These changes implement car in qemu. The implementation is in several

ways superior to v3, while lacking its completeness. But, one nice 
thing: no more included .S or .c files. It's all separate compilation. 
That should allow our Makefiles to work much better.

Note that the current non-CAR implementation is the default and 
continues to work (tested FILO boot to Linux on both CAR and non-CAR).

Index: src/mainboard/emulation/qemu-x86/Config.lb
Change this to be sensitive to USE_DCACHE_RAM. All settings etc. that 
depend on this variable are grouped in one if, and the other parts 
(romcc etc.) are in the else. This change is a model of how we should be 
able to do other motherboards.

Index: src/mainboard/emulation/qemu-x86/Options.lb
add needed options. 

Index: src/mainboard/emulation/qemu-x86/failover.c
remove code inclusion from this not-yet-used file. 

Index: src/mainboard/emulation/qemu-x86/rom.c
This is the entry point for the rom-based code. Called stage1.c in v3. 

Index: src/lib/Config.lb
change initobject to a .o from a .c; this fixed a build problem. 

Index: src/pc80/serial.c
make uart_init non-static. 

Index: src/pc80/Config.lb
add initobject

Index: src/arch/i386/init/entry.S
Entry point. Unify a bunch of files that were fiddly lttle includes. From v3. 

Index: src/arch/i386/init/ldscript.ld
new file. The goal is to hang all init changes for CAR here, to minimize other changes to any
other ldscript. Besides, putting this in init makes sense; entry and car are manage init. 

Index: src/arch/i386/init/car.S
generic i386 car code from v3. 

Index: src/arch/i386/init/ldscript_fallback_cbfs.lb
Fix what looks like a bug: this was not including the init.text section. 

Index: targets/emulation/qemu-x86/Config.lb
push up the console loglevel. qemu is for debugging so we might as well 
get all the debugging we can. 

Index: targets/emulation/qemu-x86/Config-car.lb
For CAR bullds. 

Signed-off-by: Ronald G. minnich <rminnich@gmail.com>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>




git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4357 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

4 files changed, 554 insertions, 0 deletions

diff --git a/src/arch/i386/init/car.S b/src/arch/i386/init/car.S
new file mode 100644
index 0000000000..94ffc648c5
--- /dev/null
+++ b/src/arch/i386/init/car.S
@@ -0,0 +1,357 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2000,2007 Ronald G. Minnich <rminnich@gmail.com>
+ * Copyright (C) 2005 Eswar Nallusamy, LANL
+ * Copyright (C) 2005 Tyan
+ * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
+ * Copyright (C) 2007 coresystems GmbH
+ * (Written by Stefan Reinauer <stepan@coresystems.de> for coresystems GmbH)
+ * Copyright (C) 2008 Carl-Daniel Hailfinger
+ *
+ * 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
+ */
+
+/* Init code - Switch CPU to protected mode and enable Cache-as-Ram (CAR). */
+
+#include <arch/intel.h>
+
+#define ROM_CODE_SEG 0x08
+#define ROM_DATA_SEG 0x10
+
+#define CACHE_RAM_CODE_SEG 0x18
+#define CACHE_RAM_DATA_SEG 0x20
+
+	/* When we come here we are in protected mode. We expand the stack
+	 * and copy the data segment from ROM to the memory.
+	 *
+	 * After that, we call the chipset bootstrap routine that
+	 * does what is left of the chipset initialization.
+	 *
+	 * NOTE: Aligned to 4 so that we are sure that the prefetch
+	 * cache will be reloaded.
+	 */
+	.section .rom.text
+	.align  4
+	.globl protected_stage0
+protected_stage0:
+	lgdt	%cs:gdtptr
+	ljmp	$ROM_CODE_SEG, $__protected_stage0
+
+.globl __protected_stage0
+__protected_stage0:
+	/* Save the BIST result. */
+	movl	%eax, %ebp
+
+	intel_chip_post_macro(0x01)
+
+	movw	$ROM_DATA_SEG, %ax
+	movw	%ax, %ds
+	movw	%ax, %es
+	movw	%ax, %ss
+	movw	%ax, %fs
+	movw	%ax, %gs
+
+	/* Restore the BIST value to %eax. */
+	movl	%ebp, %eax
+
+.align 4
+
+/* disable HyperThreading is done by eswar
+ * the other is very similar to the AMD CAR, except remove amd specific msr
+ */
+
+#define CacheSize DCACHE_RAM_SIZE
+#define CacheBase DCACHE_RAM_BASE
+
+#include <cpu/x86/mtrr.h>
+
+	/* Save the BIST result */
+	movl    %eax, %ebp
+
+CacheAsRam:
+	/* Check whether the processor has HT capability */
+	movl	$01, %eax
+	cpuid
+	btl	$28, %edx
+	jnc	NotHtProcessor
+	bswapl	%ebx
+	cmpb	$01, %bh
+	jbe	NotHtProcessor
+
+	/* It is a HT processor; Send SIPI to the other logical processor
+	 * within this processor so that the CAR related common system
+	 * registers are programmed accordingly
+	 */
+
+	/* Use some register that is common to both logical processors
+	 * as semaphore. Refer Appendix B, Vol.3
+	 */
+
+	xorl	%eax, %eax
+	xorl	%edx, %edx
+	movl	$0x250, %ecx
+	wrmsr
+
+	/* Figure out the logical AP's APIC ID; the following logic will work
+	 * only for processors with 2 threads.
+	 *
+	 * Refer to Vol 3. Table 7-1 for details about this logic
+	 */
+	movl	$0xFEE00020, %esi
+	movl	(%esi), %ebx
+	andl	$0xFF000000, %ebx
+	bswapl	%ebx
+	btl	$0, %ebx
+	jnc	LogicalAP0
+	andb	$0xFE, %bl
+	jmp	SendSIPI
+LogicalAP0:
+	orb	$0x01, %bl
+SendSIPI:
+	bswapl	%ebx  /* ebx - logical AP's APIC ID */
+
+	/* Fill up the IPI command registers in the Local APIC mapped to
+	 * default address and issue SIPI to the other logical processor
+	 * within this processor die.
+	 */
+
+RetrySIPI:
+	movl	%ebx, %eax
+	movl	$0xFEE00310, %esi
+	movl	%eax, (%esi)
+
+	/* SIPI vector - F900:0000 */
+	movl	$0x000006F9, %eax
+	movl	$0xFEE00300, %esi
+	movl	%eax, (%esi)
+
+	movl	$0x30, %ecx
+SIPIDelay:
+	pause
+	decl	%ecx
+	jnz	SIPIDelay
+
+	movl	(%esi), %eax
+	andl	$0x00001000, %eax
+	jnz	RetrySIPI
+
+	/* Wait for the Logical AP to complete initialization */
+LogicalAPSIPINotdone:
+	movl	$0x250, %ecx
+	rdmsr
+	orl	%eax, %eax
+	jz	LogicalAPSIPINotdone
+
+
+
+NotHtProcessor:
+	/* Set the default memory type and enable fixed and variable MTRRs */
+	movl	$MTRRdefType_MSR, %ecx
+	xorl	%edx, %edx
+	/* Enable Variable and Fixed MTRRs */
+	movl	$0x00000c00, %eax
+	wrmsr
+
+	/* Clear all MTRRs */
+	xorl	%edx, %edx
+	movl	$fixed_mtrr_msr, %esi
+
+clear_fixed_var_mtrr:
+	lodsl	(%esi), %eax
+	testl	%eax, %eax
+	jz	clear_fixed_var_mtrr_out
+
+	movl	%eax, %ecx
+	xorl	%eax, %eax
+	wrmsr
+
+	jmp	clear_fixed_var_mtrr
+clear_fixed_var_mtrr_out:
+
+/* 0x06 is the WB IO type for a given 4k segment.
+ * segs is the number of 4k segments in the area of the particular
+ *   register we want to use for CAR.
+ * reg is the register where the IO type should be stored.
+ */
+.macro extractmask segs, reg
+.if \segs <= 0
+	/* The xorl here is superfluous because at the point of first execution
+	 * of this macro, %eax and %edx are cleared. Later invocations of this
+	 * macro will have a monotonically increasing segs parameter.
+	 */
+	xorl \reg, \reg
+.elseif \segs == 1
+	movl $0x06000000, \reg /* WB IO type */
+.elseif \segs == 2
+	movl $0x06060000, \reg /* WB IO type */
+.elseif \segs == 3
+	movl $0x06060600, \reg /* WB IO type */
+.elseif \segs >= 4
+	movl $0x06060606, \reg /* WB IO type */
+.endif
+.endm
+
+/* size is the cache size in bytes we want to use for CAR.
+ * windowoffset is the 32k-aligned window into CAR size
+ */
+.macro simplemask carsize, windowoffset
+/* DO NOT CHANGE THE FORMATTING of the two lines below! Whitespace is
+ * interpreted as an argument delimiter by some versions of GNU as. */
+	extractmask (((\carsize-\windowoffset)/0x1000)-4), %eax
+	extractmask (((\carsize-\windowoffset)/0x1000)), %edx
+.endm
+
+#if CacheSize > 0x10000
+#error Invalid CAR size, must be at most 64k.
+#endif
+#if CacheSize < 0x1000
+#error Invalid CAR size, must be at least 4k. This is a processor limitation.
+#endif
+#if (CacheSize & (0x1000 - 1))
+#error Invalid CAR size, is not a multiple of 4k. This is a processor limitation.
+#endif
+
+#if CacheSize > 0x8000
+	/* enable caching for 32K-64K using fixed mtrr */
+	movl    $0x268, %ecx  /* fix4k_c0000*/
+	simplemask CacheSize, 0x8000
+	wrmsr
+#endif
+
+	/* enable caching for 0-32K using fixed mtrr */
+	movl    $0x269, %ecx  /* fix4k_c8000*/
+	simplemask CacheSize, 0
+	wrmsr
+
+#if defined(CONFIG_XIP_ROM_SIZE) && defined(CONFIG_XIP_ROM_BASE)
+	/* enable write base caching so we can do execute in place
+	 * on the flash rom.
+	 */
+	movl    $0x202, %ecx
+	xorl    %edx, %edx
+	movl    $(XIP_ROM_BASE | MTRR_TYPE_WRBACK), %eax
+	wrmsr
+
+	movl    $0x203, %ecx
+	movl    $0x0000000f, %edx
+	movl    $(~(XIP_ROM_SIZE - 1) | 0x800), %eax
+	wrmsr
+#endif /* XIP_ROM_SIZE && XIP_ROM_BASE */
+
+	/* enable cache */
+	movl    %cr0, %eax
+	andl    $0x9fffffff,%eax
+	movl    %eax, %cr0
+
+	/* Read the range with lodsl*/
+	movl    $CacheBase, %esi
+	cld
+	movl    $(CacheSize>>2), %ecx
+	rep     lodsl
+
+	/* Clear the range */
+	movl    $CacheBase, %edi
+	movl    $(CacheSize>>2), %ecx
+	xorl    %eax, %eax
+	rep     stosl
+
+
+	/* TODO: make this a config variable */
+#if CONFIG_CARTEST
+	/* check the cache as ram */
+	movl  $CacheBase, %esi
+	movl    $(CacheSize>>2), %ecx
+.xin1:
+	movl  %esi, %eax
+	movl  %eax, (%esi)
+	decl  %ecx
+	je      .xout1
+	add     $4, %esi
+	jmp     .xin1
+.xout1:
+
+	movl  $CacheBase, %esi
+//        movl    $(CacheSize>>2), %ecx
+	movl $4, %ecx
+.xin1x:
+	movl  %esi, %eax
+
+	movl    $0x4000, %edx
+	movb    %ah, %al
+.testx1:
+	outb %al, $0x80
+	decl    %edx
+	jnz .testx1
+	
+	movl  (%esi), %eax
+	cmpb 0xff, %al
+	je .xin2  /* dont show */
+
+	movl    $0x4000, %edx
+.testx2:
+	outb %al, $0x80
+	decl    %edx
+	jnz .testx2
+	
+.xin2:  decl     %ecx
+	je      .xout1x
+	add     $4, %esi
+	jmp     .xin1x
+.xout1x:
+
+#endif
+
+	movl	$(CacheBase+CacheSize-4), %eax
+	movl    %eax, %esp
+
+	/* Load a different set of data segments */
+	movw    $CACHE_RAM_DATA_SEG, %ax
+	movw    %ax, %ds
+	movw    %ax, %es
+	movw    %ax, %ss
+
+lout:
+	/* Store zero for the pointer to the global variables. */
+	pushl   $0
+
+	/* Restore the BIST result. */
+	movl	%ebp, %eax
+
+	/* We need to set ebp? No need. */
+	movl	%esp, %ebp
+
+	/* Third parameter: cpu #: 0 == BSP all other are APs.
+	 * 0 until SMP support is added.
+	 */
+	pushl	$0
+	/* Second parameter: init_detected */
+	/* Store zero for the unused init_detected parameter. */
+	pushl	$0
+	/* First parameter: bist */
+	pushl	%eax
+	call	main
+	/* We will not go back. */
+
+fixed_mtrr_msr:
+	.long	0x250, 0x258, 0x259
+	.long	0x268, 0x269, 0x26A
+	.long	0x26B, 0x26C, 0x26D
+	.long	0x26E, 0x26F
+var_mtrr_msr:
+	.long	0x200, 0x201, 0x202, 0x203
+	.long	0x204, 0x205, 0x206, 0x207
+	.long	0x208, 0x209, 0x20A, 0x20B
+	.long	0x20C, 0x20D, 0x20E, 0x20F
+	.long	0x000 /* NULL, end of table */
diff --git a/src/arch/i386/init/entry.S b/src/arch/i386/init/entry.S
new file mode 100644
index 0000000000..f091c84d1f
--- /dev/null
+++ b/src/arch/i386/init/entry.S
@@ -0,0 +1,156 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 1999 Ronald G. Minnich
+ *
+ * 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/rom_segs.h>
+	.code16
+	.globl _stage0
+_stage0:
+	cli
+
+	/* Save the BIST result. */
+	movl	%eax, %ebp;
+
+	/* thanks to kmliu@sis.com.tw for this TLB fix */
+	/* IMMEDIATELY invalidate the translation lookaside buffer (TLB) before
+	 * executing any further code. Even though paging is disabled we
+	 * could still get false address translations due to the TLB if we
+	 * didn't invalidate it.
+	 */
+	xorl	%eax, %eax
+	movl	%eax, %cr3	/* Invalidate TLB. */
+
+	/* Switch to protected mode. */
+
+	/* NOTE: With GNU assembler version 2.15.94.0.2.2 (i386-redhat-linux)
+	 * using BFD version 2.15.94.0.2.2 20041220 this works fine without all
+	 * the ld hackery and other things. So leave it as is with this comment.
+	 */
+
+	data32	lgdt %cs:gdtptr
+
+	movl	%cr0, %eax
+	andl	$0x7FFAFFD1, %eax /* PG, AM, WP, NE, TS, EM, MP = 0 */
+	orl	$0x60000001, %eax /* CD, NW, PE = 1 */
+	movl	%eax, %cr0
+
+	/* Restore BIST result. */
+	movl	%ebp, %eax
+
+	// port80_post(0x23)
+	/* Now we are in protected mode. Jump to a 32 bit code segment. */
+	data32	ljmp $ROM_CODE_SEG, $protected_stage0
+
+	/* I am leaving this weird jump in here in the event that future gas
+	 * bugs force it to be used.
+	 */
+	/* .byte 0x66 */
+	.code32
+	/* ljmp	$ROM_CODE_SEG, $protected_stage0 */
+
+	/* .code16 */
+	.align 4
+	.globl gdt16
+gdt16 = . - _stage0
+gdt16x:
+	.word	gdt16xend - gdt16x -1	/* Compute the table limit. */
+	.long	gdt16x
+	.word	0
+
+	/* selgdt 0x08, flat code segment */
+	.word	0xffff, 0x0000
+	.byte	0x00, 0x9b, 0xcf, 0x00
+
+	/* selgdt 0x10, flat data segment */
+	.word	0xffff, 0x0000
+	.byte	0x00, 0x93, 0xcf, 0x00
+gdt16xend:
+
+	/* From now on we are 32 bit. */
+	.code32
+
+	/* We have two gdts where we could have one. That is ok.
+	 *
+	 * Let's not worry about this -- optimizing gdt is pointless since
+	 * we're only in it for a little bit.
+	 *
+	 * Btw. note the trick below: The GDT points to ITSELF, and the first
+	 * good descriptor is at offset 8. So you word-align the table, and
+	 * then because you chose 8, you get a nice 64-bit aligned GDT entry,
+	 * which is good as this is the size of the entry.
+	 * Just in case you ever wonder why people do this.
+	 */
+	.align 4
+	.globl gdtptr
+	.globl gdt_limit
+gdt_limit = gdt_end - gdt - 1		/* Compute the table limit. */
+
+gdt:
+gdtptr:
+	.word	gdt_end - gdt -1	/* Compute the table limit. */
+	.long	gdt			/* We know the offset. */
+	.word	0
+
+	/* selgdt 0x08, flat code segment */
+	.word	0xffff, 0x0000
+	.byte	0x00, 0x9b, 0xcf, 0x00
+
+	/* selgdt 0x10, flat data segment */
+	.word	0xffff, 0x0000
+	.byte	0x00, 0x93, 0xcf, 0x00
+
+	/* selgdt 0x18, flat code segment for CAR */
+	.word	0xffff, 0x0000
+	.byte	0x00, 0x9b, 0xcf, 0x00
+
+	/* selgdt 0x20, flat data segment for CAR */
+	.word	0xffff, 0x0000
+	.byte	0x00, 0x93, 0xcf, 0x00
+gdt_end:
+
+/* Reset vector. */
+
+/*
+ * RVECTOR: Size of reset vector, default is 0x10.
+ * RESRVED: Size of vpd code, default is 0xf0.
+ * BOOTBLK: Size of bootblock code, default is 0x1f00 (8k-256b).
+ */
+
+SEGMENT_SIZE = 0x10000
+RVECTOR      = 0x00010
+
+/* Due to YET ANOTHER BUG in GNU bintools, you can NOT have a code16 here.
+ * I think we should leave it this way forever, as the bugs come and
+ * go -- and come again.
+ *
+ *	.code16
+ *	.section ".rom.text"
+ */
+.section ".reset", "ax"
+	.globl _resetjump
+_resetjump:
+	/* GNU bintools bugs again. This jumps to stage0 - 2. Sigh. */
+	/* jmp _stage0 */
+	.byte	0xe9
+	.int	_stage0 - ( . + 2 )
+
+	/* Note: The above jump is hand coded to work around bugs in binutils.
+	 * 5 bytes are used for a 3 byte instruction. This works because x86
+	 * is little endian and allows us to use supported 32 bit relocations
+	 * instead of the weird 16 bit relocations that binutils does not
+	 * handle consistenly between versions because they are used so rarely.
+	 */
diff --git a/src/arch/i386/init/ldscript.ld b/src/arch/i386/init/ldscript.ld
new file mode 100644
index 0000000000..e56f644034
--- /dev/null
+++ b/src/arch/i386/init/ldscript.ld
@@ -0,0 +1,40 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007 Ronald G. Minnich <rminnich@gmail.com>
+ *
+ * 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
+ */
+
+TARGET(binary)
+SECTIONS
+{
+	/DISCARD/ : {
+		*(.comment)
+		*(.note.*)
+		*(.note)
+	}
+}
+
+SECTIONS {
+	_ROMTOP = 0xfffffff0;
+	. = _ROMTOP;
+	.resetvector . : {
+		*(.reset)
+                . = 15 ;
+                BYTE(0x00);
+	} 
+}
+
diff --git a/src/arch/i386/init/ldscript_fallback_cbfs.lb b/src/arch/i386/init/ldscript_fallback_cbfs.lb
index d1b56ce3b2..52274d1356 100644
--- a/src/arch/i386/init/ldscript_fallback_cbfs.lb
+++ b/src/arch/i386/init/ldscript_fallback_cbfs.lb
@@ -46,6 +46,7 @@ SECTIONS
 		*(.rom.text);
 		*(.rom.data);
 		*(.init.rodata.*);
+		*(.init.text);
 		*(.rodata.*);
 		*(.rom.data.*);
 		. = ALIGN(16);