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| author | Graeme Russ <graeme.russ@gmail.com> | 2011-02-12 15:11:52 +1100 |
|---|---|---|
| committer | Graeme Russ <graeme.russ@gmail.com> | 2011-02-12 15:11:52 +1100 |
| commit | ed4cba79d640daa33806fa228c1a10c6bf9e2101 (patch) | |
| tree | b6500012ce46b0cd5ae43fdf0ff136f42e3e7133 /arch/i386/cpu/start.S | |
| parent | 2e2613d2c4755426cb6bfddf1ca7714b0deec177 (diff) | |
| download | bootable_bootloader_goldelico_gta04-ed4cba79d640daa33806fa228c1a10c6bf9e2101.zip bootable_bootloader_goldelico_gta04-ed4cba79d640daa33806fa228c1a10c6bf9e2101.tar.gz bootable_bootloader_goldelico_gta04-ed4cba79d640daa33806fa228c1a10c6bf9e2101.tar.bz2 | |
x86: Use Cache-As-RAM for initial stack
Diffstat (limited to 'arch/i386/cpu/start.S')
| -rw-r--r-- | arch/i386/cpu/start.S | 35 |
1 files changed, 17 insertions, 18 deletions
diff --git a/arch/i386/cpu/start.S b/arch/i386/cpu/start.S index 0ce9713..df9ca0d 100644 --- a/arch/i386/cpu/start.S +++ b/arch/i386/cpu/start.S @@ -72,41 +72,40 @@ _start: .globl early_board_init_ret early_board_init_ret: + /* Initialise Cache-As-RAM */ + jmp car_init +.globl car_init_ret +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 + */ + movl $CONFIG_SYS_INIT_SP_ADDR, %esp + /* Skip memory initialization if not starting from cold-reset */ movl %ebx, %ecx andl $GD_FLG_COLD_BOOT, %ecx jz skip_mem_init /* size memory */ - jmp mem_init -.globl mem_init_ret -mem_init_ret: + call mem_init skip_mem_init: /* fetch memory size (into %eax) */ - jmp get_mem_size -.globl get_mem_size_ret -get_mem_size_ret: + call get_mem_size + movl %eax, %esp #if CONFIG_SYS_SDRAM_ECC_ENABLE /* Skip ECC initialization if not starting from cold-reset */ movl %ebx, %ecx andl $GD_FLG_COLD_BOOT, %ecx - jz init_ecc_ret - jmp init_ecc + jz skip_ecc_init + call init_ecc -.globl init_ecc_ret -init_ecc_ret: +skip_init_ecc: #endif - /* Check we have enough memory for stack */ - movl $CONFIG_SYS_STACK_SIZE, %ecx - cmpl %ecx, %eax - jb die -mem_ok: - /* Set stack pointer to upper memory limit*/ - movl %eax, %esp - /* Test the stack */ pushl $0 popl %ecx |