| /* |
| * Copyright (c) 2019 Intel Corporation |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <zephyr/arch/x86/multiboot.h> |
| |
| /* |
| * This is included by ia32/crt0.S and intel64/locore.S |
| * at their 32-bit entry points to cover common ground. |
| */ |
| |
| #ifdef CONFIG_MULTIBOOT_INFO |
| /* |
| * If we were loaded by a multiboot-compliant loader, then EAX |
| * contains MULTIBOOT_EAX_MAGIC and EBX points to a valid 'struct |
| * multiboot_info'; otherwise EBX is just junk. Check EAX early |
| * before it's clobbered and leave a sentinel (0) in EBX if invalid. |
| * The valid in EBX will be the argument to z_x86_prep_c(), so the |
| * subsequent code must, of course, be sure to preserve it meanwhile. |
| */ |
| |
| cmpl $MULTIBOOT_EAX_MAGIC, %eax |
| je 1f |
| xorl %ebx, %ebx |
| 1: |
| #endif |
| |
| #ifdef CONFIG_PIC_DISABLE |
| /* |
| * "Disable" legacy i8259 interrupt controllers. Note that we |
| * can't actually disable them, but we mask all their interrupt |
| * sources which is effectively the same thing (almost). |
| */ |
| |
| movb $0xff, %al |
| outb %al, $0x21 |
| outb %al, $0xA1 |
| #endif |
| |
| #ifdef CONFIG_MULTIBOOT |
| jmp 1f |
| |
| .align 4 |
| .long MULTIBOOT_HEADER_MAGIC |
| .long MULTIBOOT_HEADER_FLAGS |
| .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) |
| #ifdef CONFIG_MULTIBOOT_FRAMEBUF |
| .fill 5,4,0 /* (unused exec layout) */ |
| .long 0 /* linear graphics mode */ |
| .long CONFIG_MULTIBOOT_FRAMEBUF_X /* width */ |
| .long CONFIG_MULTIBOOT_FRAMEBUF_Y /* height */ |
| .long 32 /* depth */ |
| #endif /* CONFIG_MULTIBOOT_FRAMEBUF */ |
| 1: |
| #endif |
