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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2008 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; version 2 of
* the License.
*
* 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
*/
#include <arch/asm.h>
#include "../../../../src/northbridge/intel/i945/ich7.h"
#undef DEBUG_SMM_RELOCATION
//#define DEBUG_SMM_RELOCATION
#define LAPIC_ID 0xfee00020
.global smm_relocation_start
.global smm_relocation_end
/* initially SMM is some sort of real mode. */
.code16
/**
* This trampoline code relocates SMBASE to 0xa0000 - ( lapicid * 0x400 )
*
* Why 0x400? It is a safe value to cover the save state area per CPU. On
* current AMD CPUs this area is _documented_ to be 0x200 bytes. On Intel
* Core 2 CPUs the _documented_ parts of the save state area is 48 bytes
* bigger, effectively sizing our data structures 0x300 bytes.
*
* LAPICID SMBASE SMM Entry SAVE STATE
* 0 0xa0000 0xa8000 0xafd00
* 1 0x9fc00 0xa7c00 0xaf900
* 2 0x9f800 0xa7800 0xaf500
* 3 0x9f400 0xa7400 0xaf100
* 4 0x9f000 0xa7000 0xaed00
* 5 0x9ec00 0xa6c00 0xae900
* 6 0x9e800 0xa6800 0xae500
* 7 0x9e400 0xa6400 0xae100
* 8 0x9e000 0xa6000 0xadd00
* 9 0x9dc00 0xa5c00 0xad900
* 10 0x9d800 0xa5800 0xad500
* 11 0x9d400 0xa5400 0xad100
* 12 0x9d000 0xa5000 0xacd00
* 13 0x9cc00 0xa4c00 0xac900
* 14 0x9c800 0xa4800 0xac500
* 15 0x9c400 0xa4400 0xac100
* . . . .
* . . . .
* . . . .
* 31 0x98400 0xa0400 0xa8100
*
* With 32 cores, the SMM handler would need to fit between
* 0xa0000-0xa0400 and the stub plus stack would need to go
* at 0xa8000-0xa8100 (example for core 0). That is not enough.
*
* This means we're basically limited to 16 cpu cores before
* we need to use the TSEG/HSEG for the actual SMM handler plus stack.
* When we exceed 32 cores, we also need to put SMBASE to TSEG/HSEG.
*
* If we figure out the documented values above are safe to use,
* we could pack the structure above even more, so we could use the
* scheme to pack save state areas for 63 AMD CPUs or 58 Intel CPUs
* in the ASEG.
*
* Note: Some versions of Pentium M need their SMBASE aligned to 32k.
* On those the above only works for up to 2 cores. But for now we only
* care fore Core (2) Duo/Solo
*
*/
smm_relocation_start:
/* Check revision to see if AMD64 style SMM_BASE
* Intel Core Solo/Duo: 0x30007
* Intel Core2 Solo/Duo: 0x30100
* AMD64: 0x3XX64
* This check does not make much sense, unless someone ports
* SMI handling to AMD64 CPUs.
*/
mov $0x38000 + 0x7efc, %ebx
addr32 mov (%ebx), %al
cmp $0x64, %al
je 1f
mov $0x38000 + 0x7ef8, %ebx
jmp smm_relocate
1:
mov $0x38000 + 0x7f00, %ebx
smm_relocate:
/* Get this CPU's LAPIC ID */
movl $LAPIC_ID, %esi
addr32 movl (%esi), %ecx
shr $24, %ecx
/* calculate offset by multiplying the
* apic ID by 1024 (0x400)
*/
movl %ecx, %edx
shl $10, %edx
movl $0xa0000, %eax
subl %edx, %eax /* subtract offset, see above */
addr32 movl %eax, (%ebx)
/* The next section of code is hardware specific */
/* Clear SMI status */
movw $(DEFAULT_PMBASE + 0x34), %dx
inw %dx, %ax
outw %ax, %dx
/* Clear PM1 status */
movw $(DEFAULT_PMBASE + 0x00), %dx
inw %dx, %ax
outw %ax, %dx
/* Set EOS bit so other SMIs can occur */
movw $(DEFAULT_PMBASE + 0x30), %dx
inl %dx, %eax
orl $(1 << 1), %eax
outl %eax, %dx
/* End of hardware specific section. */
#ifdef DEBUG_SMM_RELOCATION
/* print [SMM-x] so we can determine if CPUx went to SMM */
movw $TTYS0_BASE, %dx
mov $'[', %al
outb %al, %dx
mov $'S', %al
outb %al, %dx
mov $'M', %al
outb %al, %dx
outb %al, %dx
movb $'-', %al
outb %al, %dx
/* calculate ascii of cpu number. More than 9 cores? -> FIXME */
movb %cl, %al
addb $'0', %al
outb %al, %dx
mov $']', %al
outb %al, %dx
mov $'\r', %al
outb %al, %dx
mov $'\n', %al
outb %al, %dx
#endif
/* That's it. return */
rsm
smm_relocation_end:
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