kernel/arch/platform: implement for riscv64

Change-Id: Id1839ef39d927e6a2017c8b8ac3482d9eeb00fa1
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4059
Reviewed-by: Alex von Gluck IV <[email protected]>

headers/private/kernel/arch/riscv64/arch_kernel_args.h

@@ -19,19 +19,11 @@
 
 
 enum {
-	kPlatform1None,
-	kPlatform1Riscv,
-	kPlatform1Sbi,
+	kPlatformNone,
+	kPlatformMNative,
+	kPlatformSbi,
 };
 
-enum {
-	kPlatform2None,
-	kPlatform2Riscv,
-	kPlatform2Efi,
-	kPlatform2UBoot,
-};
-
-
 enum {
 	kUartKindNone,
 	kUartKind8250,
@@ -57,8 +49,8 @@ typedef struct {
 	uint32		num_virtual_ranges_to_keep;
 	addr_range	virtual_ranges_to_keep[MAX_VIRTUAL_RANGES_TO_KEEP];
 
-	uint32 platform1;
-	uint32 platform2;
+	// MNative hooks, or SBI
+	uint32 machine_platform;
 
 	uint bootHart;
 	uint64 timerFrequrency; // in Hz

src/system/boot/platform/efi/arch/riscv64/arch_start.cpp

@@ -37,9 +37,8 @@ extern uint64_t arch_mmu_generate_post_efi_page_tables(size_t memory_map_size,
 void
 arch_start_kernel(addr_t kernelEntry)
 {
-	// Set RV64 platform information
-	gKernelArgs.arch_args.platform1 = kPlatform1Sbi;
-	gKernelArgs.arch_args.platform2 = kPlatform2Efi;
+	// EFI assumed to be SBI booted
+	gKernelArgs.arch_args.machine_platform = kPlatformSbi;
 
 	// Prepare to exit EFI boot services.
 	// Read the memory map.

src/system/kernel/arch/riscv64/arch_cpu.cpp

@@ -15,8 +15,7 @@
 #include <platform/sbi/sbi_syscalls.h>
 
 
-extern uint32 gPlatform1;
-extern uint32 gPlatform2;
+extern uint32 gPlatform;
 
 
 status_t
@@ -113,7 +112,7 @@ arch_cpu_user_TLB_invalidate(void)
 status_t
 arch_cpu_shutdown(bool reboot)
 {
-	if (gPlatform1 == kPlatform1Sbi) {
+	if (gPlatform == kPlatformSbi) {
 		sbi_system_reset(
 			reboot ? SBI_RESET_TYPE_COLD_REBOOT : SBI_RESET_TYPE_SHUTDOWN,
 			SBI_RESET_REASON_NONE);

src/system/kernel/arch/riscv64/arch_platform.cpp

@@ -4,11 +4,48 @@
 
 
 #include <arch/platform.h>
+#include <boot/kernel_args.h>
+#include <Htif.h>
+#include <Plic.h>
+#include <Clint.h>
+#include <platform/sbi/sbi_syscalls.h>
+
+#include <debug.h>
+
+
+uint32 gPlatform;
+
+void* gFDT = NULL;
+
+HtifRegs  *volatile gHtifRegs  = (HtifRegs *volatile)0x40008000;
+PlicRegs  *volatile gPlicRegs;
+ClintRegs *volatile gClintRegs;
 
 
 status_t
-arch_platform_init(struct kernel_args *kernelArgs)
+arch_platform_init(struct kernel_args *args)
 {
+	gPlatform = args->arch_args.machine_platform;
+
+	debug_early_boot_message("machine_platform: ");
+	switch (gPlatform) {
+		case kPlatformMNative:
+			debug_early_boot_message("Native mmode hooks\n");
+			break;
+		case kPlatformSbi:
+			debug_early_boot_message("SBI\n");
+			break;
+		default:
+			debug_early_boot_message("?\n");
+			break;
+	}
+
+	gFDT = args->arch_args.fdt;
+
+	gHtifRegs  = (HtifRegs *volatile)args->arch_args.htif.start;
+	gPlicRegs  = (PlicRegs *volatile)args->arch_args.plic.start;
+	gClintRegs = (ClintRegs *volatile)args->arch_args.clint.start;
+
 	return B_OK;
 }
 
@@ -16,6 +53,19 @@ arch_platform_init(struct kernel_args *kernelArgs)
 status_t
 arch_platform_init_post_vm(struct kernel_args *kernelArgs)
 {
+	if (gPlatform == kPlatformSbi) {
+		sbiret res;
+		res = sbi_get_spec_version();
+		dprintf("SBI spec version: %#lx\n", res.value);
+		res = sbi_get_impl_id();
+		dprintf("SBI implementation ID: %#lx\n", res.value);
+		res = sbi_get_impl_version();
+		dprintf("SBI implementation version: %#lx\n", res.value);
+		res = sbi_get_mvendorid();
+		dprintf("SBI vendor ID: %#lx\n", res.value);
+		res = sbi_get_marchid();
+		dprintf("SBI arch ID: %#lx\n", res.value);
+	}
 	return B_OK;
 }
 

src/system/kernel/arch/riscv64/arch_timer.cpp

@@ -18,20 +18,19 @@
 #include <Clint.h>
 
 
-extern uint32 gPlatform1;
-extern uint32 gPlatform2;
+extern uint32 gPlatform;
 
 
 void
 arch_timer_set_hardware_timer(bigtime_t timeout)
 {
 	// TODO: Read timer frequency from FDT
-	switch (gPlatform1) {
-		case kPlatform1Riscv:
+	switch (gPlatform) {
+		case kPlatformMNative:
 			MSyscall(kMSyscallSetTimer, true,
 				gClintRegs->mtime + timeout * 10);
 			break;
-		case kPlatform1Sbi: {
+		case kPlatformSbi: {
 			sbi_set_timer(CpuTime() + timeout);
 			break;
 		}
@@ -44,11 +43,11 @@ arch_timer_set_hardware_timer(bigtime_t timeout)
 void
 arch_timer_clear_hardware_timer()
 {
-	switch (gPlatform1) {
-		case kPlatform1Riscv:
+	switch (gPlatform) {
+		case kPlatformMNative:
 			MSyscall(kMSyscallSetTimer, false);
 			break;
-		case kPlatform1Sbi: {
+		case kPlatformSbi: {
 			sbi_set_timer(CpuTime() + (uint64)10000000 * 3600);
 			break;
 		}