam(const bp_tag_t *tag)
+{
+ pr_info("Ignoring boot parameters at %p\n", tag);
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_USE_OF
+
+#if !XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY
+unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
+EXPORT_SYMBOL(xtensa_kio_paddr);
+
+static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
+ int depth, void *data)
+{
+ const __be32 *ranges;
+ int len;
+
+ if (depth > 1)
+ return 0;
+
+ if (!of_flat_dt_is_compatible(node, "simple-bus"))
+ return 0;
+
+ ranges = of_get_flat_dt_prop(node, "ranges", &len);
+ if (!ranges)
+ return 1;
+ if (len == 0)
+ return 1;
+
+ xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
+ /* round down to nearest 256MB boundary */
+ xtensa_kio_paddr &= 0xf0000000;
+
+ init_kio();
+
+ return 1;
+}
+#else
+static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
+ int depth, void *data)
+{
+ return 1;
+}
+#endif
+
+void __init early_init_devtree(void *params)
+{
+ early_init_dt_scan(params);
+ of_scan_flat_dt(xtensa_dt_io_area, NULL);
+
+ if (!command_line[0])
+ strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
+}
+
+#endif /* CONFIG_USE_OF */
+
+/*
+ * Initialize architecture. (Early stage)
+ */
+
+void __init init_arch(bp_tag_t *bp_start)
+{
+ /* Initialize MMU. */
+
+ init_mmu();
+
+ /* Initialize initial KASAN shadow map */
+
+ kasan_early_init();
+
+ /* Parse boot parameters */
+
+ if (bp_start)
+ parse_bootparam(bp_start);
+
+#ifdef CONFIG_USE_OF
+ early_init_devtree(dtb_start);
+#endif
+
+#ifdef CONFIG_CMDLINE_BOOL
+ if (!command_line[0])
+ strlcpy(command_line, default_command_line, COMMAND_LINE_SIZE);
+#endif
+
+ /* Early hook for platforms */
+
+ platform_init(bp_start);
+}
+
+/*
+ * Initialize system. Setup memory and reserve regions.
+ */
+
+extern char _end[];
+extern char _stext[];
+extern char _WindowVectors_text_start;
+extern char _WindowVectors_text_end;
+extern char _DebugInterruptVector_text_start;
+extern char _DebugInterruptVector_text_end;
+extern char _KernelExceptionVector_text_start;
+extern char _KernelExceptionVector_text_end;
+extern char _UserExceptionVector_text_start;
+extern char _UserExceptionVector_text_end;
+extern char _DoubleExceptionVector_text_start;
+extern char _DoubleExceptionVector_text_end;
+#if XCHAL_EXCM_LEVEL >= 2
+extern char _Level2InterruptVector_text_start;
+extern char _Level2InterruptVector_text_end;
+#endif
+#if XCHAL_EXCM_LEVEL >= 3
+extern char _Level3InterruptVector_text_start;
+extern char _Level3InterruptVector_text_end;
+#endif
+#if XCHAL_EXCM_LEVEL >= 4
+extern char _Level4InterruptVector_text_start;
+extern char _Level4InterruptVector_text_end;
+#endif
+#if XCHAL_EXCM_LEVEL >= 5
+extern char _Level5InterruptVector_text_start;
+extern char _Level5InterruptVector_text_end;
+#endif
+#if XCHAL_EXCM_LEVEL >= 6
+extern char _Level6InterruptVector_text_start;
+extern char _Level6InterruptVector_text_end;
+#endif
+#ifdef CONFIG_SMP
+extern char _SecondaryResetVector_text_start;
+extern char _SecondaryResetVector_text_end;
+#endif
+
+static inline int __init_memblock mem_reserve(unsigned long start,
+ unsigned long end)
+{
+ return memblock_reserve(start, end - start);
+}
+
+void __init setup_arch(char **cmdline_p)
+{
+ pr_info("config ID: %08x:%08x\n",
+ get_sr(SREG_EPC), get_sr(SREG_EXCSAVE));
+ if (get_sr(SREG_EPC) != XCHAL_HW_CONFIGID0 ||
+ get_sr(SREG_EXCSAVE) != XCHAL_HW_CONFIGID1)
+ pr_info("built for config ID: %08x:%08x\n",
+ XCHAL_HW_CONFIGID0, XCHAL_HW_CONFIGID1);
+
+ *cmdline_p = command_line;
+ platform_setup(cmdline_p);
+ strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
+
+ /* Reserve some memory regions */
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ if (initrd_start < initrd_end) {
+ initrd_is_mapped = mem_reserve(__pa(initrd_start),
+ __pa(initrd_end)) == 0;
+ initrd_below_start_ok = 1;
+ } else {
+ initrd_start = 0;
+ }
+#endif
+
+ mem_reserve(__pa(_stext), __pa(_end));
+
+#ifdef CONFIG_VECTORS_OFFSET
+ mem_reserve(__pa(&_WindowVectors_text_start),
+ __pa(&_WindowVectors_text_end));
+
+ mem_reserve(__pa(&_DebugInterruptVector_text_start),
+ __pa(&_DebugInterruptVector_text_end));
+
+ mem_reserve(__pa(&_KernelExceptionVector_text_start),
+ __pa(&_KernelExceptionVector_text_end));
+
+ mem_reserve(__pa(&_UserExceptionVector_text_start),
+ __pa(&_UserExceptionVector_text_end));
+
+ mem_reserve(__pa(&_DoubleExceptionVector_text_start),
+ __pa(&_DoubleExceptionVector_text_end));
+
+#if XCHAL_EXCM_LEVEL >= 2
+ mem_reserve(__pa(&_Level2InterruptVector_text_start),
+ __pa(&_Level2InterruptVector_text_end));
+#endif
+#if XCHAL_EXCM_LEVEL >= 3
+ mem_reserve(__pa(&_Level3InterruptVector_text_start),
+ __pa(&_Level3InterruptVector_text_end));
+#endif
+#if XCHAL_EXCM_LEVEL >= 4
+ mem_reserve(__pa(&_Level4InterruptVector_text_start),
+ __pa(&_Level4InterruptVector_text_end));
+#endif
+#if XCHAL_EXCM_LEVEL >= 5
+ mem_reserve(__pa(&_Level5InterruptVector_text_start),
+ __pa(&_Level5InterruptVector_text_end));
+#endif
+#if XCHAL_EXCM_LEVEL >= 6
+ mem_reserve(__pa(&_Level6InterruptVector_text_start),
+ __pa(&_Level6InterruptVector_text_end));
+#endif
+
+#endif /* CONFIG_VECTORS_OFFSET */
+
+#ifdef CONFIG_SMP
+ mem_reserve(__pa(&_SecondaryResetVector_text_start),
+ __pa(&_SecondaryResetVector_text_end));
+#endif
+ parse_early_param();
+ bootmem_init();
+ kasan_init();
+ unflatten_and_copy_device_tree();
+
+#ifdef CONFIG_SMP
+ smp_init_cpus();
+#endif
+
+ paging_init();
+ zones_init();
+
+#ifdef CONFIG_VT
+# if defined(CONFIG_VGA_CONSOLE)
+ conswitchp = &vga_con;
+# elif defined(CONFIG_DUMMY_CONSOLE)
+ conswitchp = &dummy_con;
+# endif
+#endif
+
+#ifdef CONFIG_PCI
+ platform_pcibios_init();
+#endif
+}
+
+static DEFINE_PER_CPU(struct cpu, cpu_data);
+
+static int __init topology_init(void)
+{
+ int i;
+
+ for_each_possible_cpu(i) {
+ struct cpu *cpu = &per_cpu(cpu_data, i);
+ cpu->hotpluggable = !!i;
+ register_cpu(cpu, i);
+ }
+
+ return 0;
+}
+subsys_initcall(topology_init);
+
+void cpu_reset(void)
+{
+#if XCHAL_HAVE_PTP_MMU && IS_ENABLED(CONFIG_MMU)
+ local_irq_disable();
+ /*
+ * We have full MMU: all autoload ways, ways 7, 8 and 9 of DTLB must
+ * be flushed.
+ * Way 4 is not currently used by linux.
+ * Ways 5 and 6 shall not be touched on MMUv2 as they are hardwired.
+ * Way 5 shall be flushed and way 6 shall be set to identity mapping
+ * on MMUv3.
+ */
+ local_flush_tlb_all();
+ invalidate_page_directory();
+#if XCHAL_HAVE_SPANNING_WAY
+ /* MMU v3 */
+ {
+ unsigned long vaddr = (unsigned long)cpu_reset;
+ unsigned long paddr = __pa(vaddr);
+ unsigned long tmpaddr = vaddr + SZ_512M;
+ unsigned long tmp0, tmp1, tmp2, tmp3;
+
+ /*
+ * Find a place for the temporary mapping. It must not be
+ * in the same 512MB region with vaddr or paddr, otherwise
+ * there may be multihit exception either on entry to the
+ * temporary mapping, or on entry to the identity mapping.
+ * (512MB is the biggest page size supported by TLB.)
+ */
+ while (((tmpaddr ^ paddr) & -SZ_512M) == 0)
+ tmpaddr += SZ_512M;
+
+ /* Invalidate mapping in the selected temporary area */
+ if (itlb_probe(tmpaddr) & BIT(ITLB_HIT_BIT))
+ invalidate_itlb_entry(itlb_probe(tmpaddr));
+ if (itlb_probe(tmpaddr + PAGE_SIZE) & BIT(ITLB_HIT_BIT))
+ invalidate_itlb_entry(itlb_probe(tmpaddr + PAGE_SIZE));
+
+ /*
+ * Map two consecutive pages starting at the physical address
+ * of this function to the temporary mapping area.
+ */
+ write_itlb_entry(__pte((paddr & PAGE_MASK) |
+ _PAGE_HW_VALID |
+ _PAGE_HW_EXEC |
+ _PAGE_CA_BYPASS),
+ tmpaddr & PAGE_MASK);
+ write_itlb_entry(__pte(((paddr & PAGE_MASK) + PAGE_SIZE) |
+ _PAGE_HW_VALID |
+ _PAGE_HW_EXEC |
+ _PAGE_CA_BYPASS),
+ (tmpaddr & PAGE_MASK) + PAGE_SIZE);
+
+ /* Reinitialize TLB */
+ __asm__ __volatile__ ("movi %0, 1f\n\t"
+ "movi %3, 2f\n\t"
+ "add %0, %0, %4\n\t"
+ "add %3, %3, %5\n\t"
+ "jx %0\n"
+ /*
+ * No literal, data or stack access
+ * below this point
+ */
+ "1:\n\t"
+ /* Initialize *tlbcfg */
+ "movi %0, 0\n\t"
+ "wsr %0, itlbcfg\n\t"
+ "wsr %0, dtlbcfg\n\t"
+ /* Invalidate TLB way 5 */
+ "movi %0, 4\n\t"
+ "movi %1, 5\n"
+ "1:\n\t"
+ "iitlb %1\n\t"
+ "idtlb %1\n\t"
+ "add %1, %1, %6\n\t"
+ "addi %0, %0, -1\n\t"
+ "bnez %0, 1b\n\t"
+ /* Initialize TLB way 6 */
+ "movi %0, 7\n\t"
+ "addi %1, %9, 3\n\t"
+ "addi %2, %9, 6\n"
+ "1:\n\t"
+ "witlb %1, %2\n\t"
+ "wdtlb %1, %2\n\t"
+ "add %1, %1, %7\n\t"
+ "add %2, %2, %7\n\t"
+ "addi %0, %0, -1\n\t"
+ "bnez %0, 1b\n\t"
+ "isync\n\t"
+ /* Jump to identity mapping */
+ "jx %3\n"
+ "2:\n\t"
+ /* Complete way 6 initialization */
+ "witlb %1, %2\n\t"
+ "wdtlb %1, %2\n\t"
+ /* Invalidate temporary mapping */
+ "sub %0, %9, %7\n\t"
+ "iitlb %0\n\t"
+ "add %0, %0, %8\n\t"
+ "iitlb %0"
+ : "=&a"(tmp0), "=&a"(tmp1), "=&a"(tmp2),
+ "=&a"(tmp3)
+ : "a"(tmpaddr - vaddr),
+ "a"(paddr - vaddr),
+ "a"(SZ_128M), "a"(SZ_512M),
+ "a"(PAGE_SIZE),
+ "a"((tmpaddr + SZ_512M) & PAGE_MASK)
+ : "memory");
+ }
+#endif
+#endif
+ __asm__ __volatile__ ("movi a2, 0\n\t"
+ "wsr a2, icountlevel\n\t"
+ "movi a2, 0\n\t"
+ "wsr a2, icount\n\t"
+#if XCHAL_NUM_IBREAK > 0
+ "wsr a2, ibreakenable\n\t"
+#endif
+#if XCHAL_HAVE_LOOPS
+ "wsr a2, lcount\n\t"
+#endif
+ "movi a2, 0x1f\n\t"
+ "wsr a2, ps\n\t"
+ "isync\n\t"
+ "jx %0\n\t"
+ :
+ : "a" (XCHAL_RESET_VECTOR_VADDR)
+ : "a2");
+ for (;;)
+ ;
+}
+
+void machine_restart(char * cmd)
+{
+ platform_restart();
+}
+
+void machine_halt(void)
+{
+ platform_halt();
+ while (1);
+}
+
+void machine_power_off(void)
+{
+ platform_power_off();
+ while (1);
+}
+#ifdef CONFIG_PROC_FS
+
+/*
+ * Display some core information through /proc/cpuinfo.
+ */
+
+static int
+c_show(struct seq_file *f, void *slot)
+{
+ /* high-level stuff */
+ seq_printf(f, "CPU count\t: %u\n"
+ "CPU list\t: %*pbl\n"
+ "vendor_id\t: Tensilica\n"
+ "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
+ "core ID\t\t: " XCHAL_CORE_ID "\n"
+ "build ID\t: 0x%x\n"
+ "config ID\t: %08x:%08x\n"
+ "byte order\t: %s\n"
+ "cpu MHz\t\t: %lu.%02lu\n"
+ "bogomips\t: %lu.%02lu\n",
+ num_online_cpus(),
+ cpumask_pr_args(cpu_online_mask),
+ XCHAL_BUILD_UNIQUE_ID,
+ get_sr(SREG_EPC), get_sr(SREG_EXCSAVE),
+ XCHAL_HAVE_BE ? "big" : "little",
+ ccount_freq/1000000,
+ (ccount_freq/10000) % 100,
+ loops_per_jiffy/(500000/HZ),
+ (loops_per_jiffy/(5000/HZ)) % 100);
+ seq_puts(f, "flags\t\t: "
+#if XCHAL_HAVE_NMI
+ "nmi "
+#endif
+#if XCHAL_HAVE_DEBUG
+ "debug "
+# if XCHAL_HAVE_OCD
+ "ocd "
+# endif
+#endif
+#if XCHAL_HAVE_DENSITY
+ "density "
+#endif
+#if XCHAL_HAVE_BOOLEANS
+ "boolean "
+#endif
+#if XCHAL_HAVE_LOOPS
+ "loop "
+#endif
+#if XCHAL_HAVE_NSA
+ "nsa "
+#endif
+#if XCHAL_HAVE_MINMAX
+ "minmax "
+#endif
+#if XCHAL_HAVE_SEXT
+ "sext "
+#endif
+#if XCHAL_HAVE_CLAMPS
+ "clamps "
+#endif
+#if XCHAL_HAVE_MAC16
+ "mac16 "
+#endif
+#if XCHAL_HAVE_MUL16
+ "mul16 "
+#endif
+#if XCHAL_HAVE_MUL32
+ "mul32 "
+#endif
+#if XCHAL_HAVE_MUL32_HIGH
+ "mul32h "
+#endif
+#if XCHAL_HAVE_FP
+ "fpu "
+#endif
+#if XCHAL_HAVE_S32C1I
+ "s32c1i "
+#endif
+ "\n");
+
+ /* Registers. */
+ seq_printf(f,"physical aregs\t: %d\n"
+ "misc regs\t: %d\n"
+ "ibreak\t\t: %d\n"
+ "dbreak\t\t: %d\n",
+ XCHAL_NUM_AREGS,
+ XCHAL_NUM_MISC_REGS,
+ XCHAL_NUM_IBREAK,
+ XCHAL_NUM_DBREAK);
+
+
+ /* Interrupt. */
+ seq_printf(f,"num ints\t: %d\n"
+ "ext ints\t: %d\n"
+ "int levels\t: %d\n"
+ "timers\t\t: %d\n"
+ "debug level\t: %d\n",
+ XCHAL_NUM_INTERRUPTS,
+ XCHAL_NUM_EXTINTERRUPTS,
+ XCHAL_NUM_INTLEVELS,
+ XCHAL_NUM_TIMERS,
+ XCHAL_DEBUGLEVEL);
+
+ /* Cache */
+ seq_printf(f,"icache line size: %d\n"
+ "icache ways\t: %d\n"
+ "icache size\t: %d\n"
+ "icache flags\t: "
+#if XCHAL_ICACHE_LINE_LOCKABLE
+ "lock "
+#endif
+ "\n"
+ "dcache line size: %d\n"
+ "dcache ways\t: %d\n"
+ "dcache size\t: %d\n"
+ "dcache flags\t: "
+#if XCHAL_DCACHE_IS_WRITEBACK
+ "writeback "
+#endif
+#if XCHAL_DCACHE_LINE_LOCKABLE
+ "lock "
+#endif
+ "\n",
+ XCHAL_ICACHE_LINESIZE,
+ XCHAL_ICACHE_WAYS,
+ XCHAL_ICACHE_SIZE,
+ XCHAL_DCACHE_LINESIZE,
+ XCHAL_DCACHE_WAYS,
+ XCHAL_DCACHE_SIZE);
+
+ return 0;
+}
+
+/*
+ * We show only CPU #0 info.
+ */
+static void *
+c_start(struct seq_file *f, loff_t *pos)
+{
+ return (*pos == 0) ? (void *)1 : NULL;
+}
+
+static void *
+c_next(struct seq_file *f, void *v, loff_t *pos)
+{
+ ++*pos;
+ return c_start(f, pos);
+}
+
+static void
+c_stop(struct seq_file *f, void *v)
+{
+}
+
+const struct seq_operations cpuinfo_op =
+{
+ .start = c_start,
+ .next = c_next,
+ .stop = c_stop,
+ .show = c_show,
+};
+
+#endif /* CONFIG_PROC_FS */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 11:45:56 +0000