armv8: Support loading 32-bit OS in AArch32 execution state
To support loading a 32-bit OS, the execution state will change from
AArch64 to AArch32 when jumping to kernel.
The architecture information will be got through checking FIT image,
then U-Boot will load 32-bit OS or 64-bit OS automatically.
Signed-off-by: Ebony Zhu <ebony.zhu@nxp.com>
Signed-off-by: Alison Wang <alison.wang@nxp.com>
Signed-off-by: Chenhui Zhao <chenhui.zhao@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S b/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S
index f7b49cb..72f2c11 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S
+++ b/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S
@@ -17,6 +17,7 @@
#include <asm/arch-fsl-layerscape/immap_lsch3.h>
#include <asm/arch-fsl-layerscape/soc.h>
#endif
+#include <asm/u-boot.h>
ENTRY(lowlevel_init)
mov x29, lr /* Save LR */
@@ -359,11 +360,6 @@
gic_wait_for_interrupt_m x0, w1
#endif
- bl secondary_switch_to_el2
-#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
- bl secondary_switch_to_el1
-#endif
-
slave_cpu:
wfe
ldr x0, [x11]
@@ -376,19 +372,64 @@
tbz x1, #25, cpu_is_le
rev x0, x0 /* BE to LE conversion */
cpu_is_le:
- br x0 /* branch to the given address */
+ ldr x5, [x11, #24]
+ ldr x6, =IH_ARCH_DEFAULT
+ cmp x6, x5
+ b.eq 1f
+
+#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
+ adr x3, secondary_switch_to_el1
+ ldr x4, =ES_TO_AARCH64
+#else
+ ldr x3, [x11]
+ ldr x4, =ES_TO_AARCH32
+#endif
+ bl secondary_switch_to_el2
+
+1:
+#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
+ adr x3, secondary_switch_to_el1
+#else
+ ldr x3, [x11]
+#endif
+ ldr x4, =ES_TO_AARCH64
+ bl secondary_switch_to_el2
+
ENDPROC(secondary_boot_func)
ENTRY(secondary_switch_to_el2)
- switch_el x0, 1f, 0f, 0f
+ switch_el x5, 1f, 0f, 0f
0: ret
-1: armv8_switch_to_el2_m x0
+1: armv8_switch_to_el2_m x3, x4, x5
ENDPROC(secondary_switch_to_el2)
ENTRY(secondary_switch_to_el1)
- switch_el x0, 0f, 1f, 0f
+ mrs x0, mpidr_el1
+ ubfm x1, x0, #8, #15
+ ubfm x2, x0, #0, #1
+ orr x10, x2, x1, lsl #2 /* x10 has LPID */
+
+ lsl x1, x10, #6
+ ldr x0, =__spin_table
+ /* physical address of this cpus spin table element */
+ add x11, x1, x0
+
+ ldr x3, [x11]
+
+ ldr x5, [x11, #24]
+ ldr x6, =IH_ARCH_DEFAULT
+ cmp x6, x5
+ b.eq 2f
+
+ ldr x4, =ES_TO_AARCH32
+ bl switch_to_el1
+
+2: ldr x4, =ES_TO_AARCH64
+
+switch_to_el1:
+ switch_el x5, 0f, 1f, 0f
0: ret
-1: armv8_switch_to_el1_m x0, x1
+1: armv8_switch_to_el1_m x3, x4, x5
ENDPROC(secondary_switch_to_el1)
/* Ensure that the literals used by the secondary boot code are
diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S
index 19c771d..4f5f6d8 100644
--- a/arch/arm/cpu/armv8/start.S
+++ b/arch/arm/cpu/armv8/start.S
@@ -251,9 +251,17 @@
/*
* All slaves will enter EL2 and optionally EL1.
*/
+ adr x3, lowlevel_in_el2
+ ldr x4, =ES_TO_AARCH64
bl armv8_switch_to_el2
+
+lowlevel_in_el2:
#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
+ adr x3, lowlevel_in_el1
+ ldr x4, =ES_TO_AARCH64
bl armv8_switch_to_el1
+
+lowlevel_in_el1:
#endif
#endif /* CONFIG_ARMV8_MULTIENTRY */
diff --git a/arch/arm/cpu/armv8/transition.S b/arch/arm/cpu/armv8/transition.S
index 253a39b..bbccf2b 100644
--- a/arch/arm/cpu/armv8/transition.S
+++ b/arch/arm/cpu/armv8/transition.S
@@ -11,13 +11,24 @@
#include <asm/macro.h>
ENTRY(armv8_switch_to_el2)
- switch_el x0, 1f, 0f, 0f
-0: ret
-1: armv8_switch_to_el2_m x0
+ switch_el x5, 1f, 0f, 0f
+0:
+ /*
+ * x3 is kernel entry point or switch_to_el1
+ * if CONFIG_ARMV8_SWITCH_TO_EL1 is defined.
+ * When running in EL2 now, jump to the
+ * address saved in x3.
+ */
+ br x3
+1: armv8_switch_to_el2_m x3, x4, x5
ENDPROC(armv8_switch_to_el2)
ENTRY(armv8_switch_to_el1)
- switch_el x0, 0f, 1f, 0f
-0: ret
-1: armv8_switch_to_el1_m x0, x1
+ switch_el x5, 0f, 1f, 0f
+0:
+ /* x3 is kernel entry point. When running in EL1
+ * now, jump to the address saved in x3.
+ */
+ br x3
+1: armv8_switch_to_el1_m x3, x4, x5
ENDPROC(armv8_switch_to_el1)