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authorStefan Reinauer <stefan.reinauer@coreboot.org>2015-07-13 09:39:15 +0200
committerStefan Reinauer <stefan.reinauer@coreboot.org>2015-07-13 21:04:56 +0200
commit6cb3a59fd5e754c3627b79db21c5bcc284bfd721 (patch)
treee83db5b11ee4a29d496dcf2798d024b6b8455ab7 /src/arch/x86/wakeup.S
parent9693885ad88d21ead7bd9ebc32f3e4901841b18b (diff)
downloadcoreboot-6cb3a59fd5e754c3627b79db21c5bcc284bfd721.tar.xz
x86: flatten hierarchy
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>
Diffstat (limited to 'src/arch/x86/wakeup.S')
-rw-r--r--src/arch/x86/wakeup.S99
1 files changed, 99 insertions, 0 deletions
diff --git a/src/arch/x86/wakeup.S b/src/arch/x86/wakeup.S
new file mode 100644
index 0000000000..38d6ea43ae
--- /dev/null
+++ b/src/arch/x86/wakeup.S
@@ -0,0 +1,99 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2009 Rudolf Marek <r.marek@assembler.cz>
+ * Copyright (C) 2009 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.
+ */
+
+#define WAKEUP_BASE 0x600
+#define RELOCATED(x) (x - __wakeup + WAKEUP_BASE)
+
+/* CR0 bits */
+#define PE (1 << 0)
+
+#ifdef __x86_64__
+ .code64
+#else
+ .code32
+#endif
+
+ .globl __wakeup
+__wakeup:
+ /* First prepare the jmp to the resume vector */
+ mov 0x4(%esp), %eax /* vector */
+ /* last 4 bits of linear addr are taken as offset */
+ andw $0x0f, %ax
+ movw %ax, (__wakeup_offset)
+ mov 0x4(%esp), %eax
+ /* the rest is taken as segment */
+ shr $4, %eax
+ movw %ax, (__wakeup_segment)
+
+ /* Then overwrite coreboot with our backed up memory */
+ cld
+ movl 8(%esp), %esi
+ movl 12(%esp), %edi
+ movl 16(%esp), %ecx
+ shrl $2, %ecx
+ rep movsl
+
+ /* Activate the right segment descriptor real mode. */
+ ljmp $0x28, $RELOCATED(1f)
+1:
+.code16
+ /* 16 bit code from here on... */
+
+ /* Load the segment registers w/ properly configured
+ * segment descriptors. They will retain these
+ * configurations (limits, writability, etc.) once
+ * protected mode is turned off.
+ */
+ mov $0x30, %ax
+ mov %ax, %ds
+ mov %ax, %es
+ mov %ax, %fs
+ mov %ax, %gs
+ mov %ax, %ss
+
+ /* Turn off protection */
+ movl %cr0, %eax
+ andl $~PE, %eax
+ movl %eax, %cr0
+
+ /* Now really going into real mode */
+ ljmp $0, $RELOCATED(1f)
+1:
+ movw $0x0, %ax
+ movw %ax, %ds
+ movw %ax, %es
+ movw %ax, %ss
+ movw %ax, %fs
+ movw %ax, %gs
+
+ /* This is a FAR JMP to the OS waking vector. The C code changed
+ * the address to be correct.
+ */
+ .byte 0xea
+
+__wakeup_offset = RELOCATED(.)
+ .word 0x0000
+
+__wakeup_segment = RELOCATED(.)
+ .word 0x0000
+
+ .globl __wakeup_size
+__wakeup_size:
+ .long . - __wakeup