Lines Matching +full:reset +full:- +full:mode

1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <asm/processor-flags.h>
6 #include <asm/msr-index.h>
11  * mode and jumping to the BIOS reset entry point, as if the CPU has
12  * really been reset.  The previous version asked the keyboard
13  * controller to pulse the CPU reset line, which is more thorough, but
30 	/* Disable paging to drop us out of long mode */
46 	/* Set up the IDT for real mode. */
51 	 * mode.  The GDT is not used in real mode; it is just needed here to
57 	 * Load the data segment registers with 16-bit compatible values
69  * This is 16-bit protected mode code to disable paging and the cache,
70  * switch to real mode and jump to the BIOS reset code.
72  * The instruction that switches to real mode by writing to CR0 must be
74  * valid value for real mode, and flushes the prefetch queue to avoid
76  * mode.
79  * (protected-mode enable) and TS (task switch for coprocessor state
82  * is more like the state of a 486 after reset.  I don't know if
85  * More could be done here to set up the registers as if a CPU reset had
104 	testl	$0x60000000, %edx	/* If no cache bits -> no wbinvd */
132 	.word	0xffff		/* Length - real mode default value */
133 	.long	0		/* Base - real mode default value */
138 	/* Self-pointer */
139 	.word	0xffff		/* Length - real mode default value */
144 	 * 16-bit code segment pointing to real_mode_seg
152 	 * 16-bit data segment with the selector value 16 = 0x10 and
153 	 * base value 0x100; since this is consistent with real mode