diff options
Diffstat (limited to 'arch/x86/cpu/start.S')
| -rw-r--r-- | arch/x86/cpu/start.S | 40 |
1 files changed, 31 insertions, 9 deletions
diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S index 338bab19e4..b0d0ac0610 100644 --- a/arch/x86/cpu/start.S +++ b/arch/x86/cpu/start.S @@ -13,6 +13,7 @@ #include <config.h> #include <version.h> #include <asm/global_data.h> +#include <asm/post.h> #include <asm/processor.h> #include <asm/processor-flags.h> #include <generated/generic-asm-offsets.h> @@ -49,6 +50,8 @@ _start: */ movw $GD_FLG_COLD_BOOT, %bx 1: + /* Save BIST */ + movl %eax, %ebp /* Load the segement registes to match the gdt loaded in start16.S */ movl $(X86_GDT_ENTRY_32BIT_DS * X86_GDT_ENTRY_SIZE), %eax @@ -65,6 +68,7 @@ _start: jmp early_board_init .globl early_board_init_ret early_board_init_ret: + post_code(POST_START) /* Initialise Cache-As-RAM */ jmp car_init @@ -74,16 +78,29 @@ car_init_ret: * We now have CONFIG_SYS_CAR_SIZE bytes of Cache-As-RAM (or SRAM, * or fully initialised SDRAM - we really don't care which) * starting at CONFIG_SYS_CAR_ADDR to be used as a temporary stack + * and early malloc area. The MRC requires some space at the top. + * + * Stack grows down from top of CAR. We have: + * + * top-> CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE + * MRC area + * global_data + * x86 global descriptor table + * early malloc area + * stack + * bottom-> CONFIG_SYS_CAR_ADDR */ - - /* Stack grows down from top of CAR */ - movl $(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE), %esp + movl $(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE - 4), %esp +#ifdef CONFIG_DCACHE_RAM_MRC_VAR_SIZE + subl $CONFIG_DCACHE_RAM_MRC_VAR_SIZE, %esp +#endif /* Reserve space on stack for global data */ subl $GENERATED_GBL_DATA_SIZE, %esp /* Align global data to 16-byte boundary */ andl $0xfffffff0, %esp + post_code(POST_START_STACK) /* Zero the global data since it won't happen later */ xorl %eax, %eax @@ -91,31 +108,36 @@ car_init_ret: movl %esp, %edi rep stosb - /* Setup first parameter to setup_gdt */ + /* Setup first parameter to setup_gdt, pointer to global_data */ movl %esp, %eax /* Reserve space for global descriptor table */ subl $X86_GDT_SIZE, %esp + /* Align temporary global descriptor table to 16-byte boundary */ + andl $0xfffffff0, %esp + movl %esp, %ecx + #if defined(CONFIG_SYS_MALLOC_F_LEN) subl $CONFIG_SYS_MALLOC_F_LEN, %esp movl %eax, %edx addl $GD_MALLOC_BASE, %edx movl %esp, (%edx) #endif - - /* Align temporary global descriptor table to 16-byte boundary */ - andl $0xfffffff0, %esp + /* Store BIST */ + movl %eax, %edx + addl $GD_BIST, %edx + movl %ebp, (%edx) /* Set second parameter to setup_gdt */ - movl %esp, %edx + movl %ecx, %edx /* Setup global descriptor table so gd->xyz works */ call setup_gdt /* Set parameter to board_init_f() to boot flags */ + post_code(POST_START_DONE) xorl %eax, %eax - movw %bx, %ax /* Enter, U-boot! */ call board_init_f |