diff options
| author | Aaron Durbin <adurbin@chromium.org> | 2014-08-27 15:52:01 -0500 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-03-27 08:04:08 +0100 |
| commit | 3a0013dcde04d197aed2b162c5359ad11ff37536 (patch) | |
| tree | 7b133f8b27287576fe9b7cbd8740a175147dcf8f /src/arch/arm64 | |
| parent | 30f08ff094a6d36ade1cdeb53ce6062852bed910 (diff) | |
arm64: add indirection to C entry point
To allow setting the entry point for the secondary CPUs
provide a pointer, c_entry, which contains the location
to branch to after setting up the stack.
BUG=chrome-os-partner:31545
BRANCH=None
TEST=Built and booted to the kernel on ryu.
Change-Id: I03e54b081aa5ff70b90fbd7f1b243fdb4f42c5a6
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: f692c5814ea5c7ff4895576e1db8361ff3b7d9fb
Original-Change-Id: Ic2f6c79cde708b24c379345aed1e2cc0760ccad8
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/214771
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/9015
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/arch/arm64')
| -rw-r--r-- | src/arch/arm64/c_entry.c | 8 | ||||
| -rw-r--r-- | src/arch/arm64/stage_entry.S | 8 |
2 files changed, 15 insertions, 1 deletions
diff --git a/src/arch/arm64/c_entry.c b/src/arch/arm64/c_entry.c index f08a5853f4..3e9d44e4af 100644 --- a/src/arch/arm64/c_entry.c +++ b/src/arch/arm64/c_entry.c @@ -20,6 +20,14 @@ #include <arch/stages.h> #include <arch/cpu.h> + +/* + * This variable holds entry point for CPUs starting up. Before the other + * CPUs are brought up this value will change to provide the secondary + * code path. + */ +void (*c_entry)(void) = &arm64_init; + void __attribute__((weak)) arm64_soc_init(void) { /* Default weak implementation does nothing. */ diff --git a/src/arch/arm64/stage_entry.S b/src/arch/arm64/stage_entry.S index 86136555dc..e323de5d96 100644 --- a/src/arch/arm64/stage_entry.S +++ b/src/arch/arm64/stage_entry.S @@ -99,7 +99,13 @@ ENTRY(arm64_c_environment) bl cpu_get_stack mov sp, x0 - b arm64_init + /* Get entry point by dereferencing c_entry. */ + ldr x0, 1f + ldr x0, [x0] + br x0 +.align 3 + 1: + .quad c_entry ENDPROC(arm64_c_environment) CPU_RESET_ENTRY(arm64_cpu_startup) |