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authorAaron Durbin <adurbin@chromium.org>2014-09-18 13:48:49 -0500
committerPatrick Georgi <pgeorgi@google.com>2015-03-28 07:05:35 +0100
commitdee1996d6c3b4006f4e1d93ab1ffbcb98e30800f (patch)
tree44c348c2a3ebab967142f742414dea5b2d7b6d1b /src
parentb30c9b1c9a676c3b85ac1de9cbc1c5f4424d6297 (diff)
downloadcoreboot-dee1996d6c3b4006f4e1d93ab1ffbcb98e30800f.tar.xz
arm64: provide entry points for BSP and non-BSP
It's helpful to differentiate the startup paths for the BSP and the non-BSP. Therefore have c_entry be an 2 element array of function pointers. The non-BSP paths have an entry point one instruction after stage/module entry. BUG=chrome-os-partner:30785 BRANCH=None TEST=Built and booted to kernel. Change-Id: I40bb40462906f1b1eaf2db8584985095e8ac0bae Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: ce10f954041b3fd581ad8a3d82dee567b68637fe Original-Change-Id: Ia573b1095dca5f69e371bf1ddf6b6df72fa3b52e Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/218844 Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org> Reviewed-on: http://review.coreboot.org/9090 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src')
-rw-r--r--src/arch/arm64/c_entry.c21
-rw-r--r--src/arch/arm64/include/arch/stages.h18
-rw-r--r--src/arch/arm64/stage_entry.S32
3 files changed, 51 insertions, 20 deletions
diff --git a/src/arch/arm64/c_entry.c b/src/arch/arm64/c_entry.c
index f4a9848ee1..5e3dfe871d 100644
--- a/src/arch/arm64/c_entry.c
+++ b/src/arch/arm64/c_entry.c
@@ -24,13 +24,6 @@
#include <arch/stages.h>
#include "cpu-internal.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. */
@@ -54,7 +47,7 @@ static void seed_stack(void)
*slot++ = 0xdeadbeefdeadbeefULL;
}
-void arm64_init(void)
+static void arm64_init(void)
{
cpu_set_bsp();
seed_stack();
@@ -71,11 +64,15 @@ static void secondary_cpu_start(void)
arch_secondary_cpu_init();
}
+/*
+ * This variable holds entry point for CPUs starting up. The first
+ * element is the BSP path, and the second is the non-BSP path.
+ */
+void (*c_entry[2])(void) = { &arm64_init, &secondary_cpu_start };
+
extern void arm64_cpu_startup(void);
+
void *prepare_secondary_cpu_startup(void)
{
- c_entry = &secondary_cpu_start;
- dcache_clean_invalidate_by_mva(c_entry, sizeof(c_entry));
-
- return &arm64_cpu_startup;
+ return secondary_entry_point(&arm64_cpu_startup);
}
diff --git a/src/arch/arm64/include/arch/stages.h b/src/arch/arm64/include/arch/stages.h
index 97714926eb..fd633e484f 100644
--- a/src/arch/arm64/include/arch/stages.h
+++ b/src/arch/arm64/include/arch/stages.h
@@ -20,18 +20,30 @@
#ifndef __ARCH_STAGES_H
#define __ARCH_STAGES_H
+#include <stdint.h>
+
extern void main(void);
void stage_entry(void);
void stage_exit(void *);
void jmp_to_elf_entry(void *entry, unsigned long buffer, unsigned long size);
-/* C entry point for all arm64 stages. */
-void arm64_init(void);
-
/* This function is called upon initial entry of each stage. It is called prior
* to main(). That means all of the common infrastructure will most likely not
* be available to be used (such as console). */
void arm64_soc_init(void);
+/*
+ * Stages and rmodules have 2 entry points: BSP and non-BSP. Provided
+ * a pointer the correct non-BSP entry point will be returned. The
+ * first instruction is for BSP and the 2nd is for non-BSP. Instructions
+ * are all 32-bit on arm64.
+ */
+static inline void *secondary_entry_point(void *e)
+{
+ uintptr_t nonbsp = (uintptr_t)e;
+
+ return (void *)(nonbsp + sizeof(uint32_t));
+}
+
#endif
diff --git a/src/arch/arm64/stage_entry.S b/src/arch/arm64/stage_entry.S
index 6b8ca7b424..5a5ddabb51 100644
--- a/src/arch/arm64/stage_entry.S
+++ b/src/arch/arm64/stage_entry.S
@@ -105,6 +105,8 @@ ENTRY(arm64_c_environment)
/* Get entry point by dereferencing c_entry. */
ldr x1, 1f
+ /* Retrieve entry in c_entry array using x26 as the index. */
+ adds x1, x1, x26, lsl #3
ldr x1, [x1]
/* Move back the arguments from x25 to x0 */
mov x0, x25
@@ -114,14 +116,28 @@ ENTRY(arm64_c_environment)
.quad c_entry
ENDPROC(arm64_c_environment)
+/* The first 2 instructions are for BSP and secondary CPUs,
+ * respectively. x26 holds the index into c_entry array. */
+.macro split_bsp_path
+ b 2000f
+ b 2001f
+ 2000:
+ mov x26, #0
+ b 2002f
+ 2001:
+ mov x26, #1
+ 2002:
+.endm
+
ENTRY(__rmodule_entry)
+ split_bsp_path
/* Save the arguments to secmon in x25 */
- mov x25, x0
- b arm64_c_environment
+ mov x25, x0
+ b arm64_c_environment
ENDPROC(__rmodule_entry)
-CPU_RESET_ENTRY(arm64_cpu_startup)
- read_current x0, sctlr
+ENTRY(_arm64_cpu_startup)
+ read_current x0, sctlr
bic x0, x0, #(1 << 25) /* Little Endian */
bic x0, x0, #(1 << 19) /* XN not enforced */
bic x0, x0, #(1 << 12) /* Disable Instruction Cache */
@@ -129,8 +145,14 @@ CPU_RESET_ENTRY(arm64_cpu_startup)
write_current sctlr, x0, x1
isb
b arm64_c_environment
+ENDPROC(_arm64_cpu_startup)
+
+CPU_RESET_ENTRY(arm64_cpu_startup)
+ split_bsp_path
+ b _arm64_cpu_startup
ENDPROC(arm64_cpu_startup)
ENTRY(stage_entry)
- b arm64_cpu_startup
+ split_bsp_path
+ b _arm64_cpu_startup
ENDPROC(stage_entry)