diff options
Diffstat (limited to 'src/arch/arm/armv7')
| -rw-r--r-- | src/arch/arm/armv7/bootblock.S | 23 | ||||
| -rw-r--r-- | src/arch/arm/armv7/cpu.S | 4 |
2 files changed, 25 insertions, 2 deletions
diff --git a/src/arch/arm/armv7/bootblock.S b/src/arch/arm/armv7/bootblock.S index b468e15c98..57d72d0109 100644 --- a/src/arch/arm/armv7/bootblock.S +++ b/src/arch/arm/armv7/bootblock.S @@ -32,6 +32,16 @@ #include <arch/asm.h> .arm + /* + * Just in case the maskrom or the vendor basic firmware passes on a + * parameter when calling the bootblock, store it here for handling by C + * code. + */ + .section .bss, "aw" @nobits + .global maskrom_param +maskrom_param: + .word 0 + ENTRY(_start) /* * Set the cpu to System mode with IRQ and FIQ disabled. Prefetch/Data @@ -45,6 +55,10 @@ ENDPROC(_start) .thumb ENTRY(_thumb_start) + + /* Preserve the maskrom passed value, if any */ + mov r10, r0 + bl arm_init_caches /* @@ -71,9 +85,14 @@ init_stack_loop: cmp r0, r1 bne init_stack_loop -/* Set stackpointer in internal RAM to call bootblock main() */ call_bootblock: - ldr sp, =_estack /* Set up stack pointer */ + + /* 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 diff --git a/src/arch/arm/armv7/cpu.S b/src/arch/arm/armv7/cpu.S index b7f245b85d..6c00f62582 100644 --- a/src/arch/arm/armv7/cpu.S +++ b/src/arch/arm/armv7/cpu.S @@ -43,6 +43,8 @@ * through the magic of double subtraction. It's quite ingenius, really. * Takes care to only use r0-r3 and ip so it's pefectly ABI-compatible without * needing to write to memory. + * + * THIS FUNCTION MUST PRESERVE THE VALUE OF r10 */ .macro dcache_apply_all crm @@ -109,6 +111,8 @@ * known state regarding caches/SCTLR. Completely cleans and invalidates * icache/dcache, disables MMU and dcache (if active), and enables unaligned * accesses, icache and branch prediction (if inactive). Clobbers r4 and r5. + * + * THIS FUNCTION MUST PRESERVE THE VALUE OF r10 */ ENTRY(arm_init_caches) /* r4: SCTLR, return address: r5 (stay valid for the whole function) */ |