mirror of
https://github.com/fail0verflow/switch-coreboot.git
synced 2025-05-04 01:39:18 -04:00
2a605775a6
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@392 f3766cd6-281f-0410-b1cd-43a5c92072e9
100 lines
3.4 KiB
C
100 lines
3.4 KiB
C
/*
|
|
* This file is part of the LinuxBIOS project.
|
|
*
|
|
* Copyright (C) 2006 Indrek Kruusa <indrek.kruusa@artecdesign.ee>
|
|
* Copyright (C) 2006 Ronald G. Minnich <rminnich@gmail.com>
|
|
* Copyright (C) 2006 Stefan Reinauer <stepan@coresystems.de>
|
|
* Copyright (C) 2006 Andrei Birjukov <andrei.birjukov@artecdesign.ee>
|
|
* Copyright (C) 2007 Advanced Micro Devices, Inc.
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/* This is a test for the idea of a cpu device. There is only ever
|
|
* going to be one CPU device, the bootstrap processor or BP; other
|
|
* processors will go through a different path. on Geode it is
|
|
* really simple, so we start with that. Later, it gets harder.
|
|
*/
|
|
|
|
#include <console.h>
|
|
#include <string.h>
|
|
#include <device/device.h>
|
|
#include <lib.h>
|
|
#include <io.h>
|
|
#include <cpu.h>
|
|
|
|
/* TODO: better comment on vsm_end_post_smi, and define 0x05a2 down below */
|
|
/**
|
|
* This is a call to the VSM.
|
|
* We need to know what it does.
|
|
*/
|
|
static void vsm_end_post_smi(void)
|
|
{
|
|
__asm__ volatile ("push %ax\n"
|
|
"mov $0x5000, %ax\n"
|
|
".byte 0x0f, 0x38\n" "pop %ax\n");
|
|
}
|
|
|
|
/**
|
|
* The very last steps in lx init. Turn on caching,
|
|
* tell vsm that we are done. Turn A20 back on in
|
|
* case VSM turned it off.
|
|
* @param dev struct device pointer
|
|
*/
|
|
static void lx_init(struct device *dev)
|
|
{
|
|
printk(BIOS_SPEW, "lx_init\n");
|
|
|
|
/* Turn on caching if we haven't already */
|
|
enable_cache();
|
|
|
|
// do VSA late init
|
|
vsm_end_post_smi();
|
|
|
|
// Set gate A20 (legacy vsm disables it in late init)
|
|
printk(BIOS_SPEW, "A20 (0x92): %d\n", inb(0x92));
|
|
outb(0x02, 0x92);
|
|
printk(BIOS_SPEW, "A20 (0x92): %d\n", inb(0x92));
|
|
|
|
printk(BIOS_SPEW, "CPU lx_init DONE\n");
|
|
};
|
|
|
|
/* The only operations currently set up are the phase 6. We might,
|
|
* however, set up an op in phase3_scan to get the cpuinfo into a
|
|
* struct for all to see. On SMP, it would not be hard to have
|
|
* phase3 scan set up an array of such structs. Further, for systems
|
|
* which have multiple types of CPUs, you can compile in multiple CPU
|
|
* files and use the device id, at scan time, to pick which one is
|
|
* used. There is a lot of flexibility here!
|
|
*/
|
|
struct device_operations geodelx_cpuops = {
|
|
.constructor = default_device_constructor,
|
|
.phase3_scan = NULL,
|
|
.phase6_init = lx_init,
|
|
};
|
|
|
|
/* This is a constructor for a cpu. the PCI id works for now.
|
|
* Later, we might need to change it to use a different phase3 scan,
|
|
* and match on a cpu id. However, CPU IDs are known to be kind
|
|
* of weird, depending on date manufactured they can be all
|
|
* over the place (the Geode alone has had 3 vendors!) so
|
|
* we will have to be careful
|
|
*/
|
|
struct constructor geodelx_constructors[] = {
|
|
{.id = {.type = DEVICE_ID_PCI,
|
|
.u = {.pci = {.vendor = X86_VENDOR_AMD,.device = 0x05A2}}},
|
|
.ops = &geodelx_cpuops},
|
|
{.ops = 0},
|
|
};
|