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/*
* Copyright (C) 2014 René Kijewski <rene.kijewski@fu-berlin.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* Basic definitions and forwards for x86 boards.
*
* @defgroup x86 i586
* @ingroup cpu
* @{
* @file
* @author René Kijewski <rene.kijewski@fu-berlin.de>
*/
#ifndef CPU_X86_CPU_H_
#define CPU_X86_CPU_H_
#include "kernel_defines.h"
#include "irq.h"
#include "ucontext.h"
#include "cpu_conf.h"
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief x86 has architecture specific atomic_cas in x86_atomic.c
* @{
*/
#define ARCH_HAS_ATOMIC_COMPARE_AND_SWAP 1
/** @} */
/**
* @brief Disable interrupts and halt forever.
*
* This function is the last resort in case of an unrecoverable error.
* No message will be printed, no nothing.
*/
static inline void __attribute__((always_inline, noreturn)) x86_hlt(void)
{
while (1) {
__asm__ volatile ("cli");
__asm__ volatile ("hlt");
}
}
/**
* @brief Initialize subsystems and run kernel.
*
* Called by the board specific startup code.
* @li The .bss has to be cleared before.
* @li The stack has to be set up, probably somewhere in the low memory.
* @li The A20 line has to be activated, because all the code is beyond 1MB.
* @li Paging must be disabled.
* @li The SS, DS, and CS must span the whole 4GB of RAM.
* @li 32 bit protected mode must be entered.
* @li Interrupts must be disabled.
*/
void x86_startup(void) NORETURN;
/**
* @brief Setup board specific hardware and such.
*
* Called by x86_startup() after all generic subsystems are activated,
* and before kernel_init() gets called.
* Interrupts are disabled before, and are expected to be disabled after calling this function.
* Interrupts may be enabled during the course of this function call.
*
* Probably most of the board specific initialization should be done in auto_init():
* @li You must not spawn thread_create() in this function.
* @li The hwtimer is not set up properly at this point of executation.
*/
void x86_init_board(void);
/**
* @brief Returns a range of usable physical memory.
* @param[out] start Start address of the physical memory region.
* @param[out] len Total length of the physical memory region.
* One page are 0x1000 bytes.
* @param cnt Reentrant pointer. Must be zero on first call.
* The value is entirely opaque.
* @returns true iff there was a memory region set in start and len.
* false iff there are no more memory regions.
* The function must not get called again in the latter case.
*
* Called by x86_startup() before x86_init_board() gets called.
*
* The memory management is one of the earliest subsystems to be set up.
* The uart is already configured and usable.
* The interrupt handling is already set up and you may call x86_interrupt_handler_set().
*
* The function may return unaligned memory.
* In this case the begin of the region gets rounded up the the next page,
* and the end gets rounded down.
* The function may supply low memory regions, which will be ignored.
* The regions are expected to contain memory that lies inside the elf sections.
*/
bool x86_get_memory_region(uint64_t *start, uint64_t *len, unsigned long *cnt);
/**
* @brief Prints the last instruction's address
*/
static inline void cpu_print_last_instruction(void)
{
void *p;
__asm__("1: mov 1b, %0" : "=r" (p));
printf("%p\n", p);
}
#ifdef __cplusplus
}
#endif
#endif
/** @} */
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