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grub2/0015-Refactor-arm-uboot-code-to-make-it-genereic.patch
Peter Jones 31cddd6fc0 Add some features to do-rebase 
Signed-off-by: Peter Jones <pjones@redhat.com>
2018-07-10 15:11:55 -04:00

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From d08c9685149e7788001ac9a209baa1d84c3628e0 Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Mon, 8 May 2017 17:47:57 +0200
Subject: [PATCH] Refactor arm-uboot code to make it genereic.
arm-coreboot startup code can be very similar to arm-uboot but current code has
U-Boot specific references. So split U-Boot part from generic part.
---
grub-core/Makefile.core.def | 4 +-
grub-core/kern/arm/uboot/init.c | 70 ++++++++++++++++++++++++++++++
grub-core/kern/uboot/init.c | 16 -------
grub-core/kern/uboot/uboot.c | 35 ---------------
include/grub/arm/startup.h | 16 +++++++
grub-core/kern/arm/{uboot => }/startup.S | 66 ++++-------------------------
grub-core/kern/arm/uboot/uboot.S | 73 ++++++++++++++++++++++++++++++++
7 files changed, 171 insertions(+), 109 deletions(-)
create mode 100644 grub-core/kern/arm/uboot/init.c
create mode 100644 include/grub/arm/startup.h
rename grub-core/kern/arm/{uboot => }/startup.S (77%)
create mode 100644 grub-core/kern/arm/uboot/uboot.S
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 8dcd0e5a998..fb59a7b1d6a 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -105,7 +105,7 @@ kernel = {
mips_startup = kern/mips/startup.S;
sparc64_ieee1275_startup = kern/sparc64/ieee1275/crt0.S;
powerpc_ieee1275_startup = kern/powerpc/ieee1275/startup.S;
- arm_uboot_startup = kern/arm/uboot/startup.S;
+ arm_uboot_startup = kern/arm/startup.S;
arm_efi_startup = kern/arm/efi/startup.S;
arm64_efi_startup = kern/arm64/efi/startup.S;
@@ -149,6 +149,8 @@ kernel = {
uboot = kern/uboot/init.c;
uboot = kern/uboot/hw.c;
uboot = term/uboot/console.c;
+ arm_uboot = kern/arm/uboot/init.c;
+ arm_uboot = kern/arm/uboot/uboot.S;
terminfoinkernel = term/terminfo.c;
terminfoinkernel = term/tparm.c;
diff --git a/grub-core/kern/arm/uboot/init.c b/grub-core/kern/arm/uboot/init.c
new file mode 100644
index 00000000000..2a6aa3fdd3d
--- /dev/null
+++ b/grub-core/kern/arm/uboot/init.c
@@ -0,0 +1,70 @@
+/* init.c - generic U-Boot initialization and finalization */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2016 Free Software Foundation, Inc.
+ *
+ * GRUB 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/uboot/uboot.h>
+#include <grub/arm/startup.h>
+#include <grub/uboot/api_public.h>
+
+extern int (*grub_uboot_syscall_ptr) (int, int *, ...);
+
+grub_uint32_t
+grub_uboot_get_machine_type (void)
+{
+ return grub_arm_saved_registers.r[1];
+}
+
+grub_addr_t
+grub_uboot_get_boot_data (void)
+{
+ return grub_arm_saved_registers.r[2];
+}
+
+int
+grub_uboot_api_init (void)
+{
+ struct api_signature *start, *end;
+ struct api_signature *p;
+ grub_addr_t grub_uboot_search_hint = grub_arm_saved_registers.sp;
+ if (grub_uboot_search_hint)
+ {
+ /* Extended search range to work around Trim Slice U-Boot issue */
+ start = (struct api_signature *) ((grub_uboot_search_hint & ~0x000fffff)
+ - 0x00500000);
+ end =
+ (struct api_signature *) ((grub_addr_t) start + UBOOT_API_SEARCH_LEN -
+ API_SIG_MAGLEN + 0x00500000);
+ }
+ else
+ {
+ start = 0;
+ end = (struct api_signature *) (256 * 1024 * 1024);
+ }
+
+ /* Structure alignment is (at least) 8 bytes */
+ for (p = start; p < end; p = (void *) ((grub_addr_t) p + 8))
+ {
+ if (grub_memcmp (&(p->magic), API_SIG_MAGIC, API_SIG_MAGLEN) == 0)
+ {
+ grub_uboot_syscall_ptr = p->syscall;
+ return p->version;
+ }
+ }
+
+ return 0;
+}
diff --git a/grub-core/kern/uboot/init.c b/grub-core/kern/uboot/init.c
index 5dcc106ed9b..3e338645c57 100644
--- a/grub-core/kern/uboot/init.c
+++ b/grub-core/kern/uboot/init.c
@@ -36,30 +36,14 @@
extern char __bss_start[];
extern char _end[];
extern grub_size_t grub_total_module_size;
-extern int (*grub_uboot_syscall_ptr) (int, int *, ...);
static unsigned long timer_start;
-extern grub_uint32_t grub_uboot_machine_type;
-extern grub_addr_t grub_uboot_boot_data;
-
void
grub_exit (void)
{
grub_uboot_return (0);
}
-grub_uint32_t
-grub_uboot_get_machine_type (void)
-{
- return grub_uboot_machine_type;
-}
-
-grub_addr_t
-grub_uboot_get_boot_data (void)
-{
- return grub_uboot_boot_data;
-}
-
static grub_uint64_t
uboot_timer_ms (void)
{
diff --git a/grub-core/kern/uboot/uboot.c b/grub-core/kern/uboot/uboot.c
index 6800a4beb1c..cf0168e62dd 100644
--- a/grub-core/kern/uboot/uboot.c
+++ b/grub-core/kern/uboot/uboot.c
@@ -39,48 +39,13 @@
* returns: 0 if the call not found, 1 if serviced
*/
-extern int (*grub_uboot_syscall_ptr) (int, int *, ...);
extern int grub_uboot_syscall (int, int *, ...);
-extern grub_addr_t grub_uboot_search_hint;
static struct sys_info uboot_sys_info;
static struct mem_region uboot_mem_info[5];
static struct device_info * devices;
static int num_devices;
-int
-grub_uboot_api_init (void)
-{
- struct api_signature *start, *end;
- struct api_signature *p;
-
- if (grub_uboot_search_hint)
- {
- /* Extended search range to work around Trim Slice U-Boot issue */
- start = (struct api_signature *) ((grub_uboot_search_hint & ~0x000fffff)
- - 0x00500000);
- end =
- (struct api_signature *) ((grub_addr_t) start + UBOOT_API_SEARCH_LEN -
- API_SIG_MAGLEN + 0x00500000);
- }
- else
- {
- start = 0;
- end = (struct api_signature *) (256 * 1024 * 1024);
- }
-
- /* Structure alignment is (at least) 8 bytes */
- for (p = start; p < end; p = (void *) ((grub_addr_t) p + 8))
- {
- if (grub_memcmp (&(p->magic), API_SIG_MAGIC, API_SIG_MAGLEN) == 0)
- {
- grub_uboot_syscall_ptr = p->syscall;
- return p->version;
- }
- }
-
- return 0;
-}
/*
* All functions below are wrappers around the grub_uboot_syscall() function
diff --git a/include/grub/arm/startup.h b/include/grub/arm/startup.h
new file mode 100644
index 00000000000..9afb6c57c0b
--- /dev/null
+++ b/include/grub/arm/startup.h
@@ -0,0 +1,16 @@
+#ifndef GRUB_STARTUP_CPU_HEADER
+#define GRUB_STARTUP_CPU_HEADER
+
+struct grub_arm_startup_registers
+{
+ /* registers 0-11 */
+ /* for U-boot r[1] is machine type */
+ /* for U-boot r[2] is boot data */
+ grub_uint32_t r[12];
+ grub_uint32_t sp;
+ grub_uint32_t lr;
+};
+
+extern struct grub_arm_startup_registers grub_arm_saved_registers;
+
+#endif
diff --git a/grub-core/kern/arm/uboot/startup.S b/grub-core/kern/arm/startup.S
similarity index 77%
rename from grub-core/kern/arm/uboot/startup.S
rename to grub-core/kern/arm/startup.S
index 5efaae16e83..640837cba51 100644
--- a/grub-core/kern/arm/uboot/startup.S
+++ b/grub-core/kern/arm/startup.S
@@ -86,7 +86,7 @@ FUNCTION(codestart)
@ Stack pointer used as start address for signature probing
mov r12, sp
adr sp, entry_state
- push {r1-r12,lr} @ store U-Boot context (sp in r12)
+ push {r0-r12,lr} @ store U-Boot context (sp in r12)
adr r1, _start
ldr r0, bss_start_ptr @ src
@@ -153,69 +153,21 @@ reloc_done:
b EXT_C(grub_main)
- /*
- * uboot_syscall():
- * This function is effectively a veneer, so it cannot
- * modify the stack or corrupt any registers other than
- * r12 (ip). Furthermore it needs to restore r8 for
- * U-Boot (Global Data Pointer) and preserve it for Grub.
- */
-FUNCTION(grub_uboot_syscall)
- str r8, transition_space
- str lr, transition_space + 4
- str r9, transition_space + 8
-
- ldr r8, gd_backup
- ldr r9, gd_backup + 4
-
- bl do_syscall
-
- ldr r8, transition_space
- ldr lr, transition_space + 4
- ldr r9, transition_space + 8
-
- bx lr
-do_syscall:
-
- ldr ip, grub_uboot_syscall_ptr
- bx ip
-
-FUNCTION(grub_uboot_return)
- adr sp, entry_state_end
- pop {r4-r12, lr}
- mov sp, r12
- bx lr
-
-
.align 3
-@ U-boot context stack space
-entry_state_end:
-VARIABLE(grub_uboot_machine_type)
+@ U-boot/coreboot context stack space
+VARIABLE(grub_arm_saved_registers)
+ .long 0 @ r0
.long 0 @ r1
-VARIABLE(grub_uboot_boot_data)
.long 0 @ r2
.long 0 @ r3
.long 0 @ r4
.long 0 @ r5
.long 0 @ r6
.long 0 @ r7
-gd_backup:
- .long 0 @ r8 - U-Boot global data pointer up to 2013-09-21
- .long 0 @ r9 - U-Boot global data pointer 2013-09-21 onwards
- .long 0 @ r10
- .long 0 @ r11
-VARIABLE(grub_uboot_search_hint)@ U-Boot stack pointer -
- .long 0 @ also API signature address hint.
- .long 0 @ lr
-entry_state: @ backup for U-Boot context
-
-@ GRUB context stack space
-transition_space:
.long 0 @ r8
- .long 0 @ lr
.long 0 @ r9
-
-VARIABLE(grub_uboot_syscall_ptr)
- .long 0 @
-
- END
+ .long 0 @ r10
+ .long 0 @ r11
+ .long 0 @ sp
+ .long 0 @ lr
+entry_state:
diff --git a/grub-core/kern/arm/uboot/uboot.S b/grub-core/kern/arm/uboot/uboot.S
new file mode 100644
index 00000000000..d128775f19e
--- /dev/null
+++ b/grub-core/kern/arm/uboot/uboot.S
@@ -0,0 +1,73 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2013 Free Software Foundation, Inc.
+ *
+ * GRUB 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/offsets.h>
+#include <grub/symbol.h>
+#include <grub/machine/kernel.h>
+
+ /*
+ * uboot_syscall():
+ * This function is effectively a veneer, so it cannot
+ * modify the stack or corrupt any registers other than
+ * r12 (ip). Furthermore it needs to restore r8 for
+ * U-Boot (Global Data Pointer) and preserve it for Grub.
+ */
+FUNCTION(grub_uboot_syscall)
+ str r8, transition_space
+ str lr, transition_space + 4
+ str r9, transition_space + 8
+
+ ldr ip, saved_registers_ptr
+ ldr r8, [ip, #4 * 8]
+ ldr r9, [ip, #4 * 9]
+
+ bl do_syscall
+
+ ldr r8, transition_space
+ ldr lr, transition_space + 4
+ ldr r9, transition_space + 8
+
+ bx lr
+do_syscall:
+
+ ldr ip, grub_uboot_syscall_ptr
+ bx ip
+
+FUNCTION(grub_uboot_return)
+ ldr ip, saved_registers_ptr
+ ldr sp, [ip, #4 * 4]
+ pop {r4-r12, lr}
+ mov sp, r12
+ bx lr
+
+
+ .align 3
+
+@ GRUB context stack space
+transition_space:
+ .long 0 @ r8
+ .long 0 @ lr
+ .long 0 @ r9
+
+saved_registers_ptr:
+ .long EXT_C(grub_arm_saved_registers)
+
+VARIABLE(grub_uboot_syscall_ptr)
+ .long 0 @
+
+ END
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