[PATCH v2 12/13] armv8: layerscape: relocate spin table if EFI_LOADER is enabled

[Michael Walle]

On ARM64, a 64kb region is reserved for the runtime services code.
Unfortunately, this code overlaps with the spin table code, which also
needs to be reserved. Thus now that the code is relocatable, allocate a
new page from EFI, copy the spin table code into it, update any pointers
to the old region and the start the secondary CPUs.

Signed-off-by: Michael Walle <michael at walle.cc>
---
 arch/arm/cpu/armv8/fsl-layerscape/mp.c | 36 ++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/mp.c b/arch/arm/cpu/armv8/fsl-layerscape/mp.c
index d50c5a437b..bd85351705 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/mp.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/mp.c
@@ -79,6 +79,10 @@ int fsl_layerscape_wake_seconday_cores(void)
 	u32 cores, cpu_up_mask = 1;
 	int i, timeout = 10;
 	u64 *table;
+#ifdef CONFIG_EFI_LOADER
+	u64 reloc_addr = U32_MAX;
+	efi_status_t ret;
+#endif
 
 #ifdef COUNTER_FREQUENCY_REAL
 	/* update for secondary cores */
@@ -87,6 +91,38 @@ int fsl_layerscape_wake_seconday_cores(void)
 			   (unsigned long)&__real_cntfrq + 8);
 #endif
 
+#ifdef CONFIG_EFI_LOADER
+	/*
+	 * EFI will reserve 64kb for its runtime services. This will probably
+	 * overlap with our spin table code, which is why we have to relocate
+	 * it.
+	 * Keep this after the __real_cntfrq update, so we have it when we
+	 * copy the complete section here.
+	 */
+	ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
+				 EFI_RESERVED_MEMORY_TYPE,
+				 efi_size_in_pages(secondary_boot_code_size),
+				 &reloc_addr);
+	if (ret == EFI_SUCCESS) {
+		debug("Relocating spin table from %llx to %llx (size %lx)\n",
+		      (u64)secondary_boot_code_start, reloc_addr,
+		      secondary_boot_code_size);
+		memcpy((void *)reloc_addr, secondary_boot_code_start,
+		       secondary_boot_code_size);
+		flush_dcache_range(reloc_addr,
+				   reloc_addr + secondary_boot_code_size);
+
+		/* set new entry point for secondary cores */
+		secondary_boot_addr += (void *)reloc_addr -
+				       secondary_boot_code_start;
+		flush_dcache_range((unsigned long)&secondary_boot_addr,
+				   (unsigned long)&secondary_boot_addr + 8);
+
+		/* this will be used to reserve the memory */
+		secondary_boot_code_start = (void *)reloc_addr;
+	}
+#endif
+
 	cores = cpu_mask();
 	/* Clear spin table so that secondary processors
 	 * observe the correct value after waking up from wfe.
-- 
2.20.1