diff options
Diffstat (limited to 'src/arch/arm')
| -rw-r--r-- | src/arch/arm/armv7/bootblock.S | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/src/arch/arm/armv7/bootblock.S b/src/arch/arm/armv7/bootblock.S index e1879c0b30..47813a78f8 100644 --- a/src/arch/arm/armv7/bootblock.S +++ b/src/arch/arm/armv7/bootblock.S @@ -62,14 +62,43 @@ init_stack_loop: cmp r0, r1 bne init_stack_loop + /* Set stackpointer in internal RAM */ + ldr sp, =_estack + + /* + * For platforms where the flash is memory mapped (qemu), check if the + * bootblock needs to relocate itself. + */ +check_position: + adr r0, check_position + ldr r1, =check_position + + cmp r0, r1 + beq call_bootblock + + /* Calculate source */ + ldr r2, =_program + sub r1, r1, r2 + sub r1, r0, r1 + /* Get destination */ + ldr r0, =_program + /* Get size */ + ldr r2, =_eprogram + sub r2, r2, r0 + + bl memcpy + + /* Get absolute address */ + ldr lr, =call_bootblock + /* Directly modify pc as branch instruction changes the state */ + mov pc, lr + call_bootblock: /* Restore parameter passed in by maskrom/vendor firmware. */ ldr r0, =maskrom_param str r10, [r0] - /* Set stackpointer in internal RAM to call bootblock main() */ - ldr sp, =_estack ldr r0,=0x00000000 /* * The current design of cpu_info places the struct at the top of the |