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-rw-r--r--util/cbfstool/cbfs-payload-linux.c5
-rw-r--r--util/cbfstool/linux.h6
-rw-r--r--util/cbfstool/linux_trampoline.c44
-rw-r--r--util/cbfstool/linux_trampoline.h40
4 files changed, 79 insertions, 16 deletions
diff --git a/util/cbfstool/cbfs-payload-linux.c b/util/cbfstool/cbfs-payload-linux.c
index 33a5e1afb1..9e9a8741d0 100644
--- a/util/cbfstool/cbfs-payload-linux.c
+++ b/util/cbfstool/cbfs-payload-linux.c
@@ -302,9 +302,8 @@ int parse_bzImage_to_payload(const struct buffer *input,
PAYLOAD_SEGMENT_CODE, kernel_base);
/* trampoline */
- uint64_t entrypoint = 0x40000; /*TODO: any better place? */
bzp_output_segment(&bzp, &bzp.trampoline,
- PAYLOAD_SEGMENT_CODE, entrypoint);
+ PAYLOAD_SEGMENT_CODE, TRAMPOLINE_ENTRY_LOC);
/* cmdline */
bzp_output_segment(&bzp, &bzp.cmdline,
@@ -315,7 +314,7 @@ int parse_bzImage_to_payload(const struct buffer *input,
PAYLOAD_SEGMENT_DATA, initrd_base);
/* Terminating entry segment. */
- bzp_output_segment(&bzp, NULL, PAYLOAD_SEGMENT_ENTRY, entrypoint);
+ bzp_output_segment(&bzp, NULL, PAYLOAD_SEGMENT_ENTRY, TRAMPOLINE_ENTRY_LOC);
/* Set size of buffer taking into account potential compression. */
buffer_set_size(&bzp.output, bzp.offset);
diff --git a/util/cbfstool/linux.h b/util/cbfstool/linux.h
index 20837e3707..ae747e6c5e 100644
--- a/util/cbfstool/linux.h
+++ b/util/cbfstool/linux.h
@@ -26,17 +26,13 @@
*/
#include <stdint.h>
+#include "linux_trampoline.h"
typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
-#define LINUX_PARAM_LOC 0x90000
-#define COMMAND_LINE_LOC 0x91000
-#define GDT_LOC 0x92000
-#define STACK_LOC 0x93000
-
#define E820MAX 32 /* number of entries in E820MAP */
struct e820entry {
unsigned long long addr; /* start of memory segment */
diff --git a/util/cbfstool/linux_trampoline.c b/util/cbfstool/linux_trampoline.c
index 368d63a807..649bb64b0e 100644
--- a/util/cbfstool/linux_trampoline.c
+++ b/util/cbfstool/linux_trampoline.c
@@ -24,12 +24,13 @@
*/
.code32
.data
+
+#include "linux_trampoline.h"
#define HEADER_SIG 0x4f49424c // LBIO little endian
#define CB_TAG_FORWARD 0x11
#define CB_TAG_MEMORY 0x1
#define CB_TAG_FRAMEBUFFER 0x12
-#define LINUX_PARAM_LOC 0x90000
#define E820_NR_OFFSET 0x1e8
#define LINUX_ENTRY_OFFSET 0x214
#define E820_OFFSET 0x2d0
@@ -101,6 +102,30 @@ add 4(%ebx), %ebx
dec %ecx
jnz .tableScan
+/* Setup basic code and data segment selectors for Linux
+**
+** Flat code segment descriptor:
+** selector: 0x10
+** base : 0x00000000
+** limit : 0xFFFFFFFF
+** type : code, execute, read
+**
+** Flat data segment descriptor:
+** selector: 0x18
+** base : 0x00000000
+** limit : 0xFFFFFFFF
+** type : data, read/write
+**
+** Use TRAMPOLINE_ENTRY_LOC as a scratchpad.
+*/
+mov $TRAMPOLINE_ENTRY_LOC, %eax
+sgdt (%eax)
+mov 2(%eax), %ebx
+movl $0x0000ffff, 16(%ebx)
+movl $0x00cf9b00, 20(%ebx)
+movl $0x0000ffff, 24(%ebx)
+movl $0x00cf9300, 28(%ebx)
+
/* finally: jump to kernel */
mov $LINUX_PARAM_LOC, %esi
jmp *(LINUX_PARAM_LOC + LINUX_ENTRY_OFFSET)
@@ -128,13 +153,16 @@ trampoline_size:
const unsigned char trampoline[] = {
0xfc, 0x31, 0xd2, 0xb9, 0x00, 0x00, 0x00, 0x00, 0xbb, 0x00, 0x00, 0x01, 0x00, 0x01, 0xcb, 0x8b,
0x01, 0x3d, 0x4c, 0x42, 0x49, 0x4f, 0x74, 0x07, 0x83, 0xc1, 0x10, 0x39, 0xcb, 0x75, 0xe9, 0x39,
-0xcb, 0x74, 0x60, 0x8b, 0x59, 0x04, 0x01, 0xcb, 0x8b, 0x49, 0x14, 0x83, 0x3b, 0x11, 0x75, 0x05,
-0x8b, 0x4b, 0x08, 0xeb, 0xd3, 0x83, 0x3b, 0x01, 0x75, 0x33, 0x8b, 0x43, 0x04, 0x83, 0xe8, 0x08,
-0xc1, 0xe8, 0x02, 0x3d, 0xa0, 0x00, 0x00, 0x00, 0x7e, 0x05, 0xb8, 0xa0, 0x00, 0x00, 0x00, 0x89,
-0xc6, 0xbf, 0x05, 0x00, 0x00, 0x00, 0xf7, 0xf7, 0xa3, 0xe8, 0x01, 0x09, 0x00, 0x89, 0xf0, 0x91,
-0x8d, 0x73, 0x08, 0xbf, 0xd0, 0x02, 0x09, 0x00, 0xf3, 0xa5, 0x91, 0xeb, 0x05, 0x83, 0x3b, 0x12,
-0x75, 0x00, 0x03, 0x5b, 0x04, 0x49, 0x75, 0xb3, 0xbe, 0x00, 0x00, 0x09, 0x00, 0xff, 0x25, 0x14,
-0x02, 0x09, 0x00, 0xf4, 0xeb, 0xfd
+0xcb, 0x0f, 0x84, 0x85, 0x00, 0x00, 0x00, 0x8b, 0x59, 0x04, 0x01, 0xcb, 0x8b, 0x49, 0x14, 0x83,
+0x3b, 0x11, 0x75, 0x05, 0x8b, 0x4b, 0x08, 0xeb, 0xcf, 0x83, 0x3b, 0x01, 0x75, 0x33, 0x8b, 0x43,
+0x04, 0x83, 0xe8, 0x08, 0xc1, 0xe8, 0x02, 0x3d, 0xa0, 0x00, 0x00, 0x00, 0x7e, 0x05, 0xb8, 0xa0,
+0x00, 0x00, 0x00, 0x89, 0xc6, 0xbf, 0x05, 0x00, 0x00, 0x00, 0xf7, 0xf7, 0xa3, 0xe8, 0x01, 0x09,
+0x00, 0x89, 0xf0, 0x91, 0x8d, 0x73, 0x08, 0xbf, 0xd0, 0x02, 0x09, 0x00, 0xf3, 0xa5, 0x91, 0xeb,
+0x05, 0x83, 0x3b, 0x12, 0x75, 0x00, 0x03, 0x5b, 0x04, 0x49, 0x75, 0xb3, 0xb8, 0x00, 0x00, 0x04,
+0x00, 0x0f, 0x01, 0x00, 0x8b, 0x58, 0x02, 0xc7, 0x43, 0x10, 0xff, 0xff, 0x00, 0x00, 0xc7, 0x43,
+0x14, 0x00, 0x9b, 0xcf, 0x00, 0xc7, 0x43, 0x18, 0xff, 0xff, 0x00, 0x00, 0xc7, 0x43, 0x1c, 0x00,
+0x93, 0xcf, 0x00, 0xbe, 0x00, 0x00, 0x09, 0x00, 0xff, 0x25, 0x14, 0x02, 0x09, 0x00, 0xf4, 0xeb,
+0xfd
};
const void * const trampoline_start = &trampoline;
diff --git a/util/cbfstool/linux_trampoline.h b/util/cbfstool/linux_trampoline.h
new file mode 100644
index 0000000000..ed5b824825
--- /dev/null
+++ b/util/cbfstool/linux_trampoline.h
@@ -0,0 +1,40 @@
+/*
+ * This file is part of coreboot..
+ *
+ * Based on work by Patrick Georgi <patrick@georgi-clan.de>
+ * Copyright 2014 Curt Brune <curt@cumulusnetworks.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; 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
+ */
+
+/*
+ * This file contains #define constants used by both the Linux
+ * trampoline C-code and assembly language code. As such it can only
+ * contain preprocessor macros. Do not inlucde C language
+ * declarations in this file.
+ */
+
+#ifndef LINUX_TRAMPOLINE_H__
+#define LINUX_TRAMPOLINE_H__
+
+/*
+ * Trampoline entry point
+ * TODO: any better place?
+ */
+#define TRAMPOLINE_ENTRY_LOC 0x40000
+
+#define LINUX_PARAM_LOC 0x90000
+#define COMMAND_LINE_LOC 0x91000
+
+#endif /* LINUX_TRAMPOLINE_H__ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-17 18:13:27 +0000