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786 |
skrzyp |
#ifndef CYGONCE_HAL_PLATFORM_INC
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#define CYGONCE_HAL_PLATFORM_INC
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##=============================================================================
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##
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## platform.inc
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##
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## PC platform support
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##
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##=============================================================================
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## ####ECOSGPLCOPYRIGHTBEGIN####
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## -------------------------------------------
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## This file is part of eCos, the Embedded Configurable Operating System.
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## Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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##
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## eCos is free software; you can redistribute it and/or modify it under
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## the terms of the GNU General Public License as published by the Free
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## Software Foundation; either version 2 or (at your option) any later
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## version.
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##
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## eCos is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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## for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with eCos; if not, write to the Free Software Foundation, Inc.,
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## As a special exception, if other files instantiate templates or use
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## macros or inline functions from this file, or you compile this file
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## and link it with other works to produce a work based on this file,
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## this file does not by itself cause the resulting work to be covered by
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## the GNU General Public License. However the source code for this file
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## must still be made available in accordance with section (3) of the GNU
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## General Public License v2.
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##
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## This exception does not invalidate any other reasons why a work based
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## on this file might be covered by the GNU General Public License.
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## -------------------------------------------
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## ####ECOSGPLCOPYRIGHTEND####
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##=============================================================================
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#######DESCRIPTIONBEGIN####
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##
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## Author(s): jskov
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## Contributors:jskov, pjo, nickg
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## Date: 1999-01-07
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## Purpose: PC platform support
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## Description: This file contains any PC specific assembler macros needed to
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## run eCos on a standard i386 PC.
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##
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##
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######DESCRIPTIONEND####
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##
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##=============================================================================
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#include
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#include
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##=============================================================================
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## CPU initialization
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#ifndef CYGPKG_HAL_I386_CPU_INIT_DEFINED
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#define CYGPKG_HAL_I386_CPU_INIT_DEFINED
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##=============================================================================
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## ROM and GRUB startup
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##
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## Although these two startup types are, on the face of it, very different,
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## the actual work that needs to be done here for them both is much the same.
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## In both cases the system has been initialized in real mode and the transition
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## to 32 bit protected mode has been done. Here all we need to do is set up
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## our own GDT and IDT, reload the segment registers and proceed.
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#if defined(CYG_HAL_STARTUP_ROM) || defined(CYG_HAL_STARTUP_GRUB)
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.macro hal_cpu_init
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hal_cpu_init_start:
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# Disable interrupt handling.
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cli
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# Make a GDT pointer in location 0 and load new GDTR
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movw $(gdtEnd - gdtStart),%ax
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movw %ax,0
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leal gdtStart,%eax
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movl %eax,2
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lgdt 0
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# Make an IDT pointer in location 0 and load new LDTR
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movw $0x77F,%ax
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movw %ax,0
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leal idtStart,%eax
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movl %eax,2
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lidt 0
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# Jump long to reload CS
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jmpl $8,$3f
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.align 4, 0xFF
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gdtStart:
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/* Selector 0x00 == invalid. */
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.word 0x0000
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.word 0x0000
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.byte 0x00
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.byte 0x00
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.byte 0x00
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.byte 0x00
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/* Selector 0x08 == code. */
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.word 0xFFFF
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.word 0x0000
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.byte 0x00
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.byte 0x9B
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.byte 0xCF
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.byte 0x00
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/* Selector 0x10 == data. */
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.word 0xFFFF
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.word 0x0000
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.byte 0x00
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.byte 0x93
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.byte 0xCF
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.byte 0x00
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/* Selector 0x18 == shorter code: faults any code
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* access 0xF0000000-0xFFFFFFFF.
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*/
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.word 0xFFFF
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.word 0x0000
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.byte 0x00
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.byte 0x9B
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.byte 0xC7
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.byte 0x00
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/* Selector 0x20 == data; faults any access 0xF0000000-0xFFFFFFFF. */
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.word 0xFFFF
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.word 0x0000
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.byte 0x00
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.byte 0x93
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.byte 0xC7
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.byte 0x00
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.align 4, 0xFF
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gdtEnd:
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#if defined(CYG_HAL_STARTUP_GRUB)
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# Multiboot header -- this must be in the first 8k
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# of the image file.
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#define GRUB_MAGIC 0x1BADB002 /* Magic number */
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#define GRUB_FLAGS 0x00000000 /* Flags */
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.align 4, 0xFF
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.long GRUB_MAGIC
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.long GRUB_FLAGS
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.long 0-GRUB_MAGIC-GRUB_FLAGS /* Checksum */
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#endif
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3:
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# Set up data selectors
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movw $0x10, %ax
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %fs
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movw %ax, %gs
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movw %ax, %ss
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# Set up SP
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movl $__interrupt_stack,%esp
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/* Reset the flags register. */
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push $0
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popf
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#if defined(CYG_HAL_STARTUP_GRUB)
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# Save the multiboot info passed in %EBX away into a
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# global variable for later use.
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.data
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.global hal_multiboot_info
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hal_multiboot_info:
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.long 0
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.text
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movl %ebx,hal_multiboot_info
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#endif
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hal_cpu_init_end:
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nop
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.endm
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#endif
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##=============================================================================
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## RAM startup
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#ifdef CYG_HAL_STARTUP_RAM
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.macro hal_cpu_init
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.endm
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#endif /* CYG_HAL_STARTUP_RAM */
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#endif // CYGPKG_HAL_I386_CPU_INIT_DEFINED
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##=============================================================================
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## IDT support
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.macro set_IDT_entry idx,addr
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pushl $(idtStart+8*\idx)
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pushl $\addr
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.extern cyg_hal_pc_set_idt_entry
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call cyg_hal_pc_set_idt_entry
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addl $8,%esp
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.endm
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.macro hal_idt_init
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.text
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hal_idt_init:
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set_IDT_entry 0, hal_pc_exception_0
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set_IDT_entry 1, hal_pc_exception_1
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set_IDT_entry 2, hal_pc_exception_2
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set_IDT_entry 3, hal_pc_exception_3
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set_IDT_entry 4, hal_pc_exception_4
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set_IDT_entry 5, hal_pc_exception_5
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set_IDT_entry 6, hal_pc_exception_6
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set_IDT_entry 7, hal_pc_exception_7
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set_IDT_entry 8, hal_pc_exception_8
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set_IDT_entry 9, hal_pc_exception_9
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set_IDT_entry 10, hal_pc_exception_10
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set_IDT_entry 11, hal_pc_exception_11
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set_IDT_entry 12, hal_pc_exception_12
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set_IDT_entry 13, hal_pc_exception_13
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set_IDT_entry 14, hal_pc_exception_14
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set_IDT_entry 15, hal_pc_exception_15
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set_IDT_entry 16, hal_pc_exception_16
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set_IDT_entry 17, hal_pc_exception_17
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set_IDT_entry 18, hal_pc_exception_18
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set_IDT_entry 19, hal_pc_exception_19
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set_IDT_entry 20, hal_pc_exception_20
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set_IDT_entry 21, hal_pc_exception_21
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set_IDT_entry 22, hal_pc_exception_22
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set_IDT_entry 23, hal_pc_exception_23
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set_IDT_entry 24, hal_pc_exception_24
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set_IDT_entry 25, hal_pc_exception_25
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set_IDT_entry 26, hal_pc_exception_26
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set_IDT_entry 27, hal_pc_exception_27
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set_IDT_entry 28, hal_pc_exception_28
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set_IDT_entry 29, hal_pc_exception_29
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set_IDT_entry 30, hal_pc_exception_30
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set_IDT_entry 31, hal_pc_exception_31
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set_IDT_entry 32, hal_pc_irq_32
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set_IDT_entry 33, hal_pc_irq_33
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set_IDT_entry 34, hal_pc_irq_34
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set_IDT_entry 35, hal_pc_irq_35
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set_IDT_entry 36, hal_pc_irq_36
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set_IDT_entry 37, hal_pc_irq_37
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set_IDT_entry 38, hal_pc_irq_38
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set_IDT_entry 39, hal_pc_irq_39
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set_IDT_entry 40, hal_pc_irq_40
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set_IDT_entry 41, hal_pc_irq_41
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set_IDT_entry 42, hal_pc_irq_42
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set_IDT_entry 43, hal_pc_irq_43
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set_IDT_entry 44, hal_pc_irq_44
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set_IDT_entry 45, hal_pc_irq_45
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set_IDT_entry 46, hal_pc_irq_46
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set_IDT_entry 47, hal_pc_irq_47
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#ifdef CYGPKG_HAL_SMP_SUPPORT
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set_IDT_entry 48, hal_pc_irq_48
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set_IDT_entry 49, hal_pc_irq_49
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set_IDT_entry 50, hal_pc_irq_50
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set_IDT_entry 51, hal_pc_irq_51
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set_IDT_entry 52, hal_pc_irq_52
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set_IDT_entry 53, hal_pc_irq_53
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set_IDT_entry 54, hal_pc_irq_54
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set_IDT_entry 55, hal_pc_irq_55
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set_IDT_entry 56, hal_pc_irq_56
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set_IDT_entry 57, hal_pc_irq_57
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set_IDT_entry 58, hal_pc_irq_58
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set_IDT_entry 59, hal_pc_irq_59
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set_IDT_entry 60, hal_pc_irq_60
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set_IDT_entry 61, hal_pc_irq_61
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set_IDT_entry 62, hal_pc_irq_62
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set_IDT_entry 63, hal_pc_irq_63
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set_IDT_entry 64, hal_pc_irq_64
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set_IDT_entry 65, hal_pc_irq_65
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set_IDT_entry 66, hal_pc_irq_66
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set_IDT_entry 67, hal_pc_irq_67
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#endif
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.endm
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##=============================================================================
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#endif // ifndef CYGONCE_HAL_PLATFORM_INC
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## end of platform.inc
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