diff options
Diffstat (limited to 'OvmfPkg/LoongArchVirt/Sec/LoongArch64/Start.S')
| -rw-r--r-- | OvmfPkg/LoongArchVirt/Sec/LoongArch64/Start.S | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/OvmfPkg/LoongArchVirt/Sec/LoongArch64/Start.S b/OvmfPkg/LoongArchVirt/Sec/LoongArch64/Start.S new file mode 100644 index 0000000..dd74c6b --- /dev/null +++ b/OvmfPkg/LoongArchVirt/Sec/LoongArch64/Start.S @@ -0,0 +1,184 @@ +#------------------------------------------------------------------------------
+#
+# Start for Loongson LoongArch processor
+#
+# Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+# @par Glossary:
+# - CSR - CPU Status Register
+# - EBASE - Exception Base Address
+#------------------------------------------------------------------------------
+#ifndef __ASSEMBLY__
+#define __ASSEMBLY__
+#endif
+
+#include <Library/BaseMemoryLib.h>
+#include <Register/LoongArch64/Csr.h>
+#include <Protocol/DebugSupport.h>
+
+#define BOOTCORE_ID 0
+//
+// For coding convenience, define the maximum valid
+// LoongArch exception.
+// Since UEFI V2.11, it will be present in DebugSupport.h.
+//
+#define MAX_LOONGARCH_EXCEPTION 64
+
+ASM_GLOBAL ASM_PFX(_ModuleEntryPoint)
+ASM_PFX(_ModuleEntryPoint):
+ /* Disable global interrupt */
+ bl DisableInterrupts
+
+ /* Disable all local interrupt */
+ li.w $a0, 0x1FFF
+ bl DisableLocalInterrupts
+
+ /* Read physical cpu number id */
+ bl GetApicId
+ li.d $t0, BOOTCORE_ID //0
+ bne $a0, $t0, SlaveMain
+
+ /* Set BSP stack */
+ li.d $t0, FixedPcdGet64(PcdOvmfSecPeiTempRamBase) + FixedPcdGet32(PcdOvmfSecPeiTempRamSize) # stack base
+ move $sp, $t0
+ addi.d $sp, $sp, -0x8
+
+ /* Load the exception vector base address */
+ li.d $s0, FixedPcdGet64(PcdLoongArchExceptionVectorBaseAddress)
+
+ /* Construct SEC and PEI step exception environment */
+ la.pcrel $a1, ExceptionEntryStart
+ la.pcrel $t0, ExceptionEntryEnd
+ sub.d $a2, $t0, $a1
+ li.w $t0, (MAX_LOONGARCH_EXCEPTION + MAX_LOONGARCH_INTERRUPT) * 512
+ bgeu $a2, $t0, DeadLoop
+ move $a0, $s0
+ bl CopyMem
+
+ /* Configure BSP reset ebase */
+ move $a0, $s0
+ bl SetExceptionBaseAddress
+
+CallEntry:
+ /* Call C function make sure parameter true */
+ li.d $a0, FixedPcdGet64(PcdOvmfFdBaseAddress) # FW base
+ addi.d $a1, $sp, 0x8
+ bl SecCoreStartupWithStack
+# End of _ModuleEntryPoint
+
+ASM_PFX(ClearMailBox):
+ /* Clear mailbox */
+ li.d $t1, LOONGARCH_IOCSR_MBUF3
+ iocsrwr.d $zero, $t1
+ li.d $t1, LOONGARCH_IOCSR_MBUF2
+ iocsrwr.d $zero, $t1
+ li.d $t1, LOONGARCH_IOCSR_MBUF1
+ iocsrwr.d $zero, $t1
+ li.d $t1, LOONGARCH_IOCSR_MBUF0
+ iocsrwr.d $zero, $t1
+ jirl $zero, $ra, 0
+# End of ClearMailBox
+
+ASM_PFX(EnableIPI):
+ /* Enable IPI interrupt */
+ li.w $t1, BIT12
+ csrxchg $t1, $t1, LOONGARCH_CSR_ECFG
+
+ li.w $t2, 0xFFFFFFFFU
+ li.d $t1, LOONGARCH_IOCSR_IPI_EN
+ iocsrwr.w $t2, $t1
+ jirl $zero, $ra, 0
+# End of EeableIPI
+
+#/**
+# Get APIC ID for every CPU.
+#
+# @param NULL
+# @return APICID
+#
+# UINTN
+# EFI_API
+# GetApicId (
+# VOID
+# )
+#**/
+ASM_PFX(GetApicId):
+ csrrd $a0, LOONGARCH_CSR_CPUNUM
+ andi $a0, $a0, 0x3ff
+ jirl $zero, $ra, 0
+# End of GetApicId
+
+ASM_PFX(ApInitStack):
+ li.d $t1, SIZE_1KB
+ csrrd $t0, LOONGARCH_CSR_TMID
+ mul.d $t1, $t0, $t1
+ li.d $t2, FixedPcdGet32(PcdCpuMaxLogicalProcessorNumber)
+ bgeu $t0, $t2, DeadLoop
+ li.d $t0, FixedPcdGet64(PcdOvmfSecPeiTempRamBase) + FixedPcdGet32(PcdOvmfSecPeiTempRamSize) - SIZE_64KB
+ sub.d $sp, $t0, $t1
+ addi.d $sp, $sp, -0x8
+ jirl $zero, $ra, 0
+# End of ApInitStack
+
+ASM_PFX(SlaveMain):
+ /* Set AP exception handle in flash */
+ la.pcrel $a0, ApException
+ bl SetExceptionBaseAddress
+
+ /* Clean up local mail box and open INT */
+ bl ClearMailBox
+ bl EnableIPI
+ bl EnableInterrupts
+
+WaitForWake:
+ /* Wait for wakeup */
+ bl CpuSleep
+ b WaitForWake
+# End of SlaveMain
+
+.align 12
+ASM_PFX(ApException):
+ csrrd $t0, LOONGARCH_CSR_ESTAT
+ srli.d $t0, $t0, 12
+ andi $t0, $t0, 0x1
+ beqz $t0, DeadLoop
+
+ li.d $t0, LOONGARCH_IOCSR_IPI_STATUS
+ iocsrrd.w $t1, $t0
+ li.d $t0, LOONGARCH_IOCSR_IPI_CLEAR
+ iocsrwr.w $t1, $t0
+
+ /* Read mail buf and jump to specified entry */
+ li.d $t1, LOONGARCH_IOCSR_MBUF0
+ iocsrrd.d $t0, $t1
+ beqz $t0, OutOfException
+ csrwr $t0, LOONGARCH_CSR_ERA
+ li.d $t0, LOONGARCH_IOCSR_MBUF3
+ iocsrrd.d $a1, $t0
+ bl ClearMailBox
+ beqz $a1, NoParameterCall
+
+ //
+ // If the parameters are not NULL, then calling happened in FW ENV.
+ // Set the EBASE to be the same as BSP.
+ //
+ li.d $a0, FixedPcdGet64(PcdLoongArchExceptionVectorBaseAddress)
+ bl SetExceptionBaseAddress
+
+ bl ApInitStack
+ bl GetApicId
+ b OutOfException
+NoParameterCall:
+ li.w $t0, BIT2 // IE
+ csrxchg $zero, $t0, LOONGARCH_CSR_PRMD // Clean PIE
+
+OutOfException:
+ ertn
+# End of ApException
+
+ASM_PFX(DeadLoop):
+ b DeadLoop
+# End of DeadLoop
+.end
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