x86: flatten hierarchy4.14.1

It never made sense to have bootblock_* in init, but
pirq_routing.c in boot, and some ld scripts on the main
level while others live in subdirectories.

This patch flattens the directory hierarchy and makes
x86 more similar to the other architectures.

Change-Id: I4056038fe7813e4d3d3042c441e7ab6076a36384
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10901
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 117 insertions, 0 deletions

diff --git a/src/arch/x86/walkcbfs.S b/src/arch/x86/walkcbfs.S
new file mode 100644
index 0000000..60eb8b5
--- /dev/null
+++ b/src/arch/x86/walkcbfs.S
@@ -0,0 +1,117 @@
+#define CBFS_HEADER_PTR 0xfffffffc
+
+#define CBFS_HEADER_MAGIC 0
+#define CBFS_HEADER_VERSION (CBFS_HEADER_MAGIC + 4)
+#define CBFS_HEADER_ROMSIZE (CBFS_HEADER_VERSION + 4)
+#define CBFS_HEADER_BOOTBLOCKSIZE (CBFS_HEADER_ROMSIZE + 4)
+#define CBFS_HEADER_ALIGN (CBFS_HEADER_BOOTBLOCKSIZE + 4)
+#define CBFS_HEADER_OFFSET (CBFS_HEADER_ALIGN + 4)
+
+#define CBFS_FILE_MAGIC 0
+#define CBFS_FILE_LEN (CBFS_FILE_MAGIC + 8)
+#define CBFS_FILE_TYPE (CBFS_FILE_LEN + 4)
+#define CBFS_FILE_CHECKSUM (CBFS_FILE_TYPE + 4)
+#define CBFS_FILE_OFFSET (CBFS_FILE_CHECKSUM + 4)
+
+#define CBFS_FILE_STRUCTSIZE (CBFS_FILE_OFFSET + 4)
+
+/*
+ * input %esi: filename
+ * input %esp: return address (not pointer to return address!)
+ * output %eax: pointer to CBFS header
+ * clobbers %ebx, %ecx, %edi
+ */
+walkcbfs_asm:
+	cld
+
+	mov CBFS_HEADER_PTR, %eax
+	mov CBFS_HEADER_ROMSIZE(%eax), %ecx
+	bswap %ecx
+	mov $0, %ebx
+	sub %ecx, %ebx	/* rom base address in ebx */
+	mov CBFS_HEADER_OFFSET(%eax), %ecx
+	bswap %ecx
+	add %ecx, %ebx	/* address where we start looking for LARCHIVEs */
+
+	/* determine filename length */
+	mov $0, %eax
+1:
+	cmpb $0, (%eax,%esi)
+	jz 2f
+	add $1, %eax
+	jmp 1b
+2:
+	add $1, %eax
+walker:
+	mov 0(%ebx), %edi /* Check for LARCHIVE header */
+	cmp %edi, filemagic
+	jne searchfile
+	mov 4(%ebx), %edi
+	cmp %edi, filemagic+4
+	jne searchfile
+
+	/* LARCHIVE header found */
+	mov %ebx, %edi
+	add $CBFS_FILE_STRUCTSIZE, %edi /* edi = address of first byte after struct cbfs_file */
+	mov %eax, %ecx
+	repe cmpsb
+	/* zero flag set if strings are equal */
+	jnz tryharder
+
+	/* we found it! */
+	mov %ebx, %eax
+	jmp *%esp
+
+tryharder:
+	sub %ebx, %edi
+	sub $CBFS_FILE_STRUCTSIZE, %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
+	mov CBFS_HEADER_PTR, %edi
+	mov CBFS_HEADER_ALIGN(%edi), %edi
+	bswap %edi
+	sub $1, %edi
+	add %edi, %ecx
+	not %edi
+	and %edi, %ecx
+
+	/* if oldaddr >= addr, leave */
+	cmp %ebx, %ecx
+	jbe out
+
+	mov %ecx, %ebx
+
+check_for_exit:
+	/* look if we should exit: did we pass into the bootblock already? */
+	mov CBFS_HEADER_PTR, %ecx
+	mov CBFS_HEADER_BOOTBLOCKSIZE(%ecx), %ecx
+	bswap %ecx
+	not %ecx
+	add $1, %ecx
+
+	cmp %ecx, %ebx
+	/* if bootblockstart >= addr (==we're still in the data area) , jump back */
+	jbe walker
+
+out:
+	mov $0, %eax
+	jmp *%esp
+
+
+searchfile:
+	/* if filemagic isn't found, move forward cbfs_header->align bytes */
+	mov CBFS_HEADER_PTR, %edi
+	mov CBFS_HEADER_ALIGN(%edi), %edi
+	bswap %edi
+	add %edi, %ebx
+	jmp check_for_exit
+
+filemagic:
+	.ascii "LARCHIVE"