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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2000 Erik Arjan Hendriks
* Copyright (C) 2000 Scyld Computing Corporation
* Copyright (C) 2001 University of California. LA-CC Number 01-67.
* Copyright (C) 2005 Nick.Barker9@btinternet.com
* Copyright (C) 2007 coresystems GmbH
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*
* LA-CC is the Los Alamos Control and Compliance Number, see also:
* http://supply.lanl.gov/property/customs/eximguide/default.shtml
*/
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <string.h>
#include <cpu/cpu.h>
#include <cpu/x86/lapic.h>
#include <cpu/x86/cache.h>
#include <arch/io.h>
#include <cbfs.h>
u32 VSA_vrRead(u16 classIndex);
void do_vsmbios(void);
#define VSA2_BUFFER 0x60000
#define VSA2_ENTRY_POINT 0x60020
#define VSA2_SIGNATURE 0x56534132 // 'VSA2' returned in EAX
#define SIGNATURE 0x03
/**
* TODO.
*
* The address arguments to this function are PHYSICAL ADDRESSES!
*
* @param smm TODO.
* @param sysm TODO.
*/
static void real_mode_switch_call_vsm(unsigned long smm, unsigned long sysm)
{
u16 entryHi = (VSA2_ENTRY_POINT & 0xffff0000) >> 4;
u16 entryLo = (VSA2_ENTRY_POINT & 0xffff);
__asm__ __volatile__(
/* Paranoia -- does ecx get saved? not sure. This is
* the easiest safe thing to do.
*/
" pushal \n"
/* Save the stack. */
" mov %%esp, __stack \n"
" jmp 1f \n"
"__stack: .long 0 \n"
"1:\n"
/* Get devfn into %%ecx. */
" movl %%esp, %%ebp \n"
/* Get the smm and sysm args into ecx and edx. */
" movl %0, %%ecx \n"
" movl %1, %%edx \n"
/* Load 'our' gdt. */
" lgdt %%cs:__mygdtaddr \n"
/* This configures CS properly for real mode. */
" ljmp $0x28, $__rms_16bit\n"
"__rms_16bit: \n"
" .code16 \n"
/* 16 bit code from here on... */
/* Load the segment registers with properly configured segment
* descriptors. They will retain these configurations (limits,
* writability, etc.) once protected mode is turned off.
*/
" mov $0x30, %%ax \n"
" mov %%ax, %%ds \n"
" mov %%ax, %%es \n"
" mov %%ax, %%fs \n"
" mov %%ax, %%gs \n"
" mov %%ax, %%ss \n"
/* Turn off protection (bit 0 in CR0). */
" movl %%cr0, %%eax \n"
" andl $0xFFFFFFFE, %%eax \n"
" movl %%eax, %%cr0 \n"
/* Now really going into real mode. */
" ljmp $0, $__rms_real\n"
"__rms_real: \n"
/* Put the stack at the end of page zero.
* That way we can easily share it between real and protected,
* since the 16-bit ESP at segment 0 will work for any case.
*/
/* Setup a stack. */
" mov $0x0, %%ax \n"
" mov %%ax, %%ss \n"
" movl $0x1000, %%eax \n"
" movl %%eax, %%esp \n"
/* Dump zeros in the other segregs. */
" mov %%ax, %%es \n"
/* FIXME: Big real mode for gs, fs? */
" mov %%ax, %%fs \n"
" mov %%ax, %%gs \n"
" mov $0x40, %%ax \n"
" mov %%ax, %%ds \n"
/* " mov %%cx, %%ax \n" */
" movl %0, %%ecx \n"
" movl %1, %%edx \n"
/* Call the VSA2 entry point address. */
" lcall %2, %3\n"
/* If we got here, just about done.
* Need to get back to protected mode.
*/
" movl %%cr0, %%eax \n"
" orl $0x0000001, %%eax\n" /* PE = 1 */
" movl %%eax, %%cr0 \n"
/* Now that we are in protected mode,
* jump to a 32 bit code segment.
*/
" data32 ljmp $0x10, $vsmrestart\n"
"vsmrestart:\n"
" .code32\n"
" movw $0x18, %%ax \n"
" mov %%ax, %%ds \n"
" mov %%ax, %%es \n"
" mov %%ax, %%fs \n"
" mov %%ax, %%gs \n"
" mov %%ax, %%ss \n"
/* Restore proper gdt. */
" lgdt %%cs:gdtarg \n"
".globl vsm_exit \n"
"vsm_exit: \n"
" mov __stack, %%esp \n"
" popal \n"::
"g" (smm), "g"(sysm), "g"(entryHi), "g"(entryLo)
);
}
__asm__(".text\n" "real_mode_switch_end:\n");
extern char real_mode_switch_end[];
/* andrei: Some VSA virtual register helpers: raw read and MSR read. */
u32 VSA_vrRead(u16 classIndex)
{
unsigned eax, ebx, ecx, edx;
asm volatile (
"movw $0x0AC1C, %%dx \n"
"orl $0x0FC530000, %%eax \n"
"outl %%eax, %%dx \n"
"addb $2, %%dl \n"
"inw %%dx, %%ax \n"
: "=a" (eax), "=b"(ebx), "=c"(ecx), "=d"(edx)
: "a"(classIndex)
);
return eax;
}
u32 VSA_msrRead(u32 msrAddr)
{
unsigned eax, ebx, ecx, edx;
asm volatile (
"movw $0x0AC1C, %%dx \n"
"movl $0x0FC530007, %%eax \n"
"outl %%eax, %%dx \n"
"addb $2, %%dl \n"
"inw %%dx, %%ax \n"
: "=a" (eax), "=b"(ebx), "=c"(ecx), "=d"(edx)
: "c"(msrAddr)
);
return eax;
}
void do_vsmbios(void)
{
unsigned char *buf;
int i;
printk_err( "do_vsmbios\n");
/* Clear VSM BIOS data area. */
for (i = 0x400; i < 0x500; i++)
*(volatile unsigned char *)i = 0;
if ((unsigned int)cbfs_load_stage("vsa") != VSA2_ENTRY_POINT) {
printk_err("do_vsmbios: Failed to load VSA.\n");
}
buf = VSA2_BUFFER;
printk_debug("buf[0x20] signature is %x:%x:%x:%x\n",
buf[0x20], buf[0x21], buf[0x22], buf[0x23]);
/* Check for POST code at start of vsainit.bin. If you don't see it,
* don't bother.
*/
if ((buf[0x20] != 0xb0) || (buf[0x21] != 0x10) ||
(buf[0x22] != 0xe6) || (buf[0x23] != 0x80)) {
die("FATAL: no vsainit.bin signature, skipping!\n");
}
/* ecx gets smm, edx gets sysm. */
printk_err("Call real_mode_switch_call_vsm\n");
// real_mode_switch_call_vsm(MSR_GLIU0_SMM, MSR_GLIU0_SYSMEM);
/* Restart Timer 1. */
outb(0x56, 0x43);
outb(0x12, 0x41);
/* Check that VSA is running OK. */
if (VSA_vrRead(SIGNATURE) == VSA2_SIGNATURE)
printk_debug("do_vsmbios: VSA2 VR signature verified\n");
else
die("FATAL: VSA2 VR signature not valid, install failed!\n");
}
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