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/*
* Copyright (c) 2010-2014 Richard Braun.
*
* 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 3 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 <http://www.gnu.org/licenses/>.
*/
#ifndef _X86_BOOT_H
#define _X86_BOOT_H
#include <kern/macros.h>
#include <machine/vm_param.h>
#define VM_KERNEL_OFFSET VM_MIN_KERNEL_ADDRESS
#define STACK_SIZE PAGE_SIZE
#define pmap_pte_t void // XXX
/*
* Macros used by the very early panic functions.
*/
#define BOOT_CGAMEM 0xb8000
#define BOOT_CGACHARS (80 * 25)
#define BOOT_CGACOLOR 0x7
/*
* The kernel is physically loaded at BOOT_OFFSET by the boot loader. It
* is divided in two parts: the .boot section which uses physical addresses
* and the main kernel code and data at VM_KERNEL_OFFSET.
*
* See the linker script for more information.
*/
#define BOOT_OFFSET DECL_CONST(0x100000, UL)
/*
* Virtual to physical address translation macro.
*/
#define BOOT_VTOP(addr) ((addr) - VM_KERNEL_OFFSET)
/*
* Address where the MP trampoline code is copied and run at.
*
* It must reside at a free location in the first segment and be page
* aligned.
*/
#define BOOT_MP_TRAMPOLINE_ADDR 0x7000
#ifndef __ASSEMBLER__
#include "multiboot.h"
#include <machine/pmap.h>
/*
* Functions and data used before paging is enabled must be part of the .boot
* and .bootdata sections respectively, so that they use physical addresses.
* Once paging is enabled, their access relies on the kernel identity mapping.
*/
#define __boot __section(".boot.text")
#define __bootdata __section(".boot.data")
/*
* Boundaries of the .boot section.
*/
extern char _boot;
extern char _eboot;
extern char boot_stack[STACK_SIZE];
extern char boot_ap_stack[STACK_SIZE];
/*
* This variable contains the CPU ID of an AP during early initialization.
*/
extern unsigned int boot_ap_id;
/*
* Size of the trampoline code used for APs.
*/
extern uint32_t boot_mp_trampoline_size;
/*
* Address of the MP trampoline code.
*/
void boot_mp_trampoline(void);
/*
* Helper functions available before paging is enabled.
*
* Any memory passed to these must also be accessible without paging.
*/
void * boot_memmove(void *dest, const void *src, size_t n);
void * boot_memset(void *s, int c, size_t n);
size_t boot_strlen(const char *s);
void __noreturn boot_panic(const char *s);
/*
* This function is called by the bootstrap code before paging is enabled.
* It establishes a direct mapping of the kernel at virtual addresses and
* returns the physical address of the page directory. It is up to the
* caller to actually enable paging.
*
* TODO Update comment.
*/
pmap_pte_t * boot_setup_paging(const struct multiboot_raw_info *mbi,
unsigned long eax);
/*
* Main entry point, called directly after basic paging is initialized.
*/
void boot_main(void);
/*
* Entry point for APs.
*/
void boot_ap_main(void);
#endif /* __ASSEMBLER__ */
#endif /* _X86_BOOT_H */
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