At present this leaves the stack at the pre-relocation value. This is not
ideal since we want to have U-Boot running entirely from the top of
memory.
In addition, the new global_data pointer is not actually used, since
the global_data pointer itself is relocated, then the pre-relocation value
is changed, so the effective value (after relocation) does not update.
Adjust the implementation to follow the 32-bit code more closely, with a
trampoline function which is passed the new stack and global_data pointer.
This ensures that the correct values come through even when relocating.
Signed-off-by: Simon Glass <s...@chromium.org>
---
arch/x86/cpu/start64.S | 19 +++++++++++++++++++
arch/x86/include/asm/u-boot-x86.h | 11 +++++++++++
common/board_f.c | 12 +++++++-----
3 files changed, 37 insertions(+), 5 deletions(-)
diff --git a/arch/x86/cpu/start64.S b/arch/x86/cpu/start64.S
index 7be834788b9f..78e894d2a21a 100644
--- a/arch/x86/cpu/start64.S
+++ b/arch/x86/cpu/start64.S
@@ -26,3 +26,22 @@ _start:
/* Should not return here */
jmp .
+
+.globl board_init_f_r_trampoline64
+.type board_init_f_r_trampoline64, @function
+board_init_f_r_trampoline64:
+ /*
+ * SDRAM has been initialised, U-Boot code has been copied into
+ * RAM, BSS has been cleared and relocation adjustments have been
+ * made. It is now time to jump into the in-RAM copy of U-Boot
+ *
+ * %eax = Address of top of new stack
+ */
+
+ /* Stack grows down from top of SDRAM */
+ movq %rsi, %rsp
+
+ /* New gd is in rdi */
+
+ /* Re-enter U-Boot by calling board_init_f_r() */
+ call board_init_f_r
diff --git a/arch/x86/include/asm/u-boot-x86.h
b/arch/x86/include/asm/u-boot-x86.h
index 1610d7237bcd..3703094027d5 100644
--- a/arch/x86/include/asm/u-boot-x86.h
+++ b/arch/x86/include/asm/u-boot-x86.h
@@ -109,6 +109,17 @@ int fsp_save_s3_stack(void);
*/
void __noreturn board_init_f_r_trampoline(ulong sp);
+/**
+ * board_init_f_r_trampoline64() - jump to relocated address with new stack
+ *
+ * This is the 64-bit version
+ *
+ * @new_gd: New global_data pointer to use
+ * @sp: New stack pointer to pass on to board_init_r()
+ */
+void __noreturn board_init_f_r_trampoline64(struct global_data *new_gd,
+ ulong sp);
+
void __noreturn board_init_f_r(void);
int arch_misc_init(void);
diff --git a/common/board_f.c b/common/board_f.c
index f3c1ab53b1c6..f252a8eed5fd 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -731,8 +731,7 @@ static int fix_fdt(void)
#endif
/* ARM calls relocate_code from its crt0.S */
-#if !defined(CONFIG_ARM) && !defined(CONFIG_SANDBOX) && \
- !CONFIG_IS_ENABLED(X86_64)
+#if !defined(CONFIG_ARM) && !defined(CONFIG_SANDBOX)
static int jump_to_copy(void)
{
@@ -754,7 +753,11 @@ static int jump_to_copy(void)
* (CPU cache)
*/
arch_setup_gd(gd->new_gd);
- board_init_f_r_trampoline(gd->start_addr_sp);
+# if CONFIG_IS_ENABLED(X86_64)
+ board_init_f_r_trampoline64(gd->new_gd, gd->start_addr_sp);
+# else
+ board_init_f_r_trampoline(gd->start_addr_sp);
+# endif
#else
relocate_code(gd->start_addr_sp, gd->new_gd, gd->relocaddr);
#endif
@@ -969,8 +972,7 @@ static const init_fnc_t init_sequence_f[] = {
* watchdog device is not serviced is as small as possible.
*/
cyclic_unregister_all,
-#if !defined(CONFIG_ARM) && !defined(CONFIG_SANDBOX) && \
- !CONFIG_IS_ENABLED(X86_64)
+#if !defined(CONFIG_ARM) && !defined(CONFIG_SANDBOX)
jump_to_copy,
#endif
NULL,
--
2.40.0.348.gf938b09366-goog
