x86: Add support for passing tables into U-Boot
The EFI stub provides information to U-Boot in a table. This includes the
memory map which is needed to decide where to relocate U-Boot. Collect this
information in the early init code and store it in global_data.
Fix up the BIST code at the same time since we don't have it when booting
from EFI and can assume it is 0.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index a0dec39..e5c1733 100644
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -42,6 +42,13 @@
/* Tell 32-bit code it is being entered from an in-RAM copy */
movl $GD_FLG_WARM_BOOT, %ebx
+
+ /*
+ * Zero the BIST (Built-In Self Test) value since we don't have it.
+ * It must be 0 or the previous loader would have reported an error.
+ */
+ movl $0, %ebp
+
jmp 1f
/* Add a way for tools to discover the _start entry point */
@@ -53,9 +60,13 @@
* Set %ebx to GD_FLG_COLD_BOOT to indicate this.
*/
movl $GD_FLG_COLD_BOOT, %ebx
-1:
+
/* Save BIST */
movl %eax, %ebp
+1:
+
+ /* Save table pointer */
+ movl %ecx, %esi
/* Load the segement registers to match the GDT loaded in start16.S */
movl $(X86_GDT_ENTRY_32BIT_DS * X86_GDT_ENTRY_SIZE), %eax
@@ -133,7 +144,13 @@
movl %esi, (%edx)
skip_hob:
+#else
+ /* Store table pointer */
+ movl %esp, %edx
+ addl $GD_TABLE, %edx
+ movl %esi, (%edx)
#endif
+
/* Setup first parameter to setup_gdt, pointer to global_data */
movl %esp, %eax
diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h
index 80ebe3e..f7e3889 100644
--- a/arch/x86/include/asm/global_data.h
+++ b/arch/x86/include/asm/global_data.h
@@ -69,6 +69,7 @@
char *mrc_output;
unsigned int mrc_output_len;
void *gdt; /* Global descriptor table */
+ ulong table; /* Table pointer from previous loader */
};
#endif
diff --git a/arch/x86/lib/asm-offsets.c b/arch/x86/lib/asm-offsets.c
index 70ccf1b..9da04dd 100644
--- a/arch/x86/lib/asm-offsets.c
+++ b/arch/x86/lib/asm-offsets.c
@@ -21,5 +21,6 @@
#ifdef CONFIG_HAVE_FSP
DEFINE(GD_HOB_LIST, offsetof(gd_t, arch.hob_list));
#endif
+ DEFINE(GD_TABLE, offsetof(gd_t, arch.table));
return 0;
}