riscv64/smp: Implement multi-processor support

* Working under qemu smp 1,2+
* Working on SiFive Unmatched
* x86_64 efi not broken by smp_boot_other_cpus change

Change-Id: I32ebc17913e46ed082be9ade8f56448bbf12f16e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4705
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: Alex von Gluck IV <[email protected]>

headers/private/kernel/boot/platform/efi/arch_smp.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2019 Haiku, Inc. All rights reserved.
+ * Copyright 2013-2021 Haiku, Inc. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef KERNEL_BOOT_PLATFORM_EFI_ARCH_SMP_H
@@ -13,9 +13,17 @@
 // These platforms take inventory of cpu cores from fdt
 
 struct platform_cpu_info {
-	uint32 id;
+	uint32 id; // hart id on riscv
+#if defined(__riscv)
+	uint32 phandle;
+	uint32 plicContext;
+#endif
 };
 
+#if defined(__riscv)
+extern uint32 gBootHart;
+#endif
+
 void arch_smp_register_cpu(platform_cpu_info** cpu);
 #endif
 
@@ -23,6 +31,7 @@ void arch_smp_register_cpu(platform_cpu_info** cpu);
 int arch_smp_get_current_cpu(void);
 void arch_smp_init_other_cpus(void);
 #ifdef __riscv
+platform_cpu_info* arch_smp_find_cpu(uint32 phandle);
 void arch_smp_boot_other_cpus(uint64 satp, uint64 kernel_entry);
 #else
 void arch_smp_boot_other_cpus(uint32 pml4, uint64 kernel_entry);