There are two issues:
(1) The spin table doesn't convert the endianness of the jump address. Although there is code for it, the result isn't used at all (x0). (2) If something goes wrong, the function returns. But that doesn't make sense at all.
Use the actual converted jump address as destination to fix. If there is an error, jump to a trap loop. And rearrange the code exception level switching code to make it smaller and clearer.
This reduces the size of the spin table code section from 696 bytes to 424 bytes. If CONFIG_ARMV8_SWITCH_TO_EL1 the code size reduced from 696 bytes to 632 bytes.
Signed-off-by: Michael Walle michael@walle.cc --- arch/arm/cpu/armv8/fsl-layerscape/spintable.S | 83 +++++-------------- 1 file changed, 23 insertions(+), 60 deletions(-)
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/spintable.S b/arch/arm/cpu/armv8/fsl-layerscape/spintable.S index f082e10231..363ded03e6 100644 --- a/arch/arm/cpu/armv8/fsl-layerscape/spintable.S +++ b/arch/arm/cpu/armv8/fsl-layerscape/spintable.S @@ -31,7 +31,7 @@ __spin_table: .space CONFIG_MAX_CPUS*SPIN_TABLE_ELEM_SIZE
.align 2 -ENTRY(__secondary_boot_func) +__secondary_boot_func: /* * MPIDR_EL1 Fields: * MPIDR[1:0] = AFF0_CPUID <- Core ID (0,1) @@ -72,73 +72,36 @@ ENTRY(__secondary_boot_func) str x4, [x11, #8] /* STATUS */ dsb sy
-slave_cpu: +1: wfe - ldr x0, [x11] - cbz x0, slave_cpu -#ifndef CONFIG_ARMV8_SWITCH_TO_EL1 + ldr x4, [x11] + cbz x4, 1b mrs x1, sctlr_el2 -#else - mrs x1, sctlr_el1 -#endif - tbz x1, #25, cpu_is_le - rev x0, x0 /* BE to LE conversion */ -cpu_is_le: - ldr x5, [x11, #24] - cbz x5, 1f - + tbz x1, #25, 2f + rev x4, x4 /* BE to LE conversion */ +2: + ldr x6, =ES_TO_AARCH64 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1 - adr x4, secondary_switch_to_el1 - ldr x5, =ES_TO_AARCH64 -#else - ldr x4, [x11] - ldr x5, =ES_TO_AARCH32 + adr x5, 3f + switch_el x7, 0f, _dead_loop, _dead_loop +0: armv8_switch_to_el2_m x5, x6, x7 #endif - bl secondary_switch_to_el2 - -1: +3: + ldr x7, [x11, #24] /* ARCH_COMP */ + cbz x7, 4f + ldr x6, =ES_TO_AARCH32 +4: #ifdef CONFIG_ARMV8_SWITCH_TO_EL1 - adr x4, secondary_switch_to_el1 + switch_el x7, _dead_loop, 0f, _dead_loop +0: armv8_switch_to_el1_m x4, x6, x7 #else - ldr x4, [x11] + switch_el x7, 0f, _dead_loop, _dead_loop +0: armv8_switch_to_el2_m x4, x6, x7 #endif - ldr x5, =ES_TO_AARCH64 - bl secondary_switch_to_el2 - -ENDPROC(__secondary_boot_func) - -ENTRY(secondary_switch_to_el2) - switch_el x6, 1f, 0f, 0f -0: ret -1: armv8_switch_to_el2_m x4, x5, x6 -ENDPROC(secondary_switch_to_el2) - -ENTRY(secondary_switch_to_el1) - 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 - adr x0, __spin_table - /* physical address of this cpus spin table element */ - add x11, x1, x0 - - ldr x4, [x11] - - ldr x5, [x11, #24] - cbz x5, 2f
- ldr x5, =ES_TO_AARCH32 - bl switch_to_el1 - -2: ldr x5, =ES_TO_AARCH64 - -switch_to_el1: - switch_el x6, 0f, 1f, 0f -0: ret -1: armv8_switch_to_el1_m x4, x5, x6 -ENDPROC(secondary_switch_to_el1) +_dead_loop: + wfe + b _dead_loop
/* Ensure that the literals used by the secondary boot code are * assembled within it (this is required so that we can protect