125 lines
4.4 KiB
C
125 lines
4.4 KiB
C
/*
|
|
* Copyright (C) 2015, Intel Corporation. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* 3. Neither the name of the copyright holder nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
|
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "cpu.h"
|
|
#include "gdt.h"
|
|
#include "helpers.h"
|
|
#include "idt.h"
|
|
#include "interrupt.h"
|
|
#include "irq.h"
|
|
#include "stacks.h"
|
|
|
|
static void
|
|
double_fault_handler(struct interrupt_context context)
|
|
{
|
|
halt();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/* The OS has switched to its own segment descriptors. When multi-segment
|
|
* protection domain support is enabled, this routine runs with the
|
|
* necessary address translations configured to invoke other routines that
|
|
* require those translations to be in place. However, the protection domain
|
|
* support, if enabled, has not yet been fully activated.
|
|
*/
|
|
static void
|
|
boot_stage1(void)
|
|
{
|
|
idt_init();
|
|
|
|
/* Set an interrupt handler for Double Fault exception. This way, we avoid
|
|
* the system to triple fault, leaving no trace about what happened.
|
|
*/
|
|
SET_EXCEPTION_HANDLER(8, 1, double_fault_handler);
|
|
|
|
/* Initialize protection domain support, if enabled */
|
|
prot_domains_init();
|
|
|
|
prot_domains_leave_boot_stage1();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int main(void);
|
|
/* This routine runs with the initial, flat address space, even if protection
|
|
* domain support is enabled. The goal behind the design of this routine is to
|
|
* keep it as short as possible, since it is unable to directly reference data
|
|
* and invoke functions that are intended to be accessible later after the
|
|
* system has booted when a multi-segment protection domain model is in use.
|
|
*/
|
|
void
|
|
cpu_boot_stage0(void)
|
|
{
|
|
/* Reserve three stack slots for return addresses */
|
|
uintptr_t top_of_stack = STACKS_INIT_TOP;
|
|
|
|
#if X86_CONF_PROT_DOMAINS != X86_CONF_PROT_DOMAINS__NONE
|
|
uintptr_t *top_of_stack_ptr =
|
|
(uintptr_t *)DATA_OFF_TO_PHYS_ADDR(top_of_stack);
|
|
|
|
top_of_stack_ptr[0] = (uintptr_t)prot_domains_launch_kernel;
|
|
top_of_stack_ptr[1] = (uintptr_t)prot_domains_launch_app;
|
|
#endif
|
|
|
|
/* Perform common GDT initialization */
|
|
gdt_init();
|
|
|
|
/* Switch all data segment registers to the newly-initialized flat data
|
|
* descriptor.
|
|
*/
|
|
__asm__(
|
|
"mov %0, %%ds\n\t"
|
|
"mov %0, %%es\n\t"
|
|
"mov %0, %%fs\n\t"
|
|
"mov %0, %%gs\n\t"
|
|
:
|
|
: "r" (GDT_SEL_DATA_FLAT)
|
|
);
|
|
|
|
/**
|
|
* Perform specific GDT initialization tasks for the protection domain
|
|
* implementation that is enabled, if any.
|
|
*/
|
|
prot_domains_gdt_init();
|
|
|
|
/* Do not pass memory operands to the asm block below, since it is
|
|
* switching from the flat address space to a multi-segment address space
|
|
* model if such a model is used by the enabled protection domain
|
|
* implementation, if any.
|
|
*/
|
|
__asm__(
|
|
"mov %[_ss_], %%ss\n\t"
|
|
"mov %[_esp_], %%esp\n\t"
|
|
"ljmp %[_cs_], %[_stage1_]\n\t"
|
|
:
|
|
: [_ss_] "r" (GDT_SEL_STK_EXC),
|
|
[_esp_] "r" (top_of_stack),
|
|
[_cs_] "i" ((uint16_t)GDT_SEL_CODE_EXC),
|
|
[_stage1_] "i" (boot_stage1)
|
|
);
|
|
}
|