From 1bb68289001f95b49499ac8eb483a7a10e64cc52 Mon Sep 17 00:00:00 2001
From: Patrick Georgi <patrick.georgi@coresystems.de>
Date: Thu, 31 Dec 2009 12:56:53 +0000
Subject: romcc: - Set __PRE_RAM__ define per default - Properly handle ignored
 (#ifdef'd out) #include lines

amd/serengeti_cheetah_fam10:
- write ACPI files to $(obj) instead of the top dir (alias $(CURDIR))

tinybootblock:
- provide a way to define code that should be added to the bootblock,
  to map the entire ROM for use by CBFS

amd/model_fxx, amd/model_10xxx:
- add CONFIG_SSE

walkcbfs.S:
- eliminate the use of two registers, to make space for romcc to wiggle

amd/serengeti_cheetah_fam10:
- use the enable_rom framework. not entirely functional yet

Boot-tested on emulation/qemu-x86
Build-tested on amd/serengeti_cheetah_fam10
amd/serengeti_cheetah_fam10 fails in amdht/ somewhere, but builds

Signed-off-by: Patrick Georgi <patrick.georgi@coresystems.de>
Acked-by: Ronald G. Minnich <rminnich@gmail.com>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4994 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
---
 src/arch/i386/lib/walkcbfs.S | 42 +++++++++++++++++++++++-------------------
 1 file changed, 23 insertions(+), 19 deletions(-)

(limited to 'src/arch/i386/lib')

diff --git a/src/arch/i386/lib/walkcbfs.S b/src/arch/i386/lib/walkcbfs.S
index aba0453d1f..d043af5690 100644
--- a/src/arch/i386/lib/walkcbfs.S
+++ b/src/arch/i386/lib/walkcbfs.S
@@ -25,18 +25,9 @@
   input %esi: filename
   input %esp: return address (not pointer to return address!)
   output %eax: entry point
-  clobbers %ebx, %ecx, %edx, %edi, %ebp
+  clobbers %ebx, %ecx, %edi
 */
 walkcbfs:
-	mov %esi, %ebp /* stash away filename pointer */
-	mov $0, %edx
-1:
-	cmpb $0, (%edx,%esi)
-	jz 2f
-	add $1, %edx
-	jmp 1b
-2:
-	add $1, %edx
 	mov CBFS_HEADER_PTR, %eax
 	mov CBFS_HEADER_ROMSIZE(%eax), %ecx
 	bswap %ecx
@@ -45,15 +36,20 @@ walkcbfs:
 	mov CBFS_HEADER_OFFSET(%eax), %ecx
 	bswap %ecx
 	add %ecx, %ebx
-	mov CBFS_HEADER_ALIGN(%eax), %eax
-	bswap %eax
-	sub $1, %eax
 
+	/* determine filename length */
+	mov $0, %eax
+1:
+	cmpb $0, (%eax,%esi)
+	jz 2f
+	add $1, %eax
+	jmp 1b
+2:
+	add $1, %eax
 walker:
-	mov %ebp, %esi
 	mov %ebx, %edi
 	add $CBFS_FILE_STRUCTSIZE, %edi /* edi = address of first byte after struct cbfs_file */
-	mov %edx, %ecx
+	mov %eax, %ecx
 	repe cmpsb
 	# zero flag set if strings are equal
 	jnz tryharder
@@ -67,21 +63,29 @@ walker:
 	jmp *%esp
 
 tryharder:
+	sub %ebx, %edi /* edi = # of walked bytes */
+	sub %edi, %esi /* esi = start of filename */
+
+	/* ebx = ecx = (current+offset+len+ALIGN-1) & ~(ALIGN-1) */
 	mov CBFS_FILE_OFFSET(%ebx), %ecx
 	bswap %ecx
 	add %ebx, %ecx
 	mov CBFS_FILE_LEN(%ebx), %edi
 	bswap %edi
 	add %edi, %ecx
-	add %eax, %ecx
-	mov %eax, %edi
+	mov CBFS_HEADER_PTR, %ebx
+	mov CBFS_HEADER_ALIGN(%ebx), %ebx
+	bswap %ebx
+	sub $1, %ebx
+	add %ebx, %ecx
+	mov %ebx, %edi
 	not %edi
 	and %edi, %ecx
 	mov %ecx, %ebx
 
 	/* look if we should exit */
-	mov CBFS_HEADER_PTR, %esi
-	mov CBFS_HEADER_ROMSIZE(%esi), %ecx
+	mov CBFS_HEADER_PTR, %ecx
+	mov CBFS_HEADER_ROMSIZE(%ecx), %ecx
 	bswap %ecx
 	not %ecx
 	add $1, %ecx
-- 
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