linux-2.6.33/early_trap_init()(arm) の履歴(No.2)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-2.6.33/early_trap_init()(arm) へ行く。
  • 1 (2010-11-22 (月) 14:23:48)
  • 2 (2010-11-22 (月) 14:36:28)
  • 3 (2010-11-24 (水) 10:03:27)
  • 4 (2010-11-24 (水) 14:06:52)

---

参照元†

• linux-2.6.33/early_trap_init()

説明†

• パス: linux-2.6.33/arch/arm/kernel/traps.c

• FIXME: これは何？
  • 割り込みベクタの初期化を行う。

割り込みベクタ、補助ルーチンの配置
----------------------------------------
(*1) vectors = CONFIG_VECTORS_BASE
(*2) kuser_sz = __kuser_helper_start 〜 __kuser_helper_end のサイズ

vectors --> +--------+
            |        |
            |        |  <-- __vectors_start 〜 __vectors_end をコピー
            |        |
            |        |
vectors --> +--------+
 + 0x200    |        |
            |        |  <-- __stubs_start 〜 __stubs_end をコピー
            |        |
            |        |
vectors --> +--------+
 + stubs の |        |
  サイズ    |        |
            |   空   |
            |        |
            |        |
vectors --> +--------+
 - kuser_sz |        |
            |        |  <-- __kuser_helper_start 〜 __kuser_helper_end をコピー
            |        |
            |        |
vectors --> +--------+
 + 0x1000

引数†

• なし

返り値†

• なし

参考†

実装†

void __init early_trap_init(void)
{
	unsigned long vectors = CONFIG_VECTORS_BASE;

• • [[linux-2.6.33/]]

	extern char __stubs_start[], __stubs_end[];
	extern char __vectors_start[], __vectors_end[];
	extern char __kuser_helper_start[], __kuser_helper_end[];
	int kuser_sz = __kuser_helper_end - __kuser_helper_start;

• • linux-2.6.33/__stubs_start(global)

• linux-2.6.33/__stubs_end(global)

• • linux-2.6.33/__vectors_start(global)

• linux-2.6.33/__vectors_end(global)

• • linux-2.6.33/__kuser_helper_start(global)

• linux-2.6.33/__kuser_helper_end(global)

	/*
	 * Copy the vectors, stubs and kuser helpers (in entry-armv.S)
	 * into the vector page, mapped at 0xffff0000, and ensure these
	 * are visible to the instruction stream.
	 */
	memcpy((void *)vectors, __vectors_start, __vectors_end - __vectors_start);

• • linux-2.6.33/memcpy()

	memcpy((void *)vectors + 0x200, __stubs_start, __stubs_end - __stubs_start);
	memcpy((void *)vectors + 0x1000 - kuser_sz, __kuser_helper_start, kuser_sz);

	/*
	 * Copy signal return handlers into the vector page, and
	 * set sigreturn to be a pointer to these.
	 */
	memcpy((void *)KERN_SIGRETURN_CODE, sigreturn_codes,
	       sizeof(sigreturn_codes));

• • linux-2.6.33/KERN_SIGRETURN_CODE

• linux-2.6.33/sigreturn_codes()

	memcpy((void *)KERN_RESTART_CODE, syscall_restart_code,
	       sizeof(syscall_restart_code));

• • linux-2.6.33/KERN_RESTART_CODE

• linux-2.6.33/syscall_restart_code()

	flush_icache_range(vectors, vectors + PAGE_SIZE);

• • linux-2.6.33/flush_icache_range()

	modify_domain(DOMAIN_USER, DOMAIN_CLIENT);

• • linux-2.6.33/modify_domain()

• linux-2.6.33/DOMAIN_USER

• • linux-2.6.33/DOMAIN_CLIENT

}

コメント†