diff options
Diffstat (limited to 'arch/avr32/boot')
| -rw-r--r-- | arch/avr32/boot/u-boot/head.S | 35 |
1 files changed, 29 insertions, 6 deletions
diff --git a/arch/avr32/boot/u-boot/head.S b/arch/avr32/boot/u-boot/head.S index 4488fa27fe9..2ffc298f061 100644 --- a/arch/avr32/boot/u-boot/head.S +++ b/arch/avr32/boot/u-boot/head.S @@ -8,6 +8,8 @@ * published by the Free Software Foundation. */ #include <asm/setup.h> +#include <asm/thread_info.h> +#include <asm/sysreg.h> /* * The kernel is loaded where we want it to be and all caches @@ -20,11 +22,6 @@ .section .init.text,"ax" .global _start _start: - /* Check if the boot loader actually provided a tag table */ - lddpc r0, magic_number - cp.w r12, r0 - brne no_tag_table - /* Initialize .bss */ lddpc r2, bss_start_addr lddpc r3, end_addr @@ -34,6 +31,25 @@ _start: cp r2, r3 brlo 1b + /* Initialize status register */ + lddpc r0, init_sr + mtsr SYSREG_SR, r0 + + /* Set initial stack pointer */ + lddpc sp, stack_addr + sub sp, -THREAD_SIZE + +#ifdef CONFIG_FRAME_POINTER + /* Mark last stack frame */ + mov lr, 0 + mov r7, 0 +#endif + + /* Check if the boot loader actually provided a tag table */ + lddpc r0, magic_number + cp.w r12, r0 + brne no_tag_table + /* * Save the tag table address for later use. This must be done * _after_ .bss has been initialized... @@ -53,8 +69,15 @@ bss_start_addr: .long __bss_start end_addr: .long _end +init_sr: + .long 0x007f0000 /* Supervisor mode, everything masked */ +stack_addr: + .long init_thread_union +panic_addr: + .long panic no_tag_table: sub r12, pc, (. - 2f) - bral panic + /* branch to panic() which can be far away with that construct */ + lddpc pc, panic_addr 2: .asciz "Boot loader didn't provide correct magic number\n" |