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 ---
Changes in v2: - Zero BIST when starting from EFI/coreboot
arch/x86/cpu/start.S | 19 ++++++++++++++++++- arch/x86/include/asm/global_data.h | 1 + arch/x86/lib/asm-offsets.c | 1 + 3 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S index 9b2584d..fdef2bb 100644 --- a/arch/x86/cpu/start.S +++ b/arch/x86/cpu/start.S @@ -42,6 +42,13 @@ _x86boot_start:
/* 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 @@ _start: * Set %bx to 0 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 @@ car_init_ret: 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 @@ struct arch_global_data { 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 @@ int main(void) #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; }